includes/SearchUpdate.php

   1 <?php
   2 /**
   3  * See deferred.txt
   4  * @ingroup Search
   5  */
   6 class SearchUpdate {
   7
   8         /* private */ var $mId = 0, $mNamespace, $mTitle, $mText;
   9         /* private */ var $mTitleWords;
  10
  11         function SearchUpdate( $id, $title, $text = false ) {
  12                 $nt = Title::newFromText( $title );
  13                 if( $nt ) {
  14                         $this->mId = $id;
  15                         $this->mText = $text;
  16
  17                         $this->mNamespace = $nt->getNamespace();
  18                         $this->mTitle = $nt->getText(); # Discard namespace
  19
  20                         $this->mTitleWords = $this->mTextWords = array();
  21                 } else {
  22                         wfDebug( "SearchUpdate object created with invalid title '$title'\n" );
  23                 }
  24         }
  25
  26         function doUpdate() {
  27                 global $wgContLang, $wgDisableSearchUpdate;
  28
  29                 if( $wgDisableSearchUpdate || !$this->mId ) {
  30                         return false;
  31                 }
  32                 $fname = 'SearchUpdate::doUpdate';
  33                 wfProfileIn( $fname );
  34
  35                 $search = SearchEngine::create();
  36                 $lc = SearchEngine::legalSearchChars() . '&#;';
  37
  38                 if( $this->mText === false ) {
  39                         $search->updateTitle($this->mId,
  40                                 Title::indexTitle( $this->mNamespace, $this->mTitle ));
  41                         wfProfileOut( $fname );
  42                         return;
  43                 }
  44
  45                 # Language-specific strip/conversion
  46                 $text = $wgContLang->stripForSearch( $this->mText );
  47
  48                 wfProfileIn( $fname.'-regexps' );
  49                 $text = preg_replace( "/<\\/?\\s*[A-Za-z][A-Za-z0-9]*\\s*([^>]*?)>/",
  50                   ' ', strtolower( " " . $text /*$this->mText*/ . " " ) ); # Strip HTML markup
  51                 $text = preg_replace( "/(^|\\n)==\\s*([^\\n]+)\\s*==(\\s)/sD",
  52                   "\\1\\2 \\2 \\2\\3", $text ); # Emphasize headings
  53
  54                 # Strip external URLs
  55                 $uc = "A-Za-z0-9_\\/:.,~%\\-+&;#?!=()@\\xA0-\\xFF";
  56                 $protos = "http|https|ftp|mailto|news|gopher";
  57                 $pat = "/(^|[^\\[])({$protos}):[{$uc}]+([^{$uc}]|$)/";
  58                 $text = preg_replace( $pat, "\\1 \\3", $text );
  59
  60                 $p1 = "/([^\\[])\\[({$protos}):[{$uc}]+]/";
  61                 $p2 = "/([^\\[])\\[({$protos}):[{$uc}]+\\s+([^\\]]+)]/";
  62                 $text = preg_replace( $p1, "\\1 ", $text );
  63                 $text = preg_replace( $p2, "\\1 \\3 ", $text );
  64
  65                 # Internal image links
  66                 $pat2 = "/\\[\\[image:([{$uc}]+)\\.(gif|png|jpg|jpeg)([^{$uc}])/i";
  67                 $text = preg_replace( $pat2, " \\1 \\3", $text );
  68
  69                 $text = preg_replace( "/([^{$lc}])([{$lc}]+)]]([a-z]+)/",
  70                   "\\1\\2 \\2\\3", $text ); # Handle [[game]]s
  71
  72                 # Strip all remaining non-search characters
  73                 $text = preg_replace( "/[^{$lc}]+/", " ", $text );
  74
  75                 # Handle 's, s'
  76                 #
  77                 #   $text = preg_replace( "/([{$lc}]+)'s /", "\\1 \\1's ", $text );
  78                 #   $text = preg_replace( "/([{$lc}]+)s' /", "\\1s ", $text );
  79                 #
  80                 # These tail-anchored regexps are insanely slow. The worst case comes
  81                 # when Japanese or Chinese text (ie, no word spacing) is written on
  82                 # a wiki configured for Western UTF-8 mode. The Unicode characters are
  83                 # expanded to hex codes and the "words" are very long paragraph-length
  84                 # monstrosities. On a large page the above regexps may take over 20
  85                 # seconds *each* on a 1GHz-level processor.
  86                 #
  87                 # Following are reversed versions which are consistently fast
  88                 # (about 3 milliseconds on 1GHz-level processor).
  89                 #
  90                 $text = strrev( preg_replace( "/ s'([{$lc}]+)/", " s'\\1 \\1", strrev( $text ) ) );
  91                 $text = strrev( preg_replace( "/ 's([{$lc}]+)/", " s\\1", strrev( $text ) ) );
  92
  93                 # Strip wiki '' and '''
  94                 $text = preg_replace( "/''[']*/", " ", $text );
  95                 wfProfileOut( "$fname-regexps" );
  96
  97                 wfRunHooks( 'SearchUpdate', array( $this->mId, $this->mNamespace, $this->mTitle, &$text ) );
  98
  99                 # Perform the actual update
 100                 $search->update($this->mId, Title::indexTitle( $this->mNamespace, $this->mTitle ),
 101                                 $text);
 102
 103                 wfProfileOut( $fname );
 104         }
 105 }
 106
 107 /**
 108  * Placeholder class
 109  * @ingroup Search
 110  */
 111 class SearchUpdateMyISAM extends SearchUpdate {
 112         # Inherits everything
 113 }