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how to check the condition for instance of class had been created in xtext editor [message #1807441]

Thu, 30 May 2019 08:43

Nagashree KN

Messages: 32
Registered: September 2018

Member

Hi,
I have created xtext projects using existing ecore model. There i have one condition like instance of class should be only one.
In Xtext editor on doing contrl+space it will list down the class names to be created. In my editor i want to create class instance only once, means again on doing control+space it should not show the created class name in the list only.
i am attaching images for better understanding.
Any one can please help me how i can do this kind of validations in editor.

Thanks!

Attachment: properFile.PNG
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Attachment: improperFile.PNG
(Size: 6.22KB, Downloaded 47 times)

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Re: how to check the condition for instance of class had been created in xtext editor [message #1807442 is a reply to message #1807441]

Thu, 30 May 2019 08:45

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

simply filter the proposals.
have a look what xtext generates in the abstractyourdslproposal provider and customize it to your needs
alternatively you could do the filtering inside the scopeprovider too. (might need use of nodemodelutils)

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

[Updated on: Thu, 30 May 2019 09:03]

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Re: how to check the condition for instance of class had been created in xtext editor [message #1807503 is a reply to message #1807442]

Fri, 31 May 2019 11:04

Nagashree KN

Messages: 32
Registered: September 2018

Member

Thanks for quick replay. i had a look at proposalprovider class.
i am not able achieve one thing here that is, first time on doing ctrl+space in editor it will show the list . from that list i will select one thing. now what i want is again on doing ctrl+space the one which i have created it should not shown in the list . i tried by overriding the method complete[elementname]_[Featurename]() but still it is not working.
How i can achieve this?

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Re: how to check the condition for instance of class had been created in xtext editor [message #1807505 is a reply to message #1807503]

Fri, 31 May 2019 11:08

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

There is a complete xxxx method for your reference
Override it. Have a look at what the super impl does
It calls lookupCrossReference
There are variants that have a filter
Call it with a filter you implement yourself
Instead of the always true filter

The method also has a filter method that gives you access to the current model

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

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