2 // This file is part of Moodle - http://moodle.org/
4 // Moodle is free software: you can redistribute it and/or modify
5 // it under the terms of the GNU General Public License as published by
6 // the Free Software Foundation, either version 3 of the License, or
7 // (at your option) any later version.
9 // Moodle is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
14 // You should have received a copy of the GNU General Public License
15 // along with Moodle. If not, see <http://www.gnu.org/licenses/>.
18 * Defines the base class for question import and export formats.
21 * @subpackage questionbank
22 * @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
23 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
27 defined('MOODLE_INTERNAL') ||
die();
31 * Base class for question import and export formats.
33 * @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
34 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
36 class qformat_default
{
38 public $displayerrors = true;
39 public $category = null;
40 public $questions = array();
41 public $course = null;
42 public $filename = '';
43 public $realfilename = '';
44 public $matchgrades = 'error';
45 public $catfromfile = 0;
46 public $contextfromfile = 0;
47 public $cattofile = 0;
48 public $contexttofile = 0;
49 public $questionids = array();
50 public $importerrors = 0;
51 public $stoponerror = true;
52 public $translator = null;
53 public $canaccessbackupdata = true;
54 protected $importcontext = null;
55 /** @var bool $displayprogress Whether to display progress. */
56 public $displayprogress = true;
58 // functions to indicate import/export functionality
59 // override to return true if implemented
61 /** @return bool whether this plugin provides import functionality. */
62 public function provide_import() {
66 /** @return bool whether this plugin provides export functionality. */
67 public function provide_export() {
71 /** The string mime-type of the files that this plugin reads or writes. */
72 public function mime_type() {
73 return mimeinfo('type', $this->export_file_extension());
77 * @return string the file extension (including .) that is normally used for
78 * files handled by this plugin.
80 public function export_file_extension() {
85 * Check if the given file is capable of being imported by this plugin.
87 * Note that expensive or detailed integrity checks on the file should
88 * not be performed by this method. Simple file type or magic-number tests
91 * @param stored_file $file the file to check
92 * @return bool whether this plugin can import the file
94 public function can_import_file($file) {
95 return ($file->get_mimetype() == $this->mime_type());
99 * Validate the given file.
101 * For more expensive or detailed integrity checks.
103 * @param stored_file $file the file to check
104 * @return string the error message that occurred while validating the given file
106 public function validate_file(stored_file
$file): string {
111 * Check if the given file has the required utf8 encoding.
113 * @param stored_file $file the file to check
114 * @return string the error message if the file encoding is not UTF-8
116 protected function validate_is_utf8_file(stored_file
$file): string {
117 if (!mb_check_encoding($file->get_content(), "UTF-8")) {
118 return get_string('importwrongfileencoding', 'question', $this->get_name());
124 * Return the localized pluginname string for the question format.
126 * @return string the pluginname string for the question format
128 protected function get_name(): string {
129 return get_string('pluginname', get_class($this));
136 * @param object category the category object
138 public function setCategory($category) {
139 if (count($this->questions
)) {
140 debugging('You shouldn\'t call setCategory after setQuestions');
142 $this->category
= $category;
143 $this->importcontext
= context
::instance_by_id($this->category
->contextid
);
147 * Set the specific questions to export. Should not include questions with
148 * parents (sub questions of cloze question type).
149 * Only used for question export.
150 * @param array of question objects
152 public function setQuestions($questions) {
153 if ($this->category
!== null) {
154 debugging('You shouldn\'t call setQuestions after setCategory');
156 $this->questions
= $questions;
160 * set the course class variable
161 * @param course object Moodle course variable
163 public function setCourse($course) {
164 $this->course
= $course;
168 * set an array of contexts.
