🎨 Fix #12304

pom.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <!--
     Description: Solo POM.
-    Version: 3.16.1.39, Jun 2, 2017
+    Version: 3.16.1.39, Jun 3, 2017
     Author: <a href="http://88250.b3log.org">Liang Ding</a>
     Author: <a href="http://www.annpeter.cn">Ann Peter</a>
     Author: <a href="http://vanessa.b3log.org">Vanessa</a>
@@ -104,7 +104,6 @@
         <servlet.version>3.1.0</servlet.version>
         <slf4j.version>1.7.5</slf4j.version>
         <jsoup.version>1.9.1</jsoup.version>
-        <pegdown.version>1.6.0</pegdown.version>
         <flexmark.version>0.19.5</flexmark.version>
         <qiniu.version>7.0.4.1</qiniu.version>
         <jetty.version>9.2.7.v20150116</jetty.version>
@@ -176,12 +175,6 @@
             <version>${slf4j.version}</version>
         </dependency>
 
-        <dependency>
-            <groupId>org.pegdown</groupId>
-            <artifactId>pegdown</artifactId>
-            <version>${pegdown.version}</version>
-        </dependency>
-
         <dependency>
             <groupId>com.vladsch.flexmark</groupId>
             <artifactId>flexmark-all</artifactId>

src/main/java/org/b3log/solo/util/Markdowns.java

@@ -15,20 +15,23 @@
  */
 package org.b3log.solo.util;
 
+import com.vladsch.flexmark.ast.Node;
+import com.vladsch.flexmark.html.HtmlRenderer;
+import com.vladsch.flexmark.profiles.pegdown.Extensions;
+import com.vladsch.flexmark.profiles.pegdown.PegdownOptionsAdapter;
+import com.vladsch.flexmark.util.options.DataHolder;
 import org.apache.commons.lang.StringUtils;
 import org.b3log.latke.logging.Logger;
 import org.b3log.latke.util.Strings;
-import org.pegdown.Extensions;
-import org.pegdown.PegDownProcessor;
 
 /**
  * <a href="http://en.wikipedia.org/wiki/Markdown">Markdown</a> utilities.
- *
  * <p>
- * Uses the <a href="http://markdown.tautua.org/">MarkdownPapers</a> as the converter.</p>
+ * Uses the <a href="https://github.com/vsch/flexmark-java">flexmark</a> as the converter.
+ * </p>
  *
  * @author <a href="http://88250.b3log.org">Liang Ding</a>
- * @version 2.0.0.2, Nov 3, 2016
+ * @version 2.1.0.2, Jun 3, 2017
  * @since 0.4.5
  */
 public final class Markdowns {
@@ -36,7 +39,32 @@ public final class Markdowns {
     /**
      * Logger.
      */
-    private static final Logger LOGGER = Logger.getLogger(Markdowns.class.getName());
+    private static final Logger LOGGER = Logger.getLogger(Markdowns.class);
+
+    /**
+     * Built-in MD engine options.
+     */
+
+    private static final DataHolder OPTIONS = PegdownOptionsAdapter.flexmarkOptions(
+            Extensions.ALL_OPTIONALS | Extensions.ALL_WITH_OPTIONALS
+    );
+
+    /**
+     * Built-in MD engine parser.
+     */
+    private static final com.vladsch.flexmark.parser.Parser PARSER =
+            com.vladsch.flexmark.parser.Parser.builder(OPTIONS).build();
+
+    /**
+     * Built-in MD engine HTML renderer.
+     */
+    private static final HtmlRenderer RENDERER = HtmlRenderer.builder(OPTIONS).build();
+
+    /**
+     * Private constructor.
+     */
+    private Markdowns() {
+    }
 
     /**
      * Converts the specified markdown text to HTML.
@@ -50,19 +78,12 @@ public final class Markdowns {
             return "";
         }
 
-        final PegDownProcessor pegDownProcessor = new PegDownProcessor(Extensions.ALL_OPTIONALS | Extensions.ALL_WITH_OPTIONALS, 5000);
-        String ret = pegDownProcessor.markdownToHtml(markdownText);
-
+        final Node document = PARSER.parse(markdownText);
+        String ret = RENDERER.render(document);
         if (!StringUtils.startsWith(ret, "<p>")) {
             ret = "<p>" + ret + "</p>";
         }
 
         return ret;
     }
-
-    /**
-     * Private constructor.
-     */
-    private Markdowns() {
-    }
 }