parseNode method

Map<String, dynamic>? parseNode(dynamic reader, dynamic version)

Implementation

Map<String, dynamic>? parseNode(reader, version) {
  Map<String, dynamic> node = {};

  // The first three data sizes depends on version.
  var endOffset = (version >= 7500) ? reader.getUint64() : reader.getUint32();
  var numProperties =
      (version >= 7500) ? reader.getUint64() : reader.getUint32();

  (version >= 7500)
      ? reader.getUint64()
      : reader.getUint32(); // the returned propertyListLen is not used

  var nameLen = reader.getUint8();
  var name = reader.getString(nameLen);

  // Regards this node as NULL-record if endOffset is zero
  if (endOffset == 0) return null;

  var propertyList = [];

  for (var i = 0; i < numProperties; i++) {
    propertyList.add(this.parseProperty(reader));
  }

  // Regards the first three elements in propertyList as id, attrName, and attrType
  var id = propertyList.length > 0 ? propertyList[0] : '';
  var attrName = propertyList.length > 1 ? propertyList[1] : '';
  var attrType = propertyList.length > 2 ? propertyList[2] : '';

  // check if this node represents just a single property
  // like (name, 0) set or (name2, [0, 1, 2]) set of {name: 0, name2: [0, 1, 2]}
  node["singleProperty"] =
      (numProperties == 1 && reader.getOffset() == endOffset) ? true : false;

  while (endOffset > reader.getOffset()) {
    var subNode = this.parseNode(reader, version);

    if (subNode != null) this.parseSubNode(name, node, subNode);
  }

  node["propertyList"] = propertyList; // raw property list used by parent

  if (id is num) node["id"] = id;
  if (attrName != '') node["attrName"] = attrName;
  if (attrType != '') node["attrType"] = attrType;
  if (name != '') node["name"] = name;

  return node;
}