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MapSetPolyfill.js
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MapSetPolyfill.js
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// based on es6-collections by Andrea Giammarchi, @WebReflection
// Object.is shim from the MDN
(function (global) {
'use strict';
if (!Object.is) {
Object.is = function(v1, v2) {
if (v1 === 0 && v2 === 0) {
return 1 / v1 === 1 / v2;
}
if (v1 !== v1) {
return v2 !== v2;
}
return v1 === v2;
};
}
//shared pointer
var i;
//shortcuts
var defineProperty = Object.defineProperty, is = Object.is;
if (!global.Set) {
global.Map = createCollection({
// WeakMap#delete(key:void*):boolean
'delete': sharedDelete,
//:was Map#get(key:void*[, d3fault:void*]):void*
// Map#has(key:void*):boolean
has: mapHas,
// Map#get(key:void*):boolean
get: sharedGet,
// Map#set(key:void*, value:void*):void
set: sharedSet,
// Map#keys(void):Array === not in specs
keys: sharedKeys,
// Map#values(void):Array === not in specs
values: sharedValues,
// Map#forEach(callback:Function, context:void*):void ==> callback.call(context, key, value, mapObject) === not in specs`
forEach: sharedForEach,
// Map#clear():
clear: sharedClear
});
global.Set = createCollection({
// Set#has(value:void*):boolean
has: setHas,
// Set#add(value:void*):boolean
add: sharedAdd,
// Set#delete(key:void*):boolean
'delete': sharedDelete,
// Set#clear():
clear: sharedClear,
// Set#values(void):Array === not in specs
values: sharedValues,
// Set#forEach(callback:Function, context:void*):void ==> callback.call(context, value, index) === not in specs
forEach: sharedSetIterate
});
}
/**
* ES6 collection constructor
* @return {Function} a collection class
*/
function createCollection(proto, objectOnly){
function Collection(a){
if (!this || this.constructor !== Collection) return new Collection(a);
this._keys = [];
this._values = [];
this.objectOnly = objectOnly;
//parse initial iterable argument passed
if (a) init.call(this, a);
}
//define size for non object-only collections
if (!objectOnly) {
defineProperty(proto, 'size', {
get: sharedSize
});
}
//set prototype
proto.constructor = Collection;
Collection.prototype = proto;
return Collection;
}
/** parse initial iterable argument passed */
function init(a){
//init Set argument, like `[1,2,3,{}]`
if (this.add)
a.forEach(this.add, this);
//init Map argument like `[[1,2], [{}, 4]]`
else
a.forEach(function(a){this.set(a[0],a[1])}, this);
}
/** delete */
function sharedDelete(key) {
if (this.has(key)) {
this._keys.splice(i, 1);
this._values.splice(i, 1);
}
// Aurora here does it while Canary doesn't
return -1 < i;
}
function sharedGet(key) {
return this.has(key) ? this._values[i] : undefined;
}
function has(list, key) {
if (this.objectOnly && key !== Object(key))
throw new TypeError("Invalid value used as weak collection key");
//NaN or 0 passed
if (key != key || key === 0) for (i = list.length; i-- && !is(list[i], key););
else i = list.indexOf(key);
return -1 < i;
}
function setHas(value) {
return has.call(this, this._values, value);
}
function mapHas(value) {
return has.call(this, this._keys, value);
}
/** @chainable */
function sharedSet(key, value) {
this.has(key) ?
this._values[i] = value
:
this._values[this._keys.push(key) - 1] = value
;
return this;
}
/** @chainable */
function sharedAdd(value) {
if (!this.has(value)) this._values.push(value);
return this;
}
function sharedClear() {
this._values.length = 0;
}
/** keys, values, and iterate related methods */
function sharedValues() {
return this._values.slice();
}
function sharedKeys() {
return this._keys.slice();
}
function sharedSize() {
return this._values.length;
}
function sharedForEach(callback, context) {
var self = this;
var values = self._values.slice();
self._keys.slice().forEach(function (key, n) {
callback.call(context, values[n], key, self);
});
}
function sharedSetIterate(callback, context) {
var self = this;
self._values.slice().forEach(function (value) {
callback.call(context, value, value, self);
});
}
})(typeof(window) !== 'undefined' && window || this);