58 lines
1.1 KiB
Python
58 lines
1.1 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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__all__ = ["OperatorError", "OPERATORS", "is_operator"]
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class OperatorError(Exception):
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pass
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OPERATORS = {
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"+": {'repr': "+",
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'arity': 2,
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'precedence': 0,
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},
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"-": {'repr': "-",
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'arity': 1,
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'precedence': 1,
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},
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"*": {'repr': "*",
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'arity': 2,
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'precedence': 2,
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},
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"/": {'repr': "/",
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'arity': 2,
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'precedence': 3,
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},
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"^": {'repr': "^",
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'arity': 2,
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'precedence': 4,
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},
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}
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def is_operator(string):
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""" Return whether a string is an operator or not
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:param string: string to test
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:returns: boolean
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:example:
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>>> is_operator("+")
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True
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>>> is_operator("i")
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False
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"""
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return string in OPERATORS.keys()
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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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