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4d18892676
Sadly, this involves a small API change, but I don't believe anyone was using the argument I had to remove (because we were sometimes passing a wrong value, and there is not way to compute the right value at that point in the code.) Also sadly, the code to compute the context we are importing into is now rather spaghetti-like, but it works.
898 lines
30 KiB
PHP
898 lines
30 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Defines the base class for question import and export formats.
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*
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* @package moodlecore
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* @subpackage questionbank
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* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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/**#@+
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* The core question types.
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*
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* These used to be in lib/questionlib.php, but are being deprecated. Copying
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* them here to keep the import/export code working for now (there are 135
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* references to these constants which I don't want to try to fix at the moment.)
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*/
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if (!defined('SHORTANSWER')) {
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define("SHORTANSWER", "shortanswer");
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define("TRUEFALSE", "truefalse");
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define("MULTICHOICE", "multichoice");
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define("RANDOM", "random");
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define("MATCH", "match");
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define("RANDOMSAMATCH", "randomsamatch");
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define("DESCRIPTION", "description");
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define("NUMERICAL", "numerical");
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define("MULTIANSWER", "multianswer");
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define("CALCULATED", "calculated");
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define("ESSAY", "essay");
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}
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/**#@-*/
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/**
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* Base class for question import and export formats.
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*
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* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class qformat_default {
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public $displayerrors = true;
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public $category = null;
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public $questions = array();
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public $course = null;
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public $filename = '';
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public $realfilename = '';
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public $matchgrades = 'error';
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public $catfromfile = 0;
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public $contextfromfile = 0;
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public $cattofile = 0;
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public $contexttofile = 0;
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public $questionids = array();
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public $importerrors = 0;
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public $stoponerror = true;
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public $translator = null;
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public $canaccessbackupdata = true;
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protected $importcontext = null;
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// functions to indicate import/export functionality
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// override to return true if implemented
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/** @return bool whether this plugin provides import functionality. */
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public function provide_import() {
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return false;
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}
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/** @return bool whether this plugin provides export functionality. */
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public function provide_export() {
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return false;
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}
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/** The string mime-type of the files that this plugin reads or writes. */
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public function mime_type() {
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return mimeinfo('type', $this->export_file_extension());
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}
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/**
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* @return string the file extension (including .) that is normally used for
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* files handled by this plugin.
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*/
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public function export_file_extension() {
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return '.txt';
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}
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/**
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* Check if the given file is capable of being imported by this plugin.
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*
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* Note that expensive or detailed integrity checks on the file should
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* not be performed by this method. Simple file type or magic-number tests
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* would be suitable.
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*
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* @param stored_file $file the file to check
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* @return bool whether this plugin can import the file
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*/
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public function can_import_file($file) {
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return ($file->get_mimetype() == $this->mime_type());
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}
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// Accessor methods
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/**
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* set the category
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* @param object category the category object
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*/
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public function setCategory($category) {
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if (count($this->questions)) {
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debugging('You shouldn\'t call setCategory after setQuestions');
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}
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$this->category = $category;
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$this->importcontext = get_context_instance_by_id($this->category->contextid);
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}
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/**
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* Set the specific questions to export. Should not include questions with
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* parents (sub questions of cloze question type).
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* Only used for question export.
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* @param array of question objects
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*/
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public function setQuestions($questions) {
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if ($this->category !== null) {
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debugging('You shouldn\'t call setQuestions after setCategory');
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}
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$this->questions = $questions;
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}
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/**
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* set the course class variable
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* @param course object Moodle course variable
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*/
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public function setCourse($course) {
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$this->course = $course;
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}
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/**
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* set an array of contexts.
