C:/xampp/htdocs/moodle/backup/util/ui/backup_moodleform.class.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/>.

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

abstract class backup_moodleform extends base_moodleform {
    public function __construct(backup_ui_stage $uistage, $action = null, $customdata = null, $method = 'post', $target = '', $attributes = null, $editable = true) {
        parent::__construct($uistage, $action, $customdata, $method, $target, $attributes, $editable);
    }
}
class backup_initial_form extends backup_moodleform {}
class backup_schema_form extends backup_moodleform {}
class backup_confirmation_form extends backup_moodleform {

    public function definition_after_data() {
        parent::definition_after_data();
        $this->_form->addRule('setting_root_filename', get_string('errorfilenamerequired', 'backup'), 'required');
        $this->_form->setType('setting_root_filename', PARAM_FILE);
    }

    public function validation($data, $files) {
        $errors = parent::validation($data, $files);

        if (!array_key_exists('setting_root_filename', $errors)) {
            if (trim($data['setting_root_filename']) == '') {
                $errors['setting_root_filename'] = get_string('errorfilenamerequired', 'backup');
            } else if (!preg_match('#\.mbz$#i', $data['setting_root_filename'])) {
                $errors['setting_root_filename'] = get_string('errorfilenamemustbezip', 'backup');
            }
        }

        return $errors;
    }

}