MDL-20636 Question import, support for files in hints.
[moodle.git] / question / format.php
CommitLineData
aeb15530 1<?php
d3603157
TH
2
3// This file is part of Moodle - http://moodle.org/
4//
5// Moodle is free software: you can redistribute it and/or modify
6// it under the terms of the GNU General Public License as published by
7// the Free Software Foundation, either version 3 of the License, or
8// (at your option) any later version.
9//
10// Moodle is distributed in the hope that it will be useful,
11// but WITHOUT ANY WARRANTY; without even the implied warranty of
12// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13// GNU General Public License for more details.
14//
15// You should have received a copy of the GNU General Public License
16// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
17
18/**
19 * Defines the base class for question import and export formats.
20 *
21 * @package moodlecore
22 * @subpackage questionbank
23 * @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
24 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
25 */
26
27
a17b297d
TH
28defined('MOODLE_INTERNAL') || die();
29
30
4323d029 31/**
32 * Base class for question import and export formats.
33 *
d3603157
TH
34 * @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
35 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
4323d029 36 */
f5565b69 37class qformat_default {
aca318e1 38
13bb604e
TH
39 public $displayerrors = true;
40 public $category = NULL;
41 public $questions = array();
42 public $course = NULL;
43 public $filename = '';
44 public $realfilename = '';
45 public $matchgrades = 'error';
46 public $catfromfile = 0;
47 public $contextfromfile = 0;
48 public $cattofile = 0;
49 public $contexttofile = 0;
50 public $questionids = array();
51 public $importerrors = 0;
52 public $stoponerror = true;
53 public $translator = null;
54 public $canaccessbackupdata = true;
271e6dec 55
cde2709a 56 protected $importcontext = null;
aca318e1 57
58// functions to indicate import/export functionality
59// override to return true if implemented
60
f7970e3c 61 /** @return bool whether this plugin provides import functionality. */
aca318e1 62 function provide_import() {
46732124 63 return false;
aca318e1 64 }
65
f7970e3c 66 /** @return bool whether this plugin provides export functionality. */
aca318e1 67 function provide_export() {
46732124
TH
68 return false;
69 }
70
71 /** The string mime-type of the files that this plugin reads or writes. */
72 function mime_type() {
73 return mimeinfo('type', $this->export_file_extension());
74 }
75
76 /**
77 * @return string the file extension (including .) that is normally used for
78 * files handled by this plugin.
79 */
80 function export_file_extension() {
81 return '.txt';
aca318e1 82 }
83
08892d5b 84// Accessor methods
aca318e1 85
08892d5b 86 /**
87 * set the category
88 * @param object category the category object
89 */
13bb604e
TH
90 function setCategory($category) {
91 if (count($this->questions)) {
88bc20c3 92 debugging('You shouldn\'t call setCategory after setQuestions');
93 }
08892d5b 94 $this->category = $category;
95 }
aca318e1 96
2c44a3d3 97 /**
98 * Set the specific questions to export. Should not include questions with
99 * parents (sub questions of cloze question type).
100 * Only used for question export.
101 * @param array of question objects
102 */
13bb604e
TH
103 function setQuestions($questions) {
104 if ($this->category !== null) {
88bc20c3 105 debugging('You shouldn\'t call setQuestions after setCategory');
106 }
2c44a3d3 107 $this->questions = $questions;
108 }
109
08892d5b 110 /**
111 * set the course class variable
112 * @param course object Moodle course variable
113 */
13bb604e 114 function setCourse($course) {
aca318e1 115 $this->course = $course;
08892d5b 116 }
13bb604e 117
271e6dec 118 /**
119 * set an array of contexts.
