bool _allChangesAreCodeComments()

in app_dart/lib/src/request_handlers/github_webhook.dart [529:569]

33 lines of code
11 McCabe index (conditional complexity)


  bool _allChangesAreCodeComments(PullRequestFile file) {
    final int? linesAdded = file.additionsCount;
    final int? linesDeleted = file.deletionsCount;
    final String? patch = file.patch;
    // If information is missing, err or the side of assuming it's a non-comment
    // change.
    if (linesAdded == null || linesDeleted == null || patch == null) {
      return false;
    }

    // Ensure that the file is a language reconized by the check below.
    const Set<String> codeExtensions = <String>{
      'cc',
      'cpp',
      'dart',
      'java',
      'kt',
      'm',
      'mm',
      'swift',
    };
    final String filename = file.filename!;
    final String? extension = filename.contains('.') ? filename.split('.').last.toLowerCase() : null;
    if (extension == null || !codeExtensions.contains(extension)) {
      return false;
    }

    // Only handles single-line comments; identifying multi-line comments
    // would require the full file and non-trivial parsing. Also doesn't handle
    // end-of-line comments (e.g., "int x = 0; // Info about x").
    final RegExp commentRegex = RegExp(r'[+-]\s*//');
    for (String line in patch.split('\n')) {
      if (!line.startsWith('+') && !line.startsWith('-')) {
        continue;
      }
      if (!commentRegex.hasMatch(line)) {
        return false;
      }
    }
    return true;
  }