# all files / broccoli-asset-rewrite/ index.js

100% Statements 81/81
91.49% Branches 43/47
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100% Lines 81/81

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     var Filter = require('broccoli-filter');
    var path = require('path');
    var Cache = require('broccoli-filter/lib/cache');

    function normalize(str) {
      return str.replace(/[\\\/]+/g, '/');
    }

    function relative(a, b) {
      Eif (/\./.test(path.basename(a))) {
        a = path.dirname(a);
      }

      var relativePath = path.relative(a, b);
      // path.relative might have added back \-s on windows
      relativePath = normalize(relativePath);
      return relativePath.charAt(0) !== '.' ? './' + relativePath : relativePath;
    }

    function AssetRewrite(inputNode, options) {
      if (!(this instanceof AssetRewrite)) {
        return new AssetRewrite(inputNode, options);
      }

      options = options || {};

      Filter.call(this, inputNode, {
        extensions: options.replaceExtensions || ['html', 'css'],
        // We should drop support for `description` in the next major release
        annotation: options.description || options.annotation
      });

      this.assetMap = options.assetMap || {};
      this.prepend = options.prepend || '';
      this.ignore = options.ignore || []; // files to ignore

      this.assetMapKeys = null;
    }

    AssetRewrite.prototype = Object.create(Filter.prototype);
    AssetRewrite.prototype.constructor = AssetRewrite;

    AssetRewrite.prototype.processAndCacheFile = function (srcDir, destDir, relativePath) {
      this._cache = new Cache();

      return Filter.prototype.processAndCacheFile.apply(this, arguments);
    }

    /**
     * Checks that file is not being ignored and destination doesn't already have a file
     * @param relativePath
     * @returns {boolean}
     */

    AssetRewrite.prototype.canProcessFile = function(relativePath) {
      if (!this.assetMapKeys) {
        this.generateAssetMapKeys();
      }

      if (!this.inverseAssetMap) {
        var inverseAssetMap = {};
        var assetMap = this.assetMap;

        Object.keys(assetMap).forEach(function(key) {
          var value = assetMap[key];
          inverseAssetMap[value] = key;
        }, this);

        this.inverseAssetMap = inverseAssetMap;
      }

      /*
       * relativePath can be fingerprinted or not.
       * Check that neither of these variations are being ignored
       */

      if (this.ignore.indexOf(relativePath) !== -1 || this.ignore.indexOf(this.inverseAssetMap[relativePath]) !== -1) {
        return false;
      }

      return Filter.prototype.canProcessFile.apply(this, arguments);
    }

    AssetRewrite.prototype.rewriteAssetPath = function (string, assetPath, replacementPath) {
      var newString = string;

      /*
       * Replace all of the assets with their new fingerprint name
       *
       * Uses a regular expression to find assets in html tags, css backgrounds, handlebars pre-compiled templates, etc.
       *
       * ["\'\\(=]{1} - Match one of "'(= exactly one time
       * \\s* - Any amount of white space
       * ( - Starts the first pattern match
       * [^"\'\\(\\)=]* - Do not match any of ^"'()= 0 or more times
       * /([.*+?^=!:${}()|\[\]\/\\])/g - Replace .*+?^=!:${}()|[]/\ in filenames with an escaped version for an exact name match
       * [^"\'\\(\\)\\\\>=]* - Do not match any of ^"'()\>= 0 or more times - Explicitly add \ here because of handlebars compilation
       * ) - End first pattern match
       * \\s* - Any amount of white space
       * [\\\\]* - Allow any amount of \ - For handlebars compilation (includes \\\)
       * \\s* - Any amount of white space
       * ["\'\\)> ]{1} - Match one of "'( > exactly one time
       */

      var re = new RegExp('["\'\\(=]{1}\\s*([^"\'\\(\\)=]*' + escapeRegExp(assetPath) + '[^"\'\\(\\)\\\\>=]*)\\s*[\\\\]*\\s*["\'\\)> ]{1}', 'g');
      var match = null;
      /*
       * This is to ignore matches that should not be changed
       * Any URL encoded match that would be ignored above will be ignored by this: "'()=\
       */
      var ignoreLibraryCode = new RegExp('(%22|%27|%5C|%28|%29|%3D)[^"\'\\(\\)=]*' + escapeRegExp(assetPath));

      while (match = re.exec(newString)) {
        var replaceString = '';
        if (ignoreLibraryCode.exec(match[1])) {
          continue;
        }

        if (this.prepend && this.prepend !== '') {
          replaceString = this.prepend + replacementPath;
        } else {
          replaceString = match[1].replace(assetPath, replacementPath);
        }

        newString = newString.replace(new RegExp(escapeRegExp(match[1]), 'g'), replaceString);
      }
      var self = this;
      return newString.replace(new RegExp('sourceMappingURL=' + escapeRegExp(assetPath)), function(wholeMatch) {
        var replaceString = replacementPath;
        if (self.prepend && self.prepend !== '' && (!/^sourceMappingURL=(http|https|\/\/)/.test(wholeMatch))) {
          replaceString = self.prepend + replacementPath;
        }
        return wholeMatch.replace(assetPath, replaceString);
      });
    };

    AssetRewrite.prototype.processString = function (string, relativePath) {
      var newString = string;

      for (var i = 0, keyLength = this.assetMapKeys.length; i < keyLength; i++) {
        var key = this.assetMapKeys[i];

        Eif (this.assetMap.hasOwnProperty(key)) {
          /*
           * Rewrite absolute URLs
           */

          newString = this.rewriteAssetPath(newString, key, this.assetMap[key]);

          /*
           * Rewrite relative URLs. If there is a prepend, use the full absolute path.
           */

          var pathDiff = relative(relativePath, key).replace(/^\.\//, "");
          var replacementDiff = relative(relativePath, this.assetMap[key]).replace(/^\.\//, "");

          if (this.prepend && this.prepend !== '') {
            replacementDiff = this.assetMap[key];
          }

          newString = this.rewriteAssetPath(newString, pathDiff, replacementDiff);
        }
      }

      return newString;
    };

    AssetRewrite.prototype.generateAssetMapKeys = function () {
      var keys = Object.keys(this.assetMap);

      keys.sort(function (a, b) {
        if (a.length < b.length) {
          return 1;
        }

        if (a.length > b.length) {
          return -1;
        }

        return 0;
      });

      this.assetMapKeys = keys;
    };

    function escapeRegExp(string) {
      return string.replace(/([.*+?^${}()|\[\]\/\\])/g, "\\$1");
    }

    module.exports = AssetRewrite;