return copy(buf, in.bytes[b:e])
}

func (in *input) charinfoNFC(p int) (uint16, int) {
	if in.bytes == nil {
		return nfcData.lookupString(in.str[p:])
	}
	return nfcData.lookup(in.bytes[p:])
}

func (in *input) charinfoNFKC(p int) (uint16, int) {
	if in.bytes == nil {
		return nfkcData.lookupString(in.str[p:])
	}
	return nfkcData.lookup(in.bytes[p:])
}

func (in *input) hangul(p int) (r rune) {
	var size int

	return copy(buf, in.bytes[b:e])
}

func (in *input) charinfoNFC(p int) (uint16, int) {
	if in.bytes == nil {
		return nfcData.lookupString(in.str[p:])
	}
	return nfcData.lookup(in.bytes[p:])
}

func (in *input) charinfoNFKC(p int) (uint16, int) {
	if in.bytes == nil {
		return nfkcData.lookupString(in.str[p:])
	}
	return nfkcData.lookup(in.bytes[p:])
}

func (in *input) hangul(p int) (r rune) {
	var size int

		return Properties{entry: trie.lookupValue(uint32(i), c3)}, 4
	}
	// Illegal rune
	return Properties{}, 1
}

// LookupString returns properties for the first rune in s and the width in
// bytes of its encoding. The size will be 0 if s does not hold enough bytes to
// complete the encoding.
func LookupString(s string) (p Properties, sz int) {
	c0 := s[0]
	switch {
	case c0 < 0x80: // is ASCII

}

func validateRegistration(p *Profile, s string) (string, error) {
	if !norm.NFC.IsNormalString(s) {
		return s, &labelError{s, "V1"}
	}
	for i := 0; i < len(s); {
		v, sz := trie.lookupString(s[i:])
		// Copy bytes not copied so far.
		switch p.simplify(info(v).category()) {
		// TODO: handle the NV8 defined in the Unicode idna data set to allow
		// for strict conformance to IDNA2008.

	// TODO: filter need for normalization in loop below.
	if !norm.NFC.IsNormalString(s) {
		return s, false, &labelError{s, "V1"}
	}
	for i := 0; i < len(s); {
		v, sz := trie.lookupString(s[i:])
		if sz == 0 {
			return s, bidi, runeError(utf8.RuneError)
		}
		bidi = bidi || info(v).isBidi(s[i:])
		// Copy bytes not copied so far.
		switch p.simplify(info(v).category()) {

}

// PropertiesString returns properties for the first rune in s.
func (f Form) PropertiesString(s string) Properties {
	if f == NFC || f == NFD {
		return compInfo(nfcData.lookupString(s))
	}
	return compInfo(nfkcData.lookupString(s))
}

// compInfo converts the information contained in v and sz
// to a Properties.  See the comment at the top of the file
// for more information on the format.

}

// PropertiesString returns properties for the first rune in s.
func (f Form) PropertiesString(s string) Properties {
	if f == NFC || f == NFD {
		return compInfo(nfcData.lookupString(s))
	}
	return compInfo(nfkcData.lookupString(s))
}

// compInfo converts the information contained in v and sz
// to a Properties.  See the comment at the top of the file
// for more information on the format.

// 5893. The Bidi Rule does not have to be applied to labels of the category
// LeftToRight.
func DirectionString(s string) bidi.Direction {
	for i := 0; i < len(s); {
		e, sz := bidi.LookupString(s[i:])
		if sz == 0 {
			i++
			continue
		}
		c := e.Class()
		if c == bidi.R || c == bidi.AL || c == bidi.AN {
			return bidi.RightToLeft
		}
		i += sz
	}
	return bidi.LeftToRight

		return t.lookupValue(uint32(i), s[3])
	}
	return 0
}

// lookupString returns the trie value for the first UTF-8 encoding in s and
// the width in bytes of this encoding. The size will be 0 if s does not
// hold enough bytes to complete the encoding. len(s) must be greater than 0.
func (t *caseTrie) lookupString(s string) (v uint16, sz int) {
	c0 := s[0]
	switch {
	case c0 < 0x80: // is ASCII

		return t.lookupValue(uint32(i), s[3])
	}
	return 0
}

// lookupString returns the trie value for the first UTF-8 encoding in s and
// the width in bytes of this encoding. The size will be 0 if s does not
// hold enough bytes to complete the encoding. len(s) must be greater than 0.
func (t *caseTrie) lookupString(s string) (v uint16, sz int) {
	c0 := s[0]
	switch {
	case c0 < 0x80: // is ASCII