/**
* Evaluates a dynamic expression. Acts both as a factory as well as an
* abstraction component to evaluate expressions.
*
* @param DomNode $dataNode The APF DOM node that can be used to retrieve the model information.
* @param string $expressionString The APF dynamic expression string.
*
* @return string The result of the expression evaluation.
* @throws Exception In case evaluation of the given expression fails.
*
* @author Christian Achatz
* @version
* Version 0.1, 29.01.2014<br />
*/
public static function evaluate(DomNode &$dataNode, $expressionString)
{
$parts = explode('->', $expressionString);
try {
// always evaluate the first part separately (even if we have array access expressions later on)
$expression = new ModelEvaluationExpression($parts[0], $dataNode);
$result = $expression->getResult();
foreach ($parts as $part) {
$openingNormalBracket = strpos($part, MethodEvaluationExpression::BRACKET_OPEN);
if ($openingNormalBracket !== false) {
$expression = new MethodEvaluationExpression($part, $result);
$result = $expression->getResult();
} else {
$openingSquareBracket = strpos($part, ArrayAccessEvaluationExpression::BRACKET_OPEN);
if ($openingSquareBracket !== false) {
$expression = new ArrayAccessEvaluationExpression($part, $result);
$result = $expression->getResult();
}
}
}
} catch (Exception $e) {
// re-throw with more content
throw new ParserException('Execution of expression "' . $expressionString . '" failed with message "' . $e->getMessage() . '"', E_USER_ERROR, $e);
}
return $result;
}
public function testInvalidExpression()
{
$this->setExpectedException(ParserException::class);
$model = new ContentModel();
$expression = new MethodEvaluationExpression('getFoo', $model);
$expression->getResult();
}