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| # Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license | |
| # Copyright (C) 2012-2017 Nominum, Inc. | |
| # | |
| # Permission to use, copy, modify, and distribute this software and its | |
| # documentation for any purpose with or without fee is hereby granted, | |
| # provided that the above copyright notice and this permission notice | |
| # appear in all copies. | |
| # | |
| # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES | |
| # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
| # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR | |
| # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
| # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| """DNS GENERATE range conversion.""" | |
| from typing import Tuple | |
| import dns | |
| def from_text(text: str) -> Tuple[int, int, int]: | |
| """Convert the text form of a range in a ``$GENERATE`` statement to an | |
| integer. | |
| *text*, a ``str``, the textual range in ``$GENERATE`` form. | |
| Returns a tuple of three ``int`` values ``(start, stop, step)``. | |
| """ | |
| start = -1 | |
| stop = -1 | |
| step = 1 | |
| cur = "" | |
| state = 0 | |
| # state 0 1 2 | |
| # x - y / z | |
| if text and text[0] == "-": | |
| raise dns.exception.SyntaxError("Start cannot be a negative number") | |
| for c in text: | |
| if c == "-" and state == 0: | |
| start = int(cur) | |
| cur = "" | |
| state = 1 | |
| elif c == "/": | |
| stop = int(cur) | |
| cur = "" | |
| state = 2 | |
| elif c.isdigit(): | |
| cur += c | |
| else: | |
| raise dns.exception.SyntaxError("Could not parse %s" % (c)) | |
| if state == 0: | |
| raise dns.exception.SyntaxError("no stop value specified") | |
| elif state == 1: | |
| stop = int(cur) | |
| else: | |
| assert state == 2 | |
| step = int(cur) | |
| assert step >= 1 | |
| assert start >= 0 | |
| if start > stop: | |
| raise dns.exception.SyntaxError("start must be <= stop") | |
| return (start, stop, step) | |