includes/SearchUpdate.php

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