Eclipse Community Forums: TMF (Xtext) » Weird Scope provider behavior

Help

Home

Home » Modeling » TMF (Xtext) » Weird Scope provider behavior

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

Weird Scope provider behavior [message #1053622]

Mon, 06 May 2013 22:16

Roza Ghamari

Messages: 82
Registered: January 2013

Member

Hi all,

I have a grammar like this:

Model:
(CLass)* (Inst)*
;

Class:
'class' '{'
(variables += Variable ';')*
'}'
;

Variable:
'INT' name = ID ';'
;

Inst:
class = [Class] name=ID ';'
(variableSettings += VariableSettings ';')*
';'

VariableSettings :
instance = [Inst] '.' variable=[Variable] '=' value = INT ';'
;

I am trying to write a scope provider for variables referenced in VariableSettings to be scoped to the defined variables in the class of the instance.
My scope provider is:

IScope scope_Variable_variable (Variable var, ERefrence ref){
if(var.eContainer() instanceof VariableSettings){
return Scopes.scopeFor(((VariableSettings)var.eContainer()).getClass().getVariables())

}
return null;
}

The weired behavior I see is that when I try to use context helper (Ctrl+Space) the function call to scope_Variable_variable() gets called and in the popup box correct variables are displaying. But if I write any undefined variable after '.' the error doesn't get caught and the scope function is not called.

I tried moving VariableSettings to a level higher and writing it under Model, this works fine and the scope method gets called after I put '.'!

I really don't know how to solve this problem. My model is fixed so it is not possible for me to move VariableSettings under model. Do you know how to debug this? Where are these methods get called??

Thanks!

Report message to a moderator

Re: Weird Scope provider behavior [message #1053624 is a reply to message #1053622]

Mon, 06 May 2013 23:19

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi this makes no sense to me

Why not

IScope scope_VariableSettings_variable(VariableSettings Ctx, Ereferece ref)

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

Report message to a moderator

Re: Weird Scope provider behavior [message #1053625 is a reply to message #1053624]

Mon, 06 May 2013 23:36

Roza Ghamari

Messages: 82
Registered: January 2013

Member

Hi Christian,

You are right, I am actually doing
IScope scope_VariableSettings_variable(VariableSettings Ctx, Ereferece ref)

The one I wrote was incorrect. But this doesn't get called when I am writing down! I see it's called for context assistance.

Thanks!

Report message to a moderator

Re: Weird Scope provider behavior [message #1053626 is a reply to message #1053625]

Mon, 06 May 2013 23:42

Roza Ghamari

Messages: 82
Registered: January 2013

Member

Two other thing I found out:

1. I was looking at the reflective ecore model, and I noticed that the references to instance and variable under VariableSettings is null! Regardless of a correct or incorrect parameter name.

2. Also I found out that my IScope scope_VariableSettings_instance(VariableSettings Ctx, Ereferece ref) doesn't get called neither.

Again everything is fine when I move the VariableSettings under model!

Really appreciate your help.

Roza

Report message to a moderator