169 * @param array $contexts Moodle course variable
171 public function setContexts($contexts) {
172 $this->contexts
= $contexts;
173 $this->translator
= new core_question\local\bank\
context_to_string_translator($this->contexts
);
178 * @param string filename name of file to import/export
180 public function setFilename($filename) {
181 $this->filename
= $filename;
185 * set the "real" filename
186 * (this is what the user typed, regardless of wha happened next)
187 * @param string realfilename name of file as typed by user
189 public function setRealfilename($realfilename) {
190 $this->realfilename
= $realfilename;
195 * @param string matchgrades error or nearest for grades
197 public function setMatchgrades($matchgrades) {
198 $this->matchgrades
= $matchgrades;
203 * @param bool catfromfile allow categories embedded in import file
205 public function setCatfromfile($catfromfile) {
206 $this->catfromfile
= $catfromfile;
210 * set contextfromfile
211 * @param bool $contextfromfile allow contexts embedded in import file
213 public function setContextfromfile($contextfromfile) {
214 $this->contextfromfile
= $contextfromfile;
219 * @param bool cattofile exports categories within export file
221 public function setCattofile($cattofile) {
222 $this->cattofile
= $cattofile;
227 * @param bool cattofile exports categories within export file
229 public function setContexttofile($contexttofile) {
230 $this->contexttofile
= $contexttofile;
235 * @param bool stoponerror stops database write if any errors reported
237 public function setStoponerror($stoponerror) {
238 $this->stoponerror
= $stoponerror;
242 * @param bool $canaccess Whether the current use can access the backup data folder. Determines
243 * where export files are saved.
245 public function set_can_access_backupdata($canaccess) {
246 $this->canaccessbackupdata
= $canaccess;
250 * Change whether to display progress messages.
251 * There is normally no need to use this function as the
252 * default for $displayprogress is true.
253 * Set to false for unit tests.
254 * @param bool $displayprogress
256 public function set_display_progress($displayprogress) {
257 $this->displayprogress
= $displayprogress;
260 /***********************
261 * IMPORTING FUNCTIONS
262 ***********************/
265 * Handle parsing error
267 protected function error($message, $text='', $questionname='') {
268 $importerrorquestion = get_string('importerrorquestion', 'question');
270 echo "<div class=\"importerror\">\n";
271 echo "<strong>{$importerrorquestion} {$questionname}</strong>";
274 echo "<blockquote>{$text}</blockquote>\n";
276 echo "<strong>{$message}</strong>\n";
279 $this->importerrors++
;
283 * Import for questiontype plugins
285 * @param data mixed The segment of data containing the question
286 * @param question object processed (so far) by standard import code if appropriate
287 * @param extra mixed any additional format specific data that may be passed by the format
288 * @param qtypehint hint about a question type from format
289 * @return object question object suitable for save_options() or false if cannot handle
291 public function try_importing_using_qtypes($data, $question = null, $extra = null,
294 // work out what format we are using
295 $formatname = substr(get_class($this), strlen('qformat_'));
296 $methodname = "import_from_{$formatname}";
298 //first try importing using a hint from format
299 if (!empty($qtypehint)) {
300 $qtype = question_bank
::get_qtype($qtypehint, false);
301 if (is_object($qtype) && method_exists($qtype, $methodname)) {
302 $question = $qtype->$methodname($data, $question, $this, $extra);
309 // loop through installed questiontypes checking for
310 // function to handle this question
311 foreach (question_bank
::get_all_qtypes() as $qtype) {
312 if (method_exists($qtype, $methodname)) {
313 if ($question = $qtype->$methodname($data, $question, $this, $extra)) {
322 * Perform any required pre-processing
323 * @return bool success
325 public function importpreprocess() {
331 * This method should not normally be overidden
332 * @return bool success
334 public function importprocess() {
335 global $USER, $DB, $OUTPUT;
337 // Raise time and memory, as importing can be quite intensive.
