forked from moodle/moodle
-
Notifications
You must be signed in to change notification settings - Fork 0
/
format.php
1241 lines (1104 loc) · 46.2 KB
/
format.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<?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/>.
/**
* Defines the base class for question import and export formats.
*
* @package moodlecore
* @subpackage questionbank
* @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();
/**
* Base class for question import and export formats.
*
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class qformat_default {
public $displayerrors = true;
public $category = null;
public $questions = array();
public $course = null;
public $filename = '';
public $realfilename = '';
public $matchgrades = 'error';
public $catfromfile = 0;
public $contextfromfile = 0;
public $cattofile = 0;
public $contexttofile = 0;
public $questionids = array();
public $importerrors = 0;
public $stoponerror = true;
public $translator = null;
public $canaccessbackupdata = true;
protected $importcontext = null;
/** @var bool $displayprogress Whether to display progress. */
public $displayprogress = true;
/** @var context[] */
public $contexts;
// functions to indicate import/export functionality
// override to return true if implemented
/** @return bool whether this plugin provides import functionality. */
public function provide_import() {
return false;
}
/** @return bool whether this plugin provides export functionality. */
public function provide_export() {
return false;
}
/** The string mime-type of the files that this plugin reads or writes. */
public function mime_type() {
return mimeinfo('type', $this->export_file_extension());
}
/**
* @return string the file extension (including .) that is normally used for
* files handled by this plugin.
*/
public function export_file_extension() {
return '.txt';
}
/**
* Check if the given file is capable of being imported by this plugin.
*
* Note that expensive or detailed integrity checks on the file should
* not be performed by this method. Simple file type or magic-number tests
* would be suitable.
*
* @param stored_file $file the file to check
* @return bool whether this plugin can import the file
*/
public function can_import_file($file) {
return ($file->get_mimetype() == $this->mime_type());
}
/**
* Validate the given file.
*
* For more expensive or detailed integrity checks.
*
* @param stored_file $file the file to check
* @return string the error message that occurred while validating the given file
*/
public function validate_file(stored_file $file): string {
return '';
}
/**
* Check if the given file has the required utf8 encoding.
*
* @param stored_file $file the file to check
* @return string the error message if the file encoding is not UTF-8
*/
protected function validate_is_utf8_file(stored_file $file): string {
if (!mb_check_encoding($file->get_content(), "UTF-8")) {
return get_string('importwrongfileencoding', 'question', $this->get_name());
}
return '';
}
/**
* Return the localized pluginname string for the question format.
*
* @return string the pluginname string for the question format
*/
protected function get_name(): string {
return get_string('pluginname', get_class($this));
}
// Accessor methods
/**
* set the category
* @param object category the category object
*/
public function setCategory($category) {
if (count($this->questions)) {
debugging('You shouldn\'t call setCategory after setQuestions');
}
$this->category = $category;
$this->importcontext = context::instance_by_id($this->category->contextid);
}
/**
* Set the specific questions to export. Should not include questions with
* parents (sub questions of cloze question type).
* Only used for question export.
* @param array of question objects
*/
public function setQuestions($questions) {
if ($this->category !== null) {
debugging('You shouldn\'t call setQuestions after setCategory');
}
$this->questions = $questions;
}
/**
* set the course class variable
* @param course object Moodle course variable
*/
public function setCourse($course) {
$this->course = $course;
}
/**
* set an array of contexts.
* @param context[] $contexts
*/
public function setContexts($contexts) {
$this->contexts = $contexts;
$this->translator = new core_question\local\bank\context_to_string_translator($this->contexts);
}
/**
* set the filename
* @param string filename name of file to import/export
*/
public function setFilename($filename) {
$this->filename = $filename;
}
/**
* set the "real" filename
* (this is what the user typed, regardless of wha happened next)
* @param string realfilename name of file as typed by user
*/
public function setRealfilename($realfilename) {
$this->realfilename = $realfilename;
}
/**
* set matchgrades
* @param string matchgrades error or nearest for grades
*/
public function setMatchgrades($matchgrades) {
$this->matchgrades = $matchgrades;
}
/**
* set catfromfile
* @param bool catfromfile allow categories embedded in import file
*/
public function setCatfromfile($catfromfile) {
$this->catfromfile = $catfromfile;
}
/**
* set contextfromfile
* @param bool $contextfromfile allow contexts embedded in import file
*/
public function setContextfromfile($contextfromfile) {
$this->contextfromfile = $contextfromfile;
}
/**
* set cattofile
* @param bool cattofile exports categories within export file
*/
public function setCattofile($cattofile) {
$this->cattofile = $cattofile;
}
/**
* set contexttofile
* @param bool cattofile exports categories within export file
*/
public function setContexttofile($contexttofile) {
$this->contexttofile = $contexttofile;
}
/**
* set stoponerror
* @param bool stoponerror stops database write if any errors reported
*/
public function setStoponerror($stoponerror) {
$this->stoponerror = $stoponerror;
}
/**
* @param bool $canaccess Whether the current use can access the backup data folder. Determines
* where export files are saved.
