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bower_components/l20n/dist/bundle/web/l20n.js 66.2 KB
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  (function () { 'use strict';
  
    function emit(listeners, ...args) {
      const type = args.shift();
  
      if (listeners['*']) {
        listeners['*'].slice().forEach(
          listener => listener.apply(this, args));
      }
  
      if (listeners[type]) {
        listeners[type].slice().forEach(
          listener => listener.apply(this, args));
      }
    }
  
    function addEventListener(listeners, type, listener) {
      if (!(type in listeners)) {
        listeners[type] = [];
      }
      listeners[type].push(listener);
    }
  
    function removeEventListener(listeners, type, listener) {
      const typeListeners = listeners[type];
      const pos = typeListeners.indexOf(listener);
      if (pos === -1) {
        return;
      }
  
      typeListeners.splice(pos, 1);
    }
  
    class Client {
      constructor(remote) {
        this.id = this;
        this.remote = remote;
  
        const listeners = {};
        this.on = (...args) => addEventListener(listeners, ...args);
        this.emit = (...args) => emit(listeners, ...args);
      }
  
      method(name, ...args) {
        return this.remote[name](...args);
      }
    }
  
    function broadcast(type, data) {
      Array.from(this.ctxs.keys()).forEach(
        client => client.emit(type, data));
    }
  
    function L10nError(message, id, lang) {
      this.name = 'L10nError';
      this.message = message;
      this.id = id;
      this.lang = lang;
    }
    L10nError.prototype = Object.create(Error.prototype);
    L10nError.prototype.constructor = L10nError;
  
    function load(type, url) {
      return new Promise(function(resolve, reject) {
        const xhr = new XMLHttpRequest();
  
        if (xhr.overrideMimeType) {
          xhr.overrideMimeType(type);
        }
  
        xhr.open('GET', url, true);
  
        if (type === 'application/json') {
          xhr.responseType = 'json';
        }
  
        xhr.addEventListener('load', function io_onload(e) {
          if (e.target.status === 200 || e.target.status === 0) {
            // Sinon.JS's FakeXHR doesn't have the response property
            resolve(e.target.response || e.target.responseText);
          } else {
            reject(new L10nError('Not found: ' + url));
          }
        });
        xhr.addEventListener('error', reject);
        xhr.addEventListener('timeout', reject);
  
        // the app: protocol throws on 404, see https://bugzil.la/827243
        try {
          xhr.send(null);
        } catch (e) {
          if (e.name === 'NS_ERROR_FILE_NOT_FOUND') {
            // the app: protocol throws on 404, see https://bugzil.la/827243
            reject(new L10nError('Not found: ' + url));
          } else {
            throw e;
          }
        }
      });
    }
  
    const io = {
      extra: function(code, ver, path, type) {
        return navigator.mozApps.getLocalizationResource(
          code, ver, path, type);
      },
      app: function(code, ver, path, type) {
        switch (type) {
          case 'text':
            return load('text/plain', path);
          case 'json':
            return load('application/json', path);
          default:
            throw new L10nError('Unknown file type: ' + type);
        }
      },
    };
  
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    function fetchResource(res, { code, src, ver }) {
      const url = res.replace('{locale}', code);
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      const type = res.endsWith('.json') ? 'json' : 'text';
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      return io[src](code, ver, url, type);
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    }
  
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    const KNOWN_MACROS = ['plural'];
    const MAX_PLACEABLE_LENGTH = 2500;
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    // Unicode bidi isolation characters
    const FSI = '\u2068';
    const PDI = '\u2069';
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    const resolutionChain = new WeakSet();
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    function format(ctx, lang, args, entity) {
      if (typeof entity === 'string') {
        return [{}, entity];
      }
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      if (resolutionChain.has(entity)) {
        throw new L10nError('Cyclic reference detected');
      }
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      resolutionChain.add(entity);
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      let rv;
      // if format fails, we want the exception to bubble up and stop the whole
      // resolving process;  however, we still need to remove the entity from the
      // resolution chain
      try {
        rv = resolveValue(
          {}, ctx, lang, args, entity.value, entity.index);
      } finally {
        resolutionChain.delete(entity);
      }
      return rv;
    }
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    function resolveIdentifier(ctx, lang, args, id) {
      if (KNOWN_MACROS.indexOf(id) > -1) {
        return [{}, ctx._getMacro(lang, id)];
      }
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      if (args && args.hasOwnProperty(id)) {
        if (typeof args[id] === 'string' || (typeof args[id] === 'number' &&
            !isNaN(args[id]))) {
          return [{}, args[id]];
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        } else {
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          throw new L10nError('Arg must be a string or a number: ' + id);
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        }
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      }
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      // XXX: special case for Node.js where still:
      // '__proto__' in Object.create(null) => true
      if (id === '__proto__') {
        throw new L10nError('Illegal id: ' + id);
      }
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      const entity = ctx._getEntity(lang, id);
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      if (entity) {
        return format(ctx, lang, args, entity);
      }
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      throw new L10nError('Unknown reference: ' + id);
    }
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    function subPlaceable(locals, ctx, lang, args, id) {
      let newLocals, value;
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      try {
        [newLocals, value] = resolveIdentifier(ctx, lang, args, id);
      } catch (err) {
        return [{ error: err }, FSI + '{{ ' + id + ' }}' + PDI];
      }
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      if (typeof value === 'number') {
        const formatter = ctx._getNumberFormatter(lang);
        return [newLocals, formatter.format(value)];
      }
  
      if (typeof value === 'string') {
        // prevent Billion Laughs attacks
        if (value.length >= MAX_PLACEABLE_LENGTH) {
          throw new L10nError('Too many characters in placeable (' +
                              value.length + ', max allowed is ' +
                              MAX_PLACEABLE_LENGTH + ')');
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        }
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        return [newLocals, FSI + value + PDI];
      }
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      return [{}, FSI + '{{ ' + id + ' }}' + PDI];
    }
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    function interpolate(locals, ctx, lang, args, arr) {
      return arr.reduce(function([localsSeq, valueSeq], cur) {
        if (typeof cur === 'string') {
          return [localsSeq, valueSeq + cur];
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        } else {
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          const [, value] = subPlaceable(locals, ctx, lang, args, cur.name);
          // wrap the substitution in bidi isolate characters
          return [localsSeq, valueSeq + value];
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        }
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      }, [locals, '']);
    }
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    function resolveSelector(ctx, lang, args, expr, index) {
      //XXX: Dehardcode!!!
      let selectorName;
      if (index[0].type === 'call' && index[0].expr.type === 'prop' &&
          index[0].expr.expr.name === 'cldr') {
        selectorName = 'plural';
      } else {
        selectorName = index[0].name;
      }
      const selector = resolveIdentifier(ctx, lang, args, selectorName)[1];
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      if (typeof selector !== 'function') {
        // selector is a simple reference to an entity or args
        return selector;
      }
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      const argValue = index[0].args ?
        resolveIdentifier(ctx, lang, args, index[0].args[0].name)[1] : undefined;
  
