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// re2c $INPUT -o $OUTPUT #include <assert.h> #include <stddef.h> // Maximum number of capturing groups among all rules. /*!maxnmatch:re2c*/ struct SemVer { int major, minor, patch; }; static int s2n(const char *s, const char *e) { // pre-parsed string to number int n = 0; for (; s < e; ++s) n = n * 10 + (*s - '0'); return n; } static bool lex(const char *str, SemVer &ver) { const char *YYCURSOR = str, *YYMARKER; // Allocate memory for capturing parentheses (twice the number of groups). const char *yypmatch[YYMAXNMATCH * 2]; size_t yynmatch; // Autogenerated tag variables used by the lexer to track tag values. /*!stags:re2c format = 'const char *@@;\n'; */ /*!re2c re2c:yyfill:enable = 0; re2c:define:YYCTYPE = char; re2c:posix-captures = 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. ver.major = s2n(yypmatch[2], yypmatch[3]); ver.minor = s2n(yypmatch[4], yypmatch[5]); ver.patch = yypmatch[6] ? s2n(yypmatch[6] + 1, yypmatch[7]) : 0; return true; } * { return false; } */ } int main() { SemVer v; assert(lex("23.34", v) && v.major == 23 && v.minor == 34 && v.patch == 0); assert(lex("1.2.999", v) && v.major == 1 && v.minor == 2 && v.patch == 999); assert(!lex("1.a", v)); return 0; }