public static void CreateASTNodesForCmd(CommonTree ast, ASTNode cmdNode, int depth)
        {
            if (DetectNullNode(ast))
            {
                //not sure why this happens in ANTLR: some empty CommonTree nodes
                //we filter them out: otherwise they just create empty
                //lines in the generated C# code (with linenumber=0 which is no good either)
                //No children = we are not cutting anything real from the AST tree anyway
                return;
            }

            cmdNode.Text = ast.Text;

            if (ast.Text != null)
            {
                bool flag = false;

                if (ast.Text.Contains("¤"))
                {
                    if (ast.Text.StartsWith("ASTMETA" + "¤"))  //Handles SERIES, that is ASTGENR/ASTUPD
                    {
                        flag = true;
                    }
                    else if (ast.Text.StartsWith("ASTSHOW" + "¤"))
                    {
                        flag = true;
                    }
                    else if (ast.Text.StartsWith("ASTPRTELEMENT" + "¤"))
                    {
                        flag = true;
                    }
                    else if (ast.Text.StartsWith("ASTOLSELEMENT" + "¤"))
                    {
                        flag = true;
                    }
                    else if (ast.Text.StartsWith("ASTDECOMP" + "¤"))
                    {
                        flag = true;
                    }
                    else if (ast.Text.StartsWith("ASTLIST" + "¤"))
                    {
                        flag = true;
                    }
                }

                if (flag)
                {
                    string[] ss = ast.Text.Split('¤');
                    for (int i = 0; i < ss.Length; i++)
                    {
                        ss[i] = G.ReplaceGlueNew(ss[i]);
                    }
                    cmdNode.Text = ss[0];
                    cmdNode.specialExpressionAndLabelInfo = ss;
                }
            }

            if (cmdNode.Text != null)
            {
                if (Globals.addGlue)
                {
                    cmdNode.Text = G.ReplaceGlueNew(cmdNode.Text);
                }
            }
            cmdNode.Line = ast.Line;
            if (ast.Children == null)
            {
                return;
            }
            int num = ast.Children.Count;

            cmdNode.CreateChildren(num);
            for (int i = 0; i < num; ++i)
            {
                CommonTree d = (CommonTree)(ast.Children[i]);
                if (DetectNullNode(d))
                {
                    continue;
                }
                ASTNode cmdNodeChild = new ASTNode(null);  //unknown text
                cmdNodeChild.Parent = cmdNode;
                cmdNode.Add(cmdNodeChild);
                CreateASTNodesForCmd(d, cmdNodeChild, depth + 1);
            }
        }