      if (selectorName === 'plural') {
        // special cases for zero, one, two if they are defined on the hash
        if (argValue === 0 && 'zero' in expr) {
          return 'zero';
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        }
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        if (argValue === 1 && 'one' in expr) {
          return 'one';
        }
        if (argValue === 2 && 'two' in expr) {
          return 'two';
        }
      }
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      return selector(argValue);
    }
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    function resolveValue(locals, ctx, lang, args, expr, index) {
      if (!expr) {
        return [locals, expr];
      }
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      if (typeof expr === 'string' ||
          typeof expr === 'boolean' ||
          typeof expr === 'number') {
        return [locals, expr];
      }
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      if (Array.isArray(expr)) {
        return interpolate(locals, ctx, lang, args, expr);
      }
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      // otherwise, it's a dict
      if (index) {
        // try to use the index in order to select the right dict member
        const selector = resolveSelector(ctx, lang, args, expr, index);
        if (selector in expr) {
          return resolveValue(locals, ctx, lang, args, expr[selector]);
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        }
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      }
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      // if there was no index or no selector was found, try the default
      // XXX 'other' is an artifact from Gaia
      const defaultKey = expr.__default || 'other';
      if (defaultKey in expr) {
        return resolveValue(locals, ctx, lang, args, expr[defaultKey]);
      }
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      throw new L10nError('Unresolvable value');
    }
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    const locales2rules = {
      'af': 3,
      'ak': 4,
      'am': 4,
      'ar': 1,
      'asa': 3,
      'az': 0,
      'be': 11,
      'bem': 3,
      'bez': 3,
      'bg': 3,
      'bh': 4,
      'bm': 0,
      'bn': 3,
      'bo': 0,
      'br': 20,
      'brx': 3,
      'bs': 11,
      'ca': 3,
      'cgg': 3,
      'chr': 3,
      'cs': 12,
      'cy': 17,
      'da': 3,
      'de': 3,
      'dv': 3,
      'dz': 0,
      'ee': 3,
      'el': 3,
      'en': 3,
      'eo': 3,
      'es': 3,
      'et': 3,
      'eu': 3,
      'fa': 0,
      'ff': 5,
      'fi': 3,
      'fil': 4,
      'fo': 3,
      'fr': 5,
      'fur': 3,
      'fy': 3,
      'ga': 8,
      'gd': 24,
      'gl': 3,
      'gsw': 3,
      'gu': 3,
      'guw': 4,
      'gv': 23,
      'ha': 3,
      'haw': 3,
      'he': 2,
      'hi': 4,
      'hr': 11,
      'hu': 0,
      'id': 0,
      'ig': 0,
      'ii': 0,
      'is': 3,
      'it': 3,
      'iu': 7,
      'ja': 0,
      'jmc': 3,
      'jv': 0,
      'ka': 0,
      'kab': 5,
      'kaj': 3,
      'kcg': 3,
      'kde': 0,
      'kea': 0,
      'kk': 3,
      'kl': 3,
      'km': 0,
      'kn': 0,
      'ko': 0,
      'ksb': 3,
      'ksh': 21,
      'ku': 3,
      'kw': 7,
      'lag': 18,
      'lb': 3,
      'lg': 3,
      'ln': 4,
      'lo': 0,
      'lt': 10,
      'lv': 6,
      'mas': 3,
      'mg': 4,
      'mk': 16,
      'ml': 3,
      'mn': 3,
      'mo': 9,
      'mr': 3,
      'ms': 0,
      'mt': 15,
      'my': 0,
      'nah': 3,
      'naq': 7,
      'nb': 3,
      'nd': 3,
      'ne': 3,
      'nl': 3,
      'nn': 3,
      'no': 3,
      'nr': 3,
      'nso': 4,
      'ny': 3,
      'nyn': 3,
      'om': 3,
      'or': 3,
      'pa': 3,
      'pap': 3,
      'pl': 13,
      'ps': 3,
      'pt': 3,
      'rm': 3,
      'ro': 9,
      'rof': 3,
      'ru': 11,
      'rwk': 3,
      'sah': 0,
      'saq': 3,
      'se': 7,
      'seh': 3,
      'ses': 0,
      'sg': 0,
      'sh': 11,
      'shi': 19,
      'sk': 12,
      'sl': 14,
      'sma': 7,
      'smi': 7,
      'smj': 7,
      'smn': 7,
      'sms': 7,
      'sn': 3,
      'so': 3,
      'sq': 3,
      'sr': 11,
      'ss': 3,
      'ssy': 3,
      'st': 3,
      'sv': 3,
      'sw': 3,
      'syr': 3,
      'ta': 3,
      'te': 3,
      'teo': 3,
      'th': 0,
      'ti': 4,
      'tig': 3,
      'tk': 3,
      'tl': 4,
      'tn': 3,
      'to': 0,
      'tr': 0,
      'ts': 3,
      'tzm': 22,
      'uk': 11,
      'ur': 3,
      've': 3,
      'vi': 0,
      'vun': 3,
      'wa': 4,
      'wae': 3,
      'wo': 0,
      'xh': 3,
      'xog': 3,
      'yo': 0,
      'zh': 0,
      'zu': 3
    };
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    // utility functions for plural rules methods
    function isIn(n, list) {
      return list.indexOf(n) !== -1;
    }
    function isBetween(n, start, end) {
      return typeof n === typeof start && start <= n && n <= end;
    }
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    // list of all plural rules methods:
    // map an integer to the plural form name to use
    const pluralRules = {
      '0': function() {
        return 'other';
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      },
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      '1': function(n) {
        if ((isBetween((n % 100), 3, 10))) {
          return 'few';
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        }
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        if (n === 0) {
          return 'zero';
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        }
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        if ((isBetween((n % 100), 11, 99))) {
          return 'many';
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        }
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        if (n === 2) {
          return 'two';
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        }
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        if (n === 1) {
          return 'one';
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        }
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        return 'other';
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      },
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      '2': function(n) {
        if (n !== 0 && (n % 10) === 0) {
          return 'many';
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        }
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        if (n === 2) {
          return 'two';
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        }
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        if (n === 1) {
          return 'one';
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        }
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        return 'other';
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      },
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      '3': function(n) {
        if (n === 1) {
          return 'one';
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        }
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        return 'other';
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      },
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      '4': function(n) {
        if ((isBetween(n, 0, 1))) {
          return 'one';
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        }
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        return 'other';
      },
      '5': function(n) {
        if ((isBetween(n, 0, 2)) && n !== 2) {
          return 'one';
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        }
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        return 'other';
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      },
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      '6': function(n) {
        if (n === 0) {
          return 'zero';
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        }
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        if ((n % 10) === 1 && (n % 100) !== 11) {
          return 'one';
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        }
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        return 'other';
0e9aeacd   root   localization l20n
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      },
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      '7': function(n) {
        if (n === 2) {
          return 'two';
0e9aeacd   root   localization l20n
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        }
a1a3bc73   Luigi Serra   graphs updates
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        if (n === 1) {
          return 'one';
0e9aeacd   root   localization l20n
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        }
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        return 'other';
0e9aeacd   root   localization l20n
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      },
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      '8': function(n) {
        if ((isBetween(n, 3, 6))) {
          return 'few';
0e9aeacd   root   localization l20n
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        }
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        if ((isBetween(n, 7, 10))) {
          return 'many';
        }
        if (n === 2) {
          return 'two';
        }
        if (n === 1) {
          return 'one';
        }
        return 'other';
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      },
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      '9': function(n) {
        if (n === 0 || n !== 1 && (isBetween((n % 100), 1, 19))) {
          return 'few';
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        }
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        if (n === 1) {
          return 'one';
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        }
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        return 'other';
      },
      '10': function(n) {
        if ((isBetween((n % 10), 2, 9)) && !(isBetween((n % 100), 11, 19))) {
          return 'few';
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        }
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        if ((n % 10) === 1 && !(isBetween((n % 100), 11, 19))) {
          return 'one';
        }
        return 'other';
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      },
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      '11': function(n) {
        if ((isBetween((n % 10), 2, 4)) && !(isBetween((n % 100), 12, 14))) {
          return 'few';
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        }
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        if ((n % 10) === 0 ||
            (isBetween((n % 10), 5, 9)) ||
            (isBetween((n % 100), 11, 14))) {
          return 'many';
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        }
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        if ((n % 10) === 1 && (n % 100) !== 11) {
          return 'one';
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        }
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        return 'other';
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      },
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      '12': function(n) {
        if ((isBetween(n, 2, 4))) {
          return 'few';
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        }
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        if (n === 1) {
          return 'one';
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        }
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        return 'other';
      },
      '13': function(n) {
        if ((isBetween((n % 10), 2, 4)) && !(isBetween((n % 100), 12, 14))) {
          return 'few';
        }
        if (n !== 1 && (isBetween((n % 10), 0, 1)) ||
            (isBetween((n % 10), 5, 9)) ||
            (isBetween((n % 100), 12, 14))) {
          return 'many';
        }
        if (n === 1) {
          return 'one';
        }
        return 'other';
      },
      '14': function(n) {
        if ((isBetween((n % 100), 3, 4))) {
          return 'few';
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        }
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        if ((n % 100) === 2) {
          return 'two';
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        }
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        if ((n % 100) === 1) {
          return 'one';
        }
        return 'other';
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      },
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      '15': function(n) {
        if (n === 0 || (isBetween((n % 100), 2, 10))) {
          return 'few';
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        }
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        if ((isBetween((n % 100), 11, 19))) {
          return 'many';
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        }
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        if (n === 1) {
          return 'one';
        }
        return 'other';
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      },
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      '16': function(n) {
        if ((n % 10) === 1 && n !== 11) {
          return 'one';
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        }
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        return 'other';
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      },
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      '17': function(n) {
        if (n === 3) {
          return 'few';
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        }
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        if (n === 0) {
          return 'zero';
        }
        if (n === 6) {
          return 'many';
        }
        if (n === 2) {
          return 'two';
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        }
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        if (n === 1) {
          return 'one';
        }
        return 'other';
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      },
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      '18': function(n) {
        if (n === 0) {
          return 'zero';
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        }
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        if ((isBetween(n, 0, 2)) && n !== 0 && n !== 2) {
          return 'one';
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        }
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        return 'other';
      },
      '19': function(n) {
        if ((isBetween(n, 2, 10))) {
          return 'few';
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        }
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        if ((isBetween(n, 0, 1))) {
          return 'one';
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        }
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        return 'other';
      },
      '20': function(n) {
        if ((isBetween((n % 10), 3, 4) || ((n % 10) === 9)) && !(
            isBetween((n % 100), 10, 19) ||
            isBetween((n % 100), 70, 79) ||
            isBetween((n % 100), 90, 99)
            )) {
          return 'few';
        }
        if ((n % 1000000) === 0 && n !== 0) {
          return 'many';
        }
        if ((n % 10) === 2 && !isIn((n % 100), [12, 72, 92])) {
          return 'two';
        }
        if ((n % 10) === 1 && !isIn((n % 100), [11, 71, 91])) {
          return 'one';
        }
        return 'other';
      },
      '21': function(n) {
        if (n === 0) {
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          return 'zero';
        }
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        if (n === 1) {
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          return 'one';
        }
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        return 'other';
      },
      '22': function(n) {
        if ((isBetween(n, 0, 1)) || (isBetween(n, 11, 99))) {
          return 'one';
        }
        return 'other';
      },
      '23': function(n) {
        if ((isBetween((n % 10), 1, 2)) || (n % 20) === 0) {
          return 'one';
        }
        return 'other';
      },
      '24': function(n) {
        if ((isBetween(n, 3, 10) || isBetween(n, 13, 19))) {
          return 'few';
        }
        if (isIn(n, [2, 12])) {
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          return 'two';
        }
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        if (isIn(n, [1, 11])) {
          return 'one';
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        }
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        return 'other';
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      }
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736
    };
0e9aeacd   root   localization l20n
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    function getPluralRule(code) {
      // return a function that gives the plural form name for a given integer
      const index = locales2rules[code.replace(/-.*$/, '')];
      if (!(index in pluralRules)) {
        return function() { return 'other'; };
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      }
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      return pluralRules[index];
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    }
  
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    // Safari 9 and iOS 9 does not support Intl
    const L20nIntl = typeof Intl !== 'undefined' ?
      Intl : {
      NumberFormat: function() {
        return {
          format: function(v) {
            return v;
          }
        };
      }
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    };
  
