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Parse DSL instances into Resource without Eclipse application [message #1730669]

Wed, 27 April 2016 14:25

Sina Madani

Messages: 151
Registered: November 2015
Location: York, UK

Senior Member

I have defined a grammar for my language. The documentation for Xtext tries to restrict you to the Eclipse/Xtext/Xtend framework. What I'd like to do is "take home" the generated code and basically use it as a stand-alone parser. I don't want to use Xtend or depend on an instance of Eclipse with an editor etc. I just want to create a stand-alone Java program (using the Java programming language, not Xtend) as a command-line compiler which takes as input a file which uses the grammar (e.g. with extension ".mydsl") and generates some code. How this generation is done is not relevant and completely independent of the Xtext/Xtend framework.
I am unable to figure out how to use the generated code to do this. I presume there is a method somewhere in the generated code which takes as input the file and then creates the XtextResource object(s). I want to get the Resource object (i.e. the one that is passed into the "doGenerate" method of MyDslGenerator.xtend). Any ideas how I can go about this? Thanks Smile

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Re: Parse DSL instances into Resource without Eclipse application [message #1730673 is a reply to message #1730669]

Wed, 27 April 2016 14:46

Christian Dietrich

Messages: 13512
Registered: July 2009

Senior Member

Hi,

have a look at

https://wiki.eclipse.org/Xtext/FAQ#How_do_I_load_my_model_in_a_standalone_Java_application.C2.A0.3F

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/xtext/
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Parse DSL instances into Resource without Eclipse application [message #1730677 is a reply to message #1730673]

Wed, 27 April 2016 15:11

Sina Madani

Messages: 151
Registered: November 2015
Location: York, UK

Senior Member

Thanks Christian. I can't believe I missed that in the FAQ.

However, I am still unsure how this can be used. Suppose that I wanted to make a new project. What files/packages do I need in order to make it work outside of the Xtext project?

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Re: Parse DSL instances into Resource without Eclipse application [message #1730680 is a reply to message #1730677]

Wed, 27 April 2016 15:14

Christian Dietrich

Messages: 13512
Registered: July 2009

Senior Member

all you need is in the your.dsl (the runtime project). if you create a java main there and run it once you can use the export -> java application wizard.

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/xtext/
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Parse DSL instances into Resource without Eclipse application [message #1730684 is a reply to message #1730680]

Wed, 27 April 2016 15:58

Sina Madani

Messages: 151
Registered: November 2015
Location: York, UK

Senior Member

OK thank you so much!

I'm encountering a slight issue with the Injector. I presume this is the org.eclipse.emf.mwe.internal.core.ast.util.Injector and not the com.google.Injector. But for some reason I get an error "The method getInstance(Class<XtextResourceSet>) is undefined for the type Injector". I also get a warning "Discouraged access: The type 'Injector' is not API (restriction on required library 'C:\Program Files\Eclipse\plugins\org.eclipse.emf.mwe.core_1.3.13.v201512160556.jar')".

                Injector injector = (Injector) new IDLStandaloneSetup().createInjectorAndDoEMFRegistration();
		XtextResourceSet resourceSet = injector.getInstance(XtextResourceSet.class);
		resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL, true);

EDIT: Never mind, I looked at the method and it's using Google Guice so it is the Google Injector I need.

[Updated on: Wed, 27 April 2016 16:03]

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