The XImportSection in Xbase 2.4

I know that Xtext 2.4 has not been released yet, but I could not resist blogging about a very cool new feature in Xbase: improved automatic import functionalities!

Actually, import functionalities were already great when using Xbase also in previous versions of Xtext, but now they provide a much better experience for the user of your DSL! Indeed, all the import functionalities you are used to with JDT (like automatic import insertion, and organize imports) are available also for your Xbase language; these features were already available in Xtend, and they have been ported to Xbase itself.

At the time of writing, you need to get the very latest updates of Xtext 2.4, using the update site http://download.eclipse.org/modeling/tmf/xtext/updates/composite/latest/ .

Before you used to do something like

Now, you can use in your grammar the new Xbase rule: XImportSection:

In this post I’m reusing some experiments you can find here (https://github.com/LorenzoBettini/Xtext2-experiments, I had blogged about these experiments in previous posts).

If you now rerun the MWE2 generator, and make sure you merge the plugin.xml_gen with plugin.xml in the .ui project, your editor will provide some interesting features for free (if you use my examples, you can find a project wizard “New Project” => “Xtext” => “HelloInferrer Project”):

Imports with wildcards are deprecated:

use_of_wildcards_deprecated

You now have the context menu “Organize Imports” (Shift + Control + O); try that one in the presence of such deprecation warning and imports are organized for you:

after_organize_imports

Similarly, unused imports are reported as warnings:

imports_never_used

Again, use “Organize Imports” to fix that!

The new feature I like most is the automatic insertion of imports! (just like in JDT and Xtend): try to get content assist for a Java type, for instance,

code_completion

Accept a proposal and the import will be automatically inserted (instead of the fully qualified name):

code_completion2

Xtext rocks! :)

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2 thoughts on “The XImportSection in Xbase 2.4

  1. Dejan

    Hi,

    Thanks for your tutorials about xtext.

    I’m begginer in xtext. How can I transform some loop like if, for.. for example:

    IfStatement:
    ‘if’ condition=XExpression then=Block
    (=>’else’ else=Block)?;

    from xtext to java (mapping in jvmModelInferrer class)?
    Do you have some examples about it?

    Thanks a lot for black porn your help

    Best regards,
    Dejan

    Reply

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