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    class Context {
      constructor(env, langs, resIds) {
        this.langs = langs;
        this.resIds = resIds;
        this.env = env;
        this.emit = (type, evt) => env.emit(type, evt, this);
      }
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      _formatTuple(lang, args, entity, id, key) {
        try {
          return format(this, lang, args, entity);
        } catch (err) {
          err.id = key ? id + '::' + key : id;
          err.lang = lang;
          this.emit('resolveerror', err);
          return [{ error: err }, err.id];
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        }
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      }
  
      _formatEntity(lang, args, entity, id) {
        const [, value] = this._formatTuple(lang, args, entity, id);
  
        const formatted = {
          value,
          attrs: null,
        };
  
        if (entity.attrs) {
          formatted.attrs = Object.create(null);
          for (let key in entity.attrs) {
            /* jshint -W089 */
            const [, attrValue] = this._formatTuple(
              lang, args, entity.attrs[key], id, key);
            formatted.attrs[key] = attrValue;
          }
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        }
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        return formatted;
      }
  
      _formatValue(lang, args, entity, id) {
        return this._formatTuple(lang, args, entity, id)[1];
      }
  
      fetch(langs = this.langs) {
        if (langs.length === 0) {
          return Promise.resolve(langs);
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        }
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        return Promise.all(
          this.resIds.map(
            resId => this.env._getResource(langs[0], resId))
        ).then(() => langs);
      }
  
      _resolve(langs, keys, formatter, prevResolved) {
        const lang = langs[0];
  
        if (!lang) {
          return reportMissing.call(this, keys, formatter, prevResolved);
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        }
a1a3bc73   Luigi Serra   graphs updates
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        let hasUnresolved = false;
  
        const resolved = keys.map((key, i) => {
          if (prevResolved && prevResolved[i] !== undefined) {
            return prevResolved[i];
          }
          const [id, args] = Array.isArray(key) ?
            key : [key, undefined];
          const entity = this._getEntity(lang, id);
  
          if (entity) {
            return formatter.call(this, lang, args, entity, id);
          }
  
          this.emit('notfounderror',
            new L10nError('"' + id + '"' + ' not found in ' + lang.code,
              id, lang));
          hasUnresolved = true;
        });
  
        if (!hasUnresolved) {
          return resolved;
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        }
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        return this.fetch(langs.slice(1)).then(
          nextLangs => this._resolve(nextLangs, keys, formatter, resolved));
      }
  
      formatEntities(...keys) {
        return this.fetch().then(
          langs => this._resolve(langs, keys, this._formatEntity));
      }
  
      formatValues(...keys) {
        return this.fetch().then(
          langs => this._resolve(langs, keys, this._formatValue));
      }
  
      _getEntity(lang, id) {
        const cache = this.env.resCache;
  
        // Look for `id` in every resource in order.
        for (let i = 0, resId; resId = this.resIds[i]; i++) {
          const resource = cache.get(resId + lang.code + lang.src);
          if (resource instanceof L10nError) {
            continue;
          }
          if (id in resource) {
            return resource[id];
          }
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        }
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        return undefined;
      }
  
      _getNumberFormatter(lang) {
        if (!this.env.numberFormatters) {
          this.env.numberFormatters = new Map();
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        }
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        if (!this.env.numberFormatters.has(lang)) {
          const formatter = L20nIntl.NumberFormat(lang);
          this.env.numberFormatters.set(lang, formatter);
          return formatter;
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        }
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        return this.env.numberFormatters.get(lang);
      }
  
      // XXX in the future macros will be stored in localization resources together 
      // with regular entities and this method will not be needed anymore
      _getMacro(lang, id) {
        switch(id) {
          case 'plural':
            return getPluralRule(lang.code);
          default:
            return undefined;
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        }
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      }
  
    }
  
    function reportMissing(keys, formatter, resolved) {
      const missingIds = new Set();
  
      keys.forEach((key, i) => {
        if (resolved && resolved[i] !== undefined) {
          return;
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        }
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        const id = Array.isArray(key) ? key[0] : key;
        missingIds.add(id);
        resolved[i] = formatter === this._formatValue ?
          id : {value: id, attrs: null};
      });
  
      this.emit('notfounderror', new L10nError(
        '"' + Array.from(missingIds).join(', ') + '"' +
        ' not found in any language', missingIds));
  
      return resolved;
    }
  
    var MAX_PLACEABLES = 100;
  
    var PropertiesParser = {
      patterns: null,
      entryIds: null,
      emit: null,
  
      init: function() {
        this.patterns = {
          comment: /^\s*#|^\s*$/,
          entity: /^([^=\s]+)\s*=\s*(.*)$/,
          multiline: /[^\\]\\$/,
          index: /\{\[\s*(\w+)(?:\(([^\)]*)\))?\s*\]\}/i,
          unicode: /\\u([0-9a-fA-F]{1,4})/g,
          entries: /[^\r\n]+/g,
          controlChars: /\\([\\\n\r\t\b\f\{\}\"\'])/g,
          placeables: /\{\{\s*([^\s]*?)\s*\}\}/,
        };
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      },
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      parse: function(emit, source) {
        if (!this.patterns) {
          this.init();
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        }
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        this.emit = emit;
  
        var entries = {};
  
        var lines = source.match(this.patterns.entries);
        if (!lines) {
          return entries;
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        }
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        for (var i = 0; i < lines.length; i++) {
          var line = lines[i];
  
          if (this.patterns.comment.test(line)) {
            continue;
          }
  
          while (this.patterns.multiline.test(line) && i < lines.length) {
            line = line.slice(0, -1) + lines[++i].trim();
          }
  
          var entityMatch = line.match(this.patterns.entity);
          if (entityMatch) {
            try {
              this.parseEntity(entityMatch[1], entityMatch[2], entries);
            } catch (e) {
              if (!this.emit) {
                throw e;
              }
            }
          }
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        }
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        return entries;
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      },
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      parseEntity: function(id, value, entries) {
        var name, key;
  
        var pos = id.indexOf('[');
        if (pos !== -1) {
          name = id.substr(0, pos);
          key = id.substring(pos + 1, id.length - 1);
        } else {
          name = id;
          key = null;
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        }
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        var nameElements = name.split('.');
  
        if (nameElements.length > 2) {
          throw this.error('Error in ID: "' + name + '".' +
              ' Nested attributes are not supported.');
        }
  
        var attr;
        if (nameElements.length > 1) {
          name = nameElements[0];
          attr = nameElements[1];
  
          if (attr[0] === '$') {
            throw this.error('Attribute can\'t start with "$"');
          }
        } else {
          attr = null;
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        }
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        this.setEntityValue(name, attr, key, this.unescapeString(value), entries);
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      },
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      setEntityValue: function(id, attr, key, rawValue, entries) {
        var value = rawValue.indexOf('{{') > -1 ?
          this.parseString(rawValue) : rawValue;
  
        var isSimpleValue = typeof value === 'string';
        var root = entries;
  
        var isSimpleNode = typeof entries[id] === 'string';
  
        if (!entries[id] && (attr || key || !isSimpleValue)) {
          entries[id] = Object.create(null);
          isSimpleNode = false;
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        }
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        if (attr) {
          if (isSimpleNode) {
            const val = entries[id];
            entries[id] = Object.create(null);
            entries[id].value = val;
          }
          if (!entries[id].attrs) {
            entries[id].attrs = Object.create(null);
          }
          if (!entries[id].attrs && !isSimpleValue) {
            entries[id].attrs[attr] = Object.create(null);
          }
          root = entries[id].attrs;
          id = attr;
0e9aeacd   root   localization l20n
1039
        }
a1a3bc73   Luigi Serra   graphs updates
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
  
        if (key) {
          isSimpleNode = false;
          if (typeof root[id] === 'string') {
            const val = root[id];
            root[id] = Object.create(null);
            root[id].index = this.parseIndex(val);
            root[id].value = Object.create(null);
          }
          root = root[id].value;
          id = key;
          isSimpleValue = true;
0e9aeacd   root   localization l20n
1052
        }
a1a3bc73   Luigi Serra   graphs updates
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
  
        if (isSimpleValue) {
          if (id in root) {
            throw this.error('Duplicated id: ' + id);
          }
          root[id] = value;
        } else {
          if (!root[id]) {
            root[id] = Object.create(null);
          }
          root[id].value = value;
0e9aeacd   root   localization l20n
1064
        }
0e9aeacd   root   localization l20n
1065
      },
a1a3bc73   Luigi Serra   graphs updates
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
  
      parseString: function(str) {
        var chunks = str.split(this.patterns.placeables);
        var complexStr = [];
  
        var len = chunks.length;
        var placeablesCount = (len - 1) / 2;
  
        if (placeablesCount >= MAX_PLACEABLES) {
          throw this.error('Too many placeables (' + placeablesCount +
                              ', max allowed is ' + MAX_PLACEABLES + ')');
0e9aeacd   root   localization l20n
1077
        }
a1a3bc73   Luigi Serra   graphs updates
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
  
        for (var i = 0; i < chunks.length; i++) {
          if (chunks[i].length === 0) {
            continue;
          }
          if (i % 2 === 1) {
            complexStr.push({type: 'idOrVar', name: chunks[i]});
          } else {
            complexStr.push(chunks[i]);
          }
0e9aeacd   root   localization l20n
1088
        }
a1a3bc73   Luigi Serra   graphs updates
1089
        return complexStr;
0e9aeacd   root   localization l20n
1090
      },
a1a3bc73   Luigi Serra   graphs updates
1091
1092
1093
1094
  
