5 * Created on July 30, 2007
7 * Copyright © 2007 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
22 * http://www.gnu.org/copyleft/gpl.html
28 * Query module to perform full text search within wiki titles and content
32 class ApiQuerySearch
extends ApiQueryGeneratorBase
{
35 * When $wgSearchType is null, $wgSearchAlternatives[0] is null. Null isn't
36 * a valid option for an array for PARAM_TYPE, so we'll use a fake name
37 * that can't possibly be a class name and describes what the null behavior
40 const BACKEND_NULL_PARAM
= 'database-backed';
42 public function __construct( ApiQuery
$query, $moduleName ) {
43 parent
::__construct( $query, $moduleName, 'sr' );
46 public function execute() {
50 public function executeGenerator( $resultPageSet ) {
51 $this->run( $resultPageSet );
55 * @param ApiPageSet $resultPageSet
58 private function run( $resultPageSet = null ) {
60 $params = $this->extractRequestParams();
63 $limit = $params['limit'];
64 $query = $params['search'];
65 $what = $params['what'];
66 $interwiki = $params['interwiki'];
67 $searchInfo = array_flip( $params['info'] );
68 $prop = array_flip( $params['prop'] );
70 // Create search engine instance and set options
71 $search = isset( $params['backend'] ) && $params['backend'] != self
::BACKEND_NULL_PARAM ?
72 SearchEngine
::create( $params['backend'] ) : SearchEngine
::create();
73 $search->setLimitOffset( $limit +
1, $params['offset'] );
74 $search->setNamespaces( $params['namespace'] );
76 $query = $search->transformSearchTerm( $query );
77 $query = $search->replacePrefixes( $query );
79 // Perform the actual search
80 if ( $what == 'text' ) {
81 $matches = $search->searchText( $query );
82 } elseif ( $what == 'title' ) {
83 $matches = $search->searchTitle( $query );
84 } elseif ( $what == 'nearmatch' ) {
85 $matches = SearchEngine
::getNearMatchResultSet( $query );
87 // We default to title searches; this is a terrible legacy
88 // of the way we initially set up the MySQL fulltext-based
89 // search engine with separate title and text fields.
90 // In the future, the default should be for a combined index.
92 $matches = $search->searchTitle( $query );
94 // Not all search engines support a separate title search,
95 // for instance the Lucene-based engine we use on Wikipedia.
96 // In this case, fall back to full-text search (which will
97 // include titles in it!)
98 if ( is_null( $matches ) ) {
100 $matches = $search->searchText( $query );
103 if ( is_null( $matches ) ) {
104 $this->dieUsage( "{$what} search is disabled", "search-{$what}-disabled" );
105 } elseif ( $matches instanceof Status
&& !$matches->isGood() ) {
106 $this->dieUsage( $matches->getWikiText(), 'search-error' );
109 $apiResult = $this->getResult();
110 // Add search meta data to result
111 if ( isset( $searchInfo['totalhits'] ) ) {
112 $totalhits = $matches->getTotalHits();
113 if ( $totalhits !== null ) {
114 $apiResult->addValue( array( 'query', 'searchinfo' ),
115 'totalhits', $totalhits );
118 if ( isset( $searchInfo['suggestion'] ) && $matches->hasSuggestion() ) {
119 $apiResult->addValue( array( 'query', 'searchinfo' ),
120 'suggestion', $matches->getSuggestionQuery() );
123 // Add the search results to the result
124 $terms = $wgContLang->convertForSearchResult( $matches->termMatches() );
127 $result = $matches->next();
130 if ( ++
$count > $limit ) {
131 // We've reached the one extra which shows that there are
132 // additional items to be had. Stop here...
