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/* Generated by re2c */ #line 1 "c/submatch/03_posix.re" // re2c $INPUT -o $OUTPUT #include <assert.h> #include <stddef.h> // Maximum number of capturing groups among all rules. #line 9 "c/submatch/03_posix.c" #define YYMAXNMATCH 4 #line 6 "c/submatch/03_posix.re" 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. #line 31 "c/submatch/03_posix.c" const char *yyt1; const char *yyt2; const char *yyt3; const char *yyt4; const char *yyt5; #line 24 "c/submatch/03_posix.re" #line 41 "c/submatch/03_posix.c" { char yych; yych = *YYCURSOR; switch (yych) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': yyt1 = YYCURSOR; goto yy3; default: goto yy1; } yy1: ++YYCURSOR; yy2: #line 43 "c/submatch/03_posix.re" { return false; } #line 65 "c/submatch/03_posix.c" yy3: yych = *(YYMARKER = ++YYCURSOR); switch (yych) { case '.': goto yy4; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': goto yy6; default: goto yy2; } yy4: yych = *++YYCURSOR; switch (yych) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': yyt2 = YYCURSOR; goto yy7; default: goto yy5; } yy5: YYCURSOR = YYMARKER; goto yy2; yy6: yych = *++YYCURSOR; switch (yych) { case '.': goto yy4; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': goto yy6; default: goto yy5; } yy7: yych = *++YYCURSOR; switch (yych) { case 0x00: yyt4 = yyt5 = NULL; yyt3 = YYCURSOR; goto yy8; case '.': yyt3 = yyt5 = YYCURSOR; goto yy9; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': goto yy7; default: goto yy5; } yy8: ++YYCURSOR; yynmatch = 4; yypmatch[2] = yyt1; yypmatch[4] = yyt2; yypmatch[5] = yyt3; yypmatch[6] = yyt5; yypmatch[7] = yyt4; yypmatch[0] = yyt1; yypmatch[1] = YYCURSOR; yypmatch[3] = yyt2 - 1; #line 33 "c/submatch/03_posix.re" { // `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; } #line 162 "c/submatch/03_posix.c" yy9: yych = *++YYCURSOR; if (yych <= 0x00) goto yy5; goto yy11; yy10: yych = *++YYCURSOR; yy11: switch (yych) { case 0x00: yyt4 = YYCURSOR; goto yy8; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': goto yy10; default: goto yy5; } } #line 44 "c/submatch/03_posix.re" } 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; }