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# localslackirc
# Copyright (C) 2022 Salvo "LtWorf" Tomaselli
#
# localslackirc is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# author Salvo "LtWorf" Tomaselli <tiposchi@tiscali.it>
from enum import Enum
from typing import Iterable, NamedTuple, Optional
try:
from emoji import emojize # type: ignore
except ModuleNotFoundError:
def emojize(string:str, use_aliases:bool=False, delimiters: tuple[str,str]=(':', ':')) -> str: # type: ignore
return string
SLACK_SUBSTITUTIONS = [
('&', '&'),
('>', '>'),
('<', '<'),
]
__all__ = [
'SLACK_SUBSTITUTIONS',
'tokenize',
'Itemkind',
'PreBlock',
'SpecialItem',
]
def preblocks(msg: str) -> Iterable[tuple[str, bool]]:
"""
Iterates the preformatted and normal text blocks
in the message.
The boolean indicates if the block is preformatted.
The three ``` ticks are removed by this.
"""
pre = False
while True:
try:
p = msg.index('```')
except ValueError:
break
yield msg[0:p], pre
pre = not pre
msg = msg[p+3:]
yield msg, pre
class Itemkind(Enum):
YELL = 0 # HERE, EVERYONE and such
MENTION = 1 # @user
CHANNEL = 2 # #channel
OTHER = 3 # Everything else
class PreBlock(NamedTuple):
"""
Block of preformatted text
"""
txt: str
@property
def lines(self) -> int:
return self.txt.count('\n')
class SpecialItem(NamedTuple):
"""
A link or a mention
"""
txt: str
@property
def kind(self) -> Itemkind:
k = self.txt[1]
if k == '!':
return Itemkind.YELL
elif k == '@':
return Itemkind.MENTION
elif k == '#':
return Itemkind.CHANNEL
return Itemkind.OTHER
@property
def val(self) -> str:
"""
Return the value
"""
sep = self.txt.find('|')
# No human readable, just take the whole thing
if sep == -1:
sep = len(self.txt) - 1
if self.kind != Itemkind.OTHER:
return self.txt[2:sep]
return self.txt[1:sep]
@property
def human(self) -> Optional[str]:
"""
Return the eventual human readable
message
"""
sep = self.txt.find('|')
if sep == -1:
return None
return self.txt[sep+1:-1]
def split_tokens(msg: str) -> Iterable[SpecialItem|str]:
"""
yields separately the normal text and the special slack
<stuff> items
"""
while True:
try:
begin = msg.index('<')
except ValueError:
break
if begin != 0: # There is stuff before
yield msg[0:begin]
msg = msg[begin:]
else: # Tag at the beginning
end = msg.index('>')
block = msg[0:end + 1]
msg = msg[end + 1:]
yield SpecialItem(block)
if msg:
yield msg
def convertpre(msg: str) -> str:
"""
Fixes a preformatted block so that it can
be displayed by an irc client.
Links can be present in preformatted blocks
with the format <http://> and MAYBE with
<http://blabla|bla> but no channel or user
mentions are allowed, and emoji substitution
should not happen here.
"""
r = []
for t in split_tokens(msg):
if isinstance(t, str):
r.append(t)
continue
if t.kind != Itemkind.OTHER:
raise ValueError(f'Unexpected slack item in preformatted block {t}')
elif t.human: # For some very strange reason slack converts text like "asd.com" into links
r.append(t.human)
else:
r.append(t.val)
l = ''.join(r)
for s in SLACK_SUBSTITUTIONS:
l = l.replace(s[0], s[1])
return l
def tokenize(msg: str) -> Iterable[PreBlock|SpecialItem|str]:
"""
Yields the various possible tokens
Changes the > codes
Puts the emoji in place
"""
for txt, pre in preblocks(msg):
if pre:
yield PreBlock(convertpre(txt))
else:
for t in split_tokens(txt):
if isinstance(t, str):
# Replace emoji codes (e.g. :thumbsup:)
t = emojize(t, language='alias')
# Usual substitutions
for s in SLACK_SUBSTITUTIONS:
t = t.replace(s[0], s[1]) # type: ignore
yield t
|
