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# Copyright (c) 2018 Peter Pentchev <roam@ringlet.net>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
"""
Version string parsing for the feature-check Python library.
"""
import re
try:
from typing import Any, Callable, List, Optional, Tuple
_TYPING_USED = [Any, Callable, List, Optional, Tuple]
except ImportError:
_TYPING_USED = []
REX = {
'var': r'[A-Za-z0-9_-]+',
'value': r'[A-Za-z0-9.]+',
'op': r'(?: < | <= | = | >= | > | lt | le | eq | ge | gt )',
'num_alpha': r'(?P<num> [0-9]* ) (?P<alpha> .*)',
}
REX_COMP = {
name: re.compile(expr + '$', re.X) for name, expr in REX.items()
}
def _version_split_num_alpha(ver):
# type: (str) -> Tuple[str, str]
"""
Split a version component into a numeric and an alphanumeric part,
e.g. "2a" is split into ('2', 'a').
"""
match = REX_COMP['num_alpha'].match(ver)
assert match is not None
data = match.groupdict()
return data['num'], data['alpha']
def _version_compare_split_empty(spl_a, spl_b):
# type: (List[str], List[str]) -> Optional[int]
"""
Check if any of the split version numbers is empty.
"""
if not spl_a:
if not spl_b:
return 0
if _version_split_num_alpha(spl_b[0])[0] == '':
return 1
return -1
if not spl_b:
if _version_split_num_alpha(spl_a[0])[0] == '':
return -1
return 1
return None
def _version_compare_split_comp(comp_a, comp_b, conv):
# type: (str, str, Callable[[str], Any]) -> Optional[int]
"""
Compare a single component of split version numbers.
"""
if comp_a != '':
if comp_b != '':
if conv(comp_a) < conv(comp_b):
return -1
if conv(comp_a) > conv(comp_b):
return 1
else:
return 1
elif comp_b != '':
return -1
return None
def _version_compare_split(spl_a, spl_b):
# type: (List[str], List[str]) -> int
"""
Compare two version numbers already split into lists of version
number components.
Returns -1, 0, or 1 for the first version being less than, equal to,
or greater than the second one.
"""
res = _version_compare_split_empty(spl_a, spl_b)
if res is not None:
return res
(first_a, first_b) = (spl_a.pop(0), spl_b.pop(0))
(num_a, rem_a) = _version_split_num_alpha(first_a)
assert num_a != '' or rem_a != '', 'could not split ' + first_a
(num_b, rem_b) = _version_split_num_alpha(first_b)
assert num_b != '' or rem_b != '', 'could not split ' + first_b
res = _version_compare_split_comp(num_a, num_b, int)
if res is not None:
return res
res = _version_compare_split_comp(rem_a, rem_b, lambda s: s)
if res is not None:
return res
return _version_compare_split(spl_a, spl_b)
def version_compare(ver_a, ver_b):
# type: (str, str) -> int
"""
Compare two version numbers as strings.
Returns -1, 0, or 1 for the first version being less than, equal to,
or greater than the second one.
"""
return _version_compare_split(ver_a.split('.'), ver_b.split('.'))
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