git.m6w6.name Git - m6w6/libmemcached/blob - _static/searchtools.js

   1 /*
   2  * searchtools.js
   3  * ~~~~~~~~~~~~~~~~
   4  *
   5  * Sphinx JavaScript utilities for the full-text search.
   6  *
   7  * :copyright: Copyright 2007-2020 by the Sphinx team, see AUTHORS.
   8  * :license: BSD, see LICENSE for details.
   9  *
  10  */
  11
  12 if (!Scorer) {
  13   /**
  14    * Simple result scoring code.
  15    */
  16   var Scorer = {
  17     // Implement the following function to further tweak the score for each result
  18     // The function takes a result array [filename, title, anchor, descr, score]
  19     // and returns the new score.
  20     /*
  21     score: function(result) {
  22       return result[4];
  23     },
  24     */
  25
  26     // query matches the full name of an object
  27     objNameMatch: 11,
  28     // or matches in the last dotted part of the object name
  29     objPartialMatch: 6,
  30     // Additive scores depending on the priority of the object
  31     objPrio: {0:  15,   // used to be importantResults
  32               1:  5,   // used to be objectResults
  33               2: -5},  // used to be unimportantResults
  34     //  Used when the priority is not in the mapping.
  35     objPrioDefault: 0,
  36
  37     // query found in title
  38     title: 15,
  39     partialTitle: 7,
  40     // query found in terms
  41     term: 5,
  42     partialTerm: 2
  43   };
  44 }
  45
  46 if (!splitQuery) {
  47   function splitQuery(query) {
  48     return query.split(/\s+/);
  49   }
  50 }
  51
  52 /**
  53  * Search Module
  54  */
  55 var Search = {
  56
  57   _index : null,
  58   _queued_query : null,
  59   _pulse_status : -1,
  60
  61   htmlToText : function(htmlString) {
  62       var htmlElement = document.createElement('span');
  63       htmlElement.innerHTML = htmlString;
  64       $(htmlElement).find('.headerlink').remove();
  65       docContent = $(htmlElement).find('[role=main]')[0];
  66       if(docContent === undefined) {
  67           console.warn("Content block not found. Sphinx search tries to obtain it " +
  68                        "via '[role=main]'. Could you check your theme or template.");
  69           return "";
  70       }
  71       return docContent.textContent || docContent.innerText;
  72   },
  73
  74   init : function() {
  75       var params = $.getQueryParameters();
  76       if (params.q) {
  77           var query = params.q[0];
  78           $('input[name="q"]')[0].value = query;
  79           this.performSearch(query);
  80       }
  81   },
  82
  83   loadIndex : function(url) {
  84     $.ajax({type: "GET", url: url, data: null,
  85             dataType: "script", cache: true,
  86             complete: function(jqxhr, textstatus) {
  87               if (textstatus != "success") {
  88                 document.getElementById("searchindexloader").src = url;
  89               }
  90             }});
  91   },
  92
  93   setIndex : function(index) {
  94     var q;
  95     this._index = index;
  96     if ((q = this._queued_query) !== null) {
  97       this._queued_query = null;
  98       Search.query(q);
  99     }
 100   },
 101
 102   hasIndex : function() {
 103       return this._index !== null;
 104   },
 105
 106   deferQuery : function(query) {
 107       this._queued_query = query;
 108   },
 109
 110   stopPulse : function() {
 111       this._pulse_status = 0;
 112   },
 113
 114   startPulse : function() {
 115     if (this._pulse_status >= 0)
 116         return;
 117     function pulse() {
 118       var i;
 119       Search._pulse_status = (Search._pulse_status + 1) % 4;
 120       var dotString = '';
 121       for (i = 0; i < Search._pulse_status; i++)
 122         dotString += '.';
 123       Search.dots.text(dotString);
 124       if (Search._pulse_status > -1)
 125         window.setTimeout(pulse, 500);
 126     }
 127     pulse();
 128   },
 129
 130   /**
 131    * perform a search for something (or wait until index is loaded)
 132    */
 133   performSearch : function(query) {
 134     // create the required interface elements
 135     this.out = $('#search-results');
 136     this.title = $('<h2>' + _('Searching') + '</h2>').appendTo(this.out);
 137     this.dots = $('<span></span>').appendTo(this.title);
 138     this.status = $('<p class="search-summary">&nbsp;</p>').appendTo(this.out);
 139     this.output = $('<ul class="search"/>').appendTo(this.out);
 140
 141     $('#search-progress').text(_('Preparing search...'));
 142     this.startPulse();
 143
 144     // index already loaded, the browser was quick!
