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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/>.
/**
* format.php - Default format class for file imports/exports. Doesn't do
* everything on it's own -- it needs to be extended.
*
* Included by import.ph
*
* @package mod_lesson
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
**/
defined('MOODLE_INTERNAL') || die();
/**
* Import files embedded into answer or response
*
* @param string $field nfield name (answer or response)
* @param array $data imported data
* @param object $answer answer object
* @param int $contextid
**/
function lesson_import_question_files($field, $data, $answer, $contextid) {
global $DB;
if (!isset($data['itemid'])) {
return;
}
$text = file_save_draft_area_files($data['itemid'],
$contextid, 'mod_lesson', 'page_' . $field . 's', $answer->id,
array('subdirs' => false, 'maxfiles' => -1, 'maxbytes' => 0),
$answer->$field);
$DB->set_field("lesson_answers", $field, $text, array("id" => $answer->id));
}
/**
* Given some question info and some data about the the answers
* this function parses, organises and saves the question
*
* This is only used when IMPORTING questions and is only called
* from format.php
* Lifted from mod/quiz/lib.php -
* 1. all reference to oldanswers removed
* 2. all reference to quiz_multichoice table removed
* 3. In shortanswer questions usecase is store in the qoption field
* 4. In numeric questions store the range as two answers
* 5. truefalse options are ignored
* 6. For multichoice questions with more than one answer the qoption field is true
*
* @param object $question Contains question data like question, type and answers.
* @param object $lesson
* @param int $contextid
* @return object Returns $result->error or $result->notice.
**/
function lesson_save_question_options($question, $lesson, $contextid) {
global $DB;
// These lines are required to ensure that all page types have
// been loaded for the following switch
if (!($lesson instanceof lesson)) {
$lesson = new lesson($lesson);
}
$manager = lesson_page_type_manager::get($lesson);
$timenow = time();
$result = new stdClass();
// Default answer to avoid code duplication.
$defaultanswer = new stdClass();
$defaultanswer->lessonid = $question->lessonid;
$defaultanswer->pageid = $question->id;
$defaultanswer->timecreated = $timenow;
$defaultanswer->answerformat = FORMAT_HTML;
$defaultanswer->jumpto = LESSON_THISPAGE;
$defaultanswer->grade = 0;
$defaultanswer->score = 0;
switch ($question->qtype) {
case LESSON_PAGE_SHORTANSWER:
$answers = array();
$maxfraction = -1;
// Insert all the new answers
foreach ($question->answer as $key => $dataanswer) {
if ($dataanswer != "") {
$answer = clone($defaultanswer);
if ($question->fraction[$key] >=0.5) {
$answer->jumpto = LESSON_NEXTPAGE;
$answer->score = 1;
}
$answer->grade = round($question->fraction[$key] * 100);
$answer->answer = $dataanswer;
$answer->response = $question->feedback[$key]['text'];
$answer->responseformat = $question->feedback[$key]['format'];
$answer->id = $DB->insert_record("lesson_answers", $answer);
lesson_import_question_files('response', $question->feedback[$key], $answer, $contextid);
$answers[] = $answer->id;
if ($question->fraction[$key] > $maxfraction) {
$maxfraction = $question->fraction[$key];
}
}
}
/// Perform sanity checks on fractional grades
if ($maxfraction != 1) {
$maxfraction = $maxfraction * 100;
$result->notice = get_string("fractionsnomax", "lesson", $maxfraction);
return $result;
}
break;
case LESSON_PAGE_NUMERICAL: // Note similarities to shortanswer.
$answers = array();
$maxfraction = -1;
// for each answer store the pair of min and max values even if they are the same
foreach ($question->answer as $key => $dataanswer) {
if ($dataanswer != "") {
$answer = clone($defaultanswer);
if ($question->fraction[$key] >= 0.5) {
$answer->jumpto = LESSON_NEXTPAGE;
$answer->score = 1;
}
$answer->grade = round($question->fraction[$key] * 100);
$min = $question->answer[$key] - $question->tolerance[$key];
$max = $question->answer[$key] + $question->tolerance[$key];
$answer->answer = $min.":".$max;
$answer->response = $question->feedback[$key]['text'];
$answer->responseformat = $question->feedback[$key]['format'];
$answer->id = $DB->insert_record("lesson_answers", $answer);
lesson_import_question_files('response', $question->feedback[$key], $answer, $contextid);
$answers[] = $answer->id;
if ($question->fraction[$key] > $maxfraction) {
$maxfraction = $question->fraction[$key];
}
}
}
/// Perform sanity checks on fractional grades
if ($maxfraction != 1) {
$maxfraction = $maxfraction * 100;
$result->notice = get_string("fractionsnomax", "lesson", $maxfraction);
return $result;
}
break;
case LESSON_PAGE_TRUEFALSE:
// In lesson the correct answer always come first, as it was the case
// in question bank exports years ago.
