68d14537ea
Renamed member vars to fooBar style, use $this->rawText more consistently. Separated matching parts of goResult() out. More redundant bits purged. Switching some messages to wikitext. Death to <font> tags!
609 lines
17 KiB
PHP
609 lines
17 KiB
PHP
<?php
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# See search.doc
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define( "MW_SEARCH_OK", true );
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define( "MW_SEARCH_BAD_QUERY", false );
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class SearchEngine {
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/* private */ var $rawText, $filteredText, $searchTerms;
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/* private */ var $titleCond, $textCond;
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var $doSearchRedirects = true;
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var $addToQuery = array();
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var $namespacesToSearch = array();
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var $alternateTitle;
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var $allTitles = false;
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function SearchEngine( $text ) {
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$this->rawText = trim( $text );
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# We display the query, so let's strip it for safety
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#
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global $wgDBmysql4;
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$lc = SearchEngine::legalSearchChars() . "()";
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if( $wgDBmysql4 ) {
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$lc .= "\"~<>*+-";
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}
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$this->filteredText = trim( preg_replace( "/[^{$lc}]/", " ", $text ) );
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$this->searchTerms = array();
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$this->strictMatching = true; # Google-style, add '+' on all terms
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$this->db =& wfGetDB( DB_SLAVE );
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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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function queryNamespaces() {
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$namespaces = implode( ",", $this->namespacesToSearch );
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if ($namespaces == "") {
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$namespaces = "0";
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}
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return "AND cur_namespace IN (" . $namespaces . ")";
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}
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# Return a partial WHERE clause to include or exclude redirects from results
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function searchRedirects() {
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if ( $this->doSearchRedirects ) {
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return "";
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} else {
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return "AND cur_is_redirect=0 ";
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}
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}
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/* private */ function initNamespaceCheckbox( $i )
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{
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global $wgUser, $wgNamespacesToBeSearchedDefault;
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if ($wgUser->getID()) {
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// User is logged in so we retrieve his default namespaces
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return $wgUser->getOption( "searchNs".$i );
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} else {
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// User is not logged in so we give him the global default namespaces
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return !empty($wgNamespacesToBeSearchedDefault[ $i ]);
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}
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}
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# Display the "power search" footer. Does not actually perform the search,
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# that is done by showResults()
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function powersearch() {
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global $wgUser, $wgOut, $wgLang, $wgTitle, $wgRequest;
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$sk =& $wgUser->getSkin();
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$search = $this->rawText;
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$searchx = $wgRequest->getVal( 'searchx' );
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$listredirs = $wgRequest->getVal( 'redirs' );
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$ret = wfMsg("powersearchtext"); # Text to be returned
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$tempText = ""; # Temporary text, for substitution into $ret
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if( isset( $_REQUEST["searchx"] ) ) {
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$this->addToQuery["searchx"] = "1";
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}
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# Do namespace checkboxes
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$namespaces = $wgLang->getNamespaces();
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foreach ( $namespaces as $i => $namespace ) {
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# Skip virtual namespaces
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if ( $i < 0 ) {
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continue;
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}
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$formVar = "ns$i";
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# Initialise checkboxValues, either from defaults or from
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# a previous invocation
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if ( !isset( $searchx ) ) {
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$checkboxValue = $this->initNamespaceCheckbox( $i );
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} else {
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$checkboxValue = $wgRequest->getVal( $formVar );
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}
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$checked = "";
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if ( $checkboxValue == 1 ) {
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$checked = " checked='checked'";
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$this->addToQuery["ns{$i}"] = 1;
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array_push( $this->namespacesToSearch, $i );
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}
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$name = str_replace( "_", " ", $namespaces[$i] );
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if ( "" == $name ) {
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$name = wfMsg( "blanknamespace" );
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}
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if ( $tempText !== "" ) {
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$tempText .= " ";
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}
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$tempText .= "<input type='checkbox' value=\"1\" name=\"" .
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"ns{$i}\"{$checked} />{$name}\n";
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}
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$ret = str_replace ( "$1", $tempText, $ret );
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# List redirects checkbox
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$checked = "";
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if ( $listredirs == 1 ) {
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$this->addToQuery["redirs"] = 1;
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$checked = " checked='checked'";
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}
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$tempText = "<input type='checkbox' value='1' name=\"redirs\"{$checked} />\n";
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$ret = str_replace( "$2", $tempText, $ret );
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# Search field
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$tempText = "<input type='text' name=\"search\" value=\"" .
