BEGIN {
use Exporter ();
use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
- $VERSION = 0.20;
+ $VERSION = 0.22;
@ISA = qw (Exporter);
#Give a hoot don't pollute, do not export more than needed by default
@EXPORT = qw ();
read_fdt => 1,
include_deleted => 1,
hash_filter => sub {
- my $v = shift;
+ my ($v,$field_number) = @_;
$v =~ s#foo#bar#g;
},
debug => 1,
+ join_subfields_with => ' ; ',
);
Options are described below:
=item hash_filter
-Filter code ref which will be used before data is converted to hash.
+Filter code ref which will be used before data is converted to hash. It will
+receive two arguments, whole line from current field (in C<< $_[0] >>) and
+field number (in C<< $_[1] >>).
=item debug
Dump a B<lot> of debugging output even at level 1. For even more increase level.
+=item join_subfields_with
+
+Define delimiter which will be used to join repeatable subfields. This
+option is included to support lagacy application written against version
+older than 0.21 of this module. By default, it disabled. See L</to_hash>.
+
=back
=cut
'a' => [ 'foo', 'bar', 'baz' ],
}]
+Or in more complex example of
+
+ 902 ^aa1^aa2^aa3^bb1^aa4^bb2^cc1^aa5
+
+it will create
+
+ 902 => [
+ { a => ["a1", "a2", "a3", "a4", "a5"], b => ["b1", "b2"], c => "c1" },
+ ],
+
+This behaviour can be changed using C<join_subfields_with> option to L</new>,
+in which case C<to_hash> will always create single value for each subfield.
+This will change result to:
+
+
+
This method will also create additional field C<000> with MFN.
+There is also more elaborative way to call C<to_hash> like this:
+
+ my $hash = $isis->to_hash({
+ mfn => 42,
+ include_subfields => 1,
+ });
+
+Each option controll creation of hash:
+
+=over 4
+
+=item mfn
+
+Specify MFN number of record
+
+=item include_subfields
+
+This option will create additional key in hash called C<subfields> which will
+have original record subfield order and index to that subfield like this:
+
+ 902 => [ {
+ a => ["a1", "a2", "a3", "a4", "a5"],
+ b => ["b1", "b2"],
+ c => "c1",
+ subfields => ["a", 0, "a", 1, "a", 2, "b", 0, "a", 3, "b", 1, "c", 0, "a", 4],
+ } ],
+
+=item join_subfields_with
+
+Define delimiter which will be used to join repeatable subfields. You can
+specify option here instead in L</new> if you want to have per-record control.
+
+=back
+
=cut
sub to_hash {
my $self = shift;
+
my $mfn = shift || confess "need mfn!";
+ my $arg;
+
+ if (ref($mfn) eq 'HASH') {
+ $arg = $mfn;
+ $mfn = $arg->{mfn} || confess "need mfn in arguments";
+ }
# init record to include MFN as field 000
my $rec = { '000' => [ $mfn ] };
my $row = $self->fetch($mfn) || return;
- foreach my $k (keys %{$row}) {
- foreach my $l (@{$row->{$k}}) {
+ my $j_rs = $arg->{join_subfields_with};
+ $j_rs = $self->{join_subfields_with} unless(defined($j_rs));
+ my $i_sf = $arg->{include_subfields};
+
+ foreach my $f_nr (keys %{$row}) {
+ foreach my $l (@{$row->{$f_nr}}) {
# filter output
if ($self->{'hash_filter'}) {
- $l = $self->{'hash_filter'}->($l);
+ $l = $self->{'hash_filter'}->($l, $f_nr);
next unless defined($l);
}
my $val;
+ my $r_sf; # repeatable subfields in this record
# has identifiers?
($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\^/\^/);
foreach my $t (split(/\^/,$l)) {
next if (! $t);
my ($sf,$v) = (substr($t,0,1), substr($t,1));
- # FIXME make this option !
+ # XXX this might be option, but why?
next unless ($v);
-# warn "### $k^$sf:$v",$/ if ($self->{debug} > 1);
+# warn "### $f_nr^$sf:$v",$/ if ($self->{debug} > 1);
- # FIXME array return optional, by default unroll to ' ; '
if (ref( $val->{$sf} ) eq 'ARRAY') {
push @{ $val->{$sf} }, $v;
+
+ # record repeatable subfield it it's offset
+ push @{ $val->{subfields} }, ( $sf, $#{ $val->{$sf} } ) if (! $j_rs && $i_sf);
+ $r_sf->{$sf}++;
+
} elsif (defined( $val->{$sf} )) {
+
# convert scalar field to array
$val->{$sf} = [ $val->{$sf}, $v ];
+
+ push @{ $val->{subfields} }, ( $sf, 1 ) if (! $j_rs && $i_sf);
+ $r_sf->{$sf}++;
+
} else {
$val->{$sf} = $v;
+ push @{ $val->{subfields} }, ( $sf, 0 ) if ($i_sf);
}
}
} else {
$val = $l;
}
- push @{$rec->{$k}}, $val;
+ if ($j_rs) {
+ map {
+ $val->{$_} = join($j_rs, @{ $val->{$_} });
+ } keys %$r_sf
+ }
+
+ push @{$rec->{$f_nr}}, $val;
}
}
=head1 VERSIONS
-You can find version dependencies documented here
+As this is young module, new features are added in subsequent version. It's
+a good idea to specify version when using this module like this:
+
+ use Biblio::Isis 0.21
+
+Below is list of changes in specific version of module (so you can target
+older versions if you really have to):
=over 8
+=item 0.22
+
+Added field number when calling C<hash_filter>
+
+=item 0.21
+
+Added C<join_subfields_with> to L</new> and L</to_hash>.
+
+Added C<include_subfields> to L</to_hash>.
+
=item 0.20
-Added C<< $isis->mfn >> and support for repeatable subfields
+Added C<< $isis->mfn >>, support for repeatable subfields and
+C<< $isis->to_hash({ mfn => 42, ... }) >> calling convention
=back
=head1 SEE ALSO
+L<Biblio::Isis::Manual> for CDS/ISIS manual appendix F, G and H which describe file format
+
OpenIsis web site L<http://www.openisis.org>
perl4lib site L<http://perl4lib.perl.org>
projects / Biblio-Isis / blobdiff