Brave Move Andrea: I was thinking of doing the same thing using the eclipse
domain specific language stuff (and xtend).
So big +1 from me.
Jody Garnett
On Mon, Jun 9, 2014 at 6:12 AM, Andrea Aime <[email protected]>
wrote:
> Hi,
> as you may know in GeoServer we have a community module allowing
> to style maps using a CSS syntax:
> http://docs.geoserver.org/latest/en/user/extensions/css/index.html
>
> The module uses a Scala based parser which eventually translates the
> style into an equivalent SLD form.
>
> The scala parser has been source of some issues:
> * The module is not actively developed (last commit is 8 months old), and
> some
> pull requests have been waiting to be accepted for months
> * The number of developers proficient with Scala is quite limited
> (proficient as in,
> someone that can go and write changes to the module straight away)
> * There has been some complaint about the CSS->SLD translation performance
>
> A few months ago Jody was suggesting to fork the module and rewrite it in
> Java
> to get a larger potential maintaner base (
> http://osgeo-org.1560.x6.nabble.com/GeoTools-GeoServer-Meeting-2013-12-10-td5093533.html#a5093665).
> ..
> which is what I did in the last couple of weekends, initial results here:
> https://github.com/aaime/geotools/tree/css
>
> For the moment I have a (supposedly) complete parser for the syntax
> currently
> used by GeoServer based on the parbolied parser library
> https://github.com/sirthias/parboiled/wiki
> This library was suggested originally by David Winslow as we were talking
> about
> the possibility of a Java rewrite some months ago.
>
> The plan is to move forward and create a CSS->SLD translator in the next
> few weeks,
> trying to pay attention to performance, and see if some of the issues in
> the existing
> Scala version can be solved too, e.g., creationg of a line and polygon
> symbolizer
> when a single polygon symbolizer would do, and no use of ElseFilter for the
> rules matching "everything else".
> I'll probably have to pimp up the SimplifyingFilterVisitor a bit to
> recognize filters
> that match everything, or nothing, to do the above, which in the end will
> be
> of benefit also for all other users of the class above (e.g., stores
> translating filters
> into some sql/xml format)
>
> Feedback welcomed
>
> Cheers
> Andrea
>
> --
> ==
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> ==
>
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>
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