$.collection-weak.js
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'use strict';
var hide = require('./$.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
};