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<?php
// Moodle algebra question type class
// Author: Roger Moore <rwmoore 'at' ualberta.ca>
// License: GNU Public License version 3
/**
* Script which converts the given formula text into LaTeX code and then
* displays the appropriate image file. It relies on the LaTeX filter to
* be present.
*/
require_once('../../../config.php');
require_once("$CFG->dirroot/question/type/algebra/parser.php");
global $PAGE;
$p = new qtype_algebra_parser;
try {
$query=urldecode($_SERVER['QUERY_STRING']);
$m=array();
if(!preg_match('/vars=([^&]*)&expr=(.*)$/A',$query,$m)) {
throw new Exception('Invalid query string received from http server!');
}
$vars=explode(',',$m[1]);
if(empty($m[2])) {
$texexp='';
} else {
$exp = $p->parse($m[2],$vars);
$texexp = '$$'.$exp->tex().'$$';
}
} catch(Exception $e) {
$texexp = get_string('parseerror','qtype_algebra',$e->getMessage());
}
$formatoptions = new stdClass;
$formatoptions->para = false;
$PAGE->set_context(get_context_instance(CONTEXT_SYSTEM));
$text = format_text($texexp, FORMAT_MOODLE, $formatoptions);
?>
<html>
<head>
<title>Formula</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
</head>
<body bgcolor="#FFFFFF">
<?php echo $text; ?>
</body>
</html>
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