      unescapeString: function(str) {
        if (str.lastIndexOf('\\') !== -1) {
          str = str.replace(this.patterns.controlChars, '$1');
0e9aeacd   root   localization l20n
1095
        }
a1a3bc73   Luigi Serra   graphs updates
1096
1097
1098
        return str.replace(this.patterns.unicode, function(match, token) {
          return String.fromCodePoint(parseInt(token, 16));
        });
0e9aeacd   root   localization l20n
1099
      },
a1a3bc73   Luigi Serra   graphs updates
1100
1101
1102
1103
1104
  
      parseIndex: function(str) {
        var match = str.match(this.patterns.index);
        if (!match) {
          throw new L10nError('Malformed index');
0e9aeacd   root   localization l20n
1105
        }
a1a3bc73   Luigi Serra   graphs updates
1106
1107
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1109
1110
1111
1112
1113
1114
1115
1116
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1120
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1123
        if (match[2]) {
          return [{
            type: 'call',
            expr: {
              type: 'prop',
              expr: {
                type: 'glob',
                name: 'cldr'
              },
              prop: 'plural',
              cmpt: false
            }, args: [{
              type: 'idOrVar',
              name: match[2]
            }]
          }];
        } else {
          return [{type: 'idOrVar', name: match[1]}];
0e9aeacd   root   localization l20n
1124
        }
0e9aeacd   root   localization l20n
1125
      },
a1a3bc73   Luigi Serra   graphs updates
1126
1127
1128
1129
1130
  
      error: function(msg, type = 'parsererror') {
        const err = new L10nError(msg);
        if (this.emit) {
          this.emit(type, err);
0e9aeacd   root   localization l20n
1131
        }
a1a3bc73   Luigi Serra   graphs updates
1132
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1134
1135
1136
1137
1138
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1142
1143
1144
1145
1146
        return err;
      }
    };
  
    const MAX_PLACEABLES$1 = 100;
  
    var L20nParser = {
      parse: function(emit, string) {
        this._source = string;
        this._index = 0;
        this._length = string.length;
        this.entries = Object.create(null);
        this.emit = emit;
  
        return this.getResource();
0e9aeacd   root   localization l20n
1147
      },
a1a3bc73   Luigi Serra   graphs updates
1148
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1150
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1156
1157
1158
1159
1160
1161
1162
1163
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1165
1166
1167
1168
  
      getResource: function() {
        this.getWS();
        while (this._index < this._length) {
          try {
            this.getEntry();
          } catch (e) {
            if (e instanceof L10nError) {
              // we want to recover, but we don't need it in entries
              this.getJunkEntry();
              if (!this.emit) {
                throw e;
              }
            } else {
              throw e;
            }
          }
  
          if (this._index < this._length) {
            this.getWS();
          }
0e9aeacd   root   localization l20n
1169
        }
a1a3bc73   Luigi Serra   graphs updates
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
  
        return this.entries;
      },
  
      getEntry: function() {
        if (this._source[this._index] === '<') {
          ++this._index;
          const id = this.getIdentifier();
          if (this._source[this._index] === '[') {
            ++this._index;
            return this.getEntity(id, this.getItemList(this.getExpression, ']'));
          }
          return this.getEntity(id);
0e9aeacd   root   localization l20n
1183
        }
a1a3bc73   Luigi Serra   graphs updates
1184
1185
1186
  
        if (this._source.startsWith('/*', this._index)) {
          return this.getComment();
0e9aeacd   root   localization l20n
1187
        }
a1a3bc73   Luigi Serra   graphs updates
1188
1189
  
        throw this.error('Invalid entry');
0e9aeacd   root   localization l20n
1190
      },
a1a3bc73   Luigi Serra   graphs updates
1191
1192
1193
1194
  
      getEntity: function(id, index) {
        if (!this.getRequiredWS()) {
          throw this.error('Expected white space');
0e9aeacd   root   localization l20n
1195
        }
a1a3bc73   Luigi Serra   graphs updates
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
  
        const ch = this._source[this._index];
        const hasIndex = index !== undefined;
        const value = this.getValue(ch, hasIndex, hasIndex);
        let attrs;
  
        if (value === undefined) {
          if (ch === '>') {
            throw this.error('Expected ">"');
          }
          attrs = this.getAttributes();
        } else {
          const ws1 = this.getRequiredWS();
          if (this._source[this._index] !== '>') {
            if (!ws1) {
              throw this.error('Expected ">"');
            }
            attrs = this.getAttributes();
          }
0e9aeacd   root   localization l20n
1215
        }
a1a3bc73   Luigi Serra   graphs updates
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
  
        // skip '>'
        ++this._index;
  
        if (id in this.entries) {
          throw this.error('Duplicate entry ID "' + id, 'duplicateerror');
        }
        if (!attrs && !index && typeof value === 'string') {
          this.entries[id] = value;
        } else {
          this.entries[id] = {
            value,
            attrs,
            index
          };
0e9aeacd   root   localization l20n
1231
        }
0e9aeacd   root   localization l20n
1232
      },
a1a3bc73   Luigi Serra   graphs updates
1233
1234
1235
1236
1237
1238
1239
1240
1241
  
      getValue: function(
        ch = this._source[this._index], index = false, required = true) {
        switch (ch) {
          case '\'':
          case '"':
            return this.getString(ch, 1);
          case '{':
            return this.getHash(index);
0e9aeacd   root   localization l20n
1242
        }
a1a3bc73   Luigi Serra   graphs updates
1243
1244
1245
  
        if (required) {
          throw this.error('Unknown value type');
0e9aeacd   root   localization l20n
1246
        }
a1a3bc73   Luigi Serra   graphs updates
1247
1248
  
        return;
0e9aeacd   root   localization l20n
1249
      },
a1a3bc73   Luigi Serra   graphs updates
1250
1251
1252
1253
1254
1255
  
      getWS: function() {
        let cc = this._source.charCodeAt(this._index);
        // space, \n, \t, \r
        while (cc === 32 || cc === 10 || cc === 9 || cc === 13) {
          cc = this._source.charCodeAt(++this._index);
0e9aeacd   root   localization l20n
1256
        }
0e9aeacd   root   localization l20n
1257
      },
a1a3bc73   Luigi Serra   graphs updates
1258
1259
1260
1261
1262
1263
1264
  
      getRequiredWS: function() {
        const pos = this._index;
        let cc = this._source.charCodeAt(pos);
        // space, \n, \t, \r
        while (cc === 32 || cc === 10 || cc === 9 || cc === 13) {
          cc = this._source.charCodeAt(++this._index);
0e9aeacd   root   localization l20n
1265
        }
a1a3bc73   Luigi Serra   graphs updates
1266
        return this._index !== pos;
0e9aeacd   root   localization l20n
1267
      },
a1a3bc73   Luigi Serra   graphs updates
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
  
      getIdentifier: function() {
        const start = this._index;
        let cc = this._source.charCodeAt(this._index);
  
        if ((cc >= 97 && cc <= 122) || // a-z
            (cc >= 65 && cc <= 90) ||  // A-Z
            cc === 95) {               // _
          cc = this._source.charCodeAt(++this._index);
        } else {
          throw this.error('Identifier has to start with [a-zA-Z_]');
0e9aeacd   root   localization l20n
1279
        }
a1a3bc73   Luigi Serra   graphs updates
1280
1281
1282
1283
1284
1285
  
        while ((cc >= 97 && cc <= 122) || // a-z
               (cc >= 65 && cc <= 90) ||  // A-Z
               (cc >= 48 && cc <= 57) ||  // 0-9
               cc === 95) {               // _
          cc = this._source.charCodeAt(++this._index);
0e9aeacd   root   localization l20n
1286
        }
a1a3bc73   Luigi Serra   graphs updates
1287
1288
  
        return this._source.slice(start, this._index);
0e9aeacd   root   localization l20n
1289
      },
a1a3bc73   Luigi Serra   graphs updates
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
  
      getUnicodeChar: function() {
        for (let i = 0; i < 4; i++) {
          let cc = this._source.charCodeAt(++this._index);
          if ((cc > 96 && cc < 103) || // a-f
              (cc > 64 && cc < 71) ||  // A-F
              (cc > 47 && cc < 58)) {  // 0-9
            continue;
          }
          throw this.error('Illegal unicode escape sequence');
0e9aeacd   root   localization l20n
1300
        }
a1a3bc73   Luigi Serra   graphs updates
1301
1302
1303
        this._index++;
        return String.fromCharCode(
          parseInt(this._source.slice(this._index - 4, this._index), 16));
0e9aeacd   root   localization l20n
1304
      },
a1a3bc73   Luigi Serra   graphs updates
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
  
      stringRe: /"|'|{{|\\/g,
      getString: function(opchar, opcharLen) {
        const body = [];
        let placeables = 0;
  
        this._index += opcharLen;
        const start = this._index;
  
        let bufStart = start;
        let buf = '';
  
        while (true) {
          this.stringRe.lastIndex = this._index;
          const match = this.stringRe.exec(this._source);
  
          if (!match) {
            throw this.error('Unclosed string literal');
          }
  
          if (match[0] === '"' || match[0] === '\'') {
            if (match[0] !== opchar) {
              this._index += opcharLen;
              continue;
            }
            this._index = match.index + opcharLen;
            break;
          }
  
          if (match[0] === '{{') {
            if (placeables > MAX_PLACEABLES$1 - 1) {
              throw this.error('Too many placeables, maximum allowed is ' +
                  MAX_PLACEABLES$1);
            }
            placeables++;
            if (match.index > bufStart || buf.length > 0) {
              body.push(buf + this._source.slice(bufStart, match.index));
              buf = '';
            }
            this._index = match.index + 2;
            this.getWS();
            body.push(this.getExpression());
            this.getWS();
            this._index += 2;
            bufStart = this._index;
            continue;
          }
  