$answer = clone($defaultanswer);
$answer->grade = 100;
$answer->jumpto = LESSON_NEXTPAGE;
$answer->score = 1;
if ($question->correctanswer) {
$answer->answer = get_string("true", "lesson");
if (isset($question->feedbacktrue)) {
$answer->response = $question->feedbacktrue['text'];
$answer->responseformat = $question->feedbacktrue['format'];
$answer->id = $DB->insert_record("lesson_answers", $answer);
lesson_import_question_files('response', $question->feedbacktrue, $answer, $contextid);
}
} else {
$answer->answer = get_string("false", "lesson");
if (isset($question->feedbackfalse)) {
$answer->response = $question->feedbackfalse['text'];
$answer->responseformat = $question->feedbackfalse['format'];
$answer->id = $DB->insert_record("lesson_answers", $answer);
lesson_import_question_files('response', $question->feedbackfalse, $answer, $contextid);
}
}
// Now the wrong answer.
$answer = clone($defaultanswer);
if ($question->correctanswer) {
$answer->answer = get_string("false", "lesson");
if (isset($question->feedbackfalse)) {
$answer->response = $question->feedbackfalse['text'];
$answer->responseformat = $question->feedbackfalse['format'];
$answer->id = $DB->insert_record("lesson_answers", $answer);
lesson_import_question_files('response', $question->feedbackfalse, $answer, $contextid);
}
} else {
$answer->answer = get_string("true", "lesson");
if (isset($question->feedbacktrue)) {
$answer->response = $question->feedbacktrue['text'];
$answer->responseformat = $question->feedbacktrue['format'];
$answer->id = $DB->insert_record("lesson_answers", $answer);
lesson_import_question_files('response', $question->feedbacktrue, $answer, $contextid);
}
}
break;
case LESSON_PAGE_MULTICHOICE:
$totalfraction = 0;
$maxfraction = -1;
$answers = array();
// Insert all the new answers
foreach ($question->answer as $key => $dataanswer) {
if ($dataanswer != "") {
$answer = clone($defaultanswer);
$answer->grade = round($question->fraction[$key] * 100);
if ($question->single) {
if ($answer->grade > 50) {
$answer->jumpto = LESSON_NEXTPAGE;
$answer->score = 1;
}
} else {
// If multi answer allowed, any answer with fraction > 0 is considered correct.
if ($question->fraction[$key] > 0) {
$answer->jumpto = LESSON_NEXTPAGE;
$answer->score = 1;
}
}
$answer->answer = $dataanswer['text'];
$answer->answerformat = $dataanswer['format'];
$answer->response = $question->feedback[$key]['text'];
$answer->responseformat = $question->feedback[$key]['format'];
$answer->id = $DB->insert_record("lesson_answers", $answer);
lesson_import_question_files('answer', $dataanswer, $answer, $contextid);
lesson_import_question_files('response', $question->feedback[$key], $answer, $contextid);
// for Sanity checks
if ($question->fraction[$key] > 0) {
$totalfraction += $question->fraction[$key];
}
if ($question->fraction[$key] > $maxfraction) {
$maxfraction = $question->fraction[$key];
}
}
}
/// Perform sanity checks on fractional grades
if ($question->single) {
if ($maxfraction != 1) {
$maxfraction = $maxfraction * 100;
$result->notice = get_string("fractionsnomax", "lesson", $maxfraction);
return $result;
}
} else {
$totalfraction = round($totalfraction,2);
if ($totalfraction != 1) {
$totalfraction = $totalfraction * 100;
$result->notice = get_string("fractionsaddwrong", "lesson", $totalfraction);
return $result;
}
}
break;
case LESSON_PAGE_MATCHING:
$subquestions = array();
// The first answer should always be the correct answer
$correctanswer = clone($defaultanswer);
$correctanswer->answer = get_string('thatsthecorrectanswer', 'lesson');
$correctanswer->jumpto = LESSON_NEXTPAGE;
$correctanswer->score = 1;
$DB->insert_record("lesson_answers", $correctanswer);
// The second answer should always be the wrong answer
$wronganswer = clone($defaultanswer);
$wronganswer->answer = get_string('thatsthewronganswer', 'lesson');
$DB->insert_record("lesson_answers", $wronganswer);
$i = 0;
// Insert all the new question+answer pairs
foreach ($question->subquestions as $key => $questiontext) {
$answertext = $question->subanswers[$key];
if (!empty($questiontext) and !empty($answertext)) {
$answer = clone($defaultanswer);
