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Generating code automatically on the basis of Xtext grammar [message #1778134]

Mon, 11 December 2017 07:40

Albert Houston

Messages: 8
Registered: December 2017

Junior Member

Hello.

I use Xtext to create my own DSL, and it works fine to define its structure and validate it.
Very useful function would be possibility to automatically generate DSL code regarding grammar. I mean, if I have following grammar written in Xtext, for example a rule:

Protocol :
     'protocol' '=' (protocol = PROTOCOL_TYPE)+ ';'

where PROTOCOL_TYPE is terminal with some types like 'http', 'ssh', etc., I want to create new Protocol instance calling something like that:

protocol = new Protocol("http","https");

to obtain following output/generated code:

 
protocol = http, https;

Is there any possibility to obtain such effect? Is it possible using Xtext Java classes/interfaces?

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Re: Generating code automatically on the basis of Xtext grammar [message #1778177 is a reply to message #1778134]

Mon, 11 December 2017 13:45

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

you can use ISerializer or Resource.save to serialize a ast to a model file.
can you give more context "where" you want to do such a transformation?

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

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Re: Generating code automatically on the basis of Xtext grammar [message #1778183 is a reply to message #1778177]

Mon, 11 December 2017 13:56

Albert Houston

Messages: 8
Registered: December 2017

Junior Member

Thanks for reply, I will check what did you described.
I have Eclipse SWT user interface to collect data via textboxes, checkboxes etc., and then, it is necessary to convert that data into my DSL syntax. So, I plan to connect my SWT application with Xtext application. in other words, not manually hard-coding my DSL content, but "coding" by entering data into GUI and then, Xtext dependencies would "wrap" it with grammar and DSL stuff.

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Re: Generating code automatically on the basis of Xtext grammar [message #1778184 is a reply to message #1778183]

Mon, 11 December 2017 13:57

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

creating a resource, adding the ast object to it, and call save should do the trick

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

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Re: Generating code automatically on the basis of Xtext grammar [message #1778227 is a reply to message #1778184]

Tue, 12 December 2017 07:15

Albert Houston

Messages: 8
Registered: December 2017

Junior Member

Can you pass some example how to correctly create such resource? Considering ISerializer, I found that class is rather deprecated.

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Re: Generating code automatically on the basis of Xtext grammar [message #1778229 is a reply to message #1778227]

Tue, 12 December 2017 07:32

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

// pseudo code
URI uri = URI.createURI("platform:/resource/myproject/myfolder/demo.mydsl")
IResourceSetProvider resourceSetProvider = IResourceServiceProvider.Registry.INSTANCE.getResourceServiceProvider(uri).get(IResourceSetProvider.class);
ResourceSet resourceSet = resourceSetProvider.get(project);
Resource r = resourceSet.createResource(uri);

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

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