//go:generate re2go $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. package main import "testing" const ( Color = iota Fish Dunno ) /*!rules:re2c:colors * { panic("eh!") } "red" | "salmon" | "magenta" { return Color } */ /*!rules:re2c:fish * { panic("oh!") } "haddock" | "salmon" | "eel" { return Fish } */ func lex(str string) int { var cursor, marker int /*!re2c re2c:yyfill:enable = 0; re2c:define:YYCTYPE = byte; re2c:define:YYPEEK = "str[cursor]"; re2c:define:YYSKIP = "cursor += 1"; re2c:define:YYBACKUP = "marker = cursor"; re2c:define:YYRESTORE = "cursor = marker"; !use:fish; !use:colors; * { return Dunno } */ } func TestLex(t *testing.T) { if lex("salmon") != Fish || lex("what?") != Dunno { t.Errorf("lex failed") } }