Implement bold/italic/strike-through support.

Author: FireMasterK

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeParsingHelper.java

@@ -940,18 +940,50 @@ public static String getTextFromObject(final JsonObject textObject, final boolea
         }
 
         final StringBuilder textBuilder = new StringBuilder();
-        for (final Object textPart : textObject.getArray("runs")) {
-            final String text = ((JsonObject) textPart).getString("text");
-            if (html && ((JsonObject) textPart).has("navigationEndpoint")) {
-                final String url = getUrlFromNavigationEndpoint(((JsonObject) textPart)
-                        .getObject("navigationEndpoint"));
-                if (!isNullOrEmpty(url)) {
-                    textBuilder.append("<a href=\"").append(url).append("\">").append(text)
-                            .append("</a>");
-                    continue;
+        for (final Object o : textObject.getArray("runs")) {
+            final JsonObject run = (JsonObject) o;
+            String text = run.getString("text");
+
+            if (html) {
+                if (run.has("navigationEndpoint")) {
+                    final String url = getUrlFromNavigationEndpoint(run
+                            .getObject("navigationEndpoint"));
+                    if (!isNullOrEmpty(url)) {
+                        text = "<a href=\"" + url + "\">" + text + "</a>";
+                    }
+                }
+
+                final boolean bold = run.has("bold")
+                        && run.getBoolean("bold");
+                final boolean italic = run.has("italics")
+                        && run.getBoolean("italics");
+                final boolean strikethrough = run.has("strikethrough")
+                        && run.getBoolean("strikethrough");
+
+                if (bold) {
+                    textBuilder.append("<b>");
+                }
+                if (italic) {
+                    textBuilder.append("<i>");
+                }
+                if (strikethrough) {
+                    textBuilder.append("<s>");
+                }
+
+                textBuilder.append(text);
+
+                if (strikethrough) {
+                    textBuilder.append("</s>");
+                }
+                if (italic) {
+                    textBuilder.append("</i>");
+                }
+                if (bold) {
+                    textBuilder.append("</b>");
                 }
+            } else {
+                textBuilder.append(text);
             }
-            textBuilder.append(text);
         }
 
         String text = textBuilder.toString();
@@ -991,7 +1023,7 @@ public static String getAttributedDescription(
         final StringBuilder textBuilder = new StringBuilder();
         int textStart = 0;
 
-        for (final Object commandRun: commandRuns) {
+        for (final Object commandRun : commandRuns) {
             if (!(commandRun instanceof JsonObject)) {
                 continue;
             }