1 | ###########################################################################
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2 | #
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3 | # sorttools.pm --
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4 | # A component of the Greenstone digital library software
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5 | # from the New Zealand Digital Library Project at the
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6 | # University of Waikato, New Zealand.
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7 | #
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8 | # Copyright (C) 1999 New Zealand Digital Library Project
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9 | #
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10 | # This program is free software; you can redistribute it and/or modify
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11 | # it under the terms of the GNU General Public License as published by
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12 | # the Free Software Foundation; either version 2 of the License, or
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13 | # (at your option) any later version.
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14 | #
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15 | # This program is distributed in the hope that it will be useful,
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16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | # GNU General Public License for more details.
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19 | #
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20 | # You should have received a copy of the GNU General Public License
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21 | # along with this program; if not, write to the Free Software
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22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | #
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24 | ###########################################################################
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25 |
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26 | # various subroutines to format strings
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27 | # for sorting
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28 |
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29 | package sorttools;
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30 |
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31 |
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32 | # format an english string for sorting
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33 | # i.e. convert to lowercase, remove the, a or an
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34 | # from beginning of string etc.
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35 | sub format_string_english {
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36 | my ($stringref) = @_;
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37 |
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38 | $$stringref =~ tr/A-Z/a-z/;
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39 | $$stringref =~ s/[^a-z0-9 ]//g;
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40 | $$stringref =~ s/^\s*(the|a|an)\b//;
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41 | $$stringref =~ s/^\s+//;
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42 | }
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43 |
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44 | # format an english name for sorting
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45 | # i.e. convert to lowercase, put surname before
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46 | # first names etc.
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47 | sub format_string_name_english {
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48 | my ($stringref) = @_;
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49 |
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50 | $$stringref =~ tr/A-Z/a-z/;
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51 | $$stringref =~ s/[^a-z0-9 ]//g;
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52 | $$stringref =~ s/\s+/ /g;
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53 | $$stringref =~ s/^\s+//;
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54 | my @names = split / /, $$stringref;
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55 | my $surname = pop @names;
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56 | while (scalar @names && $surname =~ /^(jnr|snr)$/i) {
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57 | $surname = pop @names;
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58 | }
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59 | $$stringref = $surname . " " . $$stringref;
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60 | }
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61 |
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62 | # takes arguments of day, month, year and converts to
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63 | # date of form yyyymmdd. month may be full (e.g. "January"),
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64 | # abbreviated (e.g. "Jan"), or a number (1-12). Years like "86"
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65 | # will be assumed to be "1986".
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66 | sub format_date {
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67 | my ($day, $month, $year) = @_;
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68 |
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69 | my %months = ('january' => '01', 'jan' => '01', 'february' => '02', 'feb' => '02',
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70 | 'march' => '03', 'mar' => '03', 'april' => '04', 'apr' => '04',
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71 | 'may' => '05', 'june' => '06', 'jun' => '06', 'july' => '07',
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72 | 'jul' => '07', 'august' => '08', 'aug' => '08', 'september' => '09',
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73 | 'sep' => '09', 'october' => '10', 'oct' => '10', 'november' => '11',
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74 | 'nov' => '11', 'december' => '12', 'dec' => '12');
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75 |
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76 | $month =~ tr/A-Z/a-z/;
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77 |
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78 | if ($day < 1) {
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79 | print STDERR "sorttools::format_date WARNING day $day out of range\n";
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80 | $day = "01";
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81 | } elsif ($day > 31) {
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82 | print STDERR "sorttools::format_date WARNING day $day out of range\n";
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83 | $day = "31";
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84 | }
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85 |
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86 | $day = "0$day" if (length($day) == 1);
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87 |
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88 | if ($month =~ /^\d\d?$/) {
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89 | if ($month < 1) {
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90 | print STDERR "sorttools::format_date WARNING month $month out of range\n";
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91 | $month = "01";
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92 | } elsif ($month > 12) {
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93 | print STDERR "sorttools::format_date WARNING month $month out of range\n";
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94 | $month = "12";
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95 | }
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96 | if ($month =~ /^\d$/) {
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97 | $month = "0" . $month;
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98 | }
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99 | } elsif (!defined $months{$month}) {
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100 | print STDