72 lines
1.8 KiB
Python
72 lines
1.8 KiB
Python
#! /usr/bin/env python
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# -*- coding: utf-8 -*-
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# vim:fenc=utf-8
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#
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# Copyright © 2017 lafrite <lafrite@Poivre>
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#
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# Distributed under terms of the MIT license.
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from mapytex.calculus.core.tree import Tree
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from .mo import MO
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__all__ = ["MOFraction"]
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class MOFraction(MO):
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""" Fraction math object"""
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def __init__(self, numerator, denominator, negative=False):
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""" Initiate the MOFraction
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It can't be indempotent.
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:param numerator: Numerator of the Fraction
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:param denominator: Denominator of the Fraction
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:param negative: Is the fraction negative (not concidering sign of
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numerator or denominator.
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>>> f = MOFraction(2, 3)
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>>> f
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<MOFraction 2 / 3>
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>>> f = MOFraction(2, 3, negative = True)
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>>> f
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<MOFraction - 2 / 3>
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"""
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base_value = Tree("/",
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MO.factory(numerator),
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MO.factory(denominator),
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)
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if negative:
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value = Tree("-", None, base_value)
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else:
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value = base_value
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MO.__init__(self, value)
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self._numerator = numerator
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self._denominator = denominator
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self.negative = negative
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@property
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def numerator(self):
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""" Get the numerator. If self is negative, getting the opposite of the _numerator
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"""
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if self.negative:
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return Tree("-", None, self._numerator)
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return self._numerator
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@property
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def denominator(self):
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return self._denominator
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def inverse(self):
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""" return the inverse fraction """
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return MOFraction(self._denominator,
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self._numerator,
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self.negative)
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# -----------------------------
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# Reglages pour 'vim'
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# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
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# cursor: 16 del
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