pesterchum/oyoyo/parse.py
2021-04-01 22:15:38 +02:00

107 lines
3.5 KiB
Python

# Copyright (c) 2008 Duncan Fordyce
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import logging
import sys
from oyoyo.ircevents import *
# Python < 3 compatibility
if sys.version_info < (3,):
class bytes(object):
def __new__(self, b='', encoding='utf8'):
return str(b)
def parse_raw_irc_command(element):
"""
This function parses a raw irc command and returns a tuple
of (prefix, command, args).
The following is a psuedo BNF of the input text:
<message> ::= [':' <prefix> <SPACE> ] <command> <params> <crlf>
<prefix> ::= <servername> | <nick> [ '!' <user> ] [ '@' <host> ]
<command> ::= <letter> { <letter> } | <number> <number> <number>
<SPACE> ::= ' ' { ' ' }
<params> ::= <SPACE> [ ':' <trailing> | <middle> <params> ]
<middle> ::= <Any *non-empty* sequence of octets not including SPACE
or NUL or CR or LF, the first of which may not be ':'>
<trailing> ::= <Any, possibly *empty*, sequence of octets not including
NUL or CR or LF>
<crlf> ::= CR LF
"""
try:
element = element.decode("utf-8")
except:
try:
element = element.decode("latin-1")
except:
# This shouldn't happen, but if it does:
element = ""
parts = element.strip().split(" ")
if parts[0].startswith(':'):
prefix = parts[0][1:]
command = parts[1]
args = parts[2:]
else:
prefix = None
command = parts[0]
args = parts[1:]
if command.isdigit():
try:
command = numeric_events[command]
except KeyError:
logging.warn('unknown numeric event %s' % command)
command = command.lower()
if args[0].startswith(':'):
args = [" ".join(args)[1:]]
else:
for idx, arg in enumerate(args):
if arg.startswith(':'):
args = args[:idx] + [" ".join(args[idx:])[1:]]
break
return (prefix, command, args)
def parse_nick(name):
""" parse a nickname and return a tuple of (nick, mode, user, host)
<nick> [ '!' [<mode> = ] <user> ] [ '@' <host> ]
"""
try:
nick, rest = name.split('!')
except ValueError:
return (name, None, None, None)
try:
mode, rest = rest.split('=')
except ValueError:
mode, rest = None, rest
try:
user, host = rest.split('@')
except ValueError:
return (name, mode, rest, None)
return (name, mode, user, host)