Right now we use codemirror's JavaScript mode on the website but there's a JSX mode now so we should start using that instead.

return function(type) {
      if (type == wanted) return cont();
      else if (wanted == ";") return pass();
      else return cont(arguments.callee);
    };
  }
  function statement(type) {
    if (type == "var") return cont(pushlex("vardef"), vardef1, expect(";"), poplex);
    if (type == "keyword a") return cont(pushlex("form"), expression, statement, poplex);
    if (type == "keyword b") return cont(pushlex("form"), statement, poplex);
    if (type == "{") return cont(pushlex("}"), block, poplex);
    if (type == ";") return cont();
    if (type == "function") return cont(functiondef);
    if (type == "for") return cont(pushlex("form"), expect("("), pushlex(")"), forspec1, expect(")"),
                                      poplex, statement, poplex);
    if (type == "variable") return cont(pushlex("stat"), maybelabel);
    if (type == "switch") return cont(pushlex("form"), expression, pushlex("}", "switch"), expect("{"),
                                         block, poplex, poplex);
    if (type == "case") return cont(expression, expect(":"));
    if (type == "default") return cont(expect(":"));
    if (type == "catch") return cont(pushlex("form"), pushcontext, expect("("), funarg, expect(")"),
                                        statement, poplex, popcontext);
    return pass(pushlex("stat"), expression, expect(";"), poplex);
  }
  function expression(type) {