Chat server: Difference between revisions

=={{header|CoffeeScript}}==

This is ported from the JavaScript version. The tool js2coffee got me a mostly working version, and then I manually converted JS-style classes to CS "class class" syntax.

<lang coffeescript>

net = require("net")

sys = require("sys")

EventEmitter = require("events").EventEmitter

isNicknameLegal = (nickname) ->

return false unless nickname.replace(/[A-Za-z0-9]*/, "") is ""

for used_nick of @chatters

return false if used_nick is nickname

true

class ChatServer

constructor: ->

@chatters = {}

@server = net.createServer @handleConnection

@server.listen 1212, "localhost"

handleConnection: (connection) =>

console.log "Incoming connection from " + connection.remoteAddress

connection.setEncoding "utf8"

chatter = new Chatter(connection, this)

chatter.on "chat", @handleChat

chatter.on "join", @handleJoin

chatter.on "leave", @handleLeave

handleChat: (chatter, message) =>

@sendToEveryChatterExcept chatter, chatter.nickname + ": " + message

handleJoin: (chatter) =>

console.log chatter.nickname + " has joined the chat."

@sendToEveryChatter chatter.nickname + " has joined the chat."

@addChatter chatter

handleLeave: (chatter) =>

console.log chatter.nickname + " has left the chat."

@removeChatter chatter

@sendToEveryChatter chatter.nickname + " has left the chat."

addChatter: (chatter) =>

@chatters[chatter.nickname] = chatter

removeChatter: (chatter) =>

delete @chatters[chatter.nickname]

sendToEveryChatter: (data) =>

for nickname of @chatters

@chatters[nickname].send data

sendToEveryChatterExcept: (chatter, data) =>

for nickname of @chatters

@chatters[nickname].send data unless nickname is chatter.nickname

class Chatter extends EventEmitter

constructor: (socket, server) ->

EventEmitter.call this

@socket = socket

@server = server

@nickname = ""

@lineBuffer = new SocketLineBuffer(socket)

@lineBuffer.on "line", @handleNickname

@socket.on "close", @handleDisconnect

@send "Welcome! What is your nickname?"

handleNickname: (nickname) =>

if isNicknameLegal(nickname)

@nickname = nickname

@lineBuffer.removeAllListeners "line"

@lineBuffer.on "line", @handleChat

@send "Welcome to the chat, " + nickname + "!"

@emit "join", this

else

@send "Sorry, but that nickname is not legal or is already in use!"

@send "What is your nickname?"

handleChat: (line) =>

@emit "chat", this, line

handleDisconnect: =>

@emit "leave", this

send: (data) =>

@socket.write data + "\r\n"

class SocketLineBuffer extends EventEmitter

constructor: (socket) ->

EventEmitter.call this

@socket = socket

@buffer = ""

@socket.on "data", @handleData

handleData: (data) =>

console.log "Handling data", data

i = 0

while i < data.length

char = data.charAt(i)

@buffer += char

if char is "\n"

@buffer = @buffer.replace("\r\n", "")

@buffer = @buffer.replace("\n", "")

@emit "line", @buffer

console.log "incoming line: #{@buffer}"

@buffer = ""

i++

server = new ChatServer()

</lang>