namespace Microsoft.CodeAnalysis.Syntax;

internal static class SyntaxListBuilderExtensions
{
	public static SyntaxTokenList ToTokenList(this SyntaxListBuilder? builder)
	{
		if (builder == null || builder.Count == 0)
		{
			return default(SyntaxTokenList);
		}
		return new SyntaxTokenList(null, builder.ToListNode(), 0, 0);
	}

	public static SyntaxList<SyntaxNode> ToList(this SyntaxListBuilder? builder)
	{
		GreenNode greenNode = builder?.ToListNode();
		if (greenNode == null)
		{
			return default(SyntaxList<SyntaxNode>);
		}
		return new SyntaxList<SyntaxNode>(greenNode.CreateRed());
	}

	public static SyntaxList<TNode> ToList<TNode>(this SyntaxListBuilder? builder) where TNode : SyntaxNode
	{
		GreenNode greenNode = builder?.ToListNode();
		if (greenNode == null)
		{
			return default(SyntaxList<TNode>);
		}
		return new SyntaxList<TNode>(greenNode.CreateRed());
	}

	public static SeparatedSyntaxList<TNode> ToSeparatedList<TNode>(this SyntaxListBuilder? builder) where TNode : SyntaxNode
	{
		GreenNode greenNode = builder?.ToListNode();
		if (greenNode == null)
		{
			return default(SeparatedSyntaxList<TNode>);
		}
		return new SeparatedSyntaxList<TNode>(new SyntaxNodeOrTokenList(greenNode.CreateRed(), 0));
	}
}