A semantic search engine for source code https://bitshift.benkurtovic.com/
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  1. /*
  2. * @file Manages all library initialization, jQuery callbacks, query entry
  3. * callbacks, server querying, and results diplay for `index.html`.
  4. */
  5. var advancedSearchDiv = $("div#advanced-search");
  6. var advancedSearchButton = $("button#advanced-search");
  7. FINISH_TYPING_INTERVAL = 650;
  8. var searchBar = $("form#search-bar input[type='text']")[0];
  9. var resultsDiv = $("div#results")[0];
  10. var typingTimer, scrollTimer, lastValue;
  11. var searchResultsPage = 1;
  12. /*
  13. * Set all page callbacks.
  14. */
  15. (function setHomePageCallbabacks(){
  16. var results = $('#results').get(0);
  17. // Enable infinite scrolling down the results page.
  18. $(window).scroll(function(){
  19. if($(window).scrollTop() + $(window).height() == $(document).height() &&
  20. resultsDiv.querySelectorAll(".result").length > 0)
  21. loadMoreResults();
  22. clearTimeout(scrollTimer);
  23. if (!results.classList.contains('disable-hover'))
  24. results.classList.add('disable-hover')
  25. scrollTimer = setTimeout(function(){
  26. if (results.classList.contains('disable-hover'))
  27. results.classList.remove('disable-hover');
  28. }, 200);
  29. });
  30. // Toggle the advanced-search form's visibility.
  31. advancedSearchButton.click(function(){
  32. var searchField = $("div#search-field");
  33. if(!advancedSearchDiv.hasClass("visible")){
  34. searchField.addClass("partly-visible");
  35. advancedSearchDiv.fadeIn(500).addClass("visible");
  36. advancedSearchButton.addClass("clicked");
  37. }
  38. else {
  39. advancedSearchDiv.hide().removeClass("visible");
  40. advancedSearchButton.removeClass("clicked");
  41. if($("div#results .result").length == 0)
  42. searchField.removeClass("partly-visible");
  43. clearResults();
  44. }
  45. });
  46. // Enable capturing the `enter` key.
  47. $("form#search-bar").submit(function(event){
  48. event.preventDefault();
  49. return false;
  50. });
  51. searchBar.onkeyup = typingTimer;
  52. }());
  53. /*
  54. * Set keyboard shortcut mappings.
  55. */
  56. (function resultsHotkeys(){
  57. /*
  58. * If the currently viewed result is not the first, scroll to the previous
  59. * result.
  60. */
  61. var previousResult = function(){
  62. var currResult = $(".display-all");
  63. if(currResult.length) {
  64. currResult.removeClass("display-all");
  65. currResult = currResult.closest(".result").prev(".result");
  66. } else {
  67. currResult = $(document.querySelectorAll(".result")[0]);
  68. }
  69. currResult.addClass("display-all");
  70. currResult.each(function(){
  71. $('html,body').stop().animate({
  72. scrollTop: $(this).offset().top - (
  73. $(window).height() - $(this).outerHeight(true)) / 2
  74. }, 140);
  75. });
  76. };
  77. /*
  78. * If the currently viewed result is not the last, scroll to the next
  79. * result.
