function AST_Accessor(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
function AST_Array(props){ if (props) { this.end = props.end;this.start = props.start;this.elements = props.elements;}}n/a
function AST_Assign(props){ if (props) { this.end = props.end;this.start = props.start;this.right = props.right;this.operator =
props.operator;this.left = props.left;}}n/a
function AST_Atom(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Binary(props){ if (props) { this.end = props.end;this.start = props.start;this.right = props.right;this.operator =
props.operator;this.left = props.left;}}n/a
function AST_Block(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_BlockStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Boolean(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Break(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}n/a
function AST_Call(props){ if (props) { this.end = props.end;this.start = props.start;this.args = props.args;this.expression = props
.expression;}}n/a
function AST_Case(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.expression = props
.expression;}}n/a
function AST_Catch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.argname = props
.argname;}}n/a
function AST_Conditional(props){ if (props) { this.end = props.end;this.start = props.start;this.alternative = props.alternative
;this.consequent = props.consequent;this.condition = props.condition;}}n/a
function AST_Const(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions;}}n/a
function AST_Constant(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Continue(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}n/a
function AST_DWLoop(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}n/a
function AST_Debugger(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Default(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Definitions(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions
;}}n/a
function AST_Defun(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props.
cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
function AST_Directive(props){ if (props) { this.end = props.end;this.start = props.start;this.quote = props.quote;this.scope =
props.scope;this.value = props.value;}}n/a
function AST_Do(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}n/a
function AST_Dot(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}n/a
function AST_EmptyStatement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Exit(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
function AST_False(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Finally(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_For(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.step = props.step
;this.condition = props.condition;this.init = props.init;}}n/a
function AST_ForIn(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.object = props
.object;this.name = props.name;this.init = props.init;}}n/a
function AST_Function(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
function AST_Hole(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_If(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.alternative = props
.alternative;this.condition = props.condition;}}n/a
function AST_Infinity(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_IterationStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Jump(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Label(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;this.references = props.references;this.initialize();}}n/a
function AST_LabelRef(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name =
props.name;this.scope = props.scope;}}n/a
function AST_LabeledStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.label
= props.label;}}n/a
function AST_Lambda(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
function AST_LoopControl(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}n/a
function AST_NaN(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_New(props){ if (props) { this.end = props.end;this.start = props.start;this.args = props.args;this.expression = props
.expression;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Null(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Number(props){ if (props) { this.end = props.end;this.start = props.start;this.literal = props.literal;this.value =
props.value;}}n/a
function AST_Object(props){ if (props) { this.end = props.end;this.start = props.start;this.properties = props.properties;}}n/a
function AST_ObjectGetter(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key =
props.key;}}n/a
function AST_ObjectKeyVal(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key =
props.key;this.quote = props.quote;}}n/a
function AST_ObjectProperty(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key
= props.key;}}n/a
function AST_ObjectSetter(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key =
props.key;}}n/a
function AST_PropAccess(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}n/a
function AST_RegExp(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
function AST_Return(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
function AST_Scope(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props.
cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;}}n/a
function AST_Seq(props){ if (props) { this.end = props.end;this.start = props.start;this.cdr = props.cdr;this.car = props.car;}}n/a
function AST_SimpleStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Statement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_StatementWithBody(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_String(props){ if (props) { this.end = props.end;this.start = props.start;this.quote = props.quote;this.value = props
.value;}}n/a
function AST_Sub(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}n/a
function AST_Switch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.expression =
props.expression;}}n/a
function AST_SwitchBranch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Symbol(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}n/a
function AST_SymbolAccessor(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;}}n/a
function AST_SymbolCatch(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolConst(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolDeclaration(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this
.name = props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolDefun(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolFunarg(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolLambda(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolRef(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name =
props.name;this.scope = props.scope;}}n/a
function AST_SymbolVar(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name =
props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_This(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}n/a
function AST_Throw(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
function AST_Token(props){ if (props) { this.raw = props.raw;this.file = props.file;this.comments_before = props.comments_before
;this.nlb = props.nlb;this.endpos = props.endpos;this.endcol = props.endcol;this.endline = props.endline;this.pos = props.pos;this
.col = props.col;this.line = props.line;this.value = props.value;this.type = props.type;}}n/a
function AST_Toplevel(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.globals = props
.globals;}}n/a
function AST_True(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Try(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.bfinally = props
.bfinally;this.bcatch = props.bcatch;}}n/a
function AST_Unary(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;this.operator
= props.operator;}}n/a
function AST_UnaryPostfix(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;
this.operator = props.operator;}}n/a
function AST_UnaryPrefix(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;this
.operator = props.operator;}}n/a
function AST_Undefined(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Var(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions;}}n/a
function AST_VarDef(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.name = props
.name;}}n/a
function AST_While(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}n/a
function AST_With(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.expression = props
.expression;}}n/a
function Compressor(options, false_by_default) {
if (!(this instanceof Compressor))
return new Compressor(options, false_by_default);
TreeTransformer.call(this, this.before, this.after);
this.options = defaults(options, {
angular : false,
booleans : !false_by_default,
cascade : !false_by_default,
collapse_vars : !false_by_default,
comparisons : !false_by_default,
conditionals : !false_by_default,
dead_code : !false_by_default,
drop_console : false,
drop_debugger : !false_by_default,
evaluate : !false_by_default,
expression : false,
global_defs : {},
hoist_funs : !false_by_default,
hoist_vars : false,
if_return : !false_by_default,
join_vars : !false_by_default,
keep_fargs : true,
keep_fnames : false,
keep_infinity : false,
loops : !false_by_default,
negate_iife : !false_by_default,
passes : 1,
properties : !false_by_default,
pure_getters : !false_by_default && "strict",
pure_funcs : null,
reduce_vars : !false_by_default,
screw_ie8 : true,
sequences : !false_by_default,
side_effects : !false_by_default,
switches : !false_by_default,
top_retain : null,
toplevel : !!(options && options["top_retain"]),
unsafe : false,
unsafe_comps : false,
unsafe_math : false,
unsafe_proto : false,
unused : !false_by_default,
warnings : true,
}, true);
var pure_funcs = this.options["pure_funcs"];
if (typeof pure_funcs == "function") {
this.pure_funcs = pure_funcs;
} else {
this.pure_funcs = pure_funcs ? function(node) {
return pure_funcs.indexOf(node.expression.print_to_string()) < 0;
} : return_true;
}
var top_retain = this.options["top_retain"];
if (top_retain instanceof RegExp) {
this.top_retain = function(def) {
return top_retain.test(def.name);
};
} else if (typeof top_retain == "function") {
this.top_retain = top_retain;
} else if (top_retain) {
if (typeof top_retain == "string") {
top_retain = top_retain.split(/,/);
}
this.top_retain = function(def) {
return top_retain.indexOf(def.name) >= 0;
};
}
var sequences = this.options["sequences"];
this.sequences_limit = sequences == 1 ? 200 : sequences | 0;
this.warnings_produced = {};
}...
```javascript
function uglify(ast, options, mangle) {
// Conversion from SpiderMonkey AST to internal format
var uAST = UglifyJS.AST_Node.from_mozilla_ast(ast);
// Compression
uAST.figure_out_scope();
uAST = UglifyJS.Compressor(options).compress(uAST);
// Mangling (optional)
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
...function DefaultsError(msg, defs) {
this.message = msg;
this.defs = defs;
}n/a
function Dictionary() {
this._values = Object.create(null);
this._size = 0;
}n/a
function JS_Parse_Error(message, filename, line, col, pos) {
this.message = message;
this.filename = filename;
this.line = line;
this.col = col;
this.pos = pos;
}n/a
function MAP(a, f, backwards) {
var ret = [], top = [], i;
function doit() {
var val = f(a[i], i);
var is_last = val instanceof Last;
if (is_last) val = val.v;
if (val instanceof AtTop) {
val = val.v;
if (val instanceof Splice) {
top.push.apply(top, backwards ? val.v.slice().reverse() : val.v);
} else {
top.push(val);
}
}
else if (val !== skip) {
if (val instanceof Splice) {
ret.push.apply(ret, backwards ? val.v.slice().reverse() : val.v);
} else {
ret.push(val);
}
}
return is_last;
};
if (a instanceof Array) {
if (backwards) {
for (i = a.length; --i >= 0;) if (doit()) break;
ret.reverse();
top.reverse();
} else {
for (i = 0; i < a.length; ++i) if (doit()) break;
}
}
else {
for (i in a) if (HOP(a, i)) if (doit()) break;
}
return top.concat(ret);
}n/a
function OutputStream(options) {
options = defaults(options, {
ascii_only : false,
beautify : false,
bracketize : false,
comments : false,
indent_level : 4,
indent_start : 0,
inline_script : true,
keep_quoted_props: false,
max_line_len : false,
preamble : null,
preserve_line : false,
quote_keys : false,
quote_style : 0,
screw_ie8 : true,
semicolons : true,
shebang : true,
source_map : null,
space_colon : true,
unescape_regexps : false,
width : 80,
wrap_iife : false,
}, true);
// Convert comment option to RegExp if neccessary and set up comments filter
var comment_filter = return_false; // Default case, throw all comments away
if (options.comments) {
var comments = options.comments;
if (typeof options.comments === "string" && /^\/.*\/[a-zA-Z]*$/.test(options.comments)) {
var regex_pos = options.comments.lastIndexOf("/");
comments = new RegExp(
options.comments.substr(1, regex_pos - 1),
options.comments.substr(regex_pos + 1)
);
}
if (comments instanceof RegExp) {
comment_filter = function(comment) {
return comment.type != "comment5" && comments.test(comment.value);
};
}
else if (typeof comments === "function") {
comment_filter = function(comment) {
return comment.type != "comment5" && comments(this, comment);
};
}
else if (comments === "some") {
comment_filter = is_some_comments;
} else { // NOTE includes "all" option
comment_filter = return_true;
}
}
var indentation = 0;
var current_col = 0;
var current_line = 1;
var current_pos = 0;
var OUTPUT = "";
function to_ascii(str, identifier) {
return str.replace(/[\u0000-\u001f\u007f-\uffff]/g, function(ch) {
var code = ch.charCodeAt(0).toString(16);
if (code.length <= 2 && !identifier) {
while (code.length < 2) code = "0" + code;
return "\\x" + code;
} else {
while (code.length < 4) code = "0" + code;
return "\\u" + code;
}
});
};
function make_string(str, quote) {
var dq = 0, sq = 0;
str = str.replace(/[\\\b\f\n\r\v\t\x22\x27\u2028\u2029\0\ufeff]/g,
function(s, i){
switch (s) {
case '"': ++dq; return '"';
case "'": ++sq; return "'";
case "\\": return "\\\\";
case "\n": return "\\n";
case "\r": return "\\r";
case "\t": return "\\t";
case "\b": return "\\b";
case "\f": return "\\f";
case "\x0B": return options.screw_ie8 ? "\\v" : "\\x0B";
case "\u2028": return "\\u2028";
case "\u2029": return "\\u2029";
case "\ufeff": return "\\ufeff";
case "\0":
return /[0-7]/.test(str.charAt(i+1)) ? "\\x00" : "\\0";
}
return s;
});
function quote_single() {
return "'" + str.replace(/\x27/g, "\\'") + "'";
}
function quote_double() {
return '"' + str.replace(/\x22/g, '\\"') + '"';
}
if (options.ascii_only) str = to_ascii(str);
switch (options.quote_style) {
case 1:
return quote_single();
case 2:
return quote_double();
case 3:
return quote == "'" ? quote_single() : quote_double();
default:
return dq > sq ? quote_single() : quote_double();
}
};
function encode_string(str, quote) {
var ret = make_string(str, quote);
if (options.inlin ......
```
#### Generating output
AST nodes have a `print` method that takes an output stream. Essentially,
to generate code you do this:
```javascript
var stream = UglifyJS.OutputStream(options);
compressed_ast.print(stream);
var code = stream.toString(); // this is your minified code
```
or, for a shortcut you can do:
```javascript
var code = compressed_ast.print_to_string(options);
...function SourceMap(options) {
options = defaults(options, {
file : null,
root : null,
orig : null,
orig_line_diff : 0,
dest_line_diff : 0,
});
var generator = new MOZ_SourceMap.SourceMapGenerator({
file : options.file,
sourceRoot : options.root
});
var orig_map = options.orig && new MOZ_SourceMap.SourceMapConsumer(options.orig);
if (orig_map && Array.isArray(options.orig.sources)) {
orig_map._sources.toArray().forEach(function(source) {
var sourceContent = orig_map.sourceContentFor(source, true);
if (sourceContent) {
generator.setSourceContent(source, sourceContent);
}
});
}
function add(source, gen_line, gen_col, orig_line, orig_col, name) {
if (orig_map) {
var info = orig_map.originalPositionFor({
line: orig_line,
column: orig_col
});
if (info.source === null) {
return;
}
source = info.source;
orig_line = info.line;
orig_col = info.column;
name = info.name || name;
}
generator.addMapping({
generated : { line: gen_line + options.dest_line_diff, column: gen_col },
original : { line: orig_line + options.orig_line_diff, column: orig_col },
source : source,
name : name
});
};
return {
add : add,
get : function() { return generator },
toString : function() { return JSON.stringify(generator.toJSON()); }
};
}...
You need to pass the `source_map` argument when calling `print`. It needs
to be a `SourceMap` object (which is a thin wrapper on top of the
[source-map][source-map] library).
Example:
```javascript
var source_map = UglifyJS.SourceMap(source_map_options);
var stream = UglifyJS.OutputStream({
...
source_map: source_map
});
compressed_ast.print(stream);
var code = stream.toString();
...function SymbolDef(scope, index, orig) {
this.name = orig.name;
this.orig = [ orig ];
this.scope = scope;
this.references = [];
this.global = false;
this.mangled_name = null;
this.undeclared = false;
this.index = index;
this.id = SymbolDef.next_id++;
}n/a
function TreeTransformer(before, after) {
TreeWalker.call(this);
this.before = before;
this.after = after;
}n/a
function TreeWalker(callback) {
this.visit = callback;
this.stack = [];
this.directives = Object.create(null);
}...
console.log("%s", JSON.stringify(output, null, 2));
}
function getProps(filename) {
var code = fs.readFileSync(filename, "utf8");
var ast = U2.parse(code);
ast.walk(new U2.TreeWalker(function(node){
if (node instanceof U2.AST_ObjectKeyVal) {
add(node.key);
}
else if (node instanceof U2.AST_ObjectProperty) {
add(node.key.name);
}
else if (node instanceof U2.AST_Dot) {
...function base54(num) {
var ret = "", base = 54;
num++;
do {
num--;
ret += String.fromCharCode(chars[num % base]);
num = Math.floor(num / base);
base = 64;
} while (num > 0);
return ret;
}n/a
function defaults(args, defs, croak) {
if (args === true)
args = {};
var ret = args || {};
if (croak) for (var i in ret) if (HOP(ret, i) && !HOP(defs, i))
DefaultsError.croak("`" + i + "` is not a supported option", defs);
for (var i in defs) if (HOP(defs, i)) {
ret[i] = (args && HOP(args, i)) ? args[i] : defs[i];
}
return ret;
}n/a
describe_ast = function () {
var out = UglifyJS.OutputStream({ beautify: true });
function doitem(ctor) {
out.print("AST_" + ctor.TYPE);
var props = ctor.SELF_PROPS.filter(function(prop){
return !/^\$/.test(prop);
});
if (props.length > 0) {
out.space();
out.with_parens(function(){
props.forEach(function(prop, i){
if (i) out.space();
out.print(prop);
});
});
}
if (ctor.documentation) {
out.space();
out.print_string(ctor.documentation);
}
if (ctor.SUBCLASSES.length > 0) {
out.space();
out.with_block(function(){
ctor.SUBCLASSES.forEach(function(ctor, i){
out.indent();
doitem(ctor);
out.newline();
});
});
}
};
doitem(UglifyJS.AST_Node);
return out + "";
}n/a
function is_identifier(name) {
return !RESERVED_WORDS(name) && /^[a-z_$][a-z0-9_$]*$/i.test(name);
}n/a
function mangle_properties(ast, options) {
options = defaults(options, {
cache: null,
debug: false,
ignore_quoted: false,
only_cache: false,
regex: null,
reserved: null,
});
var reserved = options.reserved;
if (reserved == null)
reserved = find_builtins();
var cache = options.cache;
if (cache == null) {
cache = {
cname: -1,
props: new Dictionary()
};
}
var regex = options.regex;
var ignore_quoted = options.ignore_quoted;
// note debug is either false (disabled), or a string of the debug suffix to use (enabled).
// note debug may be enabled as an empty string, which is falsey. Also treat passing 'true'
// the same as passing an empty string.
var debug = (options.debug !== false);
var debug_name_suffix;
if (debug) {
debug_name_suffix = (options.debug === true ? "" : options.debug);
}
var names_to_mangle = [];
var unmangleable = [];
var ignored = {};
// step 1: find candidates to mangle
ast.walk(new TreeWalker(function(node){
if (node instanceof AST_ObjectKeyVal) {
add(node.key, ignore_quoted && node.quote);
}
else if (node instanceof AST_ObjectProperty) {
// setter or getter, since KeyVal is handled above
add(node.key.name);
}
else if (node instanceof AST_Dot) {
add(node.property);
}
else if (node instanceof AST_Sub) {
addStrings(node.property, ignore_quoted);
}
}));
// step 2: transform the tree, renaming properties
return ast.transform(new TreeTransformer(function(node){
if (node instanceof AST_ObjectKeyVal) {
if (!(ignore_quoted && node.quote))
node.key = mangle(node.key);
}
else if (node instanceof AST_ObjectProperty) {
// setter or getter
node.key.name = mangle(node.key.name);
}
else if (node instanceof AST_Dot) {
node.property = mangle(node.property);
}
else if (node instanceof AST_Sub) {
if (!ignore_quoted)
node.property = mangleStrings(node.property);
}
// else if (node instanceof AST_String) {
// if (should_mangle(node.value)) {
// AST_Node.warn(
// "Found \"{prop}\" property candidate for mangling in an arbitrary string [{file}:{line},{col}]", {
// file : node.start.file,
// line : node.start.line,
// col : node.start.col,
// prop : node.value
// }
// );
// }
// }
}));
// only function declarations after this line
function can_mangle(name) {
if (unmangleable.indexOf(name) >= 0) return false;
if (reserved.indexOf(name) >= 0) return false;
if (options.only_cache) {
return cache.props.has(name);
}
if (/^-?[0-9]+(\.[0-9]+)?(e[+-][0-9]+)?$/.test(name)) return false;
return true;
}
function should_mangle(name) {
if (ignore_quoted && name in ignored) return false;
if (regex && !regex.test(name)) return false;
if (reserved.indexOf(name) >= 0) return false;
return cache.props.has(name)
|| names_to_mangle.indexOf(name) >= 0;
}
function add(name, ignore) {
if (ignore) {
ignored[name] = true;
return;
}
if (can_mangle(name))
push_uniq(names_to_mangle, name);
if (!should_mangle(name)) {
push_uniq(unmangleable, name);
}
}
function mangle(name) {
if (!should_mangle(name)) {
return name;
}
var mangled = cache.props.get(name);
if (!mangled) {
if (debug) {
// debug mode: use a prefix and suffix to preserve readability, e.g. o.foo -> o._$foo$NNN_. ...n/a
function merge(obj, ext) {
var count = 0;
for (var i in ext) if (HOP(ext, i)) {
obj[i] = ext[i];
count++;
}
return count;
}n/a
minify = function (files, options) {
options = UglifyJS.defaults(options, {
compress : {},
fromString : false,
inSourceMap : null,
mangle : {},
mangleProperties : false,
nameCache : null,
outFileName : null,
output : null,
outSourceMap : null,
parse : {},
sourceMapInline : false,
sourceMapUrl : null,
sourceRoot : null,
spidermonkey : false,
warnings : false,
});
UglifyJS.base54.reset();
var inMap = options.inSourceMap;
if (typeof inMap == "string" && inMap != "inline") {
inMap = JSON.parse(fs.readFileSync(inMap, "utf8"));
}
// 1. parse
var toplevel = null,
sourcesContent = {};
if (options.spidermonkey) {
if (inMap == "inline") {
throw new Error("inline source map only works with built-in parser");
}
toplevel = UglifyJS.AST_Node.from_mozilla_ast(files);
} else {
function addFile(file, fileUrl) {
var code = options.fromString
? file
: fs.readFileSync(file, "utf8");
if (inMap == "inline") {
inMap = read_source_map(code);
}
sourcesContent[fileUrl] = code;
toplevel = UglifyJS.parse(code, {
filename: fileUrl,
toplevel: toplevel,
bare_returns: options.parse ? options.parse.bare_returns : undefined
});
}
if (!options.fromString) {
files = UglifyJS.simple_glob(files);
if (inMap == "inline" && files.length > 1) {
throw new Error("inline source map only works with singular input");
}
}
[].concat(files).forEach(function (files, i) {
if (typeof files === 'string') {
addFile(files, options.fromString ? i : files);
} else {
for (var fileUrl in files) {
addFile(files[fileUrl], fileUrl);
}
}
});
}
if (options.wrap) {
toplevel = toplevel.wrap_commonjs(options.wrap, options.exportAll);
}
// 2. compress
if (options.compress) {
var compress = { warnings: options.warnings };
UglifyJS.merge(compress, options.compress);
toplevel.figure_out_scope(options.mangle);
var sq = UglifyJS.Compressor(compress);
toplevel = sq.compress(toplevel);
}
// 3. mangle properties
if (options.mangleProperties || options.nameCache) {
options.mangleProperties.cache = UglifyJS.readNameCache(options.nameCache, "props");
toplevel = UglifyJS.mangle_properties(toplevel, options.mangleProperties);
UglifyJS.writeNameCache(options.nameCache, "props", options.mangleProperties.cache);
}
// 4. mangle
if (options.mangle) {
toplevel.figure_out_scope(options.mangle);
toplevel.compute_char_frequency(options.mangle);
toplevel.mangle_names(options.mangle);
}
// 5. output
var output = { max_line_len: 32000 };
if (options.outSourceMap || options.sourceMapInline) {
output.source_map = UglifyJS.SourceMap({
// prefer outFileName, otherwise use outSourceMap without .map suffix
file: options.outFileName || (typeof options.outSourceMap === 'string' ? options.outSourceMap.replace(/\.map$/i, '') :
null),
orig: inMap,
root: options.sourceRoot
});
if (options.sourceMapIncludeSources) {
for (var file in sourcesContent) {
if (sourcesContent.hasOwnProperty(file)) {
output.source_map.get().setSourceContent(file, sourcesContent[file]);
}
}
}
}
if (options.output) {
UglifyJS.merge(output, options.output);
}
var stream = UglifyJS.OutputStream(output);
toplevel.print(stream);
var source_map = output.source ......
