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73 lines
1.7 KiB
Python
73 lines
1.7 KiB
Python
# -*- coding: utf8 -*-
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from __future__ import absolute_import
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from __future__ import division, print_function, unicode_literals
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import re
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try:
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from contextlib import ignored
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except ImportError:
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from contextlib import contextmanager
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@contextmanager
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def ignored(*exceptions):
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try:
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yield
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except tuple(exceptions):
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pass
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MULTIPLE_WHITESPACE_PATTERN = re.compile(r"\s+", re.UNICODE)
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def is_blank(text):
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"""
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Returns ``True`` if string contains only whitespace characters
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or is empty. Otherwise ``False`` is returned.
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"""
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return not text or text.isspace()
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def shrink_text(text):
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return normalize_whitespace(text.strip())
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def normalize_whitespace(text):
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"""
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Translates multiple whitespace into single space character.
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If there is at least one new line character chunk is replaced
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by single LF (Unix new line) character.
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"""
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return MULTIPLE_WHITESPACE_PATTERN.sub(_replace_whitespace, text)
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def _replace_whitespace(match):
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text = match.group()
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if "\n" in text or "\r" in text:
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return "\n"
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else:
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return " "
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def cached_property(getter):
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"""
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Decorator that converts a method into memoized property.
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The decorator works as expected only for classes with
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attribute '__dict__' and immutable properties.
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"""
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def decorator(self):
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key = "_cached_property_" + getter.__name__
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if not hasattr(self, key):
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setattr(self, key, getter(self))
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return getattr(self, key)
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decorator.__name__ = getter.__name__
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decorator.__module__ = getter.__module__
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decorator.__doc__ = getter.__doc__
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return property(decorator)
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