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#!/usr/local/bin/perl -w
# POD docs at end
use strict;
use Data::Stag qw(:all);
use Getopt::Long;
my @cols = ();
my $sep = "\t";
my $parser;
my $nest;
my $errhandler;
my $errf;
GetOptions(
"parser|format|p=s" => \$parser,
"errhandler=s" => \$errhandler,
"errf|e=s" => \$errf,
"cols|c=s@"=>\@cols,
"help|h"=>sub { system("perldoc $0"); exit },
"nest|n"=>\$nest,
);
$errhandler = Data::Stag->getformathandler($errhandler || 'xml');
if ($errf) {
$errhandler->file($errf);
}
else {
$errhandler->fh(\*STDERR);
}
my $node = shift;
my $fn = shift @ARGV;
push(@cols, @ARGV);
@cols = map {split/\,/,$_} @cols;
my $np = scalar @cols;
my %idx = map {$cols[$_]=>$_} (0..$#cols);
my @vals = map {[]} @cols;
my @level_idx = ();
sub setcol {
my ($col, $val) = @_;
my $i = $idx{$col};
die $col unless defined $i;
push(@{$vals[$i]}, $val);
return;
}
my %catch = ();
foreach my $col (@cols) {
$catch{$col} =
sub {
my ($self, $stag) = @_;
setcol($col, $stag->data);
return;
};
}
$catch{$node} =
sub {
my ($self, $stag) = @_;
push(@$_, 'NULL') foreach grep {!@$_} @vals; # "left join" - null for non-existent
if ($nest) {
print
join("\t", map {'{'.join(', ', @$_).'}'} @vals),
"\n";
}
else {
my $c = 1;
$c *= scalar(@$_) foreach @vals;
if ($c == 1) {
# no combinatorial explosion
print
join("\t", map {$_->[0]} @vals),
"\n";
}
elsif ($c == 0) {
print STDERR $stag->xml;
die "assertion error @vals";
}
else {
# do cartesian explosion
#
# we COULD do this recursively but it would be slow
my @N = map {0} @vals;
my $done = 0;
while (!$done) {
for (my $i=0; $i<@N; $i++) {
print "\t" if $i;
print $vals[$i]->[$N[$i]];
}
print "\n";
my $i = $#N;
my $carry_the_one = 1;
while ($i >= 0 && $carry_the_one) {
$N[$i] ++;
if ($N[$i] >= @{$vals[$i]}) {
$N[$i] = 0;
$i--;
}
else {
$carry_the_one = 0;
}
}
$done = 1 if $i<0;
}
}
}
@vals = map {[]} @cols;
return;
};
my $h = Data::Stag->makehandler(%catch);
Data::Stag->parse(-file=>$fn, -format=>$parser, -handler=>$h, -errhandler=>$errhandler);
exit 0;
__END__
=head1 NAME
stag-flatten - turns stag data into a flat table
=head1 SYNOPSIS
stag-flatten -c name -c person/name dept MyFile.xml
=head1 DESCRIPTION
reads in a file in a stag format, and 'flattens' it to a tab-delimited
table format. given this data:
(company
(dept
(name "special-operations")
(person
(name "james-bond"))
(person
(name "fred"))))
the above command will return a two column table
special-operations james-bond
special-operations fred
If there are multiple values for the columns within the node, then the
cartesian product will be calculated
=head1 USAGE
stag-flatten [-p PARSER] [-c COLS] [-c COLS] NODE <file>
=head1 ARGUMENTS
=over
=item -p|parser FORMAT
FORMAT is one of xml, sxpr or itext
xml assumed as default
=item -c|column COL1,COL2,COL3,..
the name of the columns/elements to write out
this can be specified either with multiple -c arguments, or with a
comma-seperated (no spaces) list of column (terminal node) names after
a single -c
=item -n|nest
if set, then the output will be a compress repeating values into the
same row; each cell in the table will be enclosed by {}, and will
contain a comma-delimited set of values
=back
=head1 SEE ALSO
L<Data::Stag>
=cut
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