 145     if (this.hasIndex())
 146       this.query(query);
 147     else
 148       this.deferQuery(query);
 149   },
 150
 151   /**
 152    * execute search (requires search index to be loaded)
 153    */
 154   query : function(query) {
 155     var i;
 156
 157     // stem the searchterms and add them to the correct list
 158     var stemmer = new Stemmer();
 159     var searchterms = [];
 160     var excluded = [];
 161     var hlterms = [];
 162     var tmp = splitQuery(query);
 163     var objectterms = [];
 164     for (i = 0; i < tmp.length; i++) {
 165       if (tmp[i] !== "") {
 166           objectterms.push(tmp[i].toLowerCase());
 167       }
 168
 169       if ($u.indexOf(stopwords, tmp[i].toLowerCase()) != -1 || tmp[i].match(/^\d+$/) ||
 170           tmp[i] === "") {
 171         // skip this "word"
 172         continue;
 173       }
 174       // stem the word
 175       var word = stemmer.stemWord(tmp[i].toLowerCase());
 176       // prevent stemmer from cutting word smaller than two chars
 177       if(word.length < 3 && tmp[i].length >= 3) {
 178         word = tmp[i];
 179       }
 180       var toAppend;
 181       // select the correct list
 182       if (word[0] == '-') {
 183         toAppend = excluded;
 184         word = word.substr(1);
 185       }
 186       else {
 187         toAppend = searchterms;
 188         hlterms.push(tmp[i].toLowerCase());
 189       }
 190       // only add if not already in the list
 191       if (!$u.contains(toAppend, word))
 192         toAppend.push(word);
 193     }
 194     var highlightstring = '?highlight=' + $.urlencode(hlterms.join(" "));
 195
 196     // console.debug('SEARCH: searching for:');
 197     // console.info('required: ', searchterms);
 198     // console.info('excluded: ', excluded);
 199
 200     // prepare search
 201     var terms = this._index.terms;
 202     var titleterms = this._index.titleterms;
 203
 204     // array of [filename, title, anchor, descr, score]
 205     var results = [];
 206     $('#search-progress').empty();
 207
 208     // lookup as object
 209     for (i = 0; i < objectterms.length; i++) {
 210       var others = [].concat(objectterms.slice(0, i),
 211                              objectterms.slice(i+1, objectterms.length));
 212       results = results.concat(this.performObjectSearch(objectterms[i], others));
 213     }
 214
 215     // lookup as search terms in fulltext
 216     results = results.concat(this.performTermsSearch(searchterms, excluded, terms, titleterms));
 217
 218     // let the scorer override scores with a custom scoring function
 219     if (Scorer.score) {
 220       for (i = 0; i < results.length; i++)
 221         results[i][4] = Scorer.score(results[i]);
 222     }
 223
 224     // now sort the results by score (in opposite order of appearance, since the
 225     // display function below uses pop() to retrieve items) and then
 226     // alphabetically
 227     results.sort(function(a, b) {
 228       var left = a[4];
 229       var right = b[4];
 230       if (left > right) {
 231         return 1;
 232       } else if (left < right) {
 233         return -1;
 234       } else {
 235         // same score: sort alphabetically
 236         left = a[1].toLowerCase();
 237         right = b[1].toLowerCase();
 238         return (left > right) ? -1 : ((left < right) ? 1 : 0);
 239       }
 240     });
 241
 242     // for debugging
 243     //Search.lastresults = results.slice();  // a copy
 244     //console.info('search results:', Search.lastresults);
 245
 246     // print the results
 247     var resultCount = results.length;
 248     function displayNextItem() {
 249       // results left, load the summary and display it
 250       if (results.length) {
 251         var item = results.pop();
 252         var listItem = $('<li style="display:none"></li>');
 253         var requestUrl = "";
 254         var linkUrl = "";
 255         if (DOCUMENTATION_OPTIONS.BUILDER === 'dirhtml') {
 256           // dirhtml builder
 257           var dirname = item[0] + '/';
 258           if (dirname.match(/\/index\/$/)) {
 259             dirname = dirname.substring(0, dirname.length-6);
 260           } else if (dirname == 'index/') {
 261             dirname = '';
 262           }
 263           requestUrl = DOCUMENTATION_OPTIONS.URL_ROOT + dirname;
 264           linkUrl = requestUrl;
 265
 266         } else {
 267           // normal html builders
 268           requestUrl = DOCUMENTATION_OPTIONS.URL_ROOT + item[0] + DOCUMENTATION_OPTIONS.FILE_SUFFIX;
 269           linkUrl = item[0] + DOCUMENTATION_OPTIONS.LINK_SUFFIX;
 270         }
 271         listItem.append($('<a/>').attr('href',
 272             linkUrl +
 273             highlightstring + item[2]).html(item[1]));
