%PDF-
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Mini Shell
Mini Shell
<?php
/**
* Oracle search engine
*
* Copyright © 2004 Brion Vibber <brion@pobox.com>
* https://www.mediawiki.org/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Search
*/
use MediaWiki\MediaWikiServices;
/**
* Search engine hook base class for Oracle (ConText).
* @ingroup Search
*/
class SearchOracle extends SearchDatabase {
private $reservedWords = [
'ABOUT' => 1,
'ACCUM' => 1,
'AND' => 1,
'BT' => 1,
'BTG' => 1,
'BTI' => 1,
'BTP' => 1,
'FUZZY' => 1,
'HASPATH' => 1,
'INPATH' => 1,
'MINUS' => 1,
'NEAR' => 1,
'NOT' => 1,
'NT' => 1,
'NTG' => 1,
'NTI' => 1,
'NTP' => 1,
'OR' => 1,
'PT' => 1,
'RT' => 1,
'SQE' => 1,
'SYN' => 1,
'TR' => 1,
'TRSYN' => 1,
'TT' => 1,
'WITHIN' => 1,
];
/**
* Perform a full text search query and return a result set.
*
* @param string $term Raw search term
* @return SqlSearchResultSet
*/
protected function doSearchTextInDB( $term ) {
if ( $term == '' ) {
return new SqlSearchResultSet( false, '' );
}
$resultSet = $this->db->query( $this->getQuery( $this->filter( $term ), true ) );
return new SqlSearchResultSet( $resultSet, $this->searchTerms );
}
/**
* Perform a title-only search query and return a result set.
*
* @param string $term Raw search term
* @return SqlSearchResultSet
*/
protected function doSearchTitleInDB( $term ) {
if ( $term == '' ) {
return new SqlSearchResultSet( false, '' );
}
$resultSet = $this->db->query( $this->getQuery( $this->filter( $term ), false ) );
return new SqlSearchResultSet( $resultSet, $this->searchTerms );
}
/**
* Return a partial WHERE clause to limit the search to the given namespaces
* @return string
*/
private function queryNamespaces() {
if ( is_null( $this->namespaces ) ) {
return '';
}
if ( !count( $this->namespaces ) ) {
$namespaces = '0';
} else {
$namespaces = $this->db->makeList( $this->namespaces );
}
return 'AND page_namespace IN (' . $namespaces . ')';
}
/**
* Return a LIMIT clause to limit results on the query.
*
* @param string $sql
*
* @return string
*/
private function queryLimit( $sql ) {
return $this->db->limitResult( $sql, $this->limit, $this->offset );
}
/**
* Does not do anything for generic search engine
* subclasses may define this though
*
* @param string $filteredTerm
* @param bool $fulltext
* @return string
*/
function queryRanking( $filteredTerm, $fulltext ) {
return ' ORDER BY score(1)';
}
/**
* Construct the full SQL query to do the search.
* The guts shoulds be constructed in queryMain()
* @param string $filteredTerm
* @param bool $fulltext
* @return string
*/
private function getQuery( $filteredTerm, $fulltext ) {
return $this->queryLimit( $this->queryMain( $filteredTerm, $fulltext ) . ' ' .
$this->queryNamespaces() . ' ' .
$this->queryRanking( $filteredTerm, $fulltext ) . ' ' );
}
/**
* Picks which field to index on, depending on what type of query.
* @param bool $fulltext
* @return string
*/
private function getIndexField( $fulltext ) {
return $fulltext ? 'si_text' : 'si_title';
}
/**
* Get the base part of the search query.
*
* @param string $filteredTerm
* @param bool $fulltext
* @return string
*/
function queryMain( $filteredTerm, $fulltext ) {
$match = $this->parseQuery( $filteredTerm, $fulltext );
$page = $this->db->tableName( 'page' );
$searchindex = $this->db->tableName( 'searchindex' );
return 'SELECT page_id, page_namespace, page_title ' .
"FROM $page,$searchindex " .
