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Diffstat (limited to 'node_modules/es6-weak-map/polyfill.js')
-rw-r--r-- | node_modules/es6-weak-map/polyfill.js | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/node_modules/es6-weak-map/polyfill.js b/node_modules/es6-weak-map/polyfill.js new file mode 100644 index 000000000..6bef09f5b --- /dev/null +++ b/node_modules/es6-weak-map/polyfill.js @@ -0,0 +1,66 @@ +'use strict'; + +var setPrototypeOf = require('es5-ext/object/set-prototype-of') + , object = require('es5-ext/object/valid-object') + , value = require('es5-ext/object/valid-value') + , randomUniq = require('es5-ext/string/random-uniq') + , d = require('d') + , getIterator = require('es6-iterator/get') + , forOf = require('es6-iterator/for-of') + , toStringTagSymbol = require('es6-symbol').toStringTag + , isNative = require('./is-native-implemented') + + , isArray = Array.isArray, defineProperty = Object.defineProperty + , hasOwnProperty = Object.prototype.hasOwnProperty, getPrototypeOf = Object.getPrototypeOf + , WeakMapPoly; + +module.exports = WeakMapPoly = function (/*iterable*/) { + var iterable = arguments[0], self; + if (!(this instanceof WeakMapPoly)) throw new TypeError('Constructor requires \'new\''); + if (isNative && setPrototypeOf && (WeakMap !== WeakMapPoly)) { + self = setPrototypeOf(new WeakMap(), getPrototypeOf(this)); + } else { + self = this; + } + if (iterable != null) { + if (!isArray(iterable)) iterable = getIterator(iterable); + } + defineProperty(self, '__weakMapData__', d('c', '$weakMap$' + randomUniq())); + if (!iterable) return self; + forOf(iterable, function (val) { + value(val); + self.set(val[0], val[1]); + }); + return self; +}; + +if (isNative) { + if (setPrototypeOf) setPrototypeOf(WeakMapPoly, WeakMap); + WeakMapPoly.prototype = Object.create(WeakMap.prototype, { + constructor: d(WeakMapPoly) + }); +} + +Object.defineProperties(WeakMapPoly.prototype, { + delete: d(function (key) { + if (hasOwnProperty.call(object(key), this.__weakMapData__)) { + delete key[this.__weakMapData__]; + return true; + } + return false; + }), + get: d(function (key) { + if (hasOwnProperty.call(object(key), this.__weakMapData__)) { + return key[this.__weakMapData__]; + } + }), + has: d(function (key) { + return hasOwnProperty.call(object(key), this.__weakMapData__); + }), + set: d(function (key, value) { + defineProperty(object(key), this.__weakMapData__, d('c', value)); + return this; + }), + toString: d(function () { return '[object WeakMap]'; }) +}); +defineProperty(WeakMapPoly.prototype, toStringTagSymbol, d('c', 'WeakMap')); |