Some more error checking for class names and tangible IDs

luprex/cpp/core/luastack.hpp

@@ -417,6 +417,15 @@ public:
 
     int next(LuaSlot tab, LuaSlot key, LuaSlot value) const;
 
+    // Return true if the string is a valid lua identifier.
+    static bool valididentifier(std::string_view id);
+
+    // Return true if the int64 can be stored losslessly in a lua_Number.
+    static bool validint64(int64_t value);
+
+    // Return true if the int64 is storable in lua and is positive.
+    static bool validpositiveint64(int64_t value);
+
     // Return true if the classname is legal.
     bool validclassname(LuaSlot value) const;
     static bool validclassname(std::string_view cname);
@@ -446,6 +455,9 @@ public:
     // stub into a full blown tangible, and World::tangible_delete to turn
     // a full-blown tangible back into a stub.  A stub doesn't have a
     // class or a thread table.
+    //
+    // Assert-fails if the tangible ID is not a validpositiveint64.
+    //
     void maketan(LuaSlot tab, int64_t id) const;
 
     // Return true if a tangible is empty (deleted or not yet created).
@@ -454,6 +466,9 @@ public:
     // Get the ID of a tangible.
     int64_t tanid(LuaSlot tab) const;
 
+    // Get the class of a tangible.
+    bool tangetclass(LuaSlot classobj, LuaSlot tan);
+
     // Return true if the value is a sortable key (string, number, or boolean).
     bool issortablekey(LuaSlot s) const;