return Ordering{}, nil
	}

	for _, fn := range p.opts {
		fn(&p.options)
	}
	lvl := level(-1)
	if p.options.defaultDirection == RightToLeft {
		lvl = 1
	}
	para, err := newParagraph(p.types, p.pairTypes, p.pairValues, lvl)
	if err != nil {
		return Ordering{}, err
	}

	levels := para.getLevels([]int{len(p.types)})

	p.o = calculateOrdering(levels, p.runes)
	return p.o, nil
}

	// characters, and for PDIs with no matching isolate initiator, the value of
	// matchingIsolateInitiator will be set to -1.
	matchingIsolateInitiator []int
}

// newParagraph initializes a paragraph. The user needs to supply a few arrays
// corresponding to the preprocessed text input. The types correspond to the
// Unicode BiDi classes for each rune. pairTypes indicates the bracket type for