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# re2py $INPUT -o $OUTPUT
from collections import namedtuple
SemVer = namedtuple('SemVer', 'major minor patch')
# Maximum number of capturing groups among all rules.
%{maxnmatch %}
NONE = -1
def parse(yyinput):
yycursor = 0
# A list for capturing parentheses (twice the number of groups).
yypmatch = [None] * (YYMAXNMATCH * 2)
%{
re2c:yyfill:enable = 0;
re2c:posix-captures = 1;
re2c:indent:top = 1;
num = [0-9]+;
(num) "." (num) ("." num)? [\x00] {
# `yynmatch` is the number of capturing groups
assert yynmatch == 4
# Even `yypmatch` values are for opening parentheses, odd values
# are for closing parentheses, the first group is the whole match.
major = int(yyinput[yypmatch[2]:yypmatch[3]])
minor = int(yyinput[yypmatch[4]:yypmatch[5]])
patch = 0 if yypmatch[6] == NONE else int(yyinput[yypmatch[6] + 1:yypmatch[7]])
return SemVer(major, minor, patch)
}
* { return None }
%}
assert parse(b"23.34\0") == SemVer(23, 34, 0)
assert parse(b"1.2.99999\0") == SemVer(1, 2, 99999)
assert parse(b"1.a\0") == None
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