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* @param array $contexts Moodle course variable
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*/
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public function setContexts($contexts) {
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$this->contexts = $contexts;
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$this->translator = new context_to_string_translator($this->contexts);
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}
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/**
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* set the filename
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* @param string filename name of file to import/export
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*/
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public function setFilename($filename) {
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$this->filename = $filename;
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}
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/**
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* set the "real" filename
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* (this is what the user typed, regardless of wha happened next)
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* @param string realfilename name of file as typed by user
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*/
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public function setRealfilename($realfilename) {
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$this->realfilename = $realfilename;
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}
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/**
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* set matchgrades
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* @param string matchgrades error or nearest for grades
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*/
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public function setMatchgrades($matchgrades) {
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$this->matchgrades = $matchgrades;
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}
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/**
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* set catfromfile
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* @param bool catfromfile allow categories embedded in import file
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*/
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public function setCatfromfile($catfromfile) {
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$this->catfromfile = $catfromfile;
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}
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/**
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* set contextfromfile
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* @param bool $contextfromfile allow contexts embedded in import file
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*/
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public function setContextfromfile($contextfromfile) {
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$this->contextfromfile = $contextfromfile;
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}
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/**
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* set cattofile
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* @param bool cattofile exports categories within export file
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*/
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public function setCattofile($cattofile) {
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$this->cattofile = $cattofile;
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}
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/**
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* set contexttofile
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* @param bool cattofile exports categories within export file
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*/
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public function setContexttofile($contexttofile) {
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$this->contexttofile = $contexttofile;
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}
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/**
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* set stoponerror
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* @param bool stoponerror stops database write if any errors reported
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*/
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public function setStoponerror($stoponerror) {
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$this->stoponerror = $stoponerror;
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}
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/**
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* @param bool $canaccess Whether the current use can access the backup data folder. Determines
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* where export files are saved.
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*/
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public function set_can_access_backupdata($canaccess) {
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$this->canaccessbackupdata = $canaccess;
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}
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/***********************
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* IMPORTING FUNCTIONS
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***********************/
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/**
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* Handle parsing error
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*/
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protected function error($message, $text='', $questionname='') {
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$importerrorquestion = get_string('importerrorquestion', 'question');
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echo "<div class=\"importerror\">\n";
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echo "<strong>$importerrorquestion $questionname</strong>";
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if (!empty($text)) {
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$text = s($text);
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echo "<blockquote>$text</blockquote>\n";
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}
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echo "<strong>$message</strong>\n";
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echo "</div>";
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$this->importerrors++;
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}
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/**
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* Import for questiontype plugins
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* Do not override.
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* @param data mixed The segment of data containing the question
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* @param question object processed (so far) by standard import code if appropriate
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* @param extra mixed any additional format specific data that may be passed by the format
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* @param qtypehint hint about a question type from format
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* @return object question object suitable for save_options() or false if cannot handle
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*/
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public function try_importing_using_qtypes($data, $question = null, $extra = null,
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$qtypehint = '') {
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// work out what format we are using
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$formatname = substr(get_class($this), strlen('qformat_'));
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$methodname = "import_from_$formatname";
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//first try importing using a hint from format
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if (!empty($qtypehint)) {
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$qtype = question_bank::get_qtype($qtypehint, false);
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if (is_object($qtype) && method_exists($qtype, $methodname)) {
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$question = $qtype->$methodname($data, $question, $this, $extra);
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if ($question) {
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return $question;
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}
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}
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}
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// loop through installed questiontypes checking for
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// function to handle this question
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foreach (question_bank::get_all_qtypes() as $qtype) {
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if (method_exists($qtype, $methodname)) {
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if ($question = $qtype->$methodname($data, $question, $this, $extra)) {
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return $question;
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}
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}
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}
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return false;
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}
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/**
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* Perform any required pre-processing
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* @return bool success
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*/
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public function importpreprocess() {
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return true;
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}
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/**
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* Process the file
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* This method should not normally be overidden
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* @param object $category
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* @return bool success
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*/
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public function importprocess($category) {
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global $USER, $CFG, $DB, $OUTPUT;
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// reset the timer in case file upload was slow
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set_time_limit(0);
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// STAGE 1: Parse the file
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echo $OUTPUT->notification(get_string('parsingquestions', 'question'), 'notifysuccess');
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if (! $lines = $this->readdata($this->filename)) {
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echo $OUTPUT->notification(get_string('cannotread', 'question'));
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return false;
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}
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if (!$questions = $this->readquestions($lines)) { // Extract all the questions
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echo $OUTPUT->notification(get_string('noquestionsinfile', 'question'));
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return false;
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}
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// STAGE 2: Write data to database
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echo $OUTPUT->notification(get_string('importingquestions', 'question',
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$this->count_questions($questions)), 'notifysuccess');
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// check for errors before we continue
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if ($this->stoponerror and ($this->importerrors>0)) {
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echo $OUTPUT->notification(get_string('importparseerror', 'question'));
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return true;
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}
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// get list of valid answer grades
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$gradeoptionsfull = question_bank::fraction_options_full();
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// check answer grades are valid
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// (now need to do this here because of 'stop on error': MDL-10689)
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$gradeerrors = 0;
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$goodquestions = array();
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foreach ($questions as $question) {
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if (!empty($question->fraction) and (is_array($question->fraction))) {
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$fractions = $question->fraction;
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$answersvalid = true; // in case they are!
