-
package MARC::Fast;
+
use strict;
use Carp;
-use Data::Dumper;
+use Data::Dump qw/dump/;
BEGIN {
use Exporter ();
use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
- $VERSION = 0.01;
+ $VERSION = 0.10;
@ISA = qw (Exporter);
#Give a hoot don't pollute, do not export more than needed by default
@EXPORT = qw ();
use MARC::Fast;
+ my $marc = new MARC::Fast(
+ marcdb => 'unimarc.iso',
+ );
+
+ foreach my $mfn ( 1 .. $marc->count ) {
+ print $marc->to_ascii( $mfn );
+ }
+
+For longer example with command line options look at L<scripts/dump_fastmarc.pl>
=head1 DESCRIPTION
This is very fast alternative to C<MARC> and C<MARC::Record> modules.
-It's is also very sutable for random access to MARC records (as opposed to
+It's is also very subtable for random access to MARC records (as opposed to
sequential one).
=head1 METHODS
quiet => 0,
debug => 0,
assert => 0,
+ hash_filter => sub {
+ my ($t, $record_number) = @_;
+ $t =~ s/foo/bar/;
+ return $t;
+ },
);
=cut
print STDERR "# opening ",$self->{marcdb},"\n" if ($self->{debug});
open($self->{fh}, $self->{marcdb}) || croak "can't open ",$self->{marcdb},": $!";
+ binmode($self->{fh});
$self->{count} = 0;
push @{$self->{fh_offset}}, tell($self->{fh});
my $leader;
- read($self->{fh}, $leader, 24);
+ my $len = read($self->{fh}, $leader, 24);
+
+ if ($len < 24) {
+ warn "short read of leader, aborting\n";
+ $self->{count}--;
+ last;
+ }
# Byte Name
# ---- ----
print STDERR "REC ",$self->{count},": $leader\n" if ($self->{debug});
# store leader for later
- push @{$self->{leaders}}, $leader;
+ push @{$self->{leader}}, $leader;
# skip to next record
- seek($self->{fh},substr($leader,0,5)-24,1);
+ my $o = substr($leader,0,5);
+ warn "# in record ", $self->{count}," record length isn't number but: ",dump($o),"\n" unless $o =~ m/^\d+$/;
+ if ($o > 24) {
+ seek($self->{fh},$o-24,1) if ($o);
+ } else {
+ last;
+ }
}
my $hash = $marc->fetch(42);
+First record number is C<1>
+
=cut
sub fetch {
my $self = shift;
- my $rec_nr = shift || return;
+ my $rec_nr = shift;
+
+ if ( ! $rec_nr ) {
+ $self->{last_leader} = undef;
+ return;
+ }
- my $leader = $self->{leaders}->[$rec_nr - 1];
+ my $leader = $self->{leader}->[$rec_nr - 1];
+ $self->{last_leader} = $leader;
unless ($leader) {
carp "can't find record $rec_nr";
return;
my $f = substr($fields,$addr,$len);
print STDERR "tag/len/addr $tag [$len] $addr: '$f'\n" if ($self->{debug});
- $row->{$tag} = $f;
+ push @{ $row->{$tag} }, $f;
my $del = substr($fields,$addr+$len-1,1);
return $row;
}
+
+=head2 last_leader
+
+Returns leader of last record L<fetch>ed
+
+ print $marc->last_leader;
+
+Added in version 0.08 of this module, so if you need it use:
+
+ use MARC::Fast 0.08;
+
+to be sure that it's supported.
+
+=cut
+
+sub last_leader {
+ my $self = shift;
+ return $self->{last_leader};
+}
+
+
+=head2 to_hash
+
+Read record with specified MFN and convert it to hash
+
+ my $hash = $marc->to_hash( $mfn, include_subfields => 1, );
+
+It has ability to convert characters (using C<hash_filter>) from MARC
+database before creating structures enabling character re-mapping or quick
+fix-up of data.
+
+This function returns hash which is like this:
+
+ '200' => [
+ {
+ 'i1' => '1',
+ 'i2' => ' '
+ 'a' => 'Goa',
+ 'f' => 'Valdo D\'Arienzo',
+ 'e' => 'tipografie e tipografi nel XVI secolo',
+ }
+ ],
+
+This method will also create additional field C<000> with MFN.
+
+=cut
+
+sub to_hash {
+ my $self = shift;
+
+ my $mfn = shift || confess "need mfn!";
+
+ my $args = {@_};
+
+ # init record to include MFN as field 000
+ my $rec = { '000' => [ $mfn ] };
+
+ my $row = $self->fetch($mfn) || return;
+
+ foreach my $tag (keys %{$row}) {
+ foreach my $l (@{$row->{$tag}}) {
+
+ # remove end marker
+ $l =~ s/\x1E$//;
+
+ # filter output
+ $l = $self->{'hash_filter'}->($l, $tag) if ($self->{'hash_filter'});
+
+ my $val;
+
+ # has identifiers?
+ ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\x1F/\x1F/);
+
+ my $sf_usage;
+ my @subfields;
+
+ # has subfields?
+ if ($l =~ m/\x1F/) {
+ foreach my $t (split(/\x1F/,$l)) {
+ next if (! $t);
+ my $f = substr($t,0,1);
+
+ push @subfields, ( $f, $sf_usage->{$f}++ || 0 );
+
+ # repeatable subfiled -- convert it to array
+ if ($val->{$f}) {
+ if ( ref($val->{$f}) ne 'ARRAY' ) {
+ $val->{$f} = [ $val->{$f}, $val ];
+ } else {
+ push @{$val->{$f}}, $val;
+ }
+ }
+ $val->{substr($t,0,1)} = substr($t,1);
+ }
+ $val->{subfields} = [ @subfields ] if $args->{include_subfields};
+ } else {
+ $val = $l;
+ }
+
+ push @{$rec->{$tag}}, $val;
+ }
+ }
+
+ return $rec;
+}
+
+=head2 to_ascii
+
+ print $marc->to_ascii( 42 );
+
+=cut
+
+sub to_ascii {
+ my $self = shift;
+
+ my $mfn = shift || confess "need mfn";
+ my $row = $self->fetch($mfn) || return;
+
+ my $out;
+
+ foreach my $f (sort keys %{$row}) {
+ my $dump = join('', @{ $row->{$f} });
+ $dump =~ s/\x1e$//;
+ $dump =~ s/\x1f/\$/g;
+ $out .= "$f\t$dump\n";
+ }
+
+ return $out;
+}
+
1;
__END__
-=head1 BUGS
+=head1 UTF-8 ENCODING
+This module does nothing with encoding. But, since MARC format is byte
+oriented even when using UTF-8 which has variable number of bytes for each
+character, file is opened in binary mode.
+As a result, all scalars recturned to perl don't have utf-8 flag. Solution is
+to use C<hash_filter> and L<Encode> to decode utf-8 encoding like this:
-=head1 SUPPORT
+ use Encode;
+ my $marc = new MARC::Fast(
+ marcdb => 'utf8.marc',
+ hash_filter => sub {
+ Encode::decode( 'utf-8', $_[0] );
+ },
+ );
+This will affect C<to_hash>, but C<fetch> will still return binary representation
+since it doesn't support C<hash_filter>.
=head1 AUTHOR
=head1 SEE ALSO
-perl(1).
+L<Biblio::Isis>, perl(1).
=cut
projects / MARC-Fast / blobdiff