using System.Collections;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.Text;

using System.Globalization;
using Godot;
using System;

namespace Rokojori;


public class ASTWalker:TreeWalker<ASTNode>
{
  public static readonly ASTWalker instance = new ASTWalker(); 

  public override ASTNode Parent( ASTNode node )
  {
    return node?.parent;
  }
  
  public override ASTNode ChildAt( ASTNode node, int index )
  {
    if ( node == null || index < 0 || index >= node.children.Count  )
    {
      return null;
    }

    return node.children[ index ];
  }
  
  public override int NumChildren( ASTNode node )
  {
    return node?.children.Count ?? 0;
  }
}