<a name="codegen-options"></a>
#### Conditional compilation, API
You can also use conditional compilation via the programmatic API. With the difference that the
property name is `global_defs` and is a compressor property:
```js
uglifyJS.minify([ "input.js"], {
compress: {
dead_code: true,
global_defs: {
DEBUG: false
}
}
});
...function parse($TEXT, options) {
options = defaults(options, {
bare_returns : false,
cli : false,
expression : false,
filename : null,
html5_comments : true,
shebang : true,
strict : false,
toplevel : null,
});
var S = {
input : (typeof $TEXT == "string"
? tokenizer($TEXT, options.filename,
options.html5_comments, options.shebang)
: $TEXT),
token : null,
prev : null,
peeked : null,
in_function : 0,
in_directives : true,
in_loop : 0,
labels : []
};
S.token = next();
function is(type, value) {
return is_token(S.token, type, value);
};
function peek() { return S.peeked || (S.peeked = S.input()); };
function next() {
S.prev = S.token;
if (S.peeked) {
S.token = S.peeked;
S.peeked = null;
} else {
S.token = S.input();
}
S.in_directives = S.in_directives && (
S.token.type == "string" || is("punc", ";")
);
return S.token;
};
function prev() {
return S.prev;
};
function croak(msg, line, col, pos) {
var ctx = S.input.context();
js_error(msg,
ctx.filename,
line != null ? line : ctx.tokline,
col != null ? col : ctx.tokcol,
pos != null ? pos : ctx.tokpos);
};
function token_error(token, msg) {
croak(msg, token.line, token.col);
};
function unexpected(token) {
if (token == null)
token = S.token;
token_error(token, "Unexpected token: " + token.type + " (" + token.value + ")");
};
function expect_token(type, val) {
if (is(type, val)) {
return next();
}
token_error(S.token, "Unexpected token " + S.token.type + " «" + S.token.value + "»" + ", expected " + type + " «" + val
+ "»");
};
function expect(punc) { return expect_token("punc", punc); };
function can_insert_semicolon() {
return !options.strict && (
S.token.nlb || is("eof") || is("punc", "}")
);
};
function semicolon(optional) {
if (is("punc", ";")) next();
else if (!optional && !can_insert_semicolon()) unexpected();
};
function parenthesised() {
expect("(");
var exp = expression(true);
expect(")");
return exp;
};
function embed_tokens(parser) {
return function() {
var start = S.token;
var expr = parser();
var end = prev();
expr.start = start;
expr.end = end;
return expr;
};
};
function handle_regexp() {
if (is("operator", "/") || is("operator", "/=")) {
S.peeked = null;
S.token = S.input(S.token.value.substr(1)); // force regexp
}
};
var statement = embed_tokens(function() {
var tmp;
handle_regexp();
switch (S.token.type) {
case "string":
var dir = false;
if (S.in_directives === true) {
if ((is_token(peek(), "punc", ";") || peek().nlb) && S.token.raw.indexOf("\\") === -1) {
S.input.add_directive(S.token.value);
} else {
S.in_directives = false;
}
}
var dir = S.in_directives, stat = simple_statement();
if (dir) {
return new AST_Directive({
start : stat.body.start,
end : stat.body.end,
quote : stat.body.quote,
value : stat.body.value,
});
}
return stat;
case "num":
case "regexp":
case "operator":
case "atom": ......
```
If your input source map is not in a file, you can pass it in as an object
using the `inSourceMap` argument:
```javascript
var result = UglifyJS.minify("compiled.js", {
inSourceMap: JSON.parse(my_source_map_string),
outSourceMap: "minified.js.map"
});
```
The `inSourceMap` is only used if you also request `outSourceMap` (it makes
no sense otherwise).
...function push_uniq(array, el) {
if (array.indexOf(el) < 0)
array.push(el);
}n/a
readDefaultReservedFile = function (reserved) {
return readReservedFile(require.resolve("./domprops.json"), reserved);
}n/a
readNameCache = function (filename, key) {
var cache = null;
if (filename) {
try {
var cache = fs.readFileSync(filename, "utf8");
cache = JSON.parse(cache)[key];
if (!cache) throw "init";
cache.props = UglifyJS.Dictionary.fromObject(cache.props);
} catch(ex) {
cache = {
cname: -1,
props: new UglifyJS.Dictionary()
};
}
}
return cache;
}n/a
function readReservedFile(filename, reserved) {
if (!reserved) {
reserved = { vars: [], props: [] };
}
var data = fs.readFileSync(filename, "utf8");
data = JSON.parse(data);
if (data.vars) {
data.vars.forEach(function(name){
UglifyJS.push_uniq(reserved.vars, name);
});
}
if (data.props) {
data.props.forEach(function(name){
UglifyJS.push_uniq(reserved.props, name);
});
}
return reserved;
}n/a
function simple_glob(glob) {
if (Array.isArray(glob)) {
return [].concat.apply([], glob.map(simple_glob));
}
if (glob.match(/\*|\?/)) {
var dir = path.dirname(glob);
try {
var entries = fs.readdirSync(dir);
} catch (ex) {}
if (entries) {
var pattern = "^" + path.basename(glob)
.replace(/[.+^$[\]\\(){}]/g, "\\$&")
.replace(/\*/g, "[^/\\\\]*")
.replace(/\?/g, "[^/\\\\]") + "$";
var mod = process.platform === "win32" ? "i" : "";
var rx = new RegExp(pattern, mod);
var results = entries.filter(function(name) {
return rx.test(name);
}).map(function(name) {
return path.join(dir, name);
});
if (results.length) return results;
}
}
return [ glob ];
}n/a
function string_template(text, props) {
return text.replace(/\{(.+?)\}/g, function(str, p){
return props && props[p];
});
}n/a
function tokenizer($TEXT, filename, html5_comments, shebang) {
var S = {
text : $TEXT,
filename : filename,
pos : 0,
tokpos : 0,
line : 1,
tokline : 0,
col : 0,
tokcol : 0,
newline_before : false,
regex_allowed : false,
comments_before : [],
directives : {},
directive_stack : []
};
function peek() { return S.text.charAt(S.pos); };
function next(signal_eof, in_string) {
var ch = S.text.charAt(S.pos++);
if (signal_eof && !ch)
throw EX_EOF;
if (NEWLINE_CHARS(ch)) {
S.newline_before = S.newline_before || !in_string;
++S.line;
S.col = 0;
if (!in_string && ch == "\r" && peek() == "\n") {
// treat a \r\n sequence as a single \n
++S.pos;
ch = "\n";
}
} else {
++S.col;
}
return ch;
};
function forward(i) {
while (i-- > 0) next();
};
function looking_at(str) {
return S.text.substr(S.pos, str.length) == str;
};
function find_eol() {
var text = S.text;
for (var i = S.pos, n = S.text.length; i < n; ++i) {
var ch = text[i];
if (NEWLINE_CHARS(ch))
return i;
}
return -1;
};
function find(what, signal_eof) {
var pos = S.text.indexOf(what, S.pos);
if (signal_eof && pos == -1) throw EX_EOF;
return pos;
};
function start_token() {
S.tokline = S.line;
S.tokcol = S.col;
S.tokpos = S.pos;
};
var prev_was_dot = false;
function token(type, value, is_comment) {
S.regex_allowed = ((type == "operator" && !UNARY_POSTFIX(value)) ||
(type == "keyword" && KEYWORDS_BEFORE_EXPRESSION(value)) ||
(type == "punc" && PUNC_BEFORE_EXPRESSION(value)));
prev_was_dot = (type == "punc" && value == ".");
var ret = {
type : type,
value : value,
line : S.tokline,
col : S.tokcol,
pos : S.tokpos,
endline : S.line,
endcol : S.col,
endpos : S.pos,
nlb : S.newline_before,
file : filename
};
if (/^(?:num|string|regexp)$/i.test(type)) {
ret.raw = $TEXT.substring(ret.pos, ret.endpos);
}
if (!is_comment) {
ret.comments_before = S.comments_before;
S.comments_before = [];
// make note of any newlines in the comments that came before
for (var i = 0, len = ret.comments_before.length; i < len; i++) {
ret.nlb = ret.nlb || ret.comments_before[i].nlb;
}
}
S.newline_before = false;
return new AST_Token(ret);
};
function skip_whitespace() {
while (WHITESPACE_CHARS(peek()))
next();
};
function read_while(pred) {
var ret = "", ch, i = 0;
while ((ch = peek()) && pred(ch, i++))
ret += next();
return ret;
};
function parse_error(err) {
js_error(err, filename, S.tokline, S.tokcol, S.tokpos);
};
function read_num(prefix) {
var has_e = false, after_e = false, has_x = false, has_dot = prefix == ".";
var num = read_while(function(ch, i){
var code = ch.charCodeAt(0);
switch (code) {
case 120: case 88: // xX
return has_x ? false : (has_x = true);
case 101: case 69: // eE
return has_x ? true : has_e ? false : (has_e = after_e = true);
case 45: // -
return after_e || (i == 0 && !prefix);
case 43: // +
return after_e;
case (after_e = false, 46): // .
return (!has_dot && !has_x && !ha ...n/a
writeNameCache = function (filename, key, cache) {
if (filename) {
var data;
try {
data = fs.readFileSync(filename, "utf8");
data = JSON.parse(data);
} catch(ex) {
data = {};
}
data[key] = {
cname: cache.cname,
props: cache.props.toObject()
};
fs.writeFileSync(filename, JSON.stringify(data, null, 2), "utf8");
}
}n/a
function AST_Accessor(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
function AST_Lambda(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Accessor(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function AST_Array(props){ if (props) { this.end = props.end;this.start = props.start;this.elements = props.elements;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Array(props){ if (props) { this.end = props.end;this.start = props.start;this.elements = props.elements;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.with_square(function(){
var a = self.elements, len = a.length;
if (len > 0) output.space();
a.forEach(function(exp, i){
if (i) output.comma();
exp.print(output);
// If the final element is a hole, we need to make sure it
// doesn't look like a trailing comma, by inserting an actual
// trailing comma.
if (i === len - 1 && exp instanceof AST_Hole)
output.comma();
});
if (len > 0) output.space();
});
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...function return_false() { return false; }...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
..._eval = function (compressor){
if (compressor.option("unsafe")) {
return this.elements.map(function(element) {
return ev(element, compressor);
});
}
throw def;
}...
// then its value is returned; otherwise the element itself
// is returned.
// They can be distinguished as constant value is never a
// descendant of AST_Node.
AST_Node.DEFMETHOD("evaluate", function(compressor){
if (!compressor.option("evaluate")) return this;
try {
var val = this._eval(compressor);
return !val || val instanceof RegExp || typeof val != "object" ? val : this;
} catch(ex) {
if (ex !== def) throw ex;
return this;
}
});
var unaryPrefix = makePredicate("! ~ - + void");
..._walk = function (visitor) {
return visitor._visit(this, function(){
var elements = this.elements;
for (var i = 0, len = elements.length; i < len; i++) {
elements[i]._walk(visitor);
}
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...drop_side_effect_free = function (compressor, first_in_statement){
var values = trim(this.elements, compressor, first_in_statement);
return values && AST_Seq.from_array(values);
}...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...has_side_effects = function (compressor){
return any(this.elements, compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Assign(props){ if (props) { this.end = props.end;this.start = props.start;this.right = props.right;this.operator =
props.operator;this.left = props.left;}}n/a
function AST_Binary(props){ if (props) { this.end = props.end;this.start = props.start;this.right = props.right;this.operator =
props.operator;this.left = props.left;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Assign(props){ if (props) { this.end = props.end;this.start = props.start;this.right = props.right;this.operator =
props.operator;this.left = props.left;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._eq_null = function (pure_getters) {
return this.operator == "="
&& this.right._eq_null(pure_getters);
}...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
...function return_this() { return this; }...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...function return_true() { return true; }...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...is_boolean = function (){
return this.operator == "=" && this.right.is_boolean();
}...
def(AST_Node, return_false);
def(AST_UnaryPrefix, function(){
return member(this.operator, unary_bool);
});
def(AST_Binary, function(){
return member(this.operator, binary_bool) ||
( (this.operator == "&&" || this.operator == "||") &&
this.left.is_boolean() && this.right.is_boolean() );
});
def(AST_Conditional, function(){
return this.consequent.is_boolean() && this.alternative.is_boolean();
});
def(AST_Assign, function(){
return this.operator == "=" && this.right.is_boolean();
});
...is_number = function (compressor){
return binary(this.operator.slice(0, -1))
|| this.operator == "=" && this.right.is_number(compressor);
}...
var unary = makePredicate("+ - ~ ++ --");
def(AST_Unary, function(){
return unary(this.operator);
});
var binary = makePredicate("- * / % & | ^ << >> >>>");
def(AST_Binary, function(compressor){
return binary(this.operator) || this.operator == "+"
&& this.left.is_number(compressor)
&& this.right.is_number(compressor);
});
def(AST_Assign, function(compressor){
return binary(this.operator.slice(0, -1))
|| this.operator == "=" && this.right.is_number(compressor);
});
def(AST_Seq, function(compressor){
...is_string = function (compressor){
return (this.operator == "=" || this.operator == "+=") && this.right.is_string(compressor);
}...
def(AST_Node, return_false);
def(AST_String, return_true);
def(AST_UnaryPrefix, function(){
return this.operator == "typeof";
});
def(AST_Binary, function(compressor){
return this.operator == "+" &&
(this.left.is_string(compressor) || this.right.is_string(compressor));
});
def(AST_Assign, function(compressor){
return (this.operator == "=" || this.operator == "+=") && this.right.is_string(compressor);
});
def(AST_Seq, function(compressor){
return this.cdr.is_string(compressor);
});
...needs_parens = function (output){
var p = output.parent();
// !(a = false) → true
if (p instanceof AST_Unary)
return true;
// 1 + (a = 2) + 3 → 6, side effect setting a = 2
if (p instanceof AST_Binary && !(p instanceof AST_Assign))
return true;
// (a = func)() —or— new (a = Object)()
if (p instanceof AST_Call && p.expression === this)
return true;
// (a = foo) ? bar : baz
if (p instanceof AST_Conditional && p.condition === this)
return true;
// (a = foo)["prop"] —or— (a = foo).prop
if (p instanceof AST_PropAccess && p.expression === this)
return true;
}...
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
if (self instanceof AST_Scope) {
use_asm = prev_use_asm;
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Atom(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Constant(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Null(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_NaN(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Undefined(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Hole(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Infinity(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Boolean(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Atom(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Binary(props){ if (props) { this.end = props.end;this.start = props.start;this.right = props.right;this.operator =
props.operator;this.left = props.left;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Assign(props){ if (props) { this.end = props.end;this.start = props.start;this.right = props.right;this.operator =
props.operator;this.left = props.left;}}n/a
function AST_Binary(props){ if (props) { this.end = props.end;this.start = props.start;this.right = props.right;this.operator =
props.operator;this.left = props.left;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
var op = self.operator;
self.left.print(output);
if (op[0] == ">" /* ">>" ">>>" ">" ">=" */
&& self.left instanceof AST_UnaryPostfix
&& self.left.operator == "--") {
// space is mandatory to avoid outputting -->
output.print(" ");
} else {
// the space is optional depending on "beautify"
output.space();
}
output.print(op);
if ((op == "<" || op == "<<")
&& self.right instanceof AST_UnaryPrefix
&& self.right.operator == "!"
&& self.right.expression instanceof AST_UnaryPrefix
&& self.right.expression.operator == "--") {
// space is mandatory to avoid outputting <!--
output.print(" ");
} else {
// the space is optional depending on "beautify"
output.space();
}
self.right.print(output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._eq_null = function (pure_getters) {
switch (this.operator) {
case "&&":
return this.left._eq_null(pure_getters);
case "||":
return this.left._eq_null(pure_getters)
&& this.right._eq_null(pure_getters);
default:
return false;
}
}...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
..._eval = function (c){
var left = this.left, right = this.right, result;
switch (this.operator) {
case "&&" : result = ev(left, c) && ev(right, c); break;
case "||" : result = ev(left, c) || ev(right, c); break;
case "|" : result = ev(left, c) | ev(right, c); break;
case "&" : result = ev(left, c) & ev(right, c); break;
case "^" : result = ev(left, c) ^ ev(right, c); break;
case "+" : result = ev(left, c) + ev(right, c); break;
case "*" : result = ev(left, c) * ev(right, c); break;
case "/" : result = ev(left, c) / ev(right, c); break;
case "%" : result = ev(left, c) % ev(right, c); break;
case "-" : result = ev(left, c) - ev(right, c); break;
case "<<" : result = ev(left, c) << ev(right, c); break;
case ">>" : result = ev(left, c) >> ev(right, c); break;
case ">>>" : result = ev(left, c) >>> ev(right, c); break;
case "==" : result = ev(left, c) == ev(right, c); break;
case "===" : result = ev(left, c) === ev(right, c); break;
case "!=" : result = ev(left, c) != ev(right, c); break;
case "!==" : result = ev(left, c) !== ev(right, c); break;
case "<" : result = ev(left, c) < ev(right, c); break;
case "<=" : result = ev(left, c) <= ev(right, c); break;
case ">" : result = ev(left, c) > ev(right, c); break;
case ">=" : result = ev(left, c) >= ev(right, c); break;
default:
throw def;
}
if (isNaN(result) && c.find_parent(AST_With)) {
// leave original expression as is
throw def;
}
return result;
}...
// then its value is returned; otherwise the element itself
// is returned.
// They can be distinguished as constant value is never a
// descendant of AST_Node.
AST_Node.DEFMETHOD("evaluate", function(compressor){
if (!compressor.option("evaluate")) return this;
try {
var val = this._eval(compressor);
return !val || val instanceof RegExp || typeof val != "object" ? val : this;
} catch(ex) {
if (ex !== def) throw ex;
return this;
}
});
var unaryPrefix = makePredicate("! ~ - + void");
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.left._walk(visitor);
this.right._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...drop_side_effect_free = function (compressor, first_in_statement){
var right = this.right.drop_side_effect_free(compressor);
if (!right) return this.left.drop_side_effect_free(compressor, first_in_statement);
switch (this.operator) {
case "&&":
case "||":
if (right === this.right) return this;
var node = this.clone();
node.right = right;
return node;
default:
var left = this.left.drop_side_effect_free(compressor, first_in_statement);
if (!left) return this.right.drop_side_effect_free(compressor, first_in_statement);
return make_node(AST_Seq, this, {
car: left,
cdr: right
});
}
}...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...has_side_effects = function (compressor){
return this.left.has_side_effects(compressor)
|| this.right.has_side_effects(compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...is_boolean = function (){
return member(this.operator, binary_bool) ||
( (this.operator == "&&" || this.operator == "||") &&
this.left.is_boolean() && this.right.is_boolean() );
}...
def(AST_Node, return_false);
def(AST_UnaryPrefix, function(){
return member(this.operator, unary_bool);
});
def(AST_Binary, function(){
return member(this.operator, binary_bool) ||
( (this.operator == "&&" || this.operator == "||") &&
this.left.is_boolean() && this.right.is_boolean() );
});
def(AST_Conditional, function(){
return this.consequent.is_boolean() && this.alternative.is_boolean();
});
def(AST_Assign, function(){
return this.operator == "=" && this.right.is_boolean();
});
...is_number = function (compressor){
return binary(this.operator) || this.operator == "+"
&& this.left.is_number(compressor)
&& this.right.is_number(compressor);
}...
var unary = makePredicate("+ - ~ ++ --");
def(AST_Unary, function(){
return unary(this.operator);
});
var binary = makePredicate("- * / % & | ^ << >> >>>");
def(AST_Binary, function(compressor){
return binary(this.operator) || this.operator == "+"
&& this.left.is_number(compressor)
&& this.right.is_number(compressor);
});
def(AST_Assign, function(compressor){
return binary(this.operator.slice(0, -1))
|| this.operator == "=" && this.right.is_number(compressor);
});
def(AST_Seq, function(compressor){
...is_string = function (compressor){
return this.operator == "+" &&
(this.left.is_string(compressor) || this.right.is_string(compressor));
}...
def(AST_Node, return_false);
def(AST_String, return_true);
def(AST_UnaryPrefix, function(){
return this.operator == "typeof";
});
def(AST_Binary, function(compressor){
return this.operator == "+" &&
(this.left.is_string(compressor) || this.right.is_string(compressor));
});
def(AST_Assign, function(compressor){
return (this.operator == "=" || this.operator == "+=") && this.right.is_string(compressor);
});
def(AST_Seq, function(compressor){
return this.cdr.is_string(compressor);
});
...lift_sequences = function (compressor){
if (compressor.option("sequences")) {
if (this.left instanceof AST_Seq) {
var seq = this.left;
var x = seq.to_array();
var e = this.clone();
e.left = x.pop();
x.push(e);
return AST_Seq.from_array(x).optimize(compressor);
}
if (this.right instanceof AST_Seq && !this.left.has_side_effects(compressor)) {
var assign = this.operator == "=" && this.left instanceof AST_SymbolRef;
var root = this.right.clone();
var cursor, seq = root;
while (assign || !seq.car.has_side_effects(compressor)) {
cursor = seq;
if (seq.cdr instanceof AST_Seq) {
seq = seq.cdr = seq.cdr.clone();
} else break;
}
if (cursor) {
var e = this.clone();
e.right = cursor.cdr;
cursor.cdr = e;
return root.optimize(compressor);
}
}
}
return this;
}...
return seq;
}
}
return this;
});
OPT(AST_UnaryPostfix, function(self, compressor){
return self.lift_sequences(compressor);
});
OPT(AST_UnaryPrefix, function(self, compressor){
var e = self.expression;
if (self.operator == "delete"
&& !(e instanceof AST_SymbolRef
|| e instanceof AST_PropAccess
...needs_parens = function (output){
var p = output.parent();
// (foo && bar)()
if (p instanceof AST_Call && p.expression === this)
return true;
// typeof (foo && bar)
if (p instanceof AST_Unary)
return true;
// (foo && bar)["prop"], (foo && bar).prop
if (p instanceof AST_PropAccess && p.expression === this)
return true;
// this deals with precedence: 3 * (2 + 1)
if (p instanceof AST_Binary) {
var po = p.operator, pp = PRECEDENCE[po];
var so = this.operator, sp = PRECEDENCE[so];
if (pp > sp
|| (pp == sp
&& this === p.right)) {
return true;
}
}
}...
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
if (self instanceof AST_Scope) {
use_asm = prev_use_asm;
...negate = function (compressor, first_in_statement){
return func.call(this, compressor, first_in_statement);
}...
continue loop;
}
//---
// if (foo()) return; [ else x... ]; y... ==> if (!foo()) { x...; y... }
if (!stat.body.value && in_lambda) {
CHANGED = true;
stat = stat.clone();
stat.condition = stat.condition.negate(compressor);
var body = as_statement_array(stat.alternative).concat(ret);
var funs = extract_functions_from_statement_array(body);
stat.body = make_node(AST_BlockStatement, stat, {
body: body
});
stat.alternative = null;
ret = funs.concat([ stat.transform(compressor) ]);
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Block(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Statement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_BlockStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Scope(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props.
cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;}}n/a
function AST_Switch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.expression =
props.expression;}}n/a
function AST_SwitchBranch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Try(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.bfinally = props
.bfinally;this.bcatch = props.bcatch;}}n/a
function AST_Catch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.argname = props
.argname;}}n/a
function AST_Finally(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Block(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._walk = function (visitor) {
return visitor._visit(this, function(){
walk_body(this, visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...has_side_effects = function (compressor){
return any(this.body, compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_BlockStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Block(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_BlockStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
print_bracketed(self.body, output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...function block_aborts(){
var n = this.body.length;
return n > 0 && aborts(this.body[n - 1]);
}...
