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398 lines
13 KiB
JavaScript
398 lines
13 KiB
JavaScript
/*
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Copyright (c) 2004-2011, The Dojo Foundation All Rights Reserved.
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Available via Academic Free License >= 2.1 OR the modified BSD license.
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see: http://dojotoolkit.org/license for details
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*/
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if(!dojo._hasResource["dojo._base.lang"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojo._base.lang"] = true;
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dojo.provide("dojo._base.lang");
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(function(){
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var d = dojo, opts = Object.prototype.toString;
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// Crockford (ish) functions
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dojo.isString = function(/*anything*/ it){
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// summary:
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// Return true if it is a String
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return (typeof it == "string" || it instanceof String); // Boolean
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};
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dojo.isArray = function(/*anything*/ it){
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// summary:
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// Return true if it is an Array.
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// Does not work on Arrays created in other windows.
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return it && (it instanceof Array || typeof it == "array"); // Boolean
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};
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dojo.isFunction = function(/*anything*/ it){
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// summary:
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// Return true if it is a Function
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return opts.call(it) === "[object Function]";
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};
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dojo.isObject = function(/*anything*/ it){
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// summary:
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// Returns true if it is a JavaScript object (or an Array, a Function
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// or null)
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return it !== undefined &&
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(it === null || typeof it == "object" || d.isArray(it) || d.isFunction(it)); // Boolean
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};
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dojo.isArrayLike = function(/*anything*/ it){
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// summary:
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// similar to dojo.isArray() but more permissive
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// description:
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// Doesn't strongly test for "arrayness". Instead, settles for "isn't
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// a string or number and has a length property". Arguments objects
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// and DOM collections will return true when passed to
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// dojo.isArrayLike(), but will return false when passed to
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// dojo.isArray().
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// returns:
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// If it walks like a duck and quacks like a duck, return `true`
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return it && it !== undefined && // Boolean
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// keep out built-in constructors (Number, String, ...) which have length
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// properties
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!d.isString(it) && !d.isFunction(it) &&
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!(it.tagName && it.tagName.toLowerCase() == 'form') &&
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(d.isArray(it) || isFinite(it.length));
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};
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dojo.isAlien = function(/*anything*/ it){
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// summary:
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// Returns true if it is a built-in function or some other kind of
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// oddball that *should* report as a function but doesn't
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return it && !d.isFunction(it) && /\{\s*\[native code\]\s*\}/.test(String(it)); // Boolean
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};
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dojo.extend = function(/*Object*/ constructor, /*Object...*/ props){
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// summary:
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// Adds all properties and methods of props to constructor's
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// prototype, making them available to all instances created with
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// constructor.
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for(var i=1, l=arguments.length; i<l; i++){
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d._mixin(constructor.prototype, arguments[i]);
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}
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return constructor; // Object
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};
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dojo._hitchArgs = function(scope, method /*,...*/){
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var pre = d._toArray(arguments, 2);
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var named = d.isString(method);
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return function(){
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// arrayify arguments
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var args = d._toArray(arguments);
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// locate our method
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var f = named ? (scope||d.global)[method] : method;
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// invoke with collected args
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return f && f.apply(scope || this, pre.concat(args)); // mixed
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}; // Function
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};
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dojo.hitch = function(/*Object*/scope, /*Function|String*/method /*,...*/){
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// summary:
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// Returns a function that will only ever execute in the a given scope.
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// This allows for easy use of object member functions
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// in callbacks and other places in which the "this" keyword may
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// otherwise not reference the expected scope.
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// Any number of default positional arguments may be passed as parameters
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// beyond "method".
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// Each of these values will be used to "placehold" (similar to curry)
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// for the hitched function.
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// scope:
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// The scope to use when method executes. If method is a string,
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// scope is also the object containing method.
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// method:
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// A function to be hitched to scope, or the name of the method in
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// scope to be hitched.
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// example:
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// | dojo.hitch(foo, "bar")();
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// runs foo.bar() in the scope of foo
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// example:
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// | dojo.hitch(foo, myFunction);
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// returns a function that runs myFunction in the scope of foo
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// example:
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// Expansion on the default positional arguments passed along from
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// hitch. Passed args are mixed first, additional args after.
