fix for 5205
[moodle.git] / question / format.php
CommitLineData
aca318e1 1<?php // $Id$
2
3////////////////////////////////////////////////////////////////////
4/// format.php - Default format class for file imports/exports. //
5/// //
6/// Doesn't do everything on it's own -- it needs to be extended. //
7////////////////////////////////////////////////////////////////////
8
9// Included by import.php and export.php
10
f5565b69 11class qformat_default {
aca318e1 12
13 var $displayerrors = true;
14 var $category = NULL;
15 var $course = NULL;
16 var $questionids = array();
17
18// functions to indicate import/export functionality
19// override to return true if implemented
20
21 function provide_import() {
22 return false;
23 }
24
25 function provide_export() {
26 return false;
27 }
28
29/// Importing functions
30
31 function importpreprocess($category, $course=NULL ) {
32 /// Does any pre-processing that may be desired
33
34 $this->category = $category; // Important
35 $this->course = $course;
36
37 return true;
38 }
39
76f0a334 40 /**
41 *
42 * @PARAM $matchgrades string 'error' or 'nearest', mismatched grades handling
43 */
44 function importprocess($filename, $matchgrades='error') {
aca318e1 45 /// Processes a given file. There's probably little need to change this
46
47 if (! $lines = $this->readdata($filename)) {
1e3d6fd8 48 notify( get_string('cannotread','quiz') );
aca318e1 49 return false;
50 }
51
52 if (! $questions = $this->readquestions($lines)) { // Extract all the questions
1e3d6fd8 53 notify( get_string('noquestionsinfile','quiz') );
aca318e1 54 return false;
55 }
56
1e3d6fd8 57 notify( get_string('importingquestions','quiz',count($questions)) );
aca318e1 58
76f0a334 59 // get list of valid answer grades
60 $grades = get_grade_options();
61 $gradeoptionsfull = $grades->gradeoptionsfull;
62
aca318e1 63 $count = 0;
64
65 foreach ($questions as $question) { // Process and store each question
66 $count++;
67
68 echo "<hr /><p><b>$count</b>. ".stripslashes($question->questiontext)."</p>";
69
76f0a334 70 // check for answer grades validity (must match fixed list of grades)
71 $fractions = $question->fraction;
2d52056f 72 if (!empty($fractions)) {
73 $answersvalid = true; // in case they are!
74 foreach ($fractions as $key => $fraction) {
75 $newfraction = match_grade_options($gradeoptionsfull, $fraction, $matchgrades);
76 if ($newfraction===false) {
77 $answersvalid = false;
78 }
79 else {
80 $fractions[$key] = $newfraction;
81 }
82 }
83 if (!$answersvalid) {
84 notify( get_string('matcherror','quiz') );
85 continue;
76f0a334 86 }
87 else {
2d52056f 88 $question->fraction = $fractions;
76f0a334 89 }
90 }
76f0a334 91
aca318e1 92 $question->category = $this->category->id;
93 $question->stamp = make_unique_id_code(); // Set the unique code (not to be changed)
aca318e1 94
062f1125 95 if (!$question->id = insert_record("question", $question)) {
1e3d6fd8 96 error( get_string('cannotinsert','quiz') );
aca318e1 97 }
98
99 $this->questionids[] = $question->id;
100
101 // Now to save all the answers and type-specific options
102
103 global $QTYPES;
104 $result = $QTYPES[$question->qtype]
105 ->save_question_options($question);
106
107 if (!empty($result->error)) {
108 notify($result->error);
109 return false;
110 }
111
112 if (!empty($result->notice)) {
113 notify($result->notice);
114 return true;
115 }
cbe20043 116
117 // Give the question a unique version stamp determined by question_hash()
118 set_field('question', 'version', question_hash($question), 'id', $question->id);
aca318e1 119 }
120 return true;
121 }
122
123
124 function readdata($filename) {
125 /// Returns complete file with an array, one item per line
126
127 if (is_readable($filename)) {
128 $filearray = file($filename);
129
130 /// Check for Macintosh OS line returns (ie file on one line), and fix
131 if (ereg("\r", $filearray[0]) AND !ereg("\n", $filearray[0])) {
132 return explode("\r", $filearray[0]);
133 } else {
134 return $filearray;
135 }
136 }
137 return false;
138 }
139
140 function readquestions($lines) {
141 /// Parses an array of lines into an array of questions,
142 /// where each item is a question object as defined by
143 /// readquestion(). Questions are defined as anything
144 /// between blank lines.
