source: ammosreader/doc/html/_static/searchtools.js@ ada37fa

AmmosSource guix
Last change on this file since ada37fa was ada37fa, checked in by Enrico Schwass <ennoausberlin@…>, 3 years ago

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1/*
2 * searchtools.js
3 * ~~~~~~~~~~~~~~~~
4 *
5 * Sphinx JavaScript utilities for the full-text search.
6 *
7 * :copyright: Copyright 2007-2021 by the Sphinx team, see AUTHORS.
8 * :license: BSD, see LICENSE for details.
9 *
10 */
11
12if (!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
46if (!splitQuery) {
47 function splitQuery(query) {
48 return query.split(/\s+/);
49 }
50}
51
52/**
53 * Search Module
54 */
55var Search = {
56
57 _index : null,
58 _queued_query : null,
59 _pulse_status : -1,
60
61 htmlToText : function(htmlString) {
62 var virtualDocument = document.implementation.createHTMLDocument('virtual');
63 var htmlElement = $(htmlString, virtualDocument);
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] === "") {
170 // skip this "word"
171 continue;
172 }
173 // stem the word
174 var word = stemmer.stemWord(tmp[i].toLowerCase());
175 // prevent stemmer from cutting word smaller than two chars
176 if(word.length < 3 && tmp[i].length >= 3) {
177 word = tmp[i];
178 }
179 var toAppend;
180 // select the correct list
181 if (word[0] == '-') {
182 toAppend = excluded;
183 word = word.substr(1);
184 }
185 else {
186 toAppend = searchterms;
187 hlterms.push(tmp[i].toLowerCase());
188 }
189 // only add if not already in the list
190 if (!$u.contains(toAppend, word))
191 toAppend.push(word);
192 }
193 var highlightstring = '?highlight=' + $.urlencode(hlterms.join(" "));
194
195 // console.debug('SEARCH: searching for:');
196 // console.info('required: ', searchterms);
197 // console.info('excluded: ', excluded);
198
199 // prepare search
200 var terms = this._index.terms;
201 var titleterms = this._index.titleterms;
202
203 // array of [filename, title, anchor, descr, score]
204 var results = [];
205 $('#search-progress').empty();
206
207 // lookup as object
208 for (i = 0; i < objectterms.length; i++) {
209 var others = [].concat(objectterms.slice(0, i),
210 objectterms.slice(i+1, objectterms.length));
211 results = results.concat(this.performObjectSearch(objectterms[i], others));
212 }
213
214 // lookup as search terms in fulltext
215 results = results.concat(this.performTermsSearch(searchterms, excluded, terms, titleterms));
216
217 // let the scorer override scores with a custom scoring function
218 if (Scorer.score) {
219 for (i = 0; i < results.length; i++)
220 results[i][4] = Scorer.score(results[i]);
221 }
222
223 // now sort the results by score (in opposite order of appearance, since the
224 // display function below uses pop() to retrieve items) and then
225 // alphabetically
226 results.sort(function(a, b) {
227 var left = a[4];
228 var right = b[4];
229 if (left > right) {
230 return 1;
231 } else if (left < right) {
232 return -1;
233 } else {
234 // same score: sort alphabetically
235 left = a[1].toLowerCase();
236 right = b[1].toLowerCase();
237 return (left > right) ? -1 : ((left < right) ? 1 : 0);
238 }
239 });
240
241 // for debugging
242 //Search.lastresults = results.slice(); // a copy
243 //console.info('search results:', Search.lastresults);
244
245 // print the results
246 var resultCount = results.length;
247 function displayNextItem() {
248 // results left, load the summary and display it
249 if (results.length) {
250 var item = results.pop();
251 var listItem = $('<li></li>');
252 var requestUrl = "";
253 var linkUrl = "";
254 if (DOCUMENTATION_OPTIONS.BUILDER === 'dirhtml') {
255 // dirhtml builder
256 var dirname = item[0] + '/';
257 if (dirname.match(/\/index\/$/)) {
258 dirname = dirname.substring(0, dirname.length-6);
259 } else if (dirname == 'index/') {
260 dirname = '';
261 }
262 requestUrl = DOCUMENTATION_OPTIONS.URL_ROOT + dirname;
263 linkUrl = requestUrl;
264
265 } else {
266 // normal html builders
