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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/>.

/**
 * XHTML question exporter.
 *
 * @package    qformat_xhtml
 * @copyright  2005 Howard Miller
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

/**
 * XHTML question exporter.
 *
 * Exports questions as static HTML.
 *
 * @copyright  2005 Howard Miller
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class qformat_xhtml extends qformat_default {

public function provide_export() {
        return true;
    }

protected function repchar($text) {
        return $text;
    }

protected function writequestion($question) {
        global $OUTPUT;
        // Turns question into string.
        // Question reflects database fields for general question and specific to type.

// If a category switch, just ignore.
        if ($question->qtype=='category') {
            return '';
        }

// Initial string.
        $expout = "";
        $id = $question->id;

// Add comment and div tags.
        $expout .= "\n";
        $expout .= "<div class=\"question\">\n";

// Add header.
        $expout .= "<h3>{$question->name}</h3>\n";

// Format and add the question text.
        $text = question_rewrite_question_preview_urls($question->questiontext, $question->id,
                $question->contextid, 'question', 'questiontext', $question->id,
                $question->contextid, 'qformat_xhtml');
        $expout .= '<p class="questiontext">' . format_text($text,
                $question->questiontextformat, array('noclean' => true)) . "</p>\n";

// Selection depends on question type.
        switch($question->qtype) {
            case 'truefalse':
                $sttrue = get_string('true', 'qtype_truefalse');
                $stfalse = get_string('false', 'qtype_truefalse');
                $expout .= "<ul class=\"truefalse\">\n";
                $expout .= "  <li><input name=\"quest_{$id}\" type=\"radio\" value=\"{$sttrue}\" />{$sttrue}</li>\n";
                $expout .= "  <li><input name=\"quest_{$id}\" type=\"radio\" value=\"{$stfalse}\" />{$stfalse}</li>\n";
                $expout .= "</ul>\n";
                break;
            case 'multichoice':
                $expout .= "<ul class=\"multichoice\">\n";
                foreach ($question->options->answers as $answer) {
                    $answertext = $this->repchar( $answer->answer );
                    if ($question->options->single) {
                        $expout .= "  <li><input name=\"quest_{$id}\" type=\"radio\" value=\""
                                . s($answertext) . "\" />{$answertext}</li>\n";
                    } else {
                        $expout .= "  <li><input name=\"quest_{$id}\" type=\"checkbox\" value=\""
                                . s($answertext) . "\" />{$answertext}</li>\n";
                    }
                }
                $expout .= "</ul>\n";
                break;
            case 'shortanswer':
                $expout .= html_writer::start_tag('ul', array('class' => 'shortanswer'));
                $expout .= html_writer::start_tag('li');
                $expout .= html_writer::label(get_string('answer'), 'quest_'.$id, false, array('class' => 'accesshide'));
                $expout .= html_writer::empty_tag('input', array('id' => "quest_{$id}", 'name' => "quest_{$id}", 'type' => 'text'));
                $expout .= html_writer::end_tag('li');
                $expout .= html_writer::end_tag('ul');
                break;
            case 'numerical':
                $expout .= html_writer::start_tag('ul', array('class' => 'numerical'));
                $expout .= html_writer::start_tag('li');
                $expout .= html_writer::label(get_string('answer'), 'quest_'.$id, false, array('class' => 'accesshide'));
                $expout .= html_writer::empty_tag('input', array('id' => "quest_{$id}", 'name' => "quest_{$id}", 'type' => 'text'));
                $expout .= html_writer::end_tag('li');
                $expout .= html_writer::end_tag('ul');
                break;
            case 'match':
                $expout .= html_writer::start_tag('ul', array('class' => 'match'));

// Build answer list.
                $answerlist = array();
                foreach ($question->options->subquestions as $subquestion) {
                    $answerlist[] = $this->repchar( $subquestion->answertext );
                }
                shuffle( $answerlist ); // Random display order.

// Build select options.
                $selectoptions = array();
                foreach ($answerlist as $ans) {
                    $selectoptions[s($ans)] = s($ans);
                }

// Display.
                $option = 0;
                foreach ($question->options->subquestions as $subquestion) {
                    // Build drop down for answers.
                    $questiontext = $this->repchar( $subquestion->questiontext );
                    if ($questiontext != '') {
                        $dropdown = html_writer::label(get_string('answer', 'qtype_match', $option+1), 'quest_'.$id.'_'.$option,
                                false, array('class' => 'accesshide'));
                        $dropdown .= html_writer::select($selectoptions, "quest_{$id}_{$option}", '', false,
                                array('id' => "quest_{$id}_{$option}"));
                        $expout .= html_writer::tag('li', $questiontext);
                        $expout .= $dropdown;
                        $option++;
                    }
                }
                $expout .= html_writer::end_tag('ul');
                break;
            case 'description':
                break;
            case 'multianswer':
            default:
                $expout .= "\n";
        }
        // Close off div.
        $expout .= "</div>\n\n\n";
        return $expout;
    }

protected function presave_process($content) {
        // Override method to allow us to add xhtml headers and footers.

global $CFG;

// Get css bit.
        $csslines = file( "{$CFG->dirroot}/question/format/xhtml/xhtml.css" );
        $css = implode( ' ', $csslines );

$xp =  "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\"\n";
        $xp .= "  \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n";
        $xp .= "<html xmlns=\"http://www.w3.org/1999/xhtml\">\n";
        $xp .= "<head>\n";
        $xp .= "<meta http-equiv=\"content-type\" content=\"text/html; charset=UTF-8\" />\n";
        $xp .= "<title>Moodle Quiz XHTML Export</title>\n";
        $xp .= "<style type=\"text/css\">\n";
        $xp .= $css;
        $xp .= "</style>\n";
        $xp .= "</head>\n";
        $xp .= "<body>\n";
        $xp .= "<form action=\"...REPLACE ME...\" method=\"post\">\n\n";
        $xp .= $content;
        $xp .= "<p class=\"submit\">\n";
        $xp .= "  <input type=\"submit\" />\n";
        $xp .= "</p>\n";
        $xp .= "</form>\n";
        $xp .= "</body>\n";
        $xp .= "</html>\n";

return $xp;
    }

public function export_file_extension() {
        return '.html';
    }
}