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Xtext model [message #1611517]

Wed, 11 February 2015 12:17

Luis De Bello

Messages: 95
Registered: January 2015

Member

Hi guys,

I am working with one grammar from xtext and I would like to create a tree structure based on the document, however I do not want to traverse the whole structure for every change ,so I was looking for a way of detecting the delta between one version and the next one. I used a listener IXtextModelListener but when I did resource.getContents().get(0) was giving me new objects, my expectation was to receive the same object with more children because I am modifying some leaf nodes instead of affecting the root node.

I would like to know if someone had to deal with a similar problem or if someone can provide me some lights on this.

Of course another possibility could be to keep the previous document and compare it with the new one when the listener is fired but I am not sure if that is the best way to do it

Thanks in advance

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Re: Xtext model [message #1611559 is a reply to message #1611517]

Wed, 11 February 2015 12:54

Christian Dietrich

Messages: 14668
Registered: July 2009

Senior Member

Hi,

xtext does not produce model based deltas

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

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Re: Xtext model [message #1611670 is a reply to message #1611559]

Wed, 11 February 2015 14:37

Luis De Bello

Messages: 95
Registered: January 2015

Member

Hi Christian,

Thanks for the answer, so I will have to regenerated the tree every time

Regards,
Luis

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Re: Xtext model [message #1611723 is a reply to message #1611670]

Wed, 11 February 2015 15:24

Christian Dietrich

Messages: 14668
Registered: July 2009

Senior Member

Maybe you can use the Node Model (NodeModelUtils.findActualNodeFor(object).getText() to calculate hashes for the text of model elements.
Then store the hashes in the tree nodes.
thus you could at least keep parts of the tree

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

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Re: Xtext model [message #1611729 is a reply to message #1611670]

Wed, 11 February 2015 15:26

Christian Dietrich

Messages: 14668
Registered: July 2009

Senior Member

maybe you could use hash(NodeModelUtils.findActualNodeFor(object).getText() ) to build something like that yourself

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

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