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//go:generate re2go $INPUT -o $OUTPUT --input-encoding utf8 package main // This example supports multiple input encodings: UTF-8 and UTF-32. // Both lexers are generated from the same rules block, and the use // blocks add only encoding-specific configurations. /*!rules:re2c re2c:yyfill:enable = 0; re2c:define:YYPEEK = "str[cur]"; re2c:define:YYSKIP = "cur += 1"; re2c:define:YYBACKUP = "mar = cur"; re2c:define:YYRESTORE = "cur = mar"; "∀x ∃y" { return 0; } * { return 1; } */ func lexUTF8(str []uint8) int { var cur, mar int /*!use:re2c re2c:encoding:utf8 = 1; re2c:define:YYCTYPE = uint8; */ } func lexUTF32(str []uint32) int { var cur, mar int /*!use:re2c re2c:encoding:utf32 = 1; re2c:define:YYCTYPE = uint32; */ } func main() { assert_eq := func(x, y int) { if x != y { panic("error") } } assert_eq(lexUTF8([]uint8{0xe2, 0x88, 0x80, 0x78, 0x20, 0xe2, 0x88, 0x83, 0x79}), 0) assert_eq(lexUTF32([]uint32{0x2200, 0x78, 0x20, 0x2203, 0x79}), 0) }