#! /usr/bin/env python # -*- coding: utf-8 -*- # vim:fenc=utf-8 # # Copyright © 2017 lafrite # # Distributed under terms of the MIT license. """ Tokens representing interger and decimal """ from decimal import Decimal as _Decimal from .token import Token from ...core.arithmetic import gcd from ...core.random.int_gene import filter_random from ...core.MO import MO, MOnumber from ...core.MO.fraction import MOFraction from random import random __all__ = ["Integer", "Decimal"] class Integer(Token): """ Token representing a integer :example: >>> Integer(4) >>> a = MOnumber(4) >>> Integer.from_mo(a) """ def __init__(self, a, name="", ancestor=None): if not isinstance(a, MO): if not isinstance(a, int): raise TypeError mo = MOnumber(a) else: mo = a Token.__init__(self, mo, name, ancestor) self._mathtype = "entier" @classmethod def from_mo(cls, mo, name="", ancestor=None): if not isinstance(mo, MOnumber): raise TypeError if not isinstance(mo.value, int): raise TypeError return cls(mo, name, ancestor) @classmethod def random( cls, name="", min_value=-10, max_value=10, rejected=[0, 1], accept_callbacks=[] ): """ Generate a random Integer :param name: name of the Integer :param min_value: minimum value :param max_value: maximum value :param rejected: rejected values :param accept_callbacks: list of function for value acceptation """ candidate = filter_random(min_value, max_value, rejected, accept_callbacks) return Integer(candidate, name) class Decimal(Token): """ Token representing a decimal :example: >>> Decimal("4.3") >>> Decimal(3.3) >>> Decimal(_Decimal("2.3")) """ def __init__(self, a, name="", ancestor=None): if not isinstance(a, MO): if isinstance(a, _Decimal): mo = MOnumber(a) elif isinstance(a, (str, float)): mo = MOnumber(_Decimal(a)) else: raise TypeError else: mo = a self._mathtype = "décimal" Token.__init__(self, mo, name, ancestor) @classmethod def from_mo(cls, mo, name="", ancestor=None): if not isinstance(mo, MOnumber): raise TypeError if not isinstance(mo.value, _Decimal): raise TypeError return cls(mo, name, ancestor) @classmethod def random( cls, name="", min_value=-10, max_value=10, digits=2, rejected=[0, 1], reject_callbacks=[], ): """ Generate a random Decimal :param name: name of the Integer :param min_value: minimum value :param max_value: maximum value :param digits: digits after comas :param rejected: rejected values :param reject_callbacks: list of function for value rejection """ conditions = [lambda x: x in rejected] + reject_callbacks float_cand = (max_value - min_value) * random() + min_value candidate = _Decimal(f"{float_cand:.{digits}f}") while any(c(candidate) for c in conditions): float_cand = (max_value - min_value) * random() + min_value candidate = _Decimal(f"{float_cand:.{digits}f}") return Decimal(candidate, name) class Fraction(Token): """ Token representing a fraction :example: >>> Fraction("3/4") """ def __init__(self, a, name="", ancestor=None): if not isinstance(a, MO): if isinstance(a, str): num, denom = a.split("/") mo = MOFraction(int(num), int(denom)) else: raise TypeError else: mo = a self._mathtype = "fraction" Token.__init__(self, mo, name, ancestor) @classmethod def from_mo(cls, mo, name="", ancestor=None): if not isinstance(mo, MOFraction): raise TypeError if not isinstance(mo._numerator, MOnumber): raise TypeError if not isinstance(mo._denominator, MOnumber): raise TypeError return cls(mo, name, ancestor) @classmethod def random( cls, name="", fix_num="", min_num=-10, max_num=10, rejected_num=[0], accept_num_callbacks=[], fix_denom="", min_denom=-10, max_denom=10, rejected_denom=[0, 1, -1], accept_denom_callbacks=[], irreductible=False, not_integer=True, ): """ Generate a random Fraction :param name: Name of the fraction :param fix_num: if set, the numerator will get this value :param min_num: minimum value for the numerator :param max_num: maximum value for the numerator :param rejected_num: rejected values for the numerator :param accept_num_callbacks: list of function for numerator rejection :param fix_denom: if set, the denomerator will get this value :param min_denom: minimum value for the denominator :param max_denom: maximum value for the denominator :param rejected_denom: rejected values for the denominator :param accept_denom_callbacks: list of function for denomerator rejection :param irreductible: is the generated fraction necessary irreductible :param not_integer: can the generated fraction be egal to an interger """ if fix_num == "": num = filter_random(min_num, max_num, rejected_num, accept_num_callbacks) else: num = fix_num if fix_denom == "": accept_callbacks = accept_denom_callbacks if irreductible: def prime_with_num(denom): return gcd(num, denom) == 1 accept_callbacks.append(prime_with_num) if not_integer: def not_divise_num(denom): return num % denom != 0 accept_callbacks.append(not_divise_num) denom = filter_random( min_denom, max_denom, rejected_denom, accept_callbacks ) else: denom = fix_denom frac = MOFraction(num, denom) return cls(frac, name) @property def numerator(self): return self._mo.numerator @property def denominator(self): return self._mo.denominator @property def decimal(self): """ return decimal approximation of the fraction :example: >>> f = Fraction("3/4") >>> f.decimal >>> f = Fraction("1/3") >>> f.decimal """ return Decimal(_Decimal(self._mo.numerator._value) / _Decimal(self._mo.denominator._value)) # ----------------------------- # Reglages pour 'vim' # vim:set autoindent expandtab tabstop=4 shiftwidth=4: # cursor: 16 del