          if (match[0] === '\\') {
            this._index = match.index + 1;
            const ch2 = this._source[this._index];
            if (ch2 === 'u') {
              buf += this._source.slice(bufStart, match.index) +
                this.getUnicodeChar();
            } else if (ch2 === opchar || ch2 === '\\') {
              buf += this._source.slice(bufStart, match.index) + ch2;
              this._index++;
            } else if (this._source.startsWith('{{', this._index)) {
              buf += this._source.slice(bufStart, match.index) + '{{';
              this._index += 2;
            } else {
              throw this.error('Illegal escape sequence');
            }
            bufStart = this._index;
          }
0e9aeacd   root   localization l20n
1370
        }
a1a3bc73   Luigi Serra   graphs updates
1371
1372
1373
  
        if (body.length === 0) {
          return buf + this._source.slice(bufStart, this._index - opcharLen);
0e9aeacd   root   localization l20n
1374
        }
a1a3bc73   Luigi Serra   graphs updates
1375
1376
1377
  
        if (this._index - opcharLen > bufStart || buf.length > 0) {
          body.push(buf + this._source.slice(bufStart, this._index - opcharLen));
0e9aeacd   root   localization l20n
1378
        }
a1a3bc73   Luigi Serra   graphs updates
1379
1380
  
        return body;
0e9aeacd   root   localization l20n
1381
      },
a1a3bc73   Luigi Serra   graphs updates
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
  
      getAttributes: function() {
        const attrs = Object.create(null);
  
        while (true) {
          this.getAttribute(attrs);
          const ws1 = this.getRequiredWS();
          const ch = this._source.charAt(this._index);
          if (ch === '>') {
            break;
          } else if (!ws1) {
            throw this.error('Expected ">"');
          }
0e9aeacd   root   localization l20n
1395
        }
a1a3bc73   Luigi Serra   graphs updates
1396
        return attrs;
0e9aeacd   root   localization l20n
1397
      },
a1a3bc73   Luigi Serra   graphs updates
1398
1399
1400
1401
1402
1403
1404
1405
1406
  
      getAttribute: function(attrs) {
        const key = this.getIdentifier();
        let index;
  
        if (this._source[this._index]=== '[') {
          ++this._index;
          this.getWS();
          index = this.getItemList(this.getExpression, ']');
0e9aeacd   root   localization l20n
1407
        }
a1a3bc73   Luigi Serra   graphs updates
1408
1409
1410
        this.getWS();
        if (this._source[this._index] !== ':') {
          throw this.error('Expected ":"');
0e9aeacd   root   localization l20n
1411
        }
a1a3bc73   Luigi Serra   graphs updates
1412
1413
1414
1415
1416
1417
1418
        ++this._index;
        this.getWS();
        const hasIndex = index !== undefined;
        const value = this.getValue(undefined, hasIndex);
  
        if (key in attrs) {
          throw this.error('Duplicate attribute "' + key, 'duplicateerror');
0e9aeacd   root   localization l20n
1419
        }
a1a3bc73   Luigi Serra   graphs updates
1420
1421
1422
1423
1424
1425
1426
1427
  
        if (!index && typeof value === 'string') {
          attrs[key] = value;
        } else {
          attrs[key] = {
            value,
            index
          };
0e9aeacd   root   localization l20n
1428
        }
a1a3bc73   Luigi Serra   graphs updates
1429
      },
0e9aeacd   root   localization l20n
1430
  
a1a3bc73   Luigi Serra   graphs updates
1431
1432
      getHash: function(index) {
        const items = Object.create(null);
0e9aeacd   root   localization l20n
1433
  
a1a3bc73   Luigi Serra   graphs updates
1434
1435
        ++this._index;
        this.getWS();
0e9aeacd   root   localization l20n
1436
  
a1a3bc73   Luigi Serra   graphs updates
1437
        let defKey;
0e9aeacd   root   localization l20n
1438
  
a1a3bc73   Luigi Serra   graphs updates
1439
1440
1441
        while (true) {
          const [key, value, def] = this.getHashItem();
          items[key] = value;
0e9aeacd   root   localization l20n
1442
  
a1a3bc73   Luigi Serra   graphs updates
1443
1444
1445
1446
1447
1448
1449
          if (def) {
            if (defKey) {
              throw this.error('Default item redefinition forbidden');
            }
            defKey = key;
          }
          this.getWS();
0e9aeacd   root   localization l20n
1450
  
a1a3bc73   Luigi Serra   graphs updates
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
          const comma = this._source[this._index] === ',';
          if (comma) {
            ++this._index;
            this.getWS();
          }
          if (this._source[this._index] === '}') {
            ++this._index;
            break;
          }
          if (!comma) {
            throw this.error('Expected "}"');
0e9aeacd   root   localization l20n
1462
1463
1464
          }
        }
  
a1a3bc73   Luigi Serra   graphs updates
1465
1466
1467
1468
1469
        if (defKey) {
          items.__default = defKey;
        } else if (!index) {
          throw this.error('Unresolvable Hash Value');
        }
0e9aeacd   root   localization l20n
1470
  
a1a3bc73   Luigi Serra   graphs updates
1471
1472
        return items;
      },
0e9aeacd   root   localization l20n
1473
  
a1a3bc73   Luigi Serra   graphs updates
1474
1475
1476
1477
1478
      getHashItem: function() {
        let defItem = false;
        if (this._source[this._index] === '*') {
          ++this._index;
          defItem = true;
0e9aeacd   root   localization l20n
1479
1480
        }
  
a1a3bc73   Luigi Serra   graphs updates
1481
1482
1483
1484
1485
1486
1487
        const key = this.getIdentifier();
        this.getWS();
        if (this._source[this._index] !== ':') {
          throw this.error('Expected ":"');
        }
        ++this._index;
        this.getWS();
0e9aeacd   root   localization l20n
1488
  
a1a3bc73   Luigi Serra   graphs updates
1489
1490
        return [key, this.getValue(), defItem];
      },
0e9aeacd   root   localization l20n
1491
  
a1a3bc73   Luigi Serra   graphs updates
1492
1493
1494
1495
      getComment: function() {
        this._index += 2;
        const start = this._index;
        const end = this._source.indexOf('*/', start);
0e9aeacd   root   localization l20n
1496
  
a1a3bc73   Luigi Serra   graphs updates
1497
1498
        if (end === -1) {
          throw this.error('Comment without a closing tag');
0e9aeacd   root   localization l20n
1499
1500
        }
  
a1a3bc73   Luigi Serra   graphs updates
1501
1502
        this._index = end + 2;
      },
0e9aeacd   root   localization l20n
1503
  
a1a3bc73   Luigi Serra   graphs updates
1504
1505
      getExpression: function () {
        let exp = this.getPrimaryExpression();
0e9aeacd   root   localization l20n
1506
  
a1a3bc73   Luigi Serra   graphs updates
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
        while (true) {
          let ch = this._source[this._index];
          if (ch === '.' || ch === '[') {
            ++this._index;
            exp = this.getPropertyExpression(exp, ch === '[');
          } else if (ch === '(') {
            ++this._index;
            exp = this.getCallExpression(exp);
          } else {
            break;
0e9aeacd   root   localization l20n
1517
          }
a1a3bc73   Luigi Serra   graphs updates
1518
        }
0e9aeacd   root   localization l20n
1519
  
a1a3bc73   Luigi Serra   graphs updates
1520
1521
        return exp;
      },
0e9aeacd   root   localization l20n
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      getPropertyExpression: function(idref, computed) {
        let exp;
  
        if (computed) {
          this.getWS();
          exp = this.getExpression();
          this.getWS();
          if (this._source[this._index] !== ']') {
            throw this.error('Expected "]"');
          }
          ++this._index;
        } else {
          exp = this.getIdentifier();
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        }
  
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        return {
          type: 'prop',
          expr: idref,
          prop: exp,
          cmpt: computed
        };
      },
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      getCallExpression: function(callee) {
        this.getWS();
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        return {
          type: 'call',
          expr: callee,
          args: this.getItemList(this.getExpression, ')')
        };
      },
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      getPrimaryExpression: function() {
        const ch = this._source[this._index];
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        switch (ch) {
          case '$':
            ++this._index;
            return {
              type: 'var',
              name: this.getIdentifier()
            };
          case '@':
            ++this._index;
            return {
              type: 'glob',
              name: this.getIdentifier()
            };
          default:
            return {
              type: 'id',
              name: this.getIdentifier()
            };
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        }
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      },
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      getItemList: function(callback, closeChar) {
        const items = [];
        let closed = false;
  
        this.getWS();
  
        if (this._source[this._index] === closeChar) {
          ++this._index;
          closed = true;
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        }
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        while (!closed) {
          items.push(callback.call(this));
          this.getWS();
          let ch = this._source.charAt(this._index);
          switch (ch) {
            case ',':
              ++this._index;
              this.getWS();
              break;
            case closeChar:
              ++this._index;
              closed = true;
              break;
            default:
              throw this.error('Expected "," or "' + closeChar + '"');
          }
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        }
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        return items;
      },
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      getJunkEntry: function() {
        const pos = this._index;
        let nextEntity = this._source.indexOf('<', pos);
        let nextComment = this._source.indexOf('/*', pos);
  
        if (nextEntity === -1) {
          nextEntity = this._length;
        }
        if (nextComment === -1) {
          nextComment = this._length;
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        }
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        let nextEntry = Math.min(nextEntity, nextComment);
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        this._index = nextEntry;
      },
  
      error: function(message, type = 'parsererror') {
        const pos = this._index;
  
        let start = this._source.lastIndexOf('<', pos - 1);
        const lastClose = this._source.lastIndexOf('>', pos - 1);
        start = lastClose > start ? lastClose + 1 : start;
        const context = this._source.slice(start, pos + 10);
  
        const msg = message + ' at pos ' + pos + ': `' + context + '`';
        const err = new L10nError(msg);
        if (this.emit) {
          this.emit(type, err);
        }
        return err;
      },
    };
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    // Walk an entry node searching for content leaves
    function walkEntry(entry, fn) {
      if (typeof entry === 'string') {
        return fn(entry);
      }
  
      const newEntry = Object.create(null);
  
      if (entry.value) {
        newEntry.value = walkValue(entry.value, fn);
      }
  
      if (entry.index) {
        newEntry.index = entry.index;
      }
  
      if (entry.attrs) {
        newEntry.attrs = Object.create(null);
        for (let key in entry.attrs) {
          newEntry.attrs[key] = walkEntry(entry.attrs[key], fn);
        }
      }
  
      return newEntry;
    }
  
    function walkValue(value, fn) {
      if (typeof value === 'string') {
        return fn(value);
      }
  