*/
public function set_can_access_backupdata($canaccess) {
$this->canaccessbackupdata = $canaccess;
}
/**
* Change whether to display progress messages.
* There is normally no need to use this function as the
* default for $displayprogress is true.
* Set to false for unit tests.
* @param bool $displayprogress
*/
public function set_display_progress($displayprogress) {
$this->displayprogress = $displayprogress;
}
/***********************
* IMPORTING FUNCTIONS
***********************/
/**
* Handle parsing error
*/
protected function error($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>";
$this->importerrors++;
}
/**
* Import for questiontype plugins
* Do not override.
* @param data mixed The segment of data containing the question
* @param question object processed (so far) by standard import code if appropriate
* @param extra mixed any additional format specific data that may be passed by the format
* @param qtypehint hint about a question type from format
* @return object question object suitable for save_options() or false if cannot handle
*/
public function try_importing_using_qtypes($data, $question = null, $extra = null,
$qtypehint = '') {
// work out what format we are using
$formatname = substr(get_class($this), strlen('qformat_'));
$methodname = "import_from_{$formatname}";
//first try importing using a hint from format
if (!empty($qtypehint)) {
$qtype = question_bank::get_qtype($qtypehint, false);
if (is_object($qtype) && method_exists($qtype, $methodname)) {
$question = $qtype->$methodname($data, $question, $this, $extra);
if ($question) {
return $question;
}
}
}
// loop through installed questiontypes checking for
// function to handle this question
foreach (question_bank::get_all_qtypes() as $qtype) {
if (method_exists($qtype, $methodname)) {
if ($question = $qtype->$methodname($data, $question, $this, $extra)) {
return $question;
}
}
}
return false;
}
/**
* Perform any required pre-processing
* @return bool success
*/
public function importpreprocess() {
return true;
}
/**
* Process the file
* This method should not normally be overidden
* @return bool success
*/
public function importprocess() {
global $USER, $DB, $OUTPUT;
// Raise time and memory, as importing can be quite intensive.
core_php_time_limit::raise();
raise_memory_limit(MEMORY_EXTRA);
// STAGE 1: Parse the file
if ($this->displayprogress) {
echo $OUTPUT->notification(get_string('parsingquestions', 'question'), 'notifysuccess');
}
if (! $lines = $this->readdata($this->filename)) {
echo $OUTPUT->notification(get_string('cannotread', 'question'));
return false;
}
if (!$questions = $this->readquestions($lines)) { // Extract all the questions
echo $OUTPUT->notification(get_string('noquestionsinfile', 'question'));
return false;
}
// STAGE 2: Write data to database
if ($this->displayprogress) {
echo $OUTPUT->notification(get_string('importingquestions', 'question',
$this->count_questions($questions)), 'notifysuccess');
}
// check for errors before we continue
if ($this->stoponerror and ($this->importerrors>0)) {
echo $OUTPUT->notification(get_string('importparseerror', 'question'));
return true;
}
// get list of valid answer grades
$gradeoptionsfull = question_bank::fraction_options_full();
// check answer grades are valid
// (now need to do this here because of 'stop on error': MDL-10689)
$gradeerrors = 0;
$goodquestions = array();
foreach ($questions as $question) {
if (!empty($question->fraction) and (is_array($question->fraction))) {
$fractions = $question->fraction;
$invalidfractions = array();
foreach ($fractions as $key => $fraction) {
$newfraction = match_grade_options($gradeoptionsfull, $fraction,
$this->matchgrades);
if ($newfraction === false) {
$invalidfractions[] = $fraction;
} else {
$fractions[$key] = $newfraction;
}
}
if ($invalidfractions) {
echo $OUTPUT->notification(get_string('invalidgrade', 'question',
implode(', ', $invalidfractions)));
++$gradeerrors;
continue;
