63 lines
2.4 KiB
Python
63 lines
2.4 KiB
Python
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# reminder - A maubot plugin that reacts to messages that match predefined rules.
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# Copyright (C) 2019 Tulir Asokan
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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from typing import Callable, List, Optional
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import re
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class BlankMatch:
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@staticmethod
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def groups() -> List[str]:
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return []
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class SimplePattern:
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_ptm = BlankMatch()
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matcher: Callable[[str], bool]
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ignorecase: bool
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def __init__(self, matcher: Callable[[str], bool], ignorecase: bool) -> None:
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self.matcher = matcher
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self.ignorecase = ignorecase
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def search(self, val: str) -> BlankMatch:
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if self.ignorecase:
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val = val.lower()
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if self.matcher(val):
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return self._ptm
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@staticmethod
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def compile(pattern: str, flags: re.RegexFlag = re.RegexFlag(0), force_raw: bool = False
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) -> Optional['SimplePattern']:
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ignorecase = flags == re.IGNORECASE
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s_pattern = pattern.lower() if ignorecase else pattern
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esc = ""
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if not force_raw:
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esc = re.escape(pattern)
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first, last = pattern[0], pattern[-1]
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if first == '^' and last == '$' and (force_raw or esc == f"\\^{pattern[1:-1]}\\$"):
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s_pattern = s_pattern[1:-1]
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return SimplePattern(lambda val: val == s_pattern, ignorecase=ignorecase)
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elif first == '^' and (force_raw or esc == f"\\^{pattern[1:]}"):
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s_pattern = s_pattern[1:]
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return SimplePattern(lambda val: val.startswith(s_pattern), ignorecase=ignorecase)
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elif last == '$' and (force_raw or esc == f"{pattern[:-1]}\\$"):
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s_pattern = s_pattern[:-1]
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return SimplePattern(lambda val: val.endswith(s_pattern), ignorecase=ignorecase)
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elif force_raw or esc == pattern:
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return SimplePattern(lambda val: s_pattern in val, ignorecase=ignorecase)
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return None
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