347 lines
7.3 KiB
PHP
347 lines
7.3 KiB
PHP
<?php
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/**
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* Contain a class for special pages
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* @package MediaWiki
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* @subpackage Search
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*/
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/**
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* @package MediaWiki
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*/
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class SearchEngine {
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var $limit = 10;
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var $offset = 0;
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var $searchTerms = array();
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var $namespaces = array( NS_MAIN );
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var $showRedirects = false;
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/**
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* Perform a full text search query and return a result set.
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* If title searches are not supported or disabled, return null.
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*
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* @param string $term - Raw search term
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* @return SearchResultSet
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* @access public
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* @abstract
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*/
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function searchText( $term ) {
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return null;
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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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* If title searches are not supported or disabled, return null.
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*
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* @param string $term - Raw search term
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* @return SearchResultSet
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* @access public
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* @abstract
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*/
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function searchTitle( $term ) {
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return null;
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}
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/**
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* If an exact title match can be find, or a very slightly close match,
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* return the title. If no match, returns NULL.
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*
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* @static
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* @param string $term
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* @return Title
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* @access private
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*/
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function getNearMatch( $term ) {
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# Exact match? No need to look further.
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$title = Title::newFromText( $term );
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if (is_null($title))
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return NULL;
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if ( $title->getNamespace() == NS_SPECIAL || $title->exists() ) {
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return $title;
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}
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# Now try all lower case (i.e. first letter capitalized)
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#
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$title = Title::newFromText( strtolower( $term ) );
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if ( $title->exists() ) {
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return $title;
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}
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# Now try capitalized string
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#
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$title = Title::newFromText( ucwords( strtolower( $term ) ) );
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if ( $title->exists() ) {
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return $title;
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}
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# Now try all upper case
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#
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$title = Title::newFromText( strtoupper( $term ) );
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if ( $title->exists() ) {
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return $title;
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}
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# Now try Word-Caps-Breaking-At-Word-Breaks, for hyphenated names etc
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$title = Title::newFromText( preg_replace_callback(
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'/\b([\w\x80-\xff]+)\b/',
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create_function( '$matches', '
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global $wgContLang;
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return $wgContLang->ucfirst($matches[1]);
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' ),
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$term ) );
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if ( $title->exists() ) {
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return $title;
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}
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global $wgCapitalLinks, $wgContLang;
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if( !$wgCapitalLinks ) {
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// Catch differs-by-first-letter-case-only
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$title = Title::newFromText( $wgContLang->ucfirst( $term ) );
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if ( $title->exists() ) {
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return $title;
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}
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$title = Title::newFromText( $wgContLang->lcfirst( $term ) );
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if ( $title->exists() ) {
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return $title;
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}
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}
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$title = Title::newFromText( $term );
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# Entering an IP address goes to the contributions page
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if ( ( $title->getNamespace() == NS_USER && User::isIP($title->getText() ) )
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|| User::isIP( trim( $term ) ) ) {
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return Title::makeTitle( NS_SPECIAL, "Contributions/" . $title->getDbkey() );
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}
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# Entering a user goes to the user page whether it's there or not
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if ( $title->getNamespace() == NS_USER ) {
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return $title;
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}
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# Quoted term? Try without the quotes...
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if( preg_match( '/^"([^"]+)"$/', $term, $matches ) ) {
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return SearchEngine::getNearMatch( $matches[1] );
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}
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return NULL;
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}
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function legalSearchChars() {
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return "A-Za-z_'0-9\\x80-\\xFF\\-";
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}
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/**
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* Set the maximum number of results to return
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* and how many to skip before returning the first.
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*
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* @param int $limit
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* @param int $offset
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* @access public
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*/
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function setLimitOffset( $limit, $offset = 0 ) {
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$this->limit = intval( $limit );
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$this->offset = intval( $offset );
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}
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/**
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* Set which namespaces the search should include.
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* Give an array of namespace index numbers.
