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.IX Title "Text::Query::ParseAdvanced 3"
.TH Text::Query::ParseAdvanced 3 "1999-06-19" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
Text::Query::ParseAdvanced \- Parse AltaVista advanced query syntax
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 5
\&  use Text::Query;
\&  my $q=new Text::Query('hello and world',
\&                        -parse => 'Text::Query::ParseAdvanced',
\&                        -solve => 'Text::Query::SolveAdvancedString',
\&                        -build => 'Text::Query::BuildAdvancedString');
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides an object that parses a string  
containing a Boolean query expression similar to an AltaVista \*(L"advanced 
query\*(R".
.PP
It's base class is Text::Query::Parse;
.PP
Query expressions consist of literal strings (or regexps) joined by the 
following operators, in order of precedence from lowest to highest:
.IP "\s-1OR\s0, |" 4
.IX Item "OR, |"
.PD 0
.IP "\s-1AND\s0, &" 4
.IX Item "AND, &"
.IP "\s-1NEAR\s0, ~" 4
.IX Item "NEAR, ~"
.IP "\s-1NOT\s0, !" 4
.IX Item "NOT, !"
.PD
.PP
Operator names are not case\-sensitive.  Note that if you want to use a \f(CW\*(C`|\*(C'\fR 
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 \*(L"and,\*(R" \*(L"or,\*(R" or \*(L"not\*(R" literally and may be grouped in parentheses 
(\f(CW\*(C`(, )\*(C'\fR) to alter the precedence of evaluation.
.PP
A parenthesized sub-expression may also be concatenated with other sub\- 
expressions to match sequences: \f(CW\*(C`(Perl or Python) interpreter\*(C'\fR would match 
either \*(L"Perl interpreter\*(R" or \*(L"Python interpreter\*(R".  Concatenation has a 
precedence higher than \s-1NOT\s0 but lower than \s-1AND\s0.  Juxtaposition of 
simple words has the highest precedence of all.
.SH "OPTIONS"
.IX Header "OPTIONS"
These are the additional options of the \f(CW\*(C`prepare\*(C'\fR method and the constructor.
.IP "\-near defaults to 10" 4
.IX Item "-near defaults to 10"
Sets the number of words that can occur between two expressions 
and still satisfy the \s-1NEAR\s0 operator.
.IP "\-operators defaults to and, or, not, near" 4
.IX Item "-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:
.Sp
.Vb 6
\&    {
\&        'or' => 'ou',
\&        'and' => 'et',
\&        'near' => 'proche',
\&        'not' => 'non',
\&    }
.Ve
.IP "\-scope_map default to {}" 4
.IX Item "-scope_map default to {}"
Map the scope names to other names. If a scope is specified as \f(CW\*(C`scope:\*(C'\fR
search the map for an entry whose key is \f(CW\*(C`scope\*(C'\fR and replace \f(CW\*(C`scope\*(C'\fR with
the scalar found. For instance:
.Sp
.Vb 3
\&     {
\&         'scope' => 'otherscope'
\&     }
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIText::Query\fR\|(3)
\&\fIText::Query::Parse\fR\|(3)
.SH "AUTHORS"
.IX Header "AUTHORS"
Eric Bohlman (ebohlman@netcom.com)
.PP
Loic Dachary (loic@senga.org)