upd: tools almost done

src/names.cpp

@@ -33,4 +33,19 @@ void VariableContainer::WriteVariable(const std::string &name,
     return;
   }
   top[name] = value;
+}
+void FucntionContainer::AddFunction(const std::string &name,
+                                    const FunctionItem &item) {
+  if (FunctionIndex.find(name) != FunctionIndex.end()) {
+    throw InterpretException("AddFunction: function already exists");
+  }
+  FunctionIndex[name] = item;
+}
+
+std::any FucntionContainer::CallFunction(
+    const std::string &name, const std::vector<ParaArguItemType> &args) {
+  if (FunctionIndex.find(name) == FunctionIndex.end()) {
+    throw InterpretException("CallFunction: function not found");
+  }
+  // TODO
 }