120 * @param array $contexts Moodle course variable
121 */
122 function setContexts($contexts) {
123 $this->contexts = $contexts;
124 $this->translator = new context_to_string_translator($this->contexts);
125 }
aca318e1 126
08892d5b 127 /**
128 * set the filename
129 * @param string filename name of file to import/export
130 */
13bb604e 131 function setFilename($filename) {
08892d5b 132 $this->filename = $filename;
133 }
88bc20c3 134
135 /**
73b7b195 136 * set the "real" filename
137 * (this is what the user typed, regardless of wha happened next)
138 * @param string realfilename name of file as typed by user
139 */
13bb604e 140 function setRealfilename($realfilename) {
88bc20c3 141 $this->realfilename = $realfilename;
142 }
08892d5b 143
144 /**
145 * set matchgrades
146 * @param string matchgrades error or nearest for grades
147 */
13bb604e 148 function setMatchgrades($matchgrades) {
08892d5b 149 $this->matchgrades = $matchgrades;
aca318e1 150 }
151
76f0a334 152 /**
08892d5b 153 * set catfromfile
154 * @param bool catfromfile allow categories embedded in import file
76f0a334 155 */
13bb604e 156 function setCatfromfile($catfromfile) {
08892d5b 157 $this->catfromfile = $catfromfile;
158 }
271e6dec 159
160 /**
161 * set contextfromfile
162 * @param bool $contextfromfile allow contexts embedded in import file
163 */
164 function setContextfromfile($contextfromfile) {
165 $this->contextfromfile = $contextfromfile;
166 }
167
f1abd39f 168 /**
169 * set cattofile
170 * @param bool cattofile exports categories within export file
171 */
13bb604e 172 function setCattofile($cattofile) {
f1abd39f 173 $this->cattofile = $cattofile;
271e6dec 174 }
13bb604e 175
271e6dec 176 /**
177 * set contexttofile
178 * @param bool cattofile exports categories within export file
179 */
180 function setContexttofile($contexttofile) {
181 $this->contexttofile = $contexttofile;
182 }
aca318e1 183
f3701561 184 /**
185 * set stoponerror
186 * @param bool stoponerror stops database write if any errors reported
187 */
13bb604e 188 function setStoponerror($stoponerror) {
f3701561 189 $this->stoponerror = $stoponerror;
190 }
191
1b8b535d 192 /**
f7970e3c 193 * @param bool $canaccess Whether the current use can access the backup data folder. Determines
1b8b535d 194 * where export files are saved.
195 */
196 function set_can_access_backupdata($canaccess) {
197 $this->canaccessbackupdata = $canaccess;
198 }
199
f3701561 200/***********************
201 * IMPORTING FUNCTIONS
202 ***********************/
203
204 /**
205 * Handle parsing error
206 */
13bb604e 207 function error($message, $text='', $questionname='') {
5e8a85aa 208 $importerrorquestion = get_string('importerrorquestion', 'question');
cdeabc06 209
f3701561 210 echo "<div class=\"importerror\">\n";
cdeabc06 211 echo "<strong>$importerrorquestion $questionname</strong>";
f3701561 212 if (!empty($text)) {
213 $text = s($text);
214 echo "<blockquote>$text</blockquote>\n";
215 }
216 echo "<strong>$message</strong>\n";
217 echo "</div>";
218
219 $this->importerrors++;
220 }
08892d5b 221
271e6dec 222 /**
a41e3287 223 * Import for questiontype plugins
224 * Do not override.
