Author image Simon Cozens

NAME

Lucene::QueryParser - Turn a Lucene query into a Perl data structure

SYNOPSIS

  use Lucene::QueryParser;
  my $structure = parse_query("red and yellow and -(coat:pink and green)");

$structure will be:

 [ { query => 'TERM', type => 'NORMAL', term => 'red' },
   { query => 'TERM', type => 'NORMAL', term => 'yellow' },
   { subquery => [
        { query => 'TERM', type => 'NORMAL', term => 'pink', field => 'coat' },
        { query => 'TERM', type => 'NORMAL', term => 'green' }
     ], query => 'SUBQUERY', type => 'PROHIBITED' 
   }
 ]

DESCRIPTION

This module parses a Lucene query, as defined by http://lucene.sourceforge.net/cgi-bin/faq/faqmanager.cgi?file=chapter.search&toc=faq#q5

It deals with fields, types, phrases, subqueries, and so on; everything handled by the SimpleQuery class in Lucene. The data structure is similar to the one given above, and is pretty self-explanatory.

The other function, deparse_query turns such a data structure back into a Lucene query string. This is useful if you've just been mucking about with the data.

PLUCENE

Note for people using Plucene: the big arrayref and the hashes in the output of parse_query are actually objects. They're not Plucene::Query objects, because then everyone who wanted to do search queries would have to pull in Plucene, which is a bit unfair. However, they can be turned into Plucene::Querys by calling to_plucene on them. The argument to to_plucene should be the default field to search if none is supplied.

EXPORT

Exports the parse_query and deparse_query functions.

AUTHOR

Simon Cozens, <simon@kasei.com>

COPYRIGHT AND LICENSE

Copyright 2003 by Kasei

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.