code: function(language, patterns, bypass) {
  
              // if there is only one argument then we assume that we want to
              // extend the default language rules
              if (arguments.length == 1) {
                  patterns = language;
                  language = DEFAULT_LANGUAGE;
              }
  
              bypass_defaults[language] = bypass;
              language_patterns[language] = patterns.concat(language_patterns[language] || []);
          }
docs: extends the language pattern matches
  
  @param {*} language     name of language
  @param {*} patterns      array of patterns to add on
  @param {boolean|null} bypass      if true this will bypass the default language patterns