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questiontype.php
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questiontype.php
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<?php // $Id$
///////////////////
/// SHORTANSWER ///
///////////////////
/// QUESTION TYPE CLASS //////////////////
///
/// This class contains some special features in order to make the
/// question type embeddable within a multianswer (cloze) question
///
require_once("$CFG->dirroot/question/type/questiontype.php");
class question_shortanswer_qtype extends default_questiontype {
function name() {
return 'shortanswer';
}
function get_question_options(&$question) {
// Get additional information from database
// and attach it to the question object
if (!$question->options = get_record('question_shortanswer', 'question', $question->id)) {
notify('Error: Missing question options!');
return false;
}
if (!$question->options->answers = get_records('question_answers', 'question',
$question->id, 'id ASC')) {
notify('Error: Missing question answers!');
return false;
}
return true;
}
function save_question_options($question) {
$result = new stdClass;
if (!$oldanswers = get_records('question_answers', 'question', $question->id, 'id ASC')) {
$oldanswers = array();
}
$answers = array();
$maxfraction = -1;
// Insert all the new answers
foreach ($question->answer as $key => $dataanswer) {
if ($dataanswer != "") {
if ($oldanswer = array_shift($oldanswers)) { // Existing answer, so reuse it
$answer = $oldanswer;
$answer->answer = trim($dataanswer);
$answer->fraction = $question->fraction[$key];
$answer->feedback = $question->feedback[$key];
if (!update_record("question_answers", $answer)) {
$result->error = "Could not update quiz answer! (id=$answer->id)";
return $result;
}
} else { // This is a completely new answer
$answer = new stdClass;
$answer->answer = trim($dataanswer);
$answer->question = $question->id;
$answer->fraction = $question->fraction[$key];
$answer->feedback = $question->feedback[$key];
if (!$answer->id = insert_record("question_answers", $answer)) {
$result->error = "Could not insert quiz answer!";
return $result;
}
}
$answers[] = $answer->id;
if ($question->fraction[$key] > $maxfraction) {
$maxfraction = $question->fraction[$key];
}
}
}
if ($options = get_record("question_shortanswer", "question", $question->id)) {
$options->answers = implode(",",$answers);
$options->usecase = $question->usecase;
if (!update_record("question_shortanswer", $options)) {
$result->error = "Could not update quiz shortanswer options! (id=$options->id)";
return $result;
}
} else {
unset($options);
$options->question = $question->id;
$options->answers = implode(",",$answers);
$options->usecase = $question->usecase;
if (!insert_record("question_shortanswer", $options)) {
$result->error = "Could not insert quiz shortanswer options!";
return $result;
}
}
// delete old answer records
if (!empty($oldanswers)) {
foreach($oldanswers as $oa) {
delete_records('question_answers', 'id', $oa->id);
}
}
/// Perform sanity checks on fractional grades
if ($maxfraction != 1) {
$maxfraction = $maxfraction * 100;
$result->noticeyesno = get_string("fractionsnomax", "quiz", $maxfraction);
return $result;
} else {
return true;
}
}
/**
* Deletes question from the question-type specific tables
*
* @return boolean Success/Failure
* @param object $question The question being deleted
*/
function delete_question($questionid) {
delete_records("question_shortanswer", "question", $questionid);
return true;
}
function print_question_formulation_and_controls(&$question, &$state, $cmoptions, $options) {
global $CFG;
/// This implementation is also used by question type 'numerical'
$correctanswers = $this->get_correct_responses($question, $state);
$readonly = empty($options->readonly) ? '' : 'readonly="readonly"';
$formatoptions = new stdClass;
$formatoptions->noclean = true;
$formatoptions->para = false;
$nameprefix = $question->name_prefix;
/// Print question text and media
$questiontext = format_text($question->questiontext,
$question->questiontextformat,
$formatoptions, $cmoptions->course);
$image = get_question_image($question, $cmoptions->course);
/// Print input controls
if (isset($state->responses[''])) {
$value = ' value="'.s($state->responses[''], true).'" ';
} else {
$value = ' value="" ';
}
$inputname = ' name="'.$nameprefix.'" ';
$feedback = '';
if ($options->feedback) {
foreach($question->options->answers as $answer) {
if($this->test_response($question, $state, $answer)) {
if ($answer->feedback) {
$feedback = format_text($answer->feedback, true, $formatoptions, $cmoptions->course);
}
break;
}
}
}
$correctanswer = '';
if ($options->readonly && $options->correct_responses) {
$delimiter = '';
if ($correctanswers) {
foreach ($correctanswers as $ca) {
$correctanswer .= $delimiter.$ca;
$delimiter = ', ';
}
}
}
include("$CFG->dirroot/question/type/shortanswer/display.html");
}
// ULPGC ecastro
function check_response(&$question, &$state) {
$answers = &$question->options->answers;
$testedstate = clone($state);
$teststate = clone($state);
foreach($answers as $aid => $answer) {
$teststate->responses[''] = trim($answer->answer);
if($this->compare_responses($question, $testedstate, $teststate)) {
return $aid;
}
}
return false;
}
function compare_responses($question, $state, $teststate) {
if (isset($state->responses['']) && isset($teststate->responses[''])) {
if ($question->options->usecase) {
return strcmp($state->responses[''], $teststate->responses['']) == 0;
} else {
return strcasecmp($state->responses[''], $teststate->responses['']) == 0;
}
}
return false;
}
function test_response(&$question, $state, $answer) {
return $this->compare_string_with_wildcard(stripslashes_safe($state->responses['']),
$answer->answer, !$question->options->usecase);
}
function compare_string_with_wildcard($string, $pattern, $ignorecase) {
// Break the string on non-escaped asterisks.
