public void AugmentQuickInfoSession(IQuickInfoSession session, IList <object> quickInfoContent, out ITrackingSpan applicableToSpan)
            {
                ITextSnapshot  snapshot     = _buffer.CurrentSnapshot;
                ITrackingPoint triggerPoint = session.GetTriggerPoint(_buffer);
                SnapshotPoint  point        = triggerPoint.GetPoint(snapshot);

                SyntaxTree syntax            = snapshot.GetSyntaxTree();
                RobotsTxtDocumentSyntax root = syntax.Root as RobotsTxtDocumentSyntax;

                applicableToSpan = null;

                // find section
                RobotsTxtLineSyntax line = root.Records
                                           .SelectMany(r => r.Lines)
                                           .FirstOrDefault(s => s.NameToken.Span.Span.Contains(point));

                if (line != null)
                {
                    IClassificationFormatMap formatMap = _classificationFormatMapService.GetClassificationFormatMap(session.TextView);

                    string fieldName = line.NameToken.Value;

                    // get glyph
                    var glyph = _glyphService.GetGlyph(StandardGlyphGroup.GlyphGroupProperty, StandardGlyphItem.GlyphItemPublic);
                    var classificationType = _classificationRegistry.GetClassificationType("RobotsTxt/RecordName");
                    var format             = formatMap.GetTextProperties(classificationType);

                    // construct content
                    ISemanticModel model = syntax.GetSemanticModel();
                    var            field = model.GetFieldSymbol(line);

                    var content = new QuickInfoContent
                    {
                        Glyph     = glyph,
                        Signature = new Run(field.Name)
                        {
                            Foreground = format.ForegroundBrush
                        },
                        Documentation = RobotsTxtDocumentation.GetDocumentation(field),
                    };

                    // add to session
                    quickInfoContent.Add(
                        new ContentPresenter
                    {
                        Content         = content,
                        ContentTemplate = Template,
                    }
                        );
                    applicableToSpan = snapshot.CreateTrackingSpan(line.NameToken.Span.Span, SpanTrackingMode.EdgeInclusive);
                    return;
                }
            }
            public void AugmentQuickInfoSession(IQuickInfoSession session, IList<object> quickInfoContent, out ITrackingSpan applicableToSpan)
            {
                ITextSnapshot snapshot = _buffer.CurrentSnapshot;
                ITrackingPoint triggerPoint = session.GetTriggerPoint(_buffer);
                SnapshotPoint point = triggerPoint.GetPoint(snapshot);

                SyntaxTree syntax = snapshot.GetSyntaxTree();
                RobotsTxtDocumentSyntax root = syntax.Root as RobotsTxtDocumentSyntax;

                applicableToSpan = null;

                // find section
                RobotsTxtLineSyntax line = root.Records
                    .SelectMany(r => r.Lines)
                    .FirstOrDefault(s => s.NameToken.Span.Span.Contains(point));
                
                if (line != null)
                {
                    IClassificationFormatMap formatMap = _classificationFormatMapService.GetClassificationFormatMap(session.TextView);

                    string fieldName = line.NameToken.Value;
                    
                    // get glyph
                    var glyph = _glyphService.GetGlyph(StandardGlyphGroup.GlyphGroupProperty, StandardGlyphItem.GlyphItemPublic);
                    var classificationType = _classificationRegistry.GetClassificationType("RobotsTxt/RecordName");
                    var format = formatMap.GetTextProperties(classificationType);

                    // construct content
                    ISemanticModel model = syntax.GetSemanticModel();
                    var field = model.GetFieldSymbol(line);

                    var content = new QuickInfoContent
                    {
                        Glyph = glyph,
                        Signature = new Run(field.Name) { Foreground = format.ForegroundBrush },
                        Documentation = RobotsTxtDocumentation.GetDocumentation(field),
                    };
                    
                    // add to session
                    quickInfoContent.Add(
                        new ContentPresenter
                        {
                            Content = content,
                            ContentTemplate = Template,
                        }
                    );
                    applicableToSpan = snapshot.CreateTrackingSpan(line.NameToken.Span.Span, SpanTrackingMode.EdgeInclusive);
                    return;
                }
            }