  80. */
  81. var nextResult = function(){
  82. var currResult = $(".display-all");
  83. if(currResult.length) {
  84. currResult.removeClass("display-all");
  85. currResult = currResult.closest(".result").next(".result");
  86. } else {
  87. currResult = $(document.querySelectorAll(".result")[0]);
  88. }
  89. currResult.addClass('display-all');
  90. currResult.each(function(){
  91. $('html,body').stop().animate({
  92. scrollTop: $(this).offset().top - (
  93. $(window).height() - $(this).outerHeight(true)) / 2
  94. }, 140);
  95. });
  96. };
  97. var displayHotkeyHelp = function(){
  98. var help = $("div#hotkey-help");
  99. if(help.hasClass("hidden"))
  100. help.fadeIn(420);
  101. else
  102. help.fadeOut(420);
  103. $("div#body").toggleClass("faded");
  104. help.toggleClass("hidden");
  105. }
  106. var hotkeyActions = {
  107. "k" : previousResult,
  108. "j" : nextResult,
  109. "h" : previousSymbolMatch,
  110. "l" : nextSymbolMatch,
  111. "?" : displayHotkeyHelp
  112. };
  113. $(window).keypress(function(key){
  114. for(var hotkey in hotkeyActions){
  115. var keyChar = String.fromCharCode(key.keyCode);
  116. if(keyChar == hotkey &&
  117. !($(key.target).is("textarea") || $(key.target).is("input")))
  118. hotkeyActions[keyChar]();
  119. }
  120. });
  121. }());
  122. //Obtained by parsing python file with pygments
  123. var codeExample = '<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1\n 2\n 3\n 4\n 5\n 6\n 7\n 8\n 9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n25\n26\n27\n28\n29\n30\n31\n32\n33\n34\n35\n36\n37\n38\n39\n40</pre></div></td><td class="code"><div class="highlight"><pre><span class="sd">&quot;&quot;&quot;</span>\n<span class="sd">Module to contain all the project&#39;s Flask server plumbing.</span>\n<span class="sd">&quot;&quot;&quot;</span>\n\n<span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">Flask</span>\n<span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">render_template</span><span class="p">,</span> <span class="n">session</span>\n\n<span class="kn">from</span> <span class="nn">bitshift</span> <span class="kn">import</span> <span class="n">assets</span>\n<span class="c"># from bitshift.database import Database</span>\n<span class="c"># from bitshift.query import parse_query</span>\n\n<span class="hll"><span class="n">app</span> <span class="o">=</span> <span class="n">Flask</span><span class="p">(</span><span class="n">__name__</span><span class="p">)</span>\n</span><span class="hll"><span class="n">app</span><span class="o">.</span><span class="n">config</span><span class="o">.</span><span class="n">from_object</span><span class="p">(</span><span class="s">&quot;bitshift.config&quot;</span><span class="p">)</span>\n</span>\n<span class="hll"><span class="n">app_env</span> <span class="o">=</span> <span class="n">app</span><span class="o">.</span><span class="n">jinja_env</span>\n</span><span class="hll"><span class="n">app_env</span><span class="o">.</span><span class="n">line_statement_prefix</span> <span class="o">=</span> <span class="s">&quot;=&quot;</span>\n</span><span class="hll"><span class="n">app_env</span><span class="o">.</span><span class="n">globals</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">assets</span><span class="o">=</span><span class="n">assets</span><span class="p">)</span>\n</span>\n<span class="c"># database = Database()</span>\n\n<span class="hll"><span class="nd">@app.route</span><span class="p">(</span><span class="s">&quot;/&quot;</span><span class="p">)</span>\n</span><span class="k">def</span> <span class="nf">index</span><span class="p">():</span>\n <span class="k">return</span> <span class="n">render_template</span><span class="p">(</span><span class="s">&quot;index.html&quot;</span><span class="p">)</span>\n\n<span class="hll"><span