class Opal::Nodes::Args::Parameters

def initialize(args)
  @args = args.children
end

def on_arg(arg_name)
  %{['req', '#{arg_name}']}
end

def on_blockarg(arg_name)
  arg_name = :& if arg_name == :fwd_block_arg
  %{['block', '#{arg_name}']}
end

def on_kwarg(arg_name)
  %{['keyreq', '#{arg_name}']}
end

def on_kwnilarg
  %{['nokey']}
end

def on_kwoptarg(arg_name, _default_value)
  %{['key', '#{arg_name}']}
end

def on_kwrestarg(arg_name = nil)
  if arg_name
    %{['keyrest', '#{arg_name}']}
  else
    %{['keyrest']}
  end
end

def on_mlhs(*)
  %{['req']}
end

def on_optarg(arg_name, _default_value)
  %{['opt', '#{arg_name}']}
end

def on_restarg(arg_name = nil)
  if arg_name
    arg_name = :* if arg_name == :fwd_rest_arg
    %{['rest', '#{arg_name}']}
  else
    %{['rest']}
  end
end

def on_shadowarg(_arg_name); end

def to_code
  stringified_parameters = @args.map do |arg|
    public_send(:"on_#{arg.type}", *arg)
  end
  "[#{stringified_parameters.compact.join(', ')}]"
end