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606 lines
21 KiB
JavaScript
606 lines
21 KiB
JavaScript
define("dojo/_base/lang", ["./kernel", "../has", "../sniff"], function(dojo, has){
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// module:
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// dojo/_base/lang
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has.add("bug-for-in-skips-shadowed", function(){
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// if true, the for-in iterator skips object properties that exist in Object's prototype (IE 6 - ?)
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for(var i in {toString: 1}){
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return 0;
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}
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return 1;
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});
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// Helper methods
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var _extraNames =
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has("bug-for-in-skips-shadowed") ?
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"hasOwnProperty.valueOf.isPrototypeOf.propertyIsEnumerable.toLocaleString.toString.constructor".split(".") : [],
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_extraLen = _extraNames.length,
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getProp = function(/*Array*/parts, /*Boolean*/create, /*Object*/context){
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var p, i = 0, dojoGlobal = dojo.global;
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if(!context){
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if(!parts.length){
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return dojoGlobal;
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}else{
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p = parts[i++];
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try{
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context = dojo.scopeMap[p] && dojo.scopeMap[p][1];
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}catch(e){}
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context = context || (p in dojoGlobal ? dojoGlobal[p] : (create ? dojoGlobal[p] = {} : undefined));
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}
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}
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while(context && (p = parts[i++])){
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context = (p in context ? context[p] : (create ? context[p] = {} : undefined));
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}
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return context; // mixed
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},
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opts = Object.prototype.toString,
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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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_pattern = /\{([^\}]+)\}/g;
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// Module export
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var lang = {
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// summary:
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// This module defines Javascript language extensions.
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// _extraNames: String[]
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// Lists property names that must be explicitly processed during for-in iteration
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// in environments that have has("bug-for-in-skips-shadowed") true.
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_extraNames:_extraNames,
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_mixin: function(dest, source, copyFunc){
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// summary:
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// Copies/adds all properties of source to dest; returns dest.
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// dest: Object
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// The object to which to copy/add all properties contained in source.
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// source: Object
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// The object from which to draw all properties to copy into dest.
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// copyFunc: Function?
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// The process used to copy/add a property in source; defaults to the Javascript assignment operator.
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// returns:
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// dest, as modified
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// description:
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// All properties, including functions (sometimes termed "methods"), excluding any non-standard extensions
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// found in Object.prototype, are copied/added to dest. Copying/adding each particular property is
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// delegated to copyFunc (if any); copyFunc defaults to the Javascript assignment operator if not provided.
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// Notice that by default, _mixin executes a so-called "shallow copy" and aggregate types are copied/added by reference.
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var name, s, i, empty = {};
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for(name in source){
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// the (!(name in empty) || empty[name] !== s) condition avoids copying properties in "source"
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// inherited from Object.prototype. For example, if dest has a custom toString() method,
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// don't overwrite it with the toString() method that source inherited from Object.prototype
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s = source[name];
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if(!(name in dest) || (dest[name] !== s && (!(name in empty) || empty[name] !== s))){
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dest[name] = copyFunc ? copyFunc(s) : s;
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}
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}
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if(has("bug-for-in-skips-shadowed")){
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if(source){
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for(i = 0; i < _extraLen; ++i){
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name = _extraNames[i];
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s = source[name];
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if(!(name in dest) || (dest[name] !== s && (!(name in empty) || empty[name] !== s))){
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dest[name] = copyFunc ? copyFunc(s) : s;
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}
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}
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}
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}
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return dest; // Object
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},
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mixin: function(dest, sources){
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// summary:
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// Copies/adds all properties of one or more sources to dest; returns dest.
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// dest: Object
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// The object to which to copy/add all properties contained in source. If dest is falsy, then
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// a new object is manufactured before copying/adding properties begins.
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// sources: Object...
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// One of more objects from which to draw all properties to copy into dest. sources are processed
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// left-to-right and if more than one of these objects contain the same property name, the right-most
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// value "wins".
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// returns: Object
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// dest, as modified
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// description:
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// All properties, including functions (sometimes termed "methods"), excluding any non-standard extensions
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// found in Object.prototype, are copied/added from sources to dest. sources are processed left to right.
