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#
# Copyright (C) 1999 Eric Bohlman, Loic Dachary
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
#
#
# $Header: /cvsroot/TextQuery/Text-Query-SQL/lib/Text/Query/BuildSQLFulcrum.pm,v 1.2 1999/07/01 11:32:11 loic Exp $
#
package Text::Query::BuildSQLFulcrum;
use strict;
use vars qw(@ISA $VERSION);
use Text::Query::BuildSQL;
use Carp;
@ISA = qw(Text::Query::BuildSQL);
sub resolve {
my($self, $scope, $t) = @_;
#
# If the scope is not the scope of the enclosing
# expression, the field must be explicitly specified.
#
my($fill_fields) = ( @{$scope} > 0 ) ? $$t[1] ne $scope->[0] : 1;
if(!ref($$t[2]) || $$t[0] eq 'true') {
return $self->resolve_literal($t, $fill_fields);
} else {
my(@operands);
unshift(@{$scope}, $$t[1]);
foreach (@{$t}[2..$#{$t}]) {
push(@operands, $self->resolve($scope, $_));
}
shift(@{$scope});
my(%opmap) = (
'and' => '&',
'or' => '|'
);
my($expr);
#
# If there is an homogenous scope, use compact form
#
if($$t[1]) {
if($opmap{$$t[0]}) {
$expr = " ( " . join(" $opmap{$$t[0]} ", @operands) . " ) ";
} elsif($$t[0] eq 'not') {
$expr = " ~ ( @operands ) ";
} elsif($$t[0] eq 'near') {
my($max) = $self->{parseopts}{-near};
$expr = " proximity $max characters ( " . join(" & ", @operands ) . " ) ";
}
#
# If this expression is not enclosed in an homogenous form
# resolve to explicit syntax
#
if($fill_fields) {
return $self->fill_fields(" __FIELD__ contains $expr ", $$t[1]);
} else {
#
# Otherwise just return the compact form
#
return $expr;
}
} else {
#
# We are not in homogenous scope, use explicit form
#
if($$t[0] eq 'or' or $$t[0] eq 'and') {
return " ( " . join(" $$t[0] ", @operands) . " ) ";
} elsif($$t[0] eq 'not') {
return " not ( @operands ) ";
}
}
}
}
sub has_relevance {
shift->SUPER::has_relevance();
return 1;
}
sub resolve_literal {
my($self, $t, $fill_fields) = @_;
my($true_value) = $$t[0] eq 'true';
my($weight) = '';
if($self->relevance_needed()) {
#
# At present relevance ranking is only needed for simple requests
#
if($true_value) {
#
# The 'true' value term has default weight (1)
#
$t = $$t[2];
} else {
#
# All search terms have a 10 weight
#
$weight = ' weight 10';
}
}
my($value) = " '" . $self->quote($$t[2]) . "'$weight ";
if($fill_fields) {
return $self->fill_fields(" __FIELD__ contains $value", $$t[1]);
} else {
#
# If the enclosing expression has the same scope, the distribution
# is delayed.
#
return $value;
}
}
1;
__END__
=head1 NAME
Text::Query::BuildSQLFulcrum - Builder for Fulcrum SearchServer
=head1 SYNOPSIS
use Text::Query;
my $q=new Text::Query('hello and world',
-parse => 'Text::Query::ParseAdvanced',
-solve => 'Text::Query::SolveSQL',
-build => 'Text::Query::BuildSQLFulcrum');
=head1 DESCRIPTION
Generates a well formed C<where> clause for Text::Query::ParseAdvanced or
Text::Query::ParseSimple suitable for query with Fulcrum SearchServer.
=head1 SEE ALSO
Text::Query(3)
Text::Query::BuildSQL(3)
=head1 AUTHORS
Loic Dachary (loic@senga.org)
=cut
# Local Variables: ***
# mode: perl ***
# End: ***
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