Add BasedOn style property and fix duplicate styles (#32)

- Add based on property when generating styles from LCM
stylesheet that have based on specified in FLEx. (LT-21769)

- Edit styleDictionary to store individual styles
instead of groups of styles.

- Revise AddStyles so it adds each style one time only,
using the stylenames instead of css classes as the
dictionary keys.

NOTE: In the Word export, the style dictionary should save
each style individually rather than a collection of
styles associated with a given css class.
Otherwise, any given style may be added to the styles xml
multiple times, once for each css class using that style.

Remaining task:
- Homograph-Number style is still being duplicated. It is
handled in a different function and requires its own fix.

Src/xWorks/LcmWordGenerator.cs

@@ -36,7 +36,7 @@ public class LcmWordGenerator : ILcmContentGenerator, ILcmStylesGenerator
 	{
 		private LcmCache Cache { get; }
 		private static Styles _styleSheet { get; set; } = new Styles();
-		private static Dictionary<string, Styles> _styleDictionary = new Dictionary<string, Styles>();
+		private static Dictionary<string, Style> _styleDictionary = new Dictionary<string, Style>();
 		private ReadOnlyPropertyTable _propertyTable;
 		internal const int maxImageHeightInches = 1;
 		internal const int maxImageWidthInches = 1;
@@ -129,17 +129,16 @@ public static void SavePublishedDocx(int[] entryHvos, DictionaryPublicationDecor
 					stylePart = AddStylesPartToPackage(fragment.DocFrag);
 
 					// Add generated styles into the stylesheet from the dictionary
-					foreach (var stylesItem in _styleDictionary.Values)
+					foreach (var style in _styleDictionary.Values)
 					{
-						foreach (var style in stylesItem.Descendants<Style>())
-							_styleSheet.AppendChild(style.CloneNode(true));
+						_styleSheet.AppendChild(style.CloneNode(true));
 					}
 
 					// Clone styles from the stylesheet into the word doc's styles xml
 					stylePart.Styles = ((Styles)_styleSheet.CloneNode(true));
 
 					// clear the dictionary
-					_styleDictionary = new Dictionary<string, Styles>();
+					_styleDictionary = new Dictionary<string, Style>();
 
 					// clear the styleSheet
 					_styleSheet = new WP.Styles();
@@ -1301,32 +1300,37 @@ public void AddGlobalStyles(DictionaryConfigurationModel model, ReadOnlyProperty
 		}
 		public string AddStyles(ConfigurableDictionaryNode node)
 		{
+			// The css className isn't important for the Word export.
+			// Styles should be stored in the dictionary based on their stylenames.
+			// Generate all styles that are needed by this class and add them to the dictionary with their stylename as the key.
 			var className = $".{CssGenerator.GetClassAttributeForConfig(node)}";
 
 			lock (_styleDictionary)
 			{
 				var styleContent = WordStylesGenerator.CheckRangeOfStylesForEmpties(WordStylesGenerator.GenerateWordStylesFromConfigurationNode(node, className, _propertyTable));
-				// TODO: for testing, let it return className even if no styles are non-empty. Eventually, probably want to return null in that case?
 				if (styleContent == null)
 					return className;
 				if (!styleContent.Any())
-				{
-					return className;
-				}
-				if (!_styleDictionary.ContainsKey(className))
-				{
-					_styleDictionary[className] = styleContent;
 					return className;
-				}
-				// If the content is the same, then do nothing
-				if (WordStylesGenerator.AreStylesEquivalent(_styleDictionary[className], styleContent))
+
+				foreach (Style style in styleContent.Descendants<Style>())
 				{
-					return className;
+					string styleName = style.StyleId;
+					if (!_styleDictionary.ContainsKey(styleName))
+					{
+						_styleDictionary[styleName] = style;
+					}
+					// If the content is the same, we don't need to do anything--the style is alread in the dictionary.
+					// But if the content is NOT the same, re-name this style and add it to the dictionary.
+					else if (!WordStylesGenerator.AreStylesEquivalent(_styleDictionary[styleName], style))
+					{
+						// Otherwise get a unique but useful style name and re-name the style
+						styleName = GetBestUniqueNameForNode(_styleDictionary, node);
+						style.StyleId = styleName;
+						style.StyleName = new StyleName() { Val = styleName };
+						_styleDictionary[styleName] = style;
+					}
 				}
-				// Otherwise get a unique but useful class name and re-generate the style with the new name
-				className = GetBestUniqueNameForNode(_styleDictionary, node);
-				_styleDictionary[className] = WordStylesGenerator.CheckRangeOfStylesForEmpties(WordStylesGenerator.GenerateWordStylesFromConfigurationNode(node, className, _propertyTable));
-				//var styleName = _styleDictionary[className].
 				return className;
 			}
 		}
@@ -1496,7 +1500,7 @@ public static Drawing CreateImage(WordprocessingDocument doc, string filepath, s
 		/// have the same class name, but different style content. We want this name to be usefully recognizable.
 		/// </summary>
 		/// <returns></returns>
-		public static string GetBestUniqueNameForNode(Dictionary<string, Styles> styles, ConfigurableDictionaryNode node)
+		public static string GetBestUniqueNameForNode(Dictionary<string, Style> styles, ConfigurableDictionaryNode node)
 		{
 			Guard.AgainstNull(node.Parent, "There should not be duplicate class names at the top of tree.");
 			// First try appending the parent node classname.

Src/xWorks/WordStylesGenerator.cs

@@ -116,6 +116,9 @@ internal static Style GenerateWordStyleFromLcmStyleSheet(
 			var parProps = new ParagraphProperties();
 			var runProps = new StyleRunProperties();
 
+			if (exportStyleInfo.BasedOnStyle?.Name != null)
+				exportStyle.BasedOn = new BasedOn() { Val = exportStyleInfo.BasedOnStyle.Name };
+
 			// Create paragraph and run styles as specified by exportStyleInfo.
 			// Only if the style to export is a paragraph style should we create paragraph formatting options like indentation, alignment, border, etc.
 			if (exportStyleInfo.IsParagraphStyle)
@@ -456,6 +459,7 @@ private static Style GenerateWordStyleFromWsOptions(ConfigurableDictionaryNode c
 				wsStyle.Append(new BasedOn() { Val = configNode.Style });
 
 				wsStyle.StyleId = configNode.Style + wsString;
+				wsStyle.StyleName = new StyleName(){ Val = wsStyle.StyleId };
 
 				if (!IsEmptyStyle(wsStyle))
 					return wsStyle;
@@ -561,6 +565,7 @@ private static Styles GenerateWordStylesForWritingSystemPrefix(ConfigurableDicti
 			var styleRules = new Styles();
 			var wsRule1 = GetOnlyCharacterStyle(GenerateWordStyleFromLcmStyleSheet(WritingSystemStyleName, 0, configNode, propertyTable));
 			wsRule1.StyleId = (string.Format("{0}.{1}", baseSelection, WritingSystemPrefix)).Trim('.');
+			wsRule1.StyleName = new StyleName() { Val = wsRule1.StyleId };
 			styleRules = AddRange(styleRules, wsRule1);
 
 			// TODO: Determine how to handle after content in Word export (can't add content via a style)
@@ -871,8 +876,8 @@ public static Styles CheckRangeOfStylesForEmpties(Styles rules)
 			return null;
 		}
 
-		public static bool AreStylesEquivalent(Styles first,
-			Styles second)
+		public static bool AreStylesEquivalent(Style first,
+			Style second)
 		{
 			// OuterXml gets the markup that represents the current element and all of its child elements.
 			// All styles and style specification added to the styles element will be its children;