Mapytex/pymath/calculus/explicable.py

140 lines
3.5 KiB
Python
Raw Normal View History

#!/usr/bin/env python
# encoding: utf-8
2016-02-13 08:24:31 +00:00
from .render import Renderable
2016-02-15 12:20:24 +00:00
from decimal import Decimal
2015-04-21 16:10:14 +00:00
2016-02-13 03:29:26 +00:00
2015-02-27 16:46:16 +00:00
class Explicable(Renderable):
""" An Explicable object is an object which can be explicable!
2016-02-13 03:29:26 +00:00
It's a parent class of a more classical Expression, Fraction and Polynom (and later square root)
Child class will have the following method
* explain: Generator which return steps which leed to himself
2016-02-13 03:29:26 +00:00
"""
2016-02-13 04:04:08 +00:00
def __init__(self, *args, **kwargs):
2016-02-13 08:24:31 +00:00
super(Explicable, self).__init__()
self.steps = []
2016-02-13 04:04:08 +00:00
def explain(self, noself=True):
r""" Generate and render steps which leed to itself
2016-02-13 03:29:26 +00:00
:param noself: does explain return self
>>> action = Explicable()
>>> from .expression import Expression
>>> action.postfix_tokens = Expression('42')
>>> action.this_append_before([Expression('2+10*4'), Expression('2+40')])
>>> for i in action.explain():
... print(i)
2 + 10 \times 4
2 + 40
42
2016-03-06 15:18:01 +00:00
"""
old_s = ''
# les étapes pour l'atteindre
try:
for s in self.steps:
2016-02-13 08:24:31 +00:00
try:
2015-02-27 17:02:27 +00:00
new_s = self.STR_RENDER(s.postfix_tokens)
2016-02-13 08:24:31 +00:00
except AttributeError:
2015-02-27 17:02:27 +00:00
new_s = self.STR_RENDER(s)
2016-02-13 08:24:31 +00:00
if not self.is_same_step(new_s, old_s):
old_s = new_s
yield new_s
2016-02-13 08:24:31 +00:00
except AttributeError:
pass
if noself:
# Lui même
new_s = self.STR_RENDER(self.postfix_tokens)
if not self.is_same_step(new_s, old_s):
yield new_s
def is_same_step(self, new, old):
"""Return whether the new step is the same than old step
"""
try:
if new.replace(" ", "") == old.replace(" ", ""):
return True
else:
return False
except AttributeError:
if new == old:
return True
else:
return False
def this_append_before(self, steps):
""" Add steps at the beginning of self.steps
:param steps: list of steps that append before
>>> e = Explicable()
>>> s = ['eat', 'sleep']
>>> e.this_append_before(s)
>>> print(e.steps)
['eat', 'sleep']
>>> s0 = ['cook']
>>> e.this_append_before(s0)
>>> print(e.steps)
['cook', 'eat', 'sleep']
"""
self.steps = steps + self.steps
2016-03-06 15:18:01 +00:00
2016-02-13 08:24:31 +00:00
class Explicable_int(int, Explicable):
2016-03-06 15:18:01 +00:00
""" An Explicable_int is an int which can be explain """
2016-03-06 15:18:01 +00:00
2016-02-13 08:24:31 +00:00
isNumber = True
def __init__(self, val):
super(Explicable_int, self).__init__(val)
self._val = val
self.postfix_tokens = [self]
self.steps = []
def simplify(self):
return Explicable_int(self._val)
def __txt__(self):
return str(self._val)
def __tex__(self):
return str(self._val)
2016-03-06 15:18:01 +00:00
2016-02-15 12:20:24 +00:00
class Explicable_Decimal(Decimal, Explicable):
2016-03-06 15:18:01 +00:00
2016-02-15 12:20:24 +00:00
""" An Explicable_Decimal is an decimal which can be explain """
2016-03-06 15:18:01 +00:00
isNumber = True
def __init__(self, val):
2016-02-15 12:20:24 +00:00
super(Explicable_Decimal, self).__init__(val)
self._val = val
self.postfix_tokens = [self]
self.steps = []
def simplify(self):
2016-02-15 12:20:24 +00:00
return Explicable_Decimal(self._val)
def __txt__(self):
return str(self._val)
def __tex__(self):
return str(self._val)
2016-02-13 08:24:31 +00:00
# -----------------------------
# Reglages pour 'vim'
# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
2016-02-13 03:29:26 +00:00
# cursor: 16 del