man Text::Query::ParseAdvanced () - Parse AltaVista advanced query syntax
NAME
Text::Query::ParseAdvanced - Parse AltaVista advanced query syntax
SYNOPSIS
use Text::Query;
my $q=new Text::Query('hello and world',
-parse => 'Text::Query::ParseAdvanced',
-solve => 'Text::Query::SolveAdvancedString',
-build => 'Text::Query::BuildAdvancedString');
DESCRIPTION
This module provides an object that parses a string containing a Boolean query expression similar to an AltaVista advanced query.
It's base class is Text::Query::Parse;
Query expressions consist of literal strings (or regexps) joined by the following operators, in order of precedence from lowest to highest:
- OR, |
- AND, &
- NEAR, ~
- NOT, !
Operator names are not case-sensitive. Note that if you want to use a CW| in a regexp, you need to backwhack it to keep it from being seen as a query operator. Sub-expressions may be quoted in single or double quotes to match and, or, or not literally and may be grouped in parentheses (CW(, )) to alter the precedence of evaluation.
A parenthesized sub-expression may also be concatenated with other sub- expressions to match sequences: CW(Perl or Python) interpreter would match either Perl interpreter or Python interpreter. Concatenation has a precedence higher than NOT but lower than AND. Juxtaposition of simple words has the highest precedence of all.
OPTIONS
These are the additional options of the CWprepare method and the constructor.
- -near defaults to 10
- Sets the number of words that can occur between two expressions and still satisfy the NEAR operator.
- -operators defaults to and, or, not, near
-
Sets the operator names. The argument of the option is a pointer to a
hash table mapping the default names to desired names. For instance:
{ 'or' => 'ou', 'and' => 'et', 'near' => 'proche', 'not' => 'non', } - -scope_map default to {}
-
Map the scope names to other names. If a scope is specified as CWscope:
search the map for an entry whose key is CWscope and replace CWscope with
the scalar found. For instance:
{ 'scope' => 'otherscope' }
SEE ALSO
AUTHORS
Eric Bohlman (ebohlman@netcom.com)
Loic Dachary (loic@senga.org)