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-define("dojo/has", ["require", "module"], function(require, module){
- // module:
- // dojo/has
- // summary:
- // Defines the has.js API and several feature tests used by dojo.
- // description:
- // This module defines the has API as described by the project has.js with the following additional features:
- //
- // - the has test cache is exposed at has.cache.
- // - the method has.add includes a forth parameter that controls whether or not existing tests are replaced
- // - the loader's has cache may be optionally copied into this module's has cahce.
- //
- // This module adopted from https://github.com/phiggins42/has.js; thanks has.js team!
-
- // try to pull the has implementation from the loader; both the dojo loader and bdLoad provide one
- // if using a foreign loader, then the has cache may be initialized via the config object for this module
- // WARNING: if a foreign loader defines require.has to be something other than the has.js API, then this implementation fail
- var has = require.has || function(){};
- if(! 1 ){
- var
- isBrowser =
- // the most fundamental decision: are we in the browser?
- typeof window != "undefined" &&
- typeof location != "undefined" &&
- typeof document != "undefined" &&
- window.location == location && window.document == document,
-
- // has API variables
- global = this,
- doc = isBrowser && document,
- element = doc && doc.createElement("DiV"),
- cache = (module.config && module.config()) || {};
-
- has = function(name){
- // summary:
- // Return the current value of the named feature.
- //
- // name: String|Integer
- // The name (if a string) or identifier (if an integer) of the feature to test.
- //
- // description:
- // Returns the value of the feature named by name. The feature must have been
- // previously added to the cache by has.add.
-
- return typeof cache[name] == "function" ? (cache[name] = cache[name](global, doc, element)) : cache[name]; // Boolean
- };
-
- has.cache = cache;
-
- has.add = function(name, test, now, force){
- // summary:
- // Register a new feature test for some named feature.
- // name: String|Integer
- // The name (if a string) or identifier (if an integer) of the feature to test.
- // test: Function
- // A test function to register. If a function, queued for testing until actually
- // needed. The test function should return a boolean indicating
- // the presence of a feature or bug.
- // now: Boolean?
- // Optional. Omit if `test` is not a function. Provides a way to immediately
- // run the test and cache the result.
- // force: Boolean?
- // Optional. If the test already exists and force is truthy, then the existing
- // test will be replaced; otherwise, add does not replace an existing test (that
- // is, by default, the first test advice wins).
- // example:
- // A redundant test, testFn with immediate execution:
- // | has.add("javascript", function(){ return true; }, true);
- //
- // example:
- // Again with the redundantness. You can do this in your tests, but we should
- // not be doing this in any internal has.js tests
- // | has.add("javascript", true);
- //
- // example:
- // Three things are passed to the testFunction. `global`, `document`, and a generic element
- // from which to work your test should the need arise.
- // | has.add("bug-byid", function(g, d, el){
- // | // g == global, typically window, yadda yadda
- // | // d == document object
- // | // el == the generic element. a `has` element.
- // | return false; // fake test, byid-when-form-has-name-matching-an-id is slightly longer
- // | });
-
- (typeof cache[name]=="undefined" || force) && (cache[name]= test);
- return now && has(name);
- };
-
- // since we're operating under a loader that doesn't provide a has API, we must explicitly initialize
- // has as it would have otherwise been initialized by the dojo loader; use has.add to the builder
- // can optimize these away iff desired
- 1 || has.add("host-browser", isBrowser);
- 1 || has.add("dom", isBrowser);
- 1 || has.add("dojo-dom-ready-api", 1);
- 1 || has.add("dojo-sniff", 1);
- }
-
- if( 1 ){
- // Common application level tests
- has.add("dom-addeventlistener", !!document.addEventListener);
- has.add("touch", "ontouchstart" in document);
- // I don't know if any of these tests are really correct, just a rough guess
- has.add("device-width", screen.availWidth || innerWidth);
-
- // Tests for DOMNode.attributes[] behavior:
- // - dom-attributes-explicit - attributes[] only lists explicitly user specified attributes
- // - dom-attributes-specified-flag (IE8) - need to check attr.specified flag to skip attributes user didn't specify
- // - Otherwise, in IE6-7. attributes[] will list hundreds of values, so need to do outerHTML to get attrs instead.
- var form = document.createElement("form");
- has.add("dom-attributes-explicit", form.attributes.length == 0); // W3C
- has.add("dom-attributes-specified-flag", form.attributes.length > 0 && form.attributes.length < 40); // IE8
- }
-
- has.clearElement = function(element){
- // summary:
- // Deletes the contents of the element passed to test functions.
- element.innerHTML= "";
- return element;
- };
-
- has.normalize = function(id, toAbsMid){
- // summary:
- // Resolves id into a module id based on possibly-nested tenary expression that branches on has feature test value(s).
- //
- // toAbsMid: Function
- // Resolves a relative module id into an absolute module id
- var
- tokens = id.match(/[\?:]|[^:\?]*/g), i = 0,
- get = function(skip){
- var term = tokens[i++];
- if(term == ":"){
- // empty string module name, resolves to 0
- return 0;
- }else{
- // postfixed with a ? means it is a feature to branch on, the term is the name of the feature
- if(tokens[i++] == "?"){
- if(!skip && has(term)){
- // matched the feature, get the first value from the options
- return get();
- }else{
- // did not match, get the second value, passing over the first
- get(true);
- return get(skip);
- }
- }
- // a module
- return term || 0;
- }
- };
- id = get();
- return id && toAbsMid(id);
- };
-
- has.load = function(id, parentRequire, loaded){
- // summary:
- // Conditional loading of AMD modules based on a has feature test value.
- // id: String
- // Gives the resolved module id to load.
- // parentRequire: Function
- // The loader require function with respect to the module that contained the plugin resource in it's
- // dependency list.
- // loaded: Function
- // Callback to loader that consumes result of plugin demand.
-
- if(id){
- parentRequire([id], loaded);
- }else{
- loaded();
- }
- };
-
- return has;
-});
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