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      1 function mergeArrays() {
      2   var arr = arguments[0] || [];
      3   for (var i = 1; i < arguments.length; i++) {
      4     arr = arr.concat(arguments[i]);
      5   }
      6   return arr;
      7 }
      8 
      9 var ALL_RESOURCES = mergeArrays(
     10   ABOUT_RESOURCES,
     11   DESIGN_RESOURCES,
     12   DISTRIBUTE_RESOURCES,
     13   GOOGLE_RESOURCES,
     14   GUIDE_RESOURCES,
     15   SAMPLES_RESOURCES,
     16   TOOLS_RESOURCES,
     17   TRAINING_RESOURCES,
     18   WORK_RESOURCES,
     19   YOUTUBE_RESOURCES,
     20   BLOGGER_RESOURCES,
     21   PREVIEW_RESOURCES
     22 );
     23 
     24 for (var i = 0; i < ALL_RESOURCES.length; i++) {
     25   ALL_RESOURCES[i].index = i;
     26 }
     27 
     28 function mergeMaps() {
     29   var allRes = {};
     30   var offset = 0;
     31 
     32   for (var i = 0; i < arguments.length; i++) {
     33     var r = arguments[i];
     34     for (var tag in r.map) {
     35       allRes[tag] = allRes[tag] || [];
     36       allRes[tag] = allRes[tag].concat(r.map[tag].map(function(i){ return ALL_RESOURCES[i + offset]; }));
     37     }
     38     offset += r.arr.length;
     39   }
     40 
     41   return allRes;
     42 }
     43 
     44 function setFromArray(arr) {
     45   arr = arr || [];
     46   var set = {};
     47   for (var i = 0; i < arr.length; i++) {
     48     set[arr[i]] = true;
     49   }
     50   return set;
     51 }
     52 
     53 function buildResourceLookupMap(resourceDict) {
     54   var map = {};
     55   for (var key in resourceDict) {
     56     var dictForKey = {};
     57     var srcArr = resourceDict[key];
     58     for (var i = 0; i < srcArr.length; i++) {
     59       dictForKey[srcArr[i].index] = true;
     60     }
     61     map[key] = dictForKey;
     62   }
     63   return map;
     64 }
     65 
     66 // Type lookups
     67 
     68 var ALL_RESOURCES_BY_TYPE = {
     69   'about': ABOUT_RESOURCES,
     70   'design': DESIGN_RESOURCES,
     71   'distribute': DISTRIBUTE_RESOURCES,
     72   'google': GOOGLE_RESOURCES,
     73   'guide': GUIDE_RESOURCES,
     74   'samples': SAMPLES_RESOURCES,
     75   'tools': TOOLS_RESOURCES,
     76   'training': TRAINING_RESOURCES,
     77   'preview': PREVIEW_RESOURCES,
     78   'work': WORK_RESOURCES,
     79   'youtube': YOUTUBE_RESOURCES,
     80   'blog': BLOGGER_RESOURCES
     81 };
     82 var IS_RESOURCE_OF_TYPE = buildResourceLookupMap(ALL_RESOURCES_BY_TYPE);
     83 
     84 // Tag lookups
     85 
     86 var ALL_RESOURCES_BY_TAG = mergeMaps(
     87   {map:ABOUT_BY_TAG,arr:ABOUT_RESOURCES},
     88   {map:DESIGN_BY_TAG,arr:DESIGN_RESOURCES},
     89   {map:DISTRIBUTE_BY_TAG,arr:DISTRIBUTE_RESOURCES},
     90   {map:GOOGLE_BY_TAG,arr:GOOGLE_RESOURCES},
     91   {map:GUIDE_BY_TAG,arr:GUIDE_RESOURCES},
     92   {map:SAMPLES_BY_TAG,arr:SAMPLES_RESOURCES},
     93   {map:TOOLS_BY_TAG,arr:TOOLS_RESOURCES},
     94   {map:TRAINING_BY_TAG,arr:TRAINING_RESOURCES},
     95   {map:YOUTUBE_BY_TAG,arr:YOUTUBE_RESOURCES},
     96   {map:BLOGGER_BY_TAG,arr:BLOGGER_RESOURCES}
     97 );
     98 var IS_RESOURCE_TAGGED = buildResourceLookupMap(ALL_RESOURCES_BY_TAG);
     99 
    100 // URL and language lookups
    101 
    102 var ALL_RESOURCES_BY_URL = {};
    103 var ALL_RESOURCES_BY_LANG = {};
    104 
    105 for (var i = 0; i < ALL_RESOURCES.length; i++) {
    106   var res = ALL_RESOURCES[i];
    107   var lang = res.lang;
    108   if (lang) {
    109     ALL_RESOURCES_BY_LANG[lang] = ALL_RESOURCES_BY_LANG[lang] || [];
    110     ALL_RESOURCES_BY_LANG[lang].push(res);
    111   }
    112   var url = res.url;
    113   if (url) {
    114     ALL_RESOURCES_BY_URL[url] = res;
    115   }
    116 }
    117 var IS_RESOURCE_IN_LANG = buildResourceLookupMap(ALL_RESOURCES_BY_LANG);
    118