42 lines
1.5 KiB
Python
42 lines
1.5 KiB
Python
# Pyrogram - Telegram MTProto API Client Library for Python
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# Copyright (C) 2017-2019 Dan Tès <https://github.com/delivrance>
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#
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# This file is part of Pyrogram.
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#
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# Pyrogram is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by 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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# Pyrogram 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 Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.
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import re
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from struct import unpack
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# SMP = Supplementary Multilingual Plane: https://en.wikipedia.org/wiki/Plane_(Unicode)#Overview
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SMP_RE = re.compile(r"[\U00010000-\U0010FFFF]")
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def add_surrogates(text):
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# Replace each SMP code point with a surrogate pair
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return SMP_RE.sub(
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lambda match: # Split SMP in two surrogates
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"".join(chr(i) for i in unpack("<HH", match.group().encode("utf-16le"))),
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text
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)
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def remove_surrogates(text):
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# Replace each surrogate pair with a SMP code point
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return text.encode("utf-16", "surrogatepass").decode("utf-16")
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def replace_once(source: str, old: str, new: str, start: int):
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return source[:start] + source[start:].replace(old, new, 1)
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