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#!/usr/local/bin/perl -w
# POD docs at end
use strict;
use Data::Stag qw(:all);
use Getopt::Long;
use strict;
use Carp;
use Data::Stag qw(:all);
use Getopt::Long;
my $parser = "";
my $handler = "";
my $mapf;
my $tosql;
my $toxml;
my $toperl;
my $debug;
my $help;
my @add = ();
my $lc;
my $merge;
GetOptions(
"help|h"=>\$help,
"parser|format|p=s" => \$parser,
"handler|writer|w=s" => \$handler,
"xml"=>\$toxml,
"perl"=>\$toperl,
"lc"=>\$lc,
"debug"=>\$debug,
"merge=s"=>\$merge,
);
if ($help) {
system("perldoc $0");
exit 0;
}
my $funcname = shift @ARGV;
my $match = shift @ARGV;
my @files = @ARGV;
my $func;
my $agg;
if ($funcname =~ /^sub /) {
$func = eval $funcname;
if ($@) {
die $@;
}
}
elsif ($funcname eq 'sum') {
$func =
sub {
$agg += $_ foreach @_;
};
}
elsif ($funcname eq 'avg') {
$func =
sub {
$agg += $_ foreach @_;
$agg = $agg/@_;
};
}
elsif ($funcname eq 'cat') {
$func =
sub {
$agg .= $_ foreach @_;
};
}
else {
die $funcname;
}
my @matches = ();
my $H = Data::Stag->makehandler($match => sub {
my $self = shift;
my $stag = shift;
my $data = $stag->data;
push(@matches, $data);
});
foreach my $fn (@files) {
Data::Stag->parse(-file=>$fn, -handler=>$H);
$func->(@matches);
print "$agg\n";
}
exit 0;
__END__
=head1 NAME
stag-query - aggregare queries
=head1 SYNOPSIS
stag-query avg person/age file.xml
stag-query sum person/salary file.xml
stag-query 'sub { $agg .= ", ".shift }' person/name file.xml
=head1 DESCRIPTION
Performs aggregate queries
=head1 ARGUMENTS
=cut
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