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// | var foo = { bar: function(a, b, c){ console.log(a, b, c); } };
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// | var fn = dojo.hitch(foo, "bar", 1, 2);
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// | fn(3); // logs "1, 2, 3"
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// example:
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// | var foo = { bar: 2 };
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// | dojo.hitch(foo, function(){ this.bar = 10; })();
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// execute an anonymous function in scope of foo
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if(arguments.length > 2){
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return d._hitchArgs.apply(d, arguments); // Function
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}
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if(!method){
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method = scope;
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scope = null;
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}
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if(d.isString(method)){
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scope = scope || d.global;
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if(!scope[method]){ throw(['dojo.hitch: scope["', method, '"] is null (scope="', scope, '")'].join('')); }
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return function(){ return scope[method].apply(scope, arguments || []); }; // Function
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}
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return !scope ? method : function(){ return method.apply(scope, arguments || []); }; // Function
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};
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/*=====
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dojo.delegate = function(obj, props){
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// summary:
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// Returns a new object which "looks" to obj for properties which it
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// does not have a value for. Optionally takes a bag of properties to
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// seed the returned object with initially.
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// description:
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// This is a small implementaton of the Boodman/Crockford delegation
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// pattern in JavaScript. An intermediate object constructor mediates
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// the prototype chain for the returned object, using it to delegate
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// down to obj for property lookup when object-local lookup fails.
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// This can be thought of similarly to ES4's "wrap", save that it does
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// not act on types but rather on pure objects.
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// obj:
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// The object to delegate to for properties not found directly on the
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// return object or in props.
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// props:
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// an object containing properties to assign to the returned object
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// returns:
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// an Object of anonymous type
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// example:
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// | var foo = { bar: "baz" };
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// | var thinger = dojo.delegate(foo, { thud: "xyzzy"});
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// | thinger.bar == "baz"; // delegated to foo
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// | foo.thud == undefined; // by definition
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// | thinger.thud == "xyzzy"; // mixed in from props
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// | foo.bar = "thonk";
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// | thinger.bar == "thonk"; // still delegated to foo's bar
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}
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=====*/
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dojo.delegate = dojo._delegate = (function(){
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// boodman/crockford delegation w/ cornford optimization
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function TMP(){}
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return function(obj, props){
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TMP.prototype = obj;
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var tmp = new TMP();
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TMP.prototype = null;
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if(props){
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d._mixin(tmp, props);
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}
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return tmp; // Object
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};
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})();
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/*=====
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dojo._toArray = function(obj, offset, startWith){
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// summary:
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// Converts an array-like object (i.e. arguments, DOMCollection) to an
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// array. Returns a new Array with the elements of obj.
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// obj: Object
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// the object to "arrayify". We expect the object to have, at a
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// minimum, a length property which corresponds to integer-indexed
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// properties.
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// offset: Number?
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// the location in obj to start iterating from. Defaults to 0.
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// Optional.
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// startWith: Array?
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// An array to pack with the properties of obj. If provided,
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// properties in obj are appended at the end of startWith and
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// startWith is the returned array.
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}
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=====*/
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var efficient = function(obj, offset, startWith){
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return (startWith||[]).concat(Array.prototype.slice.call(obj, offset||0));
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};
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var slow = function(obj, offset, startWith){
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var arr = startWith||[];
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for(var x = offset || 0; x < obj.length; x++){
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arr.push(obj[x]);
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}
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return arr;
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};
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dojo._toArray =
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d.isIE ? function(obj){
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return ((obj.item) ? slow : efficient).apply(this, arguments);
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} :
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efficient;
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dojo.partial = function(/*Function|String*/method /*, ...*/){
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// summary:
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// similar to hitch() except that the scope object is left to be
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// whatever the execution context eventually becomes.
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// description:
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// Calling dojo.partial is the functional equivalent of calling:
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// | dojo.hitch(null, funcName, ...);
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var arr = [ null ];
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return d.hitch.apply(d, arr.concat(d._toArray(arguments))); // Function
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};
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var extraNames = d._extraNames, extraLen = extraNames.length, empty = {};
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dojo.clone = function(/*anything*/ o){
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// summary:
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// Clones objects (including DOM nodes) and all children.
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// Warning: do not clone cyclic structures.
