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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 2018 Jean-Michel Vedrine
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
define('AJAX_SCRIPT', true);
require_once(__DIR__ . '/../../../config.php');
require_once(__DIR__ . '/parser.php');
$p = new qtype_algebra_parser;
$vars = required_param('vars', PARAM_RAW);
$expr = required_param('expr', PARAM_RAW);
/*
if (!confirm_sesskey()) {
header('HTTP/1.1 403 Forbidden');
die();
}
*/
try {
$vars = explode(',', $vars);
if (empty($expr)) {
$texexp = ' ';
} else {
$exp = $p->parse($expr, $vars);
$texexp = $exp->tex();
}
} catch (Exception $e) {
$texexp = ' ';
}
$delimiters = $CFG->qtype_algebra_texdelimiters;
switch($delimiters) {
case 'old':
$texexp = '$$' . $texexp . '$$';
break;
case 'new':
$texexp = '\\[' . $texexp . '\\]';
break;
case 'simple';
$texexp = '$' . $texexp . '$';
break;
case 'inline':
$texexp = '\\(' . $texexp . '\\)';
break;
}
header('Content-Type: application/json; charset: utf-8');
echo json_encode($texexp);
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