includes/Math.php

   1 <?
   2
   3 function linkToMathImage ( $tex, $outputhash )
   4 {
   5     global $wgMathPath;
   6     return "<img src=\"".$wgMathPath."/".$outputhash.".png\" alt=\"".wfEscapeHTML($tex)."\">";
   7 }
   8
   9 function renderMath( $tex )
  10 {
  11     global $wgUser, $wgMathDirectory, $wgTmpDirectory, $wgInputEncoding;
  12     $mf   = wfMsg( "math_failure" );
  13     $munk = wfMsg( "math_unknown_error" );
  14
  15     $fname = "renderMath";
  16
  17     $math = $wgUser->getOption("math");
  18     if ($math == 3)
  19         return ('$ '.wfEscapeHTML($tex).' $');
  20
  21     $md5 = md5($tex);
  22     $md5_sql = mysql_escape_string(pack("H32", $md5));
  23     if ($math == 0)
  24         $sql = "SELECT math_outputhash FROM math WHERE math_inputhash = '".$md5_sql."'";
  25     else
  26         $sql = "SELECT math_outputhash,math_html_conservativeness,math_html FROM math WHERE math_inputhash = '".$md5_sql."'";
  27
  28     $res = wfQuery( $sql, DB_READ, $fname );
  29     if ( wfNumRows( $res ) == 0 )
  30     {
  31         $cmd = "./math/texvc ".escapeshellarg($wgTmpDirectory)." ".
  32                       escapeshellarg($wgMathDirectory)." ".escapeshellarg($tex)." ".escapeshellarg($wgInputEncoding);
  33         $contents = `$cmd`;
  34
  35         if (strlen($contents) == 0)
  36             return "<b>".$mf." (".$munk."): ".wfEscapeHTML($tex)."</b>";
  37         $retval = substr ($contents, 0, 1);
  38         if (($retval == "C") || ($retval == "M") || ($retval == "L")) {
  39             if ($retval == "C")
  40                 $conservativeness = 2;
  41             else if ($retval == "M")
  42                 $conservativeness = 1;
  43             else
  44                 $conservativeness = 0;
  45             $outdata = substr ($contents, 33);
  46
  47             $i = strpos($outdata, "\000");
  48
  49             $outhtml = substr($outdata, 0, $i);
  50             $mathml = substr($outdata, $i+1);
  51
  52             $sql_html = "'".mysql_escape_string($outhtml)."'";
  53             $sql_mathml = "'".mysql_escape_string($mathml)."'";
  54         } else if (($retval == "c") || ($retval == "m") || ($retval == "l"))  {
  55             $outhtml = substr ($contents, 33);
  56             if ($retval == "c")
  57                 $conservativeness = 2;
  58             else if ($retval == "m")
  59                 $conservativeness = 1;
  60             else
  61                 $conservativeness = 0;
  62             $sql_html = "'".mysql_escape_string($outhtml)."'";
  63             $mathml = '';
  64             $sql_mathml = 'NULL';
  65         } else if ($retval == "X") {
  66             $outhtml = '';
  67             $mathml = substr ($contents, 33);
  68             $sql_html = 'NULL';
  69             $sql_mathml = "'".mysql_escape_string($mathml)."'";
  70             $conservativeness = 0;
  71         } else if ($retval == "+") {
  72             $outhtml = '';
  73             $mathml = '';
  74             $sql_html = 'NULL';
  75             $sql_mathml = 'NULL';
  76             $conservativeness = 0;
  77         } else {
  78             if ($retval == "E")
  79                 $errmsg = wfMsg( "math_lexing_error" );
  80             else if ($retval == "S")
  81                 $errmsg = wfMsg( "math_syntax_error" );
  82             else if ($retval == "F")
  83                 $errmsg = wfMsg( "math_unknown_function" );
  84             else
  85                 $errmsg = $munk;
  86             return "<h3>".$mf." (".$errmsg.substr($contents, 1)."): ".wfEscapeHTML($tex)."</h3>";
  87         }
  88
  89         $outmd5 = substr ($contents, 1, 32);
  90         if (!preg_match("/^[a-f0-9]{32}$/", $outmd5))
  91             return "<b>".$mf." (".$munk."): ".wfEscapeHTML($tex)."</b>";
  92
  93         $outmd5_sql = mysql_escape_string(pack("H32", $outmd5));
  94
  95         $sql = "REPLACE INTO math VALUES ('".$md5_sql."', '".$outmd5_sql."', ".$conservativeness.", ".$sql_html.", ".$sql_mathml.")";
  96
  97         $res = wfQuery( $sql, DB_WRITE, $fname );
  98         # we don't really care if it fails
  99
 100         if (($math == 0) || ($rpage->math_html == '') || (($math == 1) && ($conservativeness != 2)) || (($math == 4) && ($conservativeness == 0)))
 101             return linkToMathImage($tex, $outmd5);
 102         else
 103             return $outhtml;
 104     } else {
 105         $rpage = wfFetchObject ( $res );
 106         $outputhash = unpack( "H32md5", $rpage->math_outputhash . "                " );
 107         $outputhash = $outputhash ['md5'];
 108
 109         if (($math == 0) || ($rpage->math_html == '') || (($math == 1) && ($rpage->math_html_conservativeness != 2)) || (($math == 4) && ($rpage->math_html_conservativeness == 0)))
 110             return linkToMathImage ( $tex, $outputhash );
 111         else
 112             return $rpage->math_html;
 113     }
 114 }
 115
 116 ?>