lib/dojo/selector/_loader.js.uncompressed.js

   1 define("dojo/selector/_loader", ["../has", "require"],
   2                 function(has, require){
   3
   4 "use strict";
   5 var testDiv = document.createElement("div");
   6 has.add("dom-qsa2.1", !!testDiv.querySelectorAll);
   7 has.add("dom-qsa3", function(){
   8                         // test to see if we have a reasonable native selector engine available
   9                         try{
  10                                 testDiv.innerHTML = "<p class='TEST'></p>"; // test kind of from sizzle
  11                                 // Safari can't handle uppercase or unicode characters when
  12                                 // in quirks mode, IE8 can't handle pseudos like :empty
  13                                 return testDiv.querySelectorAll(".TEST:empty").length == 1;
  14                         }catch(e){}
  15                 });
  16 var fullEngine;
  17 var acme = "./acme", lite = "./lite";
  18 return {
  19         // summary:
  20         //              This module handles loading the appropriate selector engine for the given browser
  21
  22         load: function(id, parentRequire, loaded, config){
  23                 var req = require;
  24                 // here we implement the default logic for choosing a selector engine
  25                 id = id == "default" ? has("config-selectorEngine") || "css3" : id;
  26                 id = id == "css2" || id == "lite" ? lite :
  27                                 id == "css2.1" ? has("dom-qsa2.1") ? lite : acme :
  28                                 id == "css3" ? has("dom-qsa3") ? lite : acme :
  29                                 id == "acme" ? acme : (req = parentRequire) && id;
  30                 if(id.charAt(id.length-1) == '?'){
  31                         id = id.substring(0,id.length - 1);
  32                         var optionalLoad = true;
  33                 }
  34                 // the query engine is optional, only load it if a native one is not available or existing one has not been loaded
  35                 if(optionalLoad && (has("dom-compliant-qsa") || fullEngine)){
  36                         return loaded(fullEngine);
  37                 }
  38                 // load the referenced selector engine
  39                 req([id], function(engine){
  40                         if(id != "./lite"){
  41                                 fullEngine = engine;
  42                         }
  43                         loaded(engine);
  44                 });
  45         }
  46 };
  47 });