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<?PHP // $Id: questiontype.php,v 1.3 2004/07/30 14:43:08 kaipe Exp $
/////////////////
/// NUMERICAL ///
/////////////////
/// QUESTION TYPE CLASS //////////////////
///
/// This class contains some special features in order to make the
/// question type embeddable within a multianswer (cloze) question
///
/// This question type behaves like shortanswer in most cases.
/// Therefore, it extends the shortanswer question type...
require_once("$CFG->dirroot/mod/quiz/questiontypes/shortanswer/questiontype.php");
class quiz_numerical_qtype extends quiz_shortanswer_qtype {
function get_answers($question, $addedcondition='') {
// The added condition is one addition that has been added
// to the behaviour of this question type in order to make
// it embeddable within a multianswer (embedded cloze) question
global $CFG;
// There can be multiple answers
return get_records_sql("SELECT a.*, n.min, n.max
FROM {$CFG->prefix}quiz_numerical n,
{$CFG->prefix}quiz_answers a
WHERE a.question = '$question->id'
AND n.answer = a.id "
. $addedcondition);
}
function name() {
return 'numerical';
}
function save_question_options($question) {
if (!$oldanswers = get_records("quiz_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 = $dataanswer;
$answer->fraction = $question->fraction[$key];
$answer->feedback = $question->feedback[$key];
if (!update_record("quiz_answers", $answer)) {
$result->error = "Could not update quiz answer! (id=$answer->id)";
return $result;
}
} else { // This is a completely new answer
unset($answer);
$answer->answer = $dataanswer;
$answer->question = $question->id;
$answer->fraction = $question->fraction[$key];
$answer->feedback = $question->feedback[$key];
if (!$answer->id = insert_record("quiz_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("quiz_numerical", "answer", $answer->id)) {
$options->min= $question->min[$key];
$options->max= $question->max[$key];
if (!update_record("quiz_numerical", $options)) {
$result->error = "Could not update quiz numerical options! (id=$options->id)";
return $result;
}
} else { // completely new answer
unset($options);
$options->question = $question->id;
$options->answer = $answer->id;
$options->min = $question->min[$key];
$options->max = $question->max[$key];
if (!insert_record("quiz_numerical", $options)) {
$result->error = "Could not insert quiz numerical options!";
return $result;
}
}
}
}
/// Save units
/// Make unit records
$newunits = array();
unset($tmpunit);
$tmpunit->question = $question->id;
foreach ($question->multiplier as $key => $multiplier) {
if ($multiplier && is_numeric($multiplier)) {
$tmpunit->multiplier = $multiplier;
$tmpunit->unit = trim($question->unit[$key]);
$newunits[] = $tmpunit;
}
}
if (1 == count($newunits) && !$newunits[0]->unit) {
/// Only default unit and it is empty, so drop it:
$newunits = array();
}
if ($oldunits = get_records('quiz_numerical_units',
'question', $question->id)) {
foreach ($oldunits as $unit) {
if ($newunit = array_shift($newunits)) {
$unit->multiplier = $newunit->multiplier;
$unit->unit = $newunit->unit;
if (!update_record('quiz_numerical_units', $unit)) {
$result->error = "Could not update quiz_numerical_unit $unit->unit";
return $result;
}
} else {
delete_records('quiz_numerical_units', 'id', $unit->id);
}
}
}
foreach ($newunits as $newunit) {
// Create new records for the remaining units:
if (!insert_record('quiz_numerical_units', $newunit)) {
$result->error = "Unable to insert new unit $newunit->unit";
return $result;
}
}
/// Perform sanity checks on fractional grades
if ($maxfraction != 1) {
$maxfraction = $maxfraction * 100;
$result->noticeyesno = get_string("fractionsnomax", "quiz", $maxfraction);
return $result;
} else {
return true;
}
}
function grade_response($question, $nameprefix, $addedanswercondition='') {
$result->answers = array();
$units = get_records('quiz_numerical_units',
'question', $question->id);
if (isset($question->response[$nameprefix])) {
$response = trim(stripslashes($question->response[$nameprefix]));
// Arrays with 'wild cards':
$search = array(' ',',');
$replace = array('','.');
$responsenum = str_replace($search, $replace, $response);
if (empty($units)) {
if ('' !== $responsenum && is_numeric($responsenum)) {
$responsenum = (float)$responsenum;
} else {
unset($responsenum); // Answer is not numeric
}
} else if (ereg(
'^(([0-9]+(\\.[0-9]*)?|[.][0-9]+)([eE][-+]?[0-9]+)?)([^0-9].*)?$',
$responsenum, $responseparts)) {
$responsenum = (float)$responseparts[1];
if ($responseparts[5]) {
$responseunit = $responseparts[5];
} else {
$responseunit = '';
}
$unitidentified = false;
foreach ($units as $unit) {
if (str_replace($search, $replace, $unit->unit)
== $responseunit) {
$unitidentified = true;
$responsenum /= $unit->multiplier;
break;
}
}
if (!$unitidentified) {
unset($responsenum); // No unit OK
}
} else {
unset($responsenum); // Answer is not numeric
}
} else {
$response = '';
}
$answers = $this->get_answers($question, $addedanswercondition);
foreach ($answers as $answer) {
/// Check if response matches answer...
if ('' !== $response and empty($result->answers)
|| $answer->fraction
> $result->answers[$nameprefix]->fraction
and strtolower($response) == strtolower($answer->answer)
|| '' != trim($answer->min) && isset($responsenum)
&& $responsenum >= (float)$answer->min
&& $responsenum <= (float)$answer->max) {
$result->answers[$nameprefix] = $answer;
}
}
$result->grade = isset($result->answers[$nameprefix])
? $result->answers[$nameprefix]->fraction
: 0.0;
$result->correctanswers = quiz_extract_correctanswers($answers,
$nameprefix);
/////////////////////////////////////////////////
// For numerical answer we have the policy to
// set feedback for any response, even if the
// response does not entitle the student to it.
/////////////////////////////////////////////////
if ('' !== $response and empty($result->answers)
|| empty($result->answers[$nameprefix]->feedback)) {
// Look for just any feedback:
foreach ($result->correctanswers as $correctanswer) {
if ($correctanswer->feedback) {
$result->answers[$nameprefix]->feedback =
$correctanswer->feedback;
if (empty($result->answers[$nameprefix]->id)) {
// Better fake an answer as well:
$result->answers[$nameprefix]->id = 0;
$result->answers[$nameprefix]->answer = $response;
$result->answers[$nameprefix]->fraction = 0.0;
$result->answers[$nameprefix]->question = $question->id;
}
break;
}
}
}
return $result;
}
}
//// END OF CLASS ////
//////////////////////////////////////////////////////////////////////////
//// INITIATION - Without this line the question type is not in use... ///
//////////////////////////////////////////////////////////////////////////
$QUIZ_QTYPES[NUMERICAL]= new quiz_numerical_qtype();
?>
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