public MyVoid VisitFunctionStmt(Stmt.Function stmt)
{
// Capture the environment when the function is declared, for closures
LoxFunction function = new LoxFunction(stmt, environment, isInitializer: false);
environment.Define(stmt.name.lexeme, function);
return(null);
}
public int Arity()
{
LoxFunction initializer = FindMethod("init");
if (initializer == null)
{
return(0);
}
return(initializer.Arity());
}
public object Call(Interpreter interpreter, List <object> arguments)
{
LoxInstance instance = new LoxInstance(this);
LoxFunction initializer = FindMethod("init");
if (initializer != null)
{
initializer.bind(instance).call(intepreter, arguments);
}
if (isInitializer)
{
return closure.getAt(0, "this")
}
return(instance);
}
//Get property, given some token on this particular instance
public object Get(Token name)
{
if (fields.TryGetValue(name.lexeme, out object value))
{
return(value);
}
LoxFunction method = klass.FindMethod(name.lexeme);
if (method != null)
{
return(method.Bind(this));
}
//If instance doesn't have property, it's an error
throw new RuntimeError(name, $"Undefined property '{name.lexeme}'");
}
public MyVoid VisitClassStmt(Stmt.Class stmt)
{
environment.Define(stmt.name.lexeme, null);
Dictionary <string, LoxFunction> methods = new Dictionary <string, LoxFunction>();
foreach (Stmt.Function method in stmt.methods)
{
LoxFunction function = new LoxFunction(method, environment, isInitializer: method.name.lexeme == "init");
methods[method.name.lexeme] = function;
}
LoxClass klass = new LoxClass(stmt.name.lexeme, methods);
environment.Assign(stmt.name, new LoxClass(stmt.name.lexeme, methods));
return(null);
}