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115 lines
3.8 KiB
JavaScript
115 lines
3.8 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 Google Safe Browsing.
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#
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# The Initial Developer of the Original Code is Google Inc.
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# Portions created by the Initial Developer are Copyright (C) 2006
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# the Initial Developer. All Rights Reserved.
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#
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# Contributor(s):
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# Aaron Boodman <aa@google.com> (original author)
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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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/**
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* lang.js - Some missing JavaScript language features
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*/
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/**
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* Partially applies a function to a particular "this object" and zero or
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* more arguments. The result is a new function with some arguments of the first
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* function pre-filled and the value of |this| "pre-specified".
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*
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* Remaining arguments specified at call-time are appended to the pre-
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* specified ones.
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*
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* Usage:
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* var barMethBound = BindToObject(myFunction, myObj, "arg1", "arg2");
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* barMethBound("arg3", "arg4");
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*
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* @param fn {string} Reference to the function to be bound
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*
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* @param self {object} Specifies the object which |this| should point to
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* when the function is run. If the value is null or undefined, it will default
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* to the global object.
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*
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* @returns {function} A partially-applied form of the speficied function.
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*/
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function BindToObject(fn, self, opt_args) {
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var boundargs = fn.boundArgs_ || [];
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boundargs = boundargs.concat(Array.slice(arguments, 2, arguments.length));
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if (fn.boundSelf_)
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self = fn.boundSelf_;
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if (fn.boundFn_)
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fn = fn.boundFn_;
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var newfn = function() {
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// Combine the static args and the new args into one big array
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var args = boundargs.concat(Array.slice(arguments));
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return fn.apply(self, args);
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}
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newfn.boundArgs_ = boundargs;
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newfn.boundSelf_ = self;
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newfn.boundFn_ = fn;
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return newfn;
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}
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/**
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* Inherit the prototype methods from one constructor into another.
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*
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* Usage:
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*
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* function ParentClass(a, b) { }
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* ParentClass.prototype.foo = function(a) { }
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*
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* function ChildClass(a, b, c) {
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* ParentClass.call(this, a, b);
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* }
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*
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* ChildClass.inherits(ParentClass);
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*
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* var child = new ChildClass("a", "b", "see");
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* child.foo(); // works
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*
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* In addition, a superclass' implementation of a method can be invoked
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* as follows:
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*
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* ChildClass.prototype.foo = function(a) {
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* ChildClass.superClass_.foo.call(this, a);
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* // other code
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* };
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*/
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Function.prototype.inherits = function(parentCtor) {
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var tempCtor = function(){};
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tempCtor.prototype = parentCtor.prototype;
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this.superClass_ = parentCtor.prototype;
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this.prototype = new tempCtor();
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}
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