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Copy pathutils.py
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43 lines (35 loc) · 1.59 KB
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# Hydrogram - Telegram MTProto API Client Library for Python
# Copyright (C) 2017-2023 Dan <https://github.com/delivrance>
# Copyright (C) 2023-present Hydrogram <https://hydrogram.org>
#
# This file is part of Hydrogram.
#
# Hydrogram is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Hydrogram 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Hydrogram. If not, see <http://www.gnu.org/licenses/>.
import re
from struct import unpack
# SMP = Supplementary Multilingual Plane: https://en.wikipedia.org/wiki/Plane_(Unicode)#Overview
SMP_RE = re.compile(r"[\U00010000-\U0010FFFF]")
def add_surrogates(text):
# Replace each SMP code point with a surrogate pair
return SMP_RE.sub(
lambda match: ( # Split SMP in two surrogates
"".join(chr(i) for i in unpack("<HH", match.group().encode("utf-16le")))
),
text,
)
def remove_surrogates(text):
# Replace each surrogate pair with a SMP code point
return text.encode("utf-16", "surrogatepass").decode("utf-16")
def replace_once(source: str, old: str, new: str, start: int):
return source[:start] + source[start:].replace(old, new, 1)