 274         if (item[3]) {
 275           listItem.append($('<span> (' + item[3] + ')</span>'));
 276           Search.output.append(listItem);
 277           listItem.slideDown(5, function() {
 278             displayNextItem();
 279           });
 280         } else if (DOCUMENTATION_OPTIONS.HAS_SOURCE) {
 281           $.ajax({url: requestUrl,
 282                   dataType: "text",
 283                   complete: function(jqxhr, textstatus) {
 284                     var data = jqxhr.responseText;
 285                     if (data !== '' && data !== undefined) {
 286                       listItem.append(Search.makeSearchSummary(data, searchterms, hlterms));
 287                     }
 288                     Search.output.append(listItem);
 289                     listItem.slideDown(5, function() {
 290                       displayNextItem();
 291                     });
 292                   }});
 293         } else {
 294           // no source available, just display title
 295           Search.output.append(listItem);
 296           listItem.slideDown(5, function() {
 297             displayNextItem();
 298           });
 299         }
 300       }
 301       // search finished, update title and status message
 302       else {
 303         Search.stopPulse();
 304         Search.title.text(_('Search Results'));
 305         if (!resultCount)
 306           Search.status.text(_('Your search did not match any documents. Please make sure that all words are spelled correctly and that you\'ve selected enough categories.'));
 307         else
 308             Search.status.text(_('Search finished, found %s page(s) matching the search query.').replace('%s', resultCount));
 309         Search.status.fadeIn(500);
 310       }
 311     }
 312     displayNextItem();
 313   },
 314
 315   /**
 316    * search for object names
 317    */
 318   performObjectSearch : function(object, otherterms) {
 319     var filenames = this._index.filenames;
 320     var docnames = this._index.docnames;
 321     var objects = this._index.objects;
 322     var objnames = this._index.objnames;
 323     var titles = this._index.titles;
 324
 325     var i;
 326     var results = [];
 327
 328     for (var prefix in objects) {
 329       for (var name in objects[prefix]) {
 330         var fullname = (prefix ? prefix + '.' : '') + name;
 331         var fullnameLower = fullname.toLowerCase()
 332         if (fullnameLower.indexOf(object) > -1) {
 333           var score = 0;
 334           var parts = fullnameLower.split('.');
 335           // check for different match types: exact matches of full name or
 336           // "last name" (i.e. last dotted part)
 337           if (fullnameLower == object || parts[parts.length - 1] == object) {
 338             score += Scorer.objNameMatch;
 339           // matches in last name
 340           } else if (parts[parts.length - 1].indexOf(object) > -1) {
 341             score += Scorer.objPartialMatch;
 342           }
 343           var match = objects[prefix][name];
 344           var objname = objnames[match[1]][2];
 345           var title = titles[match[0]];
 346           // If more than one term searched for, we require other words to be
 347           // found in the name/title/description
 348           if (otherterms.length > 0) {
 349             var haystack = (prefix + ' ' + name + ' ' +
 350                             objname + ' ' + title).toLowerCase();
 351             var allfound = true;
 352             for (i = 0; i < otherterms.length; i++) {
 353               if (haystack.indexOf(otherterms[i]) == -1) {
 354                 allfound = false;
 355                 break;
 356               }
 357             }
 358             if (!allfound) {
 359               continue;
 360             }
 361           }
 362           var descr = objname + _(', in ') + title;
 363
 364           var anchor = match[3];
 365           if (anchor === '')
 366             anchor = fullname;
 367           else if (anchor == '-')
 368             anchor = objnames[match[1]][1] + '-' + fullname;
 369           // add custom score for some objects according to scorer
 370           if (Scorer.objPrio.hasOwnProperty(match[2])) {
 371             score += Scorer.objPrio[match[2]];
 372           } else {
 373             score += Scorer.objPrioDefault;
 374           }
 375           results.push([docnames[match[0]], fullname, '#'+anchor, descr, score, filenames[match[0]]]);
 376         }
 377       }
 378     }
 379
 380     return results;
 381   },
 382
 383   /**
 384    * search for full-text terms in the index
 385    */
 386   performTermsSearch : function(searchterms, excluded, terms, titleterms) {
