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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/BuildSQLMySQL.pm,v 1.3 1999/07/01 11:32:11 loic Exp $
#
package Text::Query::BuildSQLMySQL;
use strict;
use vars qw(@ISA $VERSION);
use Text::Query::BuildSQL;
use Carp;
@ISA = qw(Text::Query::BuildSQL);
sub build_near {
my($self, $l, $r) = @_;
if($$l[0] ne 'literal' || $$r[0] ne 'literal') {
croak("cannot use near on non literal");
} elsif($$l[1] ne $$r[1]) {
croak("cannot use near with literals that does not belong to the same scope");
} else {
my($t);
if(!$self->{parseopts}{-encoding} =~ /^big5$/io) {
$t = "$$l[2]%$$r[2]";
} else {
my($max) = $self->{parseopts}{-near};
my($op) = "([[:space:]]+[[:alnum:]]+){0,$max}[[:space:]]+";
$t = "$$l[2]$op$$r[2]";
}
return [ 'literal', $$l[1], $t ];
}
}
sub build_literal {
my($self, $t) = @_;
if(!$self->{parseopts}{-encoding} =~ /^big5$/io) {
$t = $self->quote($t);
} else {
$t = $self->string2word($t);
}
$t = [ 'literal', '', $t ];
return $t;
}
sub resolve {
my($self, $scope, $t) = @_;
my($fill_fields) = ( @{$scope} > 0 ) ? $$t[1] ne $scope->[0] : 1;
if(!ref($$t[2])) {
return $self->resolve_literal($t, $fill_fields);
} else {
my(@operands);
unshift(@{$scope}, $$t[1]);
foreach (@{$t}[2..$#{$t}]) {
push(@operands, $self->resolve($scope, $_));
}
shift(@{$scope});
my($expr);
if($$t[0] eq 'or' or $$t[0] eq 'and') {
$expr = " ( " . join(" $$t[0] ", @operands) . " ) ";
} elsif($$t[0] eq 'not') {
$expr = " not ( @operands ) ";
}
croak("undefined expr for $$t[0] $$t[1] @operands") if(!defined($expr));
# print "expr = (fill $fill_fields) $expr\n";
return $fill_fields ? $self->fill_fields($expr, $$t[1]) : $expr;
}
}
sub resolve_literal {
my($self, $t, $fill_fields) = @_;
my($value);
if(!$self->{parseopts}{-encoding} =~ /^big5$/io) {
$value = "__FIELD__ like '%" . $$t[2] . "%'";
} else {
$value = "__FIELD__ regexp '[[:<:]]" . $$t[2] . "[[:>:]]'";
}
return $fill_fields ? $self->fill_fields($value, $$t[1]) : $value;
}
#
# Translate a string to regexp according to case sensitivity
#
sub string2word {
my($self, $string) = @_;
if(!$self->{parseopts}{-case}) {
my($encoding) = $self->{parseopts}{-encoding};
if(!defined($encoding) ||
$encoding =~ /^(iso-latin|iso-8859)/io) {
$string = lc($string);
$string =~ s/([a-z])/\[$1\u$1\]/g;
}
}
return $string;
}
1;
__END__
=head1 NAME
Text::Query::BuildSQLMySQL - Builder for MySQL
=head1 SYNOPSIS
use Text::Query;
my $q=new Text::Query('hello and world',
-parse => 'Text::Query::ParseAdvanced',
-solve => 'Text::Query::SolveSQL',
-build => 'Text::Query::BuildSQLMySQL');
=head1 DESCRIPTION
Generates a well formed C<where> clause for Text::Query::ParseAdvanced or
Text::Query::ParseSimple suitable for query with MySQL.
=head1 OPTIONS
=over 4
=item -encoding STRING
The encoding of the strings in the MySQL database. If the encoding contains
C<BIG5> the strategy used to match is slightly different.
=back
=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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