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*
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* @param array $namespaces
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* @access public
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*/
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function setNamespaces( $namespaces ) {
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$this->namespaces = $namespaces;
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}
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/**
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* Make a list of searchable namespaces and their canonical names.
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* @return array
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* @access public
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*/
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function searchableNamespaces() {
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global $wgContLang;
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$arr = array();
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foreach( $wgContLang->getNamespaces() as $ns => $name ) {
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if( $ns >= NS_MAIN ) {
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$arr[$ns] = $name;
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}
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}
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return $arr;
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}
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/**
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* Return a 'cleaned up' search string
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*
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* @return string
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* @access public
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*/
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function filter( $text ) {
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$lc = $this->legalSearchChars();
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return trim( preg_replace( "/[^{$lc}]/", " ", $text ) );
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}
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/**
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* Load up the appropriate search engine class for the currently
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* active database backend, and return a configured instance.
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*
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* @return SearchEngine
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* @access private
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*/
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function create() {
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global $wgDBtype, $wgSearchType;
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if( $wgSearchType ) {
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$class = $wgSearchType;
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} elseif( $wgDBtype == 'mysql' ) {
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$class = 'SearchMySQL4';
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require_once( 'SearchMySQL4.php' );
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} else if ( $wgDBtype == 'PostgreSQL' ) {
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$class = 'SearchTsearch2';
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require_once( 'SearchTsearch2.php' );
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} else {
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$class = 'SearchEngineDummy';
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}
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$search = new $class( wfGetDB( DB_SLAVE ) );
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$search->setLimitOffset(0,0);
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return $search;
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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 int $id
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* @param string $title
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* @param string $text
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* @abstract
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*/
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function update( $id, $title, $text ) {
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// no-op
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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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* @abstract
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*/
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function updateTitle( $id, $title ) {
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// no-op
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}
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}
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/** @package MediaWiki */
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class SearchResultSet {
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/**
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* Fetch an array of regular expression fragments for matching
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* the search terms as parsed by this engine in a text extract.
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*
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* @return array
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* @access public
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* @abstract
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*/
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function termMatches() {
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return array();
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}
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function numRows() {
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return 0;
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}
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/**
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* Return true if results are included in this result set.
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* @return bool
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* @abstract
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*/
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function hasResults() {
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return false;
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}
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/**
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* Some search modes return a total hit count for the query
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* in the entire article database. This may include pages
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* in namespaces that would not be matched on the given
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* settings.
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*
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* Return null if no total hits number is supported.
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*
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* @return int
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* @access public
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*/
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function getTotalHits() {
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return null;
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}
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/**
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* Some search modes return a suggested alternate term if there are
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* no exact hits. Returns true if there is one on this set.
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*
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* @return bool
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* @access public
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*/
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function hasSuggestion() {
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return false;
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}
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/**
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* Some search modes return a suggested alternate term if there are
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* no exact hits. Check hasSuggestion() first.
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*
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* @return string
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* @access public
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*/
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function getSuggestion() {
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return '';
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}
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/**
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* Fetches next search result, or false.
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* @return SearchResult
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* @access public
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* @abstract
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*/
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function next() {
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return false;
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}
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}
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/** @package MediaWiki */
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class SearchResult {
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function SearchResult( $row ) {
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$this->mTitle = Title::makeTitle( $row->page_namespace, $row->page_title );
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}
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/**
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* @return Title
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* @access public
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*/
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function getTitle() {
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return $this->mTitle;
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}
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/**
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* @return double or null if not supported
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*/
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function getScore() {
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return null;
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}
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}
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/**
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* @package MediaWiki
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*/
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class SearchEngineDummy {
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function search( $term ) {
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return null;
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}
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function setLimitOffset($l, $o) {}
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function legalSearchChars() {}
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function update() {}
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function setnamespaces() {}
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function searchtitle() {}
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function searchtext() {}
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}
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?>
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