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

        private QilNode CompileMatchPattern(string pttrn)
        {
            Debug.Assert(pttrn != null);
            XPathScanner scanner;
            QilNode result;

            SetEnvironmentFlags(/*allowVariables:*/false, /*allowCurrent:*/false, /*allowKey:*/true);
            try
            {
                scanner = new XPathScanner(pttrn);
                result = _ptrnParser.Parse(scanner, _ptrnBuilder);
            }
            catch (XslLoadException e)
            {
                if (_xslVersion != XslVersion.ForwardsCompatible)
                {
                    ReportErrorInXPath(/*[XT0340]*/e);
                }
                result = _f.Loop(_f.For(_ptrnBuilder.FixupNode),
                    _f.Error(_f.String(e.Message))
                );
                XPathPatternBuilder.SetPriority(result, 0.5);
            }
            return result;
        }