You may wish to start be convincing GeoServer to support CartoCSS :) I did
make sure to ask Andrea if this was a paid effort or something he is trying
to do as a volunteer.
If you are familiar with both GeoServer CSS and CartoCSS perhaps you could
do the gap analysis? This would be required to figure out how much effort
is involved...
Jody Garnett
On Wed, Jun 11, 2014 at 7:37 PM, Ariel Nunez <[email protected]>
wrote:
> 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
>>>
>>> --
>>> ==
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>>> ==
>>>
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>>> @geowolf
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>>>
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>>>
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>>>
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>>
>>
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