});
})(function(node, func){
node.DEFMETHOD("has_side_effects", func);
});
// tell me if a statement aborts
function aborts(thing) {
return thing && thing.aborts();
};
(function(def){
def(AST_Statement, return_null);
def(AST_Jump, return_this);
function block_aborts(){
var n = this.body.length;
return n > 0 && aborts(this.body[n - 1]);
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Boolean(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Atom(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_False(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_True(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Boolean(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Break(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}n/a
function AST_LoopControl(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Break(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self._do_print(output, "break");
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Call(props){ if (props) { this.end = props.end;this.start = props.start;this.args = props.args;this.expression = props
.expression;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_New(props){ if (props) { this.end = props.end;this.start = props.start;this.args = props.args;this.expression = props
.expression;}}n/a
function AST_Call(props){ if (props) { this.end = props.end;this.start = props.start;this.args = props.args;this.expression = props
.expression;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self.expression.print(output);
if (self instanceof AST_New && !need_constructor_parens(self, output))
return;
output.with_parens(function(){
self.args.forEach(function(expr, i){
if (i) output.comma();
expr.print(output);
});
});
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.expression._walk(visitor);
var args = this.args;
for (var i = 0, len = args.length; i < len; i++) {
args[i]._walk(visitor);
}
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...drop_side_effect_free = function (compressor, first_in_statement){
if (!this.has_pure_annotation(compressor) && compressor.pure_funcs(this)) {
if (this.expression instanceof AST_Function
&& (!this.expression.name || !this.expression.name.definition().references.length)) {
var node = this.clone();
node.expression = node.expression.process_expression(false, compressor);
return node;
}
return this;
}
if (this.pure) {
compressor.warn("Dropping __PURE__ call [{file}:{line},{col}]", this.start);
this.pure.value = this.pure.value.replace(/[@#]__PURE__/g, ' ');
}
var args = trim(this.args, compressor, first_in_statement);
return args && AST_Seq.from_array(args);
}...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...has_pure_annotation = function (compressor) {
if (!compressor.option("side_effects")) return false;
if (this.pure !== undefined) return this.pure;
var pure = false;
var comments, last_comment;
if (this.start
&& (comments = this.start.comments_before)
&& comments.length
&& /[@#]__PURE__/.test((last_comment = comments[comments.length - 1]).value)) {
pure = last_comment;
}
return this.pure = pure;
}...
def(AST_Node, return_true);
def(AST_EmptyStatement, return_false);
def(AST_Constant, return_false);
def(AST_This, return_false);
def(AST_Call, function(compressor){
if (!this.has_pure_annotation(compressor) && compressor.pure_funcs(this
)) return true;
for (var i = this.args.length; --i >= 0;) {
if (this.args[i].has_side_effects(compressor))
return true;
}
return false;
});
...has_side_effects = function (compressor){
if (!this.has_pure_annotation(compressor) && compressor.pure_funcs(this)) return true;
for (var i = this.args.length; --i >= 0;) {
if (this.args[i].has_side_effects(compressor))
return true;
}
return false;
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...needs_parens = function (output){
var p = output.parent(), p1;
if (p instanceof AST_New && p.expression === this)
return true;
// workaround for Safari bug.
// https://bugs.webkit.org/show_bug.cgi?id=123506
return this.expression instanceof AST_Function
&& p instanceof AST_PropAccess
&& p.expression === this
&& (p1 = output.parent(1)) instanceof AST_Assign
&& p1.left === p;
}...
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
if (self instanceof AST_Scope) {
use_asm = prev_use_asm;
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Case(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.expression = props
.expression;}}n/a
function AST_SwitchBranch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Case(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.expression = props
.expression;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("case");
output.space();
self.expression.print(output);
output.print(":");
self._do_print_body(output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.expression._walk(visitor);
walk_body(this, visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...has_side_effects = function (compressor){
return this.expression.has_side_effects(compressor)
|| any(this.body, compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Catch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.argname = props
.argname;}}n/a
function AST_Block(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Catch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.argname = props
.argname;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("catch");
output.space();
output.with_parens(function(){
self.argname.print(output);
});
output.space();
print_bracketed(self.body, output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.argname._walk(visitor);
walk_body(this, visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Conditional(props){ if (props) { this.end = props.end;this.start = props.start;this.alternative = props.alternative
;this.consequent = props.consequent;this.condition = props.condition;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Conditional(props){ if (props) { this.end = props.end;this.start = props.start;this.alternative = props.alternative
;this.consequent = props.consequent;this.condition = props.condition;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self.condition.print(output);
output.space();
output.print("?");
output.space();
self.consequent.print(output);
output.space();
output.colon();
self.alternative.print(output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._eq_null = function (pure_getters) {
return this.consequent._eq_null(pure_getters)
|| this.alternative._eq_null(pure_getters);
}...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
..._eval = function (compressor){
return ev(this.condition, compressor)
? ev(this.consequent, compressor)
: ev(this.alternative, compressor);
}...
// then its value is returned; otherwise the element itself
// is returned.
// They can be distinguished as constant value is never a
// descendant of AST_Node.
AST_Node.DEFMETHOD("evaluate", function(compressor){
if (!compressor.option("evaluate")) return this;
try {
var val = this._eval(compressor);
return !val || val instanceof RegExp || typeof val != "object" ? val : this;
} catch(ex) {
if (ex !== def) throw ex;
return this;
}
});
var unaryPrefix = makePredicate("! ~ - + void");
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.condition._walk(visitor);
this.consequent._walk(visitor);
this.alternative._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...drop_side_effect_free = function (compressor){
var consequent = this.consequent.drop_side_effect_free(compressor);
var alternative = this.alternative.drop_side_effect_free(compressor);
if (consequent === this.consequent && alternative === this.alternative) return this;
if (!consequent) return alternative ? make_node(AST_Binary, this, {
operator: "||",
left: this.condition,
right: alternative
}) : this.condition.drop_side_effect_free(compressor);
if (!alternative) return make_node(AST_Binary, this, {
operator: "&&",
left: this.condition,
right: consequent
});
var node = this.clone();
node.consequent = consequent;
node.alternative = alternative;
return node;
}...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...has_side_effects = function (compressor){
return this.condition.has_side_effects(compressor)
|| this.consequent.has_side_effects(compressor)
|| this.alternative.has_side_effects(compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...is_boolean = function (){
return this.consequent.is_boolean() && this.alternative.is_boolean();
}...
def(AST_Node, return_false);
def(AST_UnaryPrefix, function(){
return member(this.operator, unary_bool);
});
def(AST_Binary, function(){
return member(this.operator, binary_bool) ||
( (this.operator == "&&" || this.operator == "||") &&
this.left.is_boolean() && this.right.is_boolean() );
});
def(AST_Conditional, function(){
return this.consequent.is_boolean() && this.alternative.is_boolean();
});
def(AST_Assign, function(){
return this.operator == "=" && this.right.is_boolean();
});
...is_number = function (compressor){
return this.consequent.is_number(compressor) && this.alternative.is_number(compressor);
}...
var unary = makePredicate("+ - ~ ++ --");
def(AST_Unary, function(){
return unary(this.operator);
});
var binary = makePredicate("- * / % & | ^ << >> >>>");
def(AST_Binary, function(compressor){
return binary(this.operator) || this.operator == "+"
&& this.left.is_number(compressor)
&& this.right.is_number(compressor);
});
def(AST_Assign, function(compressor){
return binary(this.operator.slice(0, -1))
|| this.operator == "=" && this.right.is_number(compressor);
});
def(AST_Seq, function(compressor){
...is_string = function (compressor){
return this.consequent.is_string(compressor) && this.alternative.is_string(compressor);
}...
def(AST_Node, return_false);
def(AST_String, return_true);
def(AST_UnaryPrefix, function(){
return this.operator == "typeof";
});
def(AST_Binary, function(compressor){
return this.operator == "+" &&
(this.left.is_string(compressor) || this.right.is_string(compressor));
});
def(AST_Assign, function(compressor){
return (this.operator == "=" || this.operator == "+=") && this.right.is_string(compressor);
});
def(AST_Seq, function(compressor){
return this.cdr.is_string(compressor);
});
...needs_parens = function (output){
var p = output.parent();
// !(a = false) → true
if (p instanceof AST_Unary)
return true;
// 1 + (a = 2) + 3 → 6, side effect setting a = 2
if (p instanceof AST_Binary && !(p instanceof AST_Assign))
return true;
// (a = func)() —or— new (a = Object)()
if (p instanceof AST_Call && p.expression === this)
return true;
// (a = foo) ? bar : baz
if (p instanceof AST_Conditional && p.condition === this)
return true;
// (a = foo)["prop"] —or— (a = foo).prop
if (p instanceof AST_PropAccess && p.expression === this)
return true;
}...
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
if (self instanceof AST_Scope) {
use_asm = prev_use_asm;
...negate = function (compressor, first_in_statement){
return func.call(this, compressor, first_in_statement);
}...
continue loop;
}
//---
// if (foo()) return; [ else x... ]; y... ==> if (!foo()) { x...; y... }
if (!stat.body.value && in_lambda) {
CHANGED = true;
stat = stat.clone();
stat.condition = stat.condition.negate(compressor);
var body = as_statement_array(stat.alternative).concat(ret);
var funs = extract_functions_from_statement_array(body);
stat.body = make_node(AST_BlockStatement, stat, {
body: body
});
stat.alternative = null;
ret = funs.concat([ stat.transform(compressor) ]);
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Const(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions;}}n/a
function AST_Definitions(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions
;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Const(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self._do_print(output, "const");
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...function AST_Constant(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_String(props){ if (props) { this.end = props.end;this.start = props.start;this.quote = props.quote;this.value = props
.value;}}n/a
function AST_Number(props){ if (props) { this.end = props.end;this.start = props.start;this.literal = props.literal;this.value =
props.value;}}n/a
function AST_RegExp(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
function AST_Atom(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Constant(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print(self.getValue());
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...function return_false() { return false; }...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
..._eval = function (){
return this.getValue();
}...
// then its value is returned; otherwise the element itself
// is returned.
// They can be distinguished as constant value is never a
// descendant of AST_Node.
AST_Node.DEFMETHOD("evaluate", function(compressor){
if (!compressor.option("evaluate")) return this;
try {
var val = this._eval(compressor);
return !val || val instanceof RegExp || typeof val != "object" ? val : this;
} catch(ex) {
if (ex !== def) throw ex;
return this;
}
});
var unaryPrefix = makePredicate("! ~ - + void");
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...function return_null() { return null; }...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...getValue = function () {
return this.value;
}...
return node._eval(compressor);
};
def(AST_Node, function(){
throw def; // not constant
});
def(AST_Constant, function(){
return this.getValue();
});
def(AST_Array, function(compressor){
if (compressor.option("unsafe")) {
return this.elements.map(function(element) {
return ev(element, compressor);
});
}
...function return_false() { return false; }...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Continue(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}n/a
function AST_LoopControl(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Continue(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self._do_print(output, "continue");
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_DWLoop(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}n/a
function AST_IterationStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Do(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}n/a
function AST_While(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}n/a
function AST_DWLoop(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Debugger(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Statement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Debugger(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("debugger");
output.semicolon();
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Default(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_SwitchBranch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Default(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("default:");
self._do_print_body(output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...function AST_Definitions(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions
;}}n/a
function AST_Statement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Var(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions;}}n/a
function AST_Const(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions;}}n/a
function AST_Definitions(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions
;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._do_print = function (output, kind){
output.print(kind);
output.space();
this.definitions.forEach(function(def, i){
if (i) output.comma();
def.print(output);
});
var p = output.parent();
var in_for = p instanceof AST_For || p instanceof AST_ForIn;
var avoid_semicolon = in_for && p.init === this;
if (!avoid_semicolon)
output.semicolon();
}...
arg.print(output);
});
});
output.space();
print_bracketed(self.body, output, true);
});
DEFPRINT(AST_Lambda, function(self, output){
self._do_print(output);
});
/* -----[ exits ]----- */
AST_Exit.DEFMETHOD("_do_print", function(output, kind){
output.print(kind);
if (this.value) {
output.space();
..._walk = function (visitor) {
return visitor._visit(this, function(){
var definitions = this.definitions;
for (var i = 0, len = definitions.length; i < len; i++) {
definitions[i]._walk(visitor);
}
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...remove_initializers = function (){
this.definitions.forEach(function(def){ def.value = null });
}...
function extract_declarations_from_unreachable_code(compressor, stat, target) {
if (!(stat instanceof AST_Defun)) {
compressor.warn("Dropping unreachable code [{file}:{line},{col}]", stat.start);
}
stat.walk(new TreeWalker(function(node){
if (node instanceof AST_Definitions) {
compressor.warn("Declarations in unreachable code! [{file}:{line},{col}]", node.start);
node.remove_initializers();
target.push(node);
return true;
}
if (node instanceof AST_Defun) {
target.push(node);
return true;
}
...to_assignments = function (compressor){
var reduce_vars = compressor.option("reduce_vars");
var assignments = this.definitions.reduce(function(a, def){
if (def.value) {
var name = make_node(AST_SymbolRef, def.name, def.name);
a.push(make_node(AST_Assign, def, {
operator : "=",
left : name,
right : def.value
}));
if (reduce_vars) name.definition().fixed = false;
}
return a;
}, []);
if (assignments.length == 0) return null;
return AST_Seq.from_array(assignments);
}...
return make_node(AST_EmptyStatement, node);
}
if (node instanceof AST_Var && hoist_vars) {
node.definitions.forEach(function(def){
vars.set(def.name.name, def);
++vars_found;
});
var seq = node.to_assignments(compressor);
var p = tt.parent();
if (p instanceof AST_ForIn && p.init === node) {
if (seq == null) {
var def = node.definitions[0].name;
return make_node(AST_SymbolRef, def, def);
}
return seq;
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Defun(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props.
cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
function AST_Lambda(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Defun(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props.
cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function return_true() { return true; }...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Directive(props){ if (props) { this.end = props.end;this.start = props.start;this.quote = props.quote;this.scope =
props.scope;this.value = props.value;}}n/a
function AST_Statement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Directive(props){ if (props) { this.end = props.end;this.start = props.start;this.quote = props.quote;this.scope =
props.scope;this.value = props.value;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print_string(self.value, self.quote);
output.semicolon();
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Do(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}n/a
function AST_DWLoop(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Do(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("do");
output.space();
make_block(self.body, output);
output.space();
output.print("while");
output.space();
output.with_parens(function(){
self.condition.print(output);
});
output.semicolon();
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.body._walk(visitor);
this.condition._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Dot(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}n/a
function AST_PropAccess(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Dot(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
var expr = self.expression;
expr.print(output);
if (expr instanceof AST_Number && expr.getValue() >= 0) {
if (!/[xa-f.)]/i.test(output.last())) {
output.print(".");
}
}
output.print(".");
// the name after dot would be mapped about here.
output.add_mapping(self.end);
output.print_name(self.property);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._find_defs = function (compressor, suffix){
return this.expression._find_defs(compressor, "." + this.property + suffix);
}...
if (parent instanceof AST_Unary && unary_side_effects(parent.operator)) return parent.expression;
if (parent instanceof AST_Assign && parent.left === node) return node;
}
(function (def){
AST_Node.DEFMETHOD("resolve_defines", function(compressor) {
if (!compressor.option("global_defs")) return;
var def = this._find_defs(compressor, "");
if (def) {
var node, parent = this, level = 0;
do {
node = parent;
parent = compressor.parent(level++);
} while (parent instanceof AST_PropAccess && parent.expression === node);
if (is_lhs(node, parent)) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.expression._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...drop_side_effect_free = function (compressor, first_in_statement){
if (this.expression.may_eq_null(compressor)) return this;
return this.expression.drop_side_effect_free(compressor, first_in_statement);
}...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...has_side_effects = function (compressor){
return this.expression.may_eq_null(compressor)
|| this.expression.has_side_effects(compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_EmptyStatement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Statement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_EmptyStatement(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.semicolon();
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this);
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...function return_false() { return false; }...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Exit(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
function AST_Jump(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Return(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
function AST_Throw(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
function AST_Exit(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._do_print = function (output, kind){
output.print(kind);
if (this.value) {
output.space();
this.value.print(output);
}
output.semicolon();
}...
arg.print(output);
});
});
output.space();
print_bracketed(self.body, output, true);
});
DEFPRINT(AST_Lambda, function(self, output){
self._do_print(output);
});
/* -----[ exits ]----- */
AST_Exit.DEFMETHOD("_do_print", function(output, kind){
output.print(kind);
if (this.value) {
output.space();
..._walk = function (visitor) {
return visitor._visit(this, this.value && function(){
this.value._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_False(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Boolean(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_False(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function return_true() { return true; }...
def(AST_Node, return_false);
def(AST_UnaryPrefix, function(){
return member(this.operator, unary_bool);
});
def(AST_Binary, function(){
return member(this.operator, binary_bool) ||
( (this.operator == "&&" || this.operator == "||") &&
this.left.is_boolean() && this.right.is_boolean() );
});
def(AST_Conditional, function(){
return this.consequent.is_boolean() && this.alternative.is_boolean();
});
def(AST_Assign, function(){
return this.operator == "=" && this.right.is_boolean();
});
...function AST_Finally(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Block(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Finally(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("finally");
output.space();
print_bracketed(self.body, output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...function AST_For(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.step = props.step
;this.condition = props.condition;this.init = props.init;}}n/a
function AST_IterationStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_For(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.step = props.step
;this.condition = props.condition;this.init = props.init;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("for");
output.space();
output.with_parens(function(){
if (self.init) {
if (self.init instanceof AST_Definitions) {
self.init.print(output);
} else {
parenthesize_for_noin(self.init, output, true);
}
output.print(";");
output.space();
} else {
output.print(";");
}
if (self.condition) {
self.condition.print(output);
output.print(";");
output.space();
} else {
output.print(";");
}
if (self.step) {
self.step.print(output);
}
});
output.space();
self._do_print_body(output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
if (this.init) this.init._walk(visitor);
if (this.condition) this.condition._walk(visitor);
if (this.step) this.step._walk(visitor);
this.body._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_ForIn(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.object = props
.object;this.name = props.name;this.init = props.init;}}n/a
function AST_IterationStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_ForIn(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.object = props
.object;this.name = props.name;this.init = props.init;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("for");
output.space();
output.with_parens(function(){
self.init.print(output);
output.space();
output.print("in");
output.space();
self.object.print(output);
});
output.space();
self._do_print_body(output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.init._walk(visitor);
this.object._walk(visitor);
this.body._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Function(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
function AST_Lambda(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Function(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function return_false() { return false; }...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
...function return_null() { return null; }...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...function return_false() { return false; }...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...needs_parens = function (output){
if (first_in_statement(output)) {
return true;
}
if (output.option('wrap_iife')) {
var p = output.parent();
return p instanceof AST_Call && p.expression === this;
}
return false;
}...
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
if (self instanceof AST_Scope) {
use_asm = prev_use_asm;
...negate = function (compressor, first_in_statement){
return func.call(this, compressor, first_in_statement);
}...
continue loop;
}
//---
// if (foo()) return; [ else x... ]; y... ==> if (!foo()) { x...; y... }
if (!stat.body.value && in_lambda) {
CHANGED = true;
stat = stat.clone();
stat.condition = stat.condition.negate(compressor);
var body = as_statement_array(stat.alternative).concat(ret);
var funs = extract_functions_from_statement_array(body);
stat.body = make_node(AST_BlockStatement, stat, {
body: body
});
stat.alternative = null;
ret = funs.concat([ stat.transform(compressor) ]);
...next_mangled = function (options, def){
// #179, #326
// in Safari strict mode, something like (function x(x){...}) is a syntax error;
// a function expression's argument cannot shadow the function expression's name
var tricky_def = def.orig[0] instanceof AST_SymbolFunarg && this.name && this.name.definition();
// the function's mangled_name is null when keep_fnames is true
var tricky_name = tricky_def ? tricky_def.mangled_name || tricky_def.name : null;
while (true) {
var name = AST_Lambda.prototype.next_mangled.call(this, options, def);
if (!tricky_name || tricky_name != name)
return name;
}
}...
var sym = this.orig[0];
if (!options.screw_ie8 && sym instanceof AST_SymbolLambda)
s = s.parent_scope;
var def;
if (this.defun && (def = this.defun.variables.get(this.name))) {
this.mangled_name = def.mangled_name || def.name;
} else
this.mangled_name = s.next_mangled(options, this);
if (this.global && cache) {
cache.set(this.name, this.mangled_name);
}
}
}
};
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Hole(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Atom(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Hole(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function noop() {}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...function To_Moz_ArrayHole() { return null }...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_If(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.alternative = props
.alternative;this.condition = props.condition;}}n/a
function AST_StatementWithBody(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_If(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.alternative = props
.alternative;this.condition = props.condition;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("if");
output.space();
output.with_parens(function(){
self.condition.print(output);
});
output.space();
if (self.alternative) {
make_then(self, output);
output.space();
output.print("else");
output.space();
if (self.alternative instanceof AST_If)
self.alternative.print(output);
else
force_statement(self.alternative, output);
} else {
self._do_print_body(output);
}
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.condition._walk(visitor);
this.body._walk(visitor);
if (this.alternative) this.alternative._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...aborts = function (){
return this.alternative && aborts(this.body) && aborts(this.alternative) && this;
}...
});
})(function(node, func){
node.DEFMETHOD("has_side_effects", func);
});
// tell me if a statement aborts
function aborts(thing) {
return thing && thing.aborts();
};
(function(def){
def(AST_Statement, return_null);
def(AST_Jump, return_this);
function block_aborts(){
var n = this.body.length;
return n > 0 && aborts(this.body[n - 1]);
...has_side_effects = function (compressor){
return this.condition.has_side_effects(compressor)
|| this.body && this.body.has_side_effects(compressor)
|| this.alternative && this.alternative.has_side_effects(compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Infinity(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Atom(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Infinity(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...function AST_IterationStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_StatementWithBody(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_DWLoop(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}n/a
function AST_For(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.step = props.step
;this.condition = props.condition;this.init = props.init;}}n/a
function AST_ForIn(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.object = props
.object;this.name = props.name;this.init = props.init;}}n/a
function AST_IterationStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function AST_Jump(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Statement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Exit(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
function AST_LoopControl(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}n/a
function AST_Jump(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function return_this() { return this; }...
