NamespaceListNode.cs

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using System.Collections;
 
namespace System.Xml.Schema;
 
internal sealed class NamespaceListNode : SyntaxTreeNode
{
    private NamespaceList namespaceList;
 
    private object particle;
 
    public override bool IsNullable
    {
        get
        {
            throw new InvalidOperationException();
        }
    }
 
    public NamespaceListNode(NamespaceList namespaceList, object particle)
    {
        this.namespaceList = namespaceList;
        this.particle = particle;
    }
 
    public ICollection GetResolvedSymbols(SymbolsDictionary symbols)
    {
        return symbols.GetNamespaceListSymbols(namespaceList);
    }
 
    public override void ExpandTree(InteriorNode parent, SymbolsDictionary symbols, Positions positions)
    {
        SyntaxTreeNode syntaxTreeNode = null;
        foreach (int resolvedSymbol in GetResolvedSymbols(symbols))
        {
            if (symbols.GetParticle(resolvedSymbol) != particle)
            {
                symbols.IsUpaEnforced = false;
            }
            LeafNode leafNode = new LeafNode(positions.Add(resolvedSymbol, particle));
            if (syntaxTreeNode == null)
            {
                syntaxTreeNode = leafNode;
                continue;
            }
            InteriorNode interiorNode = new ChoiceNode();
            interiorNode.LeftChild = syntaxTreeNode;
            interiorNode.RightChild = leafNode;
            syntaxTreeNode = interiorNode;
        }
        if (parent.LeftChild == this)
        {
            parent.LeftChild = syntaxTreeNode;
        }
        else
        {
            parent.RightChild = syntaxTreeNode;
        }
    }
 
    public override void ConstructPos(BitSet firstpos, BitSet lastpos, BitSet[] followpos)
    {
        throw new InvalidOperationException();
    }
}