define(["../has", "require"],
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function(has, require){
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"use strict";
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var testDiv = document.createElement("div");
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has.add("dom-qsa2.1", !!testDiv.querySelectorAll);
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has.add("dom-qsa3", function(){
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// test to see if we have a reasonable native selector engine available
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try{
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testDiv.innerHTML = "<p class='TEST'></p>"; // test kind of from sizzle
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// Safari can't handle uppercase or unicode characters when
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// in quirks mode, IE8 can't handle pseudos like :empty
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return testDiv.querySelectorAll(".TEST:empty").length == 1;
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}catch(e){}
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});
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var fullEngine;
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var acme = "./acme", lite = "./lite";
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return {
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// summary:
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// This module handles loading the appropriate selector engine for the given browser
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load: function(id, parentRequire, loaded, config){
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var req = require;
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// here we implement the default logic for choosing a selector engine
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id = id == "default" ? has("config-selectorEngine") || "css3" : id;
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id = id == "css2" || id == "lite" ? lite :
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id == "css2.1" ? has("dom-qsa2.1") ? lite : acme :
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id == "css3" ? has("dom-qsa3") ? lite : acme :
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id == "acme" ? acme : (req = parentRequire) && id;
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if(id.charAt(id.length-1) == '?'){
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id = id.substring(0,id.length - 1);
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var optionalLoad = true;
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}
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// the query engine is optional, only load it if a native one is not available or existing one has not been loaded
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if(optionalLoad && (has("dom-compliant-qsa") || fullEngine)){
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return loaded(fullEngine);
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}
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// load the referenced selector engine
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req([id], function(engine){
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if(id != "./lite"){
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fullEngine = engine;
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}
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loaded(engine);
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});
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}
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};
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});
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