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<?php
/**
* Search index updater
*
* See deferred.txt
*
* 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
*/
/**
* Database independant search index updater
*
* @ingroup Search
*/
class SearchUpdate implements DeferrableUpdate {
/** @var int Page id being updated */
private $id = 0;
/** @var Title Title we're updating */
private $title;
/** @var Content|bool Content of the page (not text) */
private $content;
/**
* Constructor
*
* @param int $id Page id to update
* @param Title|string $title Title of page to update
* @param Content|string|bool $c Content of the page to update. Default: false.
* If a Content object, text will be gotten from it. String is for back-compat.
* Passing false tells the backend to just update the title, not the content
*/
public function __construct( $id, $title, $c = false ) {
if ( is_string( $title ) ) {
$nt = Title::newFromText( $title );
} else {
$nt = $title;
}
if ( $nt ) {
$this->id = $id;
// is_string() check is back-compat for ApprovedRevs
if ( is_string( $c ) ) {
$this->content = new TextContent( $c );
} else {
$this->content = $c ?: false;
}
$this->title = $nt;
} else {
wfDebug( "SearchUpdate object created with invalid title '$title'\n" );
}
}
/**
* Perform actual update for the entry
*/
public function doUpdate() {
global $wgDisableSearchUpdate;
if ( $wgDisableSearchUpdate || !$this->id ) {
return;
}
$page = WikiPage::newFromID( $this->id, WikiPage::READ_LATEST );
foreach ( SearchEngine::getSearchTypes() as $type ) {
$search = SearchEngine::create( $type );
$indexTitle = $this->indexTitle( $search );
if ( !$search->supports( 'search-update' ) ) {
continue;
}
$normalTitle = $search->normalizeText( $indexTitle );
if ( $page === null ) {
$search->delete( $this->id, $normalTitle );
continue;
} elseif ( $this->content === false ) {
$search->updateTitle( $this->id, $normalTitle );
continue;
}
$text = $search->getTextFromContent( $this->title, $this->content );
if ( !$search->textAlreadyUpdatedForIndex() ) {
$text = self::updateText( $text );
}
# Perform the actual update
$search->update( $this->id, $normalTitle, $search->normalizeText( $text ) );
}
}
/**
* Clean text for indexing. Only really suitable for indexing in databases.
* If you're using a real search engine, you'll probably want to override
* this behavior and do something nicer with the original wikitext.
* @param string $text
* @return string
*/
public static function updateText( $text ) {
global $wgContLang;
# Language-specific strip/conversion
$text = $wgContLang->normalizeForSearch( $text );
$lc = SearchEngine::legalSearchChars() . '&#;';
$text = preg_replace( "/<\\/?\\s*[A-Za-z][^>]*?>/",
' ', $wgContLang->lc( " " . $text . " " ) ); # Strip HTML markup
$text = preg_replace( "/(^|\\n)==\\s*([^\\n]+)\\s*==(\\s)/sD",
"\\1\\2 \\2 \\2\\3", $text ); # Emphasize headings
# Strip external URLs
$uc = "A-Za-z0-9_\\/:.,~%\\-+&;#?!=()@\\x80-\\xFF";
$protos = "http|https|ftp|mailto|news|gopher";
$pat = "/(^|[^\\[])({$protos}):[{$uc}]+([^{$uc}]|$)/";
$text = preg_replace( $pat, "\\1 \\3", $text );
$p1 = "/([^\\[])\\[({$protos}):[{$uc}]+]/";
$p2 = "/([^\\[])\\[({$protos}):[{$uc}]+\\s+([^\\]]+)]/";
$text = preg_replace( $p1, "\\1 ", $text );
$text = preg_replace( $p2, "\\1 \\3 ", $text );
# Internal image links
$pat2 = "/\\[\\[image:([{$uc}]+)\\.(gif|png|jpg|jpeg)([^{$uc}])/i";
$text = preg_replace( $pat2, " \\1 \\3", $text );
$text = preg_replace( "/([^{$lc}])([{$lc}]+)]]([a-z]+)/",
"\\1\\2 \\2\\3", $text ); # Handle [[game]]s
# Strip all remaining non-search characters
$text = preg_replace( "/[^{$lc}]+/", " ", $text );
# Handle 's, s'
#
# $text = preg_replace( "/([{$lc}]+)'s /", "\\1 \\1's ", $text );
# $text = preg_replace( "/([{$lc}]+)s' /", "\\1s ", $text );
#
# These tail-anchored regexps are insanely slow. The worst case comes
# when Japanese or Chinese text (ie, no word spacing) is written on
# a wiki configured for Western UTF-8 mode. The Unicode characters are
# expanded to hex codes and the "words" are very long paragraph-length
# monstrosities. On a large page the above regexps may take over 20
# seconds *each* on a 1GHz-level processor.
#
# Following are reversed versions which are consistently fast
# (about 3 milliseconds on 1GHz-level processor).
#
$text = strrev( preg_replace( "/ s'([{$lc}]+)/", " s'\\1 \\1", strrev( $text ) ) );
$text = strrev( preg_replace( "/ 's([{$lc}]+)/", " s\\1", strrev( $text ) ) );
# Strip wiki '' and '''
$text = preg_replace( "/''[']*/", " ", $text );
return $text;
}
/**
* Get a string representation of a title suitable for
* including in a search index
*
* @param SearchEngine $search
* @return string A stripped-down title string ready for the search index
*/
private function indexTitle( SearchEngine $search ) {
global $wgContLang;
$ns = $this->title->getNamespace();
$title = $this->title->getText();
$lc = $search->legalSearchChars() . '&#;';
$t = $wgContLang->normalizeForSearch( $title );
$t = preg_replace( "/[^{$lc}]+/", ' ', $t );
$t = $wgContLang->lc( $t );
# Handle 's, s'
$t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
$t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
$t = preg_replace( "/\\s+/", ' ', $t );
if ( $ns == NS_FILE ) {
$t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
}
return trim( $t );
}
}
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