1. module source-map-explorer
   1. function source-map-explorer.adjustSourcePaths (sizes, findRoot, finds, replaces)
   2. function source-map-explorer.commonPathPrefix (array)
   3. function source-map-explorer.computeGeneratedFileSizes (mapConsumer, generatedJs)
   4. function source-map-explorer.loadSourceMap (jsFile, mapFile)
   5. function source-map-explorer.mapKeys (obj, fn)

module source-map-explorer

function source-map-explorer.adjustSourcePaths (sizes, findRoot, finds, replaces)

• description and source-code

  function adjustSourcePaths(sizes, findRoot, finds, replaces) {
    if (findRoot) {
      var prefix = commonPathPrefix(_.keys(sizes));
      var len = prefix.length;
      if (len) {
        sizes = mapKeys(sizes, function(source) { return source.slice(len); })
      }
    }
  
    for (var i = 0; i < finds.length; i++) {
      var before = new RegExp(finds[i]),
          after = replaces[i];
      sizes = mapKeys(sizes, function(source) {
        return source.replace(before, after);
      });
    }
  
    return sizes;
  }

• example usage

  n/a

function source-map-explorer.commonPathPrefix (array)

• description and source-code

  function commonPathPrefix(array){
    if (array.length == 0) return '';
    var A= array.concat().sort(),
    a1= A[0].split(/(\/)/), a2= A[A.length-1].split(/(\/)/), L= a1.length, i= 0;
    while(i<L && a1[i] === a2[i]) i++;
    return a1.slice(0, i).join('');
  }

• example usage

  n/a

function source-map-explorer.computeGeneratedFileSizes (mapConsumer, generatedJs)

• description and source-code

  function computeGeneratedFileSizes(mapConsumer, generatedJs) {
    var lines = generatedJs.split('\n');
    var sourceExtrema = {};  // source -> {min: num, max: num}
    var numChars = 0;
    var lastSource = null;
    for (var line = 1; line <= lines.length; line++) {
      var lineText = lines[line - 1];
      var numCols = lineText.length;
      for (var column = 0; column < numCols; column++, numChars++) {
        var pos = mapConsumer.originalPositionFor({line:line, column:column});
        var source = pos.source;
        if (source == null) {
          // Often this is from the '// #sourceMap' comment itself.
          continue;
        }
  
        if (source != lastSource) {
          if (!(source in sourceExtrema)) {
            sourceExtrema[source] = {min: numChars};
            lastSource = source;
          } else {
            // source-map reports odd positions for bits between files.
          }
        } else {
          sourceExtrema[source].max = numChars;
        }
      }
    }
    return _.mapObject(sourceExtrema, function(v) {
      return v.max - v.min + 1
    });
  }

• example usage

  n/a

function source-map-explorer.loadSourceMap (jsFile, mapFile)

• description and source-code

  function loadSourceMap(jsFile, mapFile) {
    var jsData = fs.readFileSync(jsFile).toString();
  
    var mapConsumer;
    if (mapFile) {
      var sourcemapData = fs.readFileSync(mapFile).toString();
      mapConsumer = new sourcemap.SourceMapConsumer(sourcemapData);
    } else {
      // Try to read a source map from a 'sourceMappingURL' comment.
      var converter = convert.fromSource(jsData);
      if (!converter) {
        converter = convert.fromMapFileSource(jsData, path.dirname(jsFile));
      }
      if (!converter) {
        console.error('Unable to find a source map.');
        console.error('See ', SOURCE_MAP_INFO_URL);
        return null;
      }
      mapConsumer = new sourcemap.SourceMapConsumer(converter.toJSON());
    }
  
    if (!mapConsumer) {
      console.error('Unable to find a source map.');
      console.error('See ', SOURCE_MAP_INFO_URL);
      return null;
    }
  
    return {
      mapConsumer: mapConsumer,
      jsData: jsData
    };
  }

• example usage

  n/a

function source-map-explorer.mapKeys (obj, fn)

• description and source-code

  function mapKeys(obj, fn) {
    return _.object(_.map(obj, function(v, k) { return [fn(k), v]; }));
  }

• example usage

  n/a