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defmodule Irc.Parser.Prefix do
@moduledoc """
Parser for prefixes.
Supports multi-prefix.
"""
@spec parse(String.t, Irc.Connection.t) :: {modes :: [String.t], rest :: nil | String.t}
@doc """
If `lax` is set to true, the parser will ignore chars until it meets a known prefix.
"""
def parse(string, conn, lax \\ false) do
map = Map.get(conn.isupport, "PREFIX") || %{}
{prefixes, rest} = parse_prefix(string, Map.keys(map), lax)
modes = Enum.map(prefixes, fn(p) -> Map.get(map, p) end)
|> Enum.filter(fn(p) -> p end)
{Enum.reverse(modes), to_string(Enum.reverse(rest))}
end
defp parse_prefix(string, all_prefixes, lax) do
parse_prefix(to_charlist(string), to_charlist(all_prefixes), [], [], lax)
end
defp parse_prefix(all = [prefix | rest], all_prefixes, acc, ign, lax) do
prefix_str = to_string([prefix])
cond do
Enum.member?(all_prefixes, prefix_str) -> parse_prefix(rest, all_prefixes, [prefix_str | acc], ign, lax)
lax && acc == [] -> parse_prefix(rest, all_prefixes, acc, [prefix | ign], lax)
true -> parse_lax(all, acc, [])
end
end
defp parse_prefix([], _, acc, ign, _) do
{acc, ign}
end
defp parse_lax([a | rest], prefixes, acc) do
parse_lax(rest, prefixes, [a | acc])
end
defp parse_lax([], prefixes, acc) do
{prefixes, acc}
end
end
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