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foreach ($fractions as $key => $fraction) {
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$newfraction = match_grade_options($gradeoptionsfull, $fraction,
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$this->matchgrades);
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if ($newfraction === false) {
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$answersvalid = false;
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} else {
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$fractions[$key] = $newfraction;
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}
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}
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if (!$answersvalid) {
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echo $OUTPUT->notification(get_string('invalidgrade', 'question'));
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++$gradeerrors;
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continue;
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} else {
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$question->fraction = $fractions;
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}
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}
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$goodquestions[] = $question;
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}
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$questions = $goodquestions;
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// check for errors before we continue
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if ($this->stoponerror && $gradeerrors > 0) {
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return false;
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}
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// count number of questions processed
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$count = 0;
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foreach ($questions as $question) { // Process and store each question
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// reset the php timeout
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set_time_limit(0);
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// check for category modifiers
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if ($question->qtype == 'category') {
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if ($this->catfromfile) {
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// find/create category object
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$catpath = $question->category;
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$newcategory = $this->create_category_path($catpath);
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if (!empty($newcategory)) {
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$this->category = $newcategory;
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}
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}
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continue;
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}
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$question->context = $this->importcontext;
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$count++;
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echo "<hr /><p><b>$count</b>. ".$this->format_question_text($question)."</p>";
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$question->category = $this->category->id;
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$question->stamp = make_unique_id_code(); // Set the unique code (not to be changed)
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$question->createdby = $USER->id;
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$question->timecreated = time();
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$question->modifiedby = $USER->id;
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$question->timemodified = time();
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$question->id = $DB->insert_record('question', $question);
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if (isset($question->questiontextfiles)) {
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foreach ($question->questiontextfiles as $file) {
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question_bank::get_qtype($question->qtype)->import_file(
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$this->importcontext, 'question', 'questiontext', $question->id, $file);
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}
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}
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if (isset($question->generalfeedbackfiles)) {
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foreach ($question->generalfeedbackfiles as $file) {
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question_bank::get_qtype($question->qtype)->import_file(
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$this->importcontext, 'question', 'generalfeedback', $question->id, $file);
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}
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}
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$this->questionids[] = $question->id;
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// Now to save all the answers and type-specific options
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$result = question_bank::get_qtype($question->qtype)->save_question_options($question);
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if (!empty($CFG->usetags) && isset($question->tags)) {
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require_once($CFG->dirroot . '/tag/lib.php');
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tag_set('question', $question->id, $question->tags);
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}
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if (!empty($result->error)) {
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echo $OUTPUT->notification($result->error);
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return false;
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}
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if (!empty($result->notice)) {
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echo $OUTPUT->notification($result->notice);
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return true;
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}
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// Give the question a unique version stamp determined by question_hash()
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$DB->set_field('question', 'version', question_hash($question),
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array('id' => $question->id));
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}
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return true;
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}
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/**
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* Count all non-category questions in the questions array.
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*
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* @param array questions An array of question objects.
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* @return int The count.
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*
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*/
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protected function count_questions($questions) {
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$count = 0;
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if (!is_array($questions)) {
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return $count;
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}
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foreach ($questions as $question) {
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if (!is_object($question) || !isset($question->qtype) ||
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($question->qtype == 'category')) {
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continue;
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}
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$count++;
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}
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return $count;
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}
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/**
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* find and/or create the category described by a delimited list
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* e.g. $course$/tom/dick/harry or tom/dick/harry
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*
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* removes any context string no matter whether $getcontext is set
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* but if $getcontext is set then ignore the context and use selected category context.
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*
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* @param string catpath delimited category path
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* @param int courseid course to search for categories
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* @return mixed category object or null if fails
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*/
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protected function create_category_path($catpath) {
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global $DB;
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$catnames = $this->split_category_path($catpath);
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$parent = 0;
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$category = null;
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// check for context id in path, it might not be there in pre 1.9 exports
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$matchcount = preg_match('/^\$([a-z]+)\$$/', $catnames[0], $matches);
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if ($matchcount == 1) {
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$contextid = $this->translator->string_to_context($matches[1]);
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array_shift($catnames);
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} else {
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$contextid = false;
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}
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if ($this->contextfromfile && $contextid !== false) {
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$context = get_context_instance_by_id($contextid);
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require_capability('moodle/question:add', $context);
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} else {
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$context = get_context_instance_by_id($this->category->contextid);
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}
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$this->importcontext = $context;
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// Now create any categories that need to be created.