      // skip expressions in placeables
      if (value.type) {
        return value;
      }
  
      const newValue = Array.isArray(value) ? [] : Object.create(null);
      const keys = Object.keys(value);
  
      for (let i = 0, key; (key = keys[i]); i++) {
        newValue[key] = walkValue(value[key], fn);
      }
  
      return newValue;
    }
  
    /* Pseudolocalizations
     *
     * pseudo is a dict of strategies to be used to modify the English
     * context in order to create pseudolocalizations.  These can be used by
     * developers to test the localizability of their code without having to
     * actually speak a foreign language.
     *
     * Currently, the following pseudolocales are supported:
     *
     *   fr-x-psaccent - Ȧȧƈƈḗḗƞŧḗḗḓ Ḗḗƞɠŀīīşħ
     *
     *     In Accented English all English letters are replaced by accented
     *     Unicode counterparts which don't impair the readability of the content.
     *     This allows developers to quickly test if any given string is being
     *     correctly displayed in its 'translated' form.  Additionally, simple
     *     heuristics are used to make certain words longer to better simulate the
     *     experience of international users.
     *
     *   ar-x-psbidi - ɥsıʅƃuƎ ıpıԐ
     *
     *     Bidi English is a fake RTL locale.  All words are surrounded by
     *     Unicode formatting marks forcing the RTL directionality of characters.
     *     In addition, to make the reversed text easier to read, individual
     *     letters are flipped.
     *
     *     Note: The name above is hardcoded to be RTL in case code editors have
     *     trouble with the RLO and PDF Unicode marks.  In reality, it should be
     *     surrounded by those marks as well.
     *
     * See https://bugzil.la/900182 for more information.
     *
     */
  
    function createGetter(id, name) {
      let _pseudo = null;
  
      return function getPseudo() {
        if (_pseudo) {
          return _pseudo;
        }
  
        const reAlphas = /[a-zA-Z]/g;
        const reVowels = /[aeiouAEIOU]/g;
        const reWords = /[^\W0-9_]+/g;
        // strftime tokens (%a, %Eb), template {vars}, HTML entities (&#x202a;)
        // and HTML tags.
        const reExcluded = /(%[EO]?\w|\{\s*.+?\s*\}|&[#\w]+;|<\s*.+?\s*>)/;
  
        const charMaps = {
          'fr-x-psaccent':
            'ȦƁƇḒḖƑƓĦĪĴĶĿḾȠǾƤɊŘŞŦŬṼẆẊẎẐ[\\]^_`ȧƀƈḓḗƒɠħīĵķŀḿƞǿƥɋřşŧŭṽẇẋẏẑ',
          'ar-x-psbidi':
            // XXX Use pɟפ˥ʎ as replacements for ᗡℲ⅁⅂⅄. https://bugzil.la/1007340
            '∀ԐↃpƎɟפHIſӼ˥WNOԀÒᴚS⊥∩ɅMXʎZ[\\]ᵥ_,ɐqɔpǝɟƃɥıɾʞʅɯuodbɹsʇnʌʍxʎz',
        };
  
        const mods = {
          'fr-x-psaccent': val =>
            val.replace(reVowels, match => match + match.toLowerCase()),
  
          // Surround each word with Unicode formatting codes, RLO and PDF:
          //   U+202E:   RIGHT-TO-LEFT OVERRIDE (RLO)
          //   U+202C:   POP DIRECTIONAL FORMATTING (PDF)
          // See http://www.w3.org/International/questions/qa-bidi-controls
          'ar-x-psbidi': val =>
            val.replace(reWords, match => '\u202e' + match + '\u202c'),
        };
  
        // Replace each Latin letter with a Unicode character from map
        const replaceChars =
          (map, val) => val.replace(
            reAlphas, match => map.charAt(match.charCodeAt(0) - 65));
  
        const transform =
          val => replaceChars(charMaps[id], mods[id](val));
  
        // apply fn to translatable parts of val
        const apply = (fn, val) => {
          if (!val) {
            return val;
          }
  
          const parts = val.split(reExcluded);
          const modified = parts.map(function(part) {
            if (reExcluded.test(part)) {
              return part;
            }
            return fn(part);
          });
          return modified.join('');
        };
  
        return _pseudo = {
          name: transform(name),
          process: str => apply(transform, str)
        };
      };
    }
  
    const pseudo = Object.defineProperties(Object.create(null), {
      'fr-x-psaccent': {
        enumerable: true,
        get: createGetter('fr-x-psaccent', 'Runtime Accented')
      },
      'ar-x-psbidi': {
        enumerable: true,
        get: createGetter('ar-x-psbidi', 'Runtime Bidi')
      }
    });
  
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    class Env {
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      constructor(fetchResource) {
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        this.fetchResource = fetchResource;
  
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        this.resCache = new Map();
        this.resRefs = new Map();
        this.numberFormatters = null;
        this.parsers = {
          properties: PropertiesParser,
          l20n: L20nParser,
        };
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        const listeners = {};
        this.emit = emit.bind(this, listeners);
        this.addEventListener = addEventListener.bind(this, listeners);
        this.removeEventListener = removeEventListener.bind(this, listeners);
      }
  
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      createContext(langs, resIds) {
        const ctx = new Context(this, langs, resIds);
        resIds.forEach(resId => {
          const usedBy = this.resRefs.get(resId) || 0;
          this.resRefs.set(resId, usedBy + 1);
        });
  
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        return ctx;
      }
  
      destroyContext(ctx) {
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        ctx.resIds.forEach(resId => {
          const usedBy = this.resRefs.get(resId) || 0;
  
          if (usedBy > 1) {
            return this.resRefs.set(resId, usedBy - 1);
          }
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          this.resRefs.delete(resId);
          this.resCache.forEach((val, key) =>
            key.startsWith(resId) ? this.resCache.delete(key) : null);
        });
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      }
  
      _parse(syntax, lang, data) {
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        const parser = this.parsers[syntax];
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        if (!parser) {
          return data;
        }
  
        const emit = (type, err) => this.emit(type, amendError(lang, err));
        return parser.parse.call(parser, emit, data);
      }
  
      _create(lang, entries) {
        if (lang.src !== 'pseudo') {
          return entries;
        }
  
        const pseudoentries = Object.create(null);
        for (let key in entries) {
          pseudoentries[key] = walkEntry(
            entries[key], pseudo[lang.code].process);
        }
        return pseudoentries;
      }
  
      _getResource(lang, res) {
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        const cache = this.resCache;
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        const id = res + lang.code + lang.src;
  
        if (cache.has(id)) {
          return cache.get(id);
        }
  
        const syntax = res.substr(res.lastIndexOf('.') + 1);
  
        const saveEntries = data => {
          const entries = this._parse(syntax, lang, data);
          cache.set(id, this._create(lang, entries));
        };
  
        const recover = err => {
          err.lang = lang;
          this.emit('fetcherror', err);
          cache.set(id, err);
        };
  
        const langToFetch = lang.src === 'pseudo' ?
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          { code: 'en-US', src: 'app', ver: lang.ver } :
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          lang;
  
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        const resource = this.fetchResource(res, langToFetch)
          .then(saveEntries, recover);
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        cache.set(id, resource);
  
        return resource;
      }
    }
  
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    function amendError(lang, err) {
      err.lang = lang;
      return err;
    }
  
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    function prioritizeLocales(def, availableLangs, requested) {
      let supportedLocale;
      // Find the first locale in the requested list that is supported.
      for (let i = 0; i < requested.length; i++) {
        const locale = requested[i];
        if (availableLangs.indexOf(locale) !== -1) {
          supportedLocale = locale;
          break;
        }
      }
      if (!supportedLocale ||
          supportedLocale === def) {
        return [def];
      }
  
      return [supportedLocale, def];
    }
  
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    function negotiateLanguages(
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      { appVersion, defaultLang, availableLangs }, additionalLangs, prevLangs,
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      requestedLangs) {
  
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      const allAvailableLangs = Object.keys(availableLangs)
        .concat(Object.keys(additionalLangs))
        .concat(Object.keys(pseudo));
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      const newLangs = prioritizeLocales(
        defaultLang, allAvailableLangs, requestedLangs);
  
      const langs = newLangs.map(code => ({
        code: code,
        src: getLangSource(appVersion, availableLangs, additionalLangs, code),
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        ver: appVersion,
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      }));
  