338 core_php_time_limit
::raise();
339 raise_memory_limit(MEMORY_EXTRA
);
341 // STAGE 1: Parse the file
342 if ($this->displayprogress
) {
343 echo $OUTPUT->notification(get_string('parsingquestions', 'question'), 'notifysuccess');
346 if (! $lines = $this->readdata($this->filename
)) {
347 echo $OUTPUT->notification(get_string('cannotread', 'question'));
351 if (!$questions = $this->readquestions($lines)) { // Extract all the questions
352 echo $OUTPUT->notification(get_string('noquestionsinfile', 'question'));
356 // STAGE 2: Write data to database
357 if ($this->displayprogress
) {
358 echo $OUTPUT->notification(get_string('importingquestions', 'question',
359 $this->count_questions($questions)), 'notifysuccess');
362 // check for errors before we continue
363 if ($this->stoponerror
and ($this->importerrors
>0)) {
364 echo $OUTPUT->notification(get_string('importparseerror', 'question'));
368 // get list of valid answer grades
369 $gradeoptionsfull = question_bank
::fraction_options_full();
371 // check answer grades are valid
372 // (now need to do this here because of 'stop on error': MDL-10689)
374 $goodquestions = array();
375 foreach ($questions as $question) {
376 if (!empty($question->fraction
) and (is_array($question->fraction
))) {
377 $fractions = $question->fraction
;
378 $invalidfractions = array();
379 foreach ($fractions as $key => $fraction) {
380 $newfraction = match_grade_options($gradeoptionsfull, $fraction,
382 if ($newfraction === false) {
383 $invalidfractions[] = $fraction;
385 $fractions[$key] = $newfraction;
388 if ($invalidfractions) {
389 echo $OUTPUT->notification(get_string('invalidgrade', 'question',
390 implode(', ', $invalidfractions)));
394 $question->fraction
= $fractions;
397 $goodquestions[] = $question;
399 $questions = $goodquestions;
401 // check for errors before we continue
402 if ($this->stoponerror
&& $gradeerrors > 0) {
406 // count number of questions processed
409 foreach ($questions as $question) { // Process and store each question
410 $transaction = $DB->start_delegated_transaction();
412 // reset the php timeout
413 core_php_time_limit
::raise();
415 // check for category modifiers
416 if ($question->qtype
== 'category') {
417 if ($this->catfromfile
) {
418 // find/create category object
419 $catpath = $question->category
;
420 $newcategory = $this->create_category_path($catpath, $question);
421 if (!empty($newcategory)) {
422 $this->category
= $newcategory;
425 $transaction->allow_commit();
428 $question->context
= $this->importcontext
;
432 if ($this->displayprogress
) {
433 echo "<hr /><p><b>{$count}</b>. " . $this->format_question_text($question) . "</p>";
436 $question->category
= $this->category
->id
;
437 $question->stamp
= make_unique_id_code(); // Set the unique code (not to be changed)
439 $question->createdby
= $USER->id
;
440 $question->timecreated
= time();
441 $question->modifiedby
= $USER->id
;
442 $question->timemodified
= time();
443 if (isset($question->idnumber
)) {
444 if ((string) $question->idnumber
=== '') {
445 // Id number not really set. Get rid of it.
446 unset($question->idnumber
);
448 if ($DB->record_exists('question_bank_entries',
449 ['idnumber' => $question->idnumber
, 'questioncategoryid' => $question->category
])) {
450 // We cannot have duplicate idnumbers in a category. Just remove it.
451 unset($question->idnumber
);
456 $fileoptions = array(
462 $question->id
= $DB->insert_record('question', $question);
463 // Create a bank entry for each question imported.
464 $questionbankentry = new \
stdClass();
465 $questionbankentry->questioncategoryid
= $question->category
;
466 $questionbankentry->idnumber
= $question->idnumber ??
null;
467 $questionbankentry->ownerid
= $question->createdby
;
468 $questionbankentry->id
= $DB->insert_record('question_bank_entries', $questionbankentry);
469 // Create a version for each question imported.
470 $questionversion = new \
stdClass();
471 $questionversion->questionbankentryid
= $questionbankentry->id
;
472 $questionversion->questionid
= $question->id
;
473 $questionversion->version
= 1;
474 $questionversion->status
= \core_question\local\bank\question_version_status
::QUESTION_STATUS_READY
;
475 $questionversion->id
= $DB->insert_record('question_versions', $questionversion);
477 $event = \core\event\question_created
::create_from_question_instance($question, $this->importcontext
);
480 if (isset($question->questiontextitemid
)) {
481 $question->questiontext
= file_save_draft_area_files($question->questiontextitemid
,
482 $this->importcontext
->id
, 'question', 'questiontext', $question->id
,
483 $fileoptions, $question->questiontext
);
484 } else if (isset($question->questiontextfiles
)) {
485 foreach ($question->questiontextfiles
as $file) {
486 question_bank
::get_qtype($question->qtype
)->import_file(
487 $this->importcontext
, 'question', 'questiontext', $question->id
, $file);
490 if (isset($question->generalfeedbackitemid
)) {
491 $question->generalfeedback
= file_save_draft_area_files($question->generalfeedbackitemid
,
492 $this->importcontext
->id
, 'question', 'generalfeedback', $question->id
,
493 $fileoptions, $question->generalfeedback
);
494 } else if (isset($question->generalfeedbackfiles
)) {
495 foreach ($question->generalfeedbackfiles
as $file) {
496 question_bank
::get_qtype($question->qtype
)->import_file(
497 $this->importcontext
, 'question', 'generalfeedback', $question->id
, $file);
500 $DB->update_record('question', $question);
502 $this->questionids
[] = $question->id
;
504 // Now to save all the answers and type-specific options
506 $result = question_bank
::get_qtype($question->qtype
)->save_question_options($question);
508 if (core_tag_tag
::is_enabled('core_question', 'question')) {
509 // Is the current context we're importing in a course context?
