improved the handling of URL enclosed in "..." or <...> (or others like that)

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@29261 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/AbstractMarkupText.java

@@ -49,6 +49,10 @@ public abstract class AbstractMarkupText {
      */
     public abstract String getText();
 
+    public char charAt(int idx) {
+        return getText().charAt(idx);
+    }
+
     /**
      * Length of the plain text.
      */
@@ -56,6 +60,14 @@ public abstract class AbstractMarkupText {
         return getText().length();
     }
 
+    /**
+     * Returns a subtext.
+     *
+     * @param end
+     *      If negative, -N means "trim the last N-1 chars". That is, (s,-1) is the same as (s,length)
+     */
+    public abstract MarkupText.SubText subText(int start, int end);
+
     /**
      * Adds a start tag and end tag at the specified position.
      *