XslNode.cs

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using System.Collections.Generic;
using System.Xml.Xsl.Qil;
 
namespace System.Xml.Xsl.Xslt;
 
internal class XslNode
{
    public readonly XslNodeType NodeType;
 
    public ISourceLineInfo SourceLine;
 
    public NsDecl Namespaces;
 
    public readonly QilName Name;
 
    public readonly object Arg;
 
    public readonly XslVersion XslVersion;
 
    public XslFlags Flags;
 
    private List<XslNode> _content;
 
    private static readonly IList<XslNode> s_emptyList = new List<XslNode>().AsReadOnly();
 
    public string Select => (string)Arg;
 
    public bool ForwardsCompatible => XslVersion == XslVersion.ForwardsCompatible;
 
    public IList<XslNode> Content
    {
        get
        {
            IList<XslNode> content = _content;
            return content ?? s_emptyList;
        }
    }
 
    public XslNode(XslNodeType nodeType, QilName name, object arg, XslVersion xslVer)
    {
        NodeType = nodeType;
        Name = name;
        Arg = arg;
        XslVersion = xslVer;
    }
 
    public XslNode(XslNodeType nodeType)
    {
        NodeType = nodeType;
        XslVersion = XslVersion.Version10;
    }
 
    public void SetContent(List<XslNode> content)
    {
        _content = content;
    }
 
    public void AddContent(XslNode node)
    {
        if (_content == null)
        {
            _content = new List<XslNode>();
        }
        _content.Add(node);
    }
 
    public void InsertContent(IEnumerable<XslNode> collection)
    {
        if (_content == null)
        {
            _content = new List<XslNode>(collection);
        }
        else
        {
            _content.InsertRange(0, collection);
        }
    }
}