+ virtual void visit(StructDeclaration &) { }
+ virtual void visit(VariableDeclaration &);
+ virtual void visit(FunctionDeclaration &);
+};
+
+/** Replaces expressions consisting entirely of literals with the results of
+evaluating the expression.*/
+class ConstantFolder: private TraversingVisitor
+{
+private:
+ VariableDeclaration *iteration_var = 0;
+ Variant iter_init_value;
+ Variant r_constant_value;
+ bool iteration_init = false;
+ bool r_constant = false;
+ bool r_literal = false;
+ bool r_uses_iter_var = false;
+ bool r_any_folded = false;
+
+public:
+ bool apply(Stage &s) { s.content.visit(*this); return r_any_folded; }
+
+private:
+ template<typename T>
+ static T evaluate_logical(char, T, T);
+ template<typename T>
+ static bool evaluate_relation(const char *, T, T);
+ template<typename T>
+ static T evaluate_arithmetic(char, T, T);
+ template<typename T>
+ static T evaluate_int_special_op(char, T, T);
+ template<typename T>
+ void convert_to_result(const Variant &);
+ void set_result(const Variant &, bool = false);
+
+ virtual void visit(RefPtr<Expression> &);
+ virtual void visit(Literal &);
+ virtual void visit(VariableReference &);