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Custom error message for unordered groups [message #1006306]

Wed, 30 January 2013 13:35

Eclipse User

Hi,

since the normal error message for incomplete unordered groups is not really helpful for the user, I would like to change it to a more meaningful.
SyntaxErrorMessageProvider is the way to go, I know so far, but there are hardly any examples or existing documentation which helped me so far.
Has anyone already succesfully changed this kind of error msg?

Re: Custom error message for unordered groups [message #1006316 is a reply to message #1006306]

Wed, 30 January 2013 14:27

Eclipse User

Hi,

if your are in such a situation the use of the the debugger is always a good starting point.
this will show:
- org.eclipse.xtext.parser.antlr.AbstractInternalAntlrParser.UnorderedGroupErrorContext.getDefaultMessage() is called
- this calls getRecognitionException and getRecognitionException
- the first one delivers a FailedPredicateException which contains the message info for the exception
- but there is other stuff to call too. e.g. getMissingMandatoryElements

The rest is up to you Wink

~Christian

Re: Custom error message for unordered groups [message #1006331 is a reply to message #1006316]

Wed, 30 January 2013 16:17

Eclipse User

Big thanks! I was able to change the error msg now.
Here is the code, for all which are interested:

class EfvmSyntaxErrorMessageProvider extends SyntaxErrorMessageProvider {

	public static String INCOMPLETE_UNORDERED_GROUP = "INCOMPLETE_UNORDERED_GROUP";

	@Override
	public SyntaxErrorMessage getSyntaxErrorMessage(IParserErrorContext context) {
		if (context.getRecognitionException() instanceof FailedPredicateException) {
			return new SyntaxErrorMessage(
					"The following elements are necassary for an adapter inctance: Name, Tool and Model",
					INCOMPLETE_UNORDERED_GROUP);
		}
		return super.getSyntaxErrorMessage(context);
	}
}

You talked about getMissingMandatoryElements ect. - in which case and how could I use this?

Cheers

Re: Custom error message for unordered groups [message #1006335 is a reply to message #1006331]

Wed, 30 January 2013 16:29

Eclipse User

What about if you have 10 unordered groups, or you want to say what exactly is missing

[Updated on: Wed, 30 January 2013 16:29] by Moderator

Re: Custom error message for unordered groups [message #1006343 is a reply to message #1006335]

Wed, 30 January 2013 17:29

Eclipse User

You're right, but how should I access this methods from IParserErrorContext? UnorderedGroupErrorContext is a subclass of ParserErrorContext. Or am I wrong?

Re: Custom error message for unordered groups [message #1006345 is a reply to message #1006343]

Wed, 30 January 2013 17:40

Eclipse User

UnorderedGroupErrorContext extends ParserErrorContext implements IUnorderedGroupErrorContext

Re: Custom error message for unordered groups [message #1006348 is a reply to message #1006345]

Wed, 30 January 2013 18:09

Eclipse User

Sry, I don't get it, how to access UnorderedGroupErrorContext from IParserErrorContext..It's a little bit confusing for me right now..
You mean something like: if (context.getRecognitionException() instanceof IUnorderedGroupErrorContext) ??

Re: Custom error message for unordered groups [message #1006350 is a reply to message #1006348]

Wed, 30 January 2013 18:22

Eclipse User

yes downcast to IUnorderedGroupErrorContext

Re: Custom error message for unordered groups [message #1006440 is a reply to message #1006350]

Thu, 31 January 2013 06:11

Eclipse User

OK, I've got my AbstractElements now, but I don't now how to make the type check. This doesn't work:

if( abstractelment instanceof ConfigurationName){
dosomething...
}

Where ConfigurationName is a mandatory element of the unordered group.

Re: Custom error message for unordered groups [message #1006445 is a reply to message #1006440]

Thu, 31 January 2013 06:22

Eclipse User

Hi I cannot say what to do (doing your work) so use the debugger and
see what you get

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