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htmlspecialchars( $search ) ."\" width='80' />\n";
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$ret = str_replace( "$3", $tempText, $ret );
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# Searchx button
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$tempText = "<input type='submit' name=\"searchx\" value=\"" .
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wfMsg("powersearch") . "\" />\n";
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$ret = str_replace( "$9", $tempText, $ret );
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$action = $sk->escapeSearchLink();
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$ret = "<br /><br />\n<form id=\"powersearch\" method=\"get\" " .
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"action=\"$action\">\n{$ret}\n</form>\n";
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if ( isset ( $searchx ) ) {
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if ( ! $listredirs ) {
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$this->doSearchRedirects = false;
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}
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}
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return $ret;
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}
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function setupPage() {
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global $wgOut;
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$wgOut->setPageTitle( wfMsg( "searchresults" ) );
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$wgOut->setSubtitle( wfMsg( "searchquery", htmlspecialchars( $this->rawText ) ) );
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$wgOut->setArticleRelated( false );
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$wgOut->setRobotpolicy( "noindex,nofollow" );
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}
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# Perform the search and construct the results page
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function showResults() {
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global $wgUser, $wgTitle, $wgOut, $wgLang;
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global $wgDisableTextSearch, $wgInputEncoding;
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$fname = "SearchEngine::showResults";
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$search = $this->rawText;
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$powersearch = $this->powersearch(); /* Need side-effects here? */
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$this->setupPage();
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$sk = $wgUser->getSkin();
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$wgOut->addWikiText( wfMsg( "searchresulttext" ) );
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if ( !$this->parseQuery() ) {
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$wgOut->addWikiText(
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"==" . wfMsg( "badquery" ) . "==\n" .
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wfMsg( "badquerytext" ) );
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return;
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}
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list( $limit, $offset ) = wfCheckLimits( 20, "searchlimit" );
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if ( $wgDisableTextSearch ) {
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$wgOut->addHTML( wfMsg( "searchdisabled" ) );
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$wgOut->addHTML( wfMsg( "googlesearch",
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htmlspecialchars( $this->rawText ),
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htmlspecialchars( $wgInputEncoding ) ) );
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return;
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}
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$titleMatches = $this->getMatches( $this->titleCond, $limit, $offset );
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$textMatches = $this->getMatches( $this->textCond, $limit, $offset );
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$sk = $wgUser->getSkin();
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$num = count( $titleMatches ) + count( $textMatches );
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if ( $num >= $limit ) {
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$top = wfShowingResults( $offset, $limit );
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} else {
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$top = wfShowingResultsNum( $offset, $limit, $num );
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}
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$wgOut->addHTML( "<p>{$top}</p>\n" );
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# For powersearch
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$a2l = "";
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$akk = array_keys( $this->addToQuery );
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foreach ( $akk AS $ak ) {
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$a2l .= "&{$ak}={$this->addToQuery[$ak]}" ;
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}
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$prevnext = wfViewPrevNext( $offset, $limit, "",
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"search=" . wfUrlencode( $this->filteredText ) . $a2l );
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$wgOut->addHTML( "<br />{$prevnext}\n" );
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$foundsome = $this->showMatches( $titleMatches, $offset, "notitlematches", "titlematches" )
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|| $this->showMatches( $textMatches, $offset, "notextmatches", "textmatches" );
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if ( !$foundsome ) {
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$wgOut->addWikiText( wfMsg( "nonefound" ) );
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}
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$wgOut->addHTML( "<p>{$prevnext}</p>\n" );
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$wgOut->addHTML( $powersearch );
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}
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function legalSearchChars() {
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$lc = "A-Za-z_'0-9\\x80-\\xFF\\-";
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return $lc;
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}
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function parseQuery() {
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global $wgDBmysql4;
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if( $wgDBmysql4 ) {
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# Use cleaner boolean search if available
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return $this->parseQuery4();
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} else {
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# Fall back to ugly hack with multiple search clauses
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return $this->parseQuery3();
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}
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}
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function parseQuery3() {
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global $wgDBminWordLen, $wgLang;
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# on non mysql4 database: get list of words we don't want to search for
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require_once( "FulltextStoplist.php" );
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$lc = SearchEngine::legalSearchChars() . "()";
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$q = preg_replace( "/([()])/", " \\1 ", $this->filteredText );
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$q = preg_replace( "/\\s+/", " ", $q );
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$w = explode( " ", trim( $q ) );
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$last = $cond = "";
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foreach ( $w as $word ) {
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$word = $wgLang->stripForSearch( $word );
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if ( "and" == $word || "or" == $word || "not" == $word
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|| "(" == $word || ")" == $word ) {
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$cond .= " " . strtoupper( $word );
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$last = "";
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} else if ( strlen( $word ) < $wgDBminWordLen ) {
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continue;
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} else if ( FulltextStoplist::inList( $word ) ) {
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continue;
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} else {
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if ( "" != $last ) { $cond .= " AND"; }
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$cond .= " (MATCH (##field##) AGAINST ('" .