510 $importingcontext = $this->importcontext
;
511 $importingcoursecontext = $importingcontext->get_course_context(false);
512 $isimportingcontextcourseoractivity = !empty($importingcoursecontext);
514 if (!empty($question->coursetags
)) {
515 if ($isimportingcontextcourseoractivity) {
516 $mergedtags = array_merge($question->coursetags
, $question->tags
);
518 core_tag_tag
::set_item_tags('core_question', 'question', $question->id
,
519 $question->context
, $mergedtags);
521 core_tag_tag
::set_item_tags('core_question', 'question', $question->id
,
522 context_course
::instance($this->course
->id
), $question->coursetags
);
524 if (!empty($question->tags
)) {
525 core_tag_tag
::set_item_tags('core_question', 'question', $question->id
,
526 $importingcontext, $question->tags
);
529 } else if (!empty($question->tags
)) {
530 core_tag_tag
::set_item_tags('core_question', 'question', $question->id
,
531 $question->context
, $question->tags
);
535 if (!empty($result->error
)) {
536 echo $OUTPUT->notification($result->error
);
537 // Can't use $transaction->rollback(); since it requires an exception,
538 // and I don't want to rewrite this code to change the error handling now.
539 $DB->force_transaction_rollback();
543 $transaction->allow_commit();
545 if (!empty($result->notice
)) {
546 echo $OUTPUT->notification($result->notice
);
555 * Count all non-category questions in the questions array.
557 * @param array questions An array of question objects.
558 * @return int The count.
561 protected function count_questions($questions) {
563 if (!is_array($questions)) {
566 foreach ($questions as $question) {
567 if (!is_object($question) ||
!isset($question->qtype
) ||
568 ($question->qtype
== 'category')) {
577 * find and/or create the category described by a delimited list
578 * e.g. $course$/tom/dick/harry or tom/dick/harry
580 * removes any context string no matter whether $getcontext is set
581 * but if $getcontext is set then ignore the context and use selected category context.
583 * @param string catpath delimited category path
584 * @param object $lastcategoryinfo Contains category information
585 * @return mixed category object or null if fails
587 protected function create_category_path($catpath, $lastcategoryinfo = null) {
589 $catnames = $this->split_category_path($catpath);
593 // check for context id in path, it might not be there in pre 1.9 exports
594 $matchcount = preg_match('/^\$([a-z]+)\$$/', $catnames[0], $matches);
595 if ($matchcount == 1) {
596 $contextid = $this->translator
->string_to_context($matches[1]);
597 array_shift($catnames);
602 // Before 3.5, question categories could be created at top level.
603 // From 3.5 onwards, all question categories should be a child of a special category called the "top" category.
604 if (isset($catnames[0]) && (($catnames[0] != 'top') ||
(count($catnames) < 3))) {
605 array_unshift($catnames, 'top');
608 if ($this->contextfromfile
&& $contextid !== false) {
609 $context = context
::instance_by_id($contextid);
610 require_capability('moodle/question:add', $context);
612 $context = context
::instance_by_id($this->category
->contextid
);
614 $this->importcontext
= $context;
616 // Now create any categories that need to be created.
617 foreach ($catnames as $key => $catname) {
619 $category = question_get_top_category($context->id
, true);
620 $parent = $category->id
;
621 } else if ($category = $DB->get_record('question_categories',
622 array('name' => $catname, 'contextid' => $context->id
, 'parent' => $parent))) {
623 // If this category is now the last one in the path we are processing ...
624 if ($key == (count($catnames) - 1) && $lastcategoryinfo) {
625 // Do nothing unless the child category appears before the parent category
626 // in the imported xml file. Because the parent was created without info being available
627 // at that time, this allows the info to be added from the xml data.