class="nd">@app.route</span><span class="p">(</span><span class="s">&quot;/search/&lt;query&gt;&quot;</span><span class="p">)</span>\n</span><span class="k">def</span> <span class="nf">search</span><span class="p">(</span><span class="n">query</span><span class="p">):</span>\n <span class="c"># tree = parse_query(query)</span>\n <span class="c"># database.search(tree)</span>\n <span class="k">pass</span>\n\n<span class="hll"><span class="nd">@app.route</span><span class="p">(</span><span class="s">&quot;/about&quot;</span><span class="p">)</span>\n</span><span class="k">def</span> <span class="nf">about</span><span class="p">():</span>\n <span class="k">return</span> <span class="n">render_template</span><span class="p">(</span><span class="s">&quot;about.html&quot;</span><span class="p">)</span>\n\n<span class="hll"><span class="nd">@app.route</span><span class="p">(</span><span class="s">&quot;/developers&quot;</span><span class="p">)</span>\n</span><span class="k">def</span> <span class="nf">developers</span><span class="p">():</span>\n <span class="k">return</span> <span class="n">render_template</span><span class="p">(</span><span class="s">&quot;developers.html&quot;</span><span class="p">)</span>\n\n<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&quot;__main__&quot;</span><span class="p">:</span>\n<span class="hll"> <span class="n">app</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="n">deaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabug</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>\n</span></pre></div>\n</td></tr></table>'
  124. var testCodelet = {
  125. 'url': 'https://github.com/earwig/bitshift/blob/develop/app.py',
  126. 'name': 'app.py',
  127. 'lang': 'python',
  128. 'created': 'May 10, 2014 aaaaaaaaaa',
  129. 'modified': '2 days ago',
  130. 'origin': ['GitHub', 'https://github.com', ''],
  131. 'authors': ['sevko', 'earwig', 'another author', 'a'],
  132. 'code': codeExample
  133. };
  134. // Enable infinite scrolling down the results page.
  135. $(window).scroll(function() {
  136. var searchField = $("div#search-field");
  137. if($(window).scrollTop() + $(window).height() == $(document).height() &&
  138. searchField.hasClass('partly-visible')){
  139. loadMoreResults();
  140. }
  141. });
  142. /*
  143. * Clear the existing timer and set a new one the the user types text into the
  144. * search bar.
  145. */
  146. function typingTimer(event){
  147. clearTimeout(typingTimer);
  148. var enterKeyCode = 13;
  149. if(event.keyCode != enterKeyCode){
  150. if(lastValue != searchBar.value)
  151. typingTimer = setTimeout(finishedTyping, FINISH_TYPING_INTERVAL);
  152. }
  153. else {
  154. event.preventDefault();
  155. finishedTyping();
  156. return false;
  157. }
  158. };
  159. /*
  160. * Callback which queries the server whenver the user stops typing.
  161. *
  162. * Whenever the user doesn't type for a `FINISH_TYPING_INTERVAL` after having
  163. * entered new text in the search bar, send the current query request to the
  164. * server.
  165. */
  166. function finishedTyping(){
  167. lastValue = searchBar.value;
  168. var searchField = $("div#search-field");
  169. clearResults();
  170. if(searchBar.value){
  171. searchField.addClass("partly-visible");
  172. populateResults();
  173. }
  174. else {
  175. searchField.removeClass("partly-visible");
  176. $("div#advanced-search").fadeOut(50);
  177. advancedSearchButton.removeClass("clicked");
  178. clearResults();
  179. }
  180. }
  181. /*
  182. * Removes any child elements of `div#results`.
  183. */
  184. function clearResults(){
  185. while(resultsDiv.firstChild)
  186. resultsDiv.removeChild(resultsDiv.firstChild);
  187. }
  188. /*
  189. * Create a result element based upon a codelet instance.
  190. *
  191. * @return {Element} The result element.
