}

// Definition BD13. Determine isolating run sequences.
func (p *paragraph) determineIsolatingRunSequences() []*isolatingRunSequence {
	levelRuns := p.determineLevelRuns()

	// Compute the run that each character belongs to
	runForCharacter := make([]int, p.Len())
	for i, run := range levelRuns {
		for _, index := range run {
			runForCharacter[index] = i
		}
	}

	sequences := []*isolatingRunSequence{}

// The following option may be a way to expose this functionality in this API.
// // LevelFunc sets a function that associates nesting levels with the given text.
// // The levels function will be called with monotonically increasing values for p.
// func LevelFunc(levels func(p int) int) Option {
// 	panic("unimplemented")
// }