628 if (isset($lastcategoryinfo->info
) && $lastcategoryinfo->info
!== ''
629 && $category->info
=== '') {
630 $category->info
= $lastcategoryinfo->info
;
631 if (isset($lastcategoryinfo->infoformat
) && $lastcategoryinfo->infoformat
!== '') {
632 $category->infoformat
= $lastcategoryinfo->infoformat
;
635 // Same for idnumber.
636 if (isset($lastcategoryinfo->idnumber
) && $lastcategoryinfo->idnumber
!== ''
637 && $category->idnumber
=== '') {
638 $category->idnumber
= $lastcategoryinfo->idnumber
;
640 $DB->update_record('question_categories', $category);
642 $parent = $category->id
;
644 if ($catname == 'top') {
645 // Should not happen, but if it does just move on.
646 // Occurs when there has been some import/export that has created
647 // multiple nested 'top' categories (due to old bug solved by MDL-63165).
648 // This basically silently cleans up old errors. Not throwing an exception here.
651 require_capability('moodle/question:managecategory', $context);
652 // Create the new category. This will create all the categories in the catpath,
653 // though only the final category will have any info added if available.
654 $category = new stdClass();
655 $category->contextid
= $context->id
;
656 $category->name
= $catname;
657 $category->info
= '';
658 // Only add info (category description) for the final category in the catpath.
659 if ($key == (count($catnames) - 1) && $lastcategoryinfo) {
660 if (isset($lastcategoryinfo->info
) && $lastcategoryinfo->info
!== '') {
661 $category->info
= $lastcategoryinfo->info
;
662 if (isset($lastcategoryinfo->infoformat
) && $lastcategoryinfo->infoformat
!== '') {
663 $category->infoformat
= $lastcategoryinfo->infoformat
;
666 // Same for idnumber.
667 if (isset($lastcategoryinfo->idnumber
) && $lastcategoryinfo->idnumber
!== '') {
668 $category->idnumber
= $lastcategoryinfo->idnumber
;
671 $category->parent
= $parent;
672 $category->sortorder
= 999;
673 $category->stamp
= make_unique_id_code();
674 $category->id
= $DB->insert_record('question_categories', $category);
675 $parent = $category->id
;
676 $event = \core\event\question_category_created
::create_from_question_category_instance($category, $context);
684 * Return complete file within an array, one item per line
685 * @param string filename name of file
686 * @return mixed contents array or false on failure
688 protected function readdata($filename) {
689 if (is_readable($filename)) {
690 $filearray = file($filename);
692 // If the first line of the file starts with a UTF-8 BOM, remove it.
693 $filearray[0] = core_text
::trim_utf8_bom($filearray[0]);
695 // Check for Macintosh OS line returns (ie file on one line), and fix.
696 if (preg_match("~\r~", $filearray[0]) AND !preg_match("~\n~", $filearray[0])) {
697 return explode("\r", $filearray[0]);
706 * Parses an array of lines into an array of questions,
707 * where each item is a question object as defined by
708 * readquestion(). Questions are defined as anything
709 * between blank lines.
711 * NOTE this method used to take $context as a second argument. However, at
712 * the point where this method was called, it was impossible to know what
713 * context the quetsions were going to be saved into, so the value could be
714 * wrong. Also, none of the standard question formats were using this argument,
715 * so it was removed. See MDL-32220.
717 * If your format does not use blank lines as a delimiter
718 * then you will need to override this method. Even then
719 * try to use readquestion for each question
720 * @param array lines array of lines from readdata
721 * @return array array of question objects
723 protected function readquestions($lines) {
725 $questions = array();
726 $currentquestion = array();
728 foreach ($lines as $line) {
731 if (!empty($currentquestion)) {
732 if ($question = $this->readquestion($currentquestion)) {
733 $questions[] = $question;
735 $currentquestion = array();
738 $currentquestion[] = $line;
742 if (!empty($currentquestion)) { // There may be a final question
743 if ($question = $this->readquestion($currentquestion)) {
744 $questions[] = $question;
752 * return an "empty" question
753 * Somewhere to specify question parameters that are not handled
754 * by import but are required db fields.
755 * This should not be overridden.
