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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* @package qtype_algebra
* @copyright Roger Moore <rwmoore@ualberta.ca>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
/**
* Script which converts the given formula text into LaTeX code and then
* displays the appropriate image file. It relies on the LaTeX filter or
* the mathJax filter to be present.
*/
require_once('../../../config.php');
require_once("$CFG->dirroot/question/type/algebra/parser.php");
global $PAGE;
require_login();
$p = new qtype_algebra_parser;
$validanswer = true;
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], $vars);
if ($CFG->qtype_algebra_texdelimiters == 'old') {
$texexp = '$$'.$exp->tex().'$$';
} else {
$texexp = '\['.$exp->tex().'\]';
}
}
} catch (Exception $e) {
$validanswer = false;
$texexp = get_string('parseerror', 'qtype_algebra', $e->getMessage());
}
$formatoptions = new stdClass;
$formatoptions->para = false;
$PAGE->set_context(context_system::instance());
if ($validanswer) {
$text = format_text($texexp, FORMAT_MOODLE, $formatoptions);
} else {
$text = get_string('invalidanswer', 'qtype_algebra');
}
?>
<html>
<head>
<title>Formula</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<?php
if (!empty($CFG->additionalhtmlhead) && stripos($CFG->additionalhtmlhead, 'MathJax') !== false) {
// For website where Mathjax is enabled using additional HTML in head.
echo $CFG->additionalhtmlhead;
} else {
// For other website directly include MathJax.
echo "<script type=\"text/javascript\" async
src=\"https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-MML-AM_CHTML\">
</script>";
}
?>
</head>
<body bgcolor="#ffffff">
<?php echo $text; ?>
</body>
</html>
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