array slicing works different in ruby than in python

ryanking · ryanking · commit f744e7d16025 · 2008-08-29T21:09:02.000Z
--HG--
extra : convert_revision : svn%3Aacbfec75-9323-0410-a652-858a13e371e0/trunk%401205
diff --git a/lib/html5/tokenizer.rb b/lib/html5/tokenizer.rb
@@ -287,8 +287,8 @@ def data_state
       else
         chars = @stream.chars_until(["&", "<", ">", "-"])
         @token_queue << {:type => :Characters, :data => data + chars}
-        @lastFourChars += (chars[-4, 4] || '').scan(/./)
-        @lastFourChars = @lastFourChars[-4, 4] || []
+        @lastFourChars += (chars[(-4 || chars.length), 4] || '').scan(/./)
+        @lastFourChars = @lastFourChars[(@lastFourChars.length > 4 ? -4 : -@lastFourChars.length), 4] || []
       end
       return true
     end
