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Default Ordering of XText Content Assistant [message #1745576]

Wed, 12 October 2016 16:10

Parsa Pourali

Messages: 210
Registered: February 2014

Senior Member

Hi,

Does anybody know: what is the default algorithm to sort/order the items in the content assistant list ? Is there any reference to look at it ?

Thanks,
Parsa

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Re: Default Ordering of XText Content Assistant [message #1745577 is a reply to message #1745576]

Wed, 12 October 2016 16:28

Christian Dietrich

Messages: 14496
Registered: July 2009

Senior Member

Hi

the extension point is ICompletionProposalComparator implemented by ICompletionProposalComparator.NaturalOrder by default

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Re: Default Ordering of XText Content Assistant [message #1745585 is a reply to message #1745577]

Wed, 12 October 2016 18:47

Parsa Pourali

Messages: 210
Registered: February 2014

Senior Member

Thanks,

What I mean was is it Alphabetically sorted or is it by the local scopes first , or sth else ? It seems that it randomly distributes the items in the list , because there is no specific sorting for it (at least to me).

Thanks,
Parsa

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Re: Default Ordering of XText Content Assistant [message #1745586 is a reply to message #1745585]

Wed, 12 October 2016 19:00

Christian Dietrich

Messages: 14496
Registered: July 2009

Senior Member

as i said it depends of the use of the comparator.

if you have a look at the code you can see

Integer relevance1 = getRelevance(o1);
Integer relevance2 = getRelevance(o2);
if (relevance1 != null && relevance2 != null) {
int res = relevance2.compareTo(relevance1);
if (res != 0) {
return res;
}
}
return o1.getDisplayString().compareToIgnoreCase(o2.getDisplayString());

that it is sorted by relevance/priority and then by display string

the priority comes from org.eclipse.xtext.ui.editor.contentassist.AbstractContentProposalProvider.createCompletionProposal(String, StyledString, Image, int, String, ContentAssistContext) in the proposal provider

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Re: Default Ordering of XText Content Assistant [message #1745588 is a reply to message #1745586]

Wed, 12 October 2016 19:13

Parsa Pourali

Messages: 210
Registered: February 2014

Senior Member

Thanks Christian,

I see, to me it is still not obvious that do they assign priority/relevance in the createCompletionProposal method . It seems that they create it based on the grammar definition and just add the objects based on what is defined in the grammar (i.e. SYNTACTIC ordering). It is not clear if there is a specific SEMANTIC ordering algorithm for the items.

Thanks anyways, I think I need to try and see to see if there is a pattern for it.

Regards,
Parsa

P.S. I don't want to implement or extend it, I just need to know if there is any syntactic ordering of items. I need to write it somewhere.

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