XmlILAnnotation.cs

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using System.Reflection;
using System.Xml.Xsl.Qil;
 
namespace System.Xml.Xsl.IlGen;
 
internal sealed class XmlILAnnotation : ListBase<object>
{
    private readonly object _annPrev;
 
    private MethodInfo _funcMethod;
 
    private int _argPos;
 
    private IteratorDescriptor _iterInfo;
 
    private XmlILConstructInfo _constrInfo;
 
    private OptimizerPatterns _optPatt;
 
    public MethodInfo FunctionBinding
    {
        get
        {
            return _funcMethod;
        }
        set
        {
            _funcMethod = value;
        }
    }
 
    public int ArgumentPosition
    {
        get
        {
            return _argPos;
        }
        set
        {
            _argPos = value;
        }
    }
 
    public IteratorDescriptor CachedIteratorDescriptor
    {
        get
        {
            return _iterInfo;
        }
        set
        {
            _iterInfo = value;
        }
    }
 
    public XmlILConstructInfo ConstructInfo
    {
        get
        {
            return _constrInfo;
        }
        set
        {
            _constrInfo = value;
        }
    }
 
    public OptimizerPatterns Patterns
    {
        get
        {
            return _optPatt;
        }
        set
        {
            _optPatt = value;
        }
    }
 
    public override int Count
    {
        get
        {
            if (_annPrev == null)
            {
                return 2;
            }
            return 3;
        }
    }
 
    public override object this[int index]
    {
        get
        {
            if (_annPrev != null)
            {
                if (index == 0)
                {
                    return _annPrev;
                }
                index--;
            }
            return index switch
            {
                0 => _constrInfo, 
                1 => _optPatt, 
                _ => throw new IndexOutOfRangeException(), 
            };
        }
        set
        {
            throw new NotSupportedException();
        }
    }
 
    public static XmlILAnnotation Write(QilNode nd)
    {
        XmlILAnnotation xmlILAnnotation = nd.Annotation as XmlILAnnotation;
        if (xmlILAnnotation == null)
        {
            xmlILAnnotation = (XmlILAnnotation)(nd.Annotation = new XmlILAnnotation(nd.Annotation));
        }
        return xmlILAnnotation;
    }
 
    private XmlILAnnotation(object annPrev)
    {
        _annPrev = annPrev;
    }
}