/usr/share/perl5/Tangram/Type/Dump.pm is in libtangram-perl 2.10-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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=head1 NAME
Tangram::Type::Dump - Handy functions for Pixie-like dumping of data
=head1 SYNOPSIS
use Tangram::Type::Dump qw(flatten unflatten UNflatten nuke);
use YAML qw(freeze thaw); # for instance
my $frozen = freeze flatten($storage, $structure);
# optional - remove circular references from flattened
# structure so that it is freed up properly.
nuke $frozen;
# save frozen somewhere...
# restore, but don't load objects straight away
my $reconstituted = unflatten($storage, thaw $frozen);
# restore, loading objects immediately
my $original = UNflatten($storage, $frozen);
# Alternative, quickly marshall a structure for saving
my $structure;
flatten($storage, $structure);
# ... do something with it ...
# restore to former glory; note that Tangram's cache will
# prevent unnecessary DB access.
unflatten($storage, $structure);
=head1 DESCRIPTION
This module contains functions for traversing data structures which
are I<not> Tangram-registered objects, and replacing all the Tangram
objects found with `Mementos'.
When a similar data structure is fed back into the reversal function,
the mementos are filled with on-demand references to the real objects.
All these functions operate B<in place> for maximum efficiency.
=cut
use Exporter;
use vars qw(@ISA @EXPORT @EXPORT_OK);
use strict;
BEGIN {
@ISA=qw(Exporter);
@EXPORT_OK=qw(scan flatten unflatten expand nuke);
}
use Set::Object qw(blessed reftype refaddr);
#use Tangram::Info qw(dispel_overload);
use Carp;
use constant DEBUG => 0;
sub debug { print STDERR __PACKAGE__
."[line ".((caller())[2])."]: @_\n" if DEBUG }
=head1 FUNCTIONS
=over
=item B<flatten($storage, $structure)>
Traverses the structure B<$structure>, and replaces all the known (ie,
already inserted) Tangram objects with references to them
=cut
sub flatten {
my $storage = shift;
blessed $storage && $storage->isa("Tangram::Storage")
or croak 'usage: flatten($storage, $structure)';
my $structure = shift;
ref $structure or return $structure;
debug "flatten($structure)";
# check for Tangram objects, replace them with mementos
my @obj_stack = $structure;
my $seen = Set::Object->new(@obj_stack);
my $check = sub {
if (my $x = tied $_[0] ) {
if ( $x->isa("Tangram::Lazy::Ref") ) {
# FIXME - code path not covered by test suite
my ($id,$cid) = $storage->split_id($x->id);
$id.=",$cid";
#@$x = ();
#untie $_[0];
$_[0] = bless \$id, "Tangram::Memento";
} else {
# ignore; the user's problem :)
}
} else {
if ( ref $_[0] ) {
if (blessed $_[0] and
my $id = $storage->id_maybe_insert($_[0])) {
($id,my $cid) = $storage->split_id($id);
$id.=",$cid";
$_[0] = bless \$id, "Tangram::Memento";
} elsif ( blessed $_[0] && $_[0]->isa("Set::Object") ) {
# FIXME - use Pixie complicity functions to solve this for
# the general case.
my @objects = $_[0]->members;
$_[0]->DESTROY; # arrr!
${$_[0]} = \@objects;
# then re-bless it
bless $_[0], "Tangram::Memento::Set";
push @obj_stack, ${ $_[0] };
} elsif ($seen->insert($_[0])) {
push @obj_stack, $_[0]
}
}
}
};
while (my $obj = shift @obj_stack) {
if (reftype $obj eq "HASH") {
while (my $key = each %$obj) {
$check->($obj->{$key});
}
} elsif (reftype $obj eq "ARRAY") {
for my $i (0..$#$obj) {
$check->($obj->[$i]);
}
} elsif (reftype $obj eq "CODE") {
die "CODE references unsafe";
} elsif ( reftype $obj eq "SCALAR"
or reftype $obj eq "REF" ) {
# better hope it's not a ref to a C data structure :)
$check->($$obj);
}
}
use Data::Dumper;
(DEBUG > 1) && debug("flattened to: ".Dumper($structure));
}
=item B<unflatten($storage, $structure)>
Performs the logical opposite of B<flatten>, but only insofar as a
`normal' user is concerned. `Normal' users, of course, don't care
that the data structure is being loaded from the database as they use
it :).
=cut
use Data::Lazy 0.6;
sub unflatten {
my $storage = shift;
blessed $storage && $storage->isa("Tangram::Storage")
or croak 'usage: unflatten($storage, $structure)';
my $structure = shift;
ref $structure or return $structure;
debug "un-flatten $structure";
# look for mementos, replace them with on-demand references
my @obj_stack = $structure;
my $seen = Set::Object->new(@obj_stack);
my $check = sub {
if ( tied $_[0] and tied($_[0]) =~ m/^Tangram::Lazy::Ref/ ) {
# already a demand paged reference - ignore
} else {
if ( blessed $_[0] and $_[0]->isa("Tangram::Memento") ) {
my ($id, $cid) = ${$_[0]} =~ m{(\d+),(\d+)};
$id = $storage->combine_ids($id,$cid);
(DEBUG>1) && debug "setting up Lazy::Ref($id)";
if ( defined($storage->{objects}{$id}) ) {
$_[0] = $storage->{objects}{$id};
} else {
tie $_[0], 'Tangram::Lazy::Ref',
$storage, undef, \$_[0], $id;
}
} elsif ( blessed $_[0] and $_[0]->isa("Tangram::Memento::Set") ) {
my @members = @{${$_[0]}};
tie $_[0], "Data::Lazy",
sub {
my $x = Set::Object->new(@members);
@members=();
$x;
}, \$_[0];
push @obj_stack, \@members;
} elsif (ref $_[0] && $seen->insert($_[0])) {
push @obj_stack, $_[0];
}
}
};
while (my $obj = shift @obj_stack) {
if (reftype $obj eq "HASH") {
while (my $key = each %$obj) {
$check->($obj->{$key});
}
} elsif (reftype $obj eq "ARRAY") {
for my $i (0..$#$obj) {
$check->($obj->[$i]);
}
} elsif (reftype $obj eq "CODE") {
# ignore..
} elsif (reftype $obj eq "SCALAR" or
reftype $obj eq "REF") {
$check->($$obj) if ref $$obj;
}
}
return $structure;
}
1;
__END__
=back
=head1 BUGS
Should this module just be an extension to Tangram::Storage ?
=head1 AUTHOR
Sam Vilain, samv@cpan.org. All rights reserved. This code is free
software; you can use and/or modify it under the same terms as Perl
itself.
=cut
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