} else {
$question->fraction = $fractions;
}
}
$goodquestions[] = $question;
}
$questions = $goodquestions;
// check for errors before we continue
if ($this->stoponerror && $gradeerrors > 0) {
return false;
}
// count number of questions processed
$count = 0;
foreach ($questions as $question) { // Process and store each question
$transaction = $DB->start_delegated_transaction();
// reset the php timeout
core_php_time_limit::raise();
// check for category modifiers
if ($question->qtype == 'category') {
if ($this->catfromfile) {
// find/create category object
$catpath = $question->category;
$newcategory = $this->create_category_path($catpath, $question);
if (!empty($newcategory)) {
$this->category = $newcategory;
}
}
$transaction->allow_commit();
continue;
}
$question->context = $this->importcontext;
$count++;
if ($this->displayprogress) {
echo "<hr /><p><b>{$count}</b>. " . $this->format_question_text($question) . "</p>";
}
$question->category = $this->category->id;
$question->stamp = make_unique_id_code(); // Set the unique code (not to be changed)
$question->createdby = $USER->id;
$question->timecreated = time();
$question->modifiedby = $USER->id;
$question->timemodified = time();
if (isset($question->idnumber)) {
if ((string) $question->idnumber === '') {
// Id number not really set. Get rid of it.
unset($question->idnumber);
} else {
if ($DB->record_exists('question_bank_entries',
['idnumber' => $question->idnumber, 'questioncategoryid' => $question->category])) {
// We cannot have duplicate idnumbers in a category. Just remove it.
unset($question->idnumber);
}
}
}
$fileoptions = array(
'subdirs' => true,
'maxfiles' => -1,
'maxbytes' => 0,
);
$question->id = $DB->insert_record('question', $question);
// Create a bank entry for each question imported.
$questionbankentry = new \stdClass();
$questionbankentry->questioncategoryid = $question->category;
$questionbankentry->idnumber = $question->idnumber ?? null;
$questionbankentry->ownerid = $question->createdby;
$questionbankentry->id = $DB->insert_record('question_bank_entries', $questionbankentry);
// Create a version for each question imported.
$questionversion = new \stdClass();
$questionversion->questionbankentryid = $questionbankentry->id;
$questionversion->questionid = $question->id;
$questionversion->version = 1;
$questionversion->status = \core_question\local\bank\question_version_status::QUESTION_STATUS_READY;
$questionversion->id = $DB->insert_record('question_versions', $questionversion);
if (isset($question->questiontextitemid)) {
$question->questiontext = file_save_draft_area_files($question->questiontextitemid,
$this->importcontext->id, 'question', 'questiontext', $question->id,
$fileoptions, $question->questiontext);
} else if (isset($question->questiontextfiles)) {
foreach ($question->questiontextfiles as $file) {
question_bank::get_qtype($question->qtype)->import_file(
$this->importcontext, 'question', 'questiontext', $question->id, $file);
}
}
if (isset($question->generalfeedbackitemid)) {
$question->generalfeedback = file_save_draft_area_files($question->generalfeedbackitemid,
$this->importcontext->id, 'question', 'generalfeedback', $question->id,
$fileoptions, $question->generalfeedback);
} else if (isset($question->generalfeedbackfiles)) {
foreach ($question->generalfeedbackfiles as $file) {
question_bank::get_qtype($question->qtype)->import_file(
$this->importcontext, 'question', 'generalfeedback', $question->id, $file);
}
}
$DB->update_record('question', $question);
$this->questionids[] = $question->id;
// Now to save all the answers and type-specific options
$result = question_bank::get_qtype($question->qtype)->save_question_options($question);
$event = \core\event\question_created::create_from_question_instance($question, $this->importcontext);
$event->trigger();
if (core_tag_tag::is_enabled('core_question', 'question')) {
// Is the current context we're importing in a course context?
