clean up text_block#to_s

Author: gregors

lib/boilerpipe/document/text_block.rb

@@ -74,12 +74,15 @@ def merge_next(other)
       end
 
       def to_s
-        # "[" + offsetBlocksStart + "-" + offsetBlocksEnd + ";tl=" + tagLevel + "; nw=" + numWords + ";nwl=" + numWrappedLines + ";ld=" + linkDensity + "]\t" + (isContent ? "CONTENT" : "boilerplate") + "," + labels + "\n" + getText();
-        labels = 'null'
-        if !@labels.empty?
-          labels = "[#{@labels.to_a.join(',')}]"
+        "[#{@offset_blocks_start}-#{@offset_blocks_end};tl=#{@tag_level}; nw=#{@num_words};nwl=#{@num_wrapped_lines};ld=#{@link_density}]\t#{is_content? ? 'CONTENT' : 'BOILERPLATE'},#{labels_to_s}\n#{text}"
+      end
+
+      def labels_to_s
+        if @labels.empty?
+          'null'
+        else
+          "[#{@labels.to_a.join(',')}]"
         end
-        "[#{@offset_blocks_start}-#{@offset_blocks_end};tl=#{@tag_level}; nw=#{@num_words};nwl=#{@num_wrapped_lines};ld=#{@link_density}]\t#{is_content? ? 'CONTENT' : 'BOILERPLATE'},#{labels}\n#{text}"
       end
 
       def clone