/**
  * @param RenderingContextInterface $renderingContext
  * @param string $expression
  * @param array $matches
  * @return integer|float
  */
 public static function evaluateExpression(RenderingContextInterface $renderingContext, $expression, array $matches)
 {
     $expression = trim($expression, '{}');
     list($variable, $type) = explode(' as ', $expression);
     $variable = parent::getTemplateVariableOrValueItself($variable, $renderingContext);
     if (!in_array($type, self::$validTypes)) {
         $type = parent::getTemplateVariableOrValueItself($type, $renderingContext);
     }
     if (!in_array($type, self::$validTypes)) {
         throw new Exception(sprintf('Invalid target conversion type "%s" specified in casting expression', $type));
     }
     return self::convert($variable, $type);
 }
 /**
  * @param RenderingContextInterface $renderingContext
  * @param string $expression
  * @param array $matches
  * @return integer|float
  */
 public static function evaluateExpression(RenderingContextInterface $renderingContext, $expression, array $matches)
 {
     // Split the expression on all recognized operators
     $matches = array();
     preg_match_all('/([+\\-*\\^\\/\\%]|[a-z0-9\\.]+)/s', $expression, $matches);
     $matches[0] = array_map('trim', $matches[0]);
     // Like the BooleanNode, we dumb down the processing logic to not apply
     // any special precedence on the priority of operators. We simply process
     // them in order.
     $variables = $renderingContext->getVariableProvider()->getAll();
     $result = array_shift($matches[0]);
     $result = parent::getTemplateVariableOrValueItself($result, $renderingContext);
     $operator = NULL;
     $operators = array('*', '^', '-', '+', '/', '%');
     foreach ($matches[0] as $part) {
         if (in_array($part, $operators)) {
             $operator = $part;
         } else {
             $part = parent::getTemplateVariableOrValueItself($part, $renderingContext);
             $result = self::evaluateOperation($result, $operator, $part);
         }
     }
     return $result;
 }