public function assertExpression(ExpressionInterface $expression)
{
foreach ($this->expression_flattener->flattenExpression($expression) as $expr) {
try {
$this->potentially_empty_checker->isPotentiallyEmpty($expr);
} catch (CircularDependencyException $e) {
throw new InvalidExpressionException("Contains left recursion");
}
}
}
public function assertExpression(ExpressionInterface $expression)
{
foreach ($this->expression_flattener->flattenExpression($expression) as $expr) {
if ($expr instanceof RepeaterExpression === true) {
/** @var \PeterVanDommelen\Parser\Expression\Repeater\RepeaterExpression $expr */
if ($this->is_potentially_empty->isPotentiallyEmpty($expr->getExpression()) === true) {
throw new InvalidExpressionException("Contains a repeater expression that can be empty");
}
}
}
}