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Code generation from DSL [message #1862440]

Tue, 05 December 2023 15:08

Franz Fehringer

Messages: 7
Registered: December 2023

Junior Member

I have a very basic question for which i cannot easily find an answer with google and here it goes:
Starting with https://github.com/LorenzoBettini/packtpub-xtext-book-2nd-examples/tree/master/org.example.entities.parent i want to do the DSL to java generation from the command line using a mwe2 workflow.
There are DSL examples (MyModel.entities) in generatormain.tests and standalone.tests and there is a Xtend generator EntitiesGenerator extends AbstractGenerator. It is possible to execute the EntitiesGenerator in both test projects, but mwe2 is not used here.
Is this (doing the DSL instance(s) to Java translation in a mwe2 workflow) a reasonable target and how do i achieve it?

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Re: Code generation from DSL [message #1862444 is a reply to message #1862440]

Tue, 05 December 2023 16:08

Tamas Miklossy

Messages: 162
Registered: February 2016

Senior Member

Hello Franz!

You might take a look at the following article to get some inspiration:

https://goto40.github.io/self-dsl/xtext_deploy_command_line/

Hope that helps!
Tamás

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Re: Code generation from DSL [message #1862451 is a reply to message #1862444]

Tue, 05 December 2023 18:25

Franz Fehringer

Messages: 7
Registered: December 2023

Junior Member

Hi Tamás, this is a nice overview, but most of it is already in the LB book/code and it does not answer my question: Is there a short best practice solution utilizing a mwe2 workflow?
In fact there is a solution, i could write a generator implementing IWorkflowComponent where the generator is entered through invoke().
But that does not look like "best practice", is there perhaps something utilizing the mwe2 clauses language=, fragment=, or something i do not fully understand as of now?

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Re: Code generation from DSL [message #1862456 is a reply to message #1862451]

Wed, 06 December 2023 03:51

Christian Dietrich

Messages: 14738
Registered: July 2009

Senior Member

I am not sure if I can follow you. Why do you want to use a workflow

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
Day Job: https://www.everest-systems.com

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Re: Code generation from DSL [message #1862459 is a reply to message #1862456]

Wed, 06 December 2023 08:30

Franz Fehringer

Messages: 7
Registered: December 2023

Junior Member

A workflow can be easily executed with both eclipse and maven. And i would be a little surprised if this were not possible. If making the Generator a IWorkflowComponent is the only way to go (apart from the "standard" non mwe2 ways), then the discussion ends here.
But is it true? I know there are several non mwe2 ways to execute the generator. But i am curious about the possible mwe2 case.
What about language=, fragment=, bean=, IXtextGeneratorFragment, GeneratorComponent ...
Any possibility to latch in among them? Can IXtextGeneratorFragment, GeneratorComponent be reused by language developers or are they "internal use" only?

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Re: Code generation from DSL [message #1862461 is a reply to message #1862459]

Wed, 06 December 2023 08:48

Christian Dietrich

Messages: 14738
Registered: July 2009

Senior Member

you basically need to provide your workflow component.
or use org.eclipse.xtext.generator.GeneratorComponent

IXtextGeneratorFragment etc are for Xtext grammar file => Xtext language code.

what is the problem with
org.eclipse.xtext.generator.GeneratorComponent

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
Day Job: https://www.everest-systems.com

[Updated on: Wed, 06 December 2023 08:50]

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Re: Code generation from DSL [message #1862463 is a reply to message #1862461]

Wed, 06 December 2023 09:36

Franz Fehringer

Messages: 7
Registered: December 2023

Junior Member

There is no problem with GeneratorComponent apart from the one that it is not completely clear to me how to use it. Do you have a (simple) example? How do i (in the https://github.com/LorenzoBettini/packtpub-xtext-book-2nd-examples/tree/master/org.example.entities.parent case) get from MyModel.entities to generated Java code with the help of GeneratorComponent ?

[Updated on: Wed, 06 December 2023 09:37]

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