[antlr-interest] Line continuation character problem

[Craig Barker]

I've looked at the example and it does make sense. Also I've not tried it yet but I see where your re-write below is going and will let you know how it goes.
 
Many thanks,
 
Craig

	-----Original Message----- 
	From: Anthony Youngman [mailto:Anthony.Youngman at ECA-International.com] 
	Sent: Thu 10/06/2004 11:14 
	To: antlr-interest at yahoogroups.com 
	Cc: 
	Subject: RE: [antlr-interest] Line continuation character problem
	
	
	Actually, following up to myself, you can probably just forget about the setlen/getlen stuff and say AMP!
	 
	Cheers,
	Wol

  _____  

	From: Anthony Youngman 
	Sent: 10 June 2004 11:09
	To: 'antlr-interest at yahoogroups.com'
	Subject: RE: [antlr-interest] Line continuation character problem
	
	
	Okay. First things first - you NEED to look up that ESC example in the manual I gave you. But now let's try to rewrite your rule.
	 
	
	STRING_LITERAL
	// string literals - the only token that can be split with an '&'.
	options {paraphrase = "a string";}
	 : '"'! (AMP{token.setlen(token.getlen()-3);}|{greedy=false;}.)* '"'!
	 ;
	 
	What this is doing is first it finds your " to start the string. Then it looks for either an AMP, or anything that doesn't match your final " (that's the point of the "greedy = false" - the . won't eat any token that matches the following token-match). And when it finds an AMP, the setlen/getlen deletes it from the STRING_LITERAL that it's building.
	 
	This probably won't compile straight off - I've almost certainly got my cases wrong, and there's probably other minor faults. But I hope I've explained clearly what it's doing, and you should be able easily to clean it up.
	 
	Cheers,
	Wol
	 
  _____  

	From: Craig Barker [mailto:cb at phoebussoftware.com] 
	Sent: 10 June 2004 10:49
	To: antlr-interest at yahoogroups.com
	Subject: RE: [antlr-interest] Line continuation character problem
	
	
	Hi Anthony,
	 
	Thanks for your input to this, it's been doing my head in!
	 
	Indeed, I've got the following worked out so far:

	options {
	 exportVocab=PVocab;
	 k=3;
	filter=AMP;
	}
	 
	protected
	AMP
	//an & and line break.
	 :  '&' '\r' '\n' {System.out.println("& HIT!");newline();}
	 ; 
	 
	STRING_LITERAL
	// string literals - the only token that can be split with an '&'.
	options {paraphrase = "a string";}
	 : '"'! (~('"'))* '"'!
	 ;
	 
	This solves the first problem very well but the second point is that I still want the STRING_LITERAL token to be passed as one token, even when it's been split over 2 or more lines.
	 
	ie:
	 
	getrec(tag,"select * from acct,x__ir &
	where acct001 = x__ir001 and &
	x__ir006 = 'V'")
	 
	Effectively I need the 3 lines of strings to be treated as 1 single STRING_LITERAL token, eg:
	 
	getrec(tag,"select * from acct,x__ir where acct001 = x__ir001 and x_ir006 = 'V'")
	 
	and unfortuately shaving the last 3 characters wouldn't always work.
	 
	Again many thanks for your help,
	 
	Cheers
	 
	Craig
	
	
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