review.tizen.org Git - platform/framework/web/crosswalk-tizen.git/blob

   1 'use strict';
   2
   3 var setPrototypeOf    = require('es5-ext/object/set-prototype-of')
   4   , object            = require('es5-ext/object/valid-object')
   5   , value             = require('es5-ext/object/valid-value')
   6   , d                 = require('d')
   7   , getIterator       = require('es6-iterator/get')
   8   , forOf             = require('es6-iterator/for-of')
   9   , toStringTagSymbol = require('es6-symbol').toStringTag
  10   , isNative          = require('./is-native-implemented')
  11
  12   , isArray = Array.isArray, defineProperty = Object.defineProperty, random = Math.random
  13   , hasOwnProperty = Object.prototype.hasOwnProperty
  14   , genId, WeakMapPoly;
  15
  16 genId = (function () {
  17         var generated = Object.create(null);
  18         return function () {
  19                 var id;
  20                 do { id = random().toString(36).slice(2); } while (generated[id]);
  21                 generated[id] = true;
  22                 return id;
  23         };
  24 }());
  25
  26 module.exports = WeakMapPoly = function (/*iterable*/) {
  27         var iterable = arguments[0];
  28         if (!(this instanceof WeakMapPoly)) return new WeakMapPoly(iterable);
  29         if (this.__weakMapData__ !== undefined) {
  30                 throw new TypeError(this + " cannot be reinitialized");
  31         }
  32         if (iterable != null) {
  33                 if (!isArray(iterable)) iterable = getIterator(iterable);
  34         }
  35         defineProperty(this, '__weakMapData__', d('c', '$weakMap$' + genId()));
  36         if (!iterable) return;
  37         forOf(iterable, function (val) {
  38                 value(val);
  39                 this.set(val[0], val[1]);
  40         }, this);
  41 };
  42
  43 if (isNative) {
  44         if (setPrototypeOf) setPrototypeOf(WeakMapPoly, WeakMap);
  45         WeakMapPoly.prototype = Object.create(WeakMap.prototype, {
  46                 constructor: d(WeakMapPoly)
  47         });
  48 }
  49
  50 Object.defineProperties(WeakMapPoly.prototype, {
  51         clear: d(function () {
  52                 defineProperty(this, '__weakMapData__', d('c', '$weakMap$' + genId()));
  53         }),
  54         delete: d(function (key) {
  55                 if (hasOwnProperty.call(object(key), this.__weakMapData__)) {
  56                         delete key[this.__weakMapData__];
  57                         return true;
  58                 }
  59                 return false;
  60         }),
  61         get: d(function (key) {
  62                 if (hasOwnProperty.call(object(key), this.__weakMapData__)) {
  63                         return key[this.__weakMapData__];
  64                 }
  65         }),
  66         has: d(function (key) {
  67                 return hasOwnProperty.call(object(key), this.__weakMapData__);
  68         }),
  69         set: d(function (key, value) {
  70                 defineProperty(object(key), this.__weakMapData__, d('c', value));
  71                 return this;
  72         }),
  73         toString: d(function () { return '[object WeakMap]'; })
  74 });
  75 defineProperty(WeakMapPoly.prototype, toStringTagSymbol, d('c', 'WeakMap'));