225 * @param data mixed The segment of data containing the question
226 * @param question object processed (so far) by standard import code if appropriate
227 * @param extra mixed any additional format specific data that may be passed by the format
88bc20c3 228 * @param qtypehint hint about a question type from format
a41e3287 229 * @return object question object suitable for save_options() or false if cannot handle
230 */
49e2bba7
TH
231 function try_importing_using_qtypes($data, $question = null, $extra = null,
232 $qtypehint = '') {
a41e3287 233
234 // work out what format we are using
88bc20c3 235 $formatname = substr(get_class($this), strlen('qformat_'));
a41e3287 236 $methodname = "import_from_$formatname";
237
88bc20c3 238 //first try importing using a hint from format
239 if (!empty($qtypehint)) {
49e2bba7 240 $qtype = question_bank::get_qtype($qtypehint, false);
88bc20c3 241 if (is_object($qtype) && method_exists($qtype, $methodname)) {
242 $question = $qtype->$methodname($data, $question, $this, $extra);
243 if ($question) {
244 return $question;
245 }
246 }
247 }
248
a41e3287 249 // loop through installed questiontypes checking for
250 // function to handle this question
49e2bba7 251 foreach (question_bank::get_all_qtypes() as $qtype) {
13bb604e
TH
252 if (method_exists($qtype, $methodname)) {
253 if ($question = $qtype->$methodname($data, $question, $this, $extra)) {
a41e3287 254 return $question;
255 }
256 }
271e6dec 257 }
258 return false;
a41e3287 259 }
260
08892d5b 261 /**
262 * Perform any required pre-processing
f7970e3c 263 * @return bool success
08892d5b 264 */
265 function importpreprocess() {
266 return true;
267 }
268
269 /**
270 * Process the file
271 * This method should not normally be overidden
49e2bba7 272 * @param object $category
f7970e3c 273 * @return bool success
08892d5b 274 */
cde2709a 275 function importprocess($category) {
d649fb02 276 global $USER, $CFG, $DB, $OUTPUT;
cde2709a
DC
277
278 $context = $category->context;
279 $this->importcontext = $context;
f3701561 280
9dd46039
TH
281 // reset the timer in case file upload was slow
282 set_time_limit(0);
67c12527 283
9dd46039 284 // STAGE 1: Parse the file
5e8a85aa 285 echo $OUTPUT->notification(get_string('parsingquestions', 'question'), 'notifysuccess');
271e6dec 286
08892d5b 287 if (! $lines = $this->readdata($this->filename)) {
5e8a85aa 288 echo $OUTPUT->notification(get_string('cannotread', 'question'));
aca318e1 289 return false;
290 }
291
13bb604e 292 if (!$questions = $this->readquestions($lines, $context)) { // Extract all the questions
5e8a85aa 293 echo $OUTPUT->notification(get_string('noquestionsinfile', 'question'));
aca318e1 294 return false;
295 }
296
f3701561 297 // STAGE 2: Write data to database
5e8a85aa 298 echo $OUTPUT->notification(get_string('importingquestions', 'question',
f7c1dfaf 299 $this->count_questions($questions)), 'notifysuccess');
aca318e1 300
f3701561 301 // check for errors before we continue
302 if ($this->stoponerror and ($this->importerrors>0)) {
5e8a85aa 303 echo $OUTPUT->notification(get_string('importparseerror', 'question'));
10b4a508 304 return true;
f3701561 305 }
306
76f0a334 307 // get list of valid answer grades
308 $grades = get_grade_options();
309 $gradeoptionsfull = $grades->gradeoptionsfull;
310
c1828e0b 311 // check answer grades are valid
312 // (now need to do this here because of 'stop on error': MDL-10689)
313 $gradeerrors = 0;
314 $goodquestions = array();
315 foreach ($questions as $question) {
316 if (!empty($question->fraction) and (is_array($question->fraction))) {
317 $fractions = $question->fraction;
318 $answersvalid = true; // in case they are!