756 * @return object default question
758 protected function defaultquestion() {
760 static $defaultshuffleanswers = null;
761 if (is_null($defaultshuffleanswers)) {
762 $defaultshuffleanswers = get_config('quiz', 'shuffleanswers');
765 $question = new stdClass();
766 $question->shuffleanswers
= $defaultshuffleanswers;
767 $question->defaultmark
= 1;
768 $question->image
= '';
769 $question->usecase
= 0;
770 $question->multiplier
= array();
771 $question->questiontextformat
= FORMAT_MOODLE
;
772 $question->generalfeedback
= '';
773 $question->generalfeedbackformat
= FORMAT_MOODLE
;
774 $question->answernumbering
= 'abc';
775 $question->penalty
= 0.3333333;
776 $question->length
= 1;
778 // this option in case the questiontypes class wants
779 // to know where the data came from
780 $question->export_process
= true;
781 $question->import_process
= true;
783 $this->add_blank_combined_feedback($question);
789 * Construct a reasonable default question name, based on the start of the question text.
790 * @param string $questiontext the question text.
791 * @param string $default default question name to use if the constructed one comes out blank.
792 * @return string a reasonable question name.
794 public function create_default_question_name($questiontext, $default) {
795 $name = $this->clean_question_name(shorten_text($questiontext, 80));
804 * Ensure that a question name does not contain anything nasty, and will fit in the DB field.
805 * @param string $name the raw question name.
806 * @return string a safe question name.
808 public function clean_question_name($name) {
809 $name = clean_param($name, PARAM_TEXT
); // Matches what the question editing form does.
812 while (core_text
::strlen($name) > 255 && $trimlength > 0) {
813 $name = shorten_text($name, $trimlength);
820 * Add a blank combined feedback to a question object.
821 * @param object question
822 * @return object question
824 protected function add_blank_combined_feedback($question) {
825 $question->correctfeedback
= [
827 'format' => $question->questiontextformat
,
830 $question->partiallycorrectfeedback
= [
832 'format' => $question->questiontextformat
,
835 $question->incorrectfeedback
= [
837 'format' => $question->questiontextformat
,
844 * Given the data known to define a question in
845 * this format, this function converts it into a question
846 * object suitable for processing and insertion into Moodle.
848 * If your format does not use blank lines to delimit questions
849 * (e.g. an XML format) you must override 'readquestions' too
850 * @param $lines mixed data that represents question
851 * @return object question object
853 protected function readquestion($lines) {
854 // We should never get there unless the qformat plugin is broken.
855 throw new coding_exception('Question format plugin is missing important code: readquestion.');
861 * Override if any post-processing is required
862 * @return bool success
864 public function importpostprocess() {
873 * Provide export functionality for plugin questiontypes
875 * @param name questiontype name
876 * @param question object data to export
877 * @param extra mixed any addition format specific data needed
878 * @return string the data to append to export or false if error (or unhandled)
880 protected function try_exporting_using_qtypes($name, $question, $extra=null) {
881 // work out the name of format in use
882 $formatname = substr(get_class($this), strlen('qformat_'));
883 $methodname = "export_to_{$formatname}";
885 $qtype = question_bank
::get_qtype($name, false);
886 if (method_exists($qtype, $methodname)) {
887 return $qtype->$methodname($question, $this, $extra);
893 * Do any pre-processing that may be required
894 * @param bool success
896 public function exportpreprocess() {
901 * Enable any processing to be done on the content
902 * just prior to the file being saved
903 * default is to do nothing
904 * @param string output text
905 * @param string processed output text
907 protected function presave_process($content) {
912 * Perform the export.
913 * For most types this should not need to be overrided.
915 * @param bool $checkcapabilities Whether to check capabilities when exporting the questions.
916 * @return string The content of the export.
918 public function exportprocess($checkcapabilities = true) {
921 // Raise time and memory, as exporting can be quite intensive.
922 core_php_time_limit
::raise();
923 raise_memory_limit(MEMORY_EXTRA
);
925 // Get the parents (from database) for this category.
927 if ($this->category
) {
928 $parents = question_categorylist_parents($this->category
->id
);
931 // get the questions (from database) in this category
932 // only get q's with no parents (no cloze subquestions specifically)
933 if ($this->category
) {
934 // Export only the latest version of a question.
935 $questions = get_questions_category($this->category
, true, true, true, true);
937 $questions = $this->questions
;
942 // results are first written into string (and then to a file)
943 // so create/initialize the string here
946 // track which category questions are in
947 // if it changes we will record the category change in the output
948 // file if selected. 0 means that it will get printed before the 1st question
951 // Array of categories written to file.
