lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Grant Ingersoll <gsing...@apache.org>
Subject Query Parsing was Fwd: Lab - Esqueranto
Date Fri, 25 Sep 2009 13:58:40 GMT
Has anyone looked/used Antlr for Query Parser capabilities?  There was  
some discussion over at Apache Labs that might bear discussing in  
light of our new Query Parser contrib.

Begin forwarded message:

> From: Tim Williams <williamstw@gmail.com>
> Date: August 17, 2009 8:09:04 PM EDT
> To: labs@labs.apache.org
> Subject: Re: Lab - Esqueranto
> Reply-To: labs@labs.apache.org
>
> On Mon, Aug 17, 2009 at 7:00 PM, Grant  
> Ingersoll<gsingers@apache.org> wrote:
>>
>> On Aug 2, 2009, at 1:43 PM, Tim Williams wrote:
>>>
>>> Hi Martin,
>>> Sure, if it works like I envision it, Lucene would just be *one*
>>> concrete tree grammar implementation - there could be others (ie
>>> OracleText), I'm thinking it is broader than one implementation -
>>> otherwise, I reckon it's Yet Another Lucene Query Parser (YALQP).
>>>
>>> For more practical reasons, I'm not a Lucene committer and it'd be
>>> slow going to play around with this through JIRA patches to their
>>> sandbox.
>>
>> FWIW, Lucene has recently added a new, more flexible Query Parser  
>> that
>> allows for separation of the various pieces (syntax, intermediate
>> representation, Lucene Query).  You might want to check it out and  
>> see how
>> that fits
>
> Thanks Grant, yeah I've looked at that and it seems really (overly?)
> complex for what I'm trying to achieve.  It seems to re-implement much
> of the goodness that antlr provides for free.  For example, with antlr
> I already get a lexer/parser grammar separate from the tree grammar.
> So, to plug in a new parser syntax is trivial - just implement a new
> lexer/parser grammar that provides tree rewrites consistent with a
> lucene tree grammar.  Conversely, to implement a new concrete
> implementation, just implement a new tree grammar for the existing
> lexer/parser grammar.
>
> Of course, maybe I'll get down this road and realize how naive my path
> is and just switch over.  For now, just looking at a query parser
> that, by itself, is approaching the size of the lucene core code base
> is intimidating:)  Thanks for the pointer though, I'm subscribed over
> there and keep an eye out for progress on the new parser....
>
> Thanks,
> --tim
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: labs-unsubscribe@labs.apache.org
> For additional commands, e-mail: labs-help@labs.apache.org
>



Mime
View raw message