319 foreach ($fractions as $key => $fraction) {
320 $newfraction = match_grade_options($gradeoptionsfull, $fraction, $this->matchgrades);
321 if ($newfraction===false) {
322 $answersvalid = false;
323 }
324 else {
325 $fractions[$key] = $newfraction;
326 }
327 }
328 if (!$answersvalid) {
5e8a85aa 329 echo $OUTPUT->notification(get_string('invalidgrade', 'question'));
c1828e0b 330 ++$gradeerrors;
331 continue;
332 }
333 else {
334 $question->fraction = $fractions;
335 }
336 }
337 $goodquestions[] = $question;
338 }
339 $questions = $goodquestions;
340
341 // check for errors before we continue
342 if ($this->stoponerror and ($gradeerrors>0)) {
343 return false;
344 }
345
346 // count number of questions processed
aca318e1 347 $count = 0;
348
349 foreach ($questions as $question) { // Process and store each question
08892d5b 350
271e6dec 351 // reset the php timeout
49e2bba7 352 set_time_limit(0);
67c12527 353
08892d5b 354 // check for category modifiers
9dd46039 355 if ($question->qtype == 'category') {
08892d5b 356 if ($this->catfromfile) {
357 // find/create category object
40e71443 358 $catpath = $question->category;
728d60a1 359 $newcategory = $this->create_category_path($catpath);
08892d5b 360 if (!empty($newcategory)) {
361 $this->category = $newcategory;
362 }
363 }
271e6dec 364 continue;
08892d5b 365 }
cde2709a 366 $question->context = $context;
08892d5b 367
aca318e1 368 $count++;
369
5b0dc681 370 echo "<hr /><p><b>$count</b>. ".$this->format_question_text($question)."</p>";
aca318e1 371
9dd46039 372 $question->category = $this->category->id;
aca318e1 373 $question->stamp = make_unique_id_code(); // Set the unique code (not to be changed)
aca318e1 374
271e6dec 375 $question->createdby = $USER->id;
376 $question->timecreated = time();
377
cde2709a
DC
378 $question->id = $DB->insert_record('question', $question);
379 if (isset($question->questiontextfiles)) {
380 foreach ($question->questiontextfiles as $file) {
d649fb02
TH
381 question_bank::get_qtype($question->qtype)->import_file(
382 $context, 'question', 'questiontext', $question->id, $file);
cde2709a
DC
383 }
384 }
385 if (isset($question->generalfeedbackfiles)) {
386 foreach ($question->generalfeedbackfiles as $file) {
d649fb02
TH
387 question_bank::get_qtype($question->qtype)->import_file(
388 $context, 'question', 'generalfeedback', $question->id, $file);
cde2709a
DC
389 }
390 }
aca318e1 391
392 $this->questionids[] = $question->id;
393
394 // Now to save all the answers and type-specific options
395
d649fb02 396 $result = question_bank::get_qtype($question->qtype)->save_question_options($question);
aca318e1 397
4f290077
TH
398 if (!empty($CFG->usetags) && isset($question->tags)) {
399 require_once($CFG->dirroot . '/tag/lib.php');
400 tag_set('question', $question->id, $question->tags);
401 }
402
aca318e1 403 if (!empty($result->error)) {
fef8f84e 404 echo $OUTPUT->notification($result->error);
aca318e1 405 return false;
406 }
407
408 if (!empty($result->notice)) {
fef8f84e 409 echo $OUTPUT->notification($result->notice);
aca318e1 410 return true;
411 }
cbe20043 412
413 // Give the question a unique version stamp determined by question_hash()
e5d7d1dc 414 $DB->set_field('question', 'version', question_hash($question), array('id'=>$question->id));
aca318e1 415 }
416 return true;
417 }
13bb604e 418
ce2df288 419 /**
420 * Count all non-category questions in the questions array.
f34488b2 421 *
ce2df288 422 * @param array questions An array of question objects.
423 * @return int The count.
f34488b2 424 *
ce2df288 425 */
426 function count_questions($questions) {
427 $count = 0;
428 if (!is_array($questions)) {
429 return $count;
430 }
431 foreach ($questions as $question) {
432 if (!is_object($question) || !isset($question->qtype) || ($question->qtype == 'category')) {
433 continue;
434 }
435 $count++;
436 }
437 return $count;
438 }
439
271e6dec 440 /**
441 * find and/or create the category described by a delimited list
442 * e.g. $course$/tom/dick/harry or tom/dick/harry
443 *
444 * removes any context string no matter whether $getcontext is set
445 * but if $getcontext is set then ignore the context and use selected category context.
