/**
* Process the OutcomeCondition/ResponseCondition according to the current state.
*
* @throws \qtism\runtime\rules\RuleProcessingException
*/
public function process()
{
$state = $this->getState();
$this->pushTrail($this->getRule());
$className = ucfirst($this->getQtiNature());
$nsClass = 'qtism\\data\\rules\\' . $className . 'Condition';
$ruleGetter = "get{$className}Rules";
$statementGetter = "get{$className}";
// + 'If'|'ElseIf'|'Else'
while (count($this->getTrail()) > 0) {
$rule = $this->popTrail();
if (get_class($rule) === $nsClass) {
// Let's try for if.
$ifStatement = call_user_func(array($rule, $statementGetter . 'If'));
$ifExpression = $ifStatement->getExpression();
$exprEngine = new ExpressionEngine($ifExpression, $state);
$value = $exprEngine->process();
if ($value !== null && $value->getValue() === true) {
// Follow the if.
$this->pushTrail(call_user_func(array($ifStatement, $ruleGetter)));
} else {
// Let's try for else ifs.
$followElseIf = false;
$elseIfStatements = call_user_func(array($rule, $statementGetter . 'ElseIfs'));
foreach ($elseIfStatements as $elseIfStatement) {
$elseIfExpression = $elseIfStatement->getExpression();
$exprEngine->setComponent($elseIfExpression);
$value = $exprEngine->process();
if ($value !== null && $value->getValue() === true) {
// Follow the current else if.
$this->pushTrail(call_user_func(array($elseIfStatement, $ruleGetter)));
$followElseIf = true;
break;
}
}
$elseStatement = call_user_func(array($rule, $statementGetter . 'Else'));
if ($followElseIf === false && is_null($elseStatement) === false) {
// No else if followed, the last resort is the else.
$this->pushTrail(call_user_func(array($elseStatement, $ruleGetter)));
}
}
} else {
// $rule is another Rule than OutcomeCondition/ResponseCondition.
$processor = $this->getRuleProcessorFactory()->createProcessor($rule);
$processor->setState($state);
$processor->process();
}
}
}