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foreach ($catnames as $catname) {
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if ($category = $DB->get_record('question_categories',
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array('name' => $catname, 'contextid' => $context->id, 'parent' => $parent))) {
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$parent = $category->id;
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} else {
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require_capability('moodle/question:managecategory', $context);
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// create the new category
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$category = new stdClass();
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$category->contextid = $context->id;
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$category->name = $catname;
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$category->info = '';
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$category->parent = $parent;
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$category->sortorder = 999;
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$category->stamp = make_unique_id_code();
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$id = $DB->insert_record('question_categories', $category);
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$category->id = $id;
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$parent = $id;
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}
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}
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return $category;
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}
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/**
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* Return complete file within an array, one item per line
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* @param string filename name of file
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* @return mixed contents array or false on failure
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*/
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protected function readdata($filename) {
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if (is_readable($filename)) {
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$filearray = file($filename);
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/// Check for Macintosh OS line returns (ie file on one line), and fix
|
|
if (preg_match("~\r~", $filearray[0]) AND !preg_match("~\n~", $filearray[0])) {
|
|
return explode("\r", $filearray[0]);
|
|
} else {
|
|
return $filearray;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Parses an array of lines into an array of questions,
|
|
* where each item is a question object as defined by
|
|
* readquestion(). Questions are defined as anything
|
|
* between blank lines.
|
|
*
|
|
* NOTE this method used to take $context as a second argument. However, at
|
|
* the point where this method was called, it was impossible to know what
|
|
* context the quetsions were going to be saved into, so the value could be
|
|
* wrong. Also, none of the standard question formats were using this argument,
|
|
* so it was removed. See MDL-32220.
|
|
*
|
|
* If your format does not use blank lines as a delimiter
|
|
* then you will need to override this method. Even then
|
|
* try to use readquestion for each question
|
|
* @param array lines array of lines from readdata
|
|
* @return array array of question objects
|
|
*/
|
|
protected function readquestions($lines) {
|
|
|
|
$questions = array();
|
|
$currentquestion = array();
|
|
|
|
foreach ($lines as $line) {
|
|
$line = trim($line);
|
|
if (empty($line)) {
|
|
if (!empty($currentquestion)) {
|
|
if ($question = $this->readquestion($currentquestion)) {
|
|
$questions[] = $question;
|
|
}
|
|
$currentquestion = array();
|
|
}
|
|
} else {
|
|
$currentquestion[] = $line;
|
|
}
|
|
}
|
|
|
|
if (!empty($currentquestion)) { // There may be a final question
|
|
if ($question = $this->readquestion($currentquestion)) {
|
|
$questions[] = $question;
|
|
}
|
|
}
|
|
|
|
return $questions;
|
|
}
|
|
|
|
/**
|
|
* return an "empty" question
|
|
* Somewhere to specify question parameters that are not handled
|
|
* by import but are required db fields.
|
|
* This should not be overridden.
|
|
* @return object default question
|
|
*/
|
|
protected function defaultquestion() {
|
|
global $CFG;
|
|
static $defaultshuffleanswers = null;
|
|
if (is_null($defaultshuffleanswers)) {
|
|
$defaultshuffleanswers = get_config('quiz', 'shuffleanswers');
|
|
}
|
|
|
|
$question = new stdClass();
|
|
$question->shuffleanswers = $defaultshuffleanswers;
|
|
$question->defaultmark = 1;
|
|
$question->image = "";
|
|
$question->usecase = 0;
|
|
$question->multiplier = array();
|
|
$question->questiontextformat = FORMAT_MOODLE;
|
|
$question->generalfeedback = '';
|
|
$question->generalfeedbackformat = FORMAT_MOODLE;
|
|
$question->correctfeedback = '';
|
|
$question->partiallycorrectfeedback = '';
|
|
$question->incorrectfeedback = '';
|
|
$question->answernumbering = 'abc';
|
|
$question->penalty = 0.3333333;
|
|
$question->length = 1;
|
|
|
|
// this option in case the questiontypes class wants
|
|
// to know where the data came from
|
|
$question->export_process = true;
|
|
$question->import_process = true;
|
|
|
|
return $question;
|
|
}
|
|
|
|
/**
|
|
* Given the data known to define a question in
|
|
* this format, this function converts it into a question
|
|
* object suitable for processing and insertion into Moodle.