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      return { langs, haveChanged: !arrEqual(prevLangs, newLangs) };
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    }
  
    function arrEqual(arr1, arr2) {
      return arr1.length === arr2.length &&
        arr1.every((elem, i) => elem === arr2[i]);
    }
  
    function getMatchingLangpack(appVersion, langpacks) {
      for (let i = 0, langpack; (langpack = langpacks[i]); i++) {
        if (langpack.target === appVersion) {
          return langpack;
        }
      }
      return null;
    }
  
    function getLangSource(appVersion, availableLangs, additionalLangs, code) {
      if (additionalLangs && additionalLangs[code]) {
        const lp = getMatchingLangpack(appVersion, additionalLangs[code]);
        if (lp &&
            (!(code in availableLangs) ||
             parseInt(lp.revision) > availableLangs[code])) {
          return 'extra';
        }
      }
  
      if ((code in pseudo) && !(code in availableLangs)) {
        return 'pseudo';
      }
  
      return 'app';
    }
  
    class Remote {
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      constructor(fetchResource, broadcast) {
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        this.broadcast = broadcast;
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        this.env = new Env(fetchResource);
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        this.ctxs = new Map();
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      }
  
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      registerView(view, resources, meta, additionalLangs, requestedLangs) {
        const { langs } = negotiateLanguages(
          meta, additionalLangs, [], requestedLangs);
        this.ctxs.set(view, this.env.createContext(langs, resources));
        return langs;
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      }
  
      unregisterView(view) {
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        this.ctxs.delete(view);
        return true;
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      }
  
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      formatEntities(view, keys) {
        return this.ctxs.get(view).formatEntities(...keys);
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      }
  
      formatValues(view, keys) {
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        return this.ctxs.get(view).formatValues(...keys);
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      }
  
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      changeLanguages(view, meta, additionalLangs, requestedLangs) {
        const oldCtx = this.ctxs.get(view);
        const prevLangs = oldCtx.langs;
        const newLangs = negotiateLanguages(
          meta, additionalLangs, prevLangs, requestedLangs);
        this.ctxs.set(view, this.env.createContext(
          newLangs.langs, oldCtx.resIds));
        return newLangs;
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      }
  
      requestLanguages(requestedLangs) {
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        this.broadcast('languageschangerequest', requestedLangs);
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      }
  
      getName(code) {
        return pseudo[code].name;
      }
  
      processString(code, str) {
        return pseudo[code].process(str);
      }
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    }
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    const observerConfig = {
      attributes: true,
      characterData: false,
      childList: true,
      subtree: true,
      attributeFilter: ['data-l10n-id', 'data-l10n-args']
    };
  
    const observers = new WeakMap();
  
    function initMutationObserver(view) {
      observers.set(view, {
        roots: new Set(),
        observer: new MutationObserver(
          mutations => translateMutations(view, mutations)),
      });
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    }
  
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    function translateRoots(view) {
      return Promise.all(
        [...observers.get(view).roots].map(
          root => translateFragment(view, root)));
    }
  
    function observe(view, root) {
      const obs = observers.get(view);
      if (obs) {
        obs.roots.add(root);
        obs.observer.observe(root, observerConfig);
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      }
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    }
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    function disconnect(view, root, allRoots) {
      const obs = observers.get(view);
      if (obs) {
        obs.observer.disconnect();
        if (allRoots) {
          return;
        }
        obs.roots.delete(root);
        obs.roots.forEach(
          other => obs.observer.observe(other, observerConfig));
      }
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    }
  
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    function reconnect(view) {
      const obs = observers.get(view);
      if (obs) {
        obs.roots.forEach(
          root => obs.observer.observe(root, observerConfig));
      }
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    }
  
    // match the opening angle bracket (<) in HTML tags, and HTML entities like
    // &amp;, &#0038;, &#x0026;.
    const reOverlay = /<|&#?\w+;/;
  
    const allowed = {
      elements: [
        'a', 'em', 'strong', 'small', 's', 'cite', 'q', 'dfn', 'abbr', 'data',
        'time', 'code', 'var', 'samp', 'kbd', 'sub', 'sup', 'i', 'b', 'u',
        'mark', 'ruby', 'rt', 'rp', 'bdi', 'bdo', 'span', 'br', 'wbr'
      ],
      attributes: {
        global: [ 'title', 'aria-label', 'aria-valuetext', 'aria-moz-hint' ],
        a: [ 'download' ],
        area: [ 'download', 'alt' ],
        // value is special-cased in isAttrAllowed
        input: [ 'alt', 'placeholder' ],
        menuitem: [ 'label' ],
        menu: [ 'label' ],
        optgroup: [ 'label' ],
        option: [ 'label' ],
        track: [ 'label' ],
        img: [ 'alt' ],
        textarea: [ 'placeholder' ],
        th: [ 'abbr']
      }
    };
  
    function overlayElement(element, translation) {
      const value = translation.value;
  
      if (typeof value === 'string') {
        if (!reOverlay.test(value)) {
          element.textContent = value;
        } else {
          // start with an inert template element and move its children into
          // `element` but such that `element`'s own children are not replaced
          const tmpl = element.ownerDocument.createElement('template');
          tmpl.innerHTML = value;
          // overlay the node with the DocumentFragment
          overlay(element, tmpl.content);
        }
      }
  
      for (let key in translation.attrs) {
        const attrName = camelCaseToDashed(key);
        if (isAttrAllowed({ name: attrName }, element)) {
          element.setAttribute(attrName, translation.attrs[key]);
        }
      }
    }
  
    // The goal of overlay is to move the children of `translationElement`
    // into `sourceElement` such that `sourceElement`'s own children are not
    // replaced, but onle have their text nodes and their attributes modified.
    //
    // We want to make it possible for localizers to apply text-level semantics to
    // the translations and make use of HTML entities. At the same time, we
    // don't trust translations so we need to filter unsafe elements and
    // attribtues out and we don't want to break the Web by replacing elements to
    // which third-party code might have created references (e.g. two-way
    // bindings in MVC frameworks).
    function overlay(sourceElement, translationElement) {
      const result = translationElement.ownerDocument.createDocumentFragment();
      let k, attr;
  
      // take one node from translationElement at a time and check it against
      // the allowed list or try to match it with a corresponding element
      // in the source
      let childElement;
      while ((childElement = translationElement.childNodes[0])) {
        translationElement.removeChild(childElement);
  
        if (childElement.nodeType === childElement.TEXT_NODE) {
          result.appendChild(childElement);
          continue;
        }
  
        const index = getIndexOfType(childElement);
        const sourceChild = getNthElementOfType(sourceElement, childElement, index);
        if (sourceChild) {
          // there is a corresponding element in the source, let's use it
          overlay(sourceChild, childElement);
          result.appendChild(sourceChild);
          continue;
        }
  
        if (isElementAllowed(childElement)) {
          const sanitizedChild = childElement.ownerDocument.createElement(
            childElement.nodeName);
          overlay(sanitizedChild, childElement);
          result.appendChild(sanitizedChild);
          continue;
        }
  
        // otherwise just take this child's textContent
        result.appendChild(
          translationElement.ownerDocument.createTextNode(
            childElement.textContent));
      }
  
      // clear `sourceElement` and append `result` which by this time contains
      // `sourceElement`'s original children, overlayed with translation
      sourceElement.textContent = '';
      sourceElement.appendChild(result);
  
      // if we're overlaying a nested element, translate the allowed
      // attributes; top-level attributes are handled in `translateElement`
      // XXX attributes previously set here for another language should be
      // cleared if a new language doesn't use them; https://bugzil.la/922577
      if (translationElement.attributes) {
        for (k = 0, attr; (attr = translationElement.attributes[k]); k++) {
          if (isAttrAllowed(attr, sourceElement)) {
            sourceElement.setAttribute(attr.name, attr.value);
          }
        }
      }
    }
  
    // XXX the allowed list should be amendable; https://bugzil.la/922573
    function isElementAllowed(element) {
      return allowed.elements.indexOf(element.tagName.toLowerCase()) !== -1;
    }
  
    function isAttrAllowed(attr, element) {
      const attrName = attr.name.toLowerCase();
      const tagName = element.tagName.toLowerCase();
      // is it a globally safe attribute?
      if (allowed.attributes.global.indexOf(attrName) !== -1) {
        return true;
      }
      // are there no allowed attributes for this element?
      if (!allowed.attributes[tagName]) {
        return false;
      }
      // is it allowed on this element?
      // XXX the allowed list should be amendable; https://bugzil.la/922573
      if (allowed.attributes[tagName].indexOf(attrName) !== -1) {
        return true;
      }
      // special case for value on inputs with type button, reset, submit
      if (tagName === 'input' && attrName === 'value') {
        const type = element.type.toLowerCase();
        if (type === 'submit' || type === 'button' || type === 'reset') {
          return true;
        }
      }
      return false;
    }
  
    // Get n-th immediate child of context that is of the same type as element.
    // XXX Use querySelector(':scope > ELEMENT:nth-of-type(index)'), when:
    // 1) :scope is widely supported in more browsers and 2) it works with
    // DocumentFragments.
    function getNthElementOfType(context, element, index) {
      /* jshint boss:true */
      let nthOfType = 0;
      for (let i = 0, child; child = context.children[i]; i++) {
        if (child.nodeType === child.ELEMENT_NODE &&
            child.tagName === element.tagName) {
          if (nthOfType === index) {
            return child;
          }
          nthOfType++;
        }
      }
      return null;
    }
  
    // Get the index of the element among siblings of the same type.
    function getIndexOfType(element) {
      let index = 0;
      let child;
      while ((child = element.previousElementSibling)) {
        if (child.tagName === element.tagName) {
          index++;
        }
      }
      return index;
    }
  
    function camelCaseToDashed(string) {
      // XXX workaround for https://bugzil.la/1141934
      if (string === 'ariaValueText') {
        return 'aria-valuetext';
      }
  
      return string
        .replace(/[A-Z]/g, function (match) {
          return '-' + match.toLowerCase();
        })
        .replace(/^-/, '');
    }
  
    const reHtml = /[&<>]/g;
    const htmlEntities = {
      '&': '&amp;',
      '<': '&lt;',
      '>': '&gt;',
    };
  
