class Gherkin::Parser::Parser

def event(ev, line)
  machine.event(ev, line) do |state, expected|
    if @raise_on_error
      raise ParseError.new(state, ev, expected, line)
    else
      @listener.syntax_error(state, ev, expected, line)
      return false
    end
  end
  true
end

def expected
  machine.expected
end

def force_state(state)
  machine.instance_variable_set('@state', state)
end

def initialize(listener, raise_on_error=true, machine_name='root')
  @listener = listener
  @raise_on_error = raise_on_error
  @machines = []
  @machine_name = machine_name
  push_machine(@machine_name)
end

def machine
  @machines[-1]
end

def method_missing(method, *args)
  # TODO: Catch exception and call super
  if(event(method.to_s, args[-1]))
    @listener.send(method, *args)
  end
  if method == :eof
    pop_machine
    push_machine(@machine_name)
  end
end

def pop_machine
  @machines.pop
end

def push_machine(name)
  @machines.push(Machine.new(self, name))
end