952 $writtencategories = [];
954 foreach ($questions as $question) {
956 $questionbankentry = question_bank
::load_question($question->id
);
957 $qcategory = $questionbankentry->category
;
958 $contextid = $DB->get_field('question_categories', 'contextid', ['id' => $qcategory]);
959 $question->contextid
= $contextid;
960 $question->idnumber
= $questionbankentry->idnumber
;
961 if ($question->status
=== \core_question\local\bank\question_version_status
::QUESTION_STATUS_READY
) {
962 $question->status
= 0;
964 $question->status
= 1;
967 // do not export hidden questions
968 if (!empty($question->hidden
)) {
972 // do not export random questions
973 if ($question->qtype
== 'random') {
977 // check if we need to record category change
978 if ($this->cattofile
) {
980 if ($question->category
!= $trackcategory) {
982 $trackcategory = $question->category
;
984 $trackcategoryparents = question_categorylist_parents($trackcategory);
985 // Check if we need to record empty parents categories.
986 foreach ($trackcategoryparents as $trackcategoryparent) {
987 // If parent wasn't written.
988 if (!in_array($trackcategoryparent, $writtencategories)) {
989 // If parent is empty.
990 if (!count($DB->get_records('question_bank_entries', ['questioncategoryid' => $trackcategoryparent]))) {
991 $categoryname = $this->get_category_path($trackcategoryparent, $this->contexttofile
);
992 $categoryinfo = $DB->get_record('question_categories', array('id' => $trackcategoryparent),
993 'name, info, infoformat, idnumber', MUST_EXIST
);
994 if ($categoryinfo->name
!= 'top') {
995 // Create 'dummy' question for parent category.
996 $dummyquestion = $this->create_dummy_question_representing_category($categoryname, $categoryinfo);
997 $expout .= $this->writequestion($dummyquestion) . "\n";
998 $writtencategories[] = $trackcategoryparent;
1003 if ($addnewcat && !in_array($trackcategory, $writtencategories)) {
1004 $categoryname = $this->get_category_path($trackcategory, $this->contexttofile
);
1005 $categoryinfo = $DB->get_record('question_categories', array('id' => $trackcategory),
1006 'info, infoformat, idnumber', MUST_EXIST
);
1007 // Create 'dummy' question for category.
1008 $dummyquestion = $this->create_dummy_question_representing_category($categoryname, $categoryinfo);
1009 $expout .= $this->writequestion($dummyquestion) . "\n";
1010 $writtencategories[] = $trackcategory;
1014 // Add the question to result.
1015 if (!$checkcapabilities ||
question_has_capability_on($question, 'view')) {
1016 $expquestion = $this->writequestion($question, $contextid);
1017 // Don't add anything if witequestion returned nothing.
1018 // This will permit qformat plugins to exclude some questions.
1019 if ($expquestion !== null) {
1020 $expout .= $expquestion . "\n";
1026 // continue path for following error checks
1027 $course = $this->course
;
1028 $continuepath = "{$CFG->wwwroot}/question/bank/exportquestions/export.php?courseid={$course->id}";
1030 // did we actually process anything
1032 print_error('noquestions', 'question', $continuepath);
1035 // final pre-process on exported data
1036 $expout = $this->presave_process($expout);
1041 * Create 'dummy' question for category export.
1042 * @param string $categoryname the name of the category
1043 * @param object $categoryinfo description of the category
1044 * @return stdClass 'dummy' question for category
1046 protected function create_dummy_question_representing_category(string $categoryname, $categoryinfo) {
1047 $dummyquestion = new stdClass();
1048 $dummyquestion->qtype
= 'category';
1049 $dummyquestion->category
= $categoryname;
1050 $dummyquestion->id
= 0;
1051 $dummyquestion->questiontextformat
= '';
1052 $dummyquestion->contextid
= 0;
1053 $dummyquestion->info
= $categoryinfo->info
;
1054 $dummyquestion->infoformat
= $categoryinfo->infoformat
;
1055 $dummyquestion->idnumber
= $categoryinfo->idnumber
;
1056 $dummyquestion->name
= 'Switch category to ' . $categoryname;
1057 return $dummyquestion;
1061 * get the category as a path (e.g., tom/dick/harry)
1062 * @param int id the id of the most nested catgory
1063 * @return string the path
1065 protected function get_category_path($id, $includecontext = true) {
1068 if (!$category = $DB->get_record('question_categories', array('id' => $id))) {
1069 print_error('cannotfindcategory', 'error', '', $id);
1071 $contextstring = $this->translator
->context_to_string($category->contextid
);
1073 $pathsections = array();
1075 $pathsections[] = $category->name
;
1076 $id = $category->parent
;
1077 } while ($category = $DB->get_record('question_categories', array('id' => $id)));
1079 if ($includecontext) {
1080 $pathsections[] = '$' . $contextstring . '$';
1083 $path = $this->assemble_category_path(array_reverse($pathsections));
1089 * Convert a list of category names, possibly preceeded by one of the
1090 * context tokens like $course$, into a string representation of the
1093 * Names are separated by / delimiters. And /s in the name are replaced by //.
