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//go:generate re2go $INPUT -o $OUTPUT
package main
// Returns "fake" terminating null if cursor has reached limit.
func peek(str string, cur int) byte {
if cur >= len(str) {
return 0 // fake null
} else {
return str[cur]
}
}
// Expects a string without terminating null.
func lex(str string) int {
var cur int
count := 0
for { /*!re2c
re2c:yyfill:enable = 0;
re2c:define:YYCTYPE = byte;
re2c:define:YYPEEK = "peek(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(""), 0)
assert_eq(lex("one two three"), 3)
assert_eq(lex("f0ur"), -1)
}