$importingcontext = $this->importcontext;
$importingcoursecontext = $importingcontext->get_course_context(false);
$isimportingcontextcourseoractivity = !empty($importingcoursecontext);
if (!empty($question->coursetags)) {
if ($isimportingcontextcourseoractivity) {
$mergedtags = array_merge($question->coursetags, $question->tags);
core_tag_tag::set_item_tags('core_question', 'question', $question->id,
$question->context, $mergedtags);
} else {
core_tag_tag::set_item_tags('core_question', 'question', $question->id,
context_course::instance($this->course->id), $question->coursetags);
if (!empty($question->tags)) {
core_tag_tag::set_item_tags('core_question', 'question', $question->id,
$importingcontext, $question->tags);
}
}
} else if (!empty($question->tags)) {
core_tag_tag::set_item_tags('core_question', 'question', $question->id,
$question->context, $question->tags);
}
}
if (!empty($result->error)) {
echo $OUTPUT->notification($result->error);
// Can't use $transaction->rollback(); since it requires an exception,
// and I don't want to rewrite this code to change the error handling now.
$DB->force_transaction_rollback();
return false;
}
$transaction->allow_commit();
if (!empty($result->notice)) {
echo $OUTPUT->notification($result->notice);
return true;
}
}
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;
}
/**
* find and/or create the category described by a delimited list
* e.g. $course$/tom/dick/harry or tom/dick/harry
*
* removes any context string no matter whether $getcontext is set
* but if $getcontext is set then ignore the context and use selected category context.
*
* @param string catpath delimited category path
* @param object $lastcategoryinfo Contains category information
* @return mixed category object or null if fails
*/
protected function create_category_path($catpath, $lastcategoryinfo = null) {
global $DB;
$catnames = $this->split_category_path($catpath);
$parent = 0;
$category = null;
// check for context id in path, it might not be there in pre 1.9 exports
$matchcount = preg_match('/^\$([a-z]+)\$$/', $catnames[0], $matches);
if ($matchcount == 1) {
$contextid = $this->translator->string_to_context($matches[1]);
array_shift($catnames);
} else {
$contextid = false;
}
// Before 3.5, question categories could be created at top level.
// From 3.5 onwards, all question categories should be a child of a special category called the "top" category.
if (isset($catnames[0]) && (($catnames[0] != 'top') || (count($catnames) < 3))) {
array_unshift($catnames, 'top');
}
if ($this->contextfromfile && $contextid !== false) {
$context = context::instance_by_id($contextid);
require_capability('moodle/question:add', $context);
} else {
$context = context::instance_by_id($this->category->contextid);
}
$this->importcontext = $context;
// Now create any categories that need to be created.
foreach ($catnames as $key => $catname) {
if ($parent == 0) {
$category = question_get_top_category($context->id, true);
$parent = $category->id;
} else if ($category = $DB->get_record('question_categories',
array('name' => $catname, 'contextid' => $context->id, 'parent' => $parent))) {
// If this category is now the last one in the path we are processing ...
if ($key == (count($catnames) - 1) && $lastcategoryinfo) {
// Do nothing unless the child category appears before the parent category
// in the imported xml file. Because the parent was created without info being available
// at that time, this allows the info to be added from the xml data.
if (isset($lastcategoryinfo->info) && $lastcategoryinfo->info !== ''
&& $category->info === '') {
$category->info = $lastcategoryinfo->info;
if (isset($lastcategoryinfo->infoformat) && $lastcategoryinfo->infoformat !== '') {
$category->infoformat = $lastcategoryinfo->infoformat;
}
}
// Same for idnumber.
if (isset($lastcategoryinfo->idnumber) && $lastcategoryinfo->idnumber !== ''
&& $category->idnumber === '') {
$category->idnumber = $lastcategoryinfo->idnumber;
}
$DB->update_record('question_categories', $category);
}
$parent = $category->id;
} else {
if ($catname == 'top') {
// Should not happen, but if it does just move on.
// Occurs when there has been some import/export that has created
// multiple nested 'top' categories (due to old bug solved by MDL-63165).
// This basically silently cleans up old errors. Not throwing an exception here.
continue;
}
require_capability('moodle/question:managecategory', $context);
// Create the new category. This will create all the categories in the catpath,
// though only the final category will have any info added if available.
