includes/api/ApiQuerySearch.php

   1 <?php
   2
   3 /*
   4  * Created on July 30, 2007
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright (C) 2007 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  */
  25
  26 if (!defined('MEDIAWIKI')) {
  27         // Eclipse helper - will be ignored in production
  28         require_once ('ApiQueryBase.php');
  29 }
  30
  31 /**
  32  * Query module to perform full text search within wiki titles and content
  33  *
  34  * @ingroup API
  35  */
  36 class ApiQuerySearch extends ApiQueryGeneratorBase {
  37
  38         public function __construct($query, $moduleName) {
  39                 parent :: __construct($query, $moduleName, 'sr');
  40         }
  41
  42         public function execute() {
  43                 $this->run();
  44         }
  45
  46         public function executeGenerator($resultPageSet) {
  47                 $this->run($resultPageSet);
  48         }
  49
  50         private function run($resultPageSet = null) {
  51
  52                 $params = $this->extractRequestParams();
  53
  54                 $limit = $params['limit'];
  55                 $query = $params['search'];
  56                 $what = $params['what'];
  57                 if (strval($query) === '')
  58                         $this->dieUsage("empty search string is not allowed", 'param-search');
  59
  60                 $search = SearchEngine::create();
  61                 $search->setLimitOffset( $limit+1, $params['offset'] );
  62                 $search->setNamespaces( $params['namespace'] );
  63                 $search->showRedirects = $params['redirects'];
  64
  65                 if ($what == 'text') {
  66                         $matches = $search->searchText( $query );
  67                 } elseif( $what == 'title' ) {
  68                         $matches = $search->searchTitle( $query );
  69                 } else {
  70                         // We default to title searches; this is a terrible legacy
  71                         // of the way we initially set up the MySQL fulltext-based
  72                         // search engine with separate title and text fields.
  73                         // In the future, the default should be for a combined index.
  74                         $what = 'title';
  75                         $matches = $search->searchTitle( $query );
  76
  77                         // Not all search engines support a separate title search,
  78                         // for instance the Lucene-based engine we use on Wikipedia.
  79                         // In this case, fall back to full-text search (which will
  80                         // include titles in it!)
  81                         if( is_null( $matches ) ) {
  82                                 $what = 'text';
  83                                 $matches = $search->searchText( $query );
  84                         }
  85                 }
  86                 if (is_null($matches))
  87                         $this->dieUsage("{$what} search is disabled",
  88                                         "search-{$what}-disabled");
  89
  90                 $titles = array ();
  91                 $count = 0;
  92                 while( $result = $matches->next() ) {
  93                         if (++ $count > $limit) {
  94                                 // We've reached the one extra which shows that there are additional items to be had. Stop here...
  95                                 $this->setContinueEnumParameter('offset', $params['offset'] + $params['limit']);
  96                                 break;
  97                         }
  98
  99                         // Silently skip broken and missing titles
 100                         if ($result->isBrokenTitle() || $result->isMissingRevision())
 101                                 continue;
 102
 103                         $title = $result->getTitle();
 104                         if (is_null($resultPageSet)) {
 105                                 $vals = array();
 106                                 ApiQueryBase::addTitleInfo($vals, $title);
 107                                 $fit = $this->getResult()->addValue(array('query', $this->getModuleName()), null, $vals);
 108                                 if(!$fit)
 109                                 {
 110                                         $this->setContinueEnumParameter('offset', $params['offset'] + $count - 1);
 111                                         break;
 112                                 }
 113                         } else {
 114                                 $titles[] = $title;
 115                         }
 116                 }
 117
 118                 if (is_null($resultPageSet)) {
 119                         $this->getResult()->setIndexedTagName_internal(array('query', $this->getModuleName()), 'p');
 120                 } else {
 121                         $resultPageSet->populateFromTitles($titles);
 122                 }
 123         }
 124
 125         public function getAllowedParams() {
 126                 return array (
 127                         'search' => null,
 128                         'namespace' => array (
 129                                 ApiBase :: PARAM_DFLT => 0,
 130                                 ApiBase :: PARAM_TYPE => 'namespace',
 131                                 ApiBase :: PARAM_ISMULTI => true,
 132                         ),
 133                         'what' => array (
 134                                 ApiBase :: PARAM_DFLT => null,
 135                                 ApiBase :: PARAM_TYPE => array (
 136                                         'title',
 137                                         'text',
 138                                 )
 139                         ),
 140                         'redirects' => false,
 141                         'offset' => 0,
 142                         'limit' => array (
 143                                 ApiBase :: PARAM_DFLT => 10,
 144                                 ApiBase :: PARAM_TYPE => 'limit',
 145                                 ApiBase :: PARAM_MIN => 1,
 146                                 ApiBase :: PARAM_MAX => ApiBase :: LIMIT_BIG1,
 147                                 ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_BIG2
 148                         )
 149                 );
 150         }
 151
 152         public function getParamDescription() {
 153                 return array (
 154                         'search' => 'Search for all page titles (or content) that has this value.',
 155                         'namespace' => 'The namespace(s) to enumerate.',
 156                         'what' => 'Search inside the text or titles.',
 157                         'redirects' => 'Include redirect pages in the search.',
 158                         'offset' => 'Use this value to continue paging (return by query)',
 159                         'limit' => 'How many total pages to return.'
 160                 );
 161         }
 162
 163         public function getDescription() {
 164                 return 'Perform a full text search';
 165         }
 166
 167         protected function getExamples() {
 168                 return array (
 169                         'api.php?action=query&list=search&srsearch=meaning',
 170                         'api.php?action=query&list=search&srwhat=text&srsearch=meaning',
 171                         'api.php?action=query&generator=search&gsrsearch=meaning&prop=info',
 172                 );
 173         }
 174
 175         public function getVersion() {
 176                 return __CLASS__ . ': $Id$';
 177         }
 178 }