91 lines
1.8 KiB
Python
91 lines
1.8 KiB
Python
#! /usr/bin/env python
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# -*- coding: utf-8 -*-
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# vim:fenc=utf-8
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#
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# Copyright © 2017 lafrite <lafrite@Poivre>
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#
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# Distributed under terms of the MIT license.
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"""
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Expression
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"""
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from ..core import Tree, compute, tree2txt, tree2tex
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class Expression(object):
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"""
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Expression class
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:example:
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>>> e = Expression.from_str("2+3*4")
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>>> e2 = e.simplify()
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>>> print(e2)
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14
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>>> e2.explain()
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'2 + 3 * 4'
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'2 + 12'
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'15'
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"""
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RENDER = tree2txt
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def __init__(self, tree):
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"""
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"""
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self._tree = tree
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@classmethod
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def from_str(cls, string):
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""" Initiate the expression from a string
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:param string: TODO
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:returns: TODO
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"""
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t = Tree.from_str(string)
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return cls(t)
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@classmethod
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def random(self, template, conditions = [], shuffle = False):
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""" Initiate randomly the expression
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:param template: the template of the expression
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:param conditions: conditions on randomly generate variable
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:param shuffle: allowing to shuffle the tree
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:returns: TODO
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"""
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pass
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@classmethod
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def set_render(cls, render):
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""" Define default render function
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:param render: render function Tree -> str
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:example:
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>>> e = Expression.from_str("2+3*4")
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>>> print(e)
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2 + 3 * 4
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>>> Expression.set_render(tree2tex)
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>>> print(e)
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2 + 3 \\times 4
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"""
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cls.RENDER = render
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def __str__(self):
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return self.__class__.RENDER(self._tree)
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def __repr__(self):
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return f"<Tree {self.__class__.RENDER(self._tree)}>"
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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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