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Possible bug due to keywords with "special" chars [message #852165]

Sat, 21 April 2012 18:50

Massimo Rabbi

Messages: 29
Registered: November 2010
Location: Padova

Junior Member

Hi all,
during tests with my grammar I've found a strange behavior and what I think it could be a bug.
Let's take also the sample Xtext grammar for "Hello World!".
It is enough to create a new xtext project and then modify the grammar a little bit:

Model:
	greetings+=Greeting*;
	
Greeting:
	'$Hello' name=ID '!';

As you can see I've modified the keyword 'Hello' into '$Hello' but you can use for example another "special" char like for example & (ampersand).

Now after grammar generation, launch the runtime to test-it.
If you create a new file and start typing the keyword after digiting $, when you press enter H character an exception is thrown in the original workspace console. However, you can see it also opening the problems view in the runtime workspace.

This is a part of the exception.

Caused by: java.lang.IllegalArgumentException: Index out of bounds
	at org.eclipse.swt.SWT.error(SWT.java:4263)
	at org.eclipse.swt.SWT.error(SWT.java:4197)
	at org.eclipse.swt.SWT.error(SWT.java:4168)
	at org.eclipse.swt.custom.StyledText.setStyleRanges(StyledText.java:9661)
	at org.eclipse.swt.custom.StyledText.replaceStyleRanges(StyledText.java:7713)
	at org.eclipse.jface.text.TextViewer.addPresentation(TextViewer.java:4811)
	at org.eclipse.jface.text.TextViewer.changeTextPresentation(TextViewer.java:4890)
	at org.eclipse.jface.text.presentation.PresentationReconciler.applyTextRegionCollection(PresentationReconciler.java:579)
	at org.eclipse.jface.text.presentation.PresentationReconciler.processDamage(PresentationReconciler.java:568)
	at org.eclipse.jface.text.presentation.PresentationReconciler.access$3(PresentationReconciler.java:564)
	at org.eclipse.jface.text.presentation.PresentationReconciler$InternalListener.textChanged(PresentationReconciler.java:225)
	at org.eclipse.xtext.ui.editor.XtextSourceViewer.updateTextListeners(XtextSourceViewer.java:112)
	at org.eclipse.jface.text.TextViewer.invalidateTextPresentation(TextViewer.java:3467)
	at org.eclipse.jface.text.source.AnnotationPainter.invalidateTextPresentation(AnnotationPainter.java:962)
	at org.eclipse.jface.text.source.AnnotationPainter.updatePainting(AnnotationPainter.java:944)
	at org.eclipse.jface.text.source.AnnotationPainter.access$1(AnnotationPainter.java:938)
	at org.eclipse.jface.text.source.AnnotationPainter$1.run(AnnotationPainter.java:1077)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
	... 23 more

Looking in Bugzilla I found the bug 339779 (hxxps://bugs.eclipse.org/bugs/show_bug.cgi?id=339779) that was marked as CLOSED WORKFORME.
The scenario is not the same, however the error is pretty similar.

Additional details
- it occurs on both MacOSX 10.7.3 and Windows 7 64bit. The actual version of Xtext installed is 2.2.1.
- a "dirty" trick to solve this problem is to split the keyword so '$Hello' becomes '$' 'Hello', the exception in this case is not raised.

Someone else has ever verified a similar problem?

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Re: Possible bug due to keywords with "special" chars [message #852187 is a reply to message #852165]

Sat, 21 April 2012 19:23

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

i can reproduce this problem in 2.2.1
i cannot reproduce it in 2.3.0M6
could you try 2.3.0M6 too?
(milestone update site or http://download.itemis.com/distros/eclipsecon2012)
if you can reproduce it with 2.3.0M6 please file a ticket.

~Christian

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

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Re: Possible bug due to keywords with "special" chars [message #852895 is a reply to message #852187]

Sun, 22 April 2012 12:51

Massimo Rabbi

Messages: 29
Registered: November 2010
Location: Padova

Junior Member

Hi Christian,
thanks for the reply.
Just tested on my Win7 notebook with both Eclipse Indigo 3.7.2 (Xtext 2.3M6) and EclipseCon package.
As you said I was not able to reproduce it.

I suppose the problem has been fixed in the meanwhile.
Thanks.
Massimo.

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