Tulir Asokan
35 lines
1.4 KiB
Python
35 lines
1.4 KiB
Python
# mautrix-telegram - A Matrix-Telegram puppeting bridge
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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 Optional, Pattern
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import struct
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import re
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# add_surrogates and remove_surrogates are unicode surrogate utility functions from Telethon.
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# Licensed under the MIT license.
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# https://github.com/LonamiWebs/Telethon/blob/7cce7aa3e4c6c7019a55530391b1761d33e5a04e/telethon/helpers.py
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def add_surrogates(text: Optional[str]) -> Optional[str]:
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if text is None:
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return None
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return "".join("".join(chr(y) for y in struct.unpack("<HH", x.encode("utf-16-le")))
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if (0x10000 <= ord(x) <= 0x10FFFF) else x for x in text)
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def remove_surrogates(text: Optional[str]) -> Optional[str]:
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if text is None:
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return None
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return text.encode("utf-16", "surrogatepass").decode("utf-16")
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