79 lines
2.3 KiB
Python
79 lines
2.3 KiB
Python
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from sympy.core.logic import fuzzy_and, fuzzy_or, fuzzy_not, fuzzy_xor
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class intervalMembership:
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"""Represents a boolean expression returned by the comparison of
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the interval object.
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Parameters
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==========
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(a, b) : (bool, bool)
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The first value determines the comparison as follows:
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- True: If the comparison is True throughout the intervals.
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- False: If the comparison is False throughout the intervals.
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- None: If the comparison is True for some part of the intervals.
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The second value is determined as follows:
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- True: If both the intervals in comparison are valid.
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- False: If at least one of the intervals is False, else
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- None
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"""
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def __init__(self, a, b):
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self._wrapped = (a, b)
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def __getitem__(self, i):
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try:
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return self._wrapped[i]
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except IndexError:
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raise IndexError(
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"{} must be a valid indexing for the 2-tuple."
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.format(i))
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def __len__(self):
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return 2
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def __iter__(self):
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return iter(self._wrapped)
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def __str__(self):
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return "intervalMembership({}, {})".format(*self)
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__repr__ = __str__
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def __and__(self, other):
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if not isinstance(other, intervalMembership):
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raise ValueError(
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"The comparison is not supported for {}.".format(other))
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a1, b1 = self
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a2, b2 = other
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return intervalMembership(fuzzy_and([a1, a2]), fuzzy_and([b1, b2]))
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def __or__(self, other):
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if not isinstance(other, intervalMembership):
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raise ValueError(
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"The comparison is not supported for {}.".format(other))
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a1, b1 = self
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a2, b2 = other
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return intervalMembership(fuzzy_or([a1, a2]), fuzzy_and([b1, b2]))
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def __invert__(self):
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a, b = self
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return intervalMembership(fuzzy_not(a), b)
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def __xor__(self, other):
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if not isinstance(other, intervalMembership):
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raise ValueError(
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"The comparison is not supported for {}.".format(other))
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a1, b1 = self
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a2, b2 = other
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return intervalMembership(fuzzy_xor([a1, a2]), fuzzy_and([b1, b2]))
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def __eq__(self, other):
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return self._wrapped == other
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def __ne__(self, other):
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return self._wrapped != other
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