Exemplo n.º 1
0
        public void VisitClassStmt(ClassStmt stmt)
        {
            Declare(stmt.Name);
            Define(stmt.Name);

            var enclosingClass = currentClass;

            currentClass = ClassType.Class;

            if (stmt.SuperClass != null)
            {
                currentClass = ClassType.SubClass;
                Resolve(stmt.SuperClass);
                BeginScope();
                scopes.Peek().Add("super", new VariableData {
                    Defined = true,
                    Line    = stmt.Name.Line,
                    Used    = true
                });
            }

            BeginScope();
            scopes.Peek().Add("this", new VariableData {
                Defined = true,
                Line    = stmt.Name.Line,
                Used    = true
            });

            foreach (var method in stmt.Methods)
            {
                var declaration = FunctionType.Method;

                if (method.Name.Lexeme.Equals("init"))
                {
                    declaration = FunctionType.Initializer;
                }

                ResolveFunction(method, declaration);
            }
            EndScope();

            if (stmt.SuperClass != null)
            {
                EndScope();
            }

            currentClass = enclosingClass;
        }
Exemplo n.º 2
0
        public void VisitClassStmt(ClassStmt stmt)
        {
            environment.Define(stmt.Name.Lexeme, null);

            object superClass = null;

            if (stmt.SuperClass != null)
            {
                superClass = Evaluate(stmt.SuperClass);
                if (!(superClass is LoxClass))
                {
                    throw new RuntimeError(stmt.SuperClass.Name, "Superclass must be class.");
                }

                environment = new Environment(environment);
                environment.Define("super", superClass);
            }

            var methods = new Dictionary <string, LoxFunction>();

            foreach (var method in stmt.Methods)
            {
                var function = new LoxFunction(method, environment, method.Name.Lexeme.Equals("init"));

                methods.Add(method.Name.Lexeme, function);
            }

            var klass = new LoxClass(stmt.Name.Lexeme, (LoxClass)superClass, methods);

            if (stmt.SuperClass != null)
            {
                environment = environment.Enclosing;
            }

            environment.Assign(stmt.Name, klass);
        }