});
})(function(node, func){
node.DEFMETHOD("has_side_effects", func);
});
// tell me if a statement aborts
function aborts(thing) {
return thing && thing.aborts();
};
(function(def){
def(AST_Statement, return_null);
def(AST_Jump, return_this);
function block_aborts(){
var n = this.body.length;
return n > 0 && aborts(this.body[n - 1]);
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...function AST_Label(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;this.references = props.references;this.initialize();}}n/a
function AST_Symbol(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Label(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;this.references = props.references;this.initialize();}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...initialize = function () {
this.references = [];
this.thedef = this;
}...
props = props.concat(base.PROPS);
var code = "return function AST_" + type + "(props){ if (props) { ";
for (var i = props.length; --i >= 0;) {
code += "this." + props[i] + " = props." + props[i] + ";";
}
var proto = base && new base;
if (proto && proto.initialize || (methods && methods.initialize))
code += "this.initialize();";
code += "}}";
var ctor = new Function(code)();
if (proto) {
ctor.prototype = proto;
ctor.BASE = base;
}
if (base) base.SUBCLASSES.push(ctor);
...undeclared = function (){
return false;
}...
|| this.alternative.has_side_effects(compressor);
});
def(AST_Unary, function(compressor){
return unary_side_effects(this.operator)
|| this.expression.has_side_effects(compressor);
});
def(AST_SymbolRef, function(compressor){
return this.undeclared();
});
def(AST_Object, function(compressor){
return any(this.properties, compressor);
});
def(AST_ObjectProperty, function(compressor){
return this.value.has_side_effects(compressor);
});
...unmangleable = function (){
return false;
}...
|| this.orig[0] instanceof AST_SymbolDefun));
},
mangle: function(options) {
var cache = options.cache && options.cache.props;
if (this.global && cache && cache.has(this.name)) {
this.mangled_name = cache.get(this.name);
}
else if (!this.mangled_name && !this.unmangleable(options)) {
var s = this.scope;
var sym = this.orig[0];
if (!options.screw_ie8 && sym instanceof AST_SymbolLambda)
s = s.parent_scope;
var def;
if (this.defun && (def = this.defun.variables.get(this.name))) {
this.mangled_name = def.mangled_name || def.name;
...function AST_LabelRef(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name =
props.name;this.scope = props.scope;}}n/a
function AST_Symbol(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_LabelRef(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name =
props.name;this.scope = props.scope;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...undeclared = function (){
return false;
}...
|| this.alternative.has_side_effects(compressor);
});
def(AST_Unary, function(compressor){
return unary_side_effects(this.operator)
|| this.expression.has_side_effects(compressor);
});
def(AST_SymbolRef, function(compressor){
return this.undeclared();
});
def(AST_Object, function(compressor){
return any(this.properties, compressor);
});
def(AST_ObjectProperty, function(compressor){
return this.value.has_side_effects(compressor);
});
...function AST_LabeledStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.label
= props.label;}}n/a
function AST_StatementWithBody(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_LabeledStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.label
= props.label;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self.label.print(output);
output.colon();
self.body.print(output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.label._walk(visitor);
this.body._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...clone = function (deep) {
var node = this._clone(deep);
if (deep) {
var refs = node.label.references;
var label = this.label;
node.walk(new TreeWalker(function(node) {
if (node instanceof AST_LoopControl
&& node.label && node.label.thedef === label) {
refs.push(node);
}
}));
}
return node;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
...has_side_effects = function (compressor){
return this.body.has_side_effects(compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Lambda(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
function AST_Scope(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props.
cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Accessor(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
function AST_Function(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
function AST_Defun(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props.
cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
function AST_Lambda(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self._do_print(output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._do_print = function (output, nokeyword){
var self = this;
if (!nokeyword) {
output.print("function");
}
if (self.name) {
output.space();
self.name.print(output);
}
output.with_parens(function(){
self.argnames.forEach(function(arg, i){
if (i) output.comma();
arg.print(output);
});
});
output.space();
print_bracketed(self.body, output, true);
}...
arg.print(output);
});
});
output.space();
print_bracketed(self.body, output, true);
});
DEFPRINT(AST_Lambda, function(self, output){
self._do_print(output);
});
/* -----[ exits ]----- */
AST_Exit.DEFMETHOD("_do_print", function(output, kind){
output.print(kind);
if (this.value) {
output.space();
..._eval = function (){
throw def;
}...
// then its value is returned; otherwise the element itself
// is returned.
// They can be distinguished as constant value is never a
// descendant of AST_Node.
AST_Node.DEFMETHOD("evaluate", function(compressor){
if (!compressor.option("evaluate")) return this;
try {
var val = this._eval(compressor);
return !val || val instanceof RegExp || typeof val != "object" ? val : this;
} catch(ex) {
if (ex !== def) throw ex;
return this;
}
});
var unaryPrefix = makePredicate("! ~ - + void");
..._walk = function (visitor) {
return visitor._visit(this, function(){
if (this.name) this.name._walk(visitor);
var argnames = this.argnames;
for (var i = 0, len = argnames.length; i < len; i++) {
argnames[i]._walk(visitor);
}
walk_body(this, visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...init_scope_vars = function (){
AST_Scope.prototype.init_scope_vars.apply(this, arguments);
this.uses_arguments = false;
this.def_variable(new AST_SymbolVar({
name: "arguments",
start: this.start,
end: this.end
}));
}...
var scope = self.parent_scope = null;
var labels = new Dictionary();
var defun = null;
var tw = new TreeWalker(function(node, descend){
if (node instanceof AST_Catch) {
var save_scope = scope;
scope = new AST_Scope(node);
scope.init_scope_vars(save_scope);
descend();
scope = save_scope;
return true;
}
if (node instanceof AST_Scope) {
node.init_scope_vars(scope);
var save_scope = scope;
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_LoopControl(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}n/a
function AST_Jump(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Break(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}n/a
function AST_Continue(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}n/a
function AST_LoopControl(props){ if (props) { this.end = props.end;this.start = props.start;this.label = props.label;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._do_print = function (output, kind){
output.print(kind);
if (this.label) {
output.space();
this.label.print(output);
}
output.semicolon();
}...
arg.print(output);
});
});
output.space();
print_bracketed(self.body, output, true);
});
DEFPRINT(AST_Lambda, function(self, output){
self._do_print(output);
});
/* -----[ exits ]----- */
AST_Exit.DEFMETHOD("_do_print", function(output, kind){
output.print(kind);
if (this.value) {
output.space();
..._walk = function (visitor) {
return visitor._visit(this, this.label && function(){
this.label._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_NaN(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Atom(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_NaN(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...function AST_New(props){ if (props) { this.end = props.end;this.start = props.start;this.args = props.args;this.expression = props
.expression;}}n/a
function AST_Call(props){ if (props) { this.end = props.end;this.start = props.start;this.args = props.args;this.expression = props
.expression;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_New(props){ if (props) { this.end = props.end;this.start = props.start;this.args = props.args;this.expression = props
.expression;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...needs_parens = function (output){
var p = output.parent();
if (!need_constructor_parens(this, output)
&& (p instanceof AST_PropAccess // (new Date).getTime(), (new Date)["getTime"]()
|| p instanceof AST_Call && p.expression === this)) // (new foo)(bar)
return true;
}...
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
if (self instanceof AST_Scope) {
use_asm = prev_use_asm;
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...from_mozilla_ast = function (node){
var save_stack = FROM_MOZ_STACK;
FROM_MOZ_STACK = [];
var ast = from_moz(node);
FROM_MOZ_STACK = save_stack;
return ast;
}...
JavaScript ASTs in SpiderMonkey format.
Example:
```javascript
function uglify(ast, options, mangle) {
// Conversion from SpiderMonkey AST to internal format
var uAST = UglifyJS.AST_Node.from_mozilla_ast(ast);
// Compression
uAST.figure_out_scope();
uAST = UglifyJS.Compressor(options).compress(uAST);
// Mangling (optional)
if (mangle) {
...warn = function (txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
}...
stat.definitions.forEach(function(def) {
if (def.value && def.value instanceof AST_Lambda) {
a.push(make_injector(def.value, def.name));
}
});
}
else {
compressor.warn("Unknown statement marked with @ngInject [{file
}:{line},{col}]", token);
}
}
}
}
return a;
}, []);
...warn_function = function (txt) {
console.error("WARN: %s", txt);
}...
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
};
/* -----[ statements ]----- */
var AST_Statement = DEFNODE("Statement", null, {
$documentation: "Base class of all statements",
});
...function AST_Statement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_VarDef(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.name = props
.name;}}n/a
function AST_ObjectProperty(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key
= props.key;}}n/a
function AST_Symbol(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}n/a
function AST_Constant(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Call(props){ if (props) { this.end = props.end;this.start = props.start;this.args = props.args;this.expression = props
.expression;}}n/a
function AST_Seq(props){ if (props) { this.end = props.end;this.start = props.start;this.cdr = props.cdr;this.car = props.car;}}n/a
function AST_PropAccess(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}n/a
function AST_Unary(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;this.operator
= props.operator;}}n/a
function AST_Binary(props){ if (props) { this.end = props.end;this.start = props.start;this.right = props.right;this.operator =
props.operator;this.left = props.left;}}n/a
function AST_Conditional(props){ if (props) { this.end = props.end;this.start = props.start;this.alternative = props.alternative
;this.consequent = props.consequent;this.condition = props.condition;}}n/a
function AST_Array(props){ if (props) { this.end = props.end;this.start = props.start;this.elements = props.elements;}}n/a
function AST_Object(props){ if (props) { this.end = props.end;this.start = props.start;this.properties = props.properties;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._clone = function (deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
}...
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
...function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
..._eval = function (){
throw def; // not constant
}...
// then its value is returned; otherwise the element itself
// is returned.
// They can be distinguished as constant value is never a
// descendant of AST_Node.
AST_Node.DEFMETHOD("evaluate", function(compressor){
if (!compressor.option("evaluate")) return this;
try {
var val = this._eval(compressor);
return !val || val instanceof RegExp || typeof val != "object" ? val : this;
} catch(ex) {
if (ex !== def) throw ex;
return this;
}
});
var unaryPrefix = makePredicate("! ~ - + void");
...function noop() {}...
if (parent instanceof AST_Unary && unary_side_effects(parent.operator)) return parent.expression;
if (parent instanceof AST_Assign && parent.left === node) return node;
}
(function (def){
AST_Node.DEFMETHOD("resolve_defines", function(compressor) {
if (!compressor.option("global_defs")) return;
var def = this._find_defs(compressor, "");
if (def) {
var node, parent = this, level = 0;
do {
node = parent;
parent = compressor.parent(level++);
} while (parent instanceof AST_PropAccess && parent.expression === node);
if (is_lhs(node, parent)) {
..._walk = function (visitor) {
return visitor._visit(this);
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...add_comments = function (output){
if (output._readonly) return;
var self = this;
var start = self.start;
if (start && !start._comments_dumped) {
start._comments_dumped = true;
var comments = start.comments_before || [];
// XXX: ugly fix for https://github.com/mishoo/UglifyJS2/issues/112
// and https://github.com/mishoo/UglifyJS2/issues/372
if (self instanceof AST_Exit && self.value) {
self.value.walk(new TreeWalker(function(node){
if (node.start && node.start.comments_before) {
comments = comments.concat(node.start.comments_before);
node.start.comments_before = [];
}
if (node instanceof AST_Function ||
node instanceof AST_Array ||
node instanceof AST_Object)
{
return true; // don't go inside.
}
}));
}
if (output.pos() == 0) {
if (comments.length > 0 && output.option("shebang") && comments[0].type == "comment5") {
output.print("#!" + comments.shift().value + "\n");
output.indent();
}
var preamble = output.option("preamble");
if (preamble) {
output.print(preamble.replace(/\r\n?|[\n\u2028\u2029]|\s*$/g, "\n"));
}
}
comments = comments.filter(output.comment_filter, self);
// Keep single line comments after nlb, after nlb
if (!output.option("beautify") && comments.length > 0 &&
/comment[134]/.test(comments[0].type) &&
output.col() !== 0 && comments[0].nlb)
{
output.print("\n");
}
comments.forEach(function(c){
if (/comment[134]/.test(c.type)) {
output.print("//" + c.value + "\n");
output.indent();
}
else if (c.type == "comment2") {
output.print("/*" + c.value + "*/");
if (start.nlb) {
output.print("\n");
output.indent();
} else {
output.space();
}
}
});
}
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...clone = function (deep) {
return this._clone(deep);
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
...constant_value = function (compressor){
// Accomodate when option evaluate=false.
if (this instanceof AST_Constant && !(this instanceof AST_RegExp)) {
return this.value;
}
// Accomodate the common constant expressions !0 and -1 when option evaluate=false.
if (this instanceof AST_UnaryPrefix
&& this.expression instanceof AST_Constant) switch (this.operator) {
case "!":
return !this.expression.value;
case "~":
return ~this.expression.value;
case "-":
return -this.expression.value;
case "+":
return +this.expression.value;
default:
throw new Error(string_template("Cannot evaluate unary expression {value}", {
value: this.print_to_string()
}));
}
var result = this.evaluate(compressor);
if (result !== this) {
return result;
}
throw new Error(string_template("Cannot evaluate constant [{file}:{line},{col}]", this.start));
}n/a
function return_this() { return this; }...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...equivalent_to = function (node){
return this.TYPE == node.TYPE && this.print_to_string() == node.print_to_string();
}...
eliminate_branch(branch, body[body.length - 1]);
continue;
}
}
if (aborts(branch)) {
var prev = body[body.length - 1];
if (aborts(prev) && prev.body.length == branch.body.length
&& make_node(AST_BlockStatement, prev, prev).equivalent_to(make_node
(AST_BlockStatement, branch, branch))) {
prev.body = [];
}
}
body.push(branch);
}
while (i < len) eliminate_branch(self.body[i++], body[body.length - 1]);
if (body.length > 0) {
...evaluate = function (compressor){
if (!compressor.option("evaluate")) return this;
try {
var val = this._eval(compressor);
return !val || val instanceof RegExp || typeof val != "object" ? val : this;
} catch(ex) {
if (ex !== def) throw ex;
return this;
}
}...
case "+":
return +this.expression.value;
default:
throw new Error(string_template("Cannot evaluate unary expression {value}", {
value: this.print_to_string()
}));
}
var result = this.evaluate(compressor);
if (result !== this) {
return result;
}
throw new Error(string_template("Cannot evaluate constant [{file}:{line},{col}]", this.start));
});
def(AST_Statement, function(){
throw new Error(string_template("Cannot evaluate a statement [{file}:{line},{col}]", this.start));
...function return_true() { return true; }...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...function return_false() { return false; }...
def(AST_Node, return_false);
def(AST_UnaryPrefix, function(){
return member(this.operator, unary_bool);
});
def(AST_Binary, function(){
return member(this.operator, binary_bool) ||
( (this.operator == "&&" || this.operator == "||") &&
this.left.is_boolean() && this.right.is_boolean() );
});
def(AST_Conditional, function(){
return this.consequent.is_boolean() && this.alternative.is_boolean();
});
def(AST_Assign, function(){
return this.operator == "=" && this.right.is_boolean();
});
...is_constant = function (){
// Accomodate when compress option evaluate=false
// as well as the common constant expressions !0 and -1
if (this instanceof AST_Constant) {
return !(this instanceof AST_RegExp);
} else {
return this instanceof AST_UnaryPrefix
&& this.expression instanceof AST_Constant
&& unaryPrefix(this.operator);
}
}...
}
var ref = def.references[0];
// Don't replace ref if eval() or with statement in scope.
if (ref.scope.uses_eval || ref.scope.uses_with) break;
// Constant single use vars can be replaced in any scope.
if (var_decl.value.is_constant()) {
var ctt = new TreeTransformer(function(node) {
var parent = ctt.parent();
if (parent instanceof AST_IterationStatement
&& (parent.condition === node || parent.init === node)) {
return node;
}
if (node === ref)
...function return_false() { return false; }...
var unary = makePredicate("+ - ~ ++ --");
def(AST_Unary, function(){
return unary(this.operator);
});
var binary = makePredicate("- * / % & | ^ << >> >>>");
def(AST_Binary, function(compressor){
return binary(this.operator) || this.operator == "+"
&& this.left.is_number(compressor)
&& this.right.is_number(compressor);
});
def(AST_Assign, function(compressor){
return binary(this.operator.slice(0, -1))
|| this.operator == "=" && this.right.is_number(compressor);
});
def(AST_Seq, function(compressor){
...function return_false() { return false; }...
def(AST_Node, return_false);
def(AST_String, return_true);
def(AST_UnaryPrefix, function(){
return this.operator == "typeof";
});
def(AST_Binary, function(compressor){
return this.operator == "+" &&
(this.left.is_string(compressor) || this.right.is_string(compressor));
});
def(AST_Assign, function(compressor){
return (this.operator == "=" || this.operator == "+=") && this.right.is_string(compressor);
});
def(AST_Seq, function(compressor){
return this.cdr.is_string(compressor);
});
...may_eq_null = function (compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
}...
def(AST_ObjectProperty, function(compressor){
return this.value.has_side_effects(compressor);
});
def(AST_Array, function(compressor){
return any(this.elements, compressor);
});
def(AST_Dot, function(compressor){
return this.expression.may_eq_null(compressor)
|| this.expression.has_side_effects(compressor);
});
def(AST_Sub, function(compressor){
return this.expression.may_eq_null(compressor)
|| this.expression.has_side_effects(compressor)
|| this.property.has_side_effects(compressor);
});
...needs_parens = function (){
return false;
}...
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
if (self instanceof AST_Scope) {
use_asm = prev_use_asm;
...negate = function (compressor, first_in_statement){
return func.call(this, compressor, first_in_statement);
}...
continue loop;
}
//---
// if (foo()) return; [ else x... ]; y... ==> if (!foo()) { x...; y... }
if (!stat.body.value && in_lambda) {
CHANGED = true;
stat = stat.clone();
stat.condition = stat.condition.negate(compressor);
var body = as_statement_array(stat.alternative).concat(ret);
var funs = extract_functions_from_statement_array(body);
stat.body = make_node(AST_BlockStatement, stat, {
body: body
});
stat.alternative = null;
ret = funs.concat([ stat.transform(compressor) ]);
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...print = function (stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
if (self instanceof AST_Scope) {
use_asm = prev_use_asm;
}
}...
#### Generating output
AST nodes have a `print` method that takes an output stream. Essentially,
to generate code you do this:
```javascript
var stream = UglifyJS.OutputStream(options);
compressed_ast.print(stream);
var code = stream.toString(); // this is your minified code
```
or, for a shortcut you can do:
```javascript
var code = compressed_ast.print_to_string(options);
```
...print_to_string = function (options){
var s = OutputStream(options);
if (!options) s._readonly = true;
this.print(s);
return s.get();
}...
var stream = UglifyJS.OutputStream(options);
compressed_ast.print(stream);
var code = stream.toString(); // this is your minified code
```
or, for a shortcut you can do:
```javascript
var code = compressed_ast.print_to_string(options);
```
As usual, `options` is optional. The output stream accepts a lot of options,
most of them documented above in section “Beautifier options”. The two
which we care about here are `source_map` and `comments`.
#### Keeping comments in the output
...process_expression = function (insert, compressor) {
var self = this;
var tt = new TreeTransformer(function(node) {
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
expression: make_node(AST_Number, node, {
value: 0
})
})
});
}
if (node instanceof AST_Lambda && node !== self) {
return node;
}
if (node instanceof AST_Block) {
var index = node.body.length - 1;
if (index >= 0) {
node.body[index] = node.body[index].transform(tt);
}
}
if (node instanceof AST_If) {
node.body = node.body.transform(tt);
if (node.alternative) {
node.alternative = node.alternative.transform(tt);
}
}
if (node instanceof AST_With) {
node.body = node.body.transform(tt);
}
return node;
});
return self.transform(tt);
}...
};
Compressor.prototype = new TreeTransformer;
merge(Compressor.prototype, {
option: function(key) { return this.options[key] },
compress: function(node) {
if (this.option("expression")) {
node = node.process_expression(true);
}
var passes = +this.options.passes || 1;
for (var pass = 0; pass < passes && pass < 3; ++pass) {
if (pass > 0 || this.option("reduce_vars"))
node.reset_opt_flags(this, true);
node = node.transform(this);
}
...reset_opt_flags = function (compressor, rescan){
var reduce_vars = rescan && compressor.option("reduce_vars");
var toplevel = compressor.option("toplevel");
var safe_ids = Object.create(null);
var suppressor = new TreeWalker(function(node) {
if (node instanceof AST_Symbol) {
var d = node.definition();
if (node instanceof AST_SymbolRef) d.references.push(node);
d.fixed = false;
}
});
var tw = new TreeWalker(function(node, descend){
node._squeezed = false;
node._optimized = false;
if (reduce_vars) {
if (node instanceof AST_Toplevel) node.globals.each(reset_def);
if (node instanceof AST_Scope) node.variables.each(reset_def);
if (node instanceof AST_SymbolRef) {
var d = node.definition();
d.references.push(node);
if (d.fixed === undefined || !is_safe(d)
|| is_modified(node, 0, node.fixed_value() instanceof AST_Lambda)) {
d.fixed = false;
}
}
if (node instanceof AST_SymbolCatch) {
node.definition().fixed = false;
}
if (node instanceof AST_VarDef) {
var d = node.name.definition();
if (d.fixed == null) {
if (node.value) {
d.fixed = function() {
return node.value;
};
mark(d, false);
descend();
} else {
d.fixed = null;
}
mark(d, true);
return true;
} else if (node.value) {
d.fixed = false;
}
}
if (node instanceof AST_Defun) {
var d = node.name.definition();
if (!toplevel && d.global || is_safe(d)) {
d.fixed = false;
} else {
d.fixed = node;
mark(d, true);
}
var save_ids = safe_ids;
safe_ids = Object.create(null);
descend();
safe_ids = save_ids;
return true;
}
var iife;
if (node instanceof AST_Function
&& !node.name
&& (iife = tw.parent()) instanceof AST_Call
&& iife.expression === node) {
// Virtually turn IIFE parameters into variable definitions:
// (function(a,b) {...})(c,d) => (function() {var a=c,b=d; ...})()
// So existing transformation rules can work on them.
node.argnames.forEach(function(arg, i) {
var d = arg.definition();
d.fixed = function() {
return iife.args[i] || make_node(AST_Undefined, iife);
};
mark(d, true);
});
}
if (node instanceof AST_If || node instanceof AST_DWLoop) {
node.condition.walk(tw);
push();
node.body.walk(tw);
pop();
if (node.alternative) {
push();
node.alternative.walk(tw);
pop();
}
return true;
}
if (node instanceof AST_LabeledStatement) {
push();
node.body.walk(tw);
pop();
return true;
}
if (node instanceof AST_For) {
if (node.init) node.init.walk(tw);
push();
if (node.condition) node.condition.walk(tw);
node.body.walk(tw);
if (node.step) node.step.walk(tw);
pop();
return true;
}
if (node instanceof AST_ForIn) {
node.init.walk(suppressor); ......
compress: function(node) {
if (this.option("expression")) {
node = node.process_expression(true);
}
var passes = +this.options.passes || 1;
for (var pass = 0; pass < passes && pass < 3; ++pass) {
if (pass > 0 || this.option("reduce_vars"))
node.reset_opt_flags(this, true);
node = node.transform(this);
}
if (this.option("expression")) {
node = node.process_expression(false);
}
return node;
},
...resolve_defines = function (compressor) {
if (!compressor.option("global_defs")) return;
var def = this._find_defs(compressor, "");
if (def) {
var node, parent = this, level = 0;
do {
node = parent;
parent = compressor.parent(level++);
} while (parent instanceof AST_PropAccess && parent.expression === node);
if (is_lhs(node, parent)) {
compressor.warn('global_defs ' + this.print_to_string() + ' redefined [{file}:{line},{col}]', this.start);
} else {
return def;
}
}
}...
ev = make_node_from_constant(ev, self).optimize(compressor);
return best_of(compressor, ev, self);
}
return self;
});
OPT(AST_SymbolRef, function(self, compressor){
var def = self.resolve_defines(compressor);
if (def) {
return def.optimize(compressor);
}
// testing against !self.scope.uses_with first is an optimization
if (compressor.option("screw_ie8")
&& self.undeclared()
&& (!self.scope.uses_with || !compressor.find_parent(AST_With))) {
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...walk = function (visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}...
console.log("%s", JSON.stringify(output, null, 2));
}
function getProps(filename) {
var code = fs.readFileSync(filename, "utf8");
var ast = U2.parse(code);
ast.walk(new U2.TreeWalker(function(node){
if (node instanceof U2.AST_ObjectKeyVal) {
add(node.key);
}
else if (node instanceof U2.AST_ObjectProperty) {
add(node.key.name);
}
else if (node instanceof U2.AST_Dot) {
...function AST_Null(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Atom(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Null(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function return_true() { return true; }...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Number(props){ if (props) { this.end = props.end;this.start = props.start;this.literal = props.literal;this.value =
props.value;}}n/a
function AST_Constant(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Number(props){ if (props) { this.end = props.end;this.start = props.start;this.literal = props.literal;this.value =
props.value;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
if (use_asm && self.start && self.start.raw != null) {
output.print(self.start.raw);
} else {
output.print(make_num(self.getValue()));
}
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...function return_true() { return true; }...
var unary = makePredicate("+ - ~ ++ --");
def(AST_Unary, function(){
return unary(this.operator);
});
var binary = makePredicate("- * / % & | ^ << >> >>>");
def(AST_Binary, function(compressor){
return binary(this.operator) || this.operator == "+"
&& this.left.is_number(compressor)
&& this.right.is_number(compressor);
});
def(AST_Assign, function(compressor){
return binary(this.operator.slice(0, -1))
|| this.operator == "=" && this.right.is_number(compressor);
});
def(AST_Seq, function(compressor){
...needs_parens = function (output){
var p = output.parent();
if (p instanceof AST_PropAccess && p.expression === this) {
var value = this.getValue();
if (value < 0 || /^0/.test(make_num(value))) {
return true;
}
}
}...
