127 lines
3.0 KiB
Python
127 lines
3.0 KiB
Python
#! /usr/bin/env python
|
|
# -*- coding: utf-8 -*-
|
|
# vim:fenc=utf-8
|
|
#
|
|
# Copyright © 2017 lafrite <lafrite@Poivre>
|
|
#
|
|
# Distributed under terms of the MIT license.
|
|
|
|
"""
|
|
Multiply MO
|
|
"""
|
|
|
|
from ..tree import Tree
|
|
from ..MO.mo import MO, MOnumber
|
|
from ..MO.fraction import MOFraction
|
|
from .exceptions import MultiplyError
|
|
|
|
|
|
def multiply(left, right):
|
|
""" Perform the addition of left and right
|
|
|
|
:param left: left MO
|
|
:param right: right MO
|
|
:returns: Tree or MO
|
|
|
|
>>> a = MOnumber(4)
|
|
>>> b = MOnumber(6)
|
|
>>> multiply(a, b)
|
|
<MOnumber 24>
|
|
>>> b = MOnumber(0)
|
|
>>> multiply(a, b)
|
|
<MOnumber 0>
|
|
|
|
"""
|
|
if left.value == 0 or right.value == 0:
|
|
return MOnumber(0)
|
|
elif left.value == 1:
|
|
return right
|
|
elif right.value == 1:
|
|
return left
|
|
|
|
return MULFUNCTIONS[(type(left), type(right))](left, right)
|
|
|
|
def monumber_monumber(left, right):
|
|
""" Multiply 2 monumbers
|
|
|
|
:param left: left MOnumber
|
|
:param right: right MOnumber
|
|
:returns: MONumber
|
|
|
|
>>> a = MOnumber(4)
|
|
>>> b = MOnumber(6)
|
|
>>> monumber_monumber(a, b)
|
|
<MOnumber 24>
|
|
|
|
"""
|
|
return MO.factory(left.value * right.value)
|
|
|
|
def monumber_mofraction(left, right):
|
|
""" Multiply a monumber and a mofraction
|
|
|
|
:param left: a monumber
|
|
:param right: a mofraction
|
|
:returns: Tree with the multiplication on the numerator
|
|
|
|
>>> a = MOnumber(4)
|
|
>>> b = MOFraction(6, 5)
|
|
>>> print(monumber_mofraction(a, b))
|
|
/
|
|
> *
|
|
| > 4
|
|
| > 6
|
|
> 5
|
|
>>> b = MOFraction(6, 5, True)
|
|
>>> print(monumber_mofraction(a, b))
|
|
/
|
|
> *
|
|
| > 4
|
|
| > -
|
|
| | > None
|
|
| | > 6
|
|
> 5
|
|
|
|
"""
|
|
if not isinstance(left, MOnumber) or not isinstance(right, MOFraction):
|
|
raise MultiplyError(f"Wrong type for left (got {left.__class__.__name__}) \
|
|
or right (got {right.__class__.__name__})")
|
|
|
|
num = Tree("*", left, right.numerator)
|
|
return Tree("/", num, right._denominator)
|
|
|
|
def mofraction_monumber(left, right):
|
|
""" Adding a monumber and a mofraction
|
|
|
|
:param left: a mofraction
|
|
:param right: a monumber
|
|
:returns: Tree with the number converted into a mofraction
|
|
|
|
>>> a = MOFraction(6, 5)
|
|
>>> b = MOnumber(4)
|
|
>>> print(mofraction_monumber(a, b))
|
|
/
|
|
> *
|
|
| > 6
|
|
| > 4
|
|
> 5
|
|
"""
|
|
|
|
if not isinstance(left, MOFraction) or not isinstance(right, MOnumber):
|
|
raise MultiplyError(f"Wrong type for left (got {left.__class__.__name__})"
|
|
f"or right (got {right.__class__.__name__})")
|
|
|
|
num = Tree("*", left.numerator, right)
|
|
return Tree("/", num, left._denominator)
|
|
|
|
# TODO: Faire un décorateur pour un enregistrement automatique |dim. mars 11 18:24:32 EAT 2018
|
|
MULFUNCTIONS = {
|
|
(MOnumber, MOnumber): monumber_monumber,
|
|
(MOnumber, MOFraction): monumber_mofraction,
|
|
(MOFraction, MOnumber): mofraction_monumber,
|
|
}
|
|
|
|
# -----------------------------
|
|
# Reglages pour 'vim'
|
|
# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
|
|
# cursor: 16 del
|