IDE code completion with STRING

[iTob191]

My language has an import mechanism based on URIs represented as strings (e.g. import "http://some/uri"). I have successfully implemented a scope provider that resolves these URIs to the referenced elements. However code completion does not work because the prefix used to filter completion candidates includes the leading " while the candidates do not. To resolve this, I can of course include the quotes in all candidates in the scope, but this breaks linking using the default linking service because it automatically removes the quotes within getCrossRefNodeAsString(...) and therefore the lookup in the scope fails.

I know how to resolve this for my specific case, e.g. including quotes in the scope candidates and then using a custom linking service that does not remove the quotes before doing the scope lookup. However, to me this solution does not seem like an implementation of the specifics of my language and rather a fix/workaround for the default behavior. My question is what is the intended way in Xtext to handle this situation? Include quotes in the scope candidates or not? And depending on the answer to that, how to make either the linking or the completion work?

[LorenzoBettini]

You could customize the code completion to add the "

[cdietrich]

My blog is 1000 years old from a time where there was no ide proposal provider but the principle should be transposable to the ide one

[cdietrich]

There is also somewhere a bug about value converters in the ide proposal provider

[cdietrich]

#2574

[iTob191]

My blog is 1000 years old from a time where there was no ide proposal provider but the principle should be transposable to the ide one

Oh, I missed that. I managed to get it to work using a custom IdeCrossrefProposalProvider:

public class CustomIdeCrossrefProposalProvider extends IdeCrossrefProposalProvider {
	@Override
	protected ContentAssistEntry createProposal(IEObjectDescription candidate, CrossReference crossRef,
												ContentAssistContext context) {
		var qualifiedName = getQualifiedNameConverter().toString(candidate.getName());
		if (crossRef.getTerminal() instanceof RuleCall call) {
			if (call.getRule().getName().equals("STRING")) {
				qualifiedName = '"' + qualifiedName + '"';
			}
		}
		return getProposalCreator().createProposal(qualifiedName, context, (e) -> {
			e.setSource(candidate);
			e.setDescription(candidate.getEClass() != null ? candidate.getEClass().getName() : null);
			e.setKind(ContentAssistEntry.KIND_REFERENCE);
		});
	}
}

I like this solution a lot more than my previous approach. Thanks for the help!