Mapytex/mapytex/calculus/core/renders/tree2txt.py

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#! /usr/bin/env python
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
#
# Copyright © 2017 lafrite <lafrite@Poivre>
#
# Distributed under terms of the MIT license.
from ..operator import OPERATORS
__all__ = ['tree2txt']
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def plus2txt(left, right):
""" + rendering
>>> from ..MO import MO
>>> plus2txt(MO.factory(2), MO.factory(3))
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'2 + 3'
>>> from ..tree import Tree
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>>> t = Tree.from_str("1+2")
>>> plus2txt(t, MO.factory(3))
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'1 + 2 + 3'
>>> plus2txt(t, MO.factory(-3))
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'1 + 2 - 3'
>>> plus2txt(MO.factory(-3), t)
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'- 3 + 1 + 2'
>>> t = Tree.from_str("-2*3")
>>> plus2txt(MO.factory(3), t)
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'3 - 2 * 3'
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"""
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left_ = render_with_parenthesis(left, "+")
right_ = render_with_parenthesis(right, "+")
display_plus = True
if right_.startswith("-"):
display_plus = False
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if display_plus:
return f"{left_} + {right_}"
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return f"{left_} {right_}"
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def minus2txt(left, right):
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""" - rendering
>>> from ..MO import MO
>>> minus2txt(None, MO.factory(3))
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'- 3'
>>> from ..tree import Tree
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>>> t = Tree.from_str("1+2")
>>> minus2txt(None, t)
'- (1 + 2)'
"""
try:
right_need_parenthesis = False
if OPERATORS[right.node]["precedence"] < OPERATORS['-']["precedence"]:
right_need_parenthesis = True
except AttributeError:
right_ = right.__txt__
else:
if right_need_parenthesis:
right_ = f"({tree2txt(right)})"
else:
right_ = tree2txt(right)
return f"- {right_}"
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def mul2txt(left, right):
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""" * rendering
>>> from ..MO import MO
>>> mul2txt(MO.factory(2), MO.factory(3))
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'2 * 3'
>>> from ..tree import Tree
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>>> t = Tree.from_str("1*2")
>>> mul2txt(t, MO.factory(3))
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'1 * 2 * 3'
>>> t = Tree.from_str("1+2")
>>> mul2txt(t, MO.factory(3))
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'(1 + 2) * 3'
>>> mul2txt(MO.factory(3), t)
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'3(1 + 2)'
>>> a = MO.factory('x')
>>> mul2txt(MO.factory(3), a)
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'3x'
>>> mul2txt(a, a)
'x * x'
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"""
display_time = True
left_ = render_with_parenthesis(left, "*")
right_ = render_with_parenthesis(right, "*")
if (right_[0].isalpha() and (left_.isnumeric() or left_.isdecimal())) or \
right_[0] == '(':
display_time = False
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if display_time:
return f"{left_} * {right_}"
else:
return f"{left_}{right_}"
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def div2txt(left, right):
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""" / rendering
>>> from ..MO import MO
>>> div2txt(MO.factory(2), MO.factory(3))
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'2 / 3'
>>> from ..tree import Tree
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>>> t = Tree.from_str("1/2")
>>> div2txt(t, MO.factory(3))
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'1 / 2 / 3'
>>> t = Tree.from_str("1+2")
>>> div2txt(t, MO.factory(3))
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'(1 + 2) / 3'
>>> t = Tree.from_str("1*2")
>>> div2txt(MO.factory(3), t)
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'3 / (1 * 2)'
"""
try:
left_need_parenthesis = False
if OPERATORS[left.node]["precedence"] < OPERATORS['/']["precedence"]:
left_need_parenthesis = True
except AttributeError:
left_ = left.__txt__
else:
if left_need_parenthesis:
left_ = f"({tree2txt(left)})"
else:
left_ = tree2txt(left)
try:
right_need_parenthesis = False
if OPERATORS[right.node]["precedence"] < OPERATORS['/']["precedence"]:
right_need_parenthesis = True
except AttributeError:
right_ = right.__txt__
else:
if right_need_parenthesis:
right_ = f"({tree2txt(right)})"
else:
right_ = tree2txt(right)
return f"{left_} / {right_}"
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def pow2txt(left, right):
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""" ^ rendering
>>> from ..MO import MO
>>> pow2txt(MO.factory(2), MO.factory(3))
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'2^3'
>>> from ..tree import Tree
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>>> t = Tree.from_str("1^2")
>>> pow2txt(t, MO.factory(3))
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'1^2^3'
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>>> t = Tree.from_str("1+2")
>>> pow2txt(t, MO.factory(3))
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'(1 + 2)^3'
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>>> t = Tree.from_str("1*2")
>>> pow2txt(MO.factory(3), t)
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'3^(1 * 2)'
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"""
left_ = render_with_parenthesis(left, "^")
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try:
right_need_parenthesis = False
if OPERATORS[right.node]["precedence"] < OPERATORS['^']["precedence"]:
right_need_parenthesis = True
except AttributeError:
right_ = right.__txt__
else:
if right_need_parenthesis:
right_ = f"({tree2txt(right)})"
else:
right_ = tree2txt(right)
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return f"{left_}^{right_}"
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def render_with_parenthesis(subtree, operator):
subtree_need_parenthesis = False
try:
subtree.node
except AttributeError:
try:
if OPERATORS[subtree.MAINOP]["precedence"] < OPERATORS[operator]["precedence"]:
subtree_need_parenthesis = True
except (AttributeError, KeyError):
pass
subtree_ = subtree.__txt__
else:
if OPERATORS[subtree.node]["precedence"] < OPERATORS[operator]["precedence"]:
subtree_need_parenthesis = True
subtree_ = tree2txt(subtree)
if subtree_need_parenthesis:
return f"({subtree_})"
return subtree_
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OPERATOR2TXT = {
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"+": plus2txt,
"-": minus2txt,
"*": mul2txt,
"/": div2txt,
"^": pow2txt,
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}
def tree2txt(tree):
""" Convert a tree into its txt version
It calls __txt__ to render MOs.
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:param tree: tree to render
:example:
>>> from ..tree import Tree
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>>> t = Tree.from_str("2+3*4")
>>> tree2txt(t)
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'2 + 3 * 4'
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"""
from ..tree import Tree
if not isinstance(tree, Tree):
raise ValueError(f"Can only render a Tree (got {type(tree).__name__}: {tree})")
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return OPERATOR2TXT[tree.node](tree.left_value, tree.right_value)
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# -----------------------------
# Reglages pour 'vim'
# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
# cursor: 16 del