SingletonFocus.cs

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using System.Xml.Xsl.Qil;
using System.Xml.Xsl.XPath;
 
namespace System.Xml.Xsl.Xslt;
 
internal struct SingletonFocus : IFocus
{
    private readonly XPathQilFactory _f;
 
    private SingletonFocusType _focusType;
 
    private QilIterator _current;
 
    public SingletonFocus(XPathQilFactory f)
    {
        _f = f;
        _focusType = SingletonFocusType.None;
        _current = null;
    }
 
    public void SetFocus(SingletonFocusType focusType)
    {
        _focusType = focusType;
    }
 
    public void SetFocus(QilIterator current)
    {
        if (current != null)
        {
            _focusType = SingletonFocusType.Iterator;
            _current = current;
        }
        else
        {
            _focusType = SingletonFocusType.None;
            _current = null;
        }
    }
 
    public QilNode GetCurrent()
    {
        return _focusType switch
        {
            SingletonFocusType.InitialDocumentNode => _f.Root(_f.XmlContext()), 
            SingletonFocusType.InitialContextNode => _f.XmlContext(), 
            _ => _current, 
        };
    }
 
    public QilNode GetPosition()
    {
        return _f.Double(1.0);
    }
 
    public QilNode GetLast()
    {
        return _f.Double(1.0);
    }
}