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// The Javascript assignment operator is used to copy/add each property; therefore, by default, mixin
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// executes a so-called "shallow copy" and aggregate types are copied/added by reference.
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// example:
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// make a shallow copy of an object
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// | var copy = lang.mixin({}, source);
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// example:
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// many class constructors often take an object which specifies
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// values to be configured on the object. In this case, it is
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// often simplest to call `lang.mixin` on the `this` object:
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// | declare("acme.Base", null, {
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// | constructor: function(properties){
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// | // property configuration:
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// | lang.mixin(this, properties);
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// |
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// | console.log(this.quip);
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// | // ...
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// | },
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// | quip: "I wasn't born yesterday, you know - I've seen movies.",
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// | // ...
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// | });
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// |
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// | // create an instance of the class and configure it
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// | var b = new acme.Base({quip: "That's what it does!" });
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// example:
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// copy in properties from multiple objects
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// | var flattened = lang.mixin(
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// | {
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// | name: "Frylock",
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// | braces: true
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// | },
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// | {
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// | name: "Carl Brutanananadilewski"
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// | }
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// | );
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// |
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// | // will print "Carl Brutanananadilewski"
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// | console.log(flattened.name);
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// | // will print "true"
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// | console.log(flattened.braces);
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if(!dest){ dest = {}; }
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for(var i = 1, l = arguments.length; i < l; i++){
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lang._mixin(dest, arguments[i]);
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}
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return dest; // Object
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},
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setObject: function(name, value, context){
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// summary:
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// Set a property from a dot-separated string, such as "A.B.C"
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// description:
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// Useful for longer api chains where you have to test each object in
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// the chain, or when you have an object reference in string format.
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// Objects are created as needed along `path`. Returns the passed
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// value if setting is successful or `undefined` if not.
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// name: String
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// Path to a property, in the form "A.B.C".
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// value: anything
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// value or object to place at location given by name
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// context: Object?
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// Optional. Object to use as root of path. Defaults to
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// `dojo.global`.
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// example:
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// set the value of `foo.bar.baz`, regardless of whether
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// intermediate objects already exist:
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// | lang.setObject("foo.bar.baz", value);
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// example:
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// without `lang.setObject`, we often see code like this:
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// | // ensure that intermediate objects are available
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// | if(!obj["parent"]){ obj.parent = {}; }
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// | if(!obj.parent["child"]){ obj.parent.child = {}; }
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// | // now we can safely set the property
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// | obj.parent.child.prop = "some value";
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// whereas with `lang.setObject`, we can shorten that to:
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// | lang.setObject("parent.child.prop", "some value", obj);
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var parts = name.split("."), p = parts.pop(), obj = getProp(parts, true, context);
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return obj && p ? (obj[p] = value) : undefined; // Object
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},
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getObject: function(name, create, context){
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// summary:
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// Get a property from a dot-separated string, such as "A.B.C"
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// description:
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// Useful for longer api chains where you have to test each object in
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// the chain, or when you have an object reference in string format.
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// name: String
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// Path to an property, in the form "A.B.C".
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// create: Boolean?
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// Optional. Defaults to `false`. If `true`, Objects will be
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// created at any point along the 'path' that is undefined.
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// context: Object?
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// Optional. Object to use as root of path. Defaults to
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// 'dojo.global'. Null may be passed.
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return getProp(name.split("."), create, context); // Object
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},
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exists: function(name, obj){
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// summary:
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// determine if an object supports a given method
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// description:
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// useful for longer api chains where you have to test each object in
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// the chain. Useful for object and method detection.
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// name: String
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// Path to an object, in the form "A.B.C".
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// obj: Object?
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// Object to use as root of path. Defaults to
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// 'dojo.global'. Null may be passed.
