WebCompDev / COMPONENTS

  (function () { 'use strict';
  
    const Service = bridge.service;
    const channel = new BroadcastChannel('l20n-channel');
  
    function broadcast(type, data) {
      return this.service.broadcast(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);
        }
      },
    };
  

    function fetchResource(res, { code, src, ver }) {
      const url = res.replace('{locale}', code);

      const type = res.endsWith('.json') ? 'json' : 'text';

      return io[src](code, ver, url, type);

    }
  

    const KNOWN_MACROS = ['plural'];
    const MAX_PLACEABLE_LENGTH = 2500;

    // Unicode bidi isolation characters
    const FSI = '\u2068';
    const PDI = '\u2069';

    const resolutionChain = new WeakSet();

    function format(ctx, lang, args, entity) {
      if (typeof entity === 'string') {
        return [{}, entity];
      }

      if (resolutionChain.has(entity)) {
        throw new L10nError('Cyclic reference detected');
      }

      resolutionChain.add(entity);

      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;
    }

    function resolveIdentifier(ctx, lang, args, id) {
      if (KNOWN_MACROS.indexOf(id) > -1) {
        return [{}, ctx._getMacro(lang, id)];
      }

      if (args && args.hasOwnProperty(id)) {
        if (typeof args[id] === 'string' || (typeof args[id] === 'number' &&
            !isNaN(args[id]))) {
          return [{}, args[id]];

        } else {

          throw new L10nError('Arg must be a string or a number: ' + id);

        }

      }

      // XXX: special case for Node.js where still:
      // '__proto__' in Object.create(null) => true
      if (id === '__proto__') {
        throw new L10nError('Illegal id: ' + id);
      }

      const entity = ctx._getEntity(lang, id);

      if (entity) {
        return format(ctx, lang, args, entity);
      }

      throw new L10nError('Unknown reference: ' + id);
    }

    function subPlaceable(locals, ctx, lang, args, id) {
      let newLocals, value;

      try {
        [newLocals, value] = resolveIdentifier(ctx, lang, args, id);
      } catch (err) {
        return [{ error: err }, FSI + '{{ ' + id + ' }}' + PDI];
      }

      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 + ')');

        }

        return [newLocals, FSI + value + PDI];
      }

      return [{}, FSI + '{{ ' + id + ' }}' + PDI];
    }

    function interpolate(locals, ctx, lang, args, arr) {
      return arr.reduce(function([localsSeq, valueSeq], cur) {
        if (typeof cur === 'string') {
          return [localsSeq, valueSeq + cur];

        } else {

          const [, value] = subPlaceable(locals, ctx, lang, args, cur.name);
          // wrap the substitution in bidi isolate characters
          return [localsSeq, valueSeq + value];

        }

      }, [locals, '']);
    }

    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];

      if (typeof selector !== 'function') {
        // selector is a simple reference to an entity or args
        return selector;
      }

      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';

        }

        if (argValue === 1 && 'one' in expr) {
          return 'one';
        }
        if (argValue === 2 && 'two' in expr) {
          return 'two';
        }
      }

      return selector(argValue);
    }

    function resolveValue(locals, ctx, lang, args, expr, index) {
      if (!expr) {
        return [locals, expr];
      }

      if (typeof expr === 'string' ||
          typeof expr === 'boolean' ||
          typeof expr === 'number') {
        return [locals, expr];
      }

      if (Array.isArray(expr)) {
        return interpolate(locals, ctx, lang, args, expr);
      }

      // 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]);
        }
      }

      // 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]);
      }

      throw new L10nError('Unresolvable value');
    }

    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
    };
  
    // 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;
    }
  
    // list of all plural rules methods:
    // map an integer to the plural form name to use
    const pluralRules = {
      '0': function() {
        return 'other';
      },
      '1': function(n) {
        if ((isBetween((n % 100), 3, 10))) {
          return 'few';
        }
        if (n === 0) {
          return 'zero';

        }

        if ((isBetween((n % 100), 11, 99))) {
          return 'many';

        }

        if (n === 2) {
          return 'two';

        }

        if (n === 1) {
          return 'one';

        }

        return 'other';

      },

      '2': function(n) {
        if (n !== 0 && (n % 10) === 0) {
          return 'many';

        }

        if (n === 2) {
          return 'two';

        }

        if (n === 1) {
          return 'one';

        }

        return 'other';
      },
      '3': function(n) {
        if (n === 1) {
          return 'one';

        }

        return 'other';

      },

      '4': function(n) {
        if ((isBetween(n, 0, 1))) {
          return 'one';

