NewInstructionAction.cs

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using System.Xml.XPath;
 
namespace System.Xml.Xsl.XsltOld;
 
internal class NewInstructionAction : ContainerAction
{
    private string _name;
 
    private string _parent;
 
    private bool _fallback;
 
    internal override void Compile(Compiler compiler)
    {
        XPathNavigator xPathNavigator = compiler.Input.Navigator.Clone();
        _name = xPathNavigator.Name;
        xPathNavigator.MoveToParent();
        _parent = xPathNavigator.Name;
        if (compiler.Recurse())
        {
            CompileSelectiveTemplate(compiler);
            compiler.ToParent();
        }
    }
 
    internal void CompileSelectiveTemplate(Compiler compiler)
    {
        NavigatorInput input = compiler.Input;
        do
        {
            if (Ref.Equal(input.NamespaceURI, input.Atoms.UriXsl) && Ref.Equal(input.LocalName, input.Atoms.Fallback))
            {
                _fallback = true;
                if (compiler.Recurse())
                {
                    CompileTemplate(compiler);
                    compiler.ToParent();
                }
            }
        }
        while (compiler.Advance());
    }
 
    internal override void Execute(Processor processor, ActionFrame frame)
    {
        switch (frame.State)
        {
        default:
            return;
        case 0:
            if (!_fallback)
            {
                throw XsltException.Create(System.SR.Xslt_UnknownExtensionElement, _name);
            }
            if (containedActions != null && containedActions.Count > 0)
            {
                processor.PushActionFrame(frame);
                frame.State = 1;
                return;
            }
            break;
        case 1:
            break;
        }
        frame.Finished();
    }
}