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.\" ========================================================================
.\"
.IX Title "MARC::Fast 3pm"
.TH MARC::Fast 3pm "2023-01-29" "perl v5.36.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
MARC::Fast \- Very fast implementation of MARC database reader
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use MARC::Fast;
\&
\&  my $marc = new MARC::Fast(
\&        marcdb => \*(Aqunimarc.iso\*(Aq,
\&  );
\&
\&  foreach my $mfn ( 1 .. $marc\->count ) {
\&        print $marc\->to_ascii( $mfn );
\&  }
.Ve
.PP
For longer example with command line options look at \*(L"dump_fastmarc.pl\*(R" in scripts
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This is very fast alternative to \f(CW\*(C`MARC\*(C'\fR and \f(CW\*(C`MARC::Record\*(C'\fR modules.
.PP
It's is also very subtable for random access to \s-1MARC\s0 records (as opposed to
sequential one).
.SH "METHODS"
.IX Header "METHODS"
.SS "new"
.IX Subsection "new"
Read \s-1MARC\s0 database
.PP
.Vb 11
\&  my $marc = new MARC::Fast(
\&        marcdb => \*(Aqunimarc.iso\*(Aq,
\&        quiet => 0,
\&        debug => 0,
\&        assert => 0,
\&        hash_filter => sub {
\&                my ($t, $record_number) = @_;
\&                $t =~ s/foo/bar/;
\&                return $t;
\&        },
\&  );
.Ve
.SS "count"
.IX Subsection "count"
Return number of records in database
.PP
.Vb 1
\&  print $marc\->count;
.Ve
.SS "fetch"
.IX Subsection "fetch"
Fetch record from database
.PP
.Vb 1
\&  my $hash = $marc\->fetch(42);
.Ve
.PP
First record number is \f(CW1\fR
.SS "last_leader"
.IX Subsection "last_leader"
Returns leader of last record fetched
.PP
.Vb 1
\&  print $marc\->last_leader;
.Ve
.PP
Added in version 0.08 of this module, so if you need it use:
.PP
.Vb 1
\&  use MARC::Fast 0.08;
.Ve
.PP
to be sure that it's supported.
.SS "to_hash"
.IX Subsection "to_hash"
Read record with specified \s-1MFN\s0 and convert it to hash
.PP
.Vb 3
\&  my $hash = $marc\->to_hash( $mfn, include_subfields => 1,
\&        hash_filter => sub { my ($l,$tag) = @_; return $l; }
\&  );
.Ve
.PP
It has ability to convert characters (using \f(CW\*(C`hash_filter\*(C'\fR) from \s-1MARC\s0
database before creating structures enabling character re-mapping or quick
fix-up of data. If you specified \f(CW\*(C`hash_filter\*(C'\fR both in \f(CW\*(C`new\*(C'\fR and \f(CW\*(C`to_hash\*(C'\fR
only the one from \f(CW\*(C`to_hash\*(C'\fR will be used.
.PP
This function returns hash which is like this:
.PP
.Vb 9
\&  \*(Aq200\*(Aq => [
\&             {
\&               \*(Aqi1\*(Aq => \*(Aq1\*(Aq,
\&               \*(Aqi2\*(Aq => \*(Aq \*(Aq
\&               \*(Aqa\*(Aq => \*(AqGoa\*(Aq,
\&               \*(Aqf\*(Aq => \*(AqValdo D\e\*(AqArienzo\*(Aq,
\&               \*(Aqe\*(Aq => \*(Aqtipografie e tipografi nel XVI secolo\*(Aq,
\&             }
\&           ],
.Ve
.PP
This method will also create additional field \f(CW000\fR with \s-1MFN.\s0
.SS "to_ascii"
.IX Subsection "to_ascii"
.Vb 1
\&  print $marc\->to_ascii( 42 );
.Ve
.SH "UTF\-8 ENCODING"
.IX Header "UTF-8 ENCODING"
This module does nothing with encoding. But, since \s-1MARC\s0 format is byte
oriented even when using \s-1UTF\-8\s0 which has variable number of bytes for each
character, file is opened in binary mode.
.PP
As a result, all scalars recturned to perl don't have utf\-8 flag. Solution is
to use \f(CW\*(C`hash_filter\*(C'\fR and Encode to decode utf\-8 encoding like this:
.PP
.Vb 1
\&  use Encode;
\&
\&  my $marc = new MARC::Fast(
\&        marcdb => \*(Aqutf8.marc\*(Aq,
\&        hash_filter => sub {
\&                Encode::decode( \*(Aqutf\-8\*(Aq, $_[0] );
\&        },
\&  );
.Ve
.PP
This will affect \f(CW\*(C`to_hash\*(C'\fR, but \f(CW\*(C`fetch\*(C'\fR will still return binary representation
since it doesn't support \f(CW\*(C`hash_filter\*(C'\fR.
.SH "AUTHOR"
.IX Header "AUTHOR"
.Vb 4
\&        Dobrica Pavlinusic
\&        CPAN ID: DPAVLIN
\&        dpavlin@rot13.org
\&        http://www.rot13.org/~dpavlin/
.Ve
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
This program is free software; you can redistribute
it and/or modify it under the same terms as Perl itself.
.PP
The full text of the license can be found in the
\&\s-1LICENSE\s0 file included with this module.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Biblio::Isis, \fBperl\fR\|(1).