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package textseg
import "unicode/utf8"
// ScanGraphemeClusters is a split function for bufio.Scanner that splits
// on UTF8 sequence boundaries.
//
// This is included largely for completeness, since this behavior is already
// built in to Go when ranging over a string.
func ScanUTF8Sequences(data []byte, atEOF bool) (int, []byte, error) {
if len(data) == 0 {
return 0, nil, nil
}
r, seqLen := utf8.DecodeRune(data)
if r == utf8.RuneError && !atEOF {
return 0, nil, nil
}
return seqLen, data[:seqLen], nil
}
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