"; } function renderMath( $tex ) { global $wgUser, $wgMathDirectory, $wgTmpDirectory, $wgInputEncoding; global $wgTexvc; $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, DB_READ, $fname ); if( $rpage = wfFetchObject ( $res ) ) { $outputhash = unpack( "H32md5", $rpage->math_outputhash . " " ); $outputhash = $outputhash ['md5']; if( file_exists( "$wgMathDirectory/$outputhash.png" ) ) { if (($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; } } } $cmd = $wgTexvc." ". escapeshellarg($wgTmpDirectory)." ". escapeshellarg($wgMathDirectory)." ". escapeshellarg($tex)." ". escapeshellarg($wgInputEncoding); wfDebug( "TeX: $cmd" ); $contents = `$cmd`; if (strlen($contents) == 0) { return "".$mf." (".$munk."): ".wfEscapeHTML($tex).""; } $retval = substr ($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 "