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
if (self instanceof AST_Scope) {
use_asm = prev_use_asm;
...function AST_Object(props){ if (props) { this.end = props.end;this.start = props.start;this.properties = props.properties;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Object(props){ if (props) { this.end = props.end;this.start = props.start;this.properties = props.properties;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
if (self.properties.length > 0) output.with_block(function(){
self.properties.forEach(function(prop, i){
if (i) {
output.print(",");
output.newline();
}
output.indent();
prop.print(output);
});
output.newline();
});
else output.print("{}");
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...function return_false() { return false; }...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
..._eval = function (compressor){
if (compressor.option("unsafe")) {
var val = {};
for (var i = 0, len = this.properties.length; i < len; i++) {
var prop = this.properties[i];
var key = prop.key;
if (key instanceof AST_Symbol) {
key = key.name;
} else if (key instanceof AST_Node) {
key = ev(key, compressor);
}
if (typeof Object.prototype[key] === 'function') {
throw def;
}
val[key] = ev(prop.value, compressor);
}
return val;
}
throw def;
}...
// then its value is returned; otherwise the element itself
// is returned.
// They can be distinguished as constant value is never a
// descendant of AST_Node.
AST_Node.DEFMETHOD("evaluate", function(compressor){
if (!compressor.option("evaluate")) return this;
try {
var val = this._eval(compressor);
return !val || val instanceof RegExp || typeof val != "object" ? val : this;
} catch(ex) {
if (ex !== def) throw ex;
return this;
}
});
var unaryPrefix = makePredicate("! ~ - + void");
..._walk = function (visitor) {
return visitor._visit(this, function(){
var properties = this.properties;
for (var i = 0, len = properties.length; i < len; i++) {
properties[i]._walk(visitor);
}
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...drop_side_effect_free = function (compressor, first_in_statement){
var values = trim(this.properties, compressor, first_in_statement);
return values && AST_Seq.from_array(values);
}...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...has_side_effects = function (compressor){
return any(this.properties, compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...needs_parens = function (output){
return first_in_statement(output);
}...
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
if (self instanceof AST_Scope) {
use_asm = prev_use_asm;
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_ObjectGetter(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key =
props.key;}}n/a
function AST_ObjectProperty(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key
= props.key;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_ObjectGetter(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key =
props.key;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("get");
output.space();
self.key.print(output);
self.value._do_print(output, true);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...function AST_ObjectKeyVal(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key =
props.key;this.quote = props.quote;}}n/a
function AST_ObjectProperty(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key
= props.key;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_ObjectKeyVal(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key =
props.key;this.quote = props.quote;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
var key = self.key;
var quote = self.quote;
if (output.option("quote_keys")) {
output.print_string(key + "");
} else if ((typeof key == "number"
|| !output.option("beautify")
&& +key + "" == key)
&& parseFloat(key) >= 0) {
output.print(make_num(key));
} else if (RESERVED_WORDS(key) ? output.option("screw_ie8") : is_identifier_string(key)) {
if (quote && output.option("keep_quoted_props")) {
output.print_string(key, quote);
} else {
output.print_name(key);
}
} else {
output.print_string(key, quote);
}
output.colon();
self.value.print(output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...function AST_ObjectProperty(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key
= props.key;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_ObjectKeyVal(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key =
props.key;this.quote = props.quote;}}n/a
function AST_ObjectSetter(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key =
props.key;}}n/a
function AST_ObjectGetter(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key =
props.key;}}n/a
function AST_ObjectProperty(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key
= props.key;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.value._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...drop_side_effect_free = function (compressor, first_in_statement){
return this.value.drop_side_effect_free(compressor, first_in_statement);
}...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...has_side_effects = function (compressor){
return this.value.has_side_effects(compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_ObjectSetter(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key =
props.key;}}n/a
function AST_ObjectProperty(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key
= props.key;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_ObjectSetter(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.key =
props.key;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("set");
output.space();
self.key.print(output);
self.value._do_print(output, true);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...function AST_PropAccess(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Dot(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}n/a
function AST_Sub(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}n/a
function AST_PropAccess(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._eval = function (compressor){
if (compressor.option("unsafe")) {
var key = this.property;
if (key instanceof AST_Node) {
key = ev(key, compressor);
}
var val = ev(this.expression, compressor);
if (val && HOP(val, key)) {
return val[key];
}
}
throw def;
}...
// then its value is returned; otherwise the element itself
// is returned.
// They can be distinguished as constant value is never a
// descendant of AST_Node.
AST_Node.DEFMETHOD("evaluate", function(compressor){
if (!compressor.option("evaluate")) return this;
try {
var val = this._eval(compressor);
return !val || val instanceof RegExp || typeof val != "object" ? val : this;
} catch(ex) {
if (ex !== def) throw ex;
return this;
}
});
var unaryPrefix = makePredicate("! ~ - + void");
...needs_parens = function (output){
var p = output.parent();
if (p instanceof AST_New && p.expression === this) {
// i.e. new (foo.bar().baz)
//
// if there's one call into this subtree, then we need
// parens around it too, otherwise the call will be
// interpreted as passing the arguments to the upper New
// expression.
try {
this.walk(new TreeWalker(function(node){
if (node instanceof AST_Call) throw p;
}));
} catch(ex) {
if (ex !== p) throw ex;
return true;
}
}
}...
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
if (self instanceof AST_Scope) {
use_asm = prev_use_asm;
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_RegExp(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
function AST_Constant(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_RegExp(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
var str = self.getValue().toString();
if (output.option("ascii_only")) {
str = output.to_ascii(str);
} else if (output.option("unescape_regexps")) {
str = str.split("\\\\").map(function(str){
return str.replace(/\\u[0-9a-fA-F]{4}|\\x[0-9a-fA-F]{2}/g, function(s){
var code = parseInt(s.substr(2), 16);
return regexp_safe_literal(code) ? String.fromCharCode(code) : s;
});
}).join("\\\\");
}
output.print(str);
var p = output.parent();
if (p instanceof AST_Binary && /^in/.test(p.operator) && p.left === self)
output.print(" ");
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Return(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
function AST_Exit(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Return(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self._do_print(output, "return");
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Scope(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props.
cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;}}n/a
function AST_Block(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Toplevel(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.globals = props
.globals;}}n/a
function AST_Lambda(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.uses_arguments
= props.uses_arguments;this.argnames = props.argnames;this.name = props.name;}}n/a
function AST_Scope(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props.
cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...def_function = function (symbol){
this.functions.set(symbol.name, this.def_variable(symbol));
}...
node.scope = scope;
}
if (node instanceof AST_Label) {
node.thedef = node;
node.references = [];
}
if (node instanceof AST_SymbolLambda) {
defun.def_function(node);
}
else if (node instanceof AST_SymbolDefun) {
// Careful here, the scope where this should be defined is
// the parent scope. The reason is that we enter a new
// scope when we encounter the AST_Defun node (which is
// instanceof AST_Scope) but we get to the symbol a bit
// later.
...def_variable = function (symbol){
var def;
if (!this.variables.has(symbol.name)) {
def = new SymbolDef(this, this.variables.size(), symbol);
this.variables.set(symbol.name, def);
def.global = !this.parent_scope;
} else {
def = this.variables.get(symbol.name);
def.orig.push(symbol);
}
return symbol.thedef = def;
}...
// scope when we encounter the AST_Defun node (which is
// instanceof AST_Scope) but we get to the symbol a bit
// later.
(node.scope = defun.parent_scope).def_function(node);
}
else if (node instanceof AST_SymbolVar
|| node instanceof AST_SymbolConst) {
defun.def_variable(node);
if (defun !== scope) {
node.mark_enclosed(options);
var def = scope.find_variable(node);
if (node.thedef !== def) {
node.thedef = def;
node.reference(options);
}
...drop_unused = function (compressor){
var self = this;
if (compressor.has_directive("use asm")) return self;
var toplevel = compressor.option("toplevel");
if (compressor.option("unused")
&& (!(self instanceof AST_Toplevel) || toplevel)
&& !self.uses_eval
&& !self.uses_with) {
var assign_as_unused = !/keep_assign/.test(compressor.option("unused"));
var drop_funcs = /funcs/.test(toplevel);
var drop_vars = /vars/.test(toplevel);
if (!(self instanceof AST_Toplevel) || toplevel == true) {
drop_funcs = drop_vars = true;
}
var in_use = [];
var in_use_ids = Object.create(null); // avoid expensive linear scans of in_use
if (self instanceof AST_Toplevel && compressor.top_retain) {
self.variables.each(function(def) {
if (compressor.top_retain(def) && !(def.id in in_use_ids)) {
in_use_ids[def.id] = true;
in_use.push(def);
}
});
}
var initializations = new Dictionary();
// pass 1: find out which symbols are directly used in
// this scope (not in nested scopes).
var scope = this;
var tw = new TreeWalker(function(node, descend){
if (node !== self) {
if (node instanceof AST_Defun) {
if (!drop_funcs && scope === self) {
var node_def = node.name.definition();
if (!(node_def.id in in_use_ids)) {
in_use_ids[node_def.id] = true;
in_use.push(node_def);
}
}
initializations.add(node.name.name, node);
return true; // don't go in nested scopes
}
if (node instanceof AST_Definitions && scope === self) {
node.definitions.forEach(function(def){
if (!drop_vars) {
var node_def = def.name.definition();
if (!(node_def.id in in_use_ids)) {
in_use_ids[node_def.id] = true;
in_use.push(node_def);
}
}
if (def.value) {
initializations.add(def.name.name, def.value);
if (def.value.has_side_effects(compressor)) {
def.value.walk(tw);
}
}
});
return true;
}
if (assign_as_unused
&& node instanceof AST_Assign
&& node.operator == "="
&& node.left instanceof AST_SymbolRef
&& scope === self) {
node.right.walk(tw);
return true;
}
if (node instanceof AST_SymbolRef) {
var node_def = node.definition();
if (!(node_def.id in in_use_ids)) {
in_use_ids[node_def.id] = true;
in_use.push(node_def);
}
return true;
}
if (node instanceof AST_Scope) {
var save_scope = scope;
scope = node;
descend();
scope = save_scope;
return true;
}
}
});
self.walk(tw);
// pass 2: for every used symbol we need to walk its
// initialization code to figure out if it uses other
// symbols (that may not be in_use).
for (var i = 0; i < in_use.length; ++i) {
in_use[i].orig.forEach(function(decl){
// undeclared globals will be instanceof AST_SymbolRef
var init = initializations.get(decl.name);
if (init) init.forEach(functio ......
descend(node, this);
// Existing code relies on how AST_Node.optimize() worked, and omitting the
// following replacement call would result in degraded efficiency of both
// output and performance.
descend(node, this);
var opt = node.optimize(this);
if (was_scope && opt instanceof AST_Scope) {
opt.drop_unused(this);
descend(opt, this);
}
if (opt === node) opt._squeezed = true;
return opt;
}
});
...find_variable = function (name){
if (name instanceof AST_Symbol) name = name.name;
return this.variables.get(name)
|| (this.parent_scope && this.parent_scope.find_variable(name));
}...
while (scope = compressor.parent(i++)) {
if (scope instanceof AST_Scope) break;
if (scope instanceof AST_Catch) {
scope = scope.argname.definition().scope;
break;
}
}
return scope.find_variable(name);
}
function make_node(ctor, orig, props) {
if (!props) props = {};
if (orig) {
if (!props.start) props.start = orig.start;
if (!props.end) props.end = orig.end;
...hoist_declarations = function (compressor){
var self = this;
if (compressor.has_directive("use asm")) return self;
var hoist_funs = compressor.option("hoist_funs");
var hoist_vars = compressor.option("hoist_vars");
if (hoist_funs || hoist_vars) {
var dirs = [];
var hoisted = [];
var vars = new Dictionary(), vars_found = 0, var_decl = 0;
// let's count var_decl first, we seem to waste a lot of
// space if we hoist `var` when there's only one.
self.walk(new TreeWalker(function(node){
if (node instanceof AST_Scope && node !== self)
return true;
if (node instanceof AST_Var) {
++var_decl;
return true;
}
}));
hoist_vars = hoist_vars && var_decl > 1;
var tt = new TreeTransformer(
function before(node) {
if (node !== self) {
if (node instanceof AST_Directive) {
dirs.push(node);
return make_node(AST_EmptyStatement, node);
}
if (node instanceof AST_Defun && hoist_funs) {
hoisted.push(node);
return make_node(AST_EmptyStatement, node);
}
if (node instanceof AST_Var && hoist_vars) {
node.definitions.forEach(function(def){
vars.set(def.name.name, def);
++vars_found;
});
var seq = node.to_assignments(compressor);
var p = tt.parent();
if (p instanceof AST_ForIn && p.init === node) {
if (seq == null) {
var def = node.definitions[0].name;
return make_node(AST_SymbolRef, def, def);
}
return seq;
}
if (p instanceof AST_For && p.init === node) {
return seq;
}
if (!seq) return make_node(AST_EmptyStatement, node);
return make_node(AST_SimpleStatement, node, {
body: seq
});
}
if (node instanceof AST_Scope)
return node; // to avoid descending in nested scopes
}
}
);
self = self.transform(tt);
if (vars_found > 0) {
// collect only vars which don't show up in self's arguments list
var defs = [];
vars.each(function(def, name){
if (self instanceof AST_Lambda
&& find_if(function(x){ return x.name == def.name.name },
self.argnames)) {
vars.del(name);
} else {
def = def.clone();
def.value = null;
defs.push(def);
vars.set(name, def);
}
});
if (defs.length > 0) {
// try to merge in assignments
for (var i = 0; i < self.body.length;) {
if (self.body[i] instanceof AST_SimpleStatement) {
var expr = self.body[i].body, sym, assign;
if (expr instanceof AST_Assign
&& expr.operator == "="
&& (sym = expr.left) instanceof AST_Symbol
&& vars.has(sym.name))
{
var def = vars.get(sym.name);
if (def.value) break;
def.value = expr.right;
remove(defs, def);
defs.push(def);
self.body.splice(i, 1);
continue; ......
clear_warnings: function() {
this.warnings_produced = {};
},
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
...init_scope_vars = function (parent_scope){
this.variables = new Dictionary(); // map name to AST_SymbolVar (variables defined in this scope; includes functions)
this.functions = new Dictionary(); // map name to AST_SymbolDefun (functions defined in this scope)
this.uses_with = false; // will be set to true if this or some nested scope uses the `with` statement
this.uses_eval = false; // will be set to true if this or nested scope uses the global `eval`
this.parent_scope = parent_scope; // the parent scope
this.enclosed = []; // a list of variables from this or outer scope(s) that are referenced from this or inner
scopes
this.cname = -1; // the current index for mangling functions/variables
}...
var scope = self.parent_scope = null;
var labels = new Dictionary();
var defun = null;
var tw = new TreeWalker(function(node, descend){
if (node instanceof AST_Catch) {
var save_scope = scope;
scope = new AST_Scope(node);
scope.init_scope_vars(save_scope);
descend();
scope = save_scope;
return true;
}
if (node instanceof AST_Scope) {
node.init_scope_vars(scope);
var save_scope = scope;
...next_mangled = function (options){
var ext = this.enclosed;
out: while (true) {
var m = base54(++this.cname);
if (!is_identifier(m)) continue; // skip over "do"
// https://github.com/mishoo/UglifyJS2/issues/242 -- do not
// shadow a name excepted from mangling.
if (options.except.indexOf(m) >= 0) continue;
// we must ensure that the mangled name does not shadow a name
// from some parent scope that is referenced in this or in
// inner scopes.
for (var i = ext.length; --i >= 0;) {
var sym = ext[i];
var name = sym.mangled_name || (sym.unmangleable(options) && sym.name);
if (m == name) continue out;
}
return m;
}
}...
var sym = this.orig[0];
if (!options.screw_ie8 && sym instanceof AST_SymbolLambda)
s = s.parent_scope;
var def;
if (this.defun && (def = this.defun.variables.get(this.name))) {
this.mangled_name = def.mangled_name || def.name;
} else
this.mangled_name = s.next_mangled(options, this);
if (this.global && cache) {
cache.set(this.name, this.mangled_name);
}
}
}
};
...function AST_Seq(props){ if (props) { this.end = props.end;this.start = props.start;this.cdr = props.cdr;this.car = props.car;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...cons = function (x, y) {
var seq = new AST_Seq(x);
seq.car = x;
seq.cdr = y;
return seq;
}...
return seq;
},
$from_array: function(array) {
if (array.length == 0) return null;
if (array.length == 1) return array[0].clone();
var list = null;
for (var i = array.length; --i >= 0;) {
list = AST_Seq.cons(array[i], list);
}
var p = list;
while (p) {
if (p.cdr && !p.cdr.cdr) {
p.cdr = p.cdr.car;
break;
}
...from_array = function (array) {
if (array.length == 0) return null;
if (array.length == 1) return array[0].clone();
var list = null;
for (var i = array.length; --i >= 0;) {
list = AST_Seq.cons(array[i], list);
}
var p = list;
while (p) {
if (p.cdr && !p.cdr.cdr) {
p.cdr = p.cdr.car;
break;
}
p = p.cdr;
}
return list;
}...
return statements;
};
function sequencesize(statements, compressor) {
if (statements.length < 2) return statements;
var seq = [], ret = [];
function push_seq() {
seq = AST_Seq.from_array(seq);
if (seq) ret.push(make_node(AST_SimpleStatement, seq, {
body: seq
}));
seq = [];
};
statements.forEach(function(stat){
if (stat instanceof AST_SimpleStatement) {
...function AST_Seq(props){ if (props) { this.end = props.end;this.start = props.start;this.cdr = props.cdr;this.car = props.car;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self._do_print(output);
// var p = output.parent();
// if (p instanceof AST_Statement) {
// output.with_indent(output.next_indent(), function(){
// self._do_print(output);
// });
// } else {
// self._do_print(output);
// }
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._do_print = function (output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
output.newline();
output.indent();
}
this.cdr.print(output);
}
}...
arg.print(output);
});
});
output.space();
print_bracketed(self.body, output, true);
});
DEFPRINT(AST_Lambda, function(self, output){
self._do_print(output);
});
/* -----[ exits ]----- */
AST_Exit.DEFMETHOD("_do_print", function(output, kind){
output.print(kind);
if (this.value) {
output.space();
..._eq_null = function (pure_getters) {
return this.cdr._eq_null(pure_getters);
}...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.car._walk(visitor);
if (this.cdr) this.cdr._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...add = function (node) {
var p = this;
while (p) {
if (!(p.cdr instanceof AST_Seq)) {
var cell = AST_Seq.cons(p.cdr, node);
return p.cdr = cell;
}
p = p.cdr;
}
}...
};
function sequencesize_2(statements, compressor) {
function cons_seq(right) {
ret.pop();
var left = prev.body;
if (left instanceof AST_Seq) {
left.add(right);
} else {
left = AST_Seq.cons(left, right);
}
return left.transform(compressor);
};
var ret = [], prev = null;
statements.forEach(function(stat){
...drop_side_effect_free = function (compressor){
var cdr = this.cdr.drop_side_effect_free(compressor);
if (cdr === this.cdr) return this;
if (!cdr) return this.car;
return make_node(AST_Seq, this, {
car: this.car,
cdr: cdr
});
}...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...has_side_effects = function (compressor){
return this.car.has_side_effects(compressor)
|| this.cdr.has_side_effects(compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...is_boolean = function (){
return this.cdr.is_boolean();
}...
def(AST_Node, return_false);
def(AST_UnaryPrefix, function(){
return member(this.operator, unary_bool);
});
def(AST_Binary, function(){
return member(this.operator, binary_bool) ||
( (this.operator == "&&" || this.operator == "||") &&
this.left.is_boolean() && this.right.is_boolean() );
});
def(AST_Conditional, function(){
return this.consequent.is_boolean() && this.alternative.is_boolean();
});
def(AST_Assign, function(){
return this.operator == "=" && this.right.is_boolean();
});
...is_number = function (compressor){
return this.cdr.is_number(compressor);
}...
var unary = makePredicate("+ - ~ ++ --");
def(AST_Unary, function(){
return unary(this.operator);
});
var binary = makePredicate("- * / % & | ^ << >> >>>");
def(AST_Binary, function(compressor){
return binary(this.operator) || this.operator == "+"
&& this.left.is_number(compressor)
&& this.right.is_number(compressor);
});
def(AST_Assign, function(compressor){
return binary(this.operator.slice(0, -1))
|| this.operator == "=" && this.right.is_number(compressor);
});
def(AST_Seq, function(compressor){
...is_string = function (compressor){
return this.cdr.is_string(compressor);
}...
def(AST_Node, return_false);
def(AST_String, return_true);
def(AST_UnaryPrefix, function(){
return this.operator == "typeof";
});
def(AST_Binary, function(compressor){
return this.operator == "+" &&
(this.left.is_string(compressor) || this.right.is_string(compressor));
});
def(AST_Assign, function(compressor){
return (this.operator == "=" || this.operator == "+=") && this.right.is_string(compressor);
});
def(AST_Seq, function(compressor){
return this.cdr.is_string(compressor);
});
...len = function () {
if (this.cdr instanceof AST_Seq) {
return this.cdr.len() + 1;
} else {
return 2;
}
}...
return p.cdr = cell;
}
p = p.cdr;
}
},
len: function() {
if (this.cdr instanceof AST_Seq) {
return this.cdr.len() + 1;
} else {
return 2;
}
},
_walk: function(visitor) {
return visitor._visit(this, function(){
this.car._walk(visitor);
...needs_parens = function (output){
var p = output.parent();
return p instanceof AST_Call // (foo, bar)() or foo(1, (2, 3), 4)
|| p instanceof AST_Unary // !(foo, bar, baz)
|| p instanceof AST_Binary // 1 + (2, 3) + 4 ==> 8
|| p instanceof AST_VarDef // var a = (1, 2), b = a + a; ==> b == 4
|| p instanceof AST_PropAccess // (1, {foo:2}).foo or (1, {foo:2})["foo"] ==> 2
|| p instanceof AST_Array // [ 1, (2, 3), 4 ] ==> [ 1, 3, 4 ]
|| p instanceof AST_ObjectProperty // { foo: (1, 2) }.foo ==> 2
|| p instanceof AST_Conditional /* (false, true) ? (a = 10, b = 20) : (c = 30)
* ==> 20 (side effect, set a := 10 and b := 20) */
;
}...
