fix sirthias#203, sirthias#200, sirthias#204

src/main/java/org/pegdown/Extensions.java

@@ -37,7 +37,7 @@ public interface Extensions {
 
     /**
      * All of the smartypants prettyfications. Equivalent to SMARTS + QUOTES.
-     * 
+     *
      * @see <a href="http://daringfireball.net/projects/smartypants/">Smartypants</a>
      */
     static final int SMARTYPANTS = SMARTS + QUOTES;
@@ -71,7 +71,7 @@ public interface Extensions {
      * @see <a href="http://fletcherpenney.net/multimarkdown/users_guide/">MultiMarkdown</a>
      */
     static final int TABLES = 0x20;
-    
+
     /**
      * PHP Markdown Extra style definition lists.
      * Additionally supports the small extension proposed in the article referenced below.
@@ -153,6 +153,13 @@ public interface Extensions {
      */
     static final int EXTANCHORLINKS = 0x00400000;
 
+    /**
+     * Generate anchor links for headers using complete contents of the header.
+     * Spaces and non-alphanumerics replaced by `-`, multiple dashes trimmed to one.
+     * Anchor link is added wrapping the header content as without EXTANCHORLINKS: `<h1><a name="header-a">header a</a></h1>`
+     */
+    static final int EXTANCHORLINKS_WRAP = 0x00800000;
+
     /**
      * All Optionals other than Suppress and FORCELISTITEMPARA which is a backwards compatibility extension
      *

src/main/java/org/pegdown/LinkRenderer.java

@@ -3,13 +3,14 @@
 import org.parboiled.common.StringUtils;
 import org.pegdown.ast.*;
 
-import static org.pegdown.FastEncoder.*;
-
 import java.io.UnsupportedEncodingException;
 import java.net.URLEncoder;
 import java.util.ArrayList;
 import java.util.List;
 
+import static org.pegdown.FastEncoder.encode;
+import static org.pegdown.FastEncoder.obfuscate;
+
 /**
  * A LinkRenderer is responsible for turning an AST node representing a link into a {@link LinkRenderer.Rendering}
  * instance, which hold the actual properties of the link as it is going to be rendered.
@@ -50,6 +51,20 @@ public Rendering withAttribute(String name, String value) {
         }
 
         public Rendering withAttribute(Attribute attr) {
+            int iMax = attributes.size();
+
+            // vsch: a little wasteful, a Map would be better, but we don't have too many attributes and
+            // this will not break code for those that have implemented their own derived ToHtmlSerializers.
+            for (int i = 0; i < iMax; i++) {
+                Attribute attribute = attributes.get(i);
+                if (attribute.name.equals(attr.name)) {
+                    // vsch: need to handle setting multiple classes, works for values too
+                    // concatenate them with space between values, as for class
+                    attr = new Attribute(attr.name, attribute.value + " " + attr.value);
+                    attributes.remove(i);
+                    break;
+                }
+            }
             attributes.add(attr);
             return this;
         }