System.Xml.Xsl.IlGen.XmlILOptimizerVisitor.IsConstructedExpression C# (CSharp) Method

        private bool IsConstructedExpression(QilNode nd) {
            QilTernary ndCond;

            // In debug mode, all functions should return void (streamed to writer), so that call stack
            // consistently shows caller's line number
            if (this.qil.IsDebug)
                return true;

            if (nd.XmlType.IsNode) {
                switch (nd.NodeType) {
                    case QilNodeType.ElementCtor:
                    case QilNodeType.AttributeCtor:
                    case QilNodeType.CommentCtor:
                    case QilNodeType.PICtor:
                    case QilNodeType.TextCtor:
                    case QilNodeType.RawTextCtor:
                    case QilNodeType.DocumentCtor:
                    case QilNodeType.NamespaceDecl:
                    case QilNodeType.XsltCopy:
                    case QilNodeType.XsltCopyOf:
                    case QilNodeType.Choice:
                        return true;

                    case QilNodeType.Loop:
                        // Return true if the return expression is constructed
                        return IsConstructedExpression(((QilLoop) nd).Body);

                    case QilNodeType.Sequence:
                        // Return true if the list is empty or at least one expression in the list is constructed
                        if (nd.Count == 0)
                            return true;

                        foreach (QilNode ndItem in nd) {
                            if (IsConstructedExpression(ndItem))
                                return true;
                        }
                        break;

                    case QilNodeType.Conditional:
                        // Return true if either left and right branches of the conditional are constructed
                        ndCond = (QilTernary) nd;
                        return IsConstructedExpression(ndCond.Center) || IsConstructedExpression(ndCond.Right);

                    case QilNodeType.Invoke:
                        // Return true if the function might return nodes
                        return !((QilInvoke) nd).Function.XmlType.IsAtomicValue;
                }
            }

            return false;
        }