// re2c $INPUT -o $OUTPUT // This example shows how to combine reusable re2c blocks: two blocks // ('colors' and 'fish') are merged into one. The 'salmon' rule occurs // in both blocks; the 'fish' block takes priority because it is used // earlier. Default rule * occurs in all three blocks; the local (not // inherited) definition takes priority. #include <assert.h> enum What { COLOR, FISH, DUNNO }; /*!rules:re2c:colors * { assert(false); } "red" | "salmon" | "magenta" { return COLOR; } */ /*!rules:re2c:fish * { assert(false); } "haddock" | "salmon" | "eel" { return FISH; } */ static What lex(const char *YYCURSOR) { const char *YYMARKER; /*!re2c re2c:yyfill:enable = 0; re2c:define:YYCTYPE = char; !use:fish; !use:colors; * { return DUNNO; } */ } int main() { assert(lex("salmon") == FISH); assert(lex("what?") == DUNNO); return 0; }