C4/ClassSortRoutine/Dewey.pm

   1 package 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.
  19
  20 use strict;
  21 use warnings;
  22
  23 use vars qw($VERSION);
  24
  25 # set the version for version checking
  26 $VERSION = 3.07.00.049;
  27
  28 =head1 NAME
  29
  30 C4::ClassSortRoutine::Dewey - generic call number sorting key routine
  31
  32 =head1 SYNOPSIS
  33
  34 use C4::ClassSortRoutine;
  35
  36 my $cn_sort = GetClassSortKey('Dewey', $cn_class, $cn_item);
  37
  38 =head1 FUNCTIONS
  39
  40 =head2 get_class_sort_key
  41
  42   my $cn_sort = C4::ClassSortRoutine::Dewey::Dewey($cn_class, $cn_item);
  43
  44 Generates sorting key using the following rules:
  45
  46 * Concatenates class and item part.
  47 * Converts to uppercase.
  48 * Removes leading and trailing whitespace and '/'
  49 * Separates alphabetic prefix from the rest of the call number
  50 * Splits into tokens on whitespaces and periods.
  51 * Leaves first digit group as is.
  52 * Converts second digit group to 15-digit long group, padded on right with zeroes.
  53 * Converts each run of whitespace to an underscore.
  54 * Removes any remaining non-alphabetical, non-numeric, non-underscore characters.
  55
  56 =cut
  57
  58 sub get_class_sort_key {
  59     my ($cn_class, $cn_item) = @_;
  60
  61     $cn_class = '' unless defined $cn_class;
  62     $cn_item  = '' unless defined $cn_item;
  63     my $init = uc "$cn_class $cn_item";
  64     $init =~ s/^\s+//;
  65     $init =~ s/\s+$//;
  66     $init =~ s!/!!g;
  67     $init =~ s/^([\p{IsAlpha}]+)/$1 /;
  68     my @tokens = split /\.|\s+/, $init;
  69     my $digit_group_count = 0;
  70     my $first_digit_group_idx;
  71     for (my $i = 0; $i <= $#tokens; $i++) {
  72         if ($tokens[$i] =~ /^\d+$/) {
  73             $digit_group_count++;
  74             if (1 == $digit_group_count) {
  75                 $first_digit_group_idx = $i;
  76             }
  77             if (2 == $digit_group_count) {
  78                 $tokens[$i] = sprintf("%-15.15s", $tokens[$i]);
  79                 $tokens[$i] =~ tr/ /0/;
  80             }
  81         }
  82     }
  83     # Pad the first digit_group if there was only one
  84     if (1 == $digit_group_count) {
  85         $tokens[$first_digit_group_idx] .= '_000000000000000'
  86     }
  87     my $key = join("_", @tokens);
  88     $key =~ s/[^\p{IsAlnum}_]//g;
  89
  90     return $key;
  91
  92 }
  93
  94 1;
  95
  96 =head1 AUTHOR
  97
  98 Koha Development Team <http://koha-community.org/>
  99
 100 =cut
 101