[antlr-interest] Can't recoginze a file start with HIDDENlexersince 3.1b1

[Johannes Luber]

Ronghui Yu schrieb:
> Hi, Jim,
>  
> Thanks very much for your help
>  
> I tried to turn backtrack off before, but failed to build the grammar
> with a lot of errors, so I have to turn it on

Did you look at
<http://www.antlr.org/wiki/display/ANTLR3/How+to+remove+global+backtracking+from+your+grammar>?

Johannes
>  
>  
>  
> ==============================
> Regards,
> Ronghui Yu
> Sierra Atlantic
> 
>     ----- Original Message -----
>     *From:* Jim Idle <mailto:jimi at temporal-wave.com>
>     *To:* Ronghui Yu <mailto:Ronghui.Yu at sierraatlantic.com>
>     *Cc:* antlr-interest at antlr.org <mailto:antlr-interest at antlr.org>
>     *Sent:* Thursday, August 28, 2008 10:59 PM
>     *Subject:* Re: [antlr-interest] Can't recoginze a file start with
>     HIDDENlexersince 3.1b1
> 
>     On Thu, 2008-08-28 at 13:29 +0800, Ronghui Yu wrote:
>>      
>>     The following is the complete implementation of CREATE DATABASE of
>>     our Sybase parser, and it shows its structures. 
>>     The text in red below was added a few days ago when I found this
>>     problem. I commented it because they would introduce some other
>>     problems. God.... 
>>     Thanks 
>>     grammar Sybase;
>>     options
>>     {
>>         language    = C;
>>         backtrack   = true;
> 
>     Hmmm - backtrack = true isn't a good idea for something like SQL (or
>     almost any production parser really) - this may be masking your
>     issue, but I will look at this for you this weekend - apologies that
>     I am too busy to look a this before then.
> 
>     Also, my own parser matches the comments in the lexer and places
>     them on their own channel. You can then look for them in the tree
>     walker if you need them.
> 
>     Jim
>>     } 
> 
>>
> 
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