diff options
Diffstat (limited to 'node_modules/core-js/library/modules/$.collection-weak.js')
| -rw-r--r-- | node_modules/core-js/library/modules/$.collection-weak.js | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/node_modules/core-js/library/modules/$.collection-weak.js b/node_modules/core-js/library/modules/$.collection-weak.js new file mode 100644 index 000000000..384fb39dc --- /dev/null +++ b/node_modules/core-js/library/modules/$.collection-weak.js @@ -0,0 +1,86 @@ +'use strict'; +var hide = require('./$.hide') + , redefineAll = require('./$.redefine-all') + , anObject = require('./$.an-object') + , isObject = require('./$.is-object') + , strictNew = require('./$.strict-new') + , forOf = require('./$.for-of') + , createArrayMethod = require('./$.array-methods') + , $has = require('./$.has') + , WEAK = require('./$.uid')('weak') + , isExtensible = Object.isExtensible || isObject + , arrayFind = createArrayMethod(5) + , arrayFindIndex = createArrayMethod(6) + , id = 0; + +// fallback for frozen keys +var frozenStore = function(that){ + return that._l || (that._l = new FrozenStore); +}; +var FrozenStore = function(){ + this.a = []; +}; +var findFrozen = function(store, key){ + return arrayFind(store.a, function(it){ + return it[0] === key; + }); +}; +FrozenStore.prototype = { + get: function(key){ + var entry = findFrozen(this, key); + if(entry)return entry[1]; + }, + has: function(key){ + return !!findFrozen(this, key); + }, + set: function(key, value){ + var entry = findFrozen(this, key); + if(entry)entry[1] = value; + else this.a.push([key, value]); + }, + 'delete': function(key){ + var index = arrayFindIndex(this.a, function(it){ + return it[0] === key; + }); + if(~index)this.a.splice(index, 1); + return !!~index; + } +}; + +module.exports = { + getConstructor: function(wrapper, NAME, IS_MAP, ADDER){ + var C = wrapper(function(that, iterable){ + strictNew(that, C, NAME); + that._i = id++; // collection id + that._l = undefined; // leak store for frozen objects + if(iterable != undefined)forOf(iterable, IS_MAP, that[ADDER], that); + }); + redefineAll(C.prototype, { + // 23.3.3.2 WeakMap.prototype.delete(key) + // 23.4.3.3 WeakSet.prototype.delete(value) + 'delete': function(key){ + if(!isObject(key))return false; + if(!isExtensible(key))return frozenStore(this)['delete'](key); + return $has(key, WEAK) && $has(key[WEAK], this._i) && delete key[WEAK][this._i]; + }, + // 23.3.3.4 WeakMap.prototype.has(key) + // 23.4.3.4 WeakSet.prototype.has(value) + has: function has(key){ + if(!isObject(key))return false; + if(!isExtensible(key))return frozenStore(this).has(key); + return $has(key, WEAK) && $has(key[WEAK], this._i); + } + }); + return C; + }, + def: function(that, key, value){ + if(!isExtensible(anObject(key))){ + frozenStore(that).set(key, value); + } else { + $has(key, WEAK) || hide(key, WEAK, {}); + key[WEAK][that._i] = value; + } return that; + }, + frozenStore: frozenStore, + WEAK: WEAK +};
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