Eclipse Community Forums: TMF (Xtext) » Cross reference customisation

Help

Home

Home » Modeling » TMF (Xtext) » Cross reference customisation

Show: Today's Messages :: Show Polls :: Message Navigator

Cross reference customisation [message #907151]

Mon, 03 September 2012 08:00

asma geg
Messages: 5
Registered: April 2012

Junior Member

I am writing a grammar and I have two problems that I couldn't resolve.
This is the grammar :

Model:
	patterns+=(Fonction|Loop)*;
	
Fonction :
	'$FCT_'name=ID '.' field=ID ';' ;
Loop :
	'For' name=ID 'in' Table=ID ';'
	contents+=(Variable |Loop |Fonction)+
	'EndLoop';

Variable :
	'$' name=[Loop] '.' field=ID ';';

1_ My first problem is related to the customisation of the cross reference that links variable to loop. In fact, without any customisation , it is possible to write :

For i in table1;
For j in table2;
$i.attribute1;
$j.attribute2;
EndLoop
$j.attribute;   // We are not in the j-loop
EndLoop

because the cross reference refers to all the loops of the model.
However, I want the variable to refer only to the loops that contain it. I guess that this is possible by implementing a method in the scopeProvider file, but I don't know how! Any idea?

2_ The second problem is due to a conflict between the fonction and the variable. In fact, if I write

For F in table;
$F.attribute;
EndLoop

xtext returns an error because it expects to have $FCT and didn't understand that in this context, the content is a variable. What do you suggest?

Report message to a moderator

Re: Cross reference customisation [message #1006114 is a reply to message #907151]

Tue, 29 January 2013 19:26

Ian McDevitt
Messages: 27
Registered: December 2012

Junior Member

For the second problem try splitting the '$' away from the 'FCT'. Then the tokenizer will not be able to go down the wrong path when it sees $F.

Fonction :
	'$' 'FCT_' name=ID '.' field=ID ';' ;

I haven't tried this but I'm guessing it will consume the '$' and then try the next token which is 'F' and which can only be Loop reference.

Report message to a moderator

Previous Topic:	About cross references & scoping
Next Topic:	JvmModelInferrer refer to a java class not in the model

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Sun May 19 13:00:59 EDT 2013