/lib/formslib.php

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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/>.

/**
 * formslib.php - library of classes for creating forms in Moodle, based on PEAR QuickForms.
 *
 * To use formslib then you will want to create a new file purpose_form.php eg. edit_form.php
 * and you want to name your class something like {modulename}_{purpose}_form. Your class will
 * extend moodleform overriding abstract classes definition and optionally defintion_after_data
 * and validation.
 *
 * See examples of use of this library in course/edit.php and course/edit_form.php
 *
 * A few notes :
 *      form definition is used for both printing of form and processing and should be the same
 *              for both or you may lose some submitted data which won't be let through.
 *      you should be using setType for every form element except select, radio or checkbox
 *              elements, these elements clean themselves.
 *
 *
 * @copyright  Jamie Pratt <me@jamiep.org>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @package    core
 * @subpackage form
 */

defined('MOODLE_INTERNAL') || die();

/** setup.php includes our hacked pear libs first */
require_once 'HTML/QuickForm.php';
require_once 'HTML/QuickForm/DHTMLRulesTableless.php';
require_once 'HTML/QuickForm/Renderer/Tableless.php';

require_once $CFG->libdir.'/filelib.php';

define('EDITOR_UNLIMITED_FILES', -1);

/**
 * Callback called when PEAR throws an error
 *
 * @param PEAR_Error $error
 */
function pear_handle_error($error){
    echo '<strong>'.$error->GetMessage().'</strong> '.$error->getUserInfo();
    echo '<br /> <strong>Backtrace </strong>:';
    print_object($error->backtrace);
}

if (!empty($CFG->debug) and $CFG->debug >= DEBUG_ALL){
    PEAR::setErrorHandling(PEAR_ERROR_CALLBACK, 'pear_handle_error');
}

/**
 *
 * @staticvar bool $done
 * @global moodle_page $PAGE
 */
function form_init_date_js() {
    global $PAGE;
    static $done = false;
    if (!$done) {
        $module   = 'moodle-form-dateselector';
        $function = 'M.form.dateselector.init_date_selectors';
        $config = array(array('firstdayofweek'=>get_string('firstdayofweek', 'langconfig')));
        $PAGE->requires->yui_module($module, $function, $config);
        $done = true;
    }
}

/**
 * Moodle specific wrapper that separates quickforms syntax from moodle code. You won't directly
 * use this class you should write a class definition which extends this class or a more specific
 * subclass such a moodleform_mod for each form you want to display and/or process with formslib.
 *
 * You will write your own definition() method which performs the form set up.
 *
 * @package   moodlecore
 * @copyright Jamie Pratt <me@jamiep.org>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
abstract class moodleform {
    /** @var string */
    protected $_formname;       // form name
    /**
     * quickform object definition
     *
     * @var MoodleQuickForm MoodleQuickForm
     */
    protected $_form;
    /**
     * globals workaround
     *
     * @var array
     */
    protected $_customdata;
    /**
     * definition_after_data executed flag
     * @var object definition_finalized
     */
    protected $_definition_finalized = false;

    /**
     * The constructor function calls the abstract function definition() and it will then
     * process and clean and attempt to validate incoming data.
     *
     * It will call your custom validate method to validate data and will also check any rules
     * you have specified in definition using addRule
     *
     * The name of the form (id attribute of the form) is automatically generated depending on
     * the name you gave the class extending moodleform. You should call your class something
     * like
     *
     * @param mixed $action the action attribute for the form. If empty defaults to auto detect the
     *                  current url. If a moodle_url object then outputs params as hidden variables.
     * @param array $customdata if your form defintion method needs access to data such as $course
     *               $cm, etc. to construct the form definition then pass it in this array. You can
     *               use globals for somethings.
     * @param string $method if you set this to anything other than 'post' then _GET and _POST will
     *               be merged and used as incoming data to the form.
     * @param string $target target frame for form submission. You will rarely use this. Don't use
     *                  it if you don't need to as the target attribute is deprecated in xhtml
     *                  strict.
     * @param mixed $attributes you can pass a string of html attributes here or an array.
     * @param bool $editable
     * @return object moodleform
     */
    function moodleform($action=null, $customdata=null, $method='post', $target='', $attributes=null, $editable=true) {
        if (empty($action)){
            $action = strip_querystring(qualified_me());
        }

        $this->_formname = get_class($this); // '_form' suffix kept in order to prevent collisions of form id and other element
        $this->_customdata = $customdata;
        $this->_form = new MoodleQuickForm($this->_formname, $method, $action, $target, $attributes);
        if (!$editable){
            $this->_form->hardFreeze();
        }

        $this->definition();

        $this->_form->addElement('hidden', 'sesskey', null); // automatic sesskey protection
        $this->_form->setType('sesskey', PARAM_RAW);
        $this->_form->setDefault('sesskey', sesskey());
        $this->_form->addElement('hidden', '_qf__'.$this->_formname, null);   // form submission marker
        $this->_form->setType('_qf__'.$this->_formname, PARAM_RAW);
        $this->_form->setDefault('_qf__'.$this->_formname, 1);
        $this->_form->_setDefaultRuleMessages();

        // we have to know all input types before processing submission ;-)
        $this->_process_submission($method);
    }

