或类似的功能，以防万一的声明？或者也许是更通用的模式？

发布于 2024-11-26 07:49:48 字数 717 浏览 0 评论 0原文

我已经学习 Erlang 一段时间了，为了学习它，我正在编写一个 IRC 机器人。该 IRC 机器人应该侦听“!command”和“Nick: command”形式的命令。我预先解析了 IRC 协议，以便我只需匹配发送消息。我正在使用这样的二进制模式来执行此操作：

case Msg of
    [Nick, _, <<"PRIVMSG">>, <<"#",Channel/binary>>, <<"!rock">>] ->
        irckybot_api:privmsg(<<"#",Channel/binary>>, [Nick, choose_hand(rock)]),
        {ok, State};
    [Nick, _, <<"PRIVMSG">>, <<"#",Channel/binary>>, <<BNick:Len/binary,": rock">>] ->
        irckybot_api:privmsg(<<"#",Channel/binary>>, [Nick, choose_hand(rock)]),
        {ok, State};
end

我必须为此编写两个模式，对吗？我不能将两种模式合并为一种吗？也许有更通用的模式？我真的不知道……

LG， CK

原文

I've been learning Erlang for a while now, and for to learn it I'm writing a IRC bot. This IRC bot should listen to commands in the „!command“ and the „Nick: command“ form. I pre-parse the IRC protocol so that I have to match the send message only. I'm doing this with binary patterns like this:

case Msg of
    [Nick, _, <<"PRIVMSG">>, <<"#",Channel/binary>>, <<"!rock">>] ->
        irckybot_api:privmsg(<<"#",Channel/binary>>, [Nick, choose_hand(rock)]),
        {ok, State};
    [Nick, _, <<"PRIVMSG">>, <<"#",Channel/binary>>, <<BNick:Len/binary,": rock">>] ->
        irckybot_api:privmsg(<<"#",Channel/binary>>, [Nick, choose_hand(rock)]),
        {ok, State};
end

Am I right that I have to write two patterns for this? Can't I consolidate the two patterns to one? Maybe with a more generic pattern? I don't really know…

LG,
CK

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仙女山的月亮 2024-12-03 07:49:48

我想它可以更好地写成：

case Msg of
  [Nick, _, <<"PRIVMSG">>, <<"#",Channel/binary>>, X] ->
    case X of
       <<"!rock">> -> ....;
       <<BNick:Len/binary,": rock">> -> .......
    end;
  _ -> .......
end

I guess it could be better written as :

case Msg of
  [Nick, _, <<"PRIVMSG">>, <<"#",Channel/binary>>, X] ->
    case X of
       <<"!rock">> -> ....;
       <<BNick:Len/binary,": rock">> -> .......
    end;
  _ -> .......
end

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