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
if (self instanceof AST_Scope) {
use_asm = prev_use_asm;
...negate = function (compressor, first_in_statement){
return func.call(this, compressor, first_in_statement);
}...
continue loop;
}
//---
// if (foo()) return; [ else x... ]; y... ==> if (!foo()) { x...; y... }
if (!stat.body.value && in_lambda) {
CHANGED = true;
stat = stat.clone();
stat.condition = stat.condition.negate(compressor);
var body = as_statement_array(stat.alternative).concat(ret);
var funs = extract_functions_from_statement_array(body);
stat.body = make_node(AST_BlockStatement, stat, {
body: body
});
stat.alternative = null;
ret = funs.concat([ stat.transform(compressor) ]);
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_array = function () {
var p = this, a = [];
while (p) {
a.push(p.car);
if (p.cdr && !(p.cdr instanceof AST_Seq)) {
a.push(p.cdr);
break;
}
p = p.cdr;
}
return a;
}...
return self;
});
AST_Unary.DEFMETHOD("lift_sequences", function(compressor){
if (compressor.option("sequences")) {
if (this.expression instanceof AST_Seq) {
var seq = this.expression;
var x = seq.to_array();
var e = this.clone();
e.expression = x.pop();
x.push(e);
seq = AST_Seq.from_array(x).transform(compressor);
return seq;
}
}
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_SimpleStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Statement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_SimpleStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self.body.print(output);
output.semicolon();
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.body._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...has_side_effects = function (compressor){
return this.body.has_side_effects(compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Statement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Debugger(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Directive(props){ if (props) { this.end = props.end;this.start = props.start;this.quote = props.quote;this.scope =
props.scope;this.value = props.value;}}n/a
function AST_SimpleStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Block(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_EmptyStatement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_StatementWithBody(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Jump(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Definitions(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions
;}}n/a
function AST_Statement(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self.body.print(output);
output.semicolon();
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._eval = function (){
throw new Error(string_template("Cannot evaluate a statement [{file}:{line},{col}]", this.start));
}...
// then its value is returned; otherwise the element itself
// is returned.
// They can be distinguished as constant value is never a
// descendant of AST_Node.
AST_Node.DEFMETHOD("evaluate", function(compressor){
if (!compressor.option("evaluate")) return this;
try {
var val = this._eval(compressor);
return !val || val instanceof RegExp || typeof val != "object" ? val : this;
} catch(ex) {
if (ex !== def) throw ex;
return this;
}
});
var unaryPrefix = makePredicate("! ~ - + void");
...function return_null() { return null; }...
});
})(function(node, func){
node.DEFMETHOD("has_side_effects", func);
});
// tell me if a statement aborts
function aborts(thing) {
return thing && thing.aborts();
};
(function(def){
def(AST_Statement, return_null);
def(AST_Jump, return_this);
function block_aborts(){
var n = this.body.length;
return n > 0 && aborts(this.body[n - 1]);
...negate = function (compressor, first_in_statement){
return func.call(this, compressor, first_in_statement);
}...
continue loop;
}
//---
// if (foo()) return; [ else x... ]; y... ==> if (!foo()) { x...; y... }
if (!stat.body.value && in_lambda) {
CHANGED = true;
stat = stat.clone();
stat.condition = stat.condition.negate(compressor);
var body = as_statement_array(stat.alternative).concat(ret);
var funs = extract_functions_from_statement_array(body);
stat.body = make_node(AST_BlockStatement, stat, {
body: body
});
stat.alternative = null;
ret = funs.concat([ stat.transform(compressor) ]);
...function AST_StatementWithBody(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Statement(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_LabeledStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.label
= props.label;}}n/a
function AST_IterationStatement(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_With(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.expression = props
.expression;}}n/a
function AST_If(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.alternative = props
.alternative;this.condition = props.condition;}}n/a
function AST_StatementWithBody(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._do_print_body = function (output){
force_statement(this.body, output);
}...
DEFPRINT(AST_While, function(self, output){
output.print("while");
output.space();
output.with_parens(function(){
self.condition.print(output);
});
output.space();
self._do_print_body(output);
});
DEFPRINT(AST_For, function(self, output){
output.print("for");
output.space();
output.with_parens(function(){
if (self.init) {
if (self.init instanceof AST_Definitions) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.body._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...function AST_String(props){ if (props) { this.end = props.end;this.start = props.start;this.quote = props.quote;this.value = props
.value;}}n/a
function AST_Constant(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_String(props){ if (props) { this.end = props.end;this.start = props.start;this.quote = props.quote;this.value = props
.value;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print_string(self.getValue(), self.quote, in_directive);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...function return_true() { return true; }...
def(AST_Node, return_false);
def(AST_String, return_true);
def(AST_UnaryPrefix, function(){
return this.operator == "typeof";
});
def(AST_Binary, function(compressor){
return this.operator == "+" &&
(this.left.is_string(compressor) || this.right.is_string(compressor));
});
def(AST_Assign, function(compressor){
return (this.operator == "=" || this.operator == "+=") && this.right.is_string(compressor);
});
def(AST_Seq, function(compressor){
return this.cdr.is_string(compressor);
});
...function AST_Sub(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}n/a
function AST_PropAccess(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Sub(props){ if (props) { this.end = props.end;this.start = props.start;this.property = props.property;this.expression
= props.expression;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self.expression.print(output);
output.print("[");
self.property.print(output);
output.print("]");
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.expression._walk(visitor);
this.property._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...drop_side_effect_free = function (compressor, first_in_statement){
if (this.expression.may_eq_null(compressor)) return this;
var expression = this.expression.drop_side_effect_free(compressor, first_in_statement);
if (!expression) return this.property.drop_side_effect_free(compressor, first_in_statement);
var property = this.property.drop_side_effect_free(compressor);
if (!property) return expression;
return make_node(AST_Seq, this, {
car: expression,
cdr: property
});
}...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...has_side_effects = function (compressor){
return this.expression.may_eq_null(compressor)
|| this.expression.has_side_effects(compressor)
|| this.property.has_side_effects(compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Switch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.expression =
props.expression;}}n/a
function AST_Block(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Switch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.expression =
props.expression;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("switch");
output.space();
output.with_parens(function(){
self.expression.print(output);
});
output.space();
var last = self.body.length - 1;
if (last < 0) output.print("{}");
else output.with_block(function(){
self.body.forEach(function(branch, i){
output.indent(true);
branch.print(output);
if (i < last && branch.body.length > 0)
output.newline();
});
});
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.expression._walk(visitor);
walk_body(this, visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...has_side_effects = function (compressor){
return this.expression.has_side_effects(compressor)
|| any(this.body, compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_SwitchBranch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Block(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Default(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
function AST_Case(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.expression = props
.expression;}}n/a
function AST_SwitchBranch(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._do_print_body = function (output){
output.newline();
this.body.forEach(function(stmt){
output.indent();
stmt.print(output);
output.newline();
});
}...
DEFPRINT(AST_While, function(self, output){
output.print("while");
output.space();
output.with_parens(function(){
self.condition.print(output);
});
output.space();
self._do_print_body(output);
});
DEFPRINT(AST_For, function(self, output){
output.print("for");
output.space();
output.with_parens(function(){
if (self.init) {
if (self.init instanceof AST_Definitions) {
...function block_aborts(){
var n = this.body.length;
return n > 0 && aborts(this.body[n - 1]);
}...
});
})(function(node, func){
node.DEFMETHOD("has_side_effects", func);
});
// tell me if a statement aborts
function aborts(thing) {
return thing && thing.aborts();
};
(function(def){
def(AST_Statement, return_null);
def(AST_Jump, return_this);
function block_aborts(){
var n = this.body.length;
return n > 0 && aborts(this.body[n - 1]);
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Symbol(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_SymbolAccessor(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;}}n/a
function AST_SymbolDeclaration(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this
.name = props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_Label(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;this.references = props.references;this.initialize();}}n/a
function AST_SymbolRef(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name =
props.name;this.scope = props.scope;}}n/a
function AST_LabelRef(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name =
props.name;this.scope = props.scope;}}n/a
function AST_This(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}n/a
function AST_Symbol(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
var def = self.definition();
output.print_name(def ? def.mangled_name || def.name : self.name);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...definition = function (){
return this.thedef;
}...
},
wrap_commonjs: function(name, export_all) {
var self = this;
var to_export = [];
if (export_all) {
self.figure_out_scope();
self.walk(new TreeWalker(function(node){
if (node instanceof AST_SymbolDeclaration && node.definition().
global) {
if (!find_if(function(n){ return n.name == node.name }, to_export))
to_export.push(node);
}
}));
}
var wrapped_tl = "(function(exports, global){ '$ORIG'; '$EXPORTS'; global['" + name + "
;'] = exports; }({}, (function(){return this}())))";
wrapped_tl = parse(wrapped_tl);
...global = function (){
return this.definition().global;
}...
return make_node_from_constant(value, orig);
}
def(AST_Node, noop);
def(AST_Dot, function(compressor, suffix){
return this.expression._find_defs(compressor, "." + this.property + suffix);
});
def(AST_SymbolRef, function(compressor, suffix){
if (!this.global()) return;
var name;
var defines = compressor.option("global_defs");
if (defines && HOP(defines, (name = this.name + suffix))) {
var node = to_node(defines[name], this);
var top = compressor.find_parent(AST_Toplevel);
node.walk(new TreeWalker(function(node) {
if (node instanceof AST_SymbolRef) {
...mark_enclosed = function (options) {
var def = this.definition();
var s = this.scope;
while (s) {
push_uniq(s.enclosed, def);
if (options.keep_fnames) {
s.functions.each(function(d) {
push_uniq(def.scope.enclosed, d);
});
}
if (s === def.scope) break;
s = s.parent_scope;
}
}...
// later.
(node.scope = defun.parent_scope).def_function(node);
}
else if (node instanceof AST_SymbolVar
|| node instanceof AST_SymbolConst) {
defun.def_variable(node);
if (defun !== scope) {
node.mark_enclosed(options);
var def = scope.find_variable(node);
if (node.thedef !== def) {
node.thedef = def;
node.reference(options);
}
}
}
...reference = function (options) {
this.definition().references.push(this);
this.mark_enclosed(options);
}...
|| node instanceof AST_SymbolConst) {
defun.def_variable(node);
if (defun !== scope) {
node.mark_enclosed(options);
var def = scope.find_variable(node);
if (node.thedef !== def) {
node.thedef = def;
node.reference(options);
}
}
}
else if (node instanceof AST_SymbolCatch) {
scope.def_variable(node).defun = defun;
}
else if (node instanceof AST_LabelRef) {
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...undeclared = function (){
return this.definition().undeclared;
}...
|| this.alternative.has_side_effects(compressor);
});
def(AST_Unary, function(compressor){
return unary_side_effects(this.operator)
|| this.expression.has_side_effects(compressor);
});
def(AST_SymbolRef, function(compressor){
return this.undeclared();
});
def(AST_Object, function(compressor){
return any(this.properties, compressor);
});
def(AST_ObjectProperty, function(compressor){
return this.value.has_side_effects(compressor);
});
...unmangleable = function (options){
return this.definition().unmangleable(options);
}...
|| this.orig[0] instanceof AST_SymbolDefun));
},
mangle: function(options) {
var cache = options.cache && options.cache.props;
if (this.global && cache && cache.has(this.name)) {
this.mangled_name = cache.get(this.name);
}
else if (!this.mangled_name && !this.unmangleable(options)) {
var s = this.scope;
var sym = this.orig[0];
if (!options.screw_ie8 && sym instanceof AST_SymbolLambda)
s = s.parent_scope;
var def;
if (this.defun && (def = this.defun.variables.get(this.name))) {
this.mangled_name = def.mangled_name || def.name;
...unreferenced = function (){
return this.definition().references.length == 0
&& !(this.scope.uses_eval || this.scope.uses_with);
}...
var trim = !compressor.option("keep_fargs");
for (var a = node.argnames, i = a.length; --i >= 0;) {
var sym = a[i];
if (!(sym.definition().id in in_use_ids)) {
sym.__unused = true;
if (trim) {
a.pop();
compressor[sym.unreferenced() ? "warn" : "info"]("
;Dropping unused function argument {name} [{file}:{line},{col}]", {
name : sym.name,
file : sym.start.file,
line : sym.start.line,
col : sym.start.col
});
}
}
...function AST_SymbolAccessor(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;}}n/a
function AST_Symbol(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_SymbolAccessor(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...unmangleable = function (){
return true;
}...
|| this.orig[0] instanceof AST_SymbolDefun));
},
mangle: function(options) {
var cache = options.cache && options.cache.props;
if (this.global && cache && cache.has(this.name)) {
this.mangled_name = cache.get(this.name);
}
else if (!this.mangled_name && !this.unmangleable(options)) {
var s = this.scope;
var sym = this.orig[0];
if (!options.screw_ie8 && sym instanceof AST_SymbolLambda)
s = s.parent_scope;
var def;
if (this.defun && (def = this.defun.variables.get(this.name))) {
this.mangled_name = def.mangled_name || def.name;
...function AST_SymbolCatch(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolDeclaration(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this
.name = props.name;this.scope = props.scope;this.init = props.init;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_SymbolCatch(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function AST_SymbolConst(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolDeclaration(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this
.name = props.name;this.scope = props.scope;this.init = props.init;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_SymbolConst(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function AST_SymbolDeclaration(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this
.name = props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_Symbol(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_SymbolVar(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name =
props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolConst(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolDefun(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolLambda(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolCatch(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolDeclaration(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this
.name = props.name;this.scope = props.scope;this.init = props.init;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function AST_SymbolDefun(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolDeclaration(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this
.name = props.name;this.scope = props.scope;this.init = props.init;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_SymbolDefun(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function AST_SymbolFunarg(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolVar(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name =
props.name;this.scope = props.scope;this.init = props.init;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_SymbolFunarg(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function AST_SymbolLambda(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolDeclaration(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this
.name = props.name;this.scope = props.scope;this.init = props.init;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_SymbolLambda(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function AST_SymbolRef(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name =
props.name;this.scope = props.scope;}}n/a
function AST_Symbol(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_SymbolRef(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name =
props.name;this.scope = props.scope;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._eq_null = function (pure_getters) {
if (this.is_undefined) return true;
if (!is_strict(pure_getters)) return false;
var fixed = this.fixed_value();
return !fixed || fixed._eq_null(pure_getters);
}...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
..._eval = function (compressor){
if (this._evaluating) throw def;
this._evaluating = true;
try {
var fixed = this.fixed_value();
if (compressor.option("reduce_vars") && fixed) {
if (compressor.option("unsafe")) {
if (!HOP(fixed, "_evaluated")) {
fixed._evaluated = ev(fixed, compressor);
}
return fixed._evaluated;
}
return ev(fixed, compressor);
}
} finally {
this._evaluating = false;
}
throw def;
}...
// then its value is returned; otherwise the element itself
// is returned.
// They can be distinguished as constant value is never a
// descendant of AST_Node.
AST_Node.DEFMETHOD("evaluate", function(compressor){
if (!compressor.option("evaluate")) return this;
try {
var val = this._eval(compressor);
return !val || val instanceof RegExp || typeof val != "object" ? val : this;
} catch(ex) {
if (ex !== def) throw ex;
return this;
}
});
var unaryPrefix = makePredicate("! ~ - + void");
..._find_defs = function (compressor, suffix){
if (!this.global()) return;
var name;
var defines = compressor.option("global_defs");
if (defines && HOP(defines, (name = this.name + suffix))) {
var node = to_node(defines[name], this);
var top = compressor.find_parent(AST_Toplevel);
node.walk(new TreeWalker(function(node) {
if (node instanceof AST_SymbolRef) {
node.scope = top;
node.thedef = top.def_global(node);
}
}));
return node;
}
}...
if (parent instanceof AST_Unary && unary_side_effects(parent.operator)) return parent.expression;
if (parent instanceof AST_Assign && parent.left === node) return node;
}
(function (def){
AST_Node.DEFMETHOD("resolve_defines", function(compressor) {
if (!compressor.option("global_defs")) return;
var def = this._find_defs(compressor, "");
if (def) {
var node, parent = this, level = 0;
do {
node = parent;
parent = compressor.parent(level++);
} while (parent instanceof AST_PropAccess && parent.expression === node);
if (is_lhs(node, parent)) {
...drop_side_effect_free = function () {
return this.undeclared() ? this : null;
}...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...fixed_value = function () {
var fixed = this.definition().fixed;
if (!fixed || fixed instanceof AST_Node) return fixed;
return fixed();
}...
if (reduce_vars) {
if (node instanceof AST_Toplevel) node.globals.each(reset_def);
if (node instanceof AST_Scope) node.variables.each(reset_def);
if (node instanceof AST_SymbolRef) {
var d = node.definition();
d.references.push(node);
if (d.fixed === undefined || !is_safe(d)
|| is_modified(node, 0, node.fixed_value() instanceof AST_Lambda)) {
d.fixed = false;
}
}
if (node instanceof AST_SymbolCatch) {
node.definition().fixed = false;
}
if (node instanceof AST_VarDef) {
...has_side_effects = function (compressor){
return this.undeclared();
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...function AST_SymbolVar(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name =
props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolDeclaration(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this
.name = props.name;this.scope = props.scope;this.init = props.init;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_SymbolFunarg(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name
= props.name;this.scope = props.scope;this.init = props.init;}}n/a
function AST_SymbolVar(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name =
props.name;this.scope = props.scope;this.init = props.init;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function AST_This(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}n/a
function AST_Symbol(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_This(props){ if (props) { this.end = props.end;this.start = props.start;this.thedef = props.thedef;this.name = props
.name;this.scope = props.scope;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("this");
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...function return_null() { return null; }...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...function return_false() { return false; }...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Throw(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
function AST_Exit(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Throw(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self._do_print(output, "throw");
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_Token(props){ if (props) { this.raw = props.raw;this.file = props.file;this.comments_before = props.comments_before
;this.nlb = props.nlb;this.endpos = props.endpos;this.endcol = props.endcol;this.endline = props.endline;this.pos = props.pos;this
.col = props.col;this.line = props.line;this.value = props.value;this.type = props.type;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Token(props){ if (props) { this.raw = props.raw;this.file = props.file;this.comments_before = props.comments_before
;this.nlb = props.nlb;this.endpos = props.endpos;this.endcol = props.endcol;this.endline = props.endline;this.pos = props.pos;this
.col = props.col;this.line = props.line;this.value = props.value;this.type = props.type;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function AST_Toplevel(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.globals = props
.globals;}}n/a
function AST_Scope(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props.
cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Toplevel(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.cname = props
.cname;this.enclosed = props.enclosed;this.parent_scope = props.parent_scope;this.uses_eval = props.uses_eval;this.uses_with = props
.uses_with;this.functions = props.functions;this.variables = props.variables;this.directives = props.directives;this.globals = props
.globals;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
display_body(self.body, true, output, true);
output.print("");
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._default_mangler_options = function (options){
return defaults(options, {
eval : false,
except : [],
keep_fnames : false,
screw_ie8 : true,
sort : false, // Ignored. Flag retained for backwards compatibility.
toplevel : false,
});
}...
screw_ie8 : true,
sort : false, // Ignored. Flag retained for backwards compatibility.
toplevel : false,
});
});
AST_Toplevel.DEFMETHOD("mangle_names", function(options){
options = this._default_mangler_options(options);
// Never mangle arguments
options.except.push('arguments');
// We only need to mangle declaration nodes. Special logic wired
// into the code generator will display the mangled name if it's
// present (and for AST_SymbolRef-s it'll use the mangled name of
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...compute_char_frequency = function (options){
options = this._default_mangler_options(options);
var tw = new TreeWalker(function(node){
if (node instanceof AST_Constant)
base54.consider(node.print_to_string());
else if (node instanceof AST_Return)
base54.consider("return");
else if (node instanceof AST_Throw)
base54.consider("throw");
else if (node instanceof AST_Continue)
base54.consider("continue");
else if (node instanceof AST_Break)
base54.consider("break");
else if (node instanceof AST_Debugger)
base54.consider("debugger");
else if (node instanceof AST_Directive)
base54.consider(node.value);
else if (node instanceof AST_While)
base54.consider("while");
else if (node instanceof AST_Do)
base54.consider("do while");
else if (node instanceof AST_If) {
base54.consider("if");
if (node.alternative) base54.consider("else");
}
else if (node instanceof AST_Var)
base54.consider("var");
else if (node instanceof AST_Const)
base54.consider("const");
else if (node instanceof AST_Lambda)
base54.consider("function");
else if (node instanceof AST_For)
base54.consider("for");
else if (node instanceof AST_ForIn)
base54.consider("for in");
else if (node instanceof AST_Switch)
base54.consider("switch");
else if (node instanceof AST_Case)
base54.consider("case");
else if (node instanceof AST_Default)
base54.consider("default");
else if (node instanceof AST_With)
base54.consider("with");
else if (node instanceof AST_ObjectSetter)
base54.consider("set" + node.key);
else if (node instanceof AST_ObjectGetter)
base54.consider("get" + node.key);
else if (node instanceof AST_ObjectKeyVal)
base54.consider(node.key);
else if (node instanceof AST_New)
base54.consider("new");
else if (node instanceof AST_This)
base54.consider("this");
else if (node instanceof AST_Try)
base54.consider("try");
else if (node instanceof AST_Catch)
base54.consider("catch");
else if (node instanceof AST_Finally)
base54.consider("finally");
else if (node instanceof AST_Symbol && node.unmangleable(options))
base54.consider(node.name);
else if (node instanceof AST_Unary || node instanceof AST_Binary)
base54.consider(node.operator);
else if (node instanceof AST_Dot)
base54.consider(node.property);
});
this.walk(tw);
base54.sort();
}...