  192. */
  193. function createResult(codelet) {
  194. var maxAttributeLength = 20;
  195. //Level 1
  196. var newDiv = document.createElement("div"),
  197. table = document.createElement("table"),
  198. row = document.createElement("tr");
  199. //Level 2
  200. var displayInfo = document.createElement("div"),
  201. codeElt = document.createElement("td"),
  202. hiddenInfoContainer = document.createElement("td"),
  203. hiddenInfo = document.createElement("div"),
  204. cycle = document.createElement("div");
  205. //Level 3
  206. var title = document.createElement("span"),
  207. site = document.createElement("span"),
  208. nextMatch = document.createElement("a"),
  209. prevMatch = document.createElement("a"),
  210. dateModified = document.createElement("div"),
  211. language = document.createElement("div"),
  212. dateCreated = document.createElement("div"),
  213. authors = document.createElement("div");
  214. //Classes and ID's
  215. newDiv.classList.add('result');
  216. displayInfo.id = 'display-info';
  217. codeElt.id = 'code';
  218. hiddenInfo.id = 'hidden-info';
  219. cycle.id = 'cycle-matches'
  220. title.id = 'title';
  221. site.id = 'site';
  222. nextMatch.id = 'next-match';
  223. nextMatch.href = '#';
  224. prevMatch.id = 'prev-match';
  225. prevMatch.href = '#';
  226. dateModified.id = 'date-modified';
  227. language.id = 'language';
  228. dateCreated.id = 'date-created';
  229. authors.id = 'authors';
  230. //Add the bulk of the html
  231. title.innerHTML = ' &raquo; <a href="' + codelet.url + '">'
  232. + codelet.name + '</a>';
  233. site.innerHTML = '<a href="' + codelet.origin[1] + '">' +
  234. codelet.origin[0] +'</a>';
  235. nextMatch.innerHTML = 'next match';
  236. prevMatch.innerHTML = 'prev match';
  237. language.innerHTML = 'Language: <span>' + codelet.lang + '</span>';
  238. dateModified.innerHTML = 'Last modified: <span>' + codelet.modified +
  239. '</span>';
  240. // Needs to be changed from int to string on the server
  241. dateCreated.innerHTML = 'Created: <span>' +
  242. codelet.created.substring(0, maxAttributeLength) + '</span>';
  243. var authorsHtml = 'Authors: <span>';
  244. var currLength = 0;
  245. var authorsList = [];
  246. for(var auth = 0; auth < codelet.authors.length; auth++){
  247. currLength += codelet.authors[auth].length;
  248. if(maxAttributeLength < currLength){
  249. authorsList.push("...");
  250. break;
  251. }
  252. else
  253. authorsList.push('<a href=#>' + codelet.authors[auth] + '</a>');
  254. }
  255. authors.innerHTML = "Authors: <span>" + authorsList.join(", ") + "</span>";
  256. // Needs to be processed on the server
  257. codeElt.innerHTML = '<div id=tablecontainer>' + codelet.code + '</div>';
  258. //Event binding
  259. $(newDiv).on('mousemove', function(e) {
  260. var holdCondition = $('.disable-hover');
  261. if(holdCondition.length == 0) {
  262. $(this).siblings().removeClass('display-all');
  263. $(this).addClass('display-all');
  264. }
  265. });
  266. $(newDiv).on('mouseleave', function(e) {
  267. var holdCondition = $('.disable-hover');
  268. if(holdCondition.length == 0)
  269. $(this).removeClass('display-all');
  270. });
  271. $(nextMatch).click(function(e) {
  272. e.stopPropagation();
  273. e.preventDefault();
  274. nextSymbolMatch();
  275. });
  276. $(prevMatch).click(function(e) {
  277. e.stopPropagation();
  278. e.preventDefault();
  279. previousSymbolMatch();
  280. });
  281. //Finish and append elements to parent elements
  282. hiddenInfo.appendChild(dateCreated);
  283. hiddenInfo.appendChild(dateModified);
  284. hiddenInfo.appendChild(language);
  285. hiddenInfo.appendChild(authors);
  286. hiddenInfoContainer.appendChild(hiddenInfo);
  287. row.appendChild(codeElt);
  288. row.appendChild(hiddenInfoContainer);
  289. table.appendChild(row);