|
|
*
|
|
* If your format does not use blank lines to delimit questions
|
|
* (e.g. an XML format) you must override 'readquestions' too
|
|
* @param $lines mixed data that represents question
|
|
* @return object question object
|
|
*/
|
|
protected function readquestion($lines) {
|
|
|
|
$formatnotimplemented = get_string('formatnotimplemented', 'question');
|
|
echo "<p>$formatnotimplemented</p>";
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Override if any post-processing is required
|
|
* @return bool success
|
|
*/
|
|
public function importpostprocess() {
|
|
return true;
|
|
}
|
|
|
|
/*******************
|
|
* EXPORT FUNCTIONS
|
|
*******************/
|
|
|
|
/**
|
|
* Provide export functionality for plugin questiontypes
|
|
* Do not override
|
|
* @param name questiontype name
|
|
* @param question object data to export
|
|
* @param extra mixed any addition format specific data needed
|
|
* @return string the data to append to export or false if error (or unhandled)
|
|
*/
|
|
protected function try_exporting_using_qtypes($name, $question, $extra=null) {
|
|
// work out the name of format in use
|
|
$formatname = substr(get_class($this), strlen('qformat_'));
|
|
$methodname = "export_to_$formatname";
|
|
|
|
$qtype = question_bank::get_qtype($name, false);
|
|
if (method_exists($qtype, $methodname)) {
|
|
return $qtype->$methodname($question, $this, $extra);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Do any pre-processing that may be required
|
|
* @param bool success
|
|
*/
|
|
public function exportpreprocess() {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Enable any processing to be done on the content
|
|
* just prior to the file being saved
|
|
* default is to do nothing
|
|
* @param string output text
|
|
* @param string processed output text
|
|
*/
|
|
protected function presave_process($content) {
|
|
return $content;
|
|
}
|
|
|
|
/**
|
|
* Do the export
|
|
* For most types this should not need to be overrided
|
|
* @return stored_file
|
|
*/
|
|
public function exportprocess() {
|
|
global $CFG, $OUTPUT, $DB, $USER;
|
|
|
|
// get the questions (from database) in this category
|
|
// only get q's with no parents (no cloze subquestions specifically)
|
|
if ($this->category) {
|
|
$questions = get_questions_category($this->category, true);
|
|
} else {
|
|
$questions = $this->questions;
|
|
}
|
|
|
|
$count = 0;
|
|
|
|
// results are first written into string (and then to a file)
|
|
// so create/initialize the string here
|
|
$expout = "";
|
|
|
|
// track which category questions are in
|
|
// if it changes we will record the category change in the output
|
|
// file if selected. 0 means that it will get printed before the 1st question
|
|
$trackcategory = 0;
|
|
|
|
// iterate through questions
|
|
foreach ($questions as $question) {
|
|
// used by file api
|
|
$contextid = $DB->get_field('question_categories', 'contextid',
|
|
array('id' => $question->category));
|
|
$question->contextid = $contextid;
|
|
|
|
// do not export hidden questions
|
|
if (!empty($question->hidden)) {
|
|
continue;
|
|
}
|
|
|
|
// do not export random questions
|
|
if ($question->qtype == 'random') {
|
|
continue;
|
|
}
|
|
|
|
// check if we need to record category change
|
|
if ($this->cattofile) {
|
|
if ($question->category != $trackcategory) {
|
|
$trackcategory = $question->category;
|
|
$categoryname = $this->get_category_path($trackcategory, $this->contexttofile);
|
|
|
|
// create 'dummy' question for category export
|
|
$dummyquestion = new stdClass();
|
|
$dummyquestion->qtype = 'category';
|
|
$dummyquestion->category = $categoryname;
|
|
$dummyquestion->name = 'Switch category to ' . $categoryname;
|
|
$dummyquestion->id = 0;
|
|
$dummyquestion->questiontextformat = '';
|
|
$dummyquestion->contextid = 0;
|
|
$expout .= $this->writequestion($dummyquestion) . "\n";
|
|
}
|
|
}
|
|
|
|
// export the question displaying message
|
|
$count++;
|
|
|
|
if (question_has_capability_on($question, 'view', $question->category)) {
