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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
/**
* lang.js - Some missing JavaScript language features
*/
/**
* Partially applies a function to a particular "this object" and zero or
* more arguments. The result is a new function with some arguments of the first
* function pre-filled and the value of |this| "pre-specified".
*
* Remaining arguments specified at call-time are appended to the pre-
* specified ones.
*
* Usage:
* var barMethBound = BindToObject(myFunction, myObj, "arg1", "arg2");
* barMethBound("arg3", "arg4");
*
* @param fn {string} Reference to the function to be bound
*
* @param self {object} Specifies the object which |this| should point to
* when the function is run. If the value is null or undefined, it will default
* to the global object.
*
* @returns {function} A partially-applied form of the speficied function.
*/
this.BindToObject = function BindToObject(fn, self, opt_args) {
var boundargs = fn.boundArgs_ || [];
boundargs = boundargs.concat(Array.slice(arguments, 2, arguments.length));
if (fn.boundSelf_)
self = fn.boundSelf_;
if (fn.boundFn_)
fn = fn.boundFn_;
var newfn = function() {
// Combine the static args and the new args into one big array
var args = boundargs.concat(Array.slice(arguments));
return fn.apply(self, args);
}
newfn.boundArgs_ = boundargs;
newfn.boundSelf_ = self;
newfn.boundFn_ = fn;
return newfn;
}
/**
* Inherit the prototype methods from one constructor into another.
*
* Usage:
*
* function ParentClass(a, b) { }
* ParentClass.prototype.foo = function(a) { }
*
* function ChildClass(a, b, c) {
* ParentClass.call(this, a, b);
* }
*
* ChildClass.inherits(ParentClass);
*
* var child = new ChildClass("a", "b", "see");
* child.foo(); // works
*
* In addition, a superclass' implementation of a method can be invoked
* as follows:
*
* ChildClass.prototype.foo = function(a) {
* ChildClass.superClass_.foo.call(this, a);
* // other code
* };
*/
Function.prototype.inherits = function(parentCtor) {
var tempCtor = function(){};
tempCtor.prototype = parentCtor.prototype;
this.superClass_ = parentCtor.prototype;
this.prototype = new tempCtor();
}
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