    /**
     * To autofocus on first form element or first element with error.
     *
     * @param string $name if this is set then the focus is forced to a field with this name
     *
     * @return string  javascript to select form element with first error or
     *                  first element if no errors. Use this as a parameter
     *                  when calling print_header
     */
    function focus($name=NULL) {
        $form =& $this->_form;
        $elkeys = array_keys($form->_elementIndex);
        $error = false;
        if (isset($form->_errors) &&  0 != count($form->_errors)){
            $errorkeys = array_keys($form->_errors);
            $elkeys = array_intersect($elkeys, $errorkeys);
            $error = true;
        }

        if ($error or empty($name)) {
            $names = array();
            while (empty($names) and !empty($elkeys)) {
                $el = array_shift($elkeys);
                $names = $form->_getElNamesRecursive($el);
            }
            if (!empty($names)) {
                $name = array_shift($names);
            }
        }

        $focus = '';
        if (!empty($name)) {
            $focus = 'forms[\''.$form->getAttribute('id').'\'].elements[\''.$name.'\']';
        }

        return $focus;
     }

    /**
     * Internal method. Alters submitted data to be suitable for quickforms processing.
     * Must be called when the form is fully set up.
     *
     * @param string $method
     */
    function _process_submission($method) {
        $submission = array();
        if ($method == 'post') {
            if (!empty($_POST)) {
                $submission = $_POST;
            }
        } else {
            $submission = array_merge_recursive($_GET, $_POST); // emulate handling of parameters in xxxx_param()
        }

        // following trick is needed to enable proper sesskey checks when using GET forms
        // the _qf__.$this->_formname serves as a marker that form was actually submitted
        if (array_key_exists('_qf__'.$this->_formname, $submission) and $submission['_qf__'.$this->_formname] == 1) {
            if (!confirm_sesskey()) {
                print_error('invalidsesskey');
            }
            $files = $_FILES;
        } else {
            $submission = array();
            $files = array();
        }

        $this->_form->updateSubmission($submission, $files);
    }

    /**
     * Internal method. Validates all old-style deprecated uploaded files.
     * The new way is to upload files via repository api.
     *
     * @global object
     * @global object
     * @param array $files
     * @return bool|array Success or an array of errors
     */
    function _validate_files(&$files) {
        global $CFG, $COURSE;

        $files = array();

        if (empty($_FILES)) {
            // we do not need to do any checks because no files were submitted
            // note: server side rules do not work for files - use custom verification in validate() instead
            return true;
        }

        $errors = array();
        $filenames = array();

        // now check that we really want each file
        foreach ($_FILES as $elname=>$file) {
            $required = $this->_form->isElementRequired($elname);

            if ($file['error'] == 4 and $file['size'] == 0) {
                if ($required) {
                    $errors[$elname] = get_string('required');
                }
                unset($_FILES[$elname]);
                continue;
            }

            if (!empty($file['error'])) {
                $errors[$elname] = file_get_upload_error($file['error']);
                unset($_FILES[$elname]);
                continue;
            }

            if (!is_uploaded_file($file['tmp_name'])) {
                // TODO: improve error message
                $errors[$elname] = get_string('error');
                unset($_FILES[$elname]);
                continue;
            }

            if (!$this->_form->elementExists($elname) or !$this->_form->getElementType($elname)=='file') {
                // hmm, this file was not requested
                unset($_FILES[$elname]);
                continue;
            }

/*
  // TODO: rethink the file scanning MDL-19380
            if ($CFG->runclamonupload) {
                if (!clam_scan_moodle_file($_FILES[$elname], $COURSE)) {
                    $errors[$elname] = $_FILES[$elname]['uploadlog'];
                    unset($_FILES[$elname]);
                    continue;
                }
            }
*/
            $filename = clean_param($_FILES[$elname]['name'], PARAM_FILE);
            if ($filename === '') {
                // TODO: improve error message - wrong chars
                $errors[$elname] = get_string('error');
                unset($_FILES[$elname]);
                continue;
            }
            if (in_array($filename, $filenames)) {
                // TODO: improve error message - duplicate name
                $errors[$elname] = get_string('error');
                unset($_FILES[$elname]);
                continue;
            }
            $filenames[] = $filename;
            $_FILES[$elname]['name'] = $filename;

            $files[$elname] = $_FILES[$elname]['tmp_name'];
        }

        // return errors if found
        if (count($errors) == 0){
            return true;

        } else {
            $files = array();
            return $errors;
        }
    }

    /**
     * Load in existing data as form defaults. Usually new entry defaults are stored directly in
     * form definition (new entry form); this function is used to load in data where values
     * already exist and data is being edited (edit entry form).
     *
     * note: $slashed param removed
     *
     * @param mixed $default_values object or array of default values
     */
    function set_data($default_values) {
        if (is_object($default_values)) {
            $default_values = (array)$default_values;
        }
        $this->_form->setDefaults($default_values);
    }

    /**
     * @deprecated
     */
    function set_upload_manager($um=false) {
        debugging('Old file uploads can not be used any more, please use new filepicker element');
    }

    /**
     * Check that form was submitted. Does not check validity of submitted data.
     *
     * @return bool true if form properly submitted
     */
    function is_submitted() {
        return $this->_form->isSubmitted();
    }