446 *
447 * @param string catpath delimited category path
271e6dec 448 * @param int courseid course to search for categories
449 * @return mixed category object or null if fails
450 */
728d60a1 451 function create_category_path($catpath) {
f34488b2 452 global $DB;
728d60a1 453 $catnames = $this->split_category_path($catpath);
271e6dec 454 $parent = 0;
455 $category = null;
88bc20c3 456
5ca9e32d 457 // check for context id in path, it might not be there in pre 1.9 exports
458 $matchcount = preg_match('/^\$([a-z]+)\$$/', $catnames[0], $matches);
49e2bba7 459 if ($matchcount == 1) {
271e6dec 460 $contextid = $this->translator->string_to_context($matches[1]);
461 array_shift($catnames);
462 } else {
728d60a1 463 $contextid = false;
271e6dec 464 }
728d60a1
TH
465
466 if ($this->contextfromfile && $contextid !== false) {
271e6dec 467 $context = get_context_instance_by_id($contextid);
468 require_capability('moodle/question:add', $context);
469 } else {
470 $context = get_context_instance_by_id($this->category->contextid);
471 }
728d60a1
TH
472
473 // Now create any categories that need to be created.
271e6dec 474 foreach ($catnames as $catname) {
13bb604e 475 if ($category = $DB->get_record('question_categories', array('name' => $catname, 'contextid' => $context->id, 'parent' => $parent))) {
271e6dec 476 $parent = $category->id;
477 } else {
478 require_capability('moodle/question:managecategory', $context);
479 // create the new category
7f389342 480 $category = new stdClass();
271e6dec 481 $category->contextid = $context->id;
482 $category->name = $catname;
483 $category->info = '';
484 $category->parent = $parent;
485 $category->sortorder = 999;
486 $category->stamp = make_unique_id_code();
bf8e93d7 487 $id = $DB->insert_record('question_categories', $category);
271e6dec 488 $category->id = $id;
489 $parent = $id;
490 }
491 }
492 return $category;
493 }
3f5633df 494
f3701561 495 /**
496 * Return complete file within an array, one item per line
497 * @param string filename name of file
498 * @return mixed contents array or false on failure
499 */
aca318e1 500 function readdata($filename) {
aca318e1 501 if (is_readable($filename)) {
502 $filearray = file($filename);
503
504 /// Check for Macintosh OS line returns (ie file on one line), and fix
6dbcacee 505 if (preg_match("~\r~", $filearray[0]) AND !preg_match("~\n~", $filearray[0])) {
aca318e1 506 return explode("\r", $filearray[0]);
507 } else {
508 return $filearray;
509 }
510 }
511 return false;
512 }
513
f3701561 514 /**
271e6dec 515 * Parses an array of lines into an array of questions,
516 * where each item is a question object as defined by
517 * readquestion(). Questions are defined as anything
f3701561 518 * between blank lines.
519 *
520 * If your format does not use blank lines as a delimiter
521 * then you will need to override this method. Even then
522 * try to use readquestion for each question
523 * @param array lines array of lines from readdata
cde2709a 524 * @param object $context
f3701561 525 * @return array array of question objects
526 */
cde2709a 527 function readquestions($lines, $context) {
271e6dec 528
aca318e1 529 $questions = array();
530 $currentquestion = array();
531
532 foreach ($lines as $line) {
533 $line = trim($line);
534 if (empty($line)) {
535 if (!empty($currentquestion)) {
536 if ($question = $this->readquestion($currentquestion)) {
537 $questions[] = $question;
538 }
539 $currentquestion = array();
540 }
541 } else {
542 $currentquestion[] = $line;
543 }
544 }
545
546 if (!empty($currentquestion)) { // There may be a final question
cde2709a 547 if ($question = $this->readquestion($currentquestion, $context)) {
aca318e1 548 $questions[] = $question;
549 }
550 }
551
552 return $questions;
553 }
554
f3701561 555 /**
556 * return an "empty" question
557 * Somewhere to specify question parameters that are not handled
558 * by import but are required db fields.
