140 lines
4.1 KiB
Python
140 lines
4.1 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, MOnumber, MOstr
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from .exceptions import MOError
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from ..renders import tree2txt, tree2tex
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__all__ = ["MOMonomial"]
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class MOstrPower(MO):
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""" Power of a MOstr """
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def __init__(self, variable, power):
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""" Initiate a MOstrPower
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:param variable: variable of the monomial (a MOstr or later a MOSqrt)
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:param power: non negative interger (MOnumber type)
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>>> MOstrPower("x", 2)
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<MOstrPower x^2>
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>>> MOstrPower(3, 1)
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Traceback (most recent call last):
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...
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mapytex.calculus.core.MO.exceptions.MOError: The variable of a monomial should be convertible into MOstr
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>>> MOstrPower("x", 0)
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Traceback (most recent call last):
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...
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mapytex.calculus.core.MO.exceptions.MOError: The power of a MOstrPower should be greater than 1
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>>> MOstrPower("x", 1)
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Traceback (most recent call last):
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...
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mapytex.calculus.core.MO.exceptions.MOError: The power of a MOstrPower should be greater than 1
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>>> MOstrPower("x", -2)
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Traceback (most recent call last):
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...
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mapytex.calculus.core.MO.exceptions.MOError: The power of a MOstrPower should be greater than 1
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>>> MOstrPower("x", 2.4)
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Traceback (most recent call last):
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...
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mapytex.calculus.core.MO.exceptions.MOError: The power of a monomial should be a integer
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"""
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_variable = MO.factory(variable)
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if not isinstance(_variable, MOstr):
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raise MOError("The variable of a monomial should be convertible into MOstr")
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self._variable = _variable
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_power = MO.factory(power)
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if power <= 1:
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raise MOError("The power of a MOstrPower should be greater than 1")
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elif not isinstance(_power.value, int):
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raise MOError("The power of a monomial should be a integer")
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self._power = _power
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value = Tree("^",
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self._variable,
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self._power
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)
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MO.__init__(self, value)
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@property
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def variable(self):
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return self._variable
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@property
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def power(self):
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return self._power
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class MOMonomial(MO):
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""" Monomial math object"""
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def __init__(self, coefficient, variable):
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""" Initiate the MOMonomial
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:param coefficient: coefficient of the monomial (a non zero constant)
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:param variable: variable of the monomial (a MOstr or later a MOSqrt)
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>>> x = MOstr('x')
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>>> MOMonomial(4, x)
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<MOMonomial 4x>
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>>> x = MOstrPower('x', 2)
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>>> MOMonomial(4, x)
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<MOMonomial 4x^2>
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>>> MOMonomial(0, x)
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Traceback (most recent call last):
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...
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mapytex.calculus.core.MO.exceptions.MOError: The coefficient of a monomial should not be 0
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"""
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_coefficient = MO.factory(coefficient)
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if coefficient == 0:
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raise MOError("The coefficient of a monomial should not be 0")
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self._coefficient = _coefficient
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if not isinstance(variable, (MOstr, MOstrPower)):
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raise
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self._variable = variable
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value = Tree("*",
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self._coefficient,
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self._variable
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)
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MO.__init__(self, value)
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@property
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def coefficient(self):
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return self._coefficient
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@property
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def strpower(self):
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if isinstance(self._variable, MOstr):
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return self._variable
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return self._variable
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@property
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def variable(self):
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if isinstance(self._variable, MOstr):
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return self._variable
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return self._variable.variable
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@property
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def power(self):
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if isinstance(self._variable, MOstr):
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return 1
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return self._variable.power
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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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