Mapytex/pymath/explicable.py

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#!/usr/bin/env python
# encoding: utf-8
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from .render import txt, tex
class Renderable(object):
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"""
A Renderable object is an object which can work with Render class. It means that it has to have attribute postfix_tokens.
"""
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STR_RENDER = tex
DEFAULT_RENDER = tex
@classmethod
def set_render(cls, render):
cls.STR_RENDER = render
@classmethod
def get_render(cls):
return cls.STR_RENDER
@classmethod
def set_default_render(cls):
cls.set_render(cls.DEFAULT_RENDER)
@classmethod
def tmp_render(cls, render = tex):
""" Create a container in which Expression render is temporary modify
The default temporary render is Expression in order to perform calculus inside numbers
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>>> from .expression import Expression
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>>> exp = Expression("2*3/5")
>>> print(exp)
2 \\times \\frac{ 3 }{ 5 }
>>> for i in exp.simplify().explain():
... print(i)
2 \\times \\frac{ 3 }{ 5 }
\\frac{ 3 }{ 5 } \\times 2
\\frac{ 3 \\times 2 }{ 5 }
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\\frac{ 6 }{ 5 }
>>> with Expression.tmp_render(txt):
... for i in exp.simplify().explain():
... print(i)
2 * 3 / 5
3 / 5 * 2
( 3 * 2 ) / 5
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6 / 5
>>> for i in exp.simplify().explain():
... print(i)
2 \\times \\frac{ 3 }{ 5 }
\\frac{ 3 }{ 5 } \\times 2
\\frac{ 3 \\times 2 }{ 5 }
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\\frac{ 6 }{ 5 }
# TODO: essayer de ne pas afficher ce changement de position. |lun. avril 6 17:29:56 CEST 2015
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"""
class TmpRenderEnv(object):
def __enter__(self):
self.old_render = Renderable.get_render()
Renderable.set_render(render)
def __exit__(self, type, value, traceback):
Renderable.set_render(self.old_render)
return TmpRenderEnv()
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def __eq__(self, other):
""" Two Renderable objects are the same if they have same postfix_tokens """
try:
return self.postfix_tokens == other.postfix_tokens
except AttributeError:
return False
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class Explicable(Renderable):
""" An Explicable object is an object which can be explicable!
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
"""
def __init__(self, *args, **kwargs):
self.steps = []
def explain(self, noself = True):
""" Generate and render steps which leed to itself
:param noself: does explain return self
"""
old_s = ''
# les étapes pour l'atteindre
try:
for s in self.steps:
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if hasattr(s, 'postfix_tokens'):
new_s = self.STR_RENDER(s.postfix_tokens)
else:
new_s = self.STR_RENDER(s)
if not self.is_same_step(new_s, old_s):
old_s = new_s
yield new_s
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
# -----------------------------
# Reglages pour 'vim'
# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
# cursor: 16 del