145
146 $questions = array();
147 $currentquestion = array();
148
149 foreach ($lines as $line) {
150 $line = trim($line);
151 if (empty($line)) {
152 if (!empty($currentquestion)) {
153 if ($question = $this->readquestion($currentquestion)) {
154 $questions[] = $question;
155 }
156 $currentquestion = array();
157 }
158 } else {
159 $currentquestion[] = $line;
160 }
161 }
162
163 if (!empty($currentquestion)) { // There may be a final question
164 if ($question = $this->readquestion($currentquestion)) {
165 $questions[] = $question;
166 }
167 }
168
169 return $questions;
170 }
171
172
173 function defaultquestion() {
174 // returns an "empty" question
175 // Somewhere to specify question parameters that are not handled
176 // by import but are required db fields.
177 // This should not be overridden.
178 $question = new stdClass();
179 $question->shuffleanswers = 0;
180 $question->defaultgrade = 1;
181 $question->image = "";
182 $question->usecase = 0;
183 $question->multiplier = array();
184
185 return $question;
186 }
187
188 function readquestion($lines) {
189 /// Given an array of lines known to define a question in
190 /// this format, this function converts it into a question
191 /// object suitable for processing and insertion into Moodle.
192
1e3d6fd8 193 $formatnotimplemented = get_string( 'formatnotimplemented','quiz' );
194 echo "<p>$formatnotimplemented</p>";
aca318e1 195
196 return NULL;
197 }
198
199
200 function importpostprocess() {
201 /// Does any post-processing that may be desired
202 /// Argument is a simple array of question ids that
203 /// have just been added.
204
205 return true;
206 }
207
208// Export functions
209
210
211 function export_file_extension() {
212 /// return the files extension appropriate for this type
213 /// override if you don't want .txt
214
215 return ".txt";
216 }
217
218 function exportpreprocess($category, $course) {
219 /// Does any pre-processing that may be desired
220
221 $this->category = $category; // Important
222 $this->course = $course; // As is this!
223
224 return true;
225 }
226
227 function presave_process( $content ) {
228 /// enables any processing to be done on the content
229 /// just prior to the file being saved
230 /// default is to do nothing
231
232 return $content;
233 }
234
235 function exportprocess($filename) {
236 /// Exports a given category. There's probably little need to change this
237
238 global $CFG;
239
240 // create a directory for the exports (if not already existing)
241 $dirname = get_string("exportfilename","quiz");
242 $courseid = $this->course->id;
243 $path = $CFG->dataroot.'/'.$courseid.'/'.$dirname;
244 if (!is_dir($path)) {
245 if (!mkdir($path, $CFG->directorypermissions)) {
1e3d6fd8 246 error( get_string('cannotcreatepath','quiz',$path) );
aca318e1 247 }
248 }
249
250 // get the questions (from database) in this category
251 // only get q's with no parents (no cloze subquestions specifically)
252 $questions = get_questions_category( $this->category, true );
253
1e3d6fd8 254 notify( get_string('exportingquestions','quiz') );
aca318e1 255 if (!count($questions)) {
1e3d6fd8 256 notify( get_string('noquestions','quiz') );
257 return false;
aca318e1 258 }
259 $count = 0;
260
261 // results are first written into string (and then to a file)
262 // so create/initialize the string here
263 $expout = "";
264
265 // iterate through questions
266 foreach($questions as $question) {
267 $count++;
268 $qtype = $question->qtype;
269 // ignore random questiond
270 if ($qtype!=RANDOM) {
271 echo "<hr /><p><b>$count</b>. ".stripslashes($question->questiontext)."</p>";
272 $expout .= $this->writequestion( $question ) . "\n";
273 }
274 }
275
276 // final pre-process on exported data
277 $expout = $this->presave_process( $expout );
278
279 // write file
280 $filepath = $path."/".$filename . $this->export_file_extension();
281 if (!$fh=fopen($filepath,"w")) {
1e3d6fd8 282 error( get_string('cannotopen','quiz',$filepath) );
aca318e1 283 }
284 if (!fwrite($fh, $expout)) {
1e3d6fd8 285 error( get_string('cannotwrite','quiz',$filepath) );
aca318e1 286 }
287 fclose($fh);
288
289 return true;
290 }
291
292 function exportpostprocess() {
293 /// Does any post-processing that may be desired
294
295 return true;
296 }
297
298 function writequestion($question) {
299 /// Turns a question object into textual output in the given format
300 /// must be overidden
301
1e3d6fd8 302 // if not overidden, then this is an error.
303 $formatnotimplemented = get_string( 'formatnotimplemented','quiz' );
304 echo "<p>$formatnotimplemented</p>";
aca318e1 305
306 return NULL;
307 }
308
309}
310
311?>