[xtext-dev] Migration to Antlr 3.2

[Sebastian Zarnekow <Sebastian.Zarnekow@xxxxxxxxx>]

Hi everybody,

since we recently ran into several Antlr issues that turned out to be  
fixed in newer versions, we finally decided to lift Xtext 2.0 to Antlr  
3.2 (see https://bugs.eclipse.org/bugs/show_bug.cgi?id=326811).
Unfortunately Antlr 3.2 is not yet available from Eclipse Orbit.  
That's why we provide the plugin org.antlr.runtime v3.2 from the Xtext  
git repo. The generator plugin org.antlr.generator v3.2 is available  
from the github repository org.xtext.antlr.generator. You have to  
import org.antlr.runtime and org.antlr.generator into you workspace  
after pulling them from the respective repositories.

Please note: While Xtext and thereby MWE2 depend on Antlr 3.2, Xpand /  
Xtend still use Antlr 3.0.1. That implies that you need both Antlr  
versions in your target platform if you develop Xpand and Xtext in  
parallel. This is not as easy as expected. It seems to be impossible  
to have org.antlr.runtime v3.0 in your target platform and  
org.antlr.runtime v3.2 in your workspace. That's why you have to  
export org.antlr.runtime 3.2 into your target platform to make both  
versions resolvable. Let's hope that https://bugs.eclipse.org/bugs/show_bug.cgi?id=327868 
 will be fixed soon...

Happy rebasing,
Sebastian