detectDuplicateKeys static method

Implementation

static List<String> detectDuplicateKeys(String content) {
  final duplicates = <String>[];
  final lines = content.split('\n');
  final keyStack = <String>[];
  final keyCounts = <String, int>{};

  for (final line in lines) {
    final trimmed = line.trim();
    final keyMatch = RegExp(r'^"([^"]+)"\s*:').firstMatch(trimmed);
    if (keyMatch != null) {
      final key = keyMatch.group(1)!;
      keyStack.add(key);
      final fullPath = keyStack.join('.');
      keyCounts[fullPath] = (keyCounts[fullPath] ?? 0) + 1;
    }
    if (trimmed == '}' || trimmed.endsWith('},')) {
      if (keyStack.isNotEmpty) keyStack.removeLast();
    }
  }

  for (final entry in keyCounts.entries) {
    if (entry.value > 1) {
      duplicates.add(entry.key);
    }
  }
  return duplicates;
}