// Compression
uAST.figure_out_scope();
uAST = UglifyJS.Compressor(options).compress(uAST);
// Mangling (optional)
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
...def_global = function (node){
var globals = this.globals, name = node.name;
if (globals.has(name)) {
return globals.get(name);
} else {
var g = new SymbolDef(this, globals.size(), node);
g.undeclared = true;
g.global = true;
globals.set(name, g);
return g;
}
}...
var defines = compressor.option("global_defs");
if (defines && HOP(defines, (name = this.name + suffix))) {
var node = to_node(defines[name], this);
var top = compressor.find_parent(AST_Toplevel);
node.walk(new TreeWalker(function(node) {
if (node instanceof AST_SymbolRef) {
node.scope = top;
node.thedef = top.def_global(node);
}
}));
return node;
}
});
})(function(node, func){
node.DEFMETHOD("_find_defs", func);
...figure_out_scope = function (options){
options = defaults(options, {
cache: null,
screw_ie8: true,
});
// pass 1: setup scope chaining and handle definitions
var self = this;
var scope = self.parent_scope = null;
var labels = new Dictionary();
var defun = null;
var tw = new TreeWalker(function(node, descend){
if (node instanceof AST_Catch) {
var save_scope = scope;
scope = new AST_Scope(node);
scope.init_scope_vars(save_scope);
descend();
scope = save_scope;
return true;
}
if (node instanceof AST_Scope) {
node.init_scope_vars(scope);
var save_scope = scope;
var save_defun = defun;
var save_labels = labels;
defun = scope = node;
labels = new Dictionary();
descend();
scope = save_scope;
defun = save_defun;
labels = save_labels;
return true; // don't descend again in TreeWalker
}
if (node instanceof AST_LabeledStatement) {
var l = node.label;
if (labels.has(l.name)) {
throw new Error(string_template("Label {name} defined twice", l));
}
labels.set(l.name, l);
descend();
labels.del(l.name);
return true; // no descend again
}
if (node instanceof AST_With) {
for (var s = scope; s; s = s.parent_scope)
s.uses_with = true;
return;
}
if (node instanceof AST_Symbol) {
node.scope = scope;
}
if (node instanceof AST_Label) {
node.thedef = node;
node.references = [];
}
if (node instanceof AST_SymbolLambda) {
defun.def_function(node);
}
else if (node instanceof AST_SymbolDefun) {
// Careful here, the scope where this should be defined is
// the parent scope. The reason is that we enter a new
// scope when we encounter the AST_Defun node (which is
// instanceof AST_Scope) but we get to the symbol a bit
// later.
(node.scope = defun.parent_scope).def_function(node);
}
else if (node instanceof AST_SymbolVar
|| node instanceof AST_SymbolConst) {
defun.def_variable(node);
if (defun !== scope) {
node.mark_enclosed(options);
var def = scope.find_variable(node);
if (node.thedef !== def) {
node.thedef = def;
node.reference(options);
}
}
}
else if (node instanceof AST_SymbolCatch) {
scope.def_variable(node).defun = defun;
}
else if (node instanceof AST_LabelRef) {
var sym = labels.get(node.name);
if (!sym) throw new Error(string_template("Undefined label {name} [{line},{col}]", {
name: node.name,
line: node.start.line,
col: node.start.col
}));
node.thedef = sym;
}
});
self.walk(tw);
// pass 2: find back references and eval
var func = null;
var globals = self.globals = new Dictionary();
var tw = new TreeWalker(function(node, descend){
if (node instanceof AST_Lambda) {
var prev_func = func;
func = node;
descend();
func = prev_func;
return true;
}
if (node instanceof AST_LoopControl && node.label) {
node.label.thedef.references.push(node);
return true;
}
if (node instanceof AST_SymbolRef) {
var name = node.name;
if (name == "eval" && tw.parent() instanceof AST_Call) {
for (var s = node.scope; s && !s.uses_eval; s = s.parent_scope) {
s.uses_eval = true;
}
}
var sym = node.scope.fi ......
```javascript
function uglify(ast, options, mangle) {
// Conversion from SpiderMonkey AST to internal format
var uAST = UglifyJS.AST_Node.from_mozilla_ast(ast);
// Compression
uAST.figure_out_scope();
uAST = UglifyJS.Compressor(options).compress(uAST);
// Mangling (optional)
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
...mangle_names = function (options){
options = this._default_mangler_options(options);
// Never mangle arguments
options.except.push('arguments');
// We only need to mangle declaration nodes. Special logic wired
// into the code generator will display the mangled name if it's
// present (and for AST_SymbolRef-s it'll use the mangled name of
// the AST_SymbolDeclaration that it points to).
var lname = -1;
var to_mangle = [];
if (options.cache) {
this.globals.each(function(symbol){
if (options.except.indexOf(symbol.name) < 0) {
to_mangle.push(symbol);
}
});
}
var tw = new TreeWalker(function(node, descend){
if (node instanceof AST_LabeledStatement) {
// lname is incremented when we get to the AST_Label
var save_nesting = lname;
descend();
lname = save_nesting;
return true; // don't descend again in TreeWalker
}
if (node instanceof AST_Scope) {
var p = tw.parent(), a = [];
node.variables.each(function(symbol){
if (options.except.indexOf(symbol.name) < 0) {
a.push(symbol);
}
});
to_mangle.push.apply(to_mangle, a);
return;
}
if (node instanceof AST_Label) {
var name;
do name = base54(++lname); while (!is_identifier(name));
node.mangled_name = name;
return true;
}
if (options.screw_ie8 && node instanceof AST_SymbolCatch) {
to_mangle.push(node.definition());
return;
}
});
this.walk(tw);
to_mangle.forEach(function(def){ def.mangle(options) });
if (options.cache) {
options.cache.cname = this.cname;
}
}...
uAST.figure_out_scope();
uAST = UglifyJS.Compressor(options).compress(uAST);
// Mangling (optional)
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
...scope_warnings = function (options){
options = defaults(options, {
assign_to_global : true,
eval : true,
func_arguments : true,
nested_defuns : true,
undeclared : false, // this makes a lot of noise
unreferenced : true,
});
var tw = new TreeWalker(function(node){
if (options.undeclared
&& node instanceof AST_SymbolRef
&& node.undeclared())
{
// XXX: this also warns about JS standard names,
// i.e. Object, Array, parseInt etc. Should add a list of
// exceptions.
AST_Node.warn("Undeclared symbol: {name} [{file}:{line},{col}]", {
name: node.name,
file: node.start.file,
line: node.start.line,
col: node.start.col
});
}
if (options.assign_to_global)
{
var sym = null;
if (node instanceof AST_Assign && node.left instanceof AST_SymbolRef)
sym = node.left;
else if (node instanceof AST_ForIn && node.init instanceof AST_SymbolRef)
sym = node.init;
if (sym
&& (sym.undeclared()
|| (sym.global() && sym.scope !== sym.definition().scope))) {
AST_Node.warn("{msg}: {name} [{file}:{line},{col}]", {
msg: sym.undeclared() ? "Accidental global?" : "Assignment to global",
name: sym.name,
file: sym.start.file,
line: sym.start.line,
col: sym.start.col
});
}
}
if (options.eval
&& node instanceof AST_SymbolRef
&& node.undeclared()
&& node.name == "eval") {
AST_Node.warn("Eval is used [{file}:{line},{col}]", node.start);
}
if (options.unreferenced
&& (node instanceof AST_SymbolDeclaration || node instanceof AST_Label)
&& !(node instanceof AST_SymbolCatch)
&& node.unreferenced()) {
AST_Node.warn("{type} {name} is declared but not referenced [{file}:{line},{col}]", {
type: node instanceof AST_Label ? "Label" : "Symbol",
name: node.name,
file: node.start.file,
line: node.start.line,
col: node.start.col
});
}
if (options.func_arguments
&& node instanceof AST_Lambda
&& node.uses_arguments) {
AST_Node.warn("arguments used in function {name} [{file}:{line},{col}]", {
name: node.name ? node.name.name : "anonymous",
file: node.start.file,
line: node.start.line,
col: node.start.col
});
}
if (options.nested_defuns
&& node instanceof AST_Defun
&& !(tw.parent() instanceof AST_Scope)) {
AST_Node.warn("Function {name} declared in nested statement \"{type}\" [{file}:{line},{col}]", {
name: node.name.name,
type: tw.parent().TYPE,
file: node.start.file,
line: node.start.line,
col: node.start.col
});
}
});
this.walk(tw);
}n/a
to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...wrap_commonjs = function (name, export_all) {
var self = this;
var to_export = [];
if (export_all) {
self.figure_out_scope();
self.walk(new TreeWalker(function(node){
if (node instanceof AST_SymbolDeclaration && node.definition().global) {
if (!find_if(function(n){ return n.name == node.name }, to_export))
to_export.push(node);
}
}));
}
var wrapped_tl = "(function(exports, global){ '$ORIG'; '$EXPORTS'; global['" + name + "'] = exports; }({}, (function(){return
this}())))";
wrapped_tl = parse(wrapped_tl);
wrapped_tl = wrapped_tl.transform(new TreeTransformer(function before(node){
if (node instanceof AST_Directive) {
switch (node.value) {
case "$ORIG":
return MAP.splice(self.body);
case "$EXPORTS":
var body = [];
to_export.forEach(function(sym){
body.push(new AST_SimpleStatement({
body: new AST_Assign({
left: new AST_Sub({
expression: new AST_SymbolRef({ name: "exports" }),
property: new AST_String({ value: sym.name }),
}),
operator: "=",
right: new AST_SymbolRef(sym),
}),
}));
});
return MAP.splice(body);
}
}
}));
return wrapped_tl;
}n/a
wrap_enclose = function (arg_parameter_pairs) {
var self = this;
var args = [];
var parameters = [];
arg_parameter_pairs.forEach(function(pair) {
var splitAt = pair.lastIndexOf(":");
args.push(pair.substr(0, splitAt));
parameters.push(pair.substr(splitAt + 1));
});
var wrapped_tl = "(function(" + parameters.join(",") + "){ '$ORIG'; })(" + args.join(",") + ")";
wrapped_tl = parse(wrapped_tl);
wrapped_tl = wrapped_tl.transform(new TreeTransformer(function before(node){
if (node instanceof AST_Directive && node.value == "$ORIG") {
return MAP.splice(self.body);
}
}));
return wrapped_tl;
}n/a
function AST_True(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Boolean(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_True(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function return_true() { return true; }...
def(AST_Node, return_false);
def(AST_UnaryPrefix, function(){
return member(this.operator, unary_bool);
});
def(AST_Binary, function(){
return member(this.operator, binary_bool) ||
( (this.operator == "&&" || this.operator == "||") &&
this.left.is_boolean() && this.right.is_boolean() );
});
def(AST_Conditional, function(){
return this.consequent.is_boolean() && this.alternative.is_boolean();
});
def(AST_Assign, function(){
return this.operator == "=" && this.right.is_boolean();
});
...function AST_Try(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.bfinally = props
.bfinally;this.bcatch = props.bcatch;}}n/a
function AST_Block(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Try(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.bfinally = props
.bfinally;this.bcatch = props.bcatch;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("try");
output.space();
print_bracketed(self.body, output);
if (self.bcatch) {
output.space();
self.bcatch.print(output);
}
if (self.bfinally) {
output.space();
self.bfinally.print(output);
}
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
walk_body(this, visitor);
if (this.bcatch) this.bcatch._walk(visitor);
if (this.bfinally) this.bfinally._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...add_source_map = function (stream){
generator(this, stream);
}...
AST_Node.DEFMETHOD("print", function(stream, force_parens){
var self = this, generator = self._codegen, prev_use_asm = use_asm;
if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope
) {
use_asm = true;
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
...has_side_effects = function (compressor){
return any(this.body, compressor)
|| this.bcatch && this.bcatch.has_side_effects(compressor)
|| this.bfinally && this.bfinally.has_side_effects(compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_Unary(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;this.operator
= props.operator;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_UnaryPrefix(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;this
.operator = props.operator;}}n/a
function AST_UnaryPostfix(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;
this.operator = props.operator;}}n/a
function AST_Unary(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;this.operator
= props.operator;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.expression._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...drop_side_effect_free = function (compressor, first_in_statement){
if (unary_side_effects(this.operator)) return this;
if (this.operator == "typeof" && this.expression instanceof AST_SymbolRef) return null;
var expression = this.expression.drop_side_effect_free(compressor, first_in_statement);
if (first_in_statement
&& this instanceof AST_UnaryPrefix
&& is_iife_call(expression)) {
if (expression === this.expression && this.operator.length === 1) return this;
return make_node(AST_UnaryPrefix, this, {
operator: this.operator.length === 1 ? this.operator : "!",
expression: expression
});
}
return expression;
}...
if (insert && node instanceof AST_SimpleStatement) {
return make_node(AST_Return, node, {
value: node.body
});
}
if (!insert && node instanceof AST_Return) {
if (compressor) {
var value = node.value && node.value.drop_side_effect_free(compressor
, true);
return value ? make_node(AST_SimpleStatement, node, {
body: value
}) : make_node(AST_EmptyStatement, node);
}
return make_node(AST_SimpleStatement, node, {
body: node.value || make_node(AST_UnaryPrefix, node, {
operator: "void",
...has_side_effects = function (compressor){
return unary_side_effects(this.operator)
|| this.expression.has_side_effects(compressor);
}...
stat.transform(ctt);
continue;
}
// Restrict var replacement to constants if side effects encountered.
if (side_effects_encountered |= lvalues_encountered) continue;
var value_has_side_effects = var_decl.value.has_side_effects(compressor);
// Non-constant single use vars can only be replaced in same scope.
if (ref.scope !== self) {
side_effects_encountered |= value_has_side_effects;
continue;
}
// Detect lvalues in var value.
...is_number = function (){
return unary(this.operator);
}...
var unary = makePredicate("+ - ~ ++ --");
def(AST_Unary, function(){
return unary(this.operator);
});
var binary = makePredicate("- * / % & | ^ << >> >>>");
def(AST_Binary, function(compressor){
return binary(this.operator) || this.operator == "+"
&& this.left.is_number(compressor)
&& this.right.is_number(compressor);
});
def(AST_Assign, function(compressor){
return binary(this.operator.slice(0, -1))
|| this.operator == "=" && this.right.is_number(compressor);
});
def(AST_Seq, function(compressor){
...lift_sequences = function (compressor){
if (compressor.option("sequences")) {
if (this.expression instanceof AST_Seq) {
var seq = this.expression;
var x = seq.to_array();
var e = this.clone();
e.expression = x.pop();
x.push(e);
seq = AST_Seq.from_array(x).transform(compressor);
return seq;
}
}
return this;
}...
return seq;
}
}
return this;
});
OPT(AST_UnaryPostfix, function(self, compressor){
return self.lift_sequences(compressor);
});
OPT(AST_UnaryPrefix, function(self, compressor){
var e = self.expression;
if (self.operator == "delete"
&& !(e instanceof AST_SymbolRef
|| e instanceof AST_PropAccess
...needs_parens = function (output){
var p = output.parent();
return p instanceof AST_PropAccess && p.expression === this
|| p instanceof AST_Call && p.expression === this;
}...
}
function doit() {
self.add_comments(stream);
self.add_source_map(stream);
generator(self, stream);
}
stream.push_node(self);
if (force_parens || self.needs_parens(stream)) {
stream.with_parens(doit);
} else {
doit();
}
stream.pop_node();
if (self instanceof AST_Scope) {
use_asm = prev_use_asm;
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_UnaryPostfix(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;
this.operator = props.operator;}}n/a
function AST_Unary(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;this.operator
= props.operator;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_UnaryPostfix(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;
this.operator = props.operator;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self.expression.print(output);
output.print(self.operator);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...function return_false() { return false; }...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...function AST_UnaryPrefix(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;this
.operator = props.operator;}}n/a
function AST_Unary(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;this.operator
= props.operator;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_UnaryPrefix(props){ if (props) { this.end = props.end;this.start = props.start;this.expression = props.expression;this
.operator = props.operator;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
var op = self.operator;
output.print(op);
if (/^[a-z]/i.test(op)
|| (/[+-]$/.test(op)
&& self.expression instanceof AST_UnaryPrefix
&& /^[+-]/.test(self.expression.operator))) {
output.space();
}
self.expression.print(output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._eq_null = function () {
return this.operator == "void";
}...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
..._eval = function (compressor){
var e = this.expression;
switch (this.operator) {
case "!": return !ev(e, compressor);
case "typeof":
// Function would be evaluated to an array and so typeof would
// incorrectly return 'object'. Hence making is a special case.
if (e instanceof AST_Function) return typeof function(){};
e = ev(e, compressor);
// typeof <RegExp> returns "object" or "function" on different platforms
// so cannot evaluate reliably
if (e instanceof RegExp) throw def;
return typeof e;
case "void": return void ev(e, compressor);
case "~": return ~ev(e, compressor);
case "-": return -ev(e, compressor);
case "+": return +ev(e, compressor);
}
throw def;
}...
// then its value is returned; otherwise the element itself
// is returned.
// They can be distinguished as constant value is never a
// descendant of AST_Node.
AST_Node.DEFMETHOD("evaluate", function(compressor){
if (!compressor.option("evaluate")) return this;
try {
var val = this._eval(compressor);
return !val || val instanceof RegExp || typeof val != "object" ? val : this;
} catch(ex) {
if (ex !== def) throw ex;
return this;
}
});
var unaryPrefix = makePredicate("! ~ - + void");
...is_boolean = function (){
return member(this.operator, unary_bool);
}...
def(AST_Node, return_false);
def(AST_UnaryPrefix, function(){
return member(this.operator, unary_bool);
});
def(AST_Binary, function(){
return member(this.operator, binary_bool) ||
( (this.operator == "&&" || this.operator == "||") &&
this.left.is_boolean() && this.right.is_boolean() );
});
def(AST_Conditional, function(){
return this.consequent.is_boolean() && this.alternative.is_boolean();
});
def(AST_Assign, function(){
return this.operator == "=" && this.right.is_boolean();
});
...is_string = function (){
return this.operator == "typeof";
}...
def(AST_Node, return_false);
def(AST_String, return_true);
def(AST_UnaryPrefix, function(){
return this.operator == "typeof";
});
def(AST_Binary, function(compressor){
return this.operator == "+" &&
(this.left.is_string(compressor) || this.right.is_string(compressor));
});
def(AST_Assign, function(compressor){
return (this.operator == "=" || this.operator == "+=") && this.right.is_string(compressor);
});
def(AST_Seq, function(compressor){
return this.cdr.is_string(compressor);
});
...negate = function (compressor, first_in_statement){
return func.call(this, compressor, first_in_statement);
}...
continue loop;
}
//---
// if (foo()) return; [ else x... ]; y... ==> if (!foo()) { x...; y... }
if (!stat.body.value && in_lambda) {
CHANGED = true;
stat = stat.clone();
stat.condition = stat.condition.negate(compressor);
var body = as_statement_array(stat.alternative).concat(ret);
var funs = extract_functions_from_statement_array(body);
stat.body = make_node(AST_BlockStatement, stat, {
body: body
});
stat.alternative = null;
ret = funs.concat([ stat.transform(compressor) ]);
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...function AST_Undefined(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
function AST_Atom(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Undefined(props){ if (props) { this.end = props.end;this.start = props.start;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
...function return_true() { return true; }...
}
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) {
AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
var pure_getters = compressor.option("pure_getters");
return !pure_getters || this._eq_null(pure_getters);
});
function is_strict(pure_getters) {
return /strict/.test(pure_getters);
}
def(AST_Node, is_strict);
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...function AST_Var(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions;}}n/a
function AST_Definitions(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions
;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_Var(props){ if (props) { this.end = props.end;this.start = props.start;this.definitions = props.definitions;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self._do_print(output, "var");
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
...function AST_VarDef(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.name = props
.name;}}n/a
function AST_Node(props){ if (props) { this.end = props.end;this.start = props.start;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_VarDef(props){ if (props) { this.end = props.end;this.start = props.start;this.value = props.value;this.name = props
.name;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
self.name.print(output);
if (self.value) {
output.space();
output.print("=");
output.space();
var p = output.parent(1);
var noin = p instanceof AST_For || p instanceof AST_ForIn;
parenthesize_for_noin(self.value, output, noin);
}
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.name._walk(visitor);
if (this.value) this.value._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...optimize = function (compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
}...
before: function(node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function AST_While(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}n/a
function AST_DWLoop(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_While(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.condition = props
.condition;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("while");
output.space();
output.with_parens(function(){
self.condition.print(output);
});
output.space();
self._do_print_body(output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.condition._walk(visitor);
this.body._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...function AST_With(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.expression = props
.expression;}}n/a
function AST_StatementWithBody(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;}}n/a
DEFMETHOD = function (name, method) {
this.prototype[name] = method;
}...
return opt;
}
});
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
...function AST_With(props){ if (props) { this.end = props.end;this.start = props.start;this.body = props.body;this.expression = props
.expression;}}...
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
clone: function(deep) {
return this._clone(deep);
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
..._codegen = function (self, output){
output.print("with");
output.space();
output.with_parens(function(){
self.expression.print(output);
});
output.space();
self._do_print_body(output);
}...
expr.print(output);
});
});
});
DEFPRINT(AST_New, function(self, output){
output.print("new");
output.space();
AST_Call.prototype._codegen(self, output);
});
AST_Seq.DEFMETHOD("_do_print", function(output){
this.car.print(output);
if (this.cdr) {
output.comma();
if (output.should_break()) {
..._walk = function (visitor) {
return visitor._visit(this, function(){
this.expression._walk(visitor);
this.body._walk(visitor);
});
}...
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
AST_Node.warn = function(txt, props) {
if (AST_Node.warn_function)
AST_Node.warn_function(string_template(txt, props));
...to_mozilla_ast = function () {
return set_moz_loc(this, handler(this));
}...
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
// Back-conversion to SpiderMonkey AST
return uAST.to_mozilla_ast();
}
```
Check out
[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/)
for details.
...transform = function (tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
y = tw.after(x, in_list);
if (y !== undefined) x = y;
}
}
tw.pop(this);
return x;
}...
var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw"
;, {
}, null);
var AST_Node = DEFNODE("Node", "start end", {
_clone: function(deep) {
if (deep) {
var self = this.clone();
return self.transform(new TreeTransformer(function(node) {
if (node !== self) {
return node.clone(true);
}
}));
}
return new this.CTOR(this);
},
...function Compressor(options, false_by_default) {
if (!(this instanceof Compressor))
return new Compressor(options, false_by_default);
TreeTransformer.call(this, this.before, this.after);
this.options = defaults(options, {
angular : false,
booleans : !false_by_default,
cascade : !false_by_default,
collapse_vars : !false_by_default,
comparisons : !false_by_default,
conditionals : !false_by_default,
dead_code : !false_by_default,
drop_console : false,
drop_debugger : !false_by_default,
evaluate : !false_by_default,
expression : false,
global_defs : {},
hoist_funs : !false_by_default,
hoist_vars : false,
if_return : !false_by_default,
join_vars : !false_by_default,
keep_fargs : true,
keep_fnames : false,
keep_infinity : false,
loops : !false_by_default,
negate_iife : !false_by_default,
passes : 1,
properties : !false_by_default,
pure_getters : !false_by_default && "strict",
pure_funcs : null,
reduce_vars : !false_by_default,
screw_ie8 : true,
sequences : !false_by_default,
side_effects : !false_by_default,
switches : !false_by_default,
top_retain : null,
toplevel : !!(options && options["top_retain"]),
unsafe : false,
unsafe_comps : false,
unsafe_math : false,
unsafe_proto : false,
unused : !false_by_default,
warnings : true,
}, true);
var pure_funcs = this.options["pure_funcs"];
if (typeof pure_funcs == "function") {
this.pure_funcs = pure_funcs;
} else {
this.pure_funcs = pure_funcs ? function(node) {
return pure_funcs.indexOf(node.expression.print_to_string()) < 0;
} : return_true;
}
var top_retain = this.options["top_retain"];
if (top_retain instanceof RegExp) {
this.top_retain = function(def) {
return top_retain.test(def.name);
};
} else if (typeof top_retain == "function") {
this.top_retain = top_retain;
} else if (top_retain) {
if (typeof top_retain == "string") {
top_retain = top_retain.split(/,/);
}
this.top_retain = function(def) {
return top_retain.indexOf(def.name) >= 0;
};
}
var sequences = this.options["sequences"];
this.sequences_limit = sequences == 1 ? 200 : sequences | 0;
this.warnings_produced = {};
}...
