parseObject function

ValueIndex<ObjectNode>? parseObject(dynamic input, List<Token> tokenList, int index, Settings settings,)

Implementation

ValueIndex<ObjectNode>? parseObject(
    input, List<Token> tokenList, int index, Settings settings) {
  // object: LEFT_BRACE (property (COMMA property)*)? RIGHT_BRACE
  late Token startToken;
  final object = new ObjectNode();
  _ObjectState state = _ObjectState._START_;

  while (index < tokenList.length) {
    final token = tokenList[index];

    switch (state) {
      case _ObjectState._START_:
        {
          if (token.type == TokenType.LEFT_BRACE) {
            startToken = token;
            state = _ObjectState.OPEN_OBJECT;
            index++;
          } else {
            return null;
          }
          break;
        }

      case _ObjectState.OPEN_OBJECT:
        {
          if (token.type == TokenType.RIGHT_BRACE) {
            if (settings.loc) {
              final src = settings.source ?? "";
              object.loc = Location.create(
                  startToken.loc!.start.line,
                  startToken.loc!.start.column,
                  startToken.loc!.start.offset,
                  token.loc!.end.line,
                  token.loc!.end.column,
                  token.loc!.end.offset,
                  src);
            }
            return new ValueIndex(object, index + 1);
          } else {
            final property = parseProperty(input, tokenList, index, settings);
            if (property != null) {
              object.children.add(property.value);
              state = _ObjectState.PROPERTY;
              index = property.index;
            } else {
              final src = settings.source ?? "";
              final msg = unexpectedToken(
                  substring(
                      input, token.loc!.start.offset, token.loc!.end.offset),
                  src,
                  token.loc!.start.line,
                  token.loc!.start.column);
              throw new JSONASTException(msg, input, src, token.loc!.start.line,
                  token.loc!.start.column);
            }
          }
          break;
        }

      case _ObjectState.PROPERTY:
        {
          if (token.type == TokenType.RIGHT_BRACE) {
            if (settings.loc != null) {
              final src = settings.source ?? "";
              object.loc = Location.create(
                  startToken.loc!.start.line,
                  startToken.loc!.start.column,
                  startToken.loc!.start.offset,
                  token.loc!.end.line,
                  token.loc!.end.column,
                  token.loc!.end.offset,
                  src);
            }
            return new ValueIndex(object, index + 1);
          } else if (token.type == TokenType.COMMA) {
            state = _ObjectState.COMMA;
            index++;
          } else {
            final src = settings.source ?? "";
            final msg = unexpectedToken(
                substring(
                    input, token.loc!.start.offset, token.loc!.end.offset),
                src,
                token.loc!.start.line,
                token.loc!.start.column);
            throw new JSONASTException(msg, input, src, token.loc!.start.line,
                token.loc!.start.column);
          }
          break;
        }

      case _ObjectState.COMMA:
        {
          final property = parseProperty(input, tokenList, index, settings);
          if (property != null) {
            index = property.index;
            object.children.add(property.value);
            state = _ObjectState.PROPERTY;
          } else {
            final src = settings.source ?? "";
            final msg = unexpectedToken(
                substring(
                    input, token.loc!.start.offset, token.loc!.end.offset),
                src,
                token.loc!.start.line,
                token.loc!.start.column);
            throw new JSONASTException(msg, input, src, token.loc!.start.line,
                token.loc!.start.column);
          }
          break;
        }
    }
  }
  throw errorEof(input, tokenList, settings);
}