$bits = preg_split('/(?<!\\\\)\*/', $pattern);
// Escape regexp special characters in the bits.
$bits = array_map('preg_quote', $bits);
// Put it back together to make the regexp.
$regexp = '|^' . implode('.*', $bits) . '$|u';
// Make the match insensitive if requested to.
if ($ignorecase) {
$regexp .= 'i';
}
return preg_match($regexp, trim($string));
}
/// BACKUP FUNCTIONS ////////////////////////////
/*
* Backup the data in the question
*
* This is used in question/backuplib.php
*/
function backup($bf,$preferences,$question,$level=6) {
$status = true;
$shortanswers = get_records('question_shortanswer', 'question', $question, 'id ASC');
//If there are shortanswers
if ($shortanswers) {
//Iterate over each shortanswer
foreach ($shortanswers as $shortanswer) {
$status = fwrite ($bf,start_tag("SHORTANSWER",$level,true));
//Print shortanswer contents
fwrite ($bf,full_tag("ANSWERS",$level+1,false,$shortanswer->answers));
fwrite ($bf,full_tag("USECASE",$level+1,false,$shortanswer->usecase));
$status = fwrite ($bf,end_tag("SHORTANSWER",$level,true));
}
//Now print question_answers
$status = question_backup_answers($bf,$preferences,$question);
}
return $status;
}
/// RESTORE FUNCTIONS /////////////////
/*
* Restores the data in the question
*
* This is used in question/restorelib.php
*/
function restore($old_question_id,$new_question_id,$info,$restore) {
$status = true;
//Get the shortanswers array
$shortanswers = $info['#']['SHORTANSWER'];
//Iterate over shortanswers
for($i = 0; $i < sizeof($shortanswers); $i++) {
$sho_info = $shortanswers[$i];
//Now, build the question_shortanswer record structure
$shortanswer = new stdClass;
$shortanswer->question = $new_question_id;
$shortanswer->answers = backup_todb($sho_info['#']['ANSWERS']['0']['#']);
$shortanswer->usecase = backup_todb($sho_info['#']['USECASE']['0']['#']);
//We have to recode the answers field (a list of answers id)
//Extracts answer id from sequence
$answers_field = "";
$in_first = true;
$tok = strtok($shortanswer->answers,",");
while ($tok) {
//Get the answer from backup_ids
$answer = backup_getid($restore->backup_unique_code,"question_answers",$tok);
if ($answer) {
if ($in_first) {
$answers_field .= $answer->new_id;
$in_first = false;
} else {
$answers_field .= ",".$answer->new_id;
}
}
//check for next
$tok = strtok(",");
}
//We have the answers field recoded to its new ids
$shortanswer->answers = $answers_field;
//The structure is equal to the db, so insert the question_shortanswer
$newid = insert_record ("question_shortanswer",$shortanswer);
//Do some output
if (($i+1) % 50 == 0) {
if (!defined('RESTORE_SILENTLY')) {
echo ".";
if (($i+1) % 1000 == 0) {
echo "<br />";
}
}
backup_flush(300);
}
if (!$newid) {
$status = false;
}
}
return $status;
}
}
//// END OF CLASS ////
//////////////////////////////////////////////////////////////////////////
//// INITIATION - Without this line the question type is not in use... ///
//////////////////////////////////////////////////////////////////////////
question_register_questiontype(new question_shortanswer_qtype());
?>