Mapytex/mapytex/calculus/core/operator.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.
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class OperatorError(Exception):
pass
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OPERATORS = {
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"+": {'repr': "+",
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'arity': 2,
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'precedence': 0,
'operate': lambda x: x.__getattribute__("__add__"),
'roperate': lambda x: x.__getattribute__("__radd__"),
},
"-": {'repr': "-",
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'arity': 1,
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'precedence': 1,
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'operate': lambda x: x.__getattribute__("__neg__"),
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},
"*": {'repr': "*",
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'arity': 2,
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'precedence': 2,
'operate': lambda x: x.__getattribute__("__mul__"),
'roperate': lambda x: x.__getattribute__("__rmul__"),
},
"/": {'repr': "/",
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'arity': 2,
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'precedence': 3,
'operate': lambda x: x.__getattribute__("__div__"),
'roperate': lambda x: x.__getattribute__("__rdiv__"),
},
"^": {'repr': "^",
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'arity': 2,
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'precedence': 4,
'operate': lambda x: x.__getattribute__("__pow__"),
'roperate': lambda x: x.__getattribute__("__rpow__"),
},
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}
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def is_operator(string):
""" Return whether a string is an operator or not
:param string: string to test
:returns: boolean
:example:
>>> is_operator("+")
True
>>> is_operator("i")
False
"""
return string in OPERATORS.keys()
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# cursor: 16 del