input.py

import re

regex = {
	'prefix' : re.compile("^:(?P<nick>.+)(?:!(?P<user>.+))(?:@(?P<host>.+))")
}

def read_message (message):
	"""
	Turn an IRC message into an object
	
	http://www.irchelp.org/irchelp/rfc/chapter2.html#c2_3
	
	2.3.1 Message format

	The extracted message is parsed into the components <prefix>, <command> and list of parameters matched either by <middle> or <trailing> components.

	The BNF representation for this is:

	<message> ::=
		[':' <prefix> <space> ] <command> <params>
	<prefix> ::=
		<servername> | <nick> [ '!' <user> ] [ '@' <host> ]
	<command> ::=
		<letter> { <letter> } | <number> <number> <number>
	<space> ::=
		' ' { ' ' }
	<params> ::=
		<space> [ ':' <trailing> | <middle> <params> ]
	<middle> ::=
		<Any *non-empty* sequence of characters not including SPACE or NUL or CR or LF, the first of which may not be ':'>
	<trailing> ::=
		<Any, possibly *empty*, sequence of characters not including NUL or CR or LF>
	
	"""
	
	message = re.search("^(?::(?P<prefix>\S+) )?(?P<command>\w+|\d\d\d) (?P<params>.+)$", message)
	
	if message:
		put = lambda x: "<%s> %s" % (x, message.group(x))
		print (put('prefix'), put('command'), put('params')), "\t", 
	### THIS:
		params, trailing = message.group('params').split(), None
		if params[-1][0] == ':':
			params, trailing = params[:-1], params[-1]
		print params, trailing
	### OR THIS:
		if ' :' in params: 
			params, trailing = line.split(' :', 1)
		else:
			params, trailing = params, None	
		params.split()
	###
	else:
		print message
	
	return