XmlNavigatorStack.cs

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using System.Xml.XPath;
 
namespace System.Xml.Xsl.Runtime;
 
internal struct XmlNavigatorStack
{
    private XPathNavigator[] _stkNav;
 
    private int _sp;
 
    public bool IsEmpty => _sp == 0;
 
    public void Push(XPathNavigator nav)
    {
        if (_stkNav == null)
        {
            _stkNav = new XPathNavigator[8];
        }
        else if (_sp >= _stkNav.Length)
        {
            XPathNavigator[] stkNav = _stkNav;
            _stkNav = new XPathNavigator[2 * _sp];
            Array.Copy(stkNav, _stkNav, _sp);
        }
        _stkNav[_sp++] = nav;
    }
 
    public XPathNavigator Pop()
    {
        return _stkNav[--_sp];
    }
 
    public XPathNavigator Peek()
    {
        return _stkNav[_sp - 1];
    }
 
    public void Reset()
    {
        _sp = 0;
    }
}