267 requestUrl = DOCUMENTATION_OPTIONS.URL_ROOT + item[0] + DOCUMENTATION_OPTIONS.FILE_SUFFIX;
268 linkUrl = item[0] + DOCUMENTATION_OPTIONS.LINK_SUFFIX;
269 }
270 listItem.append($('<a/>').attr('href',
271 linkUrl +
272 highlightstring + item[2]).html(item[1]));
273 if (item[3]) {
274 listItem.append($('<span> (' + item[3] + ')</span>'));
275 Search.output.append(listItem);
276 setTimeout(function() {
277 displayNextItem();
278 }, 5);
279 } else if (DOCUMENTATION_OPTIONS.HAS_SOURCE) {
280 $.ajax({url: requestUrl,
281 dataType: "text",
282 complete: function(jqxhr, textstatus) {
283 var data = jqxhr.responseText;
284 if (data !== '' && data !== undefined) {
285 var summary = Search.makeSearchSummary(data, searchterms, hlterms);
286 if (summary) {
287 listItem.append(summary);
288 }
289 }
290 Search.output.append(listItem);
291 setTimeout(function() {
292 displayNextItem();
293 }, 5);
294 }});
295 } else {
296 // no source available, just display title
297 Search.output.append(listItem);
298 setTimeout(function() {
299 displayNextItem();
300 }, 5);
301 }
302 }
303 // search finished, update title and status message
304 else {
305 Search.stopPulse();
306 Search.title.text(_('Search Results'));
307 if (!resultCount)
308 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.'));
309 else
310 Search.status.text(_('Search finished, found %s page(s) matching the search query.').replace('%s', resultCount));
311 Search.status.fadeIn(500);
312 }
313 }
314 displayNextItem();
315 },
316
317 /**
318 * search for object names
319 */
320 performObjectSearch : function(object, otherterms) {
321 var filenames = this._index.filenames;
322 var docnames = this._index.docnames;
323 var objects = this._index.objects;
324 var objnames = this._index.objnames;
325 var titles = this._index.titles;
326
327 var i;
328 var results = [];
329
330 for (var prefix in objects) {
331 for (var name in objects[prefix]) {
332 var fullname = (prefix ? prefix + '.' : '') + name;
333 var fullnameLower = fullname.toLowerCase()
334 if (fullnameLower.indexOf(object) > -1) {
335 var score = 0;
336 var parts = fullnameLower.split('.');
337 // check for different match types: exact matches of full name or
338 // "last name" (i.e. last dotted part)
339 if (fullnameLower == object || parts[parts.length - 1] == object) {
340 score += Scorer.objNameMatch;
341 // matches in last name
342 } else if (parts[parts.length - 1].indexOf(object) > -1) {
343 score += Scorer.objPartialMatch;
344 }
345 var match = objects[prefix][name];
346 var objname = objnames[match[1]][2];
347 var title = titles[match[0]];
348 // If more than one term searched for, we require other words to be
349 // found in the name/title/description
350 if (otherterms.length > 0) {
351 var haystack = (prefix + ' ' + name + ' ' +
352 objname + ' ' + title).toLowerCase();
353 var allfound = true;
354 for (i = 0; i < otherterms.length; i++) {
355 if (haystack.indexOf(otherterms[i]) == -1) {
356 allfound = false;
357 break;
358 }
359 }
360 if (!allfound) {
361 continue;
362 }
363 }
364 var descr = objname + _(', in ') + title;
365
366 var anchor = match[3];
367 if (anchor === '')
368 anchor = fullname;
369 else if (anchor == '-')
370 anchor = objnames[match[1]][1] + '-' + fullname;
371 // add custom score for some objects according to scorer
372 if (Scorer.objPrio.hasOwnProperty(match[2])) {
373 score += Scorer.objPrio[match[2]];
374 } else {
375 score += Scorer.objPrioDefault;
376 }
377 results.push([docnames[match[0]], fullname, '#'+anchor, descr, score, filenames[match[0]]]);
378 }
379 }
380 }
381
382 return results;
383 },
384
385 /**
386 * See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
387 */
388 escapeRegExp : function(string) {
389 return string.replace(/[.*+\-?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
390 },
391
392 /**
393 * search for full-text terms in the index
394 */
395 performTermsSearch : function(searchterms, excluded, terms, titleterms) {
396 var docnames = this._index.docnames;
