226 lines
6.5 KiB
Python
226 lines
6.5 KiB
Python
#!/usr/bin/env python
|
|
# encoding: utf-8
|
|
|
|
from .render import Renderable
|
|
from decimal import Decimal
|
|
from .generic import transpose_fill
|
|
|
|
|
|
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):
|
|
super(Explicable, self).__init__()
|
|
self.steps = []
|
|
self.explainator = 0
|
|
|
|
def explain(self):
|
|
r""" Generate and render steps which leed to itself
|
|
|
|
After beening explained, the Explicable become amnesiac.
|
|
See 'history_generator' to explain it once again.
|
|
|
|
>>> 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
|
|
>>> # Now action is amnesiac
|
|
>>> for i in action.explain():
|
|
... print(i)
|
|
|
|
"""
|
|
if not self.explainator:
|
|
self.explainator = self.history_generator()
|
|
|
|
return self.explainator
|
|
|
|
def history_generator(self):
|
|
r""" Generator for rendered steps which leed to itself
|
|
|
|
This is the called method in explain which create the generator.
|
|
It create a new generator at each call.
|
|
|
|
>>> action = Explicable()
|
|
>>> from .expression import Expression
|
|
>>> action.postfix_tokens = Expression('42')
|
|
>>> for i in action.history_generator():
|
|
... print(i)
|
|
42
|
|
>>> action.this_append_before([Expression('2+10*4'), Expression('2+40')])
|
|
>>> for i in action.history_generator():
|
|
... print(i)
|
|
2 + 10 \times 4
|
|
2 + 40
|
|
42
|
|
>>> for i in action.history_generator():
|
|
... print(i)
|
|
2 + 10 \times 4
|
|
2 + 40
|
|
42
|
|
"""
|
|
old_s = ''
|
|
try:
|
|
for s in self.steps:
|
|
try:
|
|
new_s = self.STR_RENDER(s.postfix_tokens)
|
|
except AttributeError:
|
|
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:
|
|
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
|
|
|
|
@staticmethod
|
|
def merge_history(expl1, expl2, operation):
|
|
r""" Take two Explicable objects, explain where they are from and merge their history
|
|
|
|
This method try to use 'explain' method from expl1 and expl2. This means that after using this method, those two objects will become amnesiac.
|
|
|
|
:param expl1: fist explicable
|
|
:param expl2: second explicable
|
|
:param operation: the operation that link them
|
|
:returns: the list of steps
|
|
|
|
>>> from .expression import Expression
|
|
>>> from .operator import op
|
|
>>> action1 = Explicable()
|
|
>>> action1.postfix_tokens = Expression('42')
|
|
>>> action1.this_append_before([Expression('2+10*4'), Expression('2+40')])
|
|
>>> action2 = Explicable()
|
|
>>> action2.postfix_tokens = Expression('24')
|
|
>>> action2.this_append_before([Expression('2*12')])
|
|
>>> m_history = Explicable().merge_history(action1, action2, op.add)
|
|
>>> m_history
|
|
<generator object transpose_fill ...>
|
|
>>> for i in m_history:
|
|
... print(i)
|
|
['2 + 10 \\times 4', '2 \\times 12', +]
|
|
['2 + 40', '24', +]
|
|
['42', '24', +]
|
|
>>> for i in action1.explain():
|
|
... print(i)
|
|
|
|
>>> action1 = Explicable()
|
|
>>> action1.postfix_tokens = Expression('42')
|
|
>>> action1.this_append_before([Expression('2+10*4'), Expression('2+40')])
|
|
>>> m_history = Explicable().merge_history(action1, 12, op.add)
|
|
>>> m_history
|
|
<generator object transpose_fill ...>
|
|
>>> for i in m_history:
|
|
... print(i)
|
|
['2 + 10 \\times 4', 12, +]
|
|
['2 + 40', 12, +]
|
|
['42', 12, +]
|
|
"""
|
|
try:
|
|
steps1 = list(expl1.explain())
|
|
except AttributeError:
|
|
steps1 = [expl1]
|
|
|
|
try:
|
|
steps2 = list(expl2.explain())
|
|
except AttributeError:
|
|
steps2 = [expl2]
|
|
return transpose_fill([steps1, steps2, [operation]])
|
|
|
|
|
|
class Explicable_int(int, Explicable):
|
|
|
|
""" An Explicable_int is an int which can be explain """
|
|
|
|
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)
|
|
|
|
|
|
class Explicable_Decimal(Decimal, Explicable):
|
|
|
|
""" An Explicable_Decimal is an decimal which can be explain """
|
|
|
|
isNumber = True
|
|
|
|
def __init__(self, val):
|
|
super(Explicable_Decimal, self).__init__(val)
|
|
self._val = val
|
|
self.postfix_tokens = [self]
|
|
self.steps = []
|
|
|
|
def simplify(self):
|
|
return Explicable_Decimal(self._val)
|
|
|
|
def __txt__(self):
|
|
return str(self._val)
|
|
|
|
def __tex__(self):
|
|
return str(self._val)
|
|
|
|
|
|
# -----------------------------
|
|
# Reglages pour 'vim'
|
|
# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
|
|
# cursor: 16 del
|