convert method

@override Map<String, dynamic> convert(String input)

Converts input and returns the result of the conversion.

Implementation

@override
Map<String, dynamic> convert(String input) {
  List<String> lines = input.split('\n');
  Map<String, dynamic> object = {};
  List<dynamic> stack = [object];
  bool expect = false;

  final regex = RegExp(
    '^("((?:\\\\.|[^\\\\"])+)"|([a-z0-9\\-\\_]+))([ \t]*("((?:\\\\.|[^\\\\"])*)(")?|([a-z0-9\\-\\_]+)))?',
  );

  int i = 0;
  final j = lines.length;

  bool comment = false;

  for (; i < j; i++) {
    var line = lines[i].trim();

    if (line.startsWith('/*') && line.endsWith('*/')) {
      continue;
    }

    if (line.startsWith('/*')) {
      comment = true;
      continue;
    }

    if (line.endsWith('*/')) {
      comment = false;
      continue;
    }

    if (comment) {
      continue;
    }
    if (line == '' || line[0] == '/') {
      continue;
    }
    if (line[0] == '{') {
      expect = false;
      continue;
    }
    if (expect) {
      throw FormatException('Invalid syntax on line ${i + 1}.');
    }
    if (line[0] == '}') {
      stack.removeLast();
      continue;
    }

    while (true) {
      var m = regex.firstMatch(line);
      if (m == null) {
        throw FormatException('Invalid syntax on line ${i + 1}.');
      }
      dynamic key = (m[2] != null) ? m[2] : m[3];
      dynamic val = (m[6] != null) ? m[6] : m[8];

      if (val == null) {
        if ((stack[stack.length - 1] as Map)[key] == null) {
          (stack[stack.length - 1] as Map)[key] = {};
        }
        stack.add((stack[stack.length - 1] as Map)[key]);
        expect = true;
      } else {
        if (m[7] == null && m[8] == null) {
          line += '\n${lines[++i]}';
          continue;
        }

        if (val != '' && num.tryParse(val) != null) {
          val = num.parse(val);
        }
        if (val == 'true') {
          val = true;
        }
        if (val == 'false') {
          val = false;
        }
        if (val == 'null') {
          val = null;
        }
        if (val == 'undefined') {
          val = null;
        }

        (stack[stack.length - 1] as Map)[key] = val;
      }
      break;
    }
  }

  if (stack.length != 1) {
    throw FormatException('Open parentheses somewhere.');
  }

  return object;
}