397 var filenames = this._index.filenames;
398 var titles = this._index.titles;
399
400 var i, j, file;
401 var fileMap = {};
402 var scoreMap = {};
403 var results = [];
404
405 // perform the search on the required terms
406 for (i = 0; i < searchterms.length; i++) {
407 var word = searchterms[i];
408 var files = [];
409 var _o = [
410 {files: terms[word], score: Scorer.term},
411 {files: titleterms[word], score: Scorer.title}
412 ];
413 // add support for partial matches
414 if (word.length > 2) {
415 var word_regex = this.escapeRegExp(word);
416 for (var w in terms) {
417 if (w.match(word_regex) && !terms[word]) {
418 _o.push({files: terms[w], score: Scorer.partialTerm})
419 }
420 }
421 for (var w in titleterms) {
422 if (w.match(word_regex) && !titleterms[word]) {
423 _o.push({files: titleterms[w], score: Scorer.partialTitle})
424 }
425 }
426 }
427
428 // no match but word was a required one
429 if ($u.every(_o, function(o){return o.files === undefined;})) {
430 break;
431 }
432 // found search word in contents
433 $u.each(_o, function(o) {
434 var _files = o.files;
435 if (_files === undefined)
436 return
437
438 if (_files.length === undefined)
439 _files = [_files];
440 files = files.concat(_files);
441
442 // set score for the word in each file to Scorer.term
443 for (j = 0; j < _files.length; j++) {
444 file = _files[j];
445 if (!(file in scoreMap))
446 scoreMap[file] = {};
447 scoreMap[file][word] = o.score;
448 }
449 });
450
451 // create the mapping
452 for (j = 0; j < files.length; j++) {
453 file = files[j];
454 if (file in fileMap && fileMap[file].indexOf(word) === -1)
455 fileMap[file].push(word);
456 else
457 fileMap[file] = [word];
458 }
459 }
460
461 // now check if the files don't contain excluded terms
462 for (file in fileMap) {
463 var valid = true;
464
465 // check if all requirements are matched
466 var filteredTermCount = // as search terms with length < 3 are discarded: ignore
467 searchterms.filter(function(term){return term.length > 2}).length
468 if (
469 fileMap[file].length != searchterms.length &&
470 fileMap[file].length != filteredTermCount
471 ) continue;
472
473 // ensure that none of the excluded terms is in the search result
474 for (i = 0; i < excluded.length; i++) {
475 if (terms[excluded[i]] == file ||
476 titleterms[excluded[i]] == file ||
477 $u.contains(terms[excluded[i]] || [], file) ||
478 $u.contains(titleterms[excluded[i]] || [], file)) {
479 valid = false;
480 break;
481 }
482 }
483
484 // if we have still a valid result we can add it to the result list
485 if (valid) {
486 // select one (max) score for the file.
487 // for better ranking, we should calculate ranking by using words statistics like basic tf-idf...
488 var score = $u.max($u.map(fileMap[file], function(w){return scoreMap[file][w]}));
489 results.push([docnames[file], titles[file], '', null, score, filenames[file]]);
490 }
491 }
492 return results;
493 },
494
495 /**
496 * helper function to return a node containing the
497 * search summary for a given text. keywords is a list
498 * of stemmed words, hlwords is the list of normal, unstemmed
499 * words. the first one is used to find the occurrence, the
500 * latter for highlighting it.
501 */
502 makeSearchSummary : function(htmlText, keywords, hlwords) {
503 var text = Search.htmlToText(htmlText);
504 if (text == "") {
505 return null;
506 }
507 var textLower = text.toLowerCase();
508 var start = 0;
509 $.each(keywords, function() {
510 var i = textLower.indexOf(this.toLowerCase());
511 if (i > -1)
512 start = i;
513 });
514 start = Math.max(start - 120, 0);
515 var excerpt = ((start > 0) ? '...' : '') +
516 $.trim(text.substr(start, 240)) +
517 ((start + 240 - text.length) ? '...' : '');
518 var rv = $('<p class="context"></p>').text(excerpt);
519 $.each(hlwords, function() {
520 rv = rv.highlightText(this, 'highlighted');
521 });
522 return rv;
523 }
524};
525
526$(document).ready(function() {
527 Search.init();
528});
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