System.Xml.Xsl.XsltOld.Processor.GetVariableValue C# (CSharp) Method

        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);
            }
        }