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
   8 # under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # Koha is distributed in the hope that it will be useful, but
  13 # WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with Koha; if not, see <http://www.gnu.org/licenses>.
  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!/!!g;
  68     $init =~ s/^([\p{IsAlpha}]+)/$1 /;
  69     my @tokens = split /\.|\s+/, $init;
  70     my $digit_group_count = 0;
  71     my $first_digit_group_idx;
  72     for (my $i = 0; $i <= $#tokens; $i++) {
  73         if ($tokens[$i] =~ /^\d+$/) {
  74             $digit_group_count++;
  75             if (1 == $digit_group_count) {
  76                 $first_digit_group_idx = $i;
  77             }
  78             if (2 == $digit_group_count) {
  79                if ($i - $first_digit_group_idx == 1) {
  80                     $tokens[$i] = sprintf("%-15.15s", $tokens[$i]);
  81                     $tokens[$i] =~ tr/ /0/;
  82                 } else {
  83                     $tokens[$first_digit_group_idx] .= '_000000000000000'
  84                 }
  85             }
  86         }
  87     }
  88     # Pad the first digit_group if there was only one
  89     if (1 == $digit_group_count) {
  90         $tokens[$first_digit_group_idx] .= '_000000000000000'
  91     }
  92     my $key = join("_", @tokens);
  93     $key =~ s/[^\p{IsAlnum}_]//g;
  94
  95     return $key;
  96
  97 }
  98
  99 1;
 100
 101 =head1 AUTHOR
 102
 103 Koha Development Team <http://koha-community.org/>
 104
 105 =cut
 106