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Edit File: usedir.re
//go:generate re2go $INPUT -o $OUTPUT package main // 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. 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 cur, mar int /*!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"; !use:fish; !use:colors; * { return Dunno } // overrides inherited '*' rules */ } func main() { assert_eq := func(x, y int) { if x != y { panic("error") } } assert_eq(lex("salmon"), Fish); assert_eq(lex("what?"), Dunno); }
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