133 $this->setContinueEnumParameter( 'offset', $params['offset'] +
$params['limit'] );
137 // Silently skip broken and missing titles
138 if ( $result->isBrokenTitle() ||
$result->isMissingRevision() ) {
139 $result = $matches->next();
143 $title = $result->getTitle();
144 if ( is_null( $resultPageSet ) ) {
146 ApiQueryBase
::addTitleInfo( $vals, $title );
148 if ( isset( $prop['snippet'] ) ) {
149 $vals['snippet'] = $result->getTextSnippet( $terms );
151 if ( isset( $prop['size'] ) ) {
152 $vals['size'] = $result->getByteSize();
154 if ( isset( $prop['wordcount'] ) ) {
155 $vals['wordcount'] = $result->getWordCount();
157 if ( isset( $prop['timestamp'] ) ) {
158 $vals['timestamp'] = wfTimestamp( TS_ISO_8601
, $result->getTimestamp() );
160 if ( !is_null( $result->getScore() ) && isset( $prop['score'] ) ) {
161 $vals['score'] = $result->getScore();
163 if ( isset( $prop['titlesnippet'] ) ) {
164 $vals['titlesnippet'] = $result->getTitleSnippet( $terms );
166 if ( !is_null( $result->getRedirectTitle() ) ) {
167 if ( isset( $prop['redirecttitle'] ) ) {
168 $vals['redirecttitle'] = $result->getRedirectTitle();
170 if ( isset( $prop['redirectsnippet'] ) ) {
171 $vals['redirectsnippet'] = $result->getRedirectSnippet( $terms );
174 if ( !is_null( $result->getSectionTitle() ) ) {
175 if ( isset( $prop['sectiontitle'] ) ) {
176 $vals['sectiontitle'] = $result->getSectionTitle()->getFragment();
178 if ( isset( $prop['sectionsnippet'] ) ) {
179 $vals['sectionsnippet'] = $result->getSectionSnippet();
182 if ( isset( $prop['hasrelated'] ) && $result->hasRelated() ) {
183 $vals['hasrelated'] = '';
186 // Add item to results and see whether it fits
187 $fit = $apiResult->addValue( array( 'query', $this->getModuleName() ),
190 $this->setContinueEnumParameter( 'offset', $params['offset'] +
$count - 1 );
197 $result = $matches->next();
200 $hasInterwikiResults = false;
201 if ( $interwiki && $resultPageSet === null && $matches->hasInterwikiResults() ) {
202 $matches = $matches->getInterwikiResults();
203 $iwprefixes = array();
204 $hasInterwikiResults = true;
206 // Include number of results if requested
207 if ( isset( $searchInfo['totalhits'] ) ) {
208 $totalhits = $matches->getTotalHits();
209 if ( $totalhits !== null ) {
210 $apiResult->addValue( array( 'query', 'interwikisearchinfo' ),
211 'totalhits', $totalhits );
215 $result = $matches->next();
217 $title = $result->getTitle();
219 'namespace' => $result->getInterwikiNamespaceText(),
220 'title' => $title->getText(),
221 'url' => $title->getFullUrl(),
224 // Add item to results and see whether it fits
225 $fit = $apiResult->addValue(
226 array( 'query', 'interwiki' . $this->getModuleName(), $result->getInterwikiPrefix() ),
232 // We hit the limit. We can't really provide any meaningful
233 // pagination info so just bail out
237 $result = $matches->next();
241 if ( is_null( $resultPageSet ) ) {
242 $apiResult->setIndexedTagName_internal( array(
243 'query', $this->getModuleName()
245 if ( $hasInterwikiResults ) {
246 $apiResult->setIndexedTagName_internal( array(
247 'query', 'interwiki' . $this->getModuleName()
251 $resultPageSet->populateFromTitles( $titles );
255 public function getCacheMode( $params ) {
259 public function getAllowedParams() {
260 global $wgSearchType;
264 ApiBase
::PARAM_TYPE
=> 'string',
265 ApiBase
::PARAM_REQUIRED
=> true
267 'namespace' => array(
268 ApiBase
::PARAM_DFLT
=> NS_MAIN
,
269 ApiBase
::PARAM_TYPE
=> 'namespace',
270 ApiBase
::PARAM_ISMULTI
=> true,
273 ApiBase
::PARAM_DFLT
=> null,
274 ApiBase
::PARAM_TYPE
=> array(
281 ApiBase
::PARAM_DFLT
=> 'totalhits|suggestion',
282 ApiBase
::PARAM_TYPE
=> array(
286 ApiBase
::PARAM_ISMULTI
=> true,
289 ApiBase
