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|
defmodule Irc.Parser.Line do
@moduledoc """
IRC line parser/encoder
"""
alias Irc.Line
require Logger
@spec parse(string) :: Line.t()
@doc "Parse a server-to-client line."
def parse(line, owner_module \\ nil, owner \\ nil)
def parse(line, context, _) when is_map(context) do
module = Irc.Context.module(context)
pid = Irc.Context.pid(context)
parse(line)
|> set_owner(module, pid)
end
def parse(line, owner_module, owner) do
{tags, rest} = parse_tags(line)
{source, rest} = parse_source(rest, owner_module, owner)
{command, rest} = parse_cmd(rest)
args = parse_args(rest)
private = %{
owner: owner,
owner_module: owner_module,
at: DateTime.utc_now()
}
%Line{__private__: private, tags: tags, source: source, command: command, args: args}
end
@spec set_owner(Line.t(), module(), pid()) :: Line.t()
def set_owner(line = %Line{__private__: private = %{owner: nil, owner_module: nil}}, module, owner) when is_atom(module) and is_pid(owner) do
private = Map.put(private, :owner_module, module)
|> Map.put(:owner, owner)
%Line{line | __private__: private}
end
def set_owner(line = %Line{__private__: private = %{owner: opid, owner_module: omod}}, module, owner) when is_atom(module) and is_pid(owner) do
Logger.debug("Parser.Line: tried to re-own an already owned line #{inspect {{omod,opid},{module,owner}}}")
line
end
@spec encode(Line.t()) :: String.t
@doc "Encode a line"
def encode(line = %Line{}, conn \\ %Irc.Connection{}) do
[line.source, line.tags, line.command, line.args]
src = if line.source, do: ":"<>to_string(line.source)
tags = Enum.reduce(line.tags, [], fn({k,v}, acc) -> ["#{k}=#{v}" | acc] end)
|> Enum.join(";")
tags = if Irc.Context.capab?(conn, "message-tags") && tags != "", do: "@"<>tags
[tags, src, line.command, encode_args(line.args)]
|> Enum.filter(fn(x) -> x end)
|> Enum.join(" ")
end
# ARGS
defp parse_args(input), do: parse_args(input, [])
defp parse_args(input, acc) do
case parse_arg(input, []) do
{:continue, new, rest} -> parse_args(rest, [new | acc])
{:finished, new} ->
list = new ++ acc
format_args(list)
end
end
# Final argument is the only argument.
defp parse_arg([?: | rest], acc) when length(acc) == 0 do
final = parse_final_arg(rest, [])
{:finished, [final]}
end
defp parse_arg([0x20, ?: | rest], acc) do
final = parse_final_arg(rest, [])
{:finished, [final, acc]}
end
defp parse_arg([0x20 | rest], acc) do
{:continue, acc, rest}
end
defp parse_arg([char | rest], acc) do
parse_arg(rest, [char | acc])
end
defp parse_arg([], acc) do
{:finished, [acc]}
end
defp parse_final_arg([char | rest], acc) do
parse_final_arg(rest, [char | acc])
end
defp parse_final_arg([], acc) do
acc
end
defp format_args(list) when is_list(list) do
list
|> Enum.map(fn(arg) -> String.trim(acc_to_str(arg)) end)
|> Enum.reverse()
end
# COMMAND
defp parse_cmd(input), do: parse_cmd(input, [])
defp parse_cmd([0x20 | rest], acc) do
{acc_to_str(acc), rest}
end
defp parse_cmd([char | rest], acc) do
parse_cmd(rest, [char | acc])
end
# SOURCE
defp parse_source([?: | input], m, p), do: parse_source(input, [], m, p)
defp parse_source(input, _, _), do: {nil, input}
defp parse_source([0x20 | rest], acc, m, p) do
string = acc_to_str(acc)
result = case Irc.Mask.parse(string, m, p) do
{:error, _} -> string
{:ok, mask} -> mask
end
{result, rest}
end
defp parse_source([char | rest], acc, m, p), do: parse_source(rest, [char | acc], m, p)
# TAGS
defp parse_tags([?@ | input]), do: parse_tags(input, [])
defp parse_tags(input), do: {%{}, input}
defp parse_tags(input, acc) do
case parse_tag(input) do
{:continue, new, rest} -> parse_tags([new | acc], rest)
{:finished, new, rest} -> {format_tags([new | acc]), rest}
end
end
defp parse_tag(input) do
parse_tag({[], nil}, input)
end
defp parse_tag({acc, nil}, [?= | rest]) do
parse_tag({acc, []}, rest)
end
defp parse_tag({acc, nil}, [?; | rest]) do
{:continue, {acc, true}, rest}
end
defp parse_tag({acc, nil}, [char | rest]) do
parse_tag({[char | acc], nil}, rest)
end
defp parse_tag({key, acc}, [?; | rest]) do
{:continue, {key, acc}, rest}
end
defp parse_tag({key, acc}, [0x20 | rest]) do
{:finished, {key, acc}, rest}
end
defp parse_tag({key, acc}, [char | rest]) do
parse_tag({key, [char | acc]}, rest)
end
defp format_tags(list) do
list
|> Enum.map(fn({k,v}) ->
{acc_to_str(k), acc_to_str(v)}
end)
|> Enum.into(Map.new)
end
defp acc_to_str([]), do: nil
defp acc_to_str(list) when is_list(list) do
list
|> Enum.reverse()
|> to_string()
end
defp acc_to_str(other), do: other
defp encode_args(args) do
encode_args(args, [])
|> Enum.reverse()
|> Enum.join(" ")
end
defp encode_args([arg], acc) do
[":"<>arg | acc]
end
defp encode_args([arg | rest], acc) do
encode_args(rest, [arg | acc])
end
defp encode_args([], acc), do: acc
end
|
