Function stringFixedDistanceSetFilter

stringprefixfilter.go:98–126

(set syntax.FixedDistanceSet, minRequiredLength int)

}

func stringFixedDistanceSetFilter(set syntax.FixedDistanceSet, minRequiredLength int) StringPrefixFilter {
	scanner, ok := newASCIISetStringScanner(set)
	if !ok {
		return nil
	}

	return func(input string, startAt int) (candidateByteIndex int, ok bool) {
		if !hasMinRequiredBytes(input, startAt, minRequiredLength) {
			return 0, false
		}

		for searchAt := startAt; searchAt < len(input); {
			offset := scanner.index(input[searchAt:])
			if offset < 0 {
				return 0, false
			}
			setByteIndex := searchAt + offset
			candidateByteIndex, valid := stringFixedDistanceCandidateStart(input, startAt, setByteIndex, scanner.distance)
			if valid && hasMinRequiredBytes(input, candidateByteIndex, minRequiredLength) {
				return candidateByteIndex, true
			}
			if valid {
				return 0, false
			}
			searchAt = setByteIndex + 1
		}
		return 0, false
	}
}

func (s asciiSetStringScanner) index(input string) int {
	if !s.useRange {