$answer->answer = $questiontext['text'];
$answer->answerformat = $questiontext['format'];
$answer->response = $answertext;
if ($i == 0) {
// first answer contains the correct answer jump
$answer->jumpto = LESSON_NEXTPAGE;
}
$answer->id = $DB->insert_record("lesson_answers", $answer);
lesson_import_question_files('answer', $questiontext, $answer, $contextid);
$subquestions[] = $answer->id;
$i++;
}
}
if (count($subquestions) < 3) {
$result->notice = get_string("notenoughsubquestions", "lesson");
return $result;
}
break;
case LESSON_PAGE_ESSAY:
$answer = new stdClass();
$answer->lessonid = $question->lessonid;
$answer->pageid = $question->id;
$answer->timecreated = $timenow;
$answer->answer = null;
$answer->answerformat = FORMAT_MOODLE;
$answer->grade = 0;
$answer->score = 1;
$answer->jumpto = LESSON_NEXTPAGE;
$answer->response = null;
$answer->responseformat = FORMAT_MOODLE;
$answer->id = $DB->insert_record("lesson_answers", $answer);
break;
default:
$result->error = "Unsupported question type ($question->qtype)!";
return $result;
}
return true;
}
class qformat_default {
var $displayerrors = true;
var $category = null;
var $questionids = array();
protected $importcontext = null;
var $qtypeconvert = array('numerical' => LESSON_PAGE_NUMERICAL,
'multichoice' => LESSON_PAGE_MULTICHOICE,
'truefalse' => LESSON_PAGE_TRUEFALSE,
'shortanswer' => LESSON_PAGE_SHORTANSWER,
'match' => LESSON_PAGE_MATCHING,
'essay' => LESSON_PAGE_ESSAY
);
// Importing functions
function provide_import() {
return false;
}
function set_importcontext($context) {
$this->importcontext = $context;
}
/**
* Handle parsing error
*
* @param string $message information about error
* @param string $text imported text that triggered the error
* @param string $questionname imported question name
*/
protected function error($message, $text='', $questionname='') {
$importerrorquestion = get_string('importerrorquestion', 'question');
echo "<div class=\"importerror\">\n";
echo "<strong>$importerrorquestion $questionname</strong>";
if (!empty($text)) {
$text = s($text);
echo "<blockquote>$text</blockquote>\n";
}
echo "<strong>$message</strong>\n";
echo "</div>";
}
/**
* Import for questiontype plugins
* @param mixed $data The segment of data containing the question
* @param object $question processed (so far) by standard import code if appropriate
* @param object $extra mixed any additional format specific data that may be passed by the format
* @param string $qtypehint hint about a question type from format
* @return object question object suitable for save_options() or false if cannot handle
*/
public function try_importing_using_qtypes($data, $question = null, $extra = null,
$qtypehint = '') {
return false;
}
function importpreprocess() {
// Does any pre-processing that may be desired
return true;
}
function importprocess($filename, $lesson, $pageid) {
global $DB, $OUTPUT;
/// Processes a given file. There's probably little need to change this
$timenow = time();
if (! $lines = $this->readdata($filename)) {
echo $OUTPUT->notification("File could not be read, or was empty");
return false;
}
if (! $questions = $this->readquestions($lines)) { // Extract all the questions
echo $OUTPUT->notification("There are no questions in this file!");
return false;
}
//Avoid category as question type
echo $OUTPUT->notification(get_string('importcount', 'lesson',
$this->count_questions($questions)), 'notifysuccess');
$count = 0;
$addquestionontop = false;
if ($pageid == 0) {
$addquestionontop = true;
$updatelessonpage = $DB->get_record('lesson_pages', array('lessonid' => $lesson->id, 'prevpageid' => 0));
} else {
$updatelessonpage = $DB->get_record('lesson_pages', array('lessonid' => $lesson->id, 'id' => $pageid));
}
$unsupportedquestions = 0;
foreach ($questions as $question) { // Process and store each question
switch ($question->qtype) {
//TODO: Bad way to bypass category in data... Quickfix for MDL-27964
case 'category':
break;
// the good ones
case 'shortanswer' :
case 'numerical' :
case 'truefalse' :
case 'multichoice' :
case 'match' :
case 'essay' :
$count++;
//Show nice formated question in one line.
