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How get XtextEditor starting from a node of document AST? [message #1021651]

Wed, 20 March 2013 13:09

Marco Naddeo

Messages: 62
Registered: November 2012

Member

Hi.

Starting from any node of the AST model representing an XtextDocument, is there a way to obtain the XtextEditor in which this document is opened for editing?

I need this because, on changes to AST model by user typing, I'd want to trigger some ui actions in the editor.

Thanks in advance,
Marco

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Re: How get XtextEditor starting from a node of document AST? [message #1021818 is a reply to message #1021651]

Wed, 20 March 2013 18:22

Christian Dietrich

Messages: 14670
Registered: July 2009

Senior Member

Hi,

am not quite sure why you need an XtextEditor. can you please elaborate how you get the xtext document and how you listen to changes and what kind of action you want to trigger?

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

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Re: How get XtextEditor starting from a node of document AST? [message #1021905 is a reply to message #1021818]

Wed, 20 March 2013 22:55

Steve Kallestad

Messages: 62
Registered: March 2013

Member

It sounds to me like you have a document node, and you want to get to the top level of the document to reference another part. For example:

blog:
 author : Steve
 url : http://www.steve.com

article:
 title : how to get poor quickly
 date : 1/1/2013

article: 
 title : I don't understand this jargon just yet
 date : 3/25/2013

You have a reference to a title node, and you want to get to the root node of the file so you can figure out who the author is.

There are a couple of ways to do it.

1st and I think more recommended than trying to parse the entire tree is to use cross-references. There's a good series of articles here on how it works http://blogs.itemis.de/stundzig/archives/773. It took me a little while to grasp all the jargon - being new to xtext, but if your patient enough to absorb it, there's a lot of good information in there.

Otherwise, I *think* from a given node, you can get it's Container with node.eContainer(). You'll want to write a recursive function that follows the eContainer objects until you get to the root. (eContainer().eContainer().eContainer() ... )

I'm no expert, but if it was me, I'd throw a little code together, run it through the debugger and see if I couldn't find a way to navigate.

XText is based on EMF, so you might want to look through EMF Modelling documentation and other resources on how to navigate a model.

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