System.Xml.Xsl.Xslt.QilGenerator.CompileKeyUse C# (CSharp) Method

        private QilNode CompileKeyUse(Key key)
        {
            string expr = key.Use;
            XPathScanner scanner;
            QilNode result;

            SetEnvironmentFlags(/*allowVariables:*/false, /*allowCurrent:*/true, /*allowKey:*/false);
            if (expr == null)
            {
                result = _f.Error(_f.String(XslLoadException.CreateMessage(key.SourceLine, SR.Xslt_MissingAttribute, "use")));
            }
            else
            {
                try
                {
                    scanner = new XPathScanner(expr);
                    result = _xpathParser.Parse(scanner, _xpathBuilder, LexKind.Eof);
                }
                catch (XslLoadException e)
                {
                    if (_xslVersion != XslVersion.ForwardsCompatible)
                    {
                        ReportErrorInXPath(/*[XT0300]*/e);
                    }
                    result = _f.Error(_f.String(e.Message));
                }
            }
            if (result is QilIterator)
            {
                result = _f.Nop(result);
            }
            return result;
        }