deserialize method

@override void deserialize(HtmlExternalScannerState state, Uint8List data)

Implementation

@override
void deserialize(HtmlExternalScannerState state, Uint8List data) {
  state._tags.clear();
  if (data.isEmpty) return;
  if (data.length < 4) {
    throw const FormatException('Truncated HTML external-scanner state');
  }

  final bytes = ByteData.sublistView(data);
  final serializedTagCount = bytes.getUint16(0, Endian.host);
  final tagCount = bytes.getUint16(2, Endian.host);
  if (serializedTagCount > tagCount) {
    throw const FormatException('Invalid HTML external-scanner tag counts');
  }

  var offset = 4;
  for (var index = 0; index < serializedTagCount; index++) {
    if (offset >= data.length) {
      throw const FormatException('Truncated HTML external-scanner tag');
    }
    final type = data[offset++];
    if (type == _custom) {
      if (offset >= data.length) {
        throw const FormatException(
          'Truncated HTML external-scanner custom tag',
        );
      }
      final nameLength = data[offset++];
      if (offset + nameLength > data.length) {
        throw const FormatException(
          'Truncated HTML external-scanner custom tag name',
        );
      }
      state._tags.add(
        _HtmlTag(
          type,
          utf8.decode(data.sublist(offset, offset + nameLength)),
        ),
      );
      offset += nameLength;
    } else {
      state._tags.add(_HtmlTag(type, ''));
    }
  }
  // Upstream resizes the vector before restoring the serialized prefix. Any
  // suffix that did not fit in Tree-sitter's buffer receives Tag's default
  // END_OF_VOID_TAGS value.
  while (state._tags.length < tagCount) {
    state._tags.add(const _HtmlTag(_endOfVoidTags, ''));
  }
}