Remove stack, just use state machine

src/commit_request.hpp

@@ -64,9 +64,6 @@ public:
   // Parser state
   enum class ParseState {
     Root,
-    RequestId,
-    LeaderId,
-    ReadVersion,
     PreconditionsArray,
     PreconditionObject,
     OperationsArray,
@@ -82,12 +79,9 @@ public:
   struct ParserContext {
     using ArenaString = std::basic_string<char, std::char_traits<char>,
                                           ArenaStlAllocator<char>>;
-    using ArenaStateStack =
-        std::stack<ParseState,
-                   std::vector<ParseState, ArenaStlAllocator<ParseState>>>;
     ArenaAllocator arena;
 
-    ArenaStateStack state_stack;
+    ParseState current_state = ParseState::Root;
     ArenaString current_key;
     ArenaString current_string;
     ArenaString current_number;
@@ -105,8 +99,7 @@ public:
 
     // Constructor to initialize arena-allocated containers
     explicit ParserContext()
-        : state_stack(ArenaStateStack::container_type(
-              ArenaStlAllocator<ParseState>(&arena))),
+        :
           current_key(ArenaStlAllocator<char>(&arena)),
           current_string(ArenaStlAllocator<char>(&arena)),
           current_number(ArenaStlAllocator<char>(&arena)),
@@ -122,8 +115,7 @@ public:
       current_operation = {};
       precondition_type = ArenaString{ArenaStlAllocator<char>(&arena)};
       operation_type = ArenaString{ArenaStlAllocator<char>(&arena)};
-      state_stack = ArenaStateStack{ArenaStateStack::container_type(
-          ArenaStlAllocator<ParseState>(&arena))};
+      current_state = ParseState::Root;
     }
   };
 
@@ -313,7 +305,7 @@ public:
       WeaselJsonParser_reset(json_parser_);
     }
     parser_context_.reset_arena_memory();
-    parser_context_.state_stack.push(ParseState::Root);
+    parser_context_.current_state = ParseState::Root;
     parser_context_.parse_error = nullptr;
     parser_context_.parse_complete = false;
   }