        }

        return 'other';
      },
      '5': function(n) {
        if ((isBetween(n, 0, 2)) && n !== 2) {
          return 'one';

        }

        return 'other';

      },

      '6': function(n) {
        if (n === 0) {
          return 'zero';

        }

        if ((n % 10) === 1 && (n % 100) !== 11) {
          return 'one';

        }

        return 'other';

      },

      '7': function(n) {
        if (n === 2) {
          return 'two';

        }

        if (n === 1) {
          return 'one';
        }
        return 'other';

      },

      '8': function(n) {
        if ((isBetween(n, 3, 6))) {
          return 'few';

        }

        if ((isBetween(n, 7, 10))) {
          return 'many';
        }
        if (n === 2) {
          return 'two';
        }
        if (n === 1) {
          return 'one';
        }
        return 'other';

      },

      '9': function(n) {
        if (n === 0 || n !== 1 && (isBetween((n % 100), 1, 19))) {
          return 'few';

        }

        if (n === 1) {
          return 'one';
        }
        return 'other';

      },

      '10': function(n) {
        if ((isBetween((n % 10), 2, 9)) && !(isBetween((n % 100), 11, 19))) {
          return 'few';
        }
        if ((n % 10) === 1 && !(isBetween((n % 100), 11, 19))) {
          return 'one';
        }
        return 'other';

      },

      '11': function(n) {
        if ((isBetween((n % 10), 2, 4)) && !(isBetween((n % 100), 12, 14))) {
          return 'few';
        }
        if ((n % 10) === 0 ||
            (isBetween((n % 10), 5, 9)) ||
            (isBetween((n % 100), 11, 14))) {
          return 'many';
        }
        if ((n % 10) === 1 && (n % 100) !== 11) {
          return 'one';

        }

        return 'other';

      },

      '12': function(n) {
        if ((isBetween(n, 2, 4))) {
          return 'few';

        }

        if (n === 1) {
          return 'one';

        }

        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';

        }

        if ((n % 100) === 2) {
          return 'two';
        }
        if ((n % 100) === 1) {
          return 'one';
        }
        return 'other';

      },

      '15': function(n) {
        if (n === 0 || (isBetween((n % 100), 2, 10))) {
          return 'few';
        }
        if ((isBetween((n % 100), 11, 19))) {
          return 'many';
        }
        if (n === 1) {
          return 'one';
        }
        return 'other';

      },

      '16': function(n) {
        if ((n % 10) === 1 && n !== 11) {
          return 'one';

        }

        return 'other';
      },
      '17': function(n) {
        if (n === 3) {
          return 'few';

        }

        if (n === 0) {
          return 'zero';

        }

        if (n === 6) {
          return 'many';
        }
        if (n === 2) {
          return 'two';
        }
        if (n === 1) {
          return 'one';
        }
        return 'other';

      },

      '18': function(n) {
        if (n === 0) {
          return 'zero';

        }

        if ((isBetween(n, 0, 2)) && n !== 0 && n !== 2) {
          return 'one';

        }

        return 'other';
      },
      '19': function(n) {
        if ((isBetween(n, 2, 10))) {
          return 'few';

        }

        if ((isBetween(n, 0, 1))) {
          return 'one';
        }
        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) {
          return 'zero';

        }

        if (n === 1) {
          return 'one';

        }

        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])) {
          return 'two';

        }

        if (isIn(n, [1, 11])) {
          return 'one';
        }
        return 'other';

      }

    };

    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'; };

      }

      return pluralRules[index];

    }
  

    // Safari 9 and iOS 9 does not support Intl
    const L20nIntl = typeof Intl !== 'undefined' ?
      Intl : {
      NumberFormat: function() {
        return {
          format: function(v) {
            return v;
          }
        };

      }

    };

    class Context {
      constructor(env, langs, resIds) {
        this.langs = langs;
        this.resIds = resIds;
        this.env = env;
        this.emit = (type, evt) => env.emit(type, evt, this);

      }
  

      _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];

        }

      }
  

      _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;
          }
        }

        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);

        }

        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);
        }

        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;

        }

  
        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];
          }

        }

        return undefined;
      }
  
      _getNumberFormatter(lang) {
        if (!this.env.numberFormatters) {
          this.env.numberFormatters = new Map();

        }

        if (!this.env.numberFormatters.has(lang)) {
          const formatter = L20nIntl.NumberFormat(lang);
          this.env.numberFormatters.set(lang, formatter);
          return formatter;

        }

        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;