BadDeleteExpression.cs

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using BadScript2.Common;
using BadScript2.Runtime;
using BadScript2.Runtime.Error;
using BadScript2.Runtime.Objects;
 
namespace BadScript2.Parser.Expressions;
 
public class BadDeleteExpression : BadExpression
{
    public readonly BadExpression Expression;
 
    public BadDeleteExpression(BadExpression expression, BadSourcePosition position) : base(false, position)
    {
        Expression = expression;
    }
 
    public override IEnumerable<BadExpression> GetDescendants()
    {
        return Expression.GetDescendantsAndSelf();
    }
 
    protected override IEnumerable<BadObject> InnerExecute(BadExecutionContext context)
    {
        BadObject? obj = BadObject.Null;
 
        foreach (BadObject o in Expression.Execute(context))
        {
            obj = o;
 
            yield return o;
        }
 
        if (obj is not BadObjectReference r)
        {
            throw BadRuntimeException.Create(context.Scope, $"Cannot delete {Expression}", Position);
        }
 
        r.Delete();
 
        yield return BadObject.Null;
    }
}