91 lines
2.6 KiB
Python
91 lines
2.6 KiB
Python
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""" A universal module with functions / classes without dependencies. """
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import functools
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import re
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import os
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_sep = os.path.sep
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if os.path.altsep is not None:
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_sep += os.path.altsep
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_path_re = re.compile(r'(?:\.[^{0}]+|[{0}]__init__\.py)$'.format(re.escape(_sep)))
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del _sep
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def to_list(func):
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def wrapper(*args, **kwargs):
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return list(func(*args, **kwargs))
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return wrapper
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def to_tuple(func):
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def wrapper(*args, **kwargs):
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return tuple(func(*args, **kwargs))
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return wrapper
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def unite(iterable):
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"""Turns a two dimensional array into a one dimensional."""
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return set(typ for types in iterable for typ in types)
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class UncaughtAttributeError(Exception):
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"""
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Important, because `__getattr__` and `hasattr` catch AttributeErrors
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implicitly. This is really evil (mainly because of `__getattr__`).
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Therefore this class originally had to be derived from `BaseException`
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instead of `Exception`. But because I removed relevant `hasattr` from
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the code base, we can now switch back to `Exception`.
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:param base: return values of sys.exc_info().
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"""
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def safe_property(func):
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return property(reraise_uncaught(func))
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def reraise_uncaught(func):
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"""
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Re-throw uncaught `AttributeError`.
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Usage: Put ``@rethrow_uncaught`` in front of the function
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which does **not** suppose to raise `AttributeError`.
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AttributeError is easily get caught by `hasattr` and another
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``except AttributeError`` clause. This becomes problem when you use
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a lot of "dynamic" attributes (e.g., using ``@property``) because you
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can't distinguish if the property does not exist for real or some code
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inside of the "dynamic" attribute through that error. In a well
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written code, such error should not exist but getting there is very
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difficult. This decorator is to help us getting there by changing
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`AttributeError` to `UncaughtAttributeError` to avoid unexpected catch.
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This helps us noticing bugs earlier and facilitates debugging.
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"""
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@functools.wraps(func)
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def wrapper(*args, **kwds):
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try:
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return func(*args, **kwds)
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except AttributeError as e:
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raise UncaughtAttributeError(e) from e
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return wrapper
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class PushBackIterator:
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def __init__(self, iterator):
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self.pushes = []
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self.iterator = iterator
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self.current = None
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def push_back(self, value):
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self.pushes.append(value)
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def __iter__(self):
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return self
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def __next__(self):
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if self.pushes:
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self.current = self.pushes.pop()
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else:
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self.current = next(self.iterator)
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return self.current
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