559 * This should not be overridden.
560 * @return object default question
271e6dec 561 */
aca318e1 562 function defaultquestion() {
b0679efa 563 global $CFG;
0cd46577 564 static $defaultshuffleanswers = null;
565 if (is_null($defaultshuffleanswers)) {
566 $defaultshuffleanswers = get_config('quiz', 'shuffleanswers');
567 }
271e6dec 568
aca318e1 569 $question = new stdClass();
0cd46577 570 $question->shuffleanswers = $defaultshuffleanswers;
49e2bba7 571 $question->defaultmark = 1;
aca318e1 572 $question->image = "";
573 $question->usecase = 0;
574 $question->multiplier = array();
172f6d95 575 $question->generalfeedback = '';
08892d5b 576 $question->correctfeedback = '';
577 $question->partiallycorrectfeedback = '';
578 $question->incorrectfeedback = '';
5931ea94 579 $question->answernumbering = 'abc';
49e2bba7 580 $question->penalty = 0.3333333;
3f5633df 581 $question->length = 1;
aca318e1 582
5fd8f999 583 // this option in case the questiontypes class wants
584 // to know where the data came from
585 $question->export_process = true;
093414d2 586 $question->import_process = true;
5fd8f999 587
aca318e1 588 return $question;
589 }
590
f3701561 591 /**
271e6dec 592 * Given the data known to define a question in
593 * this format, this function converts it into a question
f3701561 594 * object suitable for processing and insertion into Moodle.
595 *
596 * If your format does not use blank lines to delimit questions
597 * (e.g. an XML format) you must override 'readquestions' too
598 * @param $lines mixed data that represents question
599 * @return object question object
600 */
aca318e1 601 function readquestion($lines) {
aca318e1 602
5e8a85aa 603 $formatnotimplemented = get_string('formatnotimplemented', 'question');
1e3d6fd8 604 echo "<p>$formatnotimplemented</p>";
aca318e1 605
606 return NULL;
607 }
608
f3701561 609 /**
610 * Override if any post-processing is required
f7970e3c 611 * @return bool success
f3701561 612 */
aca318e1 613 function importpostprocess() {
aca318e1 614 return true;
615 }
616
3f5633df 617
f3701561 618/*******************
619 * EXPORT FUNCTIONS
620 *******************/
aca318e1 621
271e6dec 622 /**
a41e3287 623 * Provide export functionality for plugin questiontypes
624 * Do not override
625 * @param name questiontype name
271e6dec 626 * @param question object data to export
a41e3287 627 * @param extra mixed any addition format specific data needed
628 * @return string the data to append to export or false if error (or unhandled)
629 */
13bb604e 630 function try_exporting_using_qtypes($name, $question, $extra=null) {
a41e3287 631 // work out the name of format in use
13bb604e 632 $formatname = substr(get_class($this), strlen('qformat_'));
a41e3287 633 $methodname = "export_to_$formatname";
634
d649fb02
TH
635 $qtype = question_bank::get_qtype($name, false);
636 if (method_exists($qtype, $methodname)) {
637 return $qtype->$methodname($question, $this, $extra);
a41e3287 638 }
639 return false;
640 }
641
f3701561 642 /**
643 * Do any pre-processing that may be required
f7970e3c 644 * @param bool success
f3701561 645 */
08892d5b 646 function exportpreprocess() {
aca318e1 647 return true;
648 }
649
f3701561 650 /**
651 * Enable any processing to be done on the content
652 * just prior to the file being saved
653 * default is to do nothing
654 * @param string output text
655 * @param string processed output text
656 */
13bb604e 657 function presave_process($content) {
aca318e1 658 return $content;
659 }
660
f3701561 661 /**
662 * Do the export
663 * For most types this should not need to be overrided
cde2709a 664 * @return stored_file
f3701561 665 */
08892d5b 666 function exportprocess() {
cde2709a 667 global $CFG, $OUTPUT, $DB, $USER;
aca318e1 668
669 // get the questions (from database) in this category
670 // only get q's with no parents (no cloze subquestions specifically)
cde2709a 671 if ($this->category) {
13bb604e 672 $questions = get_questions_category($this->category, true);
