85 lines
2.3 KiB
Python
85 lines
2.3 KiB
Python
#!/usr/bin/env python
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# encoding: utf-8
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from .renderable import Renderable
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__all__ = ['Step']
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class Step(Renderable):
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"""
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A step is a Renderable which his only goal is to be render.
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"""
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@classmethod
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def tmp_render(cls):
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""" Create a container in which the method explain return only Step object.
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>>> from .expression import Expression
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>>> exp = Expression("2*3/5")
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>>> print(exp)
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2 \\times \\frac{ 3 }{ 5 }
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>>> for i in exp.simplify().explain():
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... print(i)
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2 \\times \\frac{ 3 }{ 5 }
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\\frac{ 3 }{ 5 } \\times 2
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\\frac{ 3 \\times 2 }{ 5 }
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\\frac{ 6 }{ 5 }
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>>> with Step.tmp_render():
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... for i in exp.simplify().explain():
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... print(repr(i))
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< Step [2, 3, 5, /, *]>
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< Step [3, 5, /, 2, *]>
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< Step [3, 2, *, 5, /]>
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< Step [6, 5, /]>
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>>> for i in exp.simplify().explain():
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... print(i)
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2 \\times \\frac{ 3 }{ 5 }
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\\frac{ 3 }{ 5 } \\times 2
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\\frac{ 3 \\times 2 }{ 5 }
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\\frac{ 6 }{ 5 }
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"""
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return super(Step, cls).tmp_render(Step)
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def __init__(self, exp):
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"""Initiate the renderable objet
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:param pstf_tokens: the postfix list of tokens
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>>> s = Step([2, 3, '+'])
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>>> s
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< Step [2, 3, '+']>
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>>> s1 = Step([s, 5, '*'])
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>>> s1
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< Step [2, 3, '+', 5, '*']>
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"""
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if isinstance(exp, Renderable):
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self.postfix_tokens = exp.postfix_tokens
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elif isinstance(exp, list):
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self.postfix_tokens = []
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for t in exp:
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try:
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self.postfix_tokens += t.postfix_tokens
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except AttributeError:
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self.postfix_tokens.append(t)
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else:
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raise ValueError(
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"Can't initiate Step with {}".format(
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exp
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))
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def __eq__(self, other):
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try:
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if self.postfix_tokens == other.postfix_tokens:
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return True
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except AttributeError:
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return False
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return False
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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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