resolveReference method

TreeElement? resolveReference(TreeReference ref)

The element ref points to, or null if it doesn't exist or is ambiguous. Never returns the hidden base node.

Implementation

TreeElement? resolveReference(TreeReference ref) {
  if (!ref.isAbsolute) return null;
  TreeElement? node = base;
  TreeElement? result;
  for (var i = 0; i < ref.size; i++) {
    final name = ref.nameAt(i);
    var multiplicity = ref.multiplicityAt(i);
    if (multiplicity == TreeReference.indexAttribute) {
      node = result = node!.getAttribute(null, name);
      continue;
    }
    if (multiplicity == TreeReference.indexUnbound) {
      if (node!.childMultiplicity(name) == 1) {
        multiplicity = 0;
      } else {
        node = result = null;
        break;
      }
    }
    node = result = node!.getChild(name, multiplicity);
    if (node == null) break;
  }
  if (identical(node, base) || result == null) return null;
  if (result.isPartial) throw PartialElementEncounteredException();
  return result;
}