function linkToMathImage ( $tex, $outputhash )
{
global $wgMathPath;
return "";
}
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 "