Eclipse Community Forums: TMF (Xtext) » problem combining importURI and importNamespace

Help

Home

Home » Modeling » TMF (Xtext) » problem combining importURI and importNamespace

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

problem combining importURI and importNamespace [message #759101]

Sat, 26 November 2011 11:29

Phil R

Messages: 99
Registered: September 2011

Member

Hi,

I'm trying to let the user define explicitly which files should be used by an include keyword.
Within those files are namespaces defined, the user should be able to import namespaces from the files that are defined.

in other words, how to disable the cross reference between files for namespaces, unless it is stated by the importURI?

I have also a second question which is a bit harder,
The scope of the namespaces should be in a chronological order,

for example 2 namespaces are already defined, A B :

namespace D {
  using namespace A
  // namespace A available
  using namespace B
  // namespace A and B available
}

Is this order of scoping possible in Xtext?

Regards,
Phil

[Updated on: Sun, 11 December 2011 17:03]

Report message to a moderator

Re: problem combining importURI and importNamespace [message #759123 is a reply to message #759101]

Sat, 26 November 2011 15:16

Meinte Boersma

Messages: 434
Registered: July 2009
Location: Leiden, Netherlands

Senior Member

The ImportURIScopingFragment (or rather: the scope provider implementations it binds) provides you with the automagical behavior which you want to forbid. So, you have to implement a custom scope provider (covered in the Reference Manual) which limits the scoping to what's intended. Luckily, you can have much of the magical functionality for free by having Guice inject the implementations and filtering the results from that. Also, Xtext's IScope API is hierarchical so you can have a "Hanoi tower" of scopes with the higher levels shadowing the lower levels.

Xtext blogs: executable models...again? | workshop material | custom scoping with Xtend

Report message to a moderator