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/MarkupText.java

@@ -89,6 +89,18 @@ public class MarkupText extends AbstractMarkupText {
             }
         }
 
+        public SubText(int start, int end) {
+            this.start = start;
+            this.end = end;
+            groups = new int[0];
+        }
+
+        @Override
+        public SubText subText(int start, int end) {
+            return MarkupText.this.subText(this.start+start,
+                    end<0 ? this.end+1+end : this.end+end);
+        }
+
         @Override
         public String getText() {
             return text.substring(start,end);
@@ -224,6 +236,16 @@ public class MarkupText extends AbstractMarkupText {
         return text;
     }
 
+    /**
+     * 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 SubText subText(int start, int end) {
+        return new SubText(start, end<0 ? text.length()+1+end : end);
+    }
+
     @Override
     public void addMarkup( int startPos, int endPos, String startTag, String endTag ) {
         rangeCheck(startPos);