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83 lines
2.3 KiB
JavaScript
83 lines
2.3 KiB
JavaScript
# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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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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this.BindToObject = 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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