Implement bold font; make tests pass again.

- NEU: Überschriften und pathologische Werte werden fett gedruckt.
- FIX: Kleinere Bugfixes.

zaaReloaded2/Formatter/DocumentWriter.cs

@@ -20,6 +20,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using Microsoft.Office.Interop.Word;
+using System.Text.RegularExpressions;
 
 namespace zaaReloaded2.Formatter
 {
@@ -59,6 +60,20 @@ namespace zaaReloaded2.Formatter
         /// </summary>
         public string ParagraphStyle { get; set; }
 
+        /// <summary>
+        /// Returns text without markup from the buffer.
+        /// </summary>
+        public string Text
+        {
+            get
+            {
+                if (!HasBufferedText)
+                    throw new InvalidOperationException("This DocumentWriter does not have any text.");
+
+                return _markupRegex.Replace(_buffer.ToString(), String.Empty);
+            }
+        }
+
         #endregion
 
         #region Constructors
@@ -126,7 +141,7 @@ namespace zaaReloaded2.Formatter
                 {
                     s.set_Style(ParagraphStyle);
                 }
-                s.Range.Text = _buffer.ToString();
+                MarkupToDocument(_buffer.ToString());
             }
             if (Parent != null)
             {
@@ -166,9 +181,40 @@ namespace zaaReloaded2.Formatter
 
         #endregion
 
+        #region Private methods
+
+        /// <summary>
+        /// Parses a string containing markup (e.g., "&lt;b&gt;", "&lt;/b&gt;")
+        /// and writes formatted text to the current Document.
+        /// </summary>
+        /// <param name="text"></param>
+        void MarkupToDocument(string text)
+        {
+            string[] substrings = _markupRegex.Split(text);
+            foreach (string substring in substrings)
+            {
+                switch (substring)
+                {
+                    case "<b>":
+                        Document.ActiveWindow.Selection.Font.Bold = 1;
+                        break;
+                    case "</b>":
+                        Document.ActiveWindow.Selection.Font.Bold = 0;
+                        break;
+                    default:
+                        Document.ActiveWindow.Selection.TypeText(substring);
+                        break;
+                }
+            }
+        }
+
+        #endregion
+
         #region Fields
 
         StringBuilder _buffer;
+        // Put pattern in parentheses so they will not be discarded by Regex.Split
+        static readonly Regex _markupRegex = new Regex(@"(</?b>)");
 
         #endregion
     }