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$this->db->strencode( $word ). "'))";
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$last = $word;
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array_push( $this->searchTerms, "\\b" . $word . "\\b" );
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}
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}
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if ( 0 == count( $this->searchTerms ) ) {
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return MW_SEARCH_BAD_QUERY;
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}
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$this->titleCond = "(" . str_replace( "##field##",
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"si_title", $cond ) . " )";
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$this->textCond = "(" . str_replace( "##field##",
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"si_text", $cond ) . " AND (cur_is_redirect=0) )";
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return MW_SEARCH_OK;
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}
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function parseQuery4() {
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global $wgLang;
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$lc = SearchEngine::legalSearchChars();
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$searchon = "";
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$this->searchTerms = array();
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# FIXME: This doesn't handle parenthetical expressions.
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if( preg_match_all( '/([-+<>~]?)(([' . $lc . ']+)(\*?)|"[^"]*")/',
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$this->filteredText, $m, PREG_SET_ORDER ) ) {
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foreach( $m as $terms ) {
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if( $searchon !== "" ) $searchon .= " ";
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if( $this->strictMatching && ($terms[1] == "") ) {
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$terms[1] = "+";
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}
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$searchon .= $terms[1] . $wgLang->stripForSearch( $terms[2] );
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if( $terms[3] ) {
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$regexp = preg_quote( $terms[3] );
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if( $terms[4] ) $regexp .= "[0-9A-Za-z_]+";
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} else {
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$regexp = preg_quote( str_replace( '"', '', $terms[2] ) );
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}
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$this->searchTerms[] = $regexp;
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}
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wfDebug( "Would search with '$searchon'\n" );
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wfDebug( "Match with /\b" . implode( '\b|\b', $this->searchTerms ) . "\b/\n" );
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} else {
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wfDebug( "Can't understand search query '{$this->filteredText}'\n" );
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}
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$searchon = $this->db->strencode( $searchon );
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$this->titleCond = " MATCH(si_title) AGAINST('$searchon' IN BOOLEAN MODE)";
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$this->textCond = " (MATCH(si_text) AGAINST('$searchon' IN BOOLEAN MODE) AND cur_is_redirect=0)";
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return MW_SEARCH_OK;
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}
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function &getMatches( $cond, $limit, $offset = 0 ) {
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$searchindex = $this->db->tableName( 'searchindex' );
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$cur = $this->db->tableName( 'cur' );
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$searchnamespaces = $this->queryNamespaces();
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$redircond = $this->searchRedirects();
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$sql = "SELECT cur_id,cur_namespace,cur_title," .
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"cur_text FROM $cur,$searchindex " .
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"WHERE cur_id=si_page AND {$cond} " .
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"{$searchnamespaces} {$redircond} " .
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$this->db->limitResult( $limit, $offset );
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$res = $this->db->query( $sql, "SearchEngine::getMatches" );
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$matches = array();
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while ( $row = $this->db->fetchObject( $res ) ) {
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$matches[] = $row;
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}
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$this->db->freeResult( $res );
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return $matches;
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}
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function showMatches( &$matches, $offset, $msgEmpty, $msgFound ) {
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global $wgOut;
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if ( 0 == count( $matches ) ) {
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$wgOut->addHTML( "<h2>" . wfMsg( $msgEmpty ) .
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"</h2>\n" );
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return false;
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} else {
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$off = $offset + 1;
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$wgOut->addHTML( "<h2>" . wfMsg( $msgFound ) .
