300 lines
7.7 KiB
Python
300 lines
7.7 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 AssocialTree, Tree, compute, typing, TypingError
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from .renders import renders
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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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>>> for s in e2.explain():
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... print(s)
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2 + 3 * 4
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2 + 12
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14
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"""
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RENDER = 'txt'
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def __init__(self, tree, ancestor=None):
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"""
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"""
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self._tree = tree
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self._ancestor = ancestor
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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: String to parse to generate the Expression
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:returns: the expression
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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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>>> Expression.RENDER
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'txt'
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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('tex')
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>>> Expression.RENDER
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'tex'
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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 renders[self.RENDER](self._tree)
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def __repr__(self):
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return f"<Exp: {renders[self.RENDER](self._tree)}>"
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def _optimize(self, exclude_nodes=["\\", "**"]):
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""" Return a copy of self with an optimize tree
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:example:
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>>> e = Expression.from_str("2x^2+2x+3x")
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>>> print(e._tree)
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+
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> +
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| > *
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| | > 2
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| | > ^
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| | | > x
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| | | > 2
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| > *
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| | > 2
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| | > x
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> *
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| > 3
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| > x
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>>> print(e._optimize()._tree)
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+
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> *
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| > 2
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| > ^
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| | > x
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| | > 2
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> +
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| > *
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| | > 2
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| | > x
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| > *
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| | > 3
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| | > x
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"""
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try:
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# TODO: need to test exclude_nodes |ven. oct. 5 08:51:02 CEST 2018
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return Expression(self._tree.balance(exclude_nodes=exclude_nodes))
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except AttributeError:
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return self
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def _typing(self):
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""" Build a copy of self with as much typing as possible
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:example:
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>>> e = Expression.from_str("2x")
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>>> print(e._tree.map_on_leaf(type))
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*
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> <class 'mapytex.calculus.core.MO.mo.MOnumber'>
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> <class 'mapytex.calculus.core.MO.mo.MOstr'>
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>>> typed_e = e._typing()
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>>> print(type(typed_e._tree))
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<class 'mapytex.calculus.core.MO.monomial.MOMonomial'>
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>>> typed_e = e._typing()
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>>> print(type(typed_e._tree))
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<class 'mapytex.calculus.core.MO.monomial.MOMonomial'>
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>>> e = Expression.from_str("2x+3+4/5")
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>>> print(e._tree.map_on_leaf(type))
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+
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> +
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| > *
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| | > <class 'mapytex.calculus.core.MO.mo.MOnumber'>
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| | > <class 'mapytex.calculus.core.MO.mo.MOstr'>
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| > <class 'mapytex.calculus.core.MO.mo.MOnumber'>
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> /
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| > <class 'mapytex.calculus.core.MO.mo.MOnumber'>
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| > <class 'mapytex.calculus.core.MO.mo.MOnumber'>
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>>> typed_e = e._typing()
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>>> print(typed_e._tree.map_on_leaf(type))
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+
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> <class 'mapytex.calculus.core.MO.polynomial.MOpolynomial'>
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> <class 'mapytex.calculus.core.MO.fraction.MOFraction'>
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"""
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try:
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t = self._tree.apply_on_last_level(typing)
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except TypingError:
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return self
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except NotImplementedError:
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return self
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except AttributeError:
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return self
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else:
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return Expression(t)._typing()
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def _compute(self):
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"""" Compute one step of self
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"""
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try:
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return Expression(self._tree.apply_on_last_level(compute))
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except AttributeError:
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return self
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def set_ancestor(self, ancestor):
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""" Set ancestor """
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self._ancestor = ancestor
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def simplify(self, optimize=True):
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""" Compute as much as possible the expression
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:param optimize: bool to optimize tree when it's possible
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:return: an expression
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:example:
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>>> e = Expression.from_str("2+3*4")
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>>> e
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<Exp: 2 + 3 \\times 4>
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>>> f = e.simplify()
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>>> f
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<Exp: 14>
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>>> f._ancestor
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<Exp: 2 + 12>
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"""
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if optimize:
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opt_exp = self._optimize()
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else:
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opt_exp = self
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typed_exp = opt_exp._typing()
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comp_exp = typed_exp._compute()
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if typed_exp == comp_exp:
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typed_exp.set_ancestor(self._ancestor)
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return typed_exp
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else:
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comp_exp.set_ancestor(self)
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return comp_exp.simplify(optimize=optimize)
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def explain(self):
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""" Yield every calculus step which have lead to self
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:example:
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>>> e = Expression.from_str("2+3*4")
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>>> f = e.simplify()
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>>> for s in f.explain():
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... print(s)
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2 + 3 * 4
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2 + 12
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14
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>>> e = Expression.from_str("1+2+3+4+5+6+7+8+9")
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>>> f = e.simplify()
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>>> for s in f.explain():
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... print(s)
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1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9
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3 + 3 + 9 + 6 + 7 + 17
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6 + 9 + 6 + 24
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15 + 30
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45
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>>> e = Expression.from_str("1+2+3+4+5+6+7+8+9")
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>>> f_no_balance = e.simplify(optimize=False)
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>>> for s in f_no_balance.explain():
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... print(s)
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1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9
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3 + 3 + 4 + 5 + 6 + 7 + 8 + 9
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6 + 4 + 5 + 6 + 7 + 8 + 9
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10 + 5 + 6 + 7 + 8 + 9
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15 + 6 + 7 + 8 + 9
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21 + 7 + 8 + 9
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28 + 8 + 9
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36 + 9
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45
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>>> e = Expression.from_str("1+2+3+4+5*6*7*8*9")
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>>> f = e.simplify()
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>>> for s in f.explain():
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... print(s)
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1 + 2 + 3 + 4 + 5 * 6 * 7 * 8 * 9
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3 + 3 + 4 + 30 * 7 * 72
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6 + 4 + 210 * 72
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10 + 15120
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15130
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>>> e = Expression.from_str("1+2+3+4+5*6*7*8*9")
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>>> f_no_balance = e.simplify(optimize=False)
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>>> for s in f_no_balance.explain():
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... print(s)
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1 + 2 + 3 + 4 + 5 * 6 * 7 * 8 * 9
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3 + 3 + 4 + 30 * 7 * 8 * 9
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6 + 4 + 210 * 8 * 9
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10 + 1680 * 9
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10 + 15120
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15130
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>>> e = Expression.from_str("1+2/3/4/5")
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>>> f = e.simplify()
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>>> for s in f.explain():
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... print(s)
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1 + 2 / 3 / 4 / 5
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1 + (2 / 3 * 1 / 4) / 5
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1 + (2 * 1) / (3 * 4) / 5
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1 + 2 / 12 / 5
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1 + 2 / 12 * 1 / 5
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1 + (2 * 1) / (12 * 5)
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1 + 2 / 60
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1 / 1 + 2 / 60
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(1 * 60) / (1 * 60) + 2 / 60
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60 / 60 + 2 / 60
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(60 + 2) / 60
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62 / 60
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"""
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try:
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yield from self._ancestor.explain()
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except AttributeError:
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yield self
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else:
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yield self
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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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