... tags to gif images using
// mimetex.cgi obtained from http://www.forkosh.com/mimetex.html authored by
// John Forkosh john@forkosh.com. Several binaries of this areincluded with
// this distribution.
// Note that there may be patent restrictions on the production of gif images
// in Canada and some parts of Western Europe and Japan until July 2004.
//-------------------------------------------------------------------------
/////////////////////////////////////////////////////////////////////////////
// To activate this filter, add a line like this to your //
// list of filters in your Filter configuration: //
// //
// filter/tex/filter.php //
/////////////////////////////////////////////////////////////////////////////
function string_file_picture_tex($imagefile, $tex= "", $height="", $width="", $align="middle", $alt='') {
global $CFG;
if ($alt==='') {
$alt = s($tex);
}
// Work out any necessary inline style.
$rules = array();
if ($align !== 'middle') {
$rules[] = 'vertical-align:' . $align . ';';
}
if ($height) {
$rules[] = 'height:' . $height . 'px;';
}
if ($width) {
$rules[] = 'width:' . $width . 'px;';
}
if (!empty($rules)) {
$style = ' style="' . implode('', $rules) . '" ';
} else {
$style = '';
}
// Prepare the title attribute.
if ($tex) {
$tex = str_replace('&','&',$tex);
$tex = str_replace('<','<',$tex);
$tex = str_replace('>','>',$tex);
$tex = str_replace('"','"',$tex);
$tex = str_replace("\'",''',$tex);
// Note that we retain the title tag as TeX format rather than using
// the alt text, even if supplied. The alt text is intended for blind
// users (to provide a text equivalent to the equation) while the title
// is there as a convenience for sighted users who want to see the TeX
// code.
$title = "title=\"$tex\"";
}
// Build the output.
$output = "";
if ($imagefile) {
if (!file_exists("$CFG->dataroot/filter/tex/$imagefile") && has_capability('moodle/site:config', get_context_instance(CONTEXT_SYSTEM))) {
$output .= "wwwroot/filter/tex/texdebug.php\">";
} else {
$output .= "wwwroot/filter/tex/displaytex.php?";
$output .= urlencode($tex) . "\" onclick=\"return openpopup('/filter/tex/displaytex.php?";
$output .= urlencode($tex) . "', 'popup', 'menubar=0,location=0,scrollbars,";
$output .= "resizable,width=300,height=240', 0);\">";
}
$output .= "![\"$alt\"](\"";)
slasharguments) { // Use this method if possible for better caching
$output .= "$CFG->wwwroot/filter/tex/pix.php/$imagefile";
} else {
$output .= "$CFG->wwwroot/filter/tex/pix.php?file=$imagefile";
}
$output .= "\" $style/>";
$output .= "";
} else {
$output .= "Error: must pass URL or course";
}
return $output;
}
function tex_filter ($courseid, $text) {
global $CFG;
/// Do a quick check using stripos to avoid unnecessary work
if (!preg_match('/discussion);
# } else if (strstr($scriptname,'discuss.php')) {
# $discussion = get_record("forum_discussions","id",$_GET['d'] );
# } else {
# return $text;
# }
# if ($discussion->forum != 130) {
# return $text;
# }
$text .= ' ';
preg_match_all('/\$(\$\$+?)([^\$])/s',$text,$matches);
for ($i=0;$i TeX expression
// or TeX expression
// or $$ TeX expression $$
// or \[ TeX expression \] // original tag of MathType and TeXaide (dlnsk)
// or [tex] TeX expression [/tex] // somtime it's more comfortable than (dlnsk)
preg_match_all('/(.+?)<\/tex>|\$\$(.+?)\$\$|\\\\\[(.+?)\\\\\]|\\[tex\\](.+?)\\[\/tex\\]/is', $text, $matches);
for ($i=0; $i','',$texexp);
$texexp = str_replace('','',$texexp);
$texexp = str_replace('','',$texexp);
$texexp = str_replace('','',$texexp);
$texexp = eregi_replace("", '', $texexp); //dlnsk
$align = "middle";
if (preg_match('/^align=bottom /',$texexp)) {
$align = "text-bottom";
$texexp = preg_replace('/^align=bottom /','',$texexp);
} else if (preg_match('/^align=top /',$texexp)) {
$align = "text-top";
$texexp = preg_replace('/^align=top /','',$texexp);
}
$md5 = md5($texexp);
if (! $texcache = get_record("cache_filters","filter","tex", "md5key", $md5)) {
$texcache->filter = 'tex';
$texcache->version = 1;
$texcache->md5key = $md5;
$texcache->rawtext = addslashes($texexp);
$texcache->timemodified = time();
insert_record("cache_filters",$texcache, false);
}
$filename = $md5 . ".gif";
$text = str_replace( $matches[0][$i], string_file_picture_tex($filename, $texexp, '', '', $align, $alt), $text);
}
return $text;
}
?>