'WHERE page_id=si_page AND ' . $match;
}
/**
* Parse a user input search string, and return an SQL fragment to be used
* as part of a WHERE clause
* @param string $filteredText
* @param bool $fulltext
* @return string
*/
private function parseQuery( $filteredText, $fulltext ) {
$lc = $this->legalSearchChars( self::CHARS_NO_SYNTAX );
$this->searchTerms = [];
# @todo FIXME: This doesn't handle parenthetical expressions.
$m = [];
$searchon = '';
if ( preg_match_all( '/([-+<>~]?)(([' . $lc . ']+)(\*?)|"[^"]*")/',
$filteredText, $m, PREG_SET_ORDER ) ) {
foreach ( $m as $terms ) {
// Search terms in all variant forms, only
// apply on wiki with LanguageConverter
$temp_terms = MediaWikiServices::getInstance()->getContentLanguage()->
autoConvertToAllVariants( $terms[2] );
if ( is_array( $temp_terms ) ) {
$temp_terms = array_unique( array_values( $temp_terms ) );
foreach ( $temp_terms as $t ) {
$searchon .= ( $terms[1] == '-' ? ' ~' : ' & ' ) . $this->escapeTerm( $t );
}
} else {
$searchon .= ( $terms[1] == '-' ? ' ~' : ' & ' ) . $this->escapeTerm( $terms[2] );
}
if ( !empty( $terms[3] ) ) {
$regexp = preg_quote( $terms[3], '/' );
if ( $terms[4] ) {
$regexp .= "[0-9A-Za-z_]+";
}
} else {
$regexp = preg_quote( str_replace( '"', '', $terms[2] ), '/' );
}
$this->searchTerms[] = $regexp;
}
}
$searchon = $this->db->addQuotes( ltrim( $searchon, ' &' ) );
$field = $this->getIndexField( $fulltext );
return " CONTAINS($field, $searchon, 1) > 0 ";
}
private function escapeTerm( $t ) {
$t = MediaWikiServices::getInstance()->getContentLanguage()->normalizeForSearch( $t );
$t = isset( $this->reservedWords[strtoupper( $t )] ) ? '{' . $t . '}' : $t;
$t = preg_replace( '/^"(.*)"$/', '($1)', $t );
$t = preg_replace( '/([-&|])/', '\\\\$1', $t );
return $t;
}
/**
* Create or update the search index record for the given page.
* Title and text should be pre-processed.
*
* @param int $id
* @param string $title
* @param string $text
*/
function update( $id, $title, $text ) {
$dbw = wfGetDB( DB_MASTER );
$dbw->replace( 'searchindex',
[ 'si_page' ],
[
'si_page' => $id,
'si_title' => $title,
'si_text' => $text
], 'SearchOracle::update' );
// Sync the index
// We need to specify the DB name (i.e. user/schema) here so that
// it can work from the installer, where
// ALTER SESSION SET CURRENT_SCHEMA = ...
// was used.
$dbw->query( "CALL ctx_ddl.sync_index(" .
$dbw->addQuotes( $dbw->getDBname() . '.' . $dbw->tableName( 'si_text_idx', 'raw' ) ) . ")" );
$dbw->query( "CALL ctx_ddl.sync_index(" .
$dbw->addQuotes( $dbw->getDBname() . '.' . $dbw->tableName( 'si_title_idx', 'raw' ) ) . ")" );
}
/**
* Update a search index record's title only.
* Title should be pre-processed.
*
* @param int $id
* @param string $title
*/
function updateTitle( $id, $title ) {
$dbw = wfGetDB( DB_MASTER );
$dbw->update( 'searchindex',
[ 'si_title' => $title ],
[ 'si_page' => $id ],
'SearchOracle::updateTitle',
[] );
}
public static function legalSearchChars( $type = self::CHARS_ALL ) {
$searchChars = parent::legalSearchChars( $type );
if ( $type === self::CHARS_ALL ) {
$searchChars = "\"" . $searchChars;
}
return $searchChars;
}
}
Zerion Mini Shell 1.0