Hi,
in my spare time I am playing with writing a large-ish set of CSS styles
for a basemap and found
that I'm really missing code completion.
So I looked into what code mirror has to offer, and adding support for our
custom
variant of CSS is not hard and works reasonably well (for modest
ambitions), .e.g:
[image: Inline image 1]
[image: Inline image 2]
[image: Inline image 3]
Let me qualify "modest" ambitions:
- There is no CQL autocomplete support
- The list of values for a given property is not context sensitive, it
just gives you all possible values for all possible propeties
- The few function like values (url, symbol, color-map-entry) just
complete as "keyword(" and you have to add the rest manually
Of course it can be improved with some time and JS skills, but I believe
even this small contribution is a big improvement compared to no completion
at all.
Pull request here (I'll add a ticket and fix the commit before merging of
course):
https://github.com/geoserver/geoserver/pull/2283
I checked how this plays with other languages, and it seems it's not
interfering, you just get no completion on CTRL-SPACE.
Then, I looked at adding support for other languages too and ... well..
what I've found seem to require a lot of effort, at
least for SLD.
XML completion is available, but one needs to define a schema-like data
structure in JSON, and then setup
some specific codemirror initialization [1]. There is a tool [2] to
generate such description from a XSD, I gave it a very
quick check and for SLD 1.0 it generates a 200+KB json file... but then,
we'd have to generate another for SLD 1.1 too,
and figure out which schema to give the editor (not sure one can do both at
the same time, the sld namespace is shared among
SLD 1.0 and 1.1, but maybe with some hand-tweaking and some runtime
inconsistency it might be doable).
Soo... to get there one would need some extensions to StyleHandler,
CodeMirrorEditor, maybe some figuring out of the
right SLD version on the fly (since we just say "SLD") and then inject the
right large json blob into the editor.
That seems to be way too much work for spare time :-p
Oh, I also checked potential YSLD compatibility, yaml code highlighting is
available in the latest version of CodeMirror
(we'd may have to upgrade, 5.11 we're using currently does not have it) but
there is no hinting support for completion.
Mapbox styling wise, there is javascript highlight, and some javascript
completion support, but I don't see a quick way
to add completion towards a specific schema. See [3] for an example.
Anyways, two questions:
- Do you see any issue merging CSS completion support?
- Anyone interested in taking over support for completion in other
languages?
Cheers
Andrea
[1]: If interested, see the source of this example, in particular, the
"tags" variable https://codemirror.net/demo/xmlcomplete.html
[2]: http://q42jaap.github.io/xsd2codemirror/
[3]: https://codemirror.net/demo/complete.html
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