81 lines
1.8 KiB
Python
81 lines
1.8 KiB
Python
"""
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Copyright (C) 2025 283375
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This file is part of "arcaea-apk-assets" (stated as "this program" below).
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This program is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <https://www.gnu.org/licenses/>.
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"""
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from __future__ import annotations
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import re
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from typeguard import typechecked
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@typechecked
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def is_string_blank(string: str) -> bool:
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"""
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Check if a string equals to a blank string after stripped.
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>>> is_string_blank("abc")
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False
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>>> is_string_blank("")
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True
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>>> is_string_blank(" ")
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True
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>>> is_string_blank(" a ")
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False
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"""
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return string.strip() == ""
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@typechecked
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def blank_str_to_none(string: str | None) -> str | None:
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"""
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Convert a blank string (see :func:`~is_string_blank`) to None, otherwise return the
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original string.
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>>> blank_str_to_none("") is None
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True
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>>> blank_str_to_none("abc") == "abc"
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True
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>>> blank_str_to_none(" ") is None
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True
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>>> blank_str_to_none(" abc ") == " abc "
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True
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>>> blank_str_to_none(None) is None
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True
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"""
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if string is None:
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return None
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return None if is_string_blank(string) else string
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@typechecked
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def replace_single_newline(text: str | None) -> str | None:
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if text is None:
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return None
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return re.sub(r"\n+", lambda m: "\n" * (len(m.group()) - 1), text)
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