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70 lines
2.0 KiB
Python
70 lines
2.0 KiB
Python
5 years ago
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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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# Copyright (C) 2012-2017 Nominum, Inc.
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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"""DNS GENERATE range conversion."""
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import dns
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def from_text(text):
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"""Convert the text form of a range in a ``$GENERATE`` statement to an
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integer.
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*text*, a ``str``, the textual range in ``$GENERATE`` form.
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Returns a tuple of three ``int`` values ``(start, stop, step)``.
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"""
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# TODO, figure out the bounds on start, stop and step.
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step = 1
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cur = ''
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state = 0
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# state 0 1 2 3 4
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# x - y / z
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if text and text[0] == '-':
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raise dns.exception.SyntaxError("Start cannot be a negative number")
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for c in text:
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if c == '-' and state == 0:
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start = int(cur)
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cur = ''
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state = 2
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elif c == '/':
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stop = int(cur)
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cur = ''
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state = 4
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elif c.isdigit():
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cur += c
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else:
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raise dns.exception.SyntaxError("Could not parse %s" % (c))
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if state in (1, 3):
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raise dns.exception.SyntaxError()
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if state == 2:
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stop = int(cur)
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if state == 4:
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step = int(cur)
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assert step >= 1
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assert start >= 0
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assert start <= stop
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# TODO, can start == stop?
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return (start, stop, step)
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