code: function (forceEscaped) {
                      var str, index = parserInput.i, isEscaped = false;
  
                      parserInput.save();
                      if (parserInput.$char('~')) {
                          isEscaped = true;
                      } else if (forceEscaped) {
                          parserInput.restore();
                          return;
                      }
  
                      str = parserInput.$quoted();
                      if (!str) {
                          parserInput.restore();
                          return;
                      }
                      parserInput.forget();
  
                      return new(tree.Quoted)(str.charAt(0), str.substr(1, str.length - 2), isEscaped, index, fileInfo);
                  }
docs: A string, which supports escaping " and '  "milky way" 'he\'s the one!'