codekingpro/portable-devtools

1# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license2 3# Copyright (C) 2012-2017 Nominum, Inc.4#5# Permission to use, copy, modify, and distribute this software and its6# documentation for any purpose with or without fee is hereby granted,7# provided that the above copyright notice and this permission notice8# appear in all copies.9#10# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES11# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF12# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR13# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES14# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN15# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT16# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.17 18"""DNS GENERATE range conversion."""19 20from typing import Tuple21 22import dns23 24 25def from_text(text: str) -> Tuple[int, int, int]:26    """Convert the text form of a range in a ``$GENERATE`` statement to an27    integer.28 29    *text*, a ``str``, the textual range in ``$GENERATE`` form.30 31    Returns a tuple of three ``int`` values ``(start, stop, step)``.32    """33 34    start = -135    stop = -136    step = 137    cur = ""38    state = 039    # state   0   1   240    #         x - y / z41 42    if text and text[0] == "-":43        raise dns.exception.SyntaxError("Start cannot be a negative number")44 45    for c in text:46        if c == "-" and state == 0:47            start = int(cur)48            cur = ""49            state = 150        elif c == "/":51            stop = int(cur)52            cur = ""53            state = 254        elif c.isdigit():55            cur += c56        else:57            raise dns.exception.SyntaxError("Could not parse %s" % (c))58 59    if state == 0:60        raise dns.exception.SyntaxError("no stop value specified")61    elif state == 1:62        stop = int(cur)63    else:64        assert state == 265        step = int(cur)66 67    assert step >= 168    assert start >= 069    if start > stop:70        raise dns.exception.SyntaxError("start must be <= stop")71 72    return (start, stop, step)73