BadRunnable.cs

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using BadScript2.Runtime;
using BadScript2.Runtime.Error;
using BadScript2.Runtime.Objects;
using BadScript2.Runtime.Objects.Functions;
 
namespace BadScript2.Interop.Common.Task;
 
public abstract class BadRunnable
{
    public BadRuntimeError? Error { get; private set; }
 
    public static BadRunnable Empty { get; } = new BadEmptyRunnable();
 
    public abstract IEnumerator<BadObject> Enumerator { get; }
 
    public abstract BadObject GetReturn();
 
    public void SetError(BadRuntimeError err)
    {
        Error = err;
    }
 
    public static BadRunnable Create(IEnumerable<BadObject> e)
    {
        return Create(e.GetEnumerator());
    }
 
    public static BadRunnable Create(IEnumerator<BadObject> e)
    {
        return new BadRunnableImpl(e);
    }
 
    public static BadRunnable Create(BadFunction func, BadExecutionContext ctx, params BadObject[] args)
    {
        return new BadFunctionRunnable(func, ctx, args);
    }
 
    private class BadEmptyRunnable : BadRunnable
    {
        // ReSharper disable once NotDisposedResourceIsReturnedByProperty
        public override IEnumerator<BadObject> Enumerator => Enumerable.Empty<BadObject>().GetEnumerator();
 
        public override BadObject GetReturn()
        {
            return BadObject.Null;
        }
    }
 
 
    private class BadRunnableImpl : BadRunnable
    {
        public BadRunnableImpl(IEnumerator<BadObject> enumerator)
        {
            Enumerator = enumerator;
        }
 
        public override IEnumerator<BadObject> Enumerator { get; }
 
        public override BadObject GetReturn()
        {
            return BadObject.Null;
        }
    }
 
    private class BadFunctionRunnable : BadRunnable
    {
        private BadObject m_ReturnValue = BadObject.Null;
 
        public BadFunctionRunnable(BadFunction func, BadExecutionContext ctx, params BadObject[] args)
        {
            Enumerator = RunnableFunction(func, ctx, args).GetEnumerator();
        }
 
        public override IEnumerator<BadObject> Enumerator { get; }
 
 
        private IEnumerable<BadObject> RunnableFunction(
            BadFunction func,
            BadExecutionContext ctx,
            params BadObject[] args)
        {
            BadObject obj = BadObject.Null;
 
            foreach (BadObject o in func.Invoke(args, ctx))
            {
                obj = o;
 
                yield return o;
            }
 
            m_ReturnValue = obj.Dereference();
        }
 
        public override BadObject GetReturn()
        {
            return m_ReturnValue;
        }
    }
}