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defmodule Irc.Mask do
@type t :: %__MODULE__{nick: nil | String.t(), user: nil | String.t(), host: nil | String.t(), server: nil | String.t()}
defstruct [:nick, :user, :host, :server]
@spec parse(String.t) :: {:ok, t()} | {:error, :invalid_mask}
def parse(string) do
cond do
String.contains?(string, "!") -> parse_user_mask(string)
String.contains?(string, ".") -> parse_server_mask(string)
true -> {:error, :invalid_mask}
end
end
def new(nick, user, host) do
%__MODULE__{nick: nick, user: user, host: host}
end
def to_string(%__MODULE__{server: nil, nick: nick, user: user, host: host}) do
Enum.join([nick, "!", user, "@", host])
end
def to_string(%__MODULE__{server: server}), do: server
defp parse_user_mask(string) do
case String.split(string, ~r/[!@]/, parts: 3) do
[nick, user, host] ->
{:ok, %__MODULE__{nick: nick, user: user, host: host}}
_ ->
{:error, :invalid_mask}
end
end
defp parse_server_mask(string) do
{:ok, %__MODULE__{server: string}}
end
defimpl String.Chars, for: __MODULE__ do
@moduledoc false
defdelegate to_string(struct), to: Irc.Mask
end
defimpl Inspect, for: __MODULE__ do
@moduledoc false
import Inspect.Algebra
def inspect(struct, _opts) do
concat(["#Irc.Mask<", Irc.Mask.to_string(struct), ">"])
end
end
end
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