Mapytex/mapytex/calculus/core/MO/mo.py

246 lines
6.2 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.
from decimal import Decimal
from .exceptions import MOError
from ..coroutine import coroutine, STOOOP
from ..renders import tree2txt, tree2tex
from functools import total_ordering
__all__ = ["moify", "MO", "MOstr"]
@coroutine
def moify(target):
""" Coroutine which try to convert everything into an MO """
try:
target_ = target()
except TypeError:
target_ = target
try:
while True:
tok = yield
try:
target_.send(MOnumber(tok))
except MOError:
try:
target_.send(MOstr(tok))
except MOError:
target_.send(tok)
except STOOOP as err:
yield target_.throw(err)
class MO(object):
"""MO for math object
This base class is representing int and Decimal.
:attr value: sympy compatible version of the MO
:attr _tree: tree version of the MO
"""
def __init__(self, value):
""" Initiate the MO
It should be idempotent.
>>> a = MO(3)
>>> a
<MO 3>
>>> a = MO(a)
>>> a
<MO 3>
"""
try:
self._tree = value._tree
except AttributeError:
self._tree = value
self.is_scalar = True
@classmethod
def factory(cls, value):
""" Factory to ensure that a value is a MO before using it
Idempotent??
>>> MO.factory("x")
<MOstr x>
>>> MO.factory(2)
<MOnumber 2>
>>> MO.factory(2.3)
<MOnumber 2.29999999999999982236431605997495353221893310546875>
>>> MO.factory(Decimal("2.3"))
<MOnumber 2.3>
>>> x = MO.factory("x")
>>> MO.factory(x)
<MOstr x>
"""
if isinstance(value, str):
return MOstr(value)
elif isinstance(value, int) \
or isinstance(value, Decimal) \
or isinstance(value, float):
return MOnumber(value)
elif isinstance(value, MO):
return value
raise MOError("Can't convert it into a MO."
f"Need str, int, Decimal, float or MO, got {value}")
def __repr__(self):
return f"<{self.__class__.__name__} {self.__txt__}>"
def __str__(self):
return str(self._tree)
@property
def __txt__(self):
try:
return tree2txt(self._tree)
except AttributeError:
return str(self._tree)
@property
def __tex__(self):
try:
return tree2tex(self._tree)
except AttributeError:
return str(self._tree)
def __hash__(self):
return self._tree.__hash__()
def __eq__(self, other):
""" == a MOnumber """
try:
return self._tree == other._tree
except AttributeError:
return self._tree == other
@total_ordering
class MOnumber(MO):
""" Base number math object (int or Decimal) """
def __init__(self, value):
""" Initiate a number MO
>>> MOnumber(23)
<MOnumber 23>
>>> MOnumber(-23)
<MOnumber - 23>
>>> MOnumber(23.3)
<MOnumber 23.300000000000000710542735760100185871124267578125>
>>> MOnumber(Decimal("23.3"))
<MOnumber 23.3>
>>> MOnumber(Decimal("-23.3"))
<MOnumber - 23.3>
>>> a = MOnumber(23)
>>> MOnumber(a)
<MOnumber 23>
>>> MOnumber("a")
Traceback (most recent call last):
...
mapytex.calculus.core.MO.exceptions.MOError: The value of an MOnumber need to be a int, a float or a Decimal
"""
try:
val = value._tree
except AttributeError:
val = value
if isinstance(val, (int, Decimal)):
MO.__init__(self, val)
elif isinstance(val, float):
MO.__init__(self, Decimal(val))
else:
raise MOError("The value of an MOnumber need to be a int, a float or a Decimal")
self.value = self._tree
@property
def __txt__(self):
if self.value >= 0:
return str(self.value)
return f"- {abs(self.value)}"
@property
def __tex__(self):
if self.value > 0:
return str(self.value)
return f"- {abs(self.value)}"
def __lt__(self, other):
""" < a MOnumber """
try:
return self.value < other.value
except AttributeError:
return self.value < other
class MOstr(MO):
""" Unknown math object like x or n"""
def __init__(self, value):
""" Initiate a string MO
>>> a = MOstr("x")
>>> a
<MOstr x>
>>> b = MOstr(a)
>>> b
<MOstr x>
>>> a = MOstr("+")
Traceback (most recent call last):
...
mapytex.calculus.core.MO.exceptions.MOError: An MOstr should be initiate with a alpha string, got +
>>> MOstr("ui")
Traceback (most recent call last):
...
mapytex.calculus.core.MO.exceptions.MOError: An MOstr should be initiate with a single caracter string, got ui
>>> MOstr(2)
Traceback (most recent call last):
...
mapytex.calculus.core.MO.exceptions.MOError: An MOstr should be initiate with a string - the unknown, got 2
"""
try:
val = value._tree
except AttributeError:
val = value
if not isinstance(val, str):
raise MOError(f"An MOstr should be initiate with a string - the unknown, got {val}")
if len(val) != 1:
raise MOError(f"An MOstr should be initiate with a single caracter string, got {val}")
if not val.isalpha():
raise MOError(f"An MOstr should be initiate with a alpha string, got {val}")
MO.__init__(self, val)
self.is_scalar = False
self._variable = val
@property
def variable(self):
return self._variable
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