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if(!o || typeof o != "object" || d.isFunction(o)){
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// null, undefined, any non-object, or function
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return o; // anything
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}
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if(o.nodeType && "cloneNode" in o){
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// DOM Node
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return o.cloneNode(true); // Node
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}
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if(o instanceof Date){
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// Date
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return new Date(o.getTime()); // Date
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}
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if(o instanceof RegExp){
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// RegExp
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return new RegExp(o); // RegExp
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}
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var r, i, l, s, name;
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if(d.isArray(o)){
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// array
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r = [];
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for(i = 0, l = o.length; i < l; ++i){
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if(i in o){
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r.push(d.clone(o[i]));
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}
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}
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// we don't clone functions for performance reasons
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// }else if(d.isFunction(o)){
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// // function
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// r = function(){ return o.apply(this, arguments); };
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}else{
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// generic objects
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r = o.constructor ? new o.constructor() : {};
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}
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for(name in o){
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// the "tobj" condition avoid copying properties in "source"
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// inherited from Object.prototype. For example, if target has a custom
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// toString() method, don't overwrite it with the toString() method
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// that source inherited from Object.prototype
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s = o[name];
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if(!(name in r) || (r[name] !== s && (!(name in empty) || empty[name] !== s))){
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r[name] = d.clone(s);
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}
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}
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// IE doesn't recognize some custom functions in for..in
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if(extraLen){
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for(i = 0; i < extraLen; ++i){
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name = extraNames[i];
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s = o[name];
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if(!(name in r) || (r[name] !== s && (!(name in empty) || empty[name] !== s))){
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r[name] = s; // functions only, we don't clone them
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}
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}
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}
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return r; // Object
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};
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/*=====
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dojo.trim = function(str){
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// summary:
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// Trims whitespace from both sides of the string
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// str: String
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// String to be trimmed
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// returns: String
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// Returns the trimmed string
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// description:
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// This version of trim() was selected for inclusion into the base due
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// to its compact size and relatively good performance
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// (see [Steven Levithan's blog](http://blog.stevenlevithan.com/archives/faster-trim-javascript)
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// Uses String.prototype.trim instead, if available.
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// The fastest but longest version of this function is located at
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// dojo.string.trim()
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return ""; // String
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}
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=====*/
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dojo.trim = String.prototype.trim ?
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function(str){ return str.trim(); } :
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function(str){ return str.replace(/^\s\s*/, '').replace(/\s\s*$/, ''); };
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/*=====
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dojo.replace = function(tmpl, map, pattern){
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// summary:
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// Performs parameterized substitutions on a string. Throws an
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// exception if any parameter is unmatched.
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// tmpl: String
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// String to be used as a template.
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// map: Object|Function
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// If an object, it is used as a dictionary to look up substitutions.
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// If a function, it is called for every substitution with following
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// parameters: a whole match, a name, an offset, and the whole template
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// string (see https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/String/replace
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// for more details).
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// pattern: RegEx?
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// Optional regular expression objects that overrides the default pattern.
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// Must be global and match one item. The default is: /\{([^\}]+)\}/g,
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// which matches patterns like that: "{xxx}", where "xxx" is any sequence
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// of characters, which doesn't include "}".
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// returns: String
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// Returns the substituted string.
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// example:
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// | // uses a dictionary for substitutions:
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// | dojo.replace("Hello, {name.first} {name.last} AKA {nick}!",
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// | {
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// | nick: "Bob",
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// | name: {
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// | first: "Robert",
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// | middle: "X",
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// | last: "Cringely"
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// | }
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// | });
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// | // returns: Hello, Robert Cringely AKA Bob!
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// example:
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// | // uses an array for substitutions:
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// | dojo.replace("Hello, {0} {2}!",
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// | ["Robert", "X", "Cringely"]);
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// | // returns: Hello, Robert Cringely!
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// example:
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// | // uses a function for substitutions:
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// | function sum(a){
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// | var t = 0;
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// | dojo.forEach(a, function(x){ t += x; });
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// | return t;
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// | }
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// | dojo.replace(
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// | "{count} payments averaging {avg} USD per payment.",
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// | dojo.hitch(
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// | { payments: [11, 16, 12] },
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// | function(_, key){
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// | switch(key){
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// | case "count": return this.payments.length;
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// | case "min": return Math.min.apply(Math, this.payments);
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// | case "max": return Math.max.apply(Math, this.payments);
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// | case "sum": return sum(this.payments);
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// | case "avg": return sum(this.payments) / this.payments.length;
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// | }
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// | }
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// | )
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// | );
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// | // prints: 3 payments averaging 13 USD per payment.
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// example:
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// | // uses an alternative PHP-like pattern for substitutions:
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// | dojo.replace("Hello, ${0} ${2}!",
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// | ["Robert", "X", "Cringely"], /\$\{([^\}]+)\}/g);
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// | // returns: Hello, Robert Cringely!
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return ""; // String
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}
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=====*/
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var _pattern = /\{([^\}]+)\}/g;
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dojo.replace = function(tmpl, map, pattern){
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return tmpl.replace(pattern || _pattern, d.isFunction(map) ?
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map : function(_, k){ return d.getObject(k, false, map); });
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};
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})();
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}
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