echo "<hr><p><b>$count</b>. ".$this->format_question_text($question)."</p>";
$newpage = new stdClass;
$newpage->lessonid = $lesson->id;
$newpage->qtype = $this->qtypeconvert[$question->qtype];
switch ($question->qtype) {
case 'shortanswer' :
if (isset($question->usecase)) {
$newpage->qoption = $question->usecase;
}
break;
case 'multichoice' :
if (isset($question->single)) {
$newpage->qoption = !$question->single;
}
break;
}
$newpage->timecreated = $timenow;
if ($question->name != $question->questiontext) {
$newpage->title = $question->name;
} else {
$newpage->title = "Page $count";
}
$newpage->contents = $question->questiontext;
$newpage->contentsformat = isset($question->questionformat) ? $question->questionformat : FORMAT_HTML;
// set up page links
if ($pageid) {
// the new page follows on from this page
if (!$page = $DB->get_record("lesson_pages", array("id" => $pageid))) {
print_error('invalidpageid', 'lesson');
}
$newpage->prevpageid = $pageid;
$newpage->nextpageid = $page->nextpageid;
// insert the page and reset $pageid
$newpageid = $DB->insert_record("lesson_pages", $newpage);
// update the linked list
$DB->set_field("lesson_pages", "nextpageid", $newpageid, array("id" => $pageid));
} else {
// new page is the first page
// get the existing (first) page (if any)
$params = array ("lessonid" => $lesson->id, "prevpageid" => 0);
if (!$page = $DB->get_record_select("lesson_pages", "lessonid = :lessonid AND prevpageid = :prevpageid", $params)) {
// there are no existing pages
$newpage->prevpageid = 0; // this is a first page
$newpage->nextpageid = 0; // this is the only page
$newpageid = $DB->insert_record("lesson_pages", $newpage);
} else {
// there are existing pages put this at the start
$newpage->prevpageid = 0; // this is a first page
$newpage->nextpageid = $page->id;
$newpageid = $DB->insert_record("lesson_pages", $newpage);
// update the linked list
$DB->set_field("lesson_pages", "prevpageid", $newpageid, array("id" => $page->id));
}
}
// reset $pageid and put the page ID in $question, used in save_question_option()
$pageid = $newpageid;
$question->id = $newpageid;
$this->questionids[] = $question->id;
// Import images in question text.
if (isset($question->questiontextitemid)) {
$questiontext = file_save_draft_area_files($question->questiontextitemid,
$this->importcontext->id, 'mod_lesson', 'page_contents', $newpageid,
null , $question->questiontext);
// Update content with recoded urls.
$DB->set_field("lesson_pages", "contents", $questiontext, array("id" => $newpageid));
}
// Now to save all the answers and type-specific options
$question->lessonid = $lesson->id; // needed for foreign key
$question->qtype = $this->qtypeconvert[$question->qtype];
$result = lesson_save_question_options($question, $lesson, $this->importcontext->id);
if (!empty($result->error)) {
echo $OUTPUT->notification($result->error);
return false;
}
if (!empty($result->notice)) {
echo $OUTPUT->notification($result->notice);
return true;
}
break;
// the Bad ones
default :
$unsupportedquestions++;
break;
}
}
// Update the prev links if there were existing pages.
if (!empty($updatelessonpage)) {
if ($addquestionontop) {
$DB->set_field("lesson_pages", "prevpageid", $pageid, array("id" => $updatelessonpage->id));
} else {
$DB->set_field("lesson_pages", "prevpageid", $pageid, array("id" => $updatelessonpage->nextpageid));
}
}
if ($unsupportedquestions) {
echo $OUTPUT->notification(get_string('unknownqtypesnotimported', 'lesson', $unsupportedquestions));
}
return true;
}
/**
* Count all non-category questions in the questions array.
*
* @param array questions An array of question objects.
* @return int The count.
