public object visitAssignExpr(Expr.Assign expr)
{
object value = Evaluate(expr.value);
int distance = -1;
if (locals.ContainsKey(expr))
{
distance = locals[expr];
}
if (distance != -1)
{
environment.AssignAt(distance, expr.name, value);
}
else
{
environment.Assign(expr.name, value);
}
environment.Assign(expr.name, value);
return(value);
}
public void Assign(Token name, object value)
{
if (values.ContainsKey(name.lexeme))
{
values[name.lexeme] = value;
return;
}
if (enclosing != null)
{
enclosing.Assign(name, value);
return;
}
throw new RuntimeError(name, "Undefined variable '" + name.lexeme + "',");
}