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The following token definitions are unreachable: RULE_ID [message #714011]

Tue, 09 August 2011 15:30

Robin

Messages: 25
Registered: August 2010

Junior Member

Hi,

maybe someone can help me with a problem I am having.

I have the following grammar:

Content : 
	name=CONTENT_BREAKDOWN;

terminal CONTENT_BREAKDOWN :
	ID PUNCTUATION_OPT;

terminal PUNCTUATION_OPT :
	( '.' | '?' | '!')?;

I have either an ID or an ID that ends with a punctuation. If it ends with the punctuation I also want the punctuation to be matched on the name Variable of the Content object. I tried around with different structures, but I am stuck with the error "The following token definitions are unreachable: RULE_ID".

Any help would be great!

Regards, Robin

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Re: The following token definitions are unreachable: RULE_ID [message #714014 is a reply to message #714011]

Tue, 09 August 2011 15:38

Christian Dietrich

Messages: 13883
Registered: July 2009

Senior Member

hi,

terminal CONTENT_BREAKDOWN :
ID PUNCTUATION_OPT;

hides ID (since PUNCTUATION may be empty), what about using a datatype rule instead

CONTENT_BREAKDOWN :
ID PUNCTUATION_OPT;

~Christian

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Re: The following token definitions are unreachable: RULE_ID [message #714301 is a reply to message #714011]

Wed, 10 August 2011 09:26

Robin

Messages: 25
Registered: August 2010

Junior Member

Hi,

of course *facepalms self*! Thanks!! Smile

I ended up with this:

Content : 
	name=ContentBreakdown;
	
ContentBreakdown :
	ID PUNCTUATION?;

terminal PUNCTUATION :
	( '.' | '?' | '!');

I had to move the optional operator ('?') to the ContentBreakdown rule, otherwise it was always expecting a punctuation element.

Regards, Robin

[Updated on: Wed, 10 August 2011 09:27]

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