268 lines
7.1 KiB
PHP
268 lines
7.1 KiB
PHP
<?php
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# Copyright (C) 2004 Brion Vibber <brion@pobox.com>
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# http://www.mediawiki.org/
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# http://www.gnu.org/copyleft/gpl.html
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/**
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* @file
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* @ingroup Search
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*/
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/**
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* Search engine hook base class for Oracle (ConText).
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* @ingroup Search
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*/
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class SearchOracle extends SearchEngine {
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private $reservedWords = array ('ABOUT' => 1,
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'ACCUM' => 1,
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'AND' => 1,
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'BT' => 1,
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'BTG' => 1,
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'BTI' => 1,
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'BTP' => 1,
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'FUZZY' => 1,
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'HASPATH' => 1,
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'INPATH' => 1,
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'MINUS' => 1,
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'NEAR' => 1,
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'NOT' => 1,
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'NT' => 1,
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'NTG' => 1,
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'NTI' => 1,
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'NTP' => 1,
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'OR' => 1,
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'PT' => 1,
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'RT' => 1,
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'SQE' => 1,
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'SYN' => 1,
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'TR' => 1,
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'TRSYN' => 1,
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'TT' => 1,
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'WITHIN' => 1);
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function __construct($db) {
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$this->db = $db;
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}
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/**
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* Perform a full text search query and return a result set.
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*
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* @param $term String: raw search term
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* @return SqlSearchResultSet
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*/
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function searchText( $term ) {
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if ($term == '')
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return new SqlSearchResultSet(false, '');
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$resultSet = $this->db->resultObject($this->db->query($this->getQuery($this->filter($term), true)));
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return new SqlSearchResultSet($resultSet, $this->searchTerms);
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}
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/**
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* Perform a title-only search query and return a result set.
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*
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* @param $term String: raw search term
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* @return SqlSearchResultSet
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*/
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function searchTitle($term) {
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if ($term == '')
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return new SqlSearchResultSet(false, '');
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$resultSet = $this->db->resultObject($this->db->query($this->getQuery($this->filter($term), false)));
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return new MySQLSearchResultSet($resultSet, $this->searchTerms);
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}
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/**
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* Return a partial WHERE clause to exclude redirects, if so set
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* @return String
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*/
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function queryRedirect() {
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if ($this->showRedirects) {
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return '';
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} else {
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return 'AND page_is_redirect=0';
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}
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}
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/**
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* Return a partial WHERE clause to limit the search to the given namespaces
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* @return String
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*/
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function queryNamespaces() {
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if( is_null($this->namespaces) )
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return '';
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if ( !count( $this->namespaces ) ) {
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$namespaces = '0';
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} else {
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$namespaces = $this->db->makeList( $this->namespaces );
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}
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return 'AND page_namespace IN (' . $namespaces . ')';
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}
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/**
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* Return a LIMIT clause to limit results on the query.
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* @return String
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*/
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function queryLimit($sql) {
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return $this->db->limitResult($sql, $this->limit, $this->offset);
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}
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/**
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* Does not do anything for generic search engine
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* subclasses may define this though
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* @return String
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*/
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function queryRanking($filteredTerm, $fulltext) {
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return ' ORDER BY score(1)';
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}
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/**
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* Construct the full SQL query to do the search.
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* The guts shoulds be constructed in queryMain()
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* @param $filteredTerm String
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* @param $fulltext Boolean
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*/
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function getQuery( $filteredTerm, $fulltext ) {
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return $this->queryLimit($this->queryMain($filteredTerm, $fulltext) . ' ' .
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$this->queryRedirect() . ' ' .
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$this->queryNamespaces() . ' ' .
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$this->queryRanking( $filteredTerm, $fulltext ) . ' ');
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}
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/**
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* Picks which field to index on, depending on what type of query.
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* @param $fulltext Boolean
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* @return String
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*/
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function getIndexField($fulltext) {
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return $fulltext ? 'si_text' : 'si_title';
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}
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/**
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* Get the base part of the search query.
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*
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* @param $filteredTerm String
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* @param $fulltext Boolean
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* @return String
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*/
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function queryMain( $filteredTerm, $fulltext ) {
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$match = $this->parseQuery($filteredTerm, $fulltext);
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$page = $this->db->tableName('page');
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$searchindex = $this->db->tableName('searchindex');
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return 'SELECT page_id, page_namespace, page_title ' .
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"FROM $page,$searchindex " .
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'WHERE page_id=si_page AND ' . $match;
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}
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/**
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* Parse a user input search string, and return an SQL fragment to be used
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* as part of a WHERE clause
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*/
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function parseQuery($filteredText, $fulltext) {
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global $wgContLang;
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$lc = SearchEngine::legalSearchChars();
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$this->searchTerms = array();
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# FIXME: This doesn't handle parenthetical expressions.
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$m = array();
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$searchon = '';
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if (preg_match_all('/([-+<>~]?)(([' . $lc . ']+)(\*?)|"[^"]*")/',
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$filteredText, $m, PREG_SET_ORDER)) {
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foreach($m as $terms) {
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// Search terms in all variant forms, only
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// apply on wiki with LanguageConverter
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$temp_terms = $wgContLang->autoConvertToAllVariants( $terms[2] );
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if( is_array( $temp_terms )) {
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$temp_terms = array_unique( array_values( $temp_terms ));
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foreach( $temp_terms as $t ) {
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$searchon .= ($terms[1] == '-' ? ' ~' : ' & ') . $this->escapeTerm( $t );
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}
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}
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else {
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$searchon .= ($terms[1] == '-' ? ' ~' : ' & ') . $this->escapeTerm( $terms[2] );
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}
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if (!empty($terms[3])) {
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$regexp = preg_quote( $terms[3], '/' );
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if ($terms[4])
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$regexp .= "[0-9A-Za-z_]+";
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} else {
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$regexp = preg_quote(str_replace('"', '', $terms[2]), '/');
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}
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$this->searchTerms[] = $regexp;
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}
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}
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$searchon = $this->db->addQuotes(ltrim($searchon, ' &'));
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$field = $this->getIndexField($fulltext);
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return " CONTAINS($field, $searchon, 1) > 0 ";
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}
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private function escapeTerm($t) {
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global $wgContLang;
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$t = $wgContLang->normalizeForSearch($t);
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$t = isset($this->reservedWords[strtoupper($t)]) ? '{'.$t.'}' : $t;
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$t = preg_replace('/^"(.*)"$/', '($1)', $t);
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$t = preg_replace('/([-&|])/', '\\\\$1', $t);
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return $t;
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}
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/**
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* Create or update the search index record for the given page.
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* Title and text should be pre-processed.
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*
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* @param $id Integer
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* @param $title String
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* @param $text String
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*/
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function update($id, $title, $text) {
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$dbw = wfGetDB(DB_MASTER);
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$dbw->replace('searchindex',
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array('si_page'),
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array(
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'si_page' => $id,
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'si_title' => $title,
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'si_text' => $text
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), 'SearchOracle::update' );
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$dbw->query("CALL ctx_ddl.sync_index('si_text_idx')");
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$dbw->query("CALL ctx_ddl.sync_index('si_title_idx')");
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}
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/**
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* Update a search index record's title only.
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* Title should be pre-processed.
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*
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* @param int $id
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* @param string $title
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*/
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function updateTitle($id, $title) {
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$dbw = wfGetDB(DB_MASTER);
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$dbw->update('searchindex',
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array('si_title' => $title),
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array('si_page' => $id),
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'SearchOracle::updateTitle',
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array());
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}
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public static function legalSearchChars() {
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return "\"" . parent::legalSearchChars();
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}
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}
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