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# re2py $INPUT -o $OUTPUT
from collections import namedtuple
SemVer = namedtuple('SemVer', 'major minor patch')
NONE = -1
def parse(yyinput):
yycursor = 0
%{
re2c:yyfill:enable = 0;
re2c:captvars = 1;
re2c:indent:top = 1;
num = [0-9]+;
(num) "." (num) ("." num)? [\x00] {
major = int(yyinput[yytl1:yytr1])
minor = int(yyinput[yytl2:yytr2])
patch = 0 if yytl3 == NONE else int(yyinput[yytl3 + 1:yytr3])
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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