class Treetop::Runtime::CompiledParser

def parse(input, options = {})
  prepare_to_parse(input)
  @index = options[:index] if options[:index]
  result = send("_nt_#{options[:root] || root}")
  should_consume_all = options.include?(:consume_all_input) ? options[:consume_all_input] : consume_all_input?
  if (should_consume_all && index != input.size)
    if index > max_terminal_failure_index # Otherwise the failure is already explained
      terminal_parse_failure('<END OF INPUT>', true)
    end
    return nil
  end
  return SyntaxNode.new(input, index...(index + 1)) if result == true
  return result
end