code: function white() {
      
          var c = walker.ch,
              token = '',
              conf = getConf();
      
          while (c === " " || c === "\t") {
              token += c;
              c = walker.nextChar();
          }
      
          tokener(token, 'white', conf);
      
      }
docs: token handlers follow for: white space, comment, string, identifier, number, operator