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INT terminal rule for negative values [message #907988]

Tue, 04 September 2012 14:00

Robert Wild

Messages: 33
Registered: August 2012

Member

Hi,

is there a way to use negative values with the builtin terminal rule 'INT'? It only seems to accept numbers without a leading minus.

I can build something like this:

SignedInt:
	sign=('-')? value=INT
;

But this does not behave very intuitively in ContentAssist, and the sign has to be parsed manually.

So, is there a better way to do that?

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Re: INT terminal rule for negative values [message #908859 is a reply to message #907988]

Thu, 06 September 2012 06:09

Alexander Nittka

Messages: 1193
Registered: July 2009

Senior Member

Hi,

this is what datatype rules are for.

SignedInt returns ecore::EInt: '-'? INT;

look at the Terminals grammar as you will have to import the Ecore for referencing the return type.

Alex

Need training, onsite consulting or any other kind of help for Xtext?
Go visit http://xtext.itemis.com or send a mail to xtext@itemis.de

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Re: INT terminal rule for negative values [message #909036 is a reply to message #908859]

Thu, 06 September 2012 12:52

Robert Wild

Messages: 33
Registered: August 2012

Member

That works fine. Thank you.

To get the contentAssist to propose something one needs to add this to ProposalProvider:

	public void complete_SignedInt(EObject model, RuleCall ruleCall, ContentAssistContext context, ICompletionProposalAcceptor acceptor) {
		complete_INT(model, ruleCall, context, acceptor);
	}

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