*
*/
protected function count_questions($questions) {
$count = 0;
if (!is_array($questions)) {
return $count;
}
foreach ($questions as $question) {
if (!is_object($question) || !isset($question->qtype) ||
($question->qtype == 'category')) {
continue;
}
$count++;
}
return $count;
}
function readdata($filename) {
/// Returns complete file with an array, one item per line
if (is_readable($filename)) {
$filearray = file($filename);
/// 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 $filearray;
}
}
return false;
}
protected function readquestions($lines) {
/// 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.
$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 $questions;
}
protected function readquestion($lines) {
/// Given an array of lines known to define a question in
/// this format, this function converts it into a question
/// object suitable for processing and insertion into Moodle.
// We should never get there unless the qformat plugin is broken.
throw new coding_exception('Question format plugin is missing important code: readquestion.');
return null;
}
/**
* Construct a reasonable default question name, based on the start of the question text.
* @param string $questiontext the question text.
* @param string $default default question name to use if the constructed one comes out blank.
* @return string a reasonable question name.
*/
public function create_default_question_name($questiontext, $default) {
$name = $this->clean_question_name(shorten_text($questiontext, 80));
if ($name) {
return $name;
} else {
return $default;
}
}
/**
* Ensure that a question name does not contain anything nasty, and will fit in the DB field.
* @param string $name the raw question name.
* @return string a safe question name.
*/
public function clean_question_name($name) {
$name = clean_param($name, PARAM_TEXT); // Matches what the question editing form does.
$name = trim($name);
$trimlength = 251;
while (core_text::strlen($name) > 255 && $trimlength > 0) {
$name = shorten_text($name, $trimlength);
$trimlength -= 10;
}
return $name;
}
/**
* 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;
$question->qoption = 0;
$question->layout = 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 $question;
}
function importpostprocess() {
/// Does any post-processing that may be desired
/// Argument is a simple array of question ids that
/// have just been added.
return true;
}
/**
* Convert the question text to plain text, so it can safely be displayed
* during import to let the user see roughly what is going on.
*/
protected function format_question_text($question) {
$formatoptions = new stdClass();
$formatoptions->noclean = true;
// The html_to_text call strips out all URLs, but format_text complains
// if it finds @@PLUGINFILE@@ tokens. So, we need to replace
// @@PLUGINFILE@@ with a real URL, but it doesn't matter what.
// We use http://example.com/.
$text = str_replace('@@PLUGINFILE@@/', 'http://example.com/', $question->questiontext);
return s(html_to_text(format_text($text,
$question->questiontextformat, $formatoptions), 0, false));
}
/**
* Since the lesson module tries to re-use the question bank import classes in
* a crazy way, this is necessary to stop things breaking.
*/
protected function add_blank_combined_feedback($question) {
return $question;
}
}
/**
* Since the lesson module tries to re-use the question bank import classes in
* a crazy way, this is necessary to stop things breaking. This should be exactly
* the same as the class defined in question/format.php.
*/
class qformat_based_on_xml extends qformat_default {
/**
* A lot of imported files contain unwanted entities.
* This method tries to clean up all known problems.
* @param string str string to correct
* @return string the corrected string
*/
public function cleaninput($str) {
$html_code_list = array(
"'" => "'",
"’" => "'",
"“" => "\"",
"”" => "\"",
"–" => "-",
"—" => "-",
);
$str = strtr($str, $html_code_list);
// Use core_text entities_to_utf8 function to convert only numerical entities.
$str = core_text::entities_to_utf8($str, false);
return $str;
}
/**
* Return the array moodle is expecting
* for an HTML text. No processing is done on $text.
* qformat classes that want to process $text
* for instance to import external images files
* and recode urls in $text must overwrite this method.
* @param array $text some HTML text string
* @return array with keys text, format and files.
*/
public function text_field($text) {
return array(
'text' => trim($text),
'format' => FORMAT_HTML,
'files' => array(),
);
}
/**
* Return the value of a node, given a path to the node
* if it doesn't exist return the default value.
* @param array xml data to read
* @param array path path to node expressed as array
* @param mixed default
* @param bool istext process as text
* @param string error if set value must exist, return false and issue message if not
* @return mixed value
*/
public function getpath($xml, $path, $default, $istext=false, $error='') {
foreach ($path as $index) {
if (!isset($xml[$index])) {
if (!empty($error)) {
$this->error($error);
return false;
} else {
return $default;
}
}
$xml = $xml[$index];
}
if ($istext) {
if (!is_string($xml)) {
$this->error(get_string('invalidxml', 'qformat_xml'));
}
$xml = trim($xml);
}
return $xml;
}
}