$category = new stdClass();
$category->contextid = $context->id;
$category->name = $catname;
$category->info = '';
// Only add info (category description) for the final category in the catpath.
if ($key == (count($catnames) - 1) && $lastcategoryinfo) {
if (isset($lastcategoryinfo->info) && $lastcategoryinfo->info !== '') {
$category->info = $lastcategoryinfo->info;
if (isset($lastcategoryinfo->infoformat) && $lastcategoryinfo->infoformat !== '') {
$category->infoformat = $lastcategoryinfo->infoformat;
}
}
// Same for idnumber.
if (isset($lastcategoryinfo->idnumber) && $lastcategoryinfo->idnumber !== '') {
$category->idnumber = $lastcategoryinfo->idnumber;
}
}
$category->parent = $parent;
$category->sortorder = 999;
$category->stamp = make_unique_id_code();
$category->id = $DB->insert_record('question_categories', $category);
$parent = $category->id;
$event = \core\event\question_category_created::create_from_question_category_instance($category, $context);
$event->trigger();
}
}
return $category;
}
/**
* Return complete file within an array, one item per line
* @param string filename name of file
* @return mixed contents array or false on failure
*/
protected function readdata($filename) {
if (is_readable($filename)) {
$filearray = file($filename);
// If the first line of the file starts with a UTF-8 BOM, remove it.
$filearray[0] = core_text::trim_utf8_bom($filearray[0]);
// 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->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;
$this->add_blank_combined_feedback($question);
return $question;
}
/**
* 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 $name;
}
/**
* Add a blank combined feedback to a question object.
* @param object question
* @return object question
*/
protected function add_blank_combined_feedback($question) {
$question->correctfeedback = [
'text' => '',
'format' => $question->questiontextformat,
'files' => []
];
$question->partiallycorrectfeedback = [
'text' => '',
'format' => $question->questiontextformat,
'files' => []
];
$question->incorrectfeedback = [
'text' => '',
'format' => $question->questiontextformat,
'files' => []
];
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) {
// 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;
}
/**
* 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;
}
/**
* Perform the export.
* For most types this should not need to be overrided.
*
* @param bool $checkcapabilities Whether to check capabilities when exporting the questions.
* @return string The content of the export.
*/
public function exportprocess($checkcapabilities = true) {
global $CFG, $DB;
// Raise time and memory, as exporting can be quite intensive.
core_php_time_limit::raise();
raise_memory_limit(MEMORY_EXTRA);
// Get the parents (from database) for this category.
$parents = [];
if ($this->category) {
$parents = question_categorylist_parents($this->category->id);
}
// get the questions (from database) in this category
// only get q's with no parents (no cloze subquestions specifically)
if ($this->category) {
// Export only the latest version of a question.
$questions = get_questions_category($this->category, true, true, true, 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;
// Array of categories written to file.
$writtencategories = [];
foreach ($questions as $question) {
// used by file api
$questionbankentry = question_bank::load_question($question->id);
$qcategory = $questionbankentry->category;
$contextid = $DB->get_field('question_categories', 'contextid', ['id' => $qcategory]);
$question->contextid = $contextid;
$question->idnumber = $questionbankentry->idnumber;
if ($question->status === \core_question\local\bank\question_version_status::QUESTION_STATUS_READY) {
$question->status = 0;
} else {
$question->status = 1;
}
// do not export hidden questions
if (!empty($question->hidden)) {
continue;
}
// do not export random questions
if ($question->qtype == 'random') {
continue;
}
// check if we need to record category change
if ($this->cattofile) {
$addnewcat = false;
if ($question->category != $trackcategory) {
$addnewcat = true;
$trackcategory = $question->category;
}
$trackcategoryparents = question_categorylist_parents($trackcategory);
// Check if we need to record empty parents categories.
foreach ($trackcategoryparents as $trackcategoryparent) {
// If parent wasn't written.
if (!in_array($trackcategoryparent, $writtencategories)) {
// If parent is empty.
if (!count($DB->get_records('question_bank_entries', ['questioncategoryid' => $trackcategoryparent]))) {
$categoryname = $this->get_category_path($trackcategoryparent, $this->contexttofile);
$categoryinfo = $DB->get_record('question_categories', array('id' => $trackcategoryparent),
'name, info, infoformat, idnumber', MUST_EXIST);
if ($categoryinfo->name != 'top') {
// Create 'dummy' question for parent category.
$dummyquestion = $this->create_dummy_question_representing_category($categoryname, $categoryinfo);
$expout .= $this->writequestion($dummyquestion) . "\n";
$writtencategories[] = $trackcategoryparent;
}