public object Call(Interpreter interpreter, List <object> arguments)
{
VariableEnvironment environment = new VariableEnvironment(closure);
for (int i = 0; i < declaration.parameters.Count; i++)
{
environment.Define(declaration.parameters[i].lexeme, arguments[i]);
}
try
{
interpreter.ExecuteBlock(declaration.body, environment);
}
catch (Return returnValue)
{
// Allow an empty return ("return;") in a constructor. When this happens, return "this".
if (isInitializer)
{
return(closure.GetAt(0, "this"));
}
return(returnValue.value);
}
return(null);
}
private object LookUpVariable(Token name, Expr expr)
{
if (locals.TryGetValue(expr, out int distance))
{
return(environment.GetAt(distance, name.lexeme));
}
else
{
return(globals.Get(name));
}
}
