SearchUpdate.php

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<?php
class SearchUpdate implements DeferrableUpdate {

        private $mId = 0, $mNamespace, $mTitle, $mText;
        private $mTitleWords;

        function __construct( $id, $title, $text = false ) {
                if ( is_string( $title ) ) {
                        $nt = Title::newFromText( $title );
                } else {
                        $nt = $title;
                }

                if( $nt ) {
                        $this->mId = $id;
                        $this->mText = $text;

                        $this->mNamespace = $nt->getNamespace();
                        $this->mTitle = $nt->getText(); # Discard namespace

                        $this->mTitleWords = $this->mTextWords = array();
                } else {
                        wfDebug( "SearchUpdate object created with invalid title '$title'\n" );
                }
        }

        function doUpdate() {
                global $wgContLang, $wgDisableSearchUpdate;

                if( $wgDisableSearchUpdate || !$this->mId ) {
                        return;
                }

                wfProfileIn( __METHOD__ );

                $search = SearchEngine::create();
                $lc = SearchEngine::legalSearchChars() . '&#;';

                if( $this->mText === false ) {
                        $search->updateTitle($this->mId,
                                $search->normalizeText( Title::indexTitle( $this->mNamespace, $this->mTitle ) ) );
                        wfProfileOut( __METHOD__ );
                        return;
                }

                # Language-specific strip/conversion
                $text = $wgContLang->normalizeForSearch( $this->mText );

                wfProfileIn( __METHOD__ . '-regexps' );
                $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 );
                wfProfileOut( __METHOD__ . '-regexps' );

                wfRunHooks( 'SearchUpdate', array( $this->mId, $this->mNamespace, $this->mTitle, &$text ) );

                # Perform the actual update
                $search->update( $this->mId, $search->normalizeText( Title::indexTitle( $this->mNamespace, $this->mTitle ) ),
                                $search->normalizeText( $text ) );

                wfProfileOut( __METHOD__ );
        }
}

class SearchUpdateMyISAM extends SearchUpdate {
        # Inherits everything
}