const (
	iSuccess insertErr = -iota
	iShortDst
	iShortSrc
)

// insertFlush inserts the given rune in the buffer ordered by CCC.
// If a decomposition with multiple segments are encountered, they leading
// ones are flushed.
// It returns a non-zero error code if the rune was not inserted.
func (rb *reorderBuffer) insertFlush(src input, i int, info Properties) insertErr {
	if rune := src.hangul(i); rune != 0 {

		// TODO: this could be removed if we don't support merging.
		if rb.nrune > 0 {
			goto end
		}
	} else if s == ssOverflow {
		rb.insertCGJ()
		goto end
	}
	if err := rb.insertFlush(rb.src, sp, info); err != iSuccess {
		return int(err)
	}
	for {
		sp += int(info.size)
		if sp >= rb.nsrc {
			if !atEOF && !info.BoundaryAfter() {
				return int(iShortSrc)
			}
			break
		}

const (
	iSuccess insertErr = -iota
	iShortDst
	iShortSrc
)

// insertFlush inserts the given rune in the buffer ordered by CCC.
// If a decomposition with multiple segments are encountered, they leading
// ones are flushed.
// It returns a non-zero error code if the rune was not inserted.
func (rb *reorderBuffer) insertFlush(src input, i int, info Properties) insertErr {
	if rune := src.hangul(i); rune != 0 {

		// TODO: this could be removed if we don't support merging.
		if rb.nrune > 0 {
			goto end
		}
	} else if s == ssOverflow {
		rb.insertCGJ()
		goto end
	}
	if err := rb.insertFlush(rb.src, sp, info); err != iSuccess {
		return int(err)
	}
	for {
		sp += int(info.size)
		if sp >= rb.nsrc {
			if !atEOF && !info.BoundaryAfter() {
				return int(iShortSrc)
			}
			break
		}