anchor.diff:    // link and image
     //
   
  -  // TODO support for html and autolinks
     Parser linkWhitespace = (blankline > whitespace) | whitespace;
     Parser get linkInline => (char('(') > (
         (
  
positive.code:       return textRes;
      }
      String raw = textRes.value.join();
      // TODO parse inlines
  
      _UnparsedInlines inlines = new _UnparsedInlines(raw.trim());
      return textRes.copy(value: [new AtxHeader(level, inlines)]);
    });
  
negative.code:   CommonMarkParser();
  
    Map<String, Target> _references;
  
    Document parse(String s) {
      // TODO separate preprocess option
  