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locallib.php
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locallib.php
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<?php
// This file is part of Stack - http://stack.bham.ac.uk/
//
// Stack 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.
//
// Stack 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 Stack. If not, see <http://www.gnu.org/licenses/>.
require_once(__DIR__ . '/stack/mathsoutput/mathsoutput.class.php');
/**
* Base class for all the types of exception we throw.
*/
class stack_exception extends moodle_exception {
public function __construct($error) {
parent::__construct('exceptionmessage', 'qtype_stack', '', $error);
}
}
/**
* You need to call this method on the string you get from
* $castext->get_display_castext() before you echo it. This ensures that equations
* are displayed properly.
* @param string $castext the result of calling $castext->get_display_castext().
* @return string HTML ready to output.
*/
function stack_ouput_castext($castext) {
return format_text(stack_maths::process_display_castext($castext),
FORMAT_HTML, array('noclean' => true));
}
/**
* Equivalent to get_string($key, 'qtype_stack', $a), but this method ensure that
* any equations in the string are displayed properly.
* @param string $key the string name.
* @param mixed $a (optional) any values to interpolate into the string.
* @return string the language string
*/
function stack_string($key, $a = null) {
return stack_maths::process_lang_string(get_string($key, 'qtype_stack', $a));
}
/**
* Translates a string taken as output from Maxima.
*
* This function takes a variable number of arguments, the first of which is assumed to be the identifier
* of the string to be translated.
*/
function stack_trans() {
$nargs = func_num_args();
if ($nargs > 0) {
$arglist = func_get_args();
$identifier = func_get_arg(0);
$a = array();
if ($nargs > 1) {
for ($i = 1; $i < $nargs; $i++) {
$index = $i - 1;
$a["m{$index}"] = func_get_arg($i);
}
}
$return = stack_string($identifier, $a);
echo $return;
}
}
function stack_maxima_translate($rawfeedback) {
if (strpos($rawfeedback, 'stack_trans') === false) {
return trim($rawfeedback);
} else {
$rawfeedback = str_replace('[[', '', $rawfeedback);
$rawfeedback = str_replace(']]', '', $rawfeedback);
$rawfeedback = str_replace('\n', '', $rawfeedback);
$rawfeedback = str_replace('\\', '\\\\', $rawfeedback);
$rawfeedback = str_replace('!quot!', '"', $rawfeedback);
ob_start();
eval($rawfeedback);
$translated = ob_get_contents();
ob_end_clean();
return trim($translated);
}
}
function stack_maxima_format_casstring($str) {
return html_writer::tag('span', $str, array('class' => 'stacksyntaxexample'));
}
/**
* Used by the questiontest*.php scripts, and deploy.php, to do some initialisation
* that is needed on all of them.
* @return array page context, selected seed (or null), and URL parameters.
*/
function qtype_stack_setup_question_test_page($question) {
global $PAGE;
$seed = optional_param('seed', null, PARAM_INT);
$urlparams = array('questionid' => $question->id);
if (!is_null($seed) && $question->has_random_variants()) {
$urlparams['seed'] = $seed;
}
// Were we given a particular context to run the question in?
// This affects things like filter settings, or forced theme or language.
if ($cmid = optional_param('cmid', 0, PARAM_INT)) {
$cm = get_coursemodule_from_id(false, $cmid);
require_login($cm->course, false, $cm);
$context = context_module::instance($cmid);
$urlparams['cmid'] = $cmid;
} else if ($courseid = optional_param('courseid', 0, PARAM_INT)) {
require_login($courseid);
$context = context_course::instance($courseid);
$urlparams['courseid'] = $courseid;
} else {
require_login();
$context = $question->get_context();
$PAGE->set_context($context);
// Note that in the other cases, require_login will set the correct page context.
}
return array($context, $seed, $urlparams);
}