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"</h2>\n<ol start='{$off}'>" );
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foreach( $matches as $row ) {
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$this->showHit( $row );
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}
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$wgOut->addHTML( "</ol>\n" );
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return true;
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}
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}
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function showHit( $row ) {
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global $wgUser, $wgOut, $wgLang;
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$t = Title::makeName( $row->cur_namespace, $row->cur_title );
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if( is_null( $t ) ) {
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$wgOut->addHTML( "<!-- Broken link in search result -->\n" );
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return;
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}
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$sk = $wgUser->getSkin();
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$contextlines = $wgUser->getOption( "contextlines" );
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if ( "" == $contextlines ) { $contextlines = 5; }
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$contextchars = $wgUser->getOption( "contextchars" );
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if ( "" == $contextchars ) { $contextchars = 50; }
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$link = $sk->makeKnownLink( $t, "" );
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$size = wfMsg( "nbytes", strlen( $row->cur_text ) );
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$wgOut->addHTML( "<li>{$link} ({$size})" );
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$lines = explode( "\n", $row->cur_text );
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$pat1 = "/(.*)(" . implode( "|", $this->searchTerms ) . ")(.*)/i";
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$lineno = 0;
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foreach ( $lines as $line ) {
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if ( 0 == $contextlines ) {
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break;
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}
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--$contextlines;
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++$lineno;
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if ( ! preg_match( $pat1, $line, $m ) ) {
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continue;
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}
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$pre = $wgLang->truncate( $m[1], -$contextchars, "..." );
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if ( count( $m ) < 3 ) {
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$post = "";
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} else {
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$post = $wgLang->truncate( $m[3], $contextchars, "..." );
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}
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$found = $m[2];
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$line = htmlspecialchars( $pre . $found . $post );
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$pat2 = "/(" . implode( "|", $this->searchTerms ) . ")/i";
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$line = preg_replace( $pat2,
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"<span class='searchmatch'>\\1</span>", $line );
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$wgOut->addHTML( "<br /><small>{$lineno}: {$line}</small>\n" );
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}
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$wgOut->addHTML( "</li>\n" );
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}
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function getNearMatch() {
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# Exact match? No need to look further.
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$title = Title::newFromText( $this->rawText );
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if ( $title->getNamespace() == NS_SPECIAL || 0 != $title->getArticleID() ) {
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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( $this->rawText ) );
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if ( 0 != $title->getArticleID() ) {
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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( $this->rawText ) ) );
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if ( 0 != $title->getArticleID() ) {
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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( $this->rawText ) );
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if ( 0 != $title->getArticleID() ) {
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return $title;
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}
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# Entering an IP address goes to the contributions page
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if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $this->rawText ) ) {
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$title = Title::makeTitle( NS_SPECIAL, "Contributions/" . $this->rawText );
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return $title;
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}
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return NULL;
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}
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function goResult() {
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global $wgOut, $wgGoToEdit;
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global $wgDisableTextSearch;
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$fname = "SearchEngine::goResult";
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# Try to go to page as entered.
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#
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$t = Title::newFromText( $this->rawText );
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# If the string cannot be used to create a title
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if( is_null( $t ) ){
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$this->showResults();
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return;
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}
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# If there's an exact or very near match, jump right there.
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$t = $this->getNearMatch();
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if( !is_null( $t ) ) {
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$wgOut->redirect( $t->getFullURL() );
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return;
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}
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# No match, generate an edit URL
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$t = Title::newFromText( $this->rawText );
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# If the feature is enabled, go straight to the edit page
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if ( $wgGoToEdit ) {
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$wgOut->redirect( $t->getFullURL( "action=edit" ) );
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return;
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}
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if( $t ) {
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$editurl = $t->escapeLocalURL( "action=edit" );
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} else {
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$editurl = ""; # ??
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}
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$wgOut->addHTML( "<p>" . wfMsg("nogomatch", $editurl ) . "</p>\n" );
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# Try a fuzzy title search
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$anyhit = false;
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global $wgDisableFuzzySearch;
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if(! $wgDisableFuzzySearch ){
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foreach( array(NS_MAIN, NS_WP, NS_USER, NS_IMAGE, NS_MEDIAWIKI) as $namespace){
|
|
$anyhit |= SearchEngine::doFuzzyTitleSearch( $this->rawText, $namespace );
|
|
}
|
|
}
|
|
|
|
if( ! $anyhit ){
|
|
return $this->showResults();
|
|
}
|
|
}
|
|
|
|
/* static */ function doFuzzyTitleSearch( $search, $namespace ){
|
|
global $wgLang, $wgOut;
|
|
|
|
$this->setupPage();
|
|
|
|
$sstr = ucfirst($search);
|
|
$sstr = str_replace(" ", "_", $sstr);
|
|
$fuzzymatches = SearchEngine::fuzzyTitles( $sstr, $namespace );
|
|
$fuzzymatches = array_slice($fuzzymatches, 0, 10);
|
|
$slen = strlen( $search );
|
|
$wikitext = "";
|
|
foreach($fuzzymatches as $res){
|
|
$t = str_replace("_", " ", $res[1]);
|
|
$tfull = $wgLang->getNsText( $namespace ) . ":$t|$t";
|
|
if( $namespace == NS_MAIN )
|
|
$tfull = "$t";
|
|
$distance = $res[0];
|
|
$closeness = (strlen( $search ) - $distance) / strlen( $search );
|
|
$percent = intval( $closeness * 100 ) . "%";
|
|
$stars = str_repeat("*", ceil(5 * $closeness) );
|
|
$wikitext .= "* [[$tfull]] $percent ($stars)\n";
|
|
}
|
|
if( $wikitext ){
|
|
if( $namespace != NS_MAIN )
|
|
$wikitext = "=== " . $wgLang->getNsText( $namespace ) . " ===\n" . $wikitext;
|
|
$wgOut->addWikiText( $wikitext );
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* static */ function fuzzyTitles( $sstr, $namespace = NS_MAIN ){
|
|
$span = 0.10; // weed on title length before doing levenshtein.
