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How to know where content assist is invoked? [message #998640]

Thu, 10 January 2013 12:01

Latha Shankara

Messages: 33
Registered: June 2012

Member

Hi,

I have a issue with content assist where in I want to know where exactly the content assist is invoked.
I have a model which has an element which has 4 different attributes, eg:

addData{

numberA = a+e;
numberB = b-f*h;
numberC = c;
numberD = d;

}

a, b, c, d, f, h are constants with some values.
addData is the element, having numberA, numberB, numberC, numberD as its attributes.

I have to make sure that the first element is not negative for numberA and numberB attributes. I have overridden the appropriate method to filter the proposals. But how do I get to know for which attribute content assist was invoked for me to provide correct proposals? Is there a way to get this info?

Thanks in advance,
Latha

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Re: How to know where content assist is invoked? [message #998660 is a reply to message #998640]

Thu, 10 January 2013 13:02

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

HI,

how does your grammar look like. you can find stuff like the node model, the ast etc in the contentassistcontext. you may have to trick somehow depending on the grammar

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

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Re: How to know where content assist is invoked? [message #999000 is a reply to message #998660]

Fri, 11 January 2013 06:07

Latha Shankara

Messages: 33
Registered: June 2012

Member

Hi Christian,

I found that I can get to know the attribute of the element where content assist was invoked by getting the previous nodes of the lastcompleteNode of the context.

I get the last completed node by using,

INode node = contentAssistContext.getLastCompleteNode();

But how do I get the previous node of lastCompleteNode?

While debugging, the lastCompleteNode has properties like prev, next and so on.. Is there a way to get the prev property? I was not able to find any method to get the same.

Thanks,
Latha

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Re: How to know where content assist is invoked? [message #999033 is a reply to message #999000]

Fri, 11 January 2013 07:31

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

You can ask the node for its grammar element. (You may have to
downcast)

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

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Re: How to know where content assist is invoked? [message #999045 is a reply to message #999033]

Fri, 11 January 2013 08:13

Latha Shankara

Messages: 33
Registered: June 2012

Member

Yes, I can get the grammar element. But my requirement is different.

If I have code like below,

addData{

numberA = <Ctrl+Space>

}

Then, the current node is hidden leaf node which is a space, last complete node is "=" which is a keyword. The prev property of the last complete node would be the keyword numberA which I am in need of. By the grammar element of the last complete node I get "=" and not "numberA". How do I get previous node to lastCompleteNode?

Thanks,
Latha

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Re: How to know where content assist is invoked? [message #999055 is a reply to message #999045]

Fri, 11 January 2013 08:33

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi can't you ask the node for its previous. BTW posting a grammar
(simplyfied) would make it much easier to help

--
Need training, onsite consulting or any other kind of help for Xtext?
Go visit http://xtext.itemis.com or send a mail to xtext at itemis dot de

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

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