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