2c44a3d3 673 } else {
674 $questions = $this->questions;
675 }
aca318e1 676
aca318e1 677 $count = 0;
678
679 // results are first written into string (and then to a file)
680 // so create/initialize the string here
681 $expout = "";
271e6dec 682
f1abd39f 683 // track which category questions are in
684 // if it changes we will record the category change in the output
685 // file if selected. 0 means that it will get printed before the 1st question
686 $trackcategory = 0;
aca318e1 687
688 // iterate through questions
689 foreach($questions as $question) {
cde2709a
DC
690 // used by file api
691 $contextid = $DB->get_field('question_categories', 'contextid', array('id'=>$question->category));
692 $question->contextid = $contextid;
271e6dec 693
a9b16aff 694 // do not export hidden questions
695 if (!empty($question->hidden)) {
696 continue;
697 }
698
699 // do not export random questions
700 if ($question->qtype==RANDOM) {
701 continue;
702 }
271e6dec 703
f1abd39f 704 // check if we need to record category change
705 if ($this->cattofile) {
706 if ($question->category != $trackcategory) {
271e6dec 707 $trackcategory = $question->category;
728d60a1 708 $categoryname = $this->get_category_path($trackcategory, $this->contexttofile);
271e6dec 709
f1abd39f 710 // create 'dummy' question for category export
7f389342 711 $dummyquestion = new stdClass();
f1abd39f 712 $dummyquestion->qtype = 'category';
713 $dummyquestion->category = $categoryname;
728d60a1 714 $dummyquestion->name = 'Switch category to ' . $categoryname;
f1abd39f 715 $dummyquestion->id = 0;
716 $dummyquestion->questiontextformat = '';
cde2709a 717 $dummyquestion->contextid = 0;
728d60a1 718 $expout .= $this->writequestion($dummyquestion) . "\n";
271e6dec 719 }
720 }
f1abd39f 721
722 // export the question displaying message
723 $count++;
cde2709a 724
cde2709a 725 if (question_has_capability_on($question, 'view', $question->category)) {
cde2709a 726 $expout .= $this->writequestion($question, $contextid) . "\n";
0647e82b 727 }
a9b16aff 728 }
aca318e1 729
2c6d2c88 730 // continue path for following error checks
731 $course = $this->course;
2c44a3d3 732 $continuepath = "$CFG->wwwroot/question/export.php?courseid=$course->id";
2c6d2c88 733
734 // did we actually process anything
735 if ($count==0) {
5e8a85aa 736 print_error('noquestions', 'question', $continuepath);
2c6d2c88 737 }
738
aca318e1 739 // final pre-process on exported data
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740 $expout = $this->presave_process($expout);
741 return $expout;
aca318e1 742 }
3f5633df 743
271e6dec 744 /**
745 * get the category as a path (e.g., tom/dick/harry)
746 * @param int id the id of the most nested catgory
271e6dec 747 * @return string the path
748 */
728d60a1 749 function get_category_path($id, $includecontext = true) {
f34488b2 750 global $DB;
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751
752 if (!$category = $DB->get_record('question_categories',array('id' =>$id))) {
1e7386c9 753 print_error('cannotfindcategory', 'error', '', $id);
271e6dec 754 }
271e6dec 755 $contextstring = $this->translator->context_to_string($category->contextid);
728d60a1
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756
757 $pathsections = array();
271e6dec 758 do {
728d60a1 759 $pathsections[] = $category->name;
271e6dec 760 $id = $category->parent;
13bb604e 761 } while ($category = $DB->get_record('question_categories', array('id' => $id)));
271e6dec 762
13bb604e 763 if ($includecontext) {
728d60a1 764 $pathsections[] = '$' . $contextstring . '$';
271e6dec 765 }
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766
767 $path = $this->assemble_category_path(array_reverse($pathsections));
768
271e6dec 769 return $path;
770 }
aca318e1 771
728d60a1
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772 /**
773 * Convert a list of category names, possibly preceeded by one of the
774 * context tokens like $course$, into a string representation of the
775 * category path.
