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Filename : unicode_identifier.re

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//go:generate re2go $INPUT -o $OUTPUT -8 -s -i
package main

/*!include:re2c "unicode_categories.re" */

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";

		// Simplified "Unicode Identifier and Pattern Syntax"
		// (see https://unicode.org/reports/tr31)
		id_start    = L | Nl | [$_];
		id_continue = id_start | Mn | Mc | Nd | Pc | [\u200D\u05F3];
		identifier  = id_start id_continue*;

		identifier { return 0 }
		*          { return 1 }
	*/
}

func main() {
	if lex("_Ыдентификатор\000") != 0 {
		panic("error")
	}
}