/// <summary>
/// Folds a numbered capture node.
/// </summary>
/// <param name="numberedCapture"></param>
/// <param name="argument">The argument to be passed to the visitor method.</param>
/// <returns>
/// <list type="number">
/// <item>The original node if it's to be kept</item>
/// <item>A different node to replace the original node with</item>
/// <item>Null if the node is to be removed</item>
/// </list>
/// </returns>
protected override GrammarNode <Char>?VisitNumberedCapture(NumberedCapture numberedCapture, TArgument argument)
{
if (numberedCapture is null)
{
throw new ArgumentNullException(nameof(numberedCapture));
}
GrammarNode <Char>?innerNode = this.Visit(numberedCapture.InnerNode, argument);
if (innerNode is null)
{
return(null);
}
else if (innerNode == numberedCapture.InnerNode)
{
return(numberedCapture);
}
else
{
return(new NumberedCapture(numberedCapture.Position, innerNode));
}
}
protected override String?VisitNumberedCapture(NumberedCapture numberedCapture, Unit argument) => this.Visit(numberedCapture.InnerNode, default);
/// <summary> /// Visits a numbered capture. /// </summary> /// <param name="numberedCapture"></param> /// <param name="argument">The argument data passed by the caller.</param> /// <returns>The result of visiting this node.</returns> protected abstract TReturn VisitNumberedCapture(NumberedCapture numberedCapture, TArgument argument);