-
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 = 0.04;
+ $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
my $len = read($self->{fh}, $leader, 24);
if ($len < 24) {
- carp "short read of leader, aborting\n";
+ warn "short read of leader, aborting\n";
+ $self->{count}--;
last;
}
print STDERR "REC ",$self->{count},": $leader\n" if ($self->{debug});
# store leader for later
- push @{$self->{leaders}}, $leader;
+ push @{$self->{leader}}, $leader;
# skip to next record
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 {
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;
}
+=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);
+ 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
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 $rec_nr (keys %{$row}) {
- foreach my $l (@{$row->{$rec_nr}}) {
+ foreach my $tag (keys %{$row}) {
+ foreach my $l (@{$row->{$tag}}) {
# remove end marker
$l =~ s/\x1E$//;
# filter output
- $l = $self->{'hash_filter'}->($l, $rec_nr) if ($self->{'hash_filter'});
+ $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);
- # repeatable subfileds. When we hit first one,
- # store CURRENT (up to that) in first repetition
- # of this record. Then, new record with same
- # identifiers will be created.
+
+ push @subfields, ( $f, $sf_usage->{$f}++ || 0 );
+
+ # repeatable subfiled -- convert it to array
if ($val->{$f}) {
- push @{$rec->{$rec_nr}}, $val;
- $val = {
- i1 => $val->{i1},
- i2 => $val->{i2},
- };
+ if ( ref($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->{$rec_nr}}, $val;
+ push @{$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