159 lines
3.7 KiB
Python
159 lines
3.7 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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"""
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Divide MO
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"""
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from ..tree import Tree
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from ..MO.mo import MO, MOnumber
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from ..MO.fraction import MOFraction
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from .exceptions import DivideError
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def divide(left, right):
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""" Perform the addition of left and right
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:param left: left MO
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:param right: right MO
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:returns: Tree or MO
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>>> a = MOnumber(4)
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>>> b = MOnumber(6)
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>>> divide(a, b)
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<MOFraction 4 / 6>
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>>> b = MOnumber(0)
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>>> divide(a, b)
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Traceback (most recent call last):
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...
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mapytex.calculus.core.compute.exceptions.DivideError: Division by zero
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"""
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try:
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right.value
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except AttributeError:
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pass
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else:
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if right.value == 0:
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raise DivideError("Division by zero")
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if right.value == 1:
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return left
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return MULFUNCTIONS[(type(left), type(right))](left, right)
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def monumber_monumber(left, right):
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""" Divide 2 monumbers
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:param left: left MOnumber
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:param right: right MOnumber
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:returns: MONumber
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>>> a = MOnumber(4)
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>>> b = MOnumber(6)
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>>> monumber_monumber(a, b)
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<MOFraction 4 / 6>
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"""
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return MOFraction(left, right)
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def monumber_mofraction(left, right):
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""" Divide a monumber and a mofraction
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:param left: a monumber
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:param right: a mofraction
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:returns: Tree with the multiplication on the numerator
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>>> a = MOnumber(4)
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>>> b = MOFraction(6, 5)
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>>> print(monumber_mofraction(a, b))
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*
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> 4
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> /
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| > 5
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| > 6
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>>> b = MOFraction(6, 5, True)
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>>> print(monumber_mofraction(a, b))
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*
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> 4
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> -
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| > None
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| > /
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| | > 5
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| | > 6
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"""
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if not isinstance(left, MOnumber) or not isinstance(right, MOFraction):
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raise DivideError(f"Wrong type for left (got {left.__class__.__name__}) \
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or right (got {right.__class__.__name__})")
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return Tree("*", left, right.inverse())
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def mofraction_monumber(left, right):
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""" Divide a monumber and a mofraction
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:param left: a mofraction
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:param right: a monumber
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:returns: Tree with a new calculus
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>>> a = MOFraction(6, 5)
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>>> b = MOnumber(4)
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>>> print(mofraction_monumber(a, b))
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*
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> /
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| > 6
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| > 5
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> /
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| > 1
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| > 4
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"""
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if not isinstance(left, MOFraction) or not isinstance(right, MOnumber):
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raise DivideError(f"Wrong type for left (got {left.__class__.__name__})"
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f"or right (got {right.__class__.__name__})")
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right_fraction = MOFraction(1, right)
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return Tree("*", left, right_fraction)
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def mofraction_mofraction(left, right):
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""" Divide two mofractions
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:param left: a mofraction
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:param right: a mofraction
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:returns: Tree with a new calculus
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>>> a = MOFraction(1, 5)
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>>> b = MOFraction(4, 5)
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>>> print(mofraction_mofraction(a, b))
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*
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> /
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| > 1
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| > 5
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> /
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| > 5
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| > 4
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"""
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if not isinstance(left, MOFraction) or not isinstance(right, MOFraction):
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raise AddError(f"Wrong type for left (got {left.__class__.__name__})"
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f"or right (got {right.__class__.__name__})")
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return Tree("*", left, right.inverse())
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# TODO: Faire un décorateur pour un enregistrement automatique |dim. mars 11 18:24:32 EAT 2018
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MULFUNCTIONS = {
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(MOnumber, MOnumber): monumber_monumber,
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(MOnumber, MOFraction): monumber_mofraction,
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(MOFraction, MOnumber): mofraction_monumber,
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(MOFraction, MOFraction): mofraction_mofraction,
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}
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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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