Tinkering with gperf options

src/json_token_enum.hpp

@@ -1,5 +1,8 @@
 #pragma once
 
+#include "json_tokens.hpp"
+#include <string_view>
+
 enum class JsonTokenType {
   Unknown = 0,
   Preconditions = 1,
@@ -20,13 +23,10 @@ enum class JsonTokenType {
   RangeDelete = 16
 };
 
-#include "json_tokens.hpp"
-#include <string_view>
-
 inline JsonTokenType get_json_token_type(std::string_view str) {
   const JsonToken *token =
       Perfect_Hash::lookup_json_token(str.data(), str.size());
-  if (token && token->name[0] != '\0') { // Check that we got a valid token
+  if (token) {
     return static_cast<JsonTokenType>(token->token_id);
   }
   return JsonTokenType::Unknown;

src/json_tokens.gperf

@@ -3,11 +3,13 @@
 %}
 %define hash-function-name hash_json_token
 %define lookup-function-name lookup_json_token
-%language=C++
-%global-table
-%struct-type
-%readonly-tables
 %compare-lengths
+%global-table
+%language=C++
+%null-strings
+%readonly-tables
+%struct-type
+%switch=1
 
 struct JsonToken {
   const char* name;