    /**
     * @staticvar bool $nosubmit
     */
    function no_submit_button_pressed(){
        static $nosubmit = null; // one check is enough
        if (!is_null($nosubmit)){
            return $nosubmit;
        }
        $mform =& $this->_form;
        $nosubmit = false;
        if (!$this->is_submitted()){
            return false;
        }
        foreach ($mform->_noSubmitButtons as $nosubmitbutton){
            if (optional_param($nosubmitbutton, 0, PARAM_RAW)){
                $nosubmit = true;
                break;
            }
        }
        return $nosubmit;
    }


    /**
     * Check that form data is valid.
     * You should almost always use this, rather than {@see validate_defined_fields}
     *
     * @staticvar bool $validated
     * @return bool true if form data valid
     */
    function is_validated() {
        //finalize the form definition before any processing
        if (!$this->_definition_finalized) {
            $this->_definition_finalized = true;
            $this->definition_after_data();
        }

        return $this->validate_defined_fields();
    }

    /**
     * Validate the form.
     *
     * You almost always want to call {@see is_validated} instead of this
     * because it calls {@see definition_after_data} first, before validating the form,
     * which is what you want in 99% of cases.
     *
     * This is provided as a separate function for those special cases where
     * you want the form validated before definition_after_data is called
     * for example, to selectively add new elements depending on a no_submit_button press,
     * but only when the form is valid when the no_submit_button is pressed,
     *
     * @param boolean $validateonnosubmit optional, defaults to false.  The default behaviour
     *                is NOT to validate the form when a no submit button has been pressed.
     *                pass true here to override this behaviour
     *
     * @return bool true if form data valid
     */
    function validate_defined_fields($validateonnosubmit=false) {
        static $validated = null; // one validation is enough
        $mform =& $this->_form;
        if ($this->no_submit_button_pressed() && empty($validateonnosubmit)){
            return false;
        } elseif ($validated === null) {
            $internal_val = $mform->validate();

            $files = array();
            $file_val = $this->_validate_files($files);
            if ($file_val !== true) {
                if (!empty($file_val)) {
                    foreach ($file_val as $element=>$msg) {
                        $mform->setElementError($element, $msg);
                    }
                }
                $file_val = false;
            }

            $data = $mform->exportValues();
            $moodle_val = $this->validation($data, $files);
            if ((is_array($moodle_val) && count($moodle_val)!==0)) {
                // non-empty array means errors
                foreach ($moodle_val as $element=>$msg) {
                    $mform->setElementError($element, $msg);
                }
                $moodle_val = false;

            } else {
                // anything else means validation ok
                $moodle_val = true;
            }

            $validated = ($internal_val and $moodle_val and $file_val);
        }
        return $validated;
    }

    /**
     * Return true if a cancel button has been pressed resulting in the form being submitted.
     *
     * @return boolean true if a cancel button has been pressed
     */
    function is_cancelled(){
        $mform =& $this->_form;
        if ($mform->isSubmitted()){
            foreach ($mform->_cancelButtons as $cancelbutton){
                if (optional_param($cancelbutton, 0, PARAM_RAW)){
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * Return submitted data if properly submitted or returns NULL if validation fails or
     * if there is no submitted data.
     *
     * note: $slashed param removed
     *
     * @return object submitted data; NULL if not valid or not submitted
     */
    function get_data() {
        $mform =& $this->_form;

        if ($this->is_submitted() and $this->is_validated()) {
            $data = $mform->exportValues();
            unset($data['sesskey']); // we do not need to return sesskey
            unset($data['_qf__'.$this->_formname]);   // we do not need the submission marker too
            if (empty($data)) {
                return NULL;
            } else {
                return (object)$data;
            }
        } else {
            return NULL;
        }
    }

    /**
     * Return submitted data without validation or NULL if there is no submitted data.
     * note: $slashed param removed
     *
     * @return object submitted data; NULL if not submitted
     */
    function get_submitted_data() {
        $mform =& $this->_form;

        if ($this->is_submitted()) {
            $data = $mform->exportValues();
            unset($data['sesskey']); // we do not need to return sesskey
            unset($data['_qf__'.$this->_formname]);   // we do not need the submission marker too
            if (empty($data)) {
                return NULL;
            } else {
                return (object)$data;
            }
        } else {
            return NULL;
        }
    }

    /**
     * Save verified uploaded files into directory. Upload process can be customised from definition()
     * NOTE: please use save_stored_file() or save_file()
     *
     * @return bool Always false
     */
    function save_files($destination) {
        debugging('Not used anymore, please fix code! Use save_stored_file() or save_file() instead');
        return false;
    }