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// example:
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// | // define an object
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// | var foo = {
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// | bar: { }
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// | };
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// |
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// | // search the global scope
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// | lang.exists("foo.bar"); // true
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// | lang.exists("foo.bar.baz"); // false
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// |
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// | // search from a particular scope
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// | lang.exists("bar", foo); // true
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// | lang.exists("bar.baz", foo); // false
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return lang.getObject(name, false, obj) !== undefined; // Boolean
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},
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// Crockford (ish) functions
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isString: function(it){
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// summary:
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// Return true if it is a String
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// it: anything
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// Item to test.
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return (typeof it == "string" || it instanceof String); // Boolean
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},
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isArray: function(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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// it: anything
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// Item to test.
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return it && (it instanceof Array || typeof it == "array"); // Boolean
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},
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isFunction: function(it){
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// summary:
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// Return true if it is a Function
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// it: anything
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// Item to test.
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return opts.call(it) === "[object Function]";
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},
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isObject: function(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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// it: anything
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// Item to test.
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return it !== undefined &&
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(it === null || typeof it == "object" || lang.isArray(it) || lang.isFunction(it)); // Boolean
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},
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isArrayLike: function(it){
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// summary:
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// similar to isArray() but more permissive
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// it: anything
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// Item to test.
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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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// 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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// isArrayLike(), but will return false when passed to
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// isArray().
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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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!lang.isString(it) && !lang.isFunction(it) &&
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!(it.tagName && it.tagName.toLowerCase() == 'form') &&
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(lang.isArray(it) || isFinite(it.length));
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},
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isAlien: function(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 && !lang.isFunction(it) && /\{\s*\[native code\]\s*\}/.test(String(it)); // Boolean
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},
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extend: function(ctor, 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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// ctor: Object
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// Target constructor to extend.
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// props: Object
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// One or more objects to mix into ctor.prototype
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for(var i=1, l=arguments.length; i<l; i++){
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lang._mixin(ctor.prototype, arguments[i]);
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}
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return ctor; // Object
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},
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_hitchArgs: function(scope, method){
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var pre = lang._toArray(arguments, 2);
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var named = lang.isString(method);
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return function(){
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// arrayify arguments
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var args = lang._toArray(arguments);
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// locate our method
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var f = named ? (scope||dojo.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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hitch: function(scope, 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: Object
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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: Function|String...
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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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// | lang.hitch(foo, "bar")();
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// runs foo.bar() in the scope of foo
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// example:
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// | lang.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 = lang.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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// | lang.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 lang._hitchArgs.apply(dojo, 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(lang.isString(method)){
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scope = scope || dojo.global;
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if(!scope[method]){ throw(['lang.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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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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lang._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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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 implementation 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: Object
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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: Object...
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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 = lang.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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_toArray: has("ie") ?
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(function(){
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function slow(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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return 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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/*=====
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_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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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 lang.partial is the functional equivalent of calling:
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// | lang.hitch(null, funcName, ...);
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// method:
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// The function to "wrap"
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var arr = [ null ];
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return lang.hitch.apply(dojo, arr.concat(lang._toArray(arguments))); // Function
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},
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clone: function(/*anything*/ src){
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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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// src:
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// The object to clone
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if(!src || typeof src != "object" || lang.isFunction(src)){
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// null, undefined, any non-object, or function
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return src; // anything
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}
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if(src.nodeType && "cloneNode" in src){
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// DOM Node
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return src.cloneNode(true); // Node
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}
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if(src instanceof Date){
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// Date
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return new Date(src.getTime()); // Date
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}
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if(src instanceof RegExp){
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// RegExp
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return new RegExp(src); // RegExp
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}
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var r, i, l;
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if(lang.isArray(src)){
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// array
|
|
r = [];
|
|
for(i = 0, l = src.length; i < l; ++i){
|
|
if(i in src){
|
|
r.push(lang.clone(src[i]));
|
|
}
|
|
}
|
|
// we don't clone functions for performance reasons
|
|
// }else if(d.isFunction(src)){
|
|
// // function
|
|
// r = function(){ return src.apply(this, arguments); };
|
|
}else{
|
|
// generic objects
|
|
r = src.constructor ? new src.constructor() : {};
|
|
}
|
|
return lang._mixin(r, src, lang.clone);
|
|
},
|
|
|
|
|
|
trim: String.prototype.trim ?
