src/StructuredLogViewer/Controls/Classifier.cs

using System;
using System.Diagnostics;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Media;
using Microsoft.Language.Xml;

namespace StructuredLogViewer
{
    public class Classifier
    {
        private static readonly SolidColorBrush[] brushes = new[]
        {
            null, // None
            Brushes.Red, // XmlAttributeName
            null, // XmlAttributeQuotes
            Brushes.Blue, // XmlAttributeValue
            Brushes.Gray, // XmlCDataSection
            Brushes.Green, // XmlComment
            Brushes.Blue, // XmlDelimiter
            Brushes.Red, // XmlEntityReference
            Brushes.Firebrick, // XmlName new SolidColorBrush(Color.FromRgb(163, 21, 21))
            Brushes.Gray, // XmlProcessingInstruction
            null, // XmlText
        };

        public void Classify(RichTextBox richTextBox, string text)
        {
            var document = richTextBox.Document;
            Paragraph paragraph = new Paragraph();
            document.Blocks.Add(paragraph);

            if (!Utilities.LooksLikeXml(text))
            {
                paragraph.Inlines.Add(text);
                return;
            }

            var contentStart = document.ContentStart;

            var sw = Stopwatch.StartNew();
            var root = Parser.ParseText(text);
            var elapsed = sw.Elapsed;
            sw = Stopwatch.StartNew();
            ClassifierVisitor.Visit(root, 0, text.Length, (start, length, node, classification) =>
            {
                var brush = brushes[(int)classification];

                var inline = new Run(text.Substring(start, length));
                if (brush != null)
                {
                    inline.Foreground = brush;
                }

                paragraph.Inlines.Add(inline);
            });
            elapsed = sw.Elapsed;
        }
    }
}