[antlr-interest] Problems with " and/or ""

[Terence Parr]

On Dec 14, 2004, at 11:16 PM, matthew ford wrote:
> There should be an easier (and more strightforward) way to do this.
> But if there is I have not found it yet.
> Ter can you get greedy = false to work for this case?

The unfortunate truth is that greedy=false was an afterthought and 
apparently not properly integrated.

You'll note in 3.0 that this plain works:

Q : """ (greedy=false : . )* """ ;

I just verified the generated Java (no bytecodes in this case) and the 
DFA.  Everything is cool.  It will terminate on """ and more 
importantly, it figured out the k=6 lookahead depth out all by itself. 
:)  Hooray.  Believe me when I say that I've actually gotten time to 
think before coding this time around.  1.x was a prototype.  2.x was 
done in a hurry to shut out JavaCC and was done while I was in a 
start-up working like mad.  I've been working on just the parsing 
algorithm and code generator for 1.5 years now. :)  I should have the 
error handling done in a month or two.  Then I clean up the tool and by 
May we may have a parser/lexer combo that works with no support for 
trees etc...  We may also have a prototype gui.

Ter
--
CS Professor & Grad Director, University of San Francisco
Creator, ANTLR Parser Generator, http://www.antlr.org
Cofounder, http://www.jguru.com
Cofounder, http://www.knowspam.net enjoy email again!





 
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