776 *
777 * Names are separated by / delimiters. And /s in the name are replaced by //.
778 *
779 * To reverse the process and split the paths into names, use
780 * {@link split_category_path()}.
781 *
782 * @param array $names
783 * @return string
784 */
785 protected function assemble_category_path($names) {
786 $escapednames = array();
787 foreach ($names as $name) {
788 $escapedname = str_replace('/', '//', $name);
789 if (substr($escapedname, 0, 1) == '/') {
790 $escapedname = ' ' . $escapedname;
791 }
792 if (substr($escapedname, -1) == '/') {
793 $escapedname = $escapedname . ' ';
794 }
795 $escapednames[] = $escapedname;
796 }
797 return implode('/', $escapednames);
798 }
799
800 /**
801 * Convert a string, as returned by {@link assemble_category_path()},
802 * back into an array of category names.
803 *
804 * Each category name is cleaned by a call to clean_param(, PARAM_MULTILANG),
aab03169 805 * which matches the cleaning in question/category_form.php.
728d60a1
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806 *
807 * @param string $path
808 * @return array of category names.
809 */
810 protected function split_category_path($path) {
811 $rawnames = preg_split('~(?<!/)/(?!/)~', $path);
812 $names = array();
813 foreach ($rawnames as $rawname) {
814 $names[] = clean_param(trim(str_replace('//', '/', $rawname)), PARAM_MULTILANG);
815 }
816 return $names;
817 }
818
f3701561 819 /**
820 * Do an post-processing that may be required
f7970e3c 821 * @return bool success
f3701561 822 */
aca318e1 823 function exportpostprocess() {
aca318e1 824 return true;
825 }
826
f3701561 827 /**
828 * convert a single question object into text output in the given
829 * format.
830 * This must be overriden
831 * @param object question question object
832 * @return mixed question export text or null if not implemented
833 */
aca318e1 834 function writequestion($question) {
1e3d6fd8 835 // if not overidden, then this is an error.
5e8a85aa 836 $formatnotimplemented = get_string('formatnotimplemented', 'question');
1e3d6fd8 837 echo "<p>$formatnotimplemented</p>";
aca318e1 838 return NULL;
839 }
840
f3701561 841 /**
13bb604e
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842 * Convert the question text to plain text, so it can safely be displayed
843 * during import to let the user see roughly what is going on.
f3701561 844 */
5b0dc681 845 function format_question_text($question) {
fe6ce234 846 global $DB;
0ff4bd08 847 $formatoptions = new stdClass();
5b0dc681 848 $formatoptions->noclean = true;
22cebed5 849 return html_to_text(format_text($question->questiontext,
c73c9836 850 $question->questiontextformat, $formatoptions), 0, false);
5b0dc681 851 }
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852
853 /**
854 * convert files into text output in the given format.
855 * @param array
856 * @param string encoding method
857 * @return string $string
858 */
859 function writefiles($files, $encoding='base64') {
860 if (empty($files)) {
861 return '';
862 }
863 $string = '';
864 foreach ($files as $file) {
865 if ($file->is_directory()) {
866 continue;
867 }
06f1bd03 868 $string .= '<file name="' . $file->get_filename() . '" encoding="' . $encoding . '">';
cde2709a 869 $string .= base64_encode($file->get_content());
cde2709a
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870 $string .= '</file>';
871 }
872 return $string;
873 }
aca318e1 874}