Mapytex/mapytex/calculus/core/operator.py

65 lines
1.6 KiB
Python

#! /usr/bin/env python
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
#
# Copyright © 2017 lafrite <lafrite@Poivre>
#
# Distributed under terms of the MIT license.
class OperatorError(Exception):
pass
OPERATORS = {
"+": {'repr': "+",
'arity': 2,
'precedence': 0,
'operate': lambda x: x.__getattribute__("__add__"),
'roperate': lambda x: x.__getattribute__("__radd__"),
},
"-": {'repr': "-",
'arity': 1,
'precedence': 1,
'operate': lambda x: x.__getattribute__("__neg__"),
},
"*": {'repr': "*",
'arity': 2,
'precedence': 2,
'operate': lambda x: x.__getattribute__("__mul__"),
'roperate': lambda x: x.__getattribute__("__rmul__"),
},
"/": {'repr': "/",
'arity': 2,
'precedence': 3,
'operate': lambda x: x.__getattribute__("__div__"),
'roperate': lambda x: x.__getattribute__("__rdiv__"),
},
"^": {'repr': "^",
'arity': 2,
'precedence': 4,
'operate': lambda x: x.__getattribute__("__pow__"),
'roperate': lambda x: x.__getattribute__("__rpow__"),
},
}
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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