Function findLabelSpecs

hcldec/spec.go:1386–1422

(spec Spec)

}

func findLabelSpecs(spec Spec) []string {
	maxIdx := -1
	var names map[int]string

	var visit visitFunc
	visit = func(s Spec) {
		if ls, ok := s.(*BlockLabelSpec); ok {
			if maxIdx < ls.Index {
				maxIdx = ls.Index
			}
			if names == nil {
				names = make(map[int]string)
			}
			names[ls.Index] = ls.Name
		}
		s.visitSameBodyChildren(visit)
	}

	visit(spec)

	if maxIdx < 0 {
		return nil // no labels at all
	}

	ret := make([]string, maxIdx+1)
	for i := range ret {
		name := names[i]
		if name == "" {
			// Should never happen if the spec is conformant, since we require
			// consecutive indices starting at zero.
			name = fmt.Sprintf("missing%02d", i)
		}
		ret[i] = name
	}

	return ret
}

// DefaultSpec is a spec that wraps two specs, evaluating the primary first
// and then evaluating the default if the primary returns a null value.