[antlr-interest] Re: exceptions in the lexer

[Terence Parr]

On Dec 10, 2004, at 2:25 PM, Paul J. Lucas wrote:
> On Fri, 10 Dec 2004, Terence Parr wrote:
>
>> Hm...perhaps I should just make it catch ANTLRException, the root,
>> instead?
>
> 	That would work also (and should fix the problem once and for
> 	all).

Oh, I think I remember now.  Definitely had to do with 
TokenRetryException.  I wanted to be able to blast out of the lexer 
entirely on an exception to force the a token stream switch to flip to 
another lexer and retry.  If I made that part of the same hierarchy 
under RecognitionException then you couldn't do the retry.  I 
specifically made it separate.  Hmm...seems like we need it.

 From the comment on the interface, "Anything that goes wrong while 
generating a stream of tokens", I think I meant to be different than 
recognition issues.  For the life of me though, I can't remember 
expecting lexer *recognition* exceptions to make it to the parser.  
Yet, that is what the code says.  Bizarre.  The lexer should just look 
for another token.

Ok, i'll look into it.
Ter
--
CS Professor & Grad Director, University of San Francisco
Creator, ANTLR Parser Generator, http://www.antlr.org
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