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    function setAttributes(element, id, args) {
      element.setAttribute('data-l10n-id', id);
      if (args) {
        element.setAttribute('data-l10n-args', JSON.stringify(args));
      }
    }
  
    function getAttributes(element) {
      return {
        id: element.getAttribute('data-l10n-id'),
        args: JSON.parse(element.getAttribute('data-l10n-args'))
      };
    }
  
    function getTranslatables(element) {
      const nodes = Array.from(element.querySelectorAll('[data-l10n-id]'));
  
      if (typeof element.hasAttribute === 'function' &&
          element.hasAttribute('data-l10n-id')) {
        nodes.push(element);
      }
  
      return nodes;
    }
  
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    function translateMutations(view, mutations) {
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      const targets = new Set();
  
      for (let mutation of mutations) {
        switch (mutation.type) {
          case 'attributes':
            targets.add(mutation.target);
            break;
          case 'childList':
            for (let addedNode of mutation.addedNodes) {
              if (addedNode.nodeType === addedNode.ELEMENT_NODE) {
                if (addedNode.childElementCount) {
                  getTranslatables(addedNode).forEach(targets.add.bind(targets));
                } else {
                  if (addedNode.hasAttribute('data-l10n-id')) {
                    targets.add(addedNode);
                  }
                }
              }
            }
            break;
        }
      }
  
      if (targets.size === 0) {
        return;
      }
  
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      translateElements(view, Array.from(targets));
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    }
  
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    function translateFragment(view, frag) {
      return translateElements(view, getTranslatables(frag));
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    }
  
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    function getElementsTranslation(view, elems) {
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      const keys = elems.map(elem => {
        const id = elem.getAttribute('data-l10n-id');
        const args = elem.getAttribute('data-l10n-args');
        return args ? [
          id,
          JSON.parse(args.replace(reHtml, match => htmlEntities[match]))
        ] : id;
      });
  
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      return view.formatEntities(...keys);
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    }
  
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    function translateElements(view, elements) {
      return getElementsTranslation(view, elements).then(
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        translations => applyTranslations(view, elements, translations));
    }
  
    function applyTranslations(view, elems, translations) {
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      disconnect(view, null, true);
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      for (let i = 0; i < elems.length; i++) {
        overlayElement(elems[i], translations[i]);
      }
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      reconnect(view);
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    }
  
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    // Polyfill NodeList.prototype[Symbol.iterator] for Chrome.
    // See https://code.google.com/p/chromium/issues/detail?id=401699
    if (typeof NodeList === 'function' && !NodeList.prototype[Symbol.iterator]) {
      NodeList.prototype[Symbol.iterator] = Array.prototype[Symbol.iterator];
    }
  
    // A document.ready shim
    // https://github.com/whatwg/html/issues/127
    function documentReady() {
      if (document.readyState !== 'loading') {
        return Promise.resolve();
      }
  
      return new Promise(resolve => {
        document.addEventListener('readystatechange', function onrsc() {
          document.removeEventListener('readystatechange', onrsc);
          resolve();
        });
      });
    }
  
    // Intl.Locale
    function getDirection(code) {
      const tag = code.split('-')[0];
      return ['ar', 'he', 'fa', 'ps', 'ur'].indexOf(tag) >= 0 ?
        'rtl' : 'ltr';
    }
  
    // Opera and Safari don't support it yet
    if (navigator.languages === undefined) {
      navigator.languages = [navigator.language];
    }
  
    function getResourceLinks(head) {
      return Array.prototype.map.call(
        head.querySelectorAll('link[rel="localization"]'),
        el => el.getAttribute('href'));
    }
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    function getMeta(head) {
      let availableLangs = Object.create(null);
      let defaultLang = null;
      let appVersion = null;
  
      // XXX take last found instead of first?
      const metas = Array.from(head.querySelectorAll(
        'meta[name="availableLanguages"],' +
        'meta[name="defaultLanguage"],' +
        'meta[name="appVersion"]'));
      for (let meta of metas) {
        const name = meta.getAttribute('name');
        const content = meta.getAttribute('content').trim();
        switch (name) {
          case 'availableLanguages':
            availableLangs = getLangRevisionMap(
              availableLangs, content);
            break;
          case 'defaultLanguage':
            const [lang, rev] = getLangRevisionTuple(content);
            defaultLang = lang;
            if (!(lang in availableLangs)) {
              availableLangs[lang] = rev;
            }
            break;
          case 'appVersion':
            appVersion = content;
        }
      }
  
      return {
        defaultLang,
        availableLangs,
        appVersion
      };
    }
  
    function getLangRevisionMap(seq, str) {
      return str.split(',').reduce((seq, cur) => {
        const [lang, rev] = getLangRevisionTuple(cur);
        seq[lang] = rev;
        return seq;
      }, seq);
    }
  
    function getLangRevisionTuple(str) {
      const [lang, rev]  = str.trim().split(':');
      // if revision is missing, use NaN
      return [lang, parseInt(rev)];
    }
  
    const viewProps = new WeakMap();
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    class View {
      constructor(client, doc) {
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        this.pseudo = {
          'fr-x-psaccent': createPseudo(this, 'fr-x-psaccent'),
          'ar-x-psbidi': createPseudo(this, 'ar-x-psbidi')
        };
  
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        const initialized = documentReady().then(() => init(this, client));
        this._interactive = initialized.then(() => client);
        this.ready = initialized.then(langs => translateView(this, langs));
        initMutationObserver(this);
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        viewProps.set(this, {
          doc: doc,
          ready: false
        });
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        client.on('languageschangerequest',
          requestedLangs => this.requestLanguages(requestedLangs));
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      }
  
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      requestLanguages(requestedLangs, isGlobal) {
        const method = isGlobal ?
          client => client.method('requestLanguages', requestedLangs) :
          client => changeLanguages(this, client, requestedLangs);
        return this._interactive.then(method);
      }
  
      handleEvent() {
        return this.requestLanguages(navigator.languages);
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      }
  
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      formatEntities(...keys) {
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        return this._interactive.then(
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          client => client.method('formatEntities', client.id, keys));
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      }
  
      formatValue(id, args) {
        return this._interactive.then(
          client => client.method('formatValues', client.id, [[id, args]])).then(
          values => values[0]);
      }
  
      formatValues(...keys) {
        return this._interactive.then(
          client => client.method('formatValues', client.id, keys));
      }
  
      translateFragment(frag) {
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        return translateFragment(this, frag);
      }
  
      observeRoot(root) {
        observe(this, root);
      }
  
      disconnectRoot(root) {
        disconnect(this, root);
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      }
    }
  
    View.prototype.setAttributes = setAttributes;
    View.prototype.getAttributes = getAttributes;
  
    function createPseudo(view, code) {
      return {
        getName: () => view._interactive.then(
          client => client.method('getName', code)),
        processString: str => view._interactive.then(
          client => client.method('processString', code, str)),
      };
    }
  
    function init(view, client) {
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      const doc = viewProps.get(view).doc;
      const resources = getResourceLinks(doc.head);
      const meta = getMeta(doc.head);
      view.observeRoot(doc.documentElement);
      return getAdditionalLanguages().then(
        additionalLangs => client.method(
          'registerView', client.id, resources, meta, additionalLangs,
          navigator.languages));
    }
  
    function changeLanguages(view, client, requestedLangs) {
      const doc = viewProps.get(view).doc;
      const meta = getMeta(doc.head);
      return getAdditionalLanguages()
        .then(additionalLangs => client.method(
          'changeLanguages', client.id, meta, additionalLangs, requestedLangs
        ))
        .then(({langs, haveChanged}) => haveChanged ?
          translateView(view, langs) : undefined
        );
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    }
  
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    function getAdditionalLanguages() {
      if (navigator.mozApps && navigator.mozApps.getAdditionalLanguages) {
        return navigator.mozApps.getAdditionalLanguages()
          .catch(() => Object.create(null));
      }
  
      return Promise.resolve(Object.create(null));
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    }
  
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    function translateView(view, langs) {
      const props = viewProps.get(view);
      const html = props.doc.documentElement;
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      if (props.ready) {
        return translateRoots(view).then(
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          () => setAllAndEmit(html, langs));
      }
  
      const translated =
        // has the document been already pre-translated?
        langs[0].code === html.getAttribute('lang') ?
          Promise.resolve() :
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          translateRoots(view).then(
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            () => setLangDir(html, langs));
  
      return translated.then(() => {
        setLangs(html, langs);
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        props.ready = true;
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      });
    }
  
    function setLangs(html, langs) {
      const codes = langs.map(lang => lang.code);
      html.setAttribute('langs', codes.join(' '));
    }
  
    function setLangDir(html, langs) {
      const code = langs[0].code;
      html.setAttribute('lang', code);
      html.setAttribute('dir', getDirection(code));
    }
  
    function setAllAndEmit(html, langs) {
      setLangDir(html, langs);
      setLangs(html, langs);
      html.parentNode.dispatchEvent(new CustomEvent('DOMRetranslated', {
        bubbles: false,
        cancelable: false,
      }));
    }
  
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    const remote = new Remote(fetchResource, broadcast);
    const client = new Client(remote);
    document.l10n = new View(client, document);
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    window.addEventListener('languagechange', document.l10n);
    document.addEventListener('additionallanguageschange', document.l10n);
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  })();