252 lines
7.5 KiB
Python
252 lines
7.5 KiB
Python
#!/usr/bin/env python
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# encoding: utf-8
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from .render import Renderable
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from decimal import Decimal
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from .generic import transpose_fill
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class Explicable(Renderable):
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""" An Explicable object is an object which can be explicable!
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It's a parent class of a more classical Expression, Fraction and Polynom (and later square root)
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Child class will have the following method
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* explain: Generator which return steps which leed to himself
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"""
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def __init__(self, *args, **kwargs):
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super(Explicable, self).__init__()
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self.steps = []
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self.explained = 0
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def explain(self):
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r""" Generate and render steps which leed to itself
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After beening explained, the Explicable become amnesiac. It will return itself in a list.
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See 'history_generator' to explain it once again.
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>>> action = Explicable()
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>>> from .expression import Expression
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>>> action.postfix_tokens = Expression('42')
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>>> action.this_append_before([Expression('2+10*4'), Expression('2+40')])
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>>> for i in action.explain():
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... print(i)
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2 + 10 \times 4
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2 + 40
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42
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>>> # Now action is amnesiac
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>>> for i in action.explain():
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... print(i)
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42
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>>> action = Explicable()
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>>> action.postfix_tokens = Expression('42')
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>>> for i in action.explain():
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... print(i)
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42
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"""
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if self.explained:
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return [self.STR_RENDER(self.postfix_tokens)]
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else:
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self.explained = 1
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return self.history_generator()
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def history_generator(self):
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r""" Generator for rendered steps which leed to itself
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This is the called method in explain which create the generator.
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It create a new generator at each call.
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>>> action = Explicable()
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>>> from .expression import Expression
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>>> action.postfix_tokens = Expression('42')
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>>> for i in action.history_generator():
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... print(i)
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42
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>>> action.this_append_before([Expression('2+10*4'), Expression('2+40')])
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>>> for i in action.history_generator():
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... print(i)
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2 + 10 \times 4
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2 + 40
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42
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>>> for i in action.history_generator():
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... print(i)
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2 + 10 \times 4
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2 + 40
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42
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"""
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old_s = ''
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try:
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for s in self.steps:
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try:
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new_s = self.STR_RENDER(s.postfix_tokens)
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except AttributeError:
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new_s = self.STR_RENDER(s)
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if not self.is_same_step(new_s, old_s):
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old_s = new_s
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yield new_s
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except AttributeError:
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pass
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# if noself:
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new_s = self.STR_RENDER(self.postfix_tokens)
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if not self.is_same_step(new_s, old_s):
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yield new_s
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def is_same_step(self, new, old):
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"""Return whether the new step is the same than old step
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"""
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try:
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if new.replace(" ", "") == old.replace(" ", ""):
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return True
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else:
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return False
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except AttributeError:
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if new == old:
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return True
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else:
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return False
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def this_append_before(self, steps):
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""" Add steps at the beginning of self.steps
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:param steps: list of steps that append before
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>>> e = Explicable()
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>>> s = ['eat', 'sleep']
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>>> e.this_append_before(s)
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>>> print(e.steps)
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['eat', 'sleep']
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>>> s0 = ['cook']
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>>> e.this_append_before(s0)
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>>> print(e.steps)
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['cook', 'eat', 'sleep']
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"""
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self.steps = steps + self.steps
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@staticmethod
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def merge_history(explicables):
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r""" Take a list of Explicable objects, explain where they are from and merge their history
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This method try to use 'explain' method from Explicable. This means that after using this method, those objects will become amnesiac.
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:param explicables: list
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:returns: the list of steps
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>>> from .expression import Expression
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>>> action1 = Explicable()
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>>> action1.postfix_tokens = Expression('42')
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>>> action1.this_append_before([Expression('2+10*4'), Expression('2+40')])
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>>> action2 = Explicable()
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>>> action2.postfix_tokens = Expression('24')
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>>> action2.this_append_before([Expression('2*12')])
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>>> m_history = Explicable().merge_history([action1, action2])
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>>> m_history
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<generator object transpose_fill ...>
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>>> for i in m_history:
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... print(i)
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['2 + 10 \\times 4', '2 \\times 12']
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['2 + 40', '24']
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['42', '24']
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>>> # Now they are amnesiac
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>>> for i in action1.explain():
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... print(i)
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42
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>>> m_history = Explicable().merge_history([action1, action2])
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>>> for i in m_history:
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... print(i)
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['42', '24']
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>>> action1 = Explicable()
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>>> action1.postfix_tokens = Expression('42')
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>>> action1.this_append_before([Expression('2+10*4'), Expression('2+40')])
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>>> m_history = Explicable().merge_history([action1, 12])
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>>> m_history
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<generator object transpose_fill ...>
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>>> for i in m_history:
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... print(i)
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['2 + 10 \\times 4', 12]
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['2 + 40', 12]
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['42', 12]
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>>> action1 = Explicable()
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>>> action1.postfix_tokens = Expression('42')
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>>> action1.this_append_before([Expression('2+10*4'), Expression('2+40')])
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>>> action2 = Explicable()
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>>> action2.postfix_tokens = Expression('24')
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>>> action2.this_append_before([Expression('2*12')])
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>>> action3 = Explicable()
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>>> action3.postfix_tokens = Expression('0')
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>>> action3.this_append_before([Expression('3-3')])
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>>> m_history = Explicable().merge_history([action1, action2, action3])
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>>> for i in m_history:
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... print(i)
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['2 + 10 \\times 4', '2 \\times 12', '3 - 3']
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['2 + 40', '24', '0']
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['42', '24', '0']
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>>> m_history = Explicable().merge_history([1,2,3])
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>>> for i in m_history:
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... print(i)
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[1, 2, 3]
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"""
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steps = []
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for expl in explicables:
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try:
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steps.append(list(expl.explain()))
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except AttributeError:
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steps.append([expl])
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return transpose_fill(steps)
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class Explicable_int(int, Explicable):
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""" An Explicable_int is an int which can be explain """
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isNumber = True
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def __init__(self, val):
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super(Explicable_int, self).__init__(val)
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self._val = val
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self.postfix_tokens = [self]
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self.steps = []
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def simplify(self):
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return Explicable_int(self._val)
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def __txt__(self):
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return str(self._val)
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def __tex__(self):
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return str(self._val)
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class Explicable_Decimal(Decimal, Explicable):
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""" An Explicable_Decimal is an decimal which can be explain """
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isNumber = True
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def __init__(self, val):
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super(Explicable_Decimal, self).__init__(val)
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self._val = val
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self.postfix_tokens = [self]
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self.steps = []
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def simplify(self):
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return Explicable_Decimal(self._val)
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def __txt__(self):
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return str(self._val)
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def __tex__(self):
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return str(self._val)
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# -----------------------------
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# Reglages pour 'vim'
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# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
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# cursor: 16 del
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