 387     var docnames = this._index.docnames;
 388     var filenames = this._index.filenames;
 389     var titles = this._index.titles;
 390
 391     var i, j, file;
 392     var fileMap = {};
 393     var scoreMap = {};
 394     var results = [];
 395
 396     // perform the search on the required terms
 397     for (i = 0; i < searchterms.length; i++) {
 398       var word = searchterms[i];
 399       var files = [];
 400       var _o = [
 401         {files: terms[word], score: Scorer.term},
 402         {files: titleterms[word], score: Scorer.title}
 403       ];
 404       // add support for partial matches
 405       if (word.length > 2) {
 406         for (var w in terms) {
 407           if (w.match(word) && !terms[word]) {
 408             _o.push({files: terms[w], score: Scorer.partialTerm})
 409           }
 410         }
 411         for (var w in titleterms) {
 412           if (w.match(word) && !titleterms[word]) {
 413               _o.push({files: titleterms[w], score: Scorer.partialTitle})
 414           }
 415         }
 416       }
 417
 418       // no match but word was a required one
 419       if ($u.every(_o, function(o){return o.files === undefined;})) {
 420         break;
 421       }
 422       // found search word in contents
 423       $u.each(_o, function(o) {
 424         var _files = o.files;
 425         if (_files === undefined)
 426           return
 427
 428         if (_files.length === undefined)
 429           _files = [_files];
 430         files = files.concat(_files);
 431
 432         // set score for the word in each file to Scorer.term
 433         for (j = 0; j < _files.length; j++) {
 434           file = _files[j];
 435           if (!(file in scoreMap))
 436             scoreMap[file] = {};
 437           scoreMap[file][word] = o.score;
 438         }
 439       });
 440
 441       // create the mapping
 442       for (j = 0; j < files.length; j++) {
 443         file = files[j];
 444         if (file in fileMap && fileMap[file].indexOf(word) === -1)
 445           fileMap[file].push(word);
 446         else
 447           fileMap[file] = [word];
 448       }
 449     }
 450
 451     // now check if the files don't contain excluded terms
 452     for (file in fileMap) {
 453       var valid = true;
 454
 455       // check if all requirements are matched
 456       var filteredTermCount = // as search terms with length < 3 are discarded: ignore
 457         searchterms.filter(function(term){return term.length > 2}).length
 458       if (
 459         fileMap[file].length != searchterms.length &&
 460         fileMap[file].length != filteredTermCount
 461       ) continue;
 462
 463       // ensure that none of the excluded terms is in the search result
 464       for (i = 0; i < excluded.length; i++) {
 465         if (terms[excluded[i]] == file ||
 466             titleterms[excluded[i]] == file ||
 467             $u.contains(terms[excluded[i]] || [], file) ||
 468             $u.contains(titleterms[excluded[i]] || [], file)) {
 469           valid = false;
 470           break;
 471         }
 472       }
 473
 474       // if we have still a valid result we can add it to the result list
 475       if (valid) {
 476         // select one (max) score for the file.
 477         // for better ranking, we should calculate ranking by using words statistics like basic tf-idf...
 478         var score = $u.max($u.map(fileMap[file], function(w){return scoreMap[file][w]}));
 479         results.push([docnames[file], titles[file], '', null, score, filenames[file]]);
 480       }
 481     }
 482     return results;
 483   },
 484
 485   /**
 486    * helper function to return a node containing the
 487    * search summary for a given text. keywords is a list
 488    * of stemmed words, hlwords is the list of normal, unstemmed
 489    * words. the first one is used to find the occurrence, the
 490    * latter for highlighting it.
 491    */
 492   makeSearchSummary : function(htmlText, keywords, hlwords) {
 493     var text = Search.htmlToText(htmlText);
 494     var textLower = text.toLowerCase();
 495     var start = 0;
 496     $.each(keywords, function() {
 497       var i = textLower.indexOf(this.toLowerCase());
 498       if (i > -1)
 499         start = i;
 500     });
 501     start = Math.max(start - 120, 0);
 502     var excerpt = ((start > 0) ? '...' : '') +
 503       $.trim(text.substr(start, 240)) +
 504       ((start + 240 - text.length) ? '...' : '');
 505     var rv = $('<div class="context"></div>').text(excerpt);
 506     $.each(hlwords, function() {
 507       rv = rv.highlightText(this, 'highlighted');
 508     });
 509     return rv;
 510   }
 511 };
 512
 513 $(document).ready(function() {
 514   Search.init();
 515 });