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Edit File: 01_sentinel.re
//go:generate re2go $INPUT -o $OUTPUT package main // Expect a null-terminated string. func lex(str string) int { var cur int count := 0 for { /*!re2c re2c:yyfill:enable = 0; re2c:define:YYCTYPE = byte; re2c:define:YYPEEK = "str[cur]"; re2c:define:YYSKIP = "cur += 1"; * { return -1 } [\x00] { return count } [a-z]+ { count += 1; continue } [ ]+ { continue } */ } } func main() { assert_eq := func(x, y int) { if x != y { panic("error") } } assert_eq(lex("\000"), 0) assert_eq(lex("one two three\000"), 3) assert_eq(lex("f0ur\000"), -1) }
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