Hello all,
Could this module support the CartoCSS syntax too?
https://www.mapbox.com/tilemill/docs/manual/carto/
In downstream projects (like GeoNode) it would be very helpful to be able
to be compatible with TileMill and CartoCSS.
I am not sure which other projects use the CSS syntax used in the scala
extension but from memory I think it was GeoServer specific. If GeoServer
adopts CartoCSS, perhaps we can also convince/fund QGIS to support CartoCSS
and have an excellent alternative to SLD that works in many open source
packages.
What do you think?
On Mon, Jun 9, 2014 at 5:27 AM, Jody Garnett <[email protected]> wrote:
> 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
>>
>> --
>> ==
>> GeoServer Professional Services from the experts! Visit
>> http://goo.gl/NWWaa2 for more information.
>> ==
>>
>> Ing. Andrea Aime
>> @geowolf
>> Technical Lead
>>
>> GeoSolutions S.A.S.
>> Via Poggio alle Viti 1187
>> 55054 Massarosa (LU)
>> Italy
>> phone: +39 0584 962313
>> fax: +39 0584 1660272
>> mob: +39 339 8844549
>>
>> http://www.geo-solutions.it
>> http://twitter.com/geosolutions_it
>>
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>
>
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