protoMessageFieldIndexes function

List<int> protoMessageFieldIndexes(GeneratedMessage proto)

Returns the indexes (not tags!) of the message (i.e. non-primitive) fields that might be set.

Includes at most one value for each "oneOf".

The results are not sorted.

Implementation

List<int> protoMessageFieldIndexes(GeneratedMessage proto) {
  final metadata = _messageMetadata(proto);

  if (metadata.numOneOfFields == 0) {
    // No oneof fields - just return the non-oneof message field indexes.
    return metadata.nonOneOfMessageFieldIndexes;
  }

  final result = List<int>.from(metadata.nonOneOfMessageFieldIndexes);
  // Iterate over the oneof fields and add the indexes of the set fields to the
  // result.
  for (var i = 0; i < metadata.numOneOfFields; i++) {
    final tag = proto.$_whichOneof(i);
    if (tag != 0) {
      final index = metadata.tagToIndex[tag];
      if (index >= 0) {
        result.add(index);
      }
    }
  }
  return result;
}