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//go:generate re2go $INPUT -o $OUTPUT package main import "reflect" // Maximum number of capturing groups among all rules. /*!maxnmatch:re2c*/ type SemVer struct { major, minor, patch int } func s2n(s string) int { // convert pre-parsed string to a number n := 0 for _, c := range s { n = n*10 + int(c-'0') } return n } func parse(str string) *SemVer { var cur, mar int // Allocate memory for capturing parentheses (twice the number of groups). yypmatch := make([]int, YYMAXNMATCH*2) var yynmatch int // Autogenerated tag variables used by the lexer to track tag values. /*!stags:re2c format = '\tvar @@ int\n'; */ /*!re2c re2c:yyfill:enable = 0; re2c:define:YYCTYPE = byte; re2c:define:YYPEEK = "str[cur]"; re2c:define:YYSKIP = "cur += 1"; re2c:define:YYBACKUP = "mar = cur"; re2c:define:YYRESTORE = "cur = mar"; re2c:define:YYSTAGP = "@@{tag} = cur"; re2c:define:YYSTAGN = "@@{tag} = -1"; re2c:define:YYSHIFTSTAG = "@@{tag} += @@{shift}"; re2c:posix-captures = 1; num = [0-9]+; (num) "." (num) ("." num)? [\x00] { // `yynmatch` is the number of capturing groups if yynmatch != 4 { panic("expected 4 submatch groups") } // Even `yypmatch` values are for opening parentheses, odd values // are for closing parentheses, the first group is the whole match. major := s2n(str[yypmatch[2]:yypmatch[3]]) minor := s2n(str[yypmatch[4]:yypmatch[5]]) patch := 0 if yypmatch[6] != -1 { patch = s2n(str[yypmatch[6]+1:yypmatch[7]]) } return &SemVer{major, minor, patch} } * { return nil } */ } func main() { assert_eq := func(x, y *SemVer) { if !reflect.DeepEqual(x, y) { panic("error") } } assert_eq(parse("23.34\000"), &SemVer{23, 34, 0}) assert_eq(parse("1.2.9999\000"), &SemVer{1, 2, 9999}) assert_eq(parse("1.a\000"), nil) }