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<?php
#
# Takes LaTeX fragments, sends them to a helper program (texvc) for rendering
# to rasterized PNG and HTML and MathML approximations. An appropriate
# rendering form is picked and returned.
#
# by Tomasz Wegrzanowski, with additions by Brion Vibber (2003, 2004)
#
class MathRenderer {
var $mode = MW_MATH_MODERN;
var $tex = "";
var $inputhash = "";
var $hash = "";
var $html = "";
var $mathml = "";
var $conservativeness = 0;
function MathRenderer( $tex ) {
$this->tex = $tex;
}
function setOutputMode( $mode ) {
$this->mode = $mode;
}
function render() {
global $wgMathDirectory, $wgTmpDirectory, $wgInputEncoding;
global $wgTexvc;
if( $this->mode == MW_MATH_SOURCE ) {
# No need to render or parse anything more!
return ('$ '.htmlspecialchars( $this->tex ).' $');
}
if( !$this->_recall() ) {
# Ensure that the temp and output directories are available before continuing...
if( !file_exists( $wgMathDirectory ) ) {
if( !@mkdir( $wgMathDirectory ) ) {
return $this->_error( "math_bad_output" );
}
} elseif( !is_dir( $wgMathDirectory ) || !is_writable( $wgMathDirectory ) ) {
return $this->_error( "math_bad_output" );
}
if( !file_exists( $wgTmpDirectory ) ) {
if( !@mkdir( $wgTmpDirectory ) ) {
return $this->_error( "math_bad_tmpdir" );
}
} elseif( !is_dir( $wgTmpDirectory ) || !is_writable( $wgTmpDirectory ) ) {
return $this->_error( "math_bad_tmpdir" );
}
if( !is_executable( $wgTexvc ) ) {
return $this->_error( "math_notexvc" );
}
$cmd = $wgTexvc." ".
escapeshellarg($wgTmpDirectory)." ".
escapeshellarg($wgMathDirectory)." ".
escapeshellarg($this->tex)." ".
escapeshellarg($wgInputEncoding);
wfDebug( "TeX: $cmd" );
$contents = `$cmd`;
if (strlen($contents) == 0) {
return $this->_error( "math_unknown_error" );
}
$retval = substr ($contents, 0, 1);
if (($retval == "C") || ($retval == "M") || ($retval == "L")) {
if ($retval == "C")
$this->conservativeness = 2;
else if ($retval == "M")
$this->conservativeness = 1;
else
$this->conservativeness = 0;
$outdata = substr ($contents, 33);
$i = strpos($outdata, "\000");
$this->html = substr($outdata, 0, $i);
$this->mathml = substr($outdata, $i+1);
$sql_html = "'".wfStrencode($this->html)."'";
$sql_mathml = "'".wfStrencode($this->mathml)."'";
} else if (($retval == "c") || ($retval == "m") || ($retval == "l")) {
$this->html = substr ($contents, 33);
if ($retval == "c")
$this->conservativeness = 2;
else if ($retval == "m")
$this->conservativeness = 1;
else
$this->conservativeness = 0;
$sql_html = "'".wfStrencode($this->html)."'";
$this->mathml = '';
$sql_mathml = 'NULL';
} else if ($retval == "X") {
$outhtml = '';
$this->mathml = substr ($contents, 33);
$sql_html = 'NULL';
$sql_mathml = "'".wfStrencode($this->mathml)."'";
$this->conservativeness = 0;
} else if ($retval == "+") {
$this->outhtml = '';
$this->mathml = '';
$sql_html = 'NULL';
$sql_mathml = 'NULL';
$this->conservativeness = 0;
} else {
$errbit = htmlspecialchars( substr($contents, 1) );
switch( $retval ) {
case "E": return $this->_error( "math_lexing_error", $errbit );
case "S": return $this->_error( "math_syntax_error", $errbit );
case "F": return $this->_error( "math_unknown_function", $errbit );
default: return $this->_error( "math_unknown_error", $errbit );
}
}
$this->hash = substr ($contents, 1, 32);
if (!preg_match("/^[a-f0-9]{32}$/", $this->hash)) {
return $this->_error( "math_unknown_error" );
}
if( !file_exists( "$wgMathDirectory/{$this->hash}.png" ) ) {
return $this->_error( "math_image_error" );
}
# Now save it back to the DB:
$outmd5_sql = wfStrencode(pack("H32", $this->hash));
$md5_sql = wfStrencode( pack("H32", $this->md5) ); # Binary packed, not hex
$sql = "REPLACE INTO math VALUES ('".$md5_sql."', '".$outmd5_sql."', ".$this->conservativeness.", ".$sql_html.", ".$sql_mathml.")";
$res = wfQuery( $sql, DB_WRITE, "MathRenderer::render" );
# we don't really care if it fails
}
return $this->_doRender();
}
function _error( $msg, $append = "" ) {
$mf = htmlspecialchars( wfMsg( "math_failure" ) );
$munk = htmlspecialchars( wfMsg( "math_unknown_error" ) );
$errmsg = htmlspecialchars( wfMsg( $msg ) );
$source = htmlspecialchars($this->tex);
return "<strong class='error'>$mf ($errmsg$append): $source</strong>\n";
}
function _recall() {
global $wgMathDirectory;
$this->md5 = md5( $this->tex );
$md5_sql = wfStrencode( pack("H32", $this->md5) ); # Binary packed, not hex
$sql = "SELECT math_outputhash,math_html_conservativeness,math_html,math_mathml FROM math WHERE math_inputhash = '$md5_sql'";
$res = wfQuery( $sql, DB_READ, "MathRenderer::_recall" );
if( $rpage = wfFetchObject ( $res ) ) {
# Tailing 0x20s can get dropped by the database, add it back on if necessary:
$xhash = unpack( "H32md5", $rpage->math_outputhash . " " );
$this->hash = $xhash ['md5'];
$this->conservativeness = $rpage->math_html_conservativeness;
$this->html = $rpage->math_html;
$this->mathml = $rpage->math_mathml;
if( file_exists( "$wgMathDirectory/{$this->hash}.png" ) ) {
return true;
}
}
# Missing from the database and/or the render cache
return false;
}
# Select among PNG, HTML, or MathML output depending on
function _doRender() {
if( $this->mode == MW_MATH_MATHML && $this->mathml != '' ) {
return "<math xmlns='http://www.w3.org/1998/Math/MathML'>{$this->mathml}</math>";
}
if (($this->mode == MW_MATH_PNG) || ($this->html == '') ||
(($this->mode == MW_MATH_SIMPLE) && ($this->conservativeness != 2)) ||
(($this->mode == MW_MATH_MODERN || $this->mode == MW_MATH_MATHML) && ($this->conservativeness == 0))) {
return $this->_linkToMathImage();
} else {
return '<span class="texhtml">'.$this->html.'</span>';
}
}
function _linkToMathImage() {
global $wgMathPath;
$url = htmlspecialchars( "$wgMathPath/{$this->hash}.png" );
$alt = trim(str_replace("\n", ' ', htmlspecialchars( $this->tex )));
return "<img class='tex' src=\"$url\" alt=\"$alt\" />";
}
}
function renderMath( $tex ) {
global $wgUser;
$math = new MathRenderer( $tex );
$math->setOutputMode( $wgUser->getOption("math"));
return $math->render();
}
?>
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