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Restrict default cross reference scope. [message #1242440]

Sun, 09 February 2014 15:10

George P

Messages: 1
Registered: February 2014

Junior Member

Hello everybody,

I have an example myDsl Xtext grammar:

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

generate myDsl "http://www.eclipse.org/example/mydsl/MyDsl"

Model:
	loops+=Loop*;

Loop:
	For
;

For:
	'for' '('(ID varName = VarName)')' 'where' typedVar = [VarName] '>' INT
;

VarName:
	name = ID
;

The above Xtext grammar uses VarName as a cross reference for being able to refer only to variable names that were defined.

Example of myDsl file:

for (Integer s) where s > 10
for (Double b)	where b > 100
for (Long d) where //when content assist is invoked all VarName references are shown

Requirements:

1. In the example above, the last "for" should give as content assist suggestion only variable d. (not all variables) - I want to reduce the scope only per "for" declaration
2. Also if my project contains multiple myDsl files, I want to get suggestions for VarNames only from current file. - disable global scope of VarNames.

Can someone suggest an easy and clean way to achieve both requirements?

I was thinking to override the content assist for the VariabileName part (no use of cross references). However, in this case the functionality already provided by Xtext would be disabled and I have then to perform additional validation for VarNames that are used but not defined.

Many thanks!

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Re: Restrict default cross reference scope. [message #1242855 is a reply to message #1242440]

Mon, 10 February 2014 07:20

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

i am not sure what your problem is. there are many examples, blogs,... out there

Quote:

IScope scope_<RefDeclaringEClass>_<Reference>(
<ContextType> ctx, EReference ref)

IScope scope_<TypeToReturn>(<ContextType> ctx, EReference ref)

you can restrict specific cross refs scope by

scope_For_typedVar(For ctx, EReference r)

you can restrict the scope for a specific type and context by

scope_VarName(YourRoot ctx, EReference r)

collect the valid stuff to a list and your scopes.scopefor to wrap them into a scope

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

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Re: Restrict default cross reference scope. [message #1243002 is a reply to message #1242855]

Mon, 10 February 2014 11:24

Uli Merkel

Messages: 250
Registered: June 2013

Senior Member

perhaps a look at: http://xtextcasts.org/episodes/17-restricting-scope would be helpful.

There is a comment how to reduce scope to the DSL file only.

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