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package Koha::Filter::MARC::Punctuation; |
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# Copyright 2024 join2 |
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# |
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# This file is part of Koha. |
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# |
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# Koha is free software; you can redistribute it and/or modify it |
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# under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# Koha is distributed in the hope that it will be useful, but |
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# WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with Koha; if not, see <http://www.gnu.org/licenses>. |
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=head1 NAME |
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Koha::Filter::MARC::Punctuation - Automatically add punctuation to |
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Marc records if the leader specifies they were catalogued without it. |
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Documentation for proper punctuation: |
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https://www.loc.gov/aba/pcc/documents/isbdmarc2016.pdf |
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=head1 DESCRIPTION |
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If the Marc leader 18 specifies, that the record was catalogued |
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without punctuation add the proper punctuation chars to the individual |
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fields before passing the record on to fruther processing. Once this |
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filter is applied it should be safe for further steps to assume that |
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the record holds Marc punctuation. (The records in the database are |
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_not_ changed.) |
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Trigger to add punctuation: leader 18 is either `n` or `c`. |
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Currently handled fields: |
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- 245 |
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- 246 |
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- 247 |
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=cut |
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use strict; |
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use warnings; |
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use base qw(Koha::RecordProcessor::Base); |
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our $NAME = 'Punctuation'; |
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=head2 _decorate_245 |
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Add punctuation to MARC field 245 (title statement). The function |
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assumes that it is only called if no punctuation is part of the |
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record. |
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=cut |
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sub _decorate_245 { |
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my ($field) = @_; |
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# simple chars _preceeding_ a subfield |
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my %pchrs = ( |
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'b' => ' : ', |
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'c' => ' / ', |
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'd' => ' ; ', |
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'e' => '. ', |
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'f' => ', ', |
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'g' => ', ', |
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'k' => ' : ', |
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'n' => '. ', |
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'p' => ', ', |
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's' => '. ', |
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); |
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my @new_subfields = (); |
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foreach my $subfield ( $field->subfields ) { |
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my $sf = $subfield->[0]; |
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my $value = $subfield->[1]; |
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if ( exists $pchrs{$sf} ) { |
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$value = $pchrs{$sf} . $value; |
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} |
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# media type needs to be enclosed |
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if ( $sf eq 'h' ) { |
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$value = '[' . $value . ']'; |
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} |
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push( @new_subfields, $sf, $value ); |
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# TBD does titles always end with a `.`? |
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} |
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return @new_subfields; |
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} |
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=head2 _decorate_246_247 |
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Add punctuation to MARC field 246 (varying form title), 247 (former |
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title). The function assumes that it is only called if no punctuation |
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is part of the record. |
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=cut |
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sub _decorate_246_247 { |
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my ($field) = @_; |
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my %pchrs = ( |
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'b' => ' : ', |
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'f' => ', ', |
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'n' => '. ', |
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'q' => ', ', |
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'r' => ' = ', |
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't' => ' = ', |
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); |
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my @new_subfields = (); |
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foreach my $subfield ( $field->subfields ) { |
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my $sf = $subfield->[0]; |
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my $value = $subfield->[1]; |
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if ( exists $pchrs{$sf} ) { |
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$value = $pchrs{$sf} . $value; |
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} |
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if ( $sf eq 'i' ) { |
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# _append_ a char to i |
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$value .= ': '; |
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} |
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if ( $sf eq 'g' ) { |
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$value = '(' . $value . ')'; |
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} |
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# media type needs to be enclosed |
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if ( $sf eq 'h' ) { |
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$value = '[' . $value . ']'; |
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} |
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push( @new_subfields, $sf, $value ); |
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# TBD does titles always end with a `.`? |
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} |
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return @new_subfields; |
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} |
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=head2 filter |
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my $newrecord = $filter->filter($record); |
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Return title fields with proper punctuation either as the record held |
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them already or as they were added. |
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=cut |
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sub filter { |
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my ( $self, $record ) = @_; |
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return |
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unless $record and ref($record) eq 'MARC::Record'; |
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my $leader = $record->leader(); |
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my $punctuation_omitted = |
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( ( substr( $leader, 18, 1 ) eq 'c' ) or ( substr( $leader, 18, 1 ) eq 'n' ) ); |
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if ($punctuation_omitted) { |
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my @new_subfields = (); |
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foreach my $field ( $record->fields ) { |
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@new_subfields = (); |
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# decorate fields by individual functions: |
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if ( $field->tag() eq "245" ) { |
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@new_subfields = _decorate_245($field); |
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} |
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if ( ( $field->tag() eq "246" ) |
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or ( $field->tag() eq "247" ) ) |
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{ |
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@new_subfields = _decorate_246_247($field); |
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} |
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# If filtered, replace the field content |
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if (@new_subfields) { |
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$field->replace_with( |
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MARC::Field->new( |
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$field->tag(), |
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$field->indicator(1), |
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$field->indicator(2), |
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@new_subfields |
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) |
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); |
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} |
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} |
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} |
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return $record; |
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} |
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1; |