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defmodule Irc.Parser.Mode do
@moduledoc """
Mode change parser
"""
def changes(string, previous) do
list = to_charlist(string)
acc_changes(list, nil, previous)
end
defp acc_changes([?+ | rest], _, acc) do
acc_changes(rest, true, acc)
end
defp acc_changes([?- | rest], _, acc) do
acc_changes(rest, false, acc)
end
defp acc_changes([0x20 | _], _, acc), do: acc
defp acc_changes([char | rest], action, acc) do
acc = if action do
[char | acc]
else
List.delete(acc, char)
end
acc_changes(rest, action, acc)
end
defp acc_changes([], _, acc), do: acc
end
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