```javascript
function uglify(ast, options, mangle) {
// Conversion from SpiderMonkey AST to internal format
var uAST = UglifyJS.AST_Node.from_mozilla_ast(ast);
// Compression
uAST.figure_out_scope();
uAST = UglifyJS.Compressor(options).compress(uAST);
// Mangling (optional)
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
...before = function (node, descend, in_list) {
if (node._squeezed) return node;
var was_scope = false;
if (node instanceof AST_Scope) {
node = node.hoist_declarations(this);
was_scope = true;
}
// Before https://github.com/mishoo/UglifyJS2/pull/1602 AST_Node.optimize()
// would call AST_Node.transform() if a different instance of AST_Node is
// produced after OPT().
// This corrupts TreeWalker.stack, which cause AST look-ups to malfunction.
// Migrate and defer all children's AST_Node.transform() to below, which
// will now happen after this parent AST_Node has been properly substituted
// thus gives a consistent AST snapshot.
descend(node, this);
// Existing code relies on how AST_Node.optimize() worked, and omitting the
// following replacement call would result in degraded efficiency of both
// output and performance.
descend(node, this);
var opt = node.optimize(this);
if (was_scope && opt instanceof AST_Scope) {
opt.drop_unused(this);
descend(opt, this);
}
if (opt === node) opt._squeezed = true;
return opt;
}...
(function(undefined){
function _(node, descend) {
node.DEFMETHOD("transform", function(tw, in_list){
var x, y;
tw.push(this);
if (tw.before) x = tw.before(this, descend, in_list);
if (x === undefined) {
if (!tw.after) {
x = this;
descend(x, tw);
} else {
tw.stack[tw.stack.length - 1] = x = this;
descend(x, tw);
...clear_warnings = function () {
this.warnings_produced = {};
}n/a
compress = function (node) {
if (this.option("expression")) {
node = node.process_expression(true);
}
var passes = +this.options.passes || 1;
for (var pass = 0; pass < passes && pass < 3; ++pass) {
if (pass > 0 || this.option("reduce_vars"))
node.reset_opt_flags(this, true);
node = node.transform(this);
}
if (this.option("expression")) {
node = node.process_expression(false);
}
return node;
}...
```javascript
function uglify(ast, options, mangle) {
// Conversion from SpiderMonkey AST to internal format
var uAST = UglifyJS.AST_Node.from_mozilla_ast(ast);
// Compression
uAST.figure_out_scope();
uAST = UglifyJS.Compressor(options).compress(uAST);
// Mangling (optional)
if (mangle) {
uAST.figure_out_scope();
uAST.compute_char_frequency();
uAST.mangle_names();
}
...info = function () {
if (this.options.warnings == "verbose") {
AST_Node.warn.apply(AST_Node, arguments);
}
}...
if (var_defs.length === 0) {
statements[prev_stat_index] = make_node(AST_EmptyStatement, self);
var_defs_removed = true;
}
// Further optimize statement after substitution.
stat.reset_opt_flags(compressor);
compressor.info("Collapsing " + (is_constant ? "constant" : &#
x22;variable") +
" " + var_name + " [{file}:{line},{col}]", node.start);
CHANGED = true;
return value;
}
}
function process_for_angular(statements) {
...option = function (key) { return this.options[key] }...
this.warnings_produced = {};
};
Compressor.prototype = new TreeTransformer;
merge(Compressor.prototype, {
option: function(key) { return this.options[key] },
compress: function(node) {
if (this.option("expression")) {
node = node.process_expression(true);
}
var passes = +this.options.passes || 1;
for (var pass = 0; pass < passes && pass < 3; ++pass) {
if (pass > 0 || this.option("reduce_vars"))
node.reset_opt_flags(this, true);
node = node.transform(this);
...warn = function (text, props) {
if (this.options.warnings) {
// only emit unique warnings
var message = string_template(text, props);
if (!(message in this.warnings_produced)) {
this.warnings_produced[message] = true;
AST_Node.warn.apply(AST_Node, arguments);
}
}
}...
stat.definitions.forEach(function(def) {
if (def.value && def.value instanceof AST_Lambda) {
a.push(make_injector(def.value, def.name));
}
});
}
else {
compressor.warn("Unknown statement marked with @ngInject [{file
}:{line},{col}]", token);
}
}
}
}
return a;
}, []);
...function DefaultsError(msg, defs) {
this.message = msg;
this.defs = defs;
}n/a
croak = function (msg, defs) {
throw new DefaultsError(msg, defs);
}...
};
function defaults(args, defs, croak) {
if (args === true)
args = {};
var ret = args || {};
if (croak) for (var i in ret) if (HOP(ret, i) && !HOP(defs, i))
DefaultsError.croak("`" + i + "` is not a supported option"
;, defs);
for (var i in defs) if (HOP(defs, i)) {
ret[i] = (args && HOP(args, i)) ? args[i] : defs[i];
}
return ret;
};
function merge(obj, ext) {
...function DefaultsError(msg, defs) {
this.message = msg;
this.defs = defs;
}n/a
function Dictionary() {
this._values = Object.create(null);
this._size = 0;
}n/a
fromObject = function (obj) {
var dict = new Dictionary();
dict._size = merge(dict._values, obj);
return dict;
}n/a
add = function (key, val) {
if (this.has(key)) {
this.get(key).push(val);
} else {
this.set(key, [ val ]);
}
return this;
}...
};
function sequencesize_2(statements, compressor) {
function cons_seq(right) {
ret.pop();
var left = prev.body;
if (left instanceof AST_Seq) {
left.add(right);
} else {
left = AST_Seq.cons(left, right);
}
return left.transform(compressor);
};
var ret = [], prev = null;
statements.forEach(function(stat){
...del = function (key) {
if (this.has(key)) {
--this._size;
delete this._values["$" + key];
}
return this;
}...
if (vars_found > 0) {
// collect only vars which don't show up in self's arguments list
var defs = [];
vars.each(function(def, name){
if (self instanceof AST_Lambda
&& find_if(function(x){ return x.name == def.name.name },
self.argnames)) {
vars.del(name);
} else {
def = def.clone();
def.value = null;
defs.push(def);
vars.set(name, def);
}
});
...each = function (f) {
for (var i in this._values)
f(this._values[i], i.substr(1));
}...
d.fixed = false;
}
});
var tw = new TreeWalker(function(node, descend){
node._squeezed = false;
node._optimized = false;
if (reduce_vars) {
if (node instanceof AST_Toplevel) node.globals.each(reset_def);
if (node instanceof AST_Scope) node.variables.each(reset_def);
if (node instanceof AST_SymbolRef) {
var d = node.definition();
d.references.push(node);
if (d.fixed === undefined || !is_safe(d)
|| is_modified(node, 0, node.fixed_value() instanceof AST_Lambda)) {
d.fixed = false;
...get = function (key) { return this._values["$" + key] }...
self.walk(tw);
// pass 2: for every used symbol we need to walk its
// initialization code to figure out if it uses other
// symbols (that may not be in_use).
for (var i = 0; i < in_use.length; ++i) {
in_use[i].orig.forEach(function(decl){
// undeclared globals will be instanceof AST_SymbolRef
var init = initializations.get(decl.name);
if (init) init.forEach(function(init){
var tw = new TreeWalker(function(node){
if (node instanceof AST_SymbolRef) {
var node_def = node.definition();
if (!(node_def.id in in_use_ids)) {
in_use_ids[node_def.id] = true;
in_use.push(node_def);
...has = function (key) { return ("$" + key) in this._values }...
// try to merge in assignments
for (var i = 0; i < self.body.length;) {
if (self.body[i] instanceof AST_SimpleStatement) {
var expr = self.body[i].body, sym, assign;
if (expr instanceof AST_Assign
&& expr.operator == "="
&& (sym = expr.left) instanceof AST_Symbol
&& vars.has(sym.name))
{
var def = vars.get(sym.name);
if (def.value) break;
def.value = expr.right;
remove(defs, def);
defs.push(def);
self.body.splice(i, 1);
...map = function (f) {
var ret = [];
for (var i in this._values)
ret.push(f(this._values[i], i.substr(1)));
return ret;
}...
}
function process_for_angular(statements) {
function has_inject(comment) {
return /@ngInject/.test(comment.value);
}
function make_arguments_names_list(func) {
return func.argnames.map(function(sym){
return make_node(AST_String, sym, { value: sym.name });
});
}
function make_array(orig, elements) {
return make_node(AST_Array, orig, { elements: elements });
}
function make_injector(func, name) {
...set = function (key, val) {
if (!this.has(key)) ++this._size;
this._values["$" + key] = val;
return this;
}...
}
if (node instanceof AST_Defun && hoist_funs) {
hoisted.push(node);
return make_node(AST_EmptyStatement, node);
}
if (node instanceof AST_Var && hoist_vars) {
node.definitions.forEach(function(def){
vars.set(def.name.name, def);
++vars_found;
});
var seq = node.to_assignments(compressor);
var p = tt.parent();
if (p instanceof AST_ForIn && p.init === node) {
if (seq == null) {
var def = node.definitions[0].name;
...size = function () {
return this._size;
}...
});
AST_Toplevel.DEFMETHOD("def_global", function(node){
var globals = this.globals, name = node.name;
if (globals.has(name)) {
return globals.get(name);
} else {
var g = new SymbolDef(this, globals.size(), node);
g.undeclared = true;
g.global = true;
globals.set(name, g);
return g;
}
});
...toObject = function () { return this._values }n/a
function JS_Parse_Error(message, filename, line, col, pos) {
this.message = message;
this.filename = filename;
this.line = line;
this.col = col;
this.pos = pos;
}n/a
function JS_Parse_Error(message, filename, line, col, pos) {
this.message = message;
this.filename = filename;
this.line = line;
this.col = col;
this.pos = pos;
}n/a
function MAP(a, f, backwards) {
var ret = [], top = [], i;
function doit() {
var val = f(a[i], i);
var is_last = val instanceof Last;
if (is_last) val = val.v;
if (val instanceof AtTop) {
val = val.v;
if (val instanceof Splice) {
top.push.apply(top, backwards ? val.v.slice().reverse() : val.v);
} else {
top.push(val);
}
}
else if (val !== skip) {
if (val instanceof Splice) {
ret.push.apply(ret, backwards ? val.v.slice().reverse() : val.v);
} else {
ret.push(val);
}
}
return is_last;
};
if (a instanceof Array) {
if (backwards) {
for (i = a.length; --i >= 0;) if (doit()) break;
ret.reverse();
top.reverse();
} else {
for (i = 0; i < a.length; ++i) if (doit()) break;
}
}
else {
for (i in a) if (HOP(a, i)) if (doit()) break;
}
return top.concat(ret);
}n/a
at_top = function (val) { return new AtTop(val) }n/a
last = function (val) { return new Last(val) }...
// self._do_print(output);
// }
});
DEFPRINT(AST_Dot, function(self, output){
var expr = self.expression;
expr.print(output);
if (expr instanceof AST_Number && expr.getValue() >= 0) {
if (!/[xa-f.)]/i.test(output.last())) {
output.print(".");
}
}
output.print(".");
// the name after dot would be mapped about here.
output.add_mapping(self.end);
output.print_name(self.property);
...splice = function (val) { return new Splice(val) }...
parameters.push(pair.substr(splitAt + 1));
});
var wrapped_tl = "(function(" + parameters.join(",") + "){ '$ORIG'; })(" + args.join
(",") + ")";
wrapped_tl = parse(wrapped_tl);
wrapped_tl = wrapped_tl.transform(new TreeTransformer(function before(node){
if (node instanceof AST_Directive && node.value == "$ORIG") {
return MAP.splice(self.body);
}
}));
return wrapped_tl;
},
wrap_commonjs: function(name, export_all) {
var self = this;
var to_export = [];
...function SymbolDef(scope, index, orig) {
this.name = orig.name;
this.orig = [ orig ];
this.scope = scope;
this.references = [];
this.global = false;
this.mangled_name = null;
this.undeclared = false;
this.index = index;
this.id = SymbolDef.next_id++;
}n/a
mangle = function (options) {
var cache = options.cache && options.cache.props;
if (this.global && cache && cache.has(this.name)) {
this.mangled_name = cache.get(this.name);
}
else if (!this.mangled_name && !this.unmangleable(options)) {
var s = this.scope;
var sym = this.orig[0];
if (!options.screw_ie8 && sym instanceof AST_SymbolLambda)
s = s.parent_scope;
var def;
if (this.defun && (def = this.defun.variables.get(this.name))) {
this.mangled_name = def.mangled_name || def.name;
} else
this.mangled_name = s.next_mangled(options, this);
if (this.global && cache) {
cache.set(this.name, this.mangled_name);
}
}
}...
}
if (options.screw_ie8 && node instanceof AST_SymbolCatch) {
to_mangle.push(node.definition());
return;
}
});
this.walk(tw);
to_mangle.forEach(function(def){ def.mangle(options) });
if (options.cache) {
options.cache.cname = this.cname;
}
});
AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options){
...unmangleable = function (options) {
if (!options) options = {};
return (this.global && !options.toplevel)
|| this.undeclared
|| (!options.eval && (this.scope.uses_eval || this.scope.uses_with))
|| (options.keep_fnames
&& (this.orig[0] instanceof AST_SymbolLambda
|| this.orig[0] instanceof AST_SymbolDefun));
}...
|| this.orig[0] instanceof AST_SymbolDefun));
},
mangle: function(options) {
var cache = options.cache && options.cache.props;
if (this.global && cache && cache.has(this.name)) {
this.mangled_name = cache.get(this.name);
}
else if (!this.mangled_name && !this.unmangleable(options)) {
var s = this.scope;
var sym = this.orig[0];
if (!options.screw_ie8 && sym instanceof AST_SymbolLambda)
s = s.parent_scope;
var def;
if (this.defun && (def = this.defun.variables.get(this.name))) {
this.mangled_name = def.mangled_name || def.name;
...function TreeWalker(callback) {
this.visit = callback;
this.stack = [];
this.directives = Object.create(null);
}...
console.log("%s", JSON.stringify(output, null, 2));
}
function getProps(filename) {
var code = fs.readFileSync(filename, "utf8");
var ast = U2.parse(code);
ast.walk(new U2.TreeWalker(function(node){
if (node instanceof U2.AST_ObjectKeyVal) {
add(node.key);
}
else if (node instanceof U2.AST_ObjectProperty) {
add(node.key.name);
}
else if (node instanceof U2.AST_Dot) {
..._visit = function (node, descend) {
this.push(node);
var ret = this.visit(node, descend ? function(){
descend.call(node);
} : noop);
if (!ret && descend) {
descend.call(node);
}
this.pop(node);
return ret;
}...
},
$documentation: "Base class of all AST nodes",
$propdoc: {
start: "[AST_Token] The first token of this node",
end: "[AST_Token] The last token of this node"
},
_walk: function(visitor) {
return visitor._visit(this);
},
walk: function(visitor) {
return this._walk(visitor); // not sure the indirection will be any help
}
}, null);
AST_Node.warn_function = null;
...find_parent = function (type) {
var stack = this.stack;
for (var i = stack.length; --i >= 0;) {
var x = stack[i];
if (x instanceof type) return x;
}
}...
});
def(AST_SymbolRef, function(compressor, suffix){
if (!this.global()) return;
var name;
var defines = compressor.option("global_defs");
if (defines && HOP(defines, (name = this.name + suffix))) {
var node = to_node(defines[name], this);
var top = compressor.find_parent(AST_Toplevel);
node.walk(new TreeWalker(function(node) {
if (node instanceof AST_SymbolRef) {
node.scope = top;
node.thedef = top.def_global(node);
}
}));
return node;
...has_directive = function (type) {
var dir = this.directives[type];
if (dir) return dir;
var node = this.stack[this.stack.length - 1];
if (node instanceof AST_Scope) {
for (var i = 0; i < node.body.length; ++i) {
var st = node.body[i];
if (!(st instanceof AST_Directive)) break;
if (st.value == type) return st;
}
}
}...
(function(){
function OPT(node, optimizer) {
node.DEFMETHOD("optimize", function(compressor){
var self = this;
if (self._optimized) return self;
if (compressor.has_directive("use asm")) return self;
var opt = optimizer(self, compressor);
opt._optimized = true;
return opt;
});
};
OPT(AST_Node, function(self, compressor){
...in_boolean_context = function () {
var stack = this.stack;
var i = stack.length, self = stack[--i];
while (i > 0) {
var p = stack[--i];
if ((p instanceof AST_If && p.condition === self) ||
(p instanceof AST_Conditional && p.condition === self) ||
(p instanceof AST_DWLoop && p.condition === self) ||
(p instanceof AST_For && p.condition === self) ||
(p instanceof AST_UnaryPrefix && p.operator == "!" && p.expression === self))
{
return true;
}
if (!(p instanceof AST_Binary && (p.operator == "&&" || p.operator == "||")))
return false;
self = p;
}
}...
if (e) {
self.expression = e;
return self;
} else {
return make_node(AST_Undefined, self).optimize(compressor);
}
}
if (compressor.option("booleans") && compressor.in_boolean_context()) {
switch (self.operator) {
case "!":
if (e instanceof AST_UnaryPrefix && e.operator == "!") {
// !!foo ==> foo, if we're in boolean context
return e.expression;
}
if (e instanceof AST_Binary) {
...loopcontrol_target = function (node) {
var stack = this.stack;
if (node.label) for (var i = stack.length; --i >= 0;) {
var x = stack[i];
if (x instanceof AST_LabeledStatement && x.label.name == node.label.name)
return x.body;
} else for (var i = stack.length; --i >= 0;) {
var x = stack[i];
if (x instanceof AST_IterationStatement
|| node instanceof AST_Break && x instanceof AST_Switch)
return x;
}
}...
}).transform(compressor));
ret.unshift(stat);
continue loop;
}
}
var ab = aborts(stat.body);
var lct = ab instanceof AST_LoopControl ? compressor.loopcontrol_target(ab) : null;
if (ab && ((ab instanceof AST_Return && !ab.value && in_lambda)
|| (ab instanceof AST_Continue && self === loop_body(lct))
|| (ab instanceof AST_Break && lct instanceof AST_BlockStatement && self === lct))) {
if (ab.label) {
remove(ab.label.thedef.references, ab);
}
CHANGED = true;
...parent = function (n) {
return this.stack[this.stack.length - 2 - (n || 0)];
}...
descend();
safe_ids = save_ids;
return true;
}
var iife;
if (node instanceof AST_Function
&& !node.name
&& (iife = tw.parent()) instanceof AST_Call
&& iife.expression === node) {
// Virtually turn IIFE parameters into variable definitions:
// (function(a,b) {...})(c,d) => (function() {var a=c,b=d; ...})()
// So existing transformation rules can work on them.
node.argnames.forEach(function(arg, i) {
var d = arg.definition();
d.fixed = function() {
...pop = function (node) {
this.stack.pop();
if (node instanceof AST_Lambda) {
this.directives = Object.getPrototypeOf(this.directives);
}
}...
this.push(node);
var ret = this.visit(node, descend ? function(){
descend.call(node);
} : noop);
if (!ret && descend) {
descend.call(node);
}
this.pop(node);
return ret;
},
parent: function(n) {
return this.stack[this.stack.length - 2 - (n || 0)];
},
push: function (node) {
if (node instanceof AST_Lambda) {
...push = function (node) {
if (node instanceof AST_Lambda) {
this.directives = Object.create(this.directives);
} else if (node instanceof AST_Directive && !this.directives[node.value]) {
this.directives[node.value] = node;
}
this.stack.push(node);
}...
code += "this.initialize();";
code += "}}";
var ctor = new Function(code)();
if (proto) {
ctor.prototype = proto;
ctor.BASE = base;
}
if (base) base.SUBCLASSES.push(ctor);
ctor.prototype.CTOR = ctor;
ctor.PROPS = props || null;
ctor.SELF_PROPS = self_props;
ctor.SUBCLASSES = [];
if (type) {
ctor.prototype.TYPE = ctor.TYPE = type;
}
...self = function () {
return this.stack[this.stack.length - 1];
}...
function collapse_single_use_vars(statements, compressor) {
// Iterate statements backwards looking for a statement with a var/const
// declaration immediately preceding it. Grab the rightmost var definition
// and if it has exactly one reference then attempt to replace its reference
// in the statement with the var value and then erase the var definition.
var self = compressor.self();
var var_defs_removed = false;
var toplevel = compressor.option("toplevel");
for (var stat_index = statements.length; --stat_index >= 0;) {
var stat = statements[stat_index];
if (stat instanceof AST_Definitions) continue;
// Process child blocks of statement if present.
...function base54(num) {
var ret = "", base = 54;
num++;
do {
num--;
ret += String.fromCharCode(chars[num % base]);
num = Math.floor(num / base);
base = 64;
} while (num > 0);
return ret;
}n/a
consider = function (str){
for (var i = str.length; --i >= 0;) {
var code = str.charCodeAt(i);
if (code in frequency) ++frequency[code];
}
}...
}
});
AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options){
options = this._default_mangler_options(options);
var tw = new TreeWalker(function(node){
if (node instanceof AST_Constant)
base54.consider(node.print_to_string());
else if (node instanceof AST_Return)
base54.consider("return");
else if (node instanceof AST_Throw)
base54.consider("throw");
else if (node instanceof AST_Continue)
base54.consider("continue");
else if (node instanceof AST_Break)
...freq = function (){ return frequency }n/a
get = function (){ return chars }...
self.walk(tw);
// pass 2: for every used symbol we need to walk its
// initialization code to figure out if it uses other
// symbols (that may not be in_use).
for (var i = 0; i < in_use.length; ++i) {
in_use[i].orig.forEach(function(decl){
// undeclared globals will be instanceof AST_SymbolRef
var init = initializations.get(decl.name);
if (init) init.forEach(function(init){
var tw = new TreeWalker(function(node){
if (node instanceof AST_SymbolRef) {
var node_def = node.definition();
if (!(node_def.id in in_use_ids)) {
in_use_ids[node_def.id] = true;
in_use.push(node_def);
...function reset() {
frequency = Object.create(null);
chars = string.split("").map(function(ch){ return ch.charCodeAt(0) });
chars.forEach(function(ch){ frequency[ch] = 0 });
}n/a
sort = function () {
chars = mergeSort(chars, function(a, b){
if (is_digit(a) && !is_digit(b)) return 1;
if (is_digit(b) && !is_digit(a)) return -1;
return frequency[b] - frequency[a];
});
}...
base54.consider(node.name);
else if (node instanceof AST_Unary || node instanceof AST_Binary)
base54.consider(node.operator);
else if (node instanceof AST_Dot)
base54.consider(node.property);
});
this.walk(tw);
base54.sort();
});
var base54 = (function() {
var string = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_0123456789";
var chars, frequency;
function reset() {
frequency = Object.create(null);
...