NAME

       Search::Xapian::QueryParser - Parse a query string into a Search::Xapian::Query object

DESCRIPTION

       This module turns a human readable string into something Xapian can understand.  The
       syntax supported is designed to be similar to other web based search engines, so that
       users familiar with them don't have to learn a whole new syntax.

SYNOPSIS

         use Search::Xapian qw/:standard/;

         my $qp = new Search::Xapian::QueryParser( [$database] );
         $qp->set_stemmer(new Search::Xapian::Stem("english"));
         $qp->set_default_op(OP_AND);

         $database->enquire($qp->parse_query('a NEAR word OR "a phrase" NOT (too difficult) +eh'));

METHODS

       new <database>
           QueryParser constructor.

       set_stemmer <stemmer>
           Set the Search::Xapian::Stem object to be used for stemming query terms.

       set_stemming_strategy <strategy>
           Set the stemming strategy.  Valid values are "STEM_ALL", "STEM_SOME", "STEM_NONE".

       set_stopper <stopper>
           Set the Search::Xapian::Stopper object to be used for identifying stopwords.

       set_default_op <operator>
           Set the default operator.

           This operator is used to combine non-filter query items when no explicit operator is
           used.

           The most useful values for this are OP_OR (the default) and OP_AND.  OP_NEAR and
           OP_PHRASE can also be useful.

           See Search::Xapian for descriptions of these constants.

       get_default_op
           Returns the current default operator.

       set_database <database>
           Pass a Search::Xapian::Database object which is used to check whether terms exist in
           some situations.

       parse_query <query_string> [<flags>]
           Parses the query string according to the rules defined in the query parser
           documentation below. You can specify certain flags to modify the searching behaviour:

             FLAG_BOOLEAN, FLAG_PHRASE, FLAG_LOVEHATE, FLAG_BOOLEAN_ANY_CASE,
             FLAG_WILDCARD, FLAG_PURE_NOT, FLAG_PARTIAL, FLAG_SPELLING_CORRECTION,
             FLAG_SYNONYM, FLAG_AUTO_SYNONYMS, FLAG_AUTO_MULTIWORD_SYNONYMS

           To specify multiple flags, "bitwise or" them together (with "|").  The default flags
           are "FLAG_PHRASE|FLAG_BOOLEAN|FLAG_LOVEHATE"

       add_prefix <field> <prefix>
           Add a probabilistic term prefix.  E.g. $qp->add_prefix("author", "A");

           Allows the user to search for author:orwell which will search for the term "Aorwel"
           (assuming English stemming is in use). Multiple fields can be mapped to the same
           prefix (so you can e.g. make title: and subject: aliases for each other).

           Parameters: field     The user visible field name prefix    The term prefix to map
           this to

       add_boolean_prefix <field> prefix
           Add a boolean term prefix allowing the user to restrict a search with a boolean filter
           specified in the free text query.  E.g.

             $p->add_boolean_prefix("site", "H");

           Allows the user to restrict a search with site:xapian.org which will be converted to
           Hxapian.org combined with any probabilistic query with "OP_FILTER".

           Multiple fields can be mapped to the same prefix (so you can e.g. make site: and
           domain: aliases for each other).

           Parameters: field     The user visible field name prefix    The term prefix to map
           this to

       stoplist_begin
       stoplist_end
       unstem_begin
       unstem_end
       get_description
           Returns a string describing this object.

       get_corrected_query_string
           Get the spelling-corrected query string.

           This will only be set if FLAG_SPELLING_CORRECTION is specified when
           QueryParser::parse_query() was last called.

           If there were no corrections, an empty string is returned.

       set_max_wildcard_expansion <limit>
           Specify the maximum expansion of a wildcard term.

           Note: you must also set FLAG_WILDCARD for wildcard expansion to happen.

           Parameter limit is the maximum number of terms each wildcard in the query can expand
           to, or 0 for no limit (which is the default).

REFERENCE

         https://xapian.org/docs/queryparser.html
         https://xapian.org/docs/sourcedoc/html/classXapian_1_1QueryParser.html