83 lines
2.1 KiB
Python
83 lines
2.1 KiB
Python
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#! /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, MOError
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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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value = Tree("/",
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MO.factory(numerator),
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MO.factory(denominator),
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)
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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 __txt__(self):
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# TODO: fonctionnement temporaire. Il faudrait utilser un moteur de rendu plus fin. |jeu. mars 8 15:26:49 EAT 2018
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try:
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numerator = self._numerator.__txt__
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except AttributeError:
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numerator = str(self._numerator)
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try:
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denominator = self._denominator.__txt__
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except AttributeError:
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denominator = str(self._denominator)
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return "- "*self.negative + f"{numerator} / {denominator}"
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def __add__(self, other):
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""" Overload * for MOFraction
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:param other: any other MO
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:yields: calculus steps and the final yielded value is a MO.
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>>> f = MOFraction(1, 2)
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>>> g = MOFraction(3, 2)
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"""
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raise NotImplemented
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def __mul__(self, other):
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raise NotImplemented
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def __truediv__(self, other):
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raise NotImplemented
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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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