XcodeExtension1.m

- (void)performCommandWithInvocation:(XCSourceEditorCommandInvocation *)invocation completionHandler:(void (^)(NSError * _Nullable nilOrError))completionHandler {
    
      //Checks if the file contains source code of Objective-C or Swift. Then is sets the appropriate variables
    if ([invocation.buffer.contentUTI isEqualToString:@"public.objective-c-source"]) {
            logString = @"NSLog(";
            logCommentString=@"DSLog(";
            regularExpressionString =@"NSLog\\([^\\)]*\\)[\\s]*\\;";
            regularExpressionCommentString=@"\\/\\*DSLog\\([^\\)]*\\)[\\s]*\\;\\*\\/";
    }
    else if ([invocation.buffer.contentUTI isEqualToString:@"public.swift-source"]){
            logString = @"print(";
            logCommentString = @"drint(";
            regularExpressionString =@"(Swift.){0,1}print\\([^\\)]*\\)[\t]*[\\;]{0,1}";
            regularExpressionCommentString=@"\\/\\*(Swift.){0,1}drint\\([^\\)]*\\)[\ts]*[\\;]{0,1}\\*\\/";
    }
}