  290. displayInfo.appendChild(site);
  291. displayInfo.appendChild(title);
  292. cycle.appendChild(prevMatch);
  293. cycle.appendChild(nextMatch);
  294. newDiv.appendChild(displayInfo);
  295. newDiv.appendChild(table);
  296. return newDiv;
  297. }
  298. function previousSymbolMatch() {
  299. var currResult = $(".display-all"),
  300. currMatch = currResult.find(".hll.current"),
  301. matches = currResult.find(".hll"),
  302. scrollDiv = currResult.find("#tablecontainer");
  303. if (currMatch.length == 0)
  304. currMatch = matches[0];
  305. else
  306. currMatch.removeClass('current');
  307. var index = matches.index(currMatch.get(0)) - 1;
  308. index = index <= 0 ? matches.length - 1 : index;
  309. var newMatch = $(matches[index]);
  310. scrollDiv.scrollTop(scrollDiv.scrollTop()
  311. - scrollDiv.height() / 2
  312. + newMatch.position().top + newMatch.height() / 2);
  313. newMatch.effect("highlight", {color: '#FFF'}, 750)
  314. newMatch.addClass('current');
  315. };
  316. function nextSymbolMatch() {
  317. var currResult = $(".display-all"),
  318. currMatch = currResult.find(".hll.current"),
  319. matches = currResult.find(".hll"),
  320. scrollDiv = currResult.find("#tablecontainer");
  321. if (currMatch.length == 0)
  322. currMatch = $(matches[0]);
  323. else
  324. currMatch.removeClass("current");
  325. var index = matches.index(currMatch.get(0)) + 1;
  326. index = index >= matches.length ? 0 : index;
  327. var newMatch = $(matches[index]);
  328. scrollDiv.scrollTop(scrollDiv.scrollTop()
  329. - scrollDiv.height() / 2
  330. + newMatch.position().top + newMatch.height() / 2);
  331. newMatch.effect("highlight", {color: "#FFF"}, 750)
  332. newMatch.addClass("current");
  333. };
  334. /*
  335. * AJAX the current query string to the server, and return its response.
  336. *
  337. * @return {Array} The server's response in the form of `div.result` DOM
  338. * elements, to fill `div#results`.
  339. */
  340. function queryServer(){
  341. var queryUrl = document.URL + "search.json?" + $.param({
  342. "q" : searchBar.value,
  343. "p" : searchResultsPage++
  344. });
  345. var results = $.Deferred();
  346. $.getJSON(queryUrl, function(result){
  347. var resultDivs = [];
  348. if("error" in result)
  349. insertErrorMessage(result["error"]);
  350. else if(result["results"].length == 0 && searchResultsPage == 1)
  351. insertErrorMessage("No search results.");
  352. else
  353. for(var codelet = 0; codelet < result["results"].length; codelet++)
  354. resultDivs.push(createResult(result["results"][codelet]));
  355. results.resolve(resultDivs);
  356. });
  357. return results;
  358. }
  359. /*
  360. * Query the server with the current search string, and populate `div#results`
  361. * with its response.
  362. */
  363. function populateResults(){
  364. searchResultsPage = 1;
  365. loadMoreResults();
  366. }
  367. /*
  368. * Query the server for the next results page, and add its codelets to
  369. * `div#results`.
  370. */
  371. function loadMoreResults(){
  372. queryServer().done(function(results){
  373. for(var result = 0; result < results.length; result++){
  374. var newDiv = results[result];
  375. resultsDiv.appendChild(newDiv);
  376. setTimeout(
  377. (function(divReference){
  378. return function(){
  379. divReference.classList.add("cascade");
  380. };
  381. }(newDiv)),
  382. result * 20);
  383. }
  384. });
  385. }
  386. /*
  387. * Displays a warning message in the UI.
  388. *
  389. * @param msg (str) The message string.
  390. */
  391. function insertErrorMessage(msg){
  392. var error = $(
  393. [
  394. "<div id='error'><span id='s1'>Error</span> ",
  395. "<span id='s2'>&raquo;</span> </div>"
  396. ].join(""));
  397. error.append(msg);
  398. resultsDiv.appendChild(error[0]);
  399. }