stripHtmlComments function

({String content, bool stripped}) stripHtmlComments(String content)

Strip block-level HTML comments from markdown content.

Uses simple detection to identify comments at the block level only. Inline HTML comments inside a paragraph are left intact. Unclosed comments are left in place.

Implementation

({String content, bool stripped}) stripHtmlComments(String content) {
  if (!content.contains('<!--')) {
    return (content: content, stripped: false);
  }

  final commentPattern = RegExp(r'<!--[\s\S]*?-->');
  final lines = content.split('\n');
  final result = StringBuffer();
  bool stripped = false;

  for (int i = 0; i < lines.length; i++) {
    final line = lines[i];
    final trimmed = line.trimLeft();
    if (trimmed.startsWith('<!--') && trimmed.contains('-->')) {
      final residue = line.replaceAll(commentPattern, '');
      stripped = true;
      if (residue.trim().isNotEmpty) {
        result.writeln(residue);
      }
    } else {
      result.writeln(line);
    }
  }

  return (content: result.toString(), stripped: stripped);
}