-function linkToMathImage ( $tex, $outputhash )
-{
- global $wgMathPath;
- return "<img src=\"".$wgMathPath."/".$outputhash.".png\" alt=\"".wfEscapeHTML($tex)."\">";
-}
-
-function renderMath( $tex )
-{
- global $wgUser, $wgMathDirectory, $wgTmpDirectory, $wgInputEncoding;
- $mf = wfMsg( "math_failure" );
- $munk = wfMsg( "math_unknown_error" );
-
- $fname = "renderMath";
-
- $math = $wgUser->getOption("math");
- if ($math == 3)
- return ('$ '.wfEscapeHTML($tex).' $');
-
- $md5 = md5($tex);
- $md5_sql = mysql_escape_string(pack("H32", $md5));
- if ($math == 0)
- $sql = "SELECT math_outputhash FROM math WHERE math_inputhash = '".$md5_sql."'";
- else
- $sql = "SELECT math_outputhash,math_html_conservativeness,math_html FROM math WHERE math_inputhash = '".$md5_sql."'";
-
- $res = wfQuery( $sql, $fname );
- if ( wfNumRows( $res ) == 0 )
- {
- $cmd = "./math/texvc ".escapeshellarg($wgTmpDirectory)." ".
- escapeshellarg($wgMathDirectory)." ".escapeshellarg($tex)." ".escapeshellarg($wgInputEncoding);
- $contents = `$cmd`;
-
- if (strlen($contents) == 0)
- return "<b>".$mf." (".$munk."): ".wfEscapeHTML($tex)."</b>";
- $retval = substr ($contents, 0, 1);
- if (($retval == "C") || ($retval == "M") || ($retval == "L")) {
- if ($retval == "C")
- $conservativeness = 2;
- else if ($retval == "M")
- $conservativeness = 1;
- else
- $conservativeness = 0;
- $outdata = substr ($contents, 33);
-
- $i = strpos($outdata, "\000");
-
- $outhtml = substr($outdata, 0, $i);
- $mathml = substr($outdata, $i+1);
-
- $sql_html = "'".mysql_escape_string($outhtml)."'";
- $sql_mathml = "'".mysql_escape_string($mathml)."'";
- } else if (($retval == "c") || ($retval == "m") || ($retval == "l")) {
- $outhtml = substr ($contents, 33);
- if ($retval == "c")
- $conservativeness = 2;
- else if ($retval == "m")
- $conservativeness = 1;
- else
- $conservativeness = 0;
- $sql_html = "'".mysql_escape_string($outhtml)."'";
- $mathml = '';
- $sql_mathml = 'NULL';
- } else if ($retval == "X") {
- $outhtml = '';
- $mathml = substr ($contents, 33);
- $sql_html = 'NULL';
- $sql_mathml = "'".mysql_escape_string($mathml)."'";
- $conservativeness = 0;
- } else if ($retval == "+") {
- $outhtml = '';
- $mathml = '';
- $sql_html = 'NULL';
- $sql_mathml = 'NULL';
- $conservativeness = 0;
- } else {
- if ($retval == "E")
- $errmsg = wfMsg( "math_lexing_error" );
- else if ($retval == "S")
- $errmsg = wfMsg( "math_syntax_error" );
- else if ($retval == "F")
- $errmsg = wfMsg( "math_unknown_function" );
- else
- $errmsg = $munk;
- return "<h3>".$mf." (".$errmsg.substr($contents, 1)."): ".wfEscapeHTML($tex)."</h3>";
- }
-
- $outmd5 = substr ($contents, 1, 32);
- if (!preg_match("/^[a-f0-9]{32}$/", $outmd5))
- return "<b>".$mf." (".$munk."): ".wfEscapeHTML($tex)."</b>";
-
- $outmd5_sql = mysql_escape_string(pack("H32", $outmd5));
-
- $sql = "REPLACE INTO math VALUES ('".$md5_sql."', '".$outmd5_sql."', ".$conservativeness.", ".$sql_html.", ".$sql_mathml.")";
-
- $res = wfQuery( $sql, $fname );
- # we don't really care if it fails
-
- if (($math == 0) || ($rpage->math_html == '') || (($math == 1) && ($conservativeness != 2)) || (($math == 4) && ($conservativeness == 0)))
- return linkToMathImage($tex, $outmd5);
- else
- return $outhtml;
- } else {
- $rpage = wfFetchObject ( $res );
- $outputhash = unpack( "H32md5", $rpage->math_outputhash . " " );
- $outputhash = $outputhash ['md5'];
-
- if (($math == 0) || ($rpage->math_html == '') || (($math == 1) && ($rpage->math_html_conservativeness != 2)) || (($math == 4) && ($rpage->math_html_conservativeness == 0)))
- return linkToMathImage ( $tex, $outputhash );
- else
- return $rpage->math_html;
- }
-}