Tool to parse and compare two CSS stylesheets [closed]

Does anyone know of a good tool that can parse and compare two CSS stylesheets in order to find which selectors have different styles?

I cannot use a standard diff-like tool because the two CSS files have very different layout. I need a tool that can parse and understand the CSS, then look for selectors that actually have different styles in the two stylesheets.

The only tool I've found is the CSS Comparer from Alan Hart, however it gets confused when there are styles that apply to multiple selectors.

Solution 1:

Here's what I ended up doing, in case someone else has the same problem:

1. I used CSSTidy to "normalize" the two stylesheets I wanted to compare. Normalization in my case meant splitting multiple selectors and sorting selectors and properties. An online version of CSSTidy is available here.
2. After this, I used the CSS Comparer tool from Alan Hart to find out differences between the two stylesheets.

This did the job for my specific requirements.

Solution 2:

I tried using CSS Compare. It seems to do exactly what you are looking for. However, it seems to have some issues with multiple selectors. The nice part is that it is command-line driven, so you can set up an automated process if you have lots of CSS files, or you can chain the CSS files together to compare them to one giant resultant SASS file. This tool will show you all the differences, including differences in the values of the classes.

What would be really nice if a tool showed you which styles overrode other styles in the same stylesheet. Many old sites have lots of baggage in this way and filtering it out would be great. Of course, an automated tool might cause issues, but at least something that generates a report like Firebug does, except for every selector and for the entire collection of CSS files, would be great. Sadly CSS Compare is not such a tool, and I don't know of one:(