97 lines
3.1 KiB
Python
97 lines
3.1 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.
|
|
|
|
"""
|
|
Tokens represents MathObject at API level
|
|
|
|
"""
|
|
from ...core.MO.mo import MO, MOnumber, MOstr
|
|
from ...core.MO.fraction import MOFraction
|
|
from ...core.MO.monomial import MOstrPower, MOMonomial
|
|
from ...core.MO.polynomial import MOpolynomial
|
|
from decimal import Decimal as _Decimal
|
|
|
|
from .number import Integer, Decimal, Fraction
|
|
from .polynomial import Polynomial, Linear, Quadratic
|
|
|
|
__all__ = ["factory"]
|
|
|
|
def factory(exp, name="", ancestor=None):
|
|
""" Transform a Expression with on MathObject (from core) to a appropriate token (from API)
|
|
|
|
:example:
|
|
>>> from ..expression import Expression
|
|
>>> a = Expression(MOnumber(2))
|
|
>>> factory(a)
|
|
<Integer 2>
|
|
>>> a = Expression(MOnumber(2.5))
|
|
>>> factory(a)
|
|
<Decimal 2.5>
|
|
>>> a = Expression(MOFraction(2, 5))
|
|
>>> factory(a)
|
|
<Fraction 2 / 5>
|
|
>>> a = Expression(MOstr('x'))
|
|
>>> factory(a)
|
|
<Linear x>
|
|
>>> a = Expression(MOstrPower('x', 2))
|
|
>>> factory(a)
|
|
<Quadratic x^2>
|
|
>>> a = Expression(MOstrPower('x', 3))
|
|
>>> factory(a)
|
|
<Polynomial x^3>
|
|
>>> a = Expression(MOMonomial(3, 'x', 1))
|
|
>>> factory(a)
|
|
<Linear 3x>
|
|
>>> a = Expression(MOMonomial(3, 'x', 2))
|
|
>>> factory(a)
|
|
<Quadratic 3x^2>
|
|
>>> a = Expression(MOMonomial(3, 'x', 3))
|
|
>>> factory(a)
|
|
<Polynomial 3x^3>
|
|
"""
|
|
mo = exp._tree
|
|
if not isinstance(mo, MO):
|
|
raise TypeError(f"Can't build Token from not computed Expression (got {mo})")
|
|
|
|
if isinstance(mo, MOnumber):
|
|
if isinstance(mo.value, int):
|
|
return Integer(mo, name, ancestor)
|
|
elif isinstance(mo.value, _Decimal):
|
|
return Decimal(mo, name, ancestor)
|
|
|
|
raise TypeError(f"Can't build from MOnumber ({mo}) neither int nor decimal")
|
|
|
|
elif isinstance(mo, MOFraction):
|
|
if isinstance(mo._denominator, MOnumber) and \
|
|
isinstance(mo._numerator, MOnumber):
|
|
return Fraction(mo, name, ancestor)
|
|
|
|
raise TypeError(f"Can't build from MOFraction ({mo}) numerator and denominator are not MOnumber")
|
|
|
|
elif isinstance(mo, (MOstr, MOstrPower, MOMonomial, MOpolynomial)):
|
|
if not isinstance(mo._variable, (MOstr, str)):
|
|
raise TypeError(f"Can't build Polynom over something else than a letter (got {mo._variable})")
|
|
if isinstance(mo, MOstr) or \
|
|
(isinstance(mo, MOMonomial) and mo.power.value == 1) or \
|
|
(isinstance(mo, MOpolynomial) and mo.power.value == 1):
|
|
return Linear(mo, name, ancestor)
|
|
elif (isinstance(mo, MOstrPower) and mo.power.value == 2) or \
|
|
(isinstance(mo, MOMonomial) and mo.power.value == 2) or \
|
|
(isinstance(mo, MOpolynomial) and mo.power.value == 2):
|
|
return Quadratic(mo, name, ancestor)
|
|
else:
|
|
return Polynomial(mo, name, ancestor)
|
|
|
|
else:
|
|
raise TypeError(f"{type(mo)} is unknown MathObject")
|
|
|
|
# -----------------------------
|
|
# Reglages pour 'vim'
|
|
# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
|
|
# cursor: 16 del
|