[antlr-interest] Solution to " How to have strings enclosed in " and/or ""

[Terence Parr]

On Dec 13, 2004, at 11:42 PM, matthew ford wrote:

> Hi Ter,
> Still no go,
>
> Tried upping k to 7 and got
>    // nongreedy exit test
>    if ((LA(1)=='"'||LA(1)=='&') && (true) && (true) && (true) && 
> (true) &&
> (true) && (true)) break _loop11;

Crap.  You are right.  Hmm...Oh, yeah, it seems the analysis algorithm 
simply removed double quote and & from the lookahead of the loop and 
then decided a single char is enough.  Ugh.  Ok, the analysis is hosed.

Your solution seems the only one.  Put a predicate in the loop:

( {pred}? (alt1|alt2) ) *

and it will work.

Note that ('&' 'q' 'u' 'o' 't' ';') is weird.  May I suggest """?

Ter

>
> test actionLexer.g is attached
> matthew
> ----- Original Message -----
> From: "Terence Parr" <parrt at cs.usfca.edu>
> To: <antlr-interest at yahoogroups.com>
> Sent: Monday, December 13, 2004 7:27 AM
> Subject: Re: [antlr-interest] Solution to " How to have strings 
> enclosed in
> " and/or &quot;"
>
>
>>
>> On Dec 12, 2004, at 12:34 AM, matthew ford wrote:
>>
>>> No greedy=false did no do it
>>>
>>> It generated the test
>>>
>>>    // nongreedy exit test
>>>    if ((LA(1)=='"'||LA(1)=='&') && (true)) break _loop11;
>>> but I need to match  '&' 'q' 'u' 'o' 't' ';' in order to exit not 
>>> just
>>> &
>>
>> Is k=2 or k>=5?
>>
>> 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!
>>
>>
>>
>>
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
>>
>
>
>
> Yahoo! Groups Links
>
>
>
>
> <actionLexer.g>
--
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!





 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/antlr-interest/

<*> To unsubscribe from this group, send an email to:
    antlr-interest-unsubscribe at yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/