1095 * To reverse the process and split the paths into names, use
1096 * {@link split_category_path()}.
1098 * @param array $names
1101 protected function assemble_category_path($names) {
1102 $escapednames = array();
1103 foreach ($names as $name) {
1104 $escapedname = str_replace('/', '//', $name);
1105 if (substr($escapedname, 0, 1) == '/') {
1106 $escapedname = ' ' . $escapedname;
1108 if (substr($escapedname, -1) == '/') {
1109 $escapedname = $escapedname . ' ';
1111 $escapednames[] = $escapedname;
1113 return implode('/', $escapednames);
1117 * Convert a string, as returned by {@link assemble_category_path()},
1118 * back into an array of category names.
1120 * Each category name is cleaned by a call to clean_param(, PARAM_TEXT),
1121 * which matches the cleaning in question/bank/managecategories/category_form.php.
1123 * @param string $path
1124 * @return array of category names.
1126 protected function split_category_path($path) {
1127 $rawnames = preg_split('~(?<!/)/(?!/)~', $path);
1129 foreach ($rawnames as $rawname) {
1130 $names[] = clean_param(trim(str_replace('//', '/', $rawname)), PARAM_TEXT
);
1136 * Do an post-processing that may be required
1137 * @return bool success
1139 protected function exportpostprocess() {
1144 * convert a single question object into text output in the given
1146 * This must be overriden
1147 * @param object question question object
1148 * @return mixed question export text or null if not implemented
1150 protected function writequestion($question) {
1151 // if not overidden, then this is an error.
1152 throw new coding_exception('Question format plugin is missing important code: writequestion.');
1157 * Convert the question text to plain text, so it can safely be displayed
1158 * during import to let the user see roughly what is going on.
1160 protected function format_question_text($question) {
1161 return s(question_utils
::to_plain_text($question->questiontext
,
1162 $question->questiontextformat
));
1166 class qformat_based_on_xml
extends qformat_default
{
1169 * A lot of imported files contain unwanted entities.
1170 * This method tries to clean up all known problems.
1171 * @param string str string to correct
1172 * @return string the corrected string
1174 public function cleaninput($str) {
1176 $html_code_list = array(
1184 $str = strtr($str, $html_code_list);
1185 // Use core_text entities_to_utf8 function to convert only numerical entities.
1186 $str = core_text
::entities_to_utf8($str, false);
1191 * Return the array moodle is expecting
1192 * for an HTML text. No processing is done on $text.
1193 * qformat classes that want to process $text
1194 * for instance to import external images files
1195 * and recode urls in $text must overwrite this method.
1196 * @param array $text some HTML text string
1197 * @return array with keys text, format and files.
1199 public function text_field($text) {
1201 'text' => trim($text),
1202 'format' => FORMAT_HTML
,
1208 * Return the value of a node, given a path to the node
1209 * if it doesn't exist return the default value.
1210 * @param array xml data to read
1211 * @param array path path to node expressed as array
1212 * @param mixed default
1213 * @param bool istext process as text
1214 * @param string error if set value must exist, return false and issue message if not
1215 * @return mixed value
1217 public function getpath($xml, $path, $default, $istext=false, $error='') {
1218 foreach ($path as $index) {
1219 if (!isset($xml[$index])) {
1220 if (!empty($error)) {
1221 $this->error($error);
1228 $xml = $xml[$index];
1232 if (!is_string($xml)) {
1233 $this->error(get_string('invalidxml', 'qformat_xml'));