|
|
function(str){ return str.trim(); } :
|
|
function(str){ return str.replace(/^\s\s*/, '').replace(/\s\s*$/, ''); },
|
|
/*=====
|
|
trim: function(str){
|
|
// summary:
|
|
// Trims whitespace from both sides of the string
|
|
// str: String
|
|
// String to be trimmed
|
|
// returns: String
|
|
// Returns the trimmed string
|
|
// description:
|
|
// This version of trim() was selected for inclusion into the base due
|
|
// to its compact size and relatively good performance
|
|
// (see [Steven Levithan's blog](http://blog.stevenlevithan.com/archives/faster-trim-javascript)
|
|
// Uses String.prototype.trim instead, if available.
|
|
// The fastest but longest version of this function is located at
|
|
// lang.string.trim()
|
|
},
|
|
=====*/
|
|
|
|
replace: function(tmpl, map, pattern){
|
|
// summary:
|
|
// Performs parameterized substitutions on a string. Throws an
|
|
// exception if any parameter is unmatched.
|
|
// tmpl: String
|
|
// String to be used as a template.
|
|
// map: Object|Function
|
|
// If an object, it is used as a dictionary to look up substitutions.
|
|
// If a function, it is called for every substitution with following parameters:
|
|
// a whole match, a name, an offset, and the whole template
|
|
// string (see https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/String/replace
|
|
// for more details).
|
|
// pattern: RegEx?
|
|
// Optional regular expression objects that overrides the default pattern.
|
|
// Must be global and match one item. The default is: /\{([^\}]+)\}/g,
|
|
// which matches patterns like that: "{xxx}", where "xxx" is any sequence
|
|
// of characters, which doesn't include "}".
|
|
// returns: String
|
|
// Returns the substituted string.
|
|
// example:
|
|
// | // uses a dictionary for substitutions:
|
|
// | lang.replace("Hello, {name.first} {name.last} AKA {nick}!",
|
|
// | {
|
|
// | nick: "Bob",
|
|
// | name: {
|
|
// | first: "Robert",
|
|
// | middle: "X",
|
|
// | last: "Cringely"
|
|
// | }
|
|
// | });
|
|
// | // returns: Hello, Robert Cringely AKA Bob!
|
|
// example:
|
|
// | // uses an array for substitutions:
|
|
// | lang.replace("Hello, {0} {2}!",
|
|
// | ["Robert", "X", "Cringely"]);
|
|
// | // returns: Hello, Robert Cringely!
|
|
// example:
|
|
// | // uses a function for substitutions:
|
|
// | function sum(a){
|
|
// | var t = 0;
|
|
// | arrayforEach(a, function(x){ t += x; });
|
|
// | return t;
|
|
// | }
|
|
// | lang.replace(
|
|
// | "{count} payments averaging {avg} USD per payment.",
|
|
// | lang.hitch(
|
|
// | { payments: [11, 16, 12] },
|
|
// | function(_, key){
|
|
// | switch(key){
|
|
// | case "count": return this.payments.length;
|
|
// | case "min": return Math.min.apply(Math, this.payments);
|
|
// | case "max": return Math.max.apply(Math, this.payments);
|
|
// | case "sum": return sum(this.payments);
|
|
// | case "avg": return sum(this.payments) / this.payments.length;
|
|
// | }
|
|
// | }
|
|
// | )
|
|
// | );
|
|
// | // prints: 3 payments averaging 13 USD per payment.
|
|
// example:
|
|
// | // uses an alternative PHP-like pattern for substitutions:
|
|
// | lang.replace("Hello, ${0} ${2}!",
|
|
// | ["Robert", "X", "Cringely"], /\$\{([^\}]+)\}/g);
|
|
// | // returns: Hello, Robert Cringely!
|
|
|
|
return tmpl.replace(pattern || _pattern, lang.isFunction(map) ?
|
|
map : function(_, k){ return lang.getObject(k, false, map); });
|
|
}
|
|
};
|
|
|
|
1 && lang.mixin(dojo, lang);
|
|
|
|
return lang;
|
|
});
|
|
|