зеркало из https://github.com/mozilla/snowl.git
86 строки
3.1 KiB
JavaScript
86 строки
3.1 KiB
JavaScript
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Snowl.
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*
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* The Initial Developer of the Original Code is Mozilla.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Myk Melez <myk@mozilla.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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let EXPORTED_SYMBOLS = ["Mixins"];
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/**
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* Mix attributes (properties, methods, getters/setters) from the source object
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* into the target object.
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*
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* Note: doesn't mix in attributes that already exist in the target object
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* (i.e. doesn't override existing attributes).
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* ??? Should it?
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*
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* FIXME: give the target object access in some way to the source's version
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* of attributes it overrides.
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*
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* @param source {Object} the object that provides attributes
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* @param target {Object} the object that receives attributes
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*/
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function mixin(source, target) {
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for (let attribute in source) {
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// Don't mix in attributes that already exist in the target.
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if (attribute in target)
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continue;
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let getter = source.__lookupGetter__(attribute);
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let setter = source.__lookupSetter__(attribute);
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// We can have a getter, a setter, or both. If we have either, we only
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// define one or both of them. Otherwise, we assign the property directly.
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if (getter || setter) {
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if (getter)
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target.__defineGetter__(attribute, getter);
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if (setter)
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target.__defineSetter__(attribute, setter);
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}
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else
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target[attribute] = source[attribute];
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}
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}
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// FIXME: support both source and target arguments accepting arrays of objects.
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let Mixins = {
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mix: function(source) {
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return {
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source: source,
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into: function(target) {
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mixin(this.source, target);
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}
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};
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}
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};
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