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How to change the namespace separator ? [message #1132458]

Fri, 11 October 2013 06:51

Vlad Gheorghe

Messages: 127
Registered: May 2011

Senior Member

By default, the namespace separator in xtext is '.'

Which is the correct approach to change this to other strin e.g. "::') ?

I found in xtext the following variation points:

IQualifiedNameConverter - converts between QualifiedName and String. (parser / serializer)
IQualifiedNameProvider - "Provides qualified names for EObjects."
- uses IQualifiedNameConverter

QualifiedNameValueConverter - A value converter for qualified names consisting of segments or wildcard literals separated by namespace delimiters.
- provided by IValueConverterService

Also relevant is that a reference can be realized in the grammar as *either* a String Data Type or a QualifiedName data type.

The source of my confusion is that both the default implementation of IQualifiedNameConverter and QualifiedNameValueConverter have an own definition of the namespace separator, which defaults to '.' .

Which is used for what ?

Do both have to be overriden to customize the separator ?

Are the QualifiedNames used internally encoded as strings ?
( this is from interpreting the return type of
String QualifiedNameValueConverter#toValue(String string, INode node) ) ?

Cheers,
Vlad

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Re: How to change the namespace separator ? [message #1133275 is a reply to message #1132458]

Fri, 11 October 2013 19:03

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

what about simply changing both?

btw QualifiedNameValueConverter seems to be a xbase only thingy.

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

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Re: How to change the namespace separator ? [message #1137312 is a reply to message #1133275]

Mon, 14 October 2013 12:00

Vlad Gheorghe

Messages: 127
Registered: May 2011

Senior Member

Hi Christian,

Quote:

what about simply changing both?

I've tried that, but with mixed results ( e.g. autocomplete still insists to provide '.'-separated names).

My main question is how is this supposed to be achieved *properly*.
(I can always code&fix, but I won't bother anyone on the forum with that..)

So could you kindly explain the intended use of these classes ?

Quote:

btw QualifiedNameValueConverter seems to be a xbase only thingy.

Why are you saying this ?
The full name is:
org.eclipse.xtext.conversion.impl.QualifiedNameValueConverter.class
and this is a concrete class.

It is extended by XbaseQualifiedNameValueConverter, indeed, but it's also exported from org.eclipse.xtect.

Best
Vlad

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Re: How to change the namespace separator ? [message #1137364 is a reply to message #1137312]

Mon, 14 October 2013 12:44

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

both are used as different places.

did you register the valueconverter for your qualifiedname rule?

the problem for autocompletion i dont understand.
did you debug the code...

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

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Re: How to change the namespace separator ? [message #1344126 is a reply to message #1132458]

Fri, 09 May 2014 16:21

Alvaro Miyazawa

Messages: 1
Registered: May 2014

Junior Member

I realise this thread is a bit old, but I got here with the same problem. I managed to solve this by extending the IQualifiedNameConverter.DefaultImpl as follows:

public class MyQualifiedNameConverter extends IQualifiedNameConverter.DefaultImpl {
	@Override
	public String getDelimiter() {
		return "::";
	}
}

and binding it to IQualifiedNameConverter in the language runtime module (e.g., MyDslRuntimeModule) by declaring the following method:

public Class<? extends IQualifiedNameConverter> bindIQualifiedNameConverter() {
	return MyQualifiedNameConverter.class;
}

I hope this helps.

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