::PARAM_DFLT
=> 'size|wordcount|timestamp|snippet',
290 ApiBase
::PARAM_TYPE
=> array(
303 ApiBase
::PARAM_ISMULTI
=> true,
307 ApiBase
::PARAM_DFLT
=> 10,
308 ApiBase
::PARAM_TYPE
=> 'limit',
309 ApiBase
::PARAM_MIN
=> 1,
310 ApiBase
::PARAM_MAX
=> ApiBase
::LIMIT_SML1
,
311 ApiBase
::PARAM_MAX2
=> ApiBase
::LIMIT_SML2
313 'interwiki' => false,
316 $alternatives = SearchEngine
::getSearchTypes();
317 if ( count( $alternatives ) > 1 ) {
318 if ( $alternatives[0] === null ) {
319 $alternatives[0] = self
::BACKEND_NULL_PARAM
;
321 $params['backend'] = array(
322 ApiBase
::PARAM_DFLT
=> $wgSearchType,
323 ApiBase
::PARAM_TYPE
=> $alternatives,
330 public function getParamDescription() {
331 $descriptions = array(
332 'search' => 'Search for all page titles (or content) that has this value',
333 'namespace' => 'The namespace(s) to enumerate',
334 'what' => 'Search inside the text or titles',
335 'info' => 'What metadata to return',
337 'What properties to return',
338 ' size - Adds the size of the page in bytes',
339 ' wordcount - Adds the word count of the page',
340 ' timestamp - Adds the timestamp of when the page was last edited',
341 ' score - Adds the score (if any) from the search engine',
342 ' snippet - Adds a parsed snippet of the page',
343 ' titlesnippet - Adds a parsed snippet of the page title',
344 ' redirectsnippet - Adds a parsed snippet of the redirect title',
345 ' redirecttitle - Adds the title of the matching redirect',
346 ' sectionsnippet - Adds a parsed snippet of the matching section title',
347 ' sectiontitle - Adds the title of the matching section',
348 ' hasrelated - Indicates whether a related search is available',
350 'offset' => 'Use this value to continue paging (return by query)',
351 'limit' => 'How many total pages to return',
352 'interwiki' => 'Include interwiki results in the search, if available'
355 if ( count( SearchEngine
::getSearchTypes() ) > 1 ) {
356 $descriptions['backend'] = 'Which search backend to use, if not the default';
359 return $descriptions;
362 public function getResultProperties() {
369 'snippet' => 'string'
374 'wordcount' => array(
375 'wordcount' => 'integer'
377 'timestamp' => array(
378 'timestamp' => 'timestamp'
382 ApiBase
::PROP_TYPE
=> 'string',
383 ApiBase
::PROP_NULLABLE
=> true
386 'titlesnippet' => array(
387 'titlesnippet' => 'string'
389 'redirecttitle' => array(
390 'redirecttitle' => array(
391 ApiBase
::PROP_TYPE
=> 'string',
392 ApiBase
::PROP_NULLABLE
=> true
395 'redirectsnippet' => array(
396 'redirectsnippet' => array(
397 ApiBase
::PROP_TYPE
=> 'string',
398 ApiBase
::PROP_NULLABLE
=> true
401 'sectiontitle' => array(
402 'sectiontitle' => array(
403 ApiBase
::PROP_TYPE
=> 'string',
404 ApiBase
::PROP_NULLABLE
=> true
407 'sectionsnippet' => array(
408 'sectionsnippet' => array(
409 ApiBase
::PROP_TYPE
=> 'string',
410 ApiBase
::PROP_NULLABLE
=> true
413 'hasrelated' => array(
414 'hasrelated' => 'boolean'
419 public function getDescription() {
420 return 'Perform a full text search.';
423 public function getPossibleErrors() {
424 return array_merge( parent
::getPossibleErrors(), array(
425 array( 'code' => 'search-text-disabled', 'info' => 'text search is disabled' ),
426 array( 'code' => 'search-title-disabled', 'info' => 'title search is disabled' ),
427 array( 'code' => 'search-error', 'info' => 'search error has occurred' ),
431 public function getExamples() {
433 'api.php?action=query&list=search&srsearch=meaning',
434 'api.php?action=query&list=search&srwhat=text&srsearch=meaning',
435 'api.php?action=query&generator=search&gsrsearch=meaning&prop=info',
439 public function getHelpUrls() {
440 return 'https://www.mediawiki.org/wiki/API:Search';