(function () { 'use strict';

  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;

  const MAX_PLACEABLES = 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();
    },

    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();
        }
      }

      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);
      }

      if (this._source.startsWith('/*', this._index)) {
        return this.getComment();
      }

      throw this.error('Invalid entry');
    },

    getEntity: function(id, index) {
      if (!this.getRequiredWS()) {
        throw this.error('Expected white space');
      }

      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();
        }
      }

      // 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
        };
      }
    },

    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);
      }

      if (required) {
        throw this.error('Unknown value type');
      }

      return;
    },

    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);
      }
    },

    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);
      }
      return this._index !== pos;
    },

    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_]');
      }

      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);
      }

      return this._source.slice(start, this._index);
    },

    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');
      }
      this._index++;
      return String.fromCharCode(
        parseInt(this._source.slice(this._index - 4, this._index), 16));
    },

    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) {
            throw this.error('Too many placeables, maximum allowed is ' +
                MAX_PLACEABLES);
          }
          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;
        }
      }

      if (body.length === 0) {
        return buf + this._source.slice(bufStart, this._index - opcharLen);
      }

      if (this._index - opcharLen > bufStart || buf.length > 0) {
        body.push(buf + this._source.slice(bufStart, this._index - opcharLen));
      }

      return body;
    },

    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 ">"');
        }
      }
      return attrs;
    },

    getAttribute: function(attrs) {
      const key = this.getIdentifier();
      let index;

      if (this._source[this._index]=== '[') {
        ++this._index;
        this.getWS();
        index = this.getItemList(this.getExpression, ']');
      }
      this.getWS();
      if (this._source[this._index] !== ':') {
        throw this.error('Expected ":"');
      }
      ++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');
      }

      if (!index && typeof value === 'string') {
        attrs[key] = value;
      } else {
        attrs[key] = {
          value,
          index
        };
      }
    },

    getHash: function(index) {
      const items = Object.create(null);

      ++this._index;
      this.getWS();

      let defKey;

      while (true) {
        const [key, value, def] = this.getHashItem();
        items[key] = value;

        if (def) {
          if (defKey) {
            throw this.error('Default item redefinition forbidden');
          }
          defKey = key;
        }
        this.getWS();

        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 "}"');
        }
      }

      if (defKey) {
        items.__default = defKey;
      } else if (!index) {
        throw this.error('Unresolvable Hash Value');
      }

      return items;
    },

    getHashItem: function() {
      let defItem = false;
      if (this._source[this._index] === '*') {
        ++this._index;
        defItem = true;
      }

      const key = this.getIdentifier();
      this.getWS();
      if (this._source[this._index] !== ':') {
        throw this.error('Expected ":"');
      }
      ++this._index;
      this.getWS();

      return [key, this.getValue(), defItem];
    },

    getComment: function() {
      this._index += 2;
      const start = this._index;
      const end = this._source.indexOf('*/', start);

      if (end === -1) {
        throw this.error('Comment without a closing tag');
      }

      this._index = end + 2;
    },

    getExpression: function () {
      let exp = this.getPrimaryExpression();

      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;
        }
      }

      return exp;
    },

    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();
      }

      return {
        type: 'prop',
        expr: idref,
        prop: exp,
        cmpt: computed
      };
    },

    getCallExpression: function(callee) {
      this.getWS();

      return {
        type: 'call',
        expr: callee,
        args: this.getItemList(this.getExpression, ')')
      };
    },

    getPrimaryExpression: function() {
      const ch = this._source[this._index];

      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()
          };
      }
    },

    getItemList: function(callback, closeChar) {
      const items = [];
      let closed = false;

      this.getWS();

      if (this._source[this._index] === closeChar) {
        ++this._index;
        closed = true;
      }

      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 + '"');
        }
      }

      return items;
    },


    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;
      }

      let nextEntry = Math.min(nextEntity, nextComment);

      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;
    },
  };

  var MAX_PLACEABLES$1 = 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*\}\}/,
      };
    },

    parse: function(emit, source) {
      if (!this.patterns) {
        this.init();
      }
      this.emit = emit;

      var entries = {};

      var lines = source.match(this.patterns.entries);
      if (!lines) {
        return entries;
      }
      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;
            }
          }
        }
      }
      return entries;
    },

    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;
      }

      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;
      }

      this.setEntityValue(name, attr, key, this.unescapeString(value), entries);
    },

    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;
      }

      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;
      }

      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;
      }

      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;
      }
    },

    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$1) {
        throw this.error('Too many placeables (' + placeablesCount +
                            ', max allowed is ' + MAX_PLACEABLES$1 + ')');
      }

      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]);
        }
      }
      return complexStr;
    },

    unescapeString: function(str) {
      if (str.lastIndexOf('\\') !== -1) {
        str = str.replace(this.patterns.controlChars, '$1');
      }
      return str.replace(this.patterns.unicode, function(match, token) {
        return String.fromCodePoint(parseInt(token, 16));
      });
    },

    parseIndex: function(str) {
      var match = str.match(this.patterns.index);
      if (!match) {
        throw new L10nError('Malformed index');
      }
      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]}];
      }
    },

    error: function(msg, type = 'parsererror') {
      const err = new L10nError(msg);
      if (this.emit) {
        this.emit(type, err);
      }
      return err;
    }
  };

  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];
  }

  function MockContext(entries) {
    this._getNumberFormatter = function() {
      return {
        format: function(value) {
          return value;
        }
      };
    };
    this._getEntity = function(lang, id) {
      return entries[id];
    };

    this._getMacro = function(lang, id) {
      switch(id) {
        case 'plural':
          return getPluralRule(lang.code);
        default:
          return undefined;
      }
    };
  }

  this.L20n = {
    MockContext,
    L20nParser,
    PropertiesParser,
    format
  };

})();