122 lines
4.2 KiB
Python
122 lines
4.2 KiB
Python
# Copyright (c) 2008 Duncan Fordyce
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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import logging
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from oyoyo.ircevents import numeric_events
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PchumLog = logging.getLogger("pchumLogger")
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def parse_raw_irc_command(element):
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"""
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This function parses a raw irc command and returns a tuple
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of (prefix, command, args).
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The following is a psuedo BNF of the input text:
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<message> ::= [':' <prefix> <SPACE> ] <command> <params> <crlf>
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<prefix> ::= <servername> | <nick> [ '!' <user> ] [ '@' <host> ]
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<command> ::= <letter> { <letter> } | <number> <number> <number>
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<SPACE> ::= ' ' { ' ' }
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<params> ::= <SPACE> [ ':' <trailing> | <middle> <params> ]
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<middle> ::= <Any *non-empty* sequence of octets not including SPACE
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or NUL or CR or LF, the first of which may not be ':'>
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<trailing> ::= <Any, possibly *empty*, sequence of octets not including
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NUL or CR or LF>
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<crlf> ::= CR LF
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"""
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"""
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When message-tags are enabled, the message pseudo-BNF,
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as defined in RFC 1459, section 2.3.1 is extended as follows:
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<message> ::= ['@' <tags> <SPACE>] [':' <prefix> <SPACE> ] <command> [params] <crlf>
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<tags> ::= <tag> [';' <tag>]*
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<tag> ::= <key> ['=' <escaped_value>]
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<key> ::= [ <client_prefix> ] [ <vendor> '/' ] <key_name>
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<client_prefix> ::= '+'
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<key_name> ::= <non-empty sequence of ascii letters, digits, hyphens ('-')>
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<escaped_value> ::= <sequence of zero or more utf8 characters except NUL, CR, LF, semicolon (`;`) and SPACE>
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<vendor> ::= <host>
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"""
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try:
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element = element.decode("utf-8")
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except UnicodeDecodeError as e:
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PchumLog.debug("utf-8 error %s" % str(e))
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element = element.decode("latin-1", "replace")
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parts = element.strip().split(" ")
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if parts[0].startswith(":"):
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tags = None
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prefix = parts[0][1:]
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command = parts[1]
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args = parts[2:]
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elif parts[0].startswith("@"):
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# Message tag
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tags = parts[0]
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prefix = parts[1][1:]
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command = parts[2]
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args = parts[3:]
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else:
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tags = None
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prefix = None
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command = parts[0]
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args = parts[1:]
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if command.isdigit():
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try:
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command = numeric_events[command]
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except KeyError:
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PchumLog.info("unknown numeric event %s" % command)
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command = command.lower()
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if args[0].startswith(":"):
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args = [" ".join(args)[1:]]
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else:
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for idx, arg in enumerate(args):
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if arg.startswith(":"):
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args = args[:idx] + [" ".join(args[idx:])[1:]]
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break
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return (tags, prefix, command, args)
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def parse_nick(name):
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"""parse a nickname and return a tuple of (nick, mode, user, host)
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<nick> [ '!' [<mode> = ] <user> ] [ '@' <host> ]
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"""
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try:
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nick, rest = name.split("!")
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except ValueError:
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return (name, None, None, None)
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try:
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mode, rest = rest.split("=")
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except ValueError:
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mode, rest = None, rest
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try:
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user, host = rest.split("@")
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except ValueError:
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return (name, mode, rest, None)
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return (name, mode, user, host)
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