Mapytex/mapytex/calculus/core/operator.py

#! /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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