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<?php
/**
* Class CompositeEvaluator
*
* Date: 07.01.14
* Time: 13:27
* @author Thomas Joußen <tjoussen@databay.de>
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*/
class CompositeEvaluator
{
/**
* @var ilParserQuestionProvider
*/
protected $object_loader;
/**
* @var ilFormATestSession
*/
protected $session;
/**
* @param ilParserQuestionProvider $object_loader
* @param ilFormATestSession $session
*/
public function __construct($object_loader, $session)
{
$this->object_loader = $object_loader;
$this->session = $session;
}
/**
* @param AbstractComposite $composite
*
* @return bool
*/
public function evaluate(AbstractComposite $composite)
{
if (is_array($composite->nodes) && count($composite->nodes) > 0) {
$composite->nodes[0] = $this->evaluate($composite->nodes[0]);
$composite->nodes[1] = $this->evaluate($composite->nodes[1]);
$composite = $this->evaluateSubTree($composite);
}
return $composite;
}
/**
* @param AbstractComposite $composite
*
* @return bool
*/
private function evaluateSubTree(AbstractComposite $composite)
{
$result = false;
if ($composite->nodes[0] instanceof ExpressionInterface &&
$composite->nodes[1] instanceof ExpressionInterface
) {
$question = $this->object_loader->getQuestion($composite->nodes[0]->getQuestionIndex());
$rightNode = $composite->nodes[1];
$index = ($composite->nodes[0] instanceof ResultOfAnswerOfQuestionExpression)? $composite->nodes[0]->getAnswerIndex(): null;
$solutions = $question->getUserQuestionResult($this->session->getActiveId(), $this->session->getPass());
if ($question instanceof assClozeTest) {
// @todo for Thomas J.: Move to interface / implement in concrete class (req. for future releases)
/**
* @var $gap assClozeGap
* @var $answer assAnswerCloze
*/
$result = $solutions->getSolutionForKey($index);
$gap = $question->getAvailableAnswerOptions($index - 1);
if ($rightNode instanceof StringResultExpression) {
if ($gap->getType() == 1) {
$answer = $gap->getItem($result['value'] - 1);
$solutions->removeByKey($index);
$solutions->addKeyValue($index, $answer->getAnswertext());
}
} elseif (
$rightNode instanceof PercentageResultExpression &&
$composite->nodes[0] instanceof ResultOfAnswerOfQuestionExpression) {
/**
* @var $answers assAnswerCloze[]
*/
$answers = $gap->getItems(new ilArrayElementShuffler());
$max_points = 0;
foreach ($answers as $answer) {
if ($max_points < $answer->getPoints()) {
$max_points = $answer->getPoints();
}
}
$item = null;
$reached_points = null;
// @todo for Thomas J.: Maybe handle identical scoring for every type
switch ($gap->getType()) {
case CLOZE_TEXT:
for ($order = 0; $order < $gap->getItemCount(); $order++) {
$answer = $gap->getItem($order);
$item_points = $question->getTextgapPoints($answer->getAnswertext(), $result['value'], $answer->getPoints());
if ($item_points > $reached_points) {
$reached_points = $item_points;
}
}
break;
case CLOZE_NUMERIC:
for ($order = 0; $order < $gap->getItemCount(); $order++) {
$answer = $gap->getItem($order);
$item_points = $question->getNumericgapPoints($answer->getAnswertext(), $result["value"], $answer->getPoints(), $answer->getLowerBound(), $answer->getUpperBound());
if ($item_points > $reached_points) {
$reached_points = $item_points;
}
}
break;
case CLOZE_SELECT:
if ($result['value'] != null) {
$answer = $gap->getItem($result['value'] - 1);
$reached_points = $answer->getPoints();
}
break;
}
$percentage = 0;
if ($max_points != 0 && $reached_points !== null) {
$percentage = (int) (($reached_points / $max_points) * 100);
}
$solutions->setReachedPercentage($percentage);
}
}
if (
$question instanceof assFormulaQuestion &&
$rightNode instanceof PercentageResultExpression &&
$composite->nodes[0] instanceof ResultOfAnswerOfQuestionExpression
) {
// @todo for Thomas J.: Move to interface / implement in concrete class (req. for future releases)
$result = $solutions->getSolutionForKey($index);
$answer = $question->getAvailableAnswerOptions($index - 1);
$unit = $solutions->getSolutionForKey($index . "_unit");
$key = null;
if (is_array($unit)) {
$key = $unit['value'];
}
$max_points = $answer->getPoints();
$points = $answer->getReachedPoints($question->getVariables(), $question->getResults(), $result["value"], $key, $question->getUnitrepository()->getUnits());
$percentage = 0;
if ($max_points != 0) {
$percentage = (int) (($points / $max_points) * 100);
}
$solutions->setReachedPercentage($percentage);
}
$result = $rightNode->checkResult($solutions, $composite->getPattern(), $index);
} else {
switch ($composite->getPattern()) {
case "&":
$result = $composite->nodes[0] && $composite->nodes[1];
break;
case "|":
$result = $composite->nodes[0] || $composite->nodes[1];
break;
default:
$result = false;
}
}
if ($composite->isNegated()) {
return !$result;
}
return $result;
}