|
|
$tolerance = 0.35; // allowed percentage of erronous characters
|
|
$slen = strlen($sstr);
|
|
$tolerance_count = ceil($tolerance * $slen);
|
|
$spanabs = ceil($slen * (1 + $span)) - $slen;
|
|
# print "Word: $sstr, len = $slen, range = [$min, $max], tolerance_count = $tolerance_count<BR>\n";
|
|
$result = array();
|
|
$cnt = 0;
|
|
for( $i=0; $i <= $spanabs; $i++ ){
|
|
$titles = SearchEngine::getTitlesByLength( $slen + $i, $namespace );
|
|
if( $i != 0) {
|
|
$titles = array_merge($titles, SearchEngine::getTitlesByLength( $slen - $i, $namespace ) );
|
|
}
|
|
foreach($titles as $t){
|
|
$d = levenshtein($sstr, $t);
|
|
if($d < $tolerance_count)
|
|
$result[] = array($d, $t);
|
|
$cnt++;
|
|
}
|
|
}
|
|
usort($result, "SearchEngine_pcmp");
|
|
return $result;
|
|
}
|
|
|
|
/* static */ function getTitlesByLength($aLength, $aNamespace = 0){
|
|
global $wgMemc, $wgDBname;
|
|
$fname = 'SearchEngin::getTitlesByLength';
|
|
|
|
// to avoid multiple costly SELECTs in case of no memcached
|
|
if( $this->allTitles ){
|
|
if( isset( $this->allTitles[$aLength][$aNamespace] ) ){
|
|
return $this->allTitles[$aLength][$aNamespace];
|
|
} else {
|
|
return array();
|
|
}
|
|
}
|
|
|
|
$mkey = "$wgDBname:titlesbylength:$aLength:$aNamespace";
|
|
$mkeyts = "$wgDBname:titlesbylength:createtime";
|
|
$ts = $wgMemc->get( $mkeyts );
|
|
$result = $wgMemc->get( $mkey );
|
|
|
|
if( time() - $ts < 3600 ){
|
|
// note: in case of insufficient memcached space, we return
|
|
// an empty list instead of starting to hit the DB.
|
|
return is_array( $result ) ? $result : array();
|
|
}
|
|
|
|
$wgMemc->set( $mkeyts, time() );
|
|
|
|
$res = $this->db->select( 'cur', array( 'cur_title', 'cur_namespace' ), false, $fname );
|
|
$titles = array(); // length, ns, [titles]
|
|
while( $obj = $this->db->fetchObject( $res ) ){
|
|
$title = $obj->cur_title;
|
|
$ns = $obj->cur_namespace;
|
|
$len = strlen( $title );
|
|
$titles[$len][$ns][] = $title;
|
|
}
|
|
foreach($titles as $length => $length_arr){
|
|
foreach($length_arr as $ns => $title_arr){
|
|
$mkey = "$wgDBname:titlesbylength:$length:$ns";
|
|
$wgMemc->set( $mkey, $title_arr, 3600 * 24 );
|
|
}
|
|
}
|
|
$this->allTitles = $titles;
|
|
if( isset( $titles[$aLength][$aNamespace] ) )
|
|
return $titles[$aLength][$aNamespace];
|
|
else
|
|
return array();
|
|
}
|
|
}
|
|
|
|
/* private static */ function SearchEngine_pcmp($a, $b){ return $a[0] - $b[0]; }
|
|
|
|
?>
|