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File:C4/ClassSortRoutine/Dewey.pm
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1package C4::ClassSortRoutine::Dewey;
2
3# Copyright (C) 2007 LibLime
4#
5# This file is part of Koha.
6#
7# Koha is free software; you can redistribute it and/or modify it under the
8# terms of the GNU General Public License as published by the Free Software
9# Foundation; either version 2 of the License, or (at your option) any later
10# version.
11#
12# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
13# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
14# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
15#
16# You should have received a copy of the GNU General Public License along
17# with Koha; if not, write to the Free Software Foundation, Inc.,
18# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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use strict;
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use warnings;
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use vars qw($VERSION);
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25# set the version for version checking
26$VERSION = 3.00;
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=head1 NAME 

C4::ClassSortRoutine::Dewey - generic call number sorting key routine

=head1 SYNOPSIS

use C4::ClassSortRoutine;

my $cn_sort = GetClassSortKey('Dewey', $cn_class, $cn_item);

=head1 FUNCTIONS

=head2 get_class_sort_key

  my $cn_sort = C4::ClassSortRoutine::Dewey::Dewey($cn_class, $cn_item);

Generates sorting key using the following rules:

* Concatenates class and item part.
* Converts to uppercase.
* Removes leading and trailing whitespace and '/'
* Separates alphabetic prefix from the rest of the call number
* Splits into tokens on whitespaces and periods.
* Leaves first digit group as is.
* Converts second digit group to 15-digit long group, padded on right with zeroes.
* Converts each run of whitespace to an underscore.
* Removes any remaining non-alphabetical, non-numeric, non-underscore characters.

=cut
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58sub get_class_sort_key {
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    my ($cn_class, $cn_item) = @_;
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    $cn_class = '' unless defined $cn_class;
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    $cn_item = '' unless defined $cn_item;
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    my $init = uc "$cn_class $cn_item";
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    $init =~ s/^\s+//;
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    $init =~ s/\s+$//;
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    $init =~ s!/!!g;
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    $init =~ s/^([\p{IsAlpha}]+)/$1 /;
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    my @tokens = split /\.|\s+/, $init;
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    my $digit_group_count = 0;
70    for (my $i = 0; $i <= $#tokens; $i++) {
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        if ($tokens[$i] =~ /^\d+$/) {
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            $digit_group_count++;
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            if (2 == $digit_group_count) {
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                $tokens[$i] = sprintf("%-15.15s", $tokens[$i]);
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                $tokens[$i] =~ tr/ /0/;
76            }
77        }
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    }
79    # Pad the first digit_group if there was only one
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    if (1 == $digit_group_count) {
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        $tokens[0] .= '_000000000000000'
82    }
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    my $key = join("_", @tokens);
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    $key =~ s/[^\p{IsAlnum}_]//g;
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    return $key;
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88}
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=head1 AUTHOR

Koha Development Team <http://koha-community.org/>

=cut
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