System.Xml.Xsl.XsltOld.ActionFrame.Init C# (CSharp) Method

        private void Init(Action action, ActionFrame container, XPathNodeIterator nodeSet) {
            this.state         = Action.Initialized;
            this.action        = action;
            this.container     = container;
            this.currentAction = 0;
            this.nodeSet       = nodeSet;
            this.newNodeSet    = null;
        }

        internal object GetVariableValue(VariableAction variable)
        {
            int variablekey = variable.VarKey;

            if (variable.IsGlobal)
            {
                ActionFrame rootFrame = (ActionFrame)this.actionStack[0];
                object      result    = rootFrame.GetVariable(variablekey);
                if (result != null)
                {
                    return(result);
                }
                // Variable wasn't evaluated yet
                if (variable.Stylesheetid == -1)
                {
                    throw XsltException.Create(Res.Xslt_CircularReference, variable.NameStr);
                }
                int         saveStackSize = this.actionStack.Length;
                ActionFrame varFrame      = PushNewFrame();
                varFrame.Inherit(rootFrame);
                varFrame.Init(variable, rootFrame.NodeSet);
                do
                {
                    bool endOfFrame = ((ActionFrame)this.actionStack.Peek()).Execute(this);
                    if (endOfFrame)
                    {
                        this.actionStack.Pop();
                    }
                } while (saveStackSize < this.actionStack.Length);
                Debug.Assert(saveStackSize == this.actionStack.Length);
                result = rootFrame.GetVariable(variablekey);
                Debug.Assert(result != null, "Variable was just calculated and result can't be null");
                return(result);
            }
            else
            {
                return(((ActionFrame)this.actionStack.Peek()).GetVariable(variablekey));
            }
        }