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https://github.com/Mayuri-Chan/pyrofork.git
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9105c1a9f3
* The problem with current implementation is when we have nested markdown inside a url the markdown order is messed up. for example link with bold text will be unparsed like this [**github](https://github.com**). Signed-off-by: wulan17 <wulan17@nusantararom.org>
55 lines
2 KiB
Python
55 lines
2 KiB
Python
# Pyrofork - Telegram MTProto API Client Library for Python
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# Copyright (C) 2017-present Dan <https://github.com/delivrance>
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# Copyright (C) 2022-present Mayuri-Chan <https://github.com/Mayuri-Chan>
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#
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# This file is part of Pyrofork.
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#
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# Pyrofork 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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# Pyrofork 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 Pyrofork. 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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def within_surrogate(text, index, *, length=None):
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"""
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`True` if ``index`` is within a surrogate (before and after it, not at!).
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"""
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if length is None:
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length = len(text)
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return (
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1 < index < len(text) and # in bounds
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'\ud800' <= text[index - 1] <= '\udbff' and # previous is
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'\ud800' <= text[index] <= '\udfff' # current is
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)
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