public object Visit(Index expr)
{
object callee = Evaluate(expr.callee);
if (!(callee is ICollection))
{
throw new ErrorHandler.RuntimeError(expr.bracket, "Expected indexable type");
}
ICollection called = (ICollection)callee;
object first = Evaluate(expr.first);
object second = expr.second != null?Evaluate(expr.second) : null;
object third = expr.third != null?Evaluate(expr.third) : null;
return(called.Access(this, expr.bracket, first, second, third));
}
public object Visit(Index expr)
{
object callee = Evaluate(expr.callee);
if (callee is ICollection)
{
ICollection called = (ICollection)callee;
object first = Evaluate(expr.first);
object second = expr.second != null?Evaluate(expr.second) : null;
object third = expr.third != null?Evaluate(expr.third) : null;
return(called.Access(this, expr.bracket, first, second, third));
}
if (callee is string)
{
string str = (string)callee;
object first = Evaluate(expr.first);
object second = expr.second != null?Evaluate(expr.second) : null;
object third = expr.third != null?Evaluate(expr.third) : null;
if (expr.callee is Literal)
{
return(Toy.Library.String.SliceNotationLiteral(expr.callee, expr.bracket, first, second, third));
}
if (expr.callee is Variable)
{
return(Toy.Library.String.SliceNotationVariable(expr.callee, expr.bracket, this, first, second, third));
}
}
throw new ErrorHandler.RuntimeError(expr.bracket, "Expected indexable type (found " + (callee == null ? "null" : callee.ToString()) + ")");
}