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Xtext, eclipse Che and outline view [message #1739814]

Thu, 04 August 2016 16:53

Neil Mackenzie

Messages: 131
Registered: December 2013

Senior Member

Hi ,
regarding the in progress work of allowing xtext DSL's to be supported with eclipse Che, I was wondering if an outline view will be available (like the one available in the Eclipse IDE)?
Thanks,
Neil

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Re: Xtext, eclipse Che and outline view [message #1753043 is a reply to message #1739814]

Wed, 01 February 2017 12:01

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

i have blogged on this topic here: https://blogs.itemis.com/en/how-to-get-started-with-xtext-language-servers-and-che

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Xtext, eclipse Che and outline view [message #1753084 is a reply to message #1753043]

Wed, 01 February 2017 17:57

Neil Mackenzie

Messages: 131
Registered: December 2013

Senior Member

Thanks Christian,
I am insterested in LSP also and will try out your tutorial.
Regarding 'outline view' I mean the visual representation of the Abstract Syntax Tree that can be viewed in the eclipse desktop IDE for programs written in langauges defined by xtext (such as Xcore). I didt see the 'outline view' it mentioned in the blog (apologies if I didnt spot it!)
I think if such a feature was available in Che it would probably come from interaction with the EMF EObject API and not the LSP API.
Thanks,
Neil

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Re: Xtext, eclipse Che and outline view [message #1753105 is a reply to message #1753084]

Wed, 01 February 2017 20:48

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

xtext che support is via lsp only => only what the lsp, xtext and che all together are capable of would work

so all that i can see so far is lsp document symbol service a kind of flat outline.

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Xtext, eclipse Che and outline view [message #1753263 is a reply to message #1753105]

Fri, 03 February 2017 08:29

Neil Mackenzie

Messages: 131
Registered: December 2013

Senior Member

Thanks Christian,
I am interested in developing some visual tooling for Xtext in Che. Some visual tooling exists for Xtext with Sirius, integration with Che will be quite different technically of course. Since I am currently looking at integration approaches of EMF and Che I was hoping that I could re-use some of this. In a quick informal chat with some of the Typefox folk at EclipseCon 2016 it was suggested that using the EMF/EObject API for visual representation of the Xtext AST would be possible from Che (while still using LSP for code completion etc). I understand that using the EMF API is not the supported or suggested approach for integrating che and text, do you think it is possible to use it? alternatively If I can use LSP to get all the information I need about the Abstract Syntax tree structure (So that I can display it visually) then I may consider using the LSP API instead.
Regards,
Neil

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Re: Xtext, eclipse Che and outline view [message #1753264 is a reply to message #1753263]

Fri, 03 February 2017 08:39

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

i assume you need to extend LSP to do so. the client never gets an AST

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Xtext, eclipse Che and outline view [message #1753294 is a reply to message #1753264]

Fri, 03 February 2017 12:49

Sven Efftinge

Messages: 83
Registered: January 2016
Location: Kiel

Member

Hi Neil,

I don't know with whom of my colleagues you have talked, but you would indeed need to extend the LSP with additional functions if you want to expose AST information.
It's not hard but needs to be done on both sides (Che and Xtext). LSP4J supports this (see https://github.com/eclipse/lsp4j/blob/master/documentation/jsonrpc.md).
Also the Xtext LS allows for language specific extensions, here is an example:
https://github.com/eclipse/xtext-core/blob/master/org.eclipse.xtext.ide.tests/testlang-src/org/eclipse/xtext/ide/tests/testlanguage/ide/TestLangLSPExtension.xtend

hth,
Sven

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