|
|
$expout .= $this->writequestion($question, $contextid) . "\n";
|
|
}
|
|
}
|
|
|
|
// continue path for following error checks
|
|
$course = $this->course;
|
|
$continuepath = "$CFG->wwwroot/question/export.php?courseid=$course->id";
|
|
|
|
// did we actually process anything
|
|
if ($count==0) {
|
|
print_error('noquestions', 'question', $continuepath);
|
|
}
|
|
|
|
// final pre-process on exported data
|
|
$expout = $this->presave_process($expout);
|
|
return $expout;
|
|
}
|
|
|
|
/**
|
|
* get the category as a path (e.g., tom/dick/harry)
|
|
* @param int id the id of the most nested catgory
|
|
* @return string the path
|
|
*/
|
|
protected function get_category_path($id, $includecontext = true) {
|
|
global $DB;
|
|
|
|
if (!$category = $DB->get_record('question_categories', array('id' => $id))) {
|
|
print_error('cannotfindcategory', 'error', '', $id);
|
|
}
|
|
$contextstring = $this->translator->context_to_string($category->contextid);
|
|
|
|
$pathsections = array();
|
|
do {
|
|
$pathsections[] = $category->name;
|
|
$id = $category->parent;
|
|
} while ($category = $DB->get_record('question_categories', array('id' => $id)));
|
|
|
|
if ($includecontext) {
|
|
$pathsections[] = '$' . $contextstring . '$';
|
|
}
|
|
|
|
$path = $this->assemble_category_path(array_reverse($pathsections));
|
|
|
|
return $path;
|
|
}
|
|
|
|
/**
|
|
* Convert a list of category names, possibly preceeded by one of the
|
|
* context tokens like $course$, into a string representation of the
|
|
* category path.
|
|
*
|
|
* Names are separated by / delimiters. And /s in the name are replaced by //.
|
|
*
|
|
* To reverse the process and split the paths into names, use
|
|
* {@link split_category_path()}.
|
|
*
|
|
* @param array $names
|
|
* @return string
|
|
*/
|
|
protected function assemble_category_path($names) {
|
|
$escapednames = array();
|
|
foreach ($names as $name) {
|
|
$escapedname = str_replace('/', '//', $name);
|
|
if (substr($escapedname, 0, 1) == '/') {
|
|
$escapedname = ' ' . $escapedname;
|
|
}
|
|
if (substr($escapedname, -1) == '/') {
|
|
$escapedname = $escapedname . ' ';
|
|
}
|
|
$escapednames[] = $escapedname;
|
|
}
|
|
return implode('/', $escapednames);
|
|
}
|
|
|
|
/**
|
|
* Convert a string, as returned by {@link assemble_category_path()},
|
|
* back into an array of category names.
|
|
*
|
|
* Each category name is cleaned by a call to clean_param(, PARAM_MULTILANG),
|
|
* which matches the cleaning in question/category_form.php.
|
|
*
|
|
* @param string $path
|
|
* @return array of category names.
|
|
*/
|
|
protected function split_category_path($path) {
|
|
$rawnames = preg_split('~(?<!/)/(?!/)~', $path);
|
|
$names = array();
|
|
foreach ($rawnames as $rawname) {
|
|
$names[] = clean_param(trim(str_replace('//', '/', $rawname)), PARAM_MULTILANG);
|
|
}
|
|
return $names;
|
|
}
|
|
|
|
/**
|
|
* Do an post-processing that may be required
|
|
* @return bool success
|
|
*/
|
|
protected function exportpostprocess() {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* convert a single question object into text output in the given
|
|
* format.
|
|
* This must be overriden
|
|
* @param object question question object
|
|
* @return mixed question export text or null if not implemented
|
|
*/
|
|
protected function writequestion($question) {
|
|
// if not overidden, then this is an error.
|
|
$formatnotimplemented = get_string('formatnotimplemented', 'question');
|
|
echo "<p>$formatnotimplemented</p>";
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Convert the question text to plain text, so it can safely be displayed
|
|
* during import to let the user see roughly what is going on.
|
|
*/
|
|
protected function format_question_text($question) {
|
|
global $DB;
|
|
$formatoptions = new stdClass();
|
|
$formatoptions->noclean = true;
|
|
return html_to_text(format_text($question->questiontext,
|
|
$question->questiontextformat, $formatoptions), 0, false);
|
|
}
|
|
}
|