convert method

Implementation

@override
List<String> convert(String? input) {
  if (input == null || input.isEmpty) {
    return [];
  }

  final result = <String>[];
  var current = '';
  String? inQuote;
  var lastTokenHasBeenQuoted = false;

  for (var index = 0; index < input.length; index++) {
    final token = input[index];

    if (inQuote != null) {
      // Inside quotes - add everything except the closing quote
      if (token == inQuote) {
        lastTokenHasBeenQuoted = true;
        inQuote = null;
      } else {
        current += token;
      }
    } else {
      // Outside quotes - handle special characters
      switch (token) {
        case "'":
        case '"':
          // Start quoted section
          inQuote = token;
          break;
        case ' ':
          // Space separator - add current token if not empty or was quoted
          if (lastTokenHasBeenQuoted || current.isNotEmpty) {
            result.add(current);
            current = '';
          }
          lastTokenHasBeenQuoted = false;
          break;
        default:
          // Regular character
          current += token;
          lastTokenHasBeenQuoted = false;
      }
    }
  }

  // Add final token if it exists
  if (lastTokenHasBeenQuoted || current.isNotEmpty) {
    result.add(current);
  }

  // Check for unbalanced quotes
  if (inQuote != null) {
    throw Exception('Unbalanced quote $inQuote in command line: $input');
  }

  return result;
}