    /**
     * Returns name of uploaded file.
     *
     * @global object
     * @param string $elname, first element if null
     * @return mixed false in case of failure, string if ok
     */
    function get_new_filename($elname=null) {
        global $USER;

        if (!$this->is_submitted() or !$this->is_validated()) {
            return false;
        }

        if (is_null($elname)) {
            if (empty($_FILES)) {
                return false;
            }
            reset($_FILES);
            $elname = key($_FILES);
        }

        if (empty($elname)) {
            return false;
        }

        $element = $this->_form->getElement($elname);

        if ($element instanceof MoodleQuickForm_filepicker || $element instanceof MoodleQuickForm_filemanager) {
            $values = $this->_form->exportValues($elname);
            if (empty($values[$elname])) {
                return false;
            }
            $draftid = $values[$elname];
            $fs = get_file_storage();
            $context = get_context_instance(CONTEXT_USER, $USER->id);
            if (!$files = $fs->get_area_files($context->id, 'user', 'draft', $draftid, 'id DESC', false)) {
                return false;
            }
            $file = reset($files);
            return $file->get_filename();
        }

        if (!isset($_FILES[$elname])) {
            return false;
        }

        return $_FILES[$elname]['name'];
    }

    /**
     * Save file to standard filesystem
     *
     * @global object
     * @param string $elname name of element
     * @param string $pathname full path name of file
     * @param bool $override override file if exists
     * @return bool success
     */
    function save_file($elname, $pathname, $override=false) {
        global $USER;

        if (!$this->is_submitted() or !$this->is_validated()) {
            return false;
        }
        if (file_exists($pathname)) {
            if ($override) {
                if (!@unlink($pathname)) {
                    return false;
                }
            } else {
                return false;
            }
        }

        $element = $this->_form->getElement($elname);

        if ($element instanceof MoodleQuickForm_filepicker || $element instanceof MoodleQuickForm_filemanager) {
            $values = $this->_form->exportValues($elname);
            if (empty($values[$elname])) {
                return false;
            }
            $draftid = $values[$elname];
            $fs = get_file_storage();
            $context = get_context_instance(CONTEXT_USER, $USER->id);
            if (!$files = $fs->get_area_files($context->id, 'user', 'draft', $draftid, 'id DESC', false)) {
                return false;
            }
            $file = reset($files);

            return $file->copy_content_to($pathname);

        } else if (isset($_FILES[$elname])) {
            return copy($_FILES[$elname]['tmp_name'], $pathname);
        }

        return false;
    }

    /**
     * Returns a temporary file, do not forget to delete after not needed any more.
     *
     * @param string $elname
     * @return string or false
     */
    function save_temp_file($elname) {
        if (!$this->get_new_filename($elname)) {
            return false;
        }
        if (!$dir = make_upload_directory('temp/forms')) {
            return false;
        }
        if (!$tempfile = tempnam($dir, 'tempup_')) {
            return false;
        }
        if (!$this->save_file($elname, $tempfile, true)) {
            // something went wrong
            @unlink($tempfile);
            return false;
        }

        return $tempfile;
    }

    /**
     * Get draft files of a form element
     * This is a protected method which will be used only inside moodleforms
     *
     * @global object $USER
     * @param string $elname name of element
     * @return array
     */
    protected function get_draft_files($elname) {
        global $USER;

        if (!$this->is_submitted()) {
            return false;
        }

        $element = $this->_form->getElement($elname);

        if ($element instanceof MoodleQuickForm_filepicker || $element instanceof MoodleQuickForm_filemanager) {
            $values = $this->_form->exportValues($elname);
            if (empty($values[$elname])) {
                return false;
            }
            $draftid = $values[$elname];
            $fs = get_file_storage();
            $context = get_context_instance(CONTEXT_USER, $USER->id);
            if (!$files = $fs->get_area_files($context->id, 'user', 'draft', $draftid, 'id DESC', false)) {
                return null;
            }
            return $files;
        }
        return null;
    }

    /**
     * Save file to local filesystem pool
     *
     * @global object
     * @param string $elname name of element
     * @param int $newcontextid
     * @param string $newfilearea
     * @param string $newfilepath
     * @param string $newfilename - use specified filename, if not specified name of uploaded file used
     * @param bool $overwrite  - overwrite file if exists
     * @param int $newuserid - new userid if required
     * @return mixed stored_file object or false if error; may throw exception if duplicate found
     */
    function save_stored_file($elname, $newcontextid, $newcomponent, $newfilearea, $newitemid, $newfilepath='/',
                              $newfilename=null, $overwrite=false, $newuserid=null) {
        global $USER;

        if (!$this->is_submitted() or !$this->is_validated()) {
            return false;
        }

        if (empty($newuserid)) {
            $newuserid = $USER->id;
        }

        $element = $this->_form->getElement($elname);
        $fs = get_file_storage();

        if ($element instanceof MoodleQuickForm_filepicker) {
            $values = $this->_form->exportValues($elname);
            if (empty($values[$elname])) {
                return false;
            }
            $draftid = $values[$elname];
            $context = get_context_instance(CONTEXT_USER, $USER->id);
            if (!$files = $fs->get_area_files($context->id, 'user' ,'draft', $draftid, 'id DESC', false)) {
                return false;
            }
            $file = reset($files);
            if (is_null($newfilename)) {
                $newfilename = $file->get_filename();
            }

            if ($overwrite) {
                if ($oldfile = $fs->get_file($newcontextid, $newcomponent, $newfilearea, $newitemid, $newfilepath, $newfilename)) {
                    if (!$oldfile->delete()) {
                        return false;
                    }
                }
            }

            $file_record = array('contextid'=>$newcontextid, 'component'=>$newcomponent, 'filearea'=>$newfilearea, 'itemid'=>$newitemid,
                                 'filepath'=>$newfilepath, 'filename'=>$newfilename, 'userid'=>$newuserid);
            return $fs->create_file_from_storedfile($file_record, $file);

        } else if (isset($_FILES[$elname])) {
            $filename = is_null($newfilename) ? $_FILES[$elname]['name'] : $newfilename;

            if ($overwrite) {
                if ($oldfile = $fs->get_file($newcontextid, $newcomponent, $newfilearea, $newitemid, $newfilepath, $newfilename)) {
                    if (!$oldfile->delete()) {
                        return false;
                    }
                }
            }

            $file_record = array('contextid'=>$newcontextid, 'component'=>$newcomponent, 'filearea'=>$newfilearea, 'itemid'=>$newitemid,
                                 'filepath'=>$newfilepath, 'filename'=>$newfilename, 'userid'=>$newuserid);
            return $fs->create_file_from_pathname($file_record, $_FILES[$elname]['tmp_name']);
        }

        return false;
    }

    /**
     * Get content of uploaded file.
     *
     * @global object
     * @param $element name of file upload element
     * @return mixed false in case of failure, string if ok
     */
    function get_file_content($elname) {
        global $USER;

        if (!$this->is_submitted() or !$this->is_validated()) {
            return false;
        }

        $element = $this->_form->getElement($elname);

        if ($element instanceof MoodleQuickForm_filepicker || $element instanceof MoodleQuickForm_filemanager) {
            $values = $this->_form->exportValues($elname);
            if (empty($values[$elname])) {
                return false;
            }
            $draftid = $values[$elname];
            $fs = get_file_storage();
            $context = get_context_instance(CONTEXT_USER, $USER->id);
            if (!$files = $fs->get_area_files($context->id, 'user', 'draft', $draftid, 'id DESC', false)) {
                return false;
            }
            $file = reset($files);

            return $file->get_content();

        } else if (isset($_FILES[$elname])) {
            return file_get_contents($_FILES[$elname]['tmp_name']);
        }

        return false;
    }

    /**
     * Print html form.
     */
    function display() {
        //finalize the form definition if not yet done
        if (!$this->_definition_finalized) {
            $this->_definition_finalized = true;
            $this->definition_after_data();
        }
        $this->_form->display();
    }

    /**
     * Abstract method - always override!
     */
    protected abstract function definition();

    /**
     * Dummy stub method - override if you need to setup the form depending on current
     * values. This method is called after definition(), data submission and set_data().
     * All form setup that is dependent on form values should go in here.
     */
    function definition_after_data(){
    }

    /**
     * Dummy stub method - override if you needed to perform some extra validation.
     * If there are errors return array of errors ("fieldname"=>"error message"),
     * otherwise true if ok.
     *
     * Server side rules do not work for uploaded files, implement serverside rules here if needed.
     *
     * @param array $data array of ("fieldname"=>value) of submitted data
     * @param array $files array of uploaded files "element_name"=>tmp_file_path
     * @return array of "element_name"=>"error_description" if there are errors,
     *               or an empty array if everything is OK (true allowed for backwards compatibility too).
     */
    function validation($data, $files) {
        return array();
    }

    /**
     * Method to add a repeating group of elements to a form.
     *
     * @param array $elementobjs Array of elements or groups of elements that are to be repeated
     * @param integer $repeats no of times to repeat elements initially
     * @param array $options Array of options to apply to elements. Array keys are element names.
     *                      This is an array of arrays. The second sets of keys are the option types
     *                      for the elements :
     *                          'default' - default value is value
     *                          'type' - PARAM_* constant is value
     *                          'helpbutton' - helpbutton params array is value
     *                          'disabledif' - last three moodleform::disabledIf()
     *                                           params are value as an array
     * @param string $repeathiddenname name for hidden element storing no of repeats in this form
     * @param string $addfieldsname name for button to add more fields
     * @param int $addfieldsno how many fields to add at a time
     * @param string $addstring name of button, {no} is replaced by no of blanks that will be added.
     * @param boolean $addbuttoninside if true, don't call closeHeaderBefore($addfieldsname). Default false.
     * @return int no of repeats of element in this page
     */
    function repeat_elements($elementobjs, $repeats, $options, $repeathiddenname,
            $addfieldsname, $addfieldsno=5, $addstring=null, $addbuttoninside=false){
        if ($addstring===null){
            $addstring = get_string('addfields', 'form', $addfieldsno);
        } else {
            $addstring = str_ireplace('{no}', $addfieldsno, $addstring);
        }
        $repeats = optional_param($repeathiddenname, $repeats, PARAM_INT);
        $addfields = optional_param($addfieldsname, '', PARAM_TEXT);
        if (!empty($addfields)){
            $repeats += $addfieldsno;
        }
        $mform =& $this->_form;
        $mform->registerNoSubmitButton($addfieldsname);
        $mform->addElement('hidden', $repeathiddenname, $repeats);
        $mform->setType($repeathiddenname, PARAM_INT);
        //value not to be overridden by submitted value
        $mform->setConstants(array($repeathiddenname=>$repeats));
        $namecloned = array();
        for ($i = 0; $i < $repeats; $i++) {
            foreach ($elementobjs as $elementobj){
                $elementclone = fullclone($elementobj);
                $name = $elementclone->getName();
                $namecloned[] = $name;
                if (!empty($name)) {
                    $elementclone->setName($name."[$i]");
                }
                if (is_a($elementclone, 'HTML_QuickForm_header')) {
                    $value = $elementclone->_text;
                    $elementclone->setValue(str_replace('{no}', ($i+1), $value));

                } else {
                    $value=$elementclone->getLabel();
                    $elementclone->setLabel(str_replace('{no}', ($i+1), $value));

                }

                $mform->addElement($elementclone);
            }
        }
        for ($i=0; $i<$repeats; $i++) {
            foreach ($options as $elementname => $elementoptions){
                $pos=strpos($elementname, '[');
                if ($pos!==FALSE){
                    $realelementname = substr($elementname, 0, $pos+1)."[$i]";
                    $realelementname .= substr($elementname, $pos+1);
                }else {
                    $realelementname = $elementname."[$i]";
                }
                foreach ($elementoptions as  $option => $params){

                    switch ($option){
                        case 'default' :
                            $mform->setDefault($realelementname, $params);
                            break;
                        case 'helpbutton' :
                            $params = array_merge(array($realelementname), $params);
                            call_user_func_array(array(&$mform, 'addHelpButton'), $params);
                            break;
                        case 'disabledif' :
                            foreach ($namecloned as $num => $name){
                                if ($params[0] == $name){
                                    $params[0] = $params[0]."[$i]";
                                    break;
                                }
                            }
                            $params = array_merge(array($realelementname), $params);
                            call_user_func_array(array(&$mform, 'disabledIf'), $params);
                            break;
                        case 'rule' :
                            if (is_string($params)){
                                $params = array(null, $params, null, 'client');
                            }
                            $params = array_merge(array($realelementname), $params);
                            call_user_func_array(array(&$mform, 'addRule'), $params);
                            break;

                    }
                }
            }
        }
        $mform->addElement('submit', $addfieldsname, $addstring);

        if (!$addbuttoninside) {
            $mform->closeHeaderBefore($addfieldsname);
        }

        return $repeats;
    }

    /**
     * Adds a link/button that controls the checked state of a group of checkboxes.
     *
     * @global object
     * @param int    $groupid The id of the group of advcheckboxes this element controls
     * @param string $buttontext The text of the link. Defaults to "select all/none"
     * @param array  $attributes associative array of HTML attributes
     * @param int    $originalValue The original general state of the checkboxes before the user first clicks this element
     */
    function add_checkbox_controller($groupid, $buttontext, $attributes, $originalValue = 0) {
        global $CFG;
        if (empty($text)) {
            $text = get_string('selectallornone', 'form');
        }

        $mform = $this->_form;
        $select_value = optional_param('checkbox_controller'. $groupid, null, PARAM_INT);

        if ($select_value == 0 || is_null($select_value)) {
            $new_select_value = 1;
        } else {
            $new_select_value = 0;
        }

        $mform->addElement('hidden', "checkbox_controller$groupid");
        $mform->setType("checkbox_controller$groupid", PARAM_INT);
        $mform->setConstants(array("checkbox_controller$groupid" => $new_select_value));

        // Locate all checkboxes for this group and set their value, IF the optional param was given
        if (!is_null($select_value)) {
            foreach ($this->_form->_elements as $element) {
                if ($element->getAttribute('class') == "checkboxgroup$groupid") {
                    $mform->setConstants(array($element->getAttribute('name') => $select_value));
                }
            }
        }

        $checkbox_controller_name = 'nosubmit_checkbox_controller' . $groupid;
        $mform->registerNoSubmitButton($checkbox_controller_name);

        // Prepare Javascript for submit element
        $js = "\n//<![CDATA[\n";
        if (!defined('HTML_QUICKFORM_CHECKBOXCONTROLLER_EXISTS')) {
            $js .= <<<EOS
function html_quickform_toggle_checkboxes(group) {
    var checkboxes = getElementsByClassName(document, 'input', 'checkboxgroup' + group);
    var newvalue = false;
    var global = eval('html_quickform_checkboxgroup' + group + ';');
    if (global == 1) {
        eval('html_quickform_checkboxgroup' + group + ' = 0;');
        newvalue = '';
    } else {
        eval('html_quickform_checkboxgroup' + group + ' = 1;');
        newvalue = 'checked';
    }

    for (i = 0; i < checkboxes.length; i++) {
        checkboxes[i].checked = newvalue;
    }
}
EOS;
            define('HTML_QUICKFORM_CHECKBOXCONTROLLER_EXISTS', true);
        }
        $js .= "\nvar html_quickform_checkboxgroup$groupid=$originalValue;\n";

        $js .= "//]]>\n";

        require_once("$CFG->libdir/form/submitlink.php");
        $submitlink = new MoodleQuickForm_submitlink($checkbox_controller_name, $attributes);
        $submitlink->_js = $js;
        $submitlink->_onclick = "html_quickform_toggle_checkboxes($groupid); return false;";
        $mform->addElement($submitlink);
        $mform->setDefault($checkbox_controller_name, $text);
    }

    /**
     * Use this method to a cancel and submit button to the end of your form. Pass a param of false
     * if you don't want a cancel button in your form. If you have a cancel button make sure you
     * check for it being pressed using is_cancelled() and redirecting if it is true before trying to
     * get data with get_data().
     *
     * @param boolean $cancel whether to show cancel button, default true
     * @param string $submitlabel label for submit button, defaults to get_string('savechanges')
     */
    function add_action_buttons($cancel = true, $submitlabel=null){
        if (is_null($submitlabel)){
            $submitlabel = get_string('savechanges');
        }
        $mform =& $this->_form;
        if ($cancel){
            //when two elements we need a group
            $buttonarray=array();
            $buttonarray[] = &$mform->createElement('submit', 'submitbutton', $submitlabel);
            $buttonarray[] = &$mform->createElement('cancel');
            $mform->addGroup($buttonarray, 'buttonar', '', array(' '), false);
            $mform->closeHeaderBefore('buttonar');
        } else {
            //no group needed
            $mform->addElement('submit', 'submitbutton', $submitlabel);
            $mform->closeHeaderBefore('submitbutton');
        }
    }

    /**
     * Adds an initialisation call for a standard JavaScript enhancement.
     *
     * This function is designed to add an initialisation call for a JavaScript
     * enhancement that should exist within javascript-static M.form.init_{enhancementname}.
     *
     * Current options:
     *  - Selectboxes
     *      - smartselect:  Turns a nbsp indented select box into a custom drop down
     *                      control that supports multilevel and category selection.
     *                      $enhancement = 'smartselect';
     *                      $options = array('selectablecategories' => true|false)
     *
     * @since 2.0
     * @param string|element $element
     * @param string $enhancement
     * @param array $options
     * @param array $strings
     */
    function init_javascript_enhancement($element, $enhancement, array $options=array(), array $strings=null) {
        global $PAGE;
        if (is_string($element)) {
            $element = $this->_form->getElement($element);
        }
        if (is_object($element)) {
            $element->_generateId();
            $elementid = $element->getAttribute('id');
            $PAGE->requires->js_init_call('M.form.init_'.$enhancement, array($elementid, $options));
            if (is_array($strings)) {
                foreach ($strings as $string) {
                    if (is_array($string)) {
                        call_user_method_array('string_for_js', $PAGE->requires, $string);
                    } else {
                        $PAGE->requires->string_for_js($string, 'moodle');
                    }
                }
            }
        }
    }

    /**
     * Returns a JS module definition for the mforms JS
     * @return array
     */
    public static function get_js_module() {
        global $CFG;
        return array(
            'name' => 'mform',
            'fullpath' => '/lib/form/form.js',
            'requires' => array('base', 'node'),
            'strings' => array(
                array('showadvanced', 'form'),
                array('hideadvanced', 'form')
            )
        );
    }
}

/**
 * You never extend this class directly. The class methods of this class are available from
 * the private $this->_form property on moodleform and its children. You generally only
 * call methods on this class from within abstract methods that you override on moodleform such
 * as definition and definition_after_data
 *
 * @package   moodlecore
 * @copyright Jamie Pratt <me@jamiep.org>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class MoodleQuickForm extends HTML_QuickForm_DHTMLRulesTableless {
    /** @var array */
    var $_types = array();
    var $_dependencies = array();
    /**
     * Array of buttons that if pressed do not result in the processing of the form.
     *
     * @var array
     */
    var $_noSubmitButtons=array();
    /**
     * Array of buttons that if pressed do not result in the processing of the form.
     *
     * @var array
     */
    var $_cancelButtons=array();

    /**
     * Array whose keys are element names. If the key exists this is a advanced element
     *
     * @var array
     */
    var $_advancedElements = array();

    /**
     * Whether to display advanced elements (on page load)
     *
     * @var boolean
     */
    var $_showAdvanced = null;

    /**
     * The form name is derived from the class name of the wrapper minus the trailing form
     * It is a name with words joined by underscores whereas the id attribute is words joined by
     * underscores.
     *
     * @var unknown_type
     */
    var $_formName = '';

    /**
     * String with the html for hidden params passed in as part of a moodle_url object for the action. Output in the form.
     *
     * @var string
     */
    var $_pageparams = '';

    /**
     * Class constructor - same parameters as HTML_QuickForm_DHTMLRulesTableless
     *
     * @global object
     * @staticvar int $formcounter
     * @param    string      $formName          Form's name.
     * @param    string      $method            (optional)Form's method defaults to 'POST'
     * @param    mixed      $action             (optional)Form's action - string or moodle_url
     * @param    string      $target            (optional)Form's target defaults to none
     * @param    mixed       $attributes        (optional)Extra attributes for <form> tag
     * @access   public
     */
    function MoodleQuickForm($formName, $method, $action, $target='', $attributes=null){
        global $CFG, $OUTPUT;

        static $formcounter = 1;

        HTML_Common::HTML_Common($attributes);
        $target = empty($target) ? array() : array('target' => $target);
        $this->_formName = $formName;
        if (is_a($action, 'moodle_url')){
            $this->_pageparams = html_writer::input_hidden_params($action);
            $action = $action->out_omit_querystring();
        } else {
            $this->_pageparams = '';
        }
        //no 'name' atttribute for form in xhtml strict :
        $attributes = array('action'=>$action, 'method'=>$method,
                'accept-charset'=>'utf-8', 'id'=>'mform'.$formcounter) + $target;
        $formcounter++;
        $this->updateAttributes($attributes);

        //this is custom stuff for Moodle :
        $oldclass=   $this->getAttribute('class');
        if (!empty($oldclass)){
            $this->updateAttributes(array('class'=>$oldclass.' mform'));
        }else {
            $this->updateAttributes(array('class'=>'mform'));
        }
        $this->_reqHTML = '<img class="req" title="'.get_string('requiredelement', 'form').'" alt="'.get_string('requiredelement', 'form').'" src="'.$OUTPUT->pix_url('req') .'" />';
        $this->_advancedHTML = '<img class="adv" title="'.get_string('advancedelement', 'form').'" alt="'.get_string('advancedelement', 'form').'" src="'.$OUTPUT->pix_url('adv') .'" />';
        $this->setRequiredNote(get_string('somefieldsrequired', 'form', '<img alt="'.get_string('requiredelement', 'form').'" src="'.$OUTPUT->pix_url('req') .'" />'));
    }

    /**
     * Use this method to indicate an element in a form is an advanced field. If items in a form
     * are marked as advanced then 'Hide/Show Advanced' buttons will automatically be displayed in the
     * form so the user can decide whether to display advanced form controls.
     *
     * If you set a header element to advanced then all elements it contains will also be set as advanced.
     *
     * @param string $elementName group or element name (not the element name of something inside a group).
     * @param boolean $advanced default true sets the element to advanced. False removes advanced mark.
     */
    function setAdvanced($elementName, $advanced=true){
        if ($advanced){
            $this->_advancedElements[$elementName]='';
        } elseif (isset($this->_advancedElements[$elementName])) {
            unset($this->_advancedElements[$elementName]);
        }
        if ($advanced && $this->getElementType('mform_showadvanced_last')===false){
            $this->setShowAdvanced();
            $this->registerNoSubmitButton('mform_showadvanced');

            $this->addElement('hidden', 'mform_showadvanced_last');
            $this->setType('mform_showadvanced_last', PARAM_INT);
        }
    }
    /**
     * Set whether to show advanced elements in the form on first displaying form. Default is not to
     * display advanced elements in the form until 'Show Advanced' is pressed.
     *
     * You can get the last state of the form and possibly save it for this user by using
     * value 'mform_showadvanced_last' in submitted data.
     *
     * @param boolean $showadvancedNow
     */
    function setShowAdvanced($showadvancedNow = null){
        if ($showadvancedNow === null){
            if ($this->_showAdvanced !== null){
                return;
            } else { //if setShowAdvanced is called without any preference
                     //make the default to not show advanced elements.
                $showadvancedNow = get_user_preferences(
                                moodle_strtolower($this->_formName.'_showadvanced', 0));
            }
        }
        //value of hidden element
        $hiddenLast = optional_param('mform_showadvanced_last', -1, PARAM_INT);
        //value of button
        $buttonPressed = optional_param('mform_showadvanced', 0, PARAM_RAW);
        //toggle if button pressed or else stay the same
        if ($hiddenLast == -1) {
            $next = $showadvancedNow;
        } elseif ($buttonPressed) { //toggle on button press
            $next = !$hiddenLast;
        } else {
            $next = $hiddenLast;
        }
        $this->_showAdvanced = $next;
        if ($showadvancedNow != $next){
            set_user_preference($this->_formName.'_showadvanced', $next);
        }
        $this->setConstants(array('mform_showadvanced_last'=>$next));
    }
    function getShowAdvanced(){
        return $this->_showAdvanced;
    }


   /**
    * Accepts a renderer
    *
    * @param object $renderer HTML_QuickForm_Renderer  An HTML_QuickForm_Renderer object
    * @access public
    * @return void
    */
    function accept(&$renderer) {
        if (method_exists($renderer, 'setAdvancedElements')){
            //check for visible fieldsets where all elements are advanced
            //and mark these headers as advanced as well.
            //And mark all elements in a advanced header as advanced
            $stopFields = $renderer->getStopFieldSetElements();
            $lastHeader = null;
            $lastHeaderAdvanced = false;
            $anyAdvanced = false;
            foreach (array_keys($this->_elements) as $elementIndex){
                $element =& $this->_elements[$elementIndex];

                // if closing header and any contained element was advanced then mark it as advanced
                if ($element->getType()=='header' || in_array($element->getName(), $stopFields)){
                    if ($anyAdvanced && !is_null($lastHeader)){
                        $this->setAdvanced($lastHeader->getName());
                    }
                    $lastHeaderAdvanced = false;
                    unset($lastHeader);
                    $lastHeader = null;
                } elseif ($lastHeaderAdvanced) {
                    $this->setAdvanced($element->getName());
                }

                if ($element->getType()=='header'){
                    $lastHeader =& $element;
                    $anyAdvanced = false;
                    $lastHeaderAdvanced = isset($this->_advancedElements[$element->getName()]);
                } elseif (isset($this->_advancedElements[$element->getName()])){
                    $anyAdvanced = true;
                }
            }
            // the last header may not be closed yet...
            if ($anyAdvanced && !is_nu…

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