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icon5.gif  Parse XExpressions [message #1697063] Mon, 01 June 2015 09:47 Go to next message
Daniel Kraus is currently offline Daniel KrausFriend
Messages: 5
Registered: June 2015
Junior Member
As part of my thesis I wrote a small DSL which describes special flowcharts. The decision nodes of those charts use the following parser rule:

	'decision' name=ValidID '{'

In my IJvmModelInferrer I map each decision to a method and set the XExpression as its body. Most of the time those expressions contain a simple if clause (sometimes switch statements) to evaluate one or more system properties and to decide which node or leaf comes next.

In order to visualize a flowchart I have to analyze the given XExpressions (and therefore parts of the AST) to draw links between nodes. A short example for this (in DSL syntax):

decision myDecision {
	if  (foo)
		return anotherDecision
		return MY_LEAF

So what I want to do is show myDecision (which I already accomplished) and have outgoing links to anotherDecision and MY_LEAF, ideally with a label "if (foo)" and "else".

What is the best or easiest way to parse my XExpressions to achieve this? I'm new to the world of EMF/Xtext/Xbase and thankful for any help or advice.

[Updated on: Tue, 02 June 2015 08:34]

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Re: Parse XExpressions [message #1697093 is a reply to message #1697063] Mon, 01 June 2015 14:02 Go to previous messageGo to next message
Sebastian Zarnekow is currently offline Sebastian ZarnekowFriend
Messages: 3109
Registered: July 2009
Senior Member
Hi Daniel,

the expressions are already parsed. I assume what you are looking for is
ILogicalContainerProvider.getAssociatedExpression(JvmIdentifiableElement) and
a means to walk the expression tree that is obtained from there.
Please check whether the XbaseSwitch or a plain xtend dispatch method
for the various expression types suite your needs.

Looking for professional support for Xtext, Xtend or Eclipse Modeling?
Find help at or xtext(@)
Twitter: @szarnekow
Re: Parse XExpressions [message #1697186 is a reply to message #1697093] Tue, 02 June 2015 08:38 Go to previous message
Daniel Kraus is currently offline Daniel KrausFriend
Messages: 5
Registered: June 2015
Junior Member
Hey Sebastian,

I'm sorry for the ambiguous wording, your assumption was correct. I was able to get the parts of those XExpressions with a dispatch method, so thanks for your food for thought!

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