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generate with multiple independent grammars [message #1814171]

Thu, 05 September 2019 04:44

Eclipse User

Hello,

I try to use two independent grammars in Xtext. I updated the mwe2-file and copied the grammar, validation and generator into existing folders. I Changed names so there are no conflicts and it builds without errors.
When i want to edit in Eclipse, I just have autocompletion for the first grammar (hello world) and it doesn't generate. Second grammar doesn't work at all.
I'm not sure how to setup multiple independent grammars and how to spread the files. Both generators/validators in one folder or make extra folders for the new language?.
Is there somewhere a project to checkout?
I found https://www.eclipse.org/forums/index.php/t/1079008/ but doesn't solve my problem.
Probably it doesn't find my generator file.

Thanks
Markus

Re: generate with multiple independent grammars [message #1814172 is a reply to message #1814171]

Thu, 05 September 2019 05:02

Eclipse User

I don't know about your concrete languages but the use case is quite common.

First of all, code generation support is built in and should work out of the box. Just create a new sample language, or take one of the examples, and they should work. Then compare to yours.

Next, having multiple languages that depend on each other is also normal. There is nothing special about that. Whether you have your languages in separate plugins or prefer just one set of bundles for all languages is a matter of taste. For the latter, simply add another "language" to the XtextGenerator component in the mwe2 script.

You can find for every scenario samples in Xtext's code base. Look for example at the standard examples, or at the org.eclipse.xtext.testlanguages bundle's source.

Re: generate with multiple independent grammars [message #1814174 is a reply to message #1814172]

Thu, 05 September 2019 05:34

Eclipse User

The Eclipse GEF DOT component also covers such use cases.

https://github.com/eclipse/gef/blob/master/org.eclipse.gef.dot/src/org/eclipse/gef/dot/internal/language/GenerateDot.mwe2

Maybe it is a good starting point for you.

Re: generate with multiple independent grammars [message #1814236 is a reply to message #1814174]

Fri, 06 September 2019 05:31

Eclipse User

Hi,
thanks for the nice hints.

I tried org.eclipse.xtext.testlanguages but have the same problem. I added the mwe2-files and compiled. Same Problem.

I returned to the example in https://www.eclipse.org/forums/index.php/t/1079008/, it's more simple. As you said, just add a new "language".

At least it generates and autocompletes with the first language (hello world). The second, which i turned to be a hello world too doesn't work.
Actually my language worked as standalone but I tried with hello world.
It compiles, plugin.xml_gen looks fine, the model is created but Eclipse does nothing with the file-extension 'red'.

module org.xtext.example.mydsl.TestGen

import org.eclipse.xtext.xtext.generator.*
import org.eclipse.xtext.xtext.generator.model.project.*

var rootPath = ".."

Workflow {

component = XtextGenerator {
	configuration = {
		project = StandardProjectConfig {
		baseName = "org.xtext.example.mydsl"
		rootPath = rootPath
		runtimeTest = {
			enabled = true
		}
		eclipsePlugin = {
			enabled = true
		}
		eclipsePluginTest = {
			enabled = true
		}
		createEclipseMetaData = true
	}
	
	code = {
		encoding = "windows-1252"
		fileHeader = "/*\n * generated by Xtext \${version}\n */"
	}
}

language = StandardLanguage {
	name = "org.xtext.example.mydsl.MyDsl"
	fileExtensions = "mydsl"

	serializer = {
	generateStub = false
	}

	validator = {
		// composedCheck = "org.eclipse.xtext.validation.NamesAreUniqueValidator"
	}
	parserGenerator = {
	options = {
	ignoreCase = true
	backtrack=true
	}
	}
}

language = StandardLanguage {
	name = "org.xtext.example.mydsl.Test"
	fileExtensions = "red"

	serializer = {
		generateStub = false
	}
	validator = {
	// composedCheck = "org.eclipse.xtext.validation.NamesAreUniqueValidator"
}
	parserGenerator = {
		options = {
		ignoreCase = true
		backtrack=true
		}
	}
}
}
}

Re: generate with multiple independent grammars [message #1814240 is a reply to message #1814236]

Fri, 06 September 2019 06:03

Eclipse User

did you merge(copy) plugin.xml_gen -> plugin.xml ???

Re: generate with multiple independent grammars [message #1814241 is a reply to message #1814240]

Fri, 06 September 2019 06:08

Eclipse User

Hi,
no!!!

Re: generate with multiple independent grammars [message #1814242 is a reply to message #1814241]

Fri, 06 September 2019 06:16

Eclipse User

I doesn't help.
I copied it.
Eclipse doesn't do anything with the second file extension 'red'

Re: generate with multiple independent grammars [message #1814245 is a reply to message #1814242]

Fri, 06 September 2019 06:29

Eclipse User

can you please provide a complete hello world project

Re: generate with multiple independent grammars [message #1814246 is a reply to message #1814245]

Fri, 06 September 2019 06:44

Eclipse User

File: /org.xtext.example.mydsl/src/org/xtext/example/mydsl/MyDsl.xtext

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

Model:
	greetings+=Greeting*;
	
Greeting:
	'Hello' name=ID '!';

File: /org.xtext.example.mydsl/src/org/xtext/example/mydsl/Test.xtext

grammar org.xtext.example.mydsl.Test with org.eclipse.xtext.common.Terminals

generate test "http://www.xtext.org/example/mydsl/Test"

Model:
	greetings+=Greeting*;
	
Greeting:
	'Hello' name=ID '!';

File: /org.xtext.example.mydsl/plugin.xml

<?xml version="1.0" encoding="windows-1252"?>
<?eclipse version="3.0"?>
<plugin>
	<extension point="org.eclipse.emf.ecore.generated_package">
		<package 
			uri = "http://www.xtext.org/example/mydsl/MyDsl"
			class = "org.xtext.example.mydsl.myDsl.MyDslPackage"
			genModel = "model/generated/MyDsl.genmodel" />
	</extension>
	<extension point="org.eclipse.emf.ecore.generated_package">
		<package 
			uri = "http://www.xtext.org/example/mydsl/Test"
			class = "org.xtext.example.mydsl.test.TestPackage"
			genModel = "model/generated/Test.genmodel" />
	</extension>
</plugin>

The Mwe2 File is from above

Re: generate with multiple independent grammars [message #1814248 is a reply to message #1814246]

Fri, 06 September 2019 06:54

Eclipse User

i want something that i can try out

Re: generate with multiple independent grammars [message #1814298 is a reply to message #1814248]

Mon, 09 September 2019 02:50

Eclipse User

Hi,
here is the link. I zipped the parent directory
https://we.tl/t-XN3HB2SWgJ

Re: generate with multiple independent grammars [message #1814302 is a reply to message #1814298]

Mon, 09 September 2019 03:31

Eclipse User