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Extract class runtime functions into own file
See google#1007
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| // Copyright 2014 Traceur Authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| (function() { | ||
| 'use strict'; | ||
|
|
||
| var $Object = Object; | ||
| var $TypeError = TypeError; | ||
| var $create = $Object.create; | ||
| var $defineProperties = $traceurRuntime.defineProperties; | ||
| var $defineProperty = $traceurRuntime.defineProperty; | ||
| var $getOwnPropertyDescriptor = $traceurRuntime.getOwnPropertyDescriptor; | ||
| var $getOwnPropertyNames = $traceurRuntime.getOwnPropertyNames; | ||
| var $getPrototypeOf = Object.getPrototypeOf; | ||
|
|
||
| function superDescriptor(homeObject, name) { | ||
| var proto = $getPrototypeOf(homeObject); | ||
| do { | ||
| var result = $getOwnPropertyDescriptor(proto, name); | ||
| if (result) | ||
| return result; | ||
| proto = $getPrototypeOf(proto); | ||
| } while (proto) | ||
|
|
||
| return undefined; | ||
| } | ||
|
|
||
| function superCall(self, homeObject, name, args) { | ||
| return superGet(self, homeObject, name).apply(self, args); | ||
| } | ||
|
|
||
| function superGet(self, homeObject, name) { | ||
| var descriptor = superDescriptor(homeObject, name); | ||
| if (descriptor) { | ||
| if (!descriptor.get) | ||
| return descriptor.value; | ||
| return descriptor.get.call(self); | ||
| } | ||
| return undefined; | ||
| } | ||
|
|
||
| function superSet(self, homeObject, name, value) { | ||
| var descriptor = superDescriptor(homeObject, name); | ||
| if (descriptor && descriptor.set) { | ||
| descriptor.set.call(self, value); | ||
| return value; | ||
| } | ||
| throw $TypeError("super has no setter '" + name + "'."); | ||
| } | ||
|
|
||
| function getDescriptors(object) { | ||
| var descriptors = {}, name, names = $getOwnPropertyNames(object); | ||
| for (var i = 0; i < names.length; i++) { | ||
| var name = names[i]; | ||
| descriptors[name] = $getOwnPropertyDescriptor(object, name); | ||
| } | ||
| return descriptors; | ||
| } | ||
|
|
||
| // The next three functions are more or less identical to | ||
| // ClassDefinitionEvaluation in the ES6 draft. | ||
|
|
||
| function createClass(ctor, object, staticObject, superClass) { | ||
| $defineProperty(object, 'constructor', { | ||
| value: ctor, | ||
| configurable: true, | ||
| enumerable: false, | ||
| writable: true | ||
| }); | ||
|
|
||
| if (arguments.length > 3) { | ||
| if (typeof superClass === 'function') | ||
| ctor.__proto__ = superClass; | ||
| ctor.prototype = $create(getProtoParent(superClass), | ||
| getDescriptors(object)); | ||
| } else { | ||
| ctor.prototype = object; | ||
| } | ||
| $defineProperty(ctor, 'prototype', {configurable: false, writable: false}); | ||
| return $defineProperties(ctor, getDescriptors(staticObject)); | ||
| } | ||
|
|
||
| function getProtoParent(superClass) { | ||
| if (typeof superClass === 'function') { | ||
| var prototype = superClass.prototype; | ||
| if ($Object(prototype) === prototype || prototype === null) | ||
| return superClass.prototype; | ||
| } | ||
| if (superClass === null) | ||
| return null; | ||
| throw new $TypeError(); | ||
| } | ||
|
|
||
| function defaultSuperCall(self, homeObject, args) { | ||
| if ($getPrototypeOf(homeObject) !== null) | ||
| superCall(self, homeObject, 'constructor', args); | ||
| } | ||
|
|
||
| $traceurRuntime.createClass = createClass; | ||
| $traceurRuntime.defaultSuperCall = defaultSuperCall; | ||
| $traceurRuntime.superCall = superCall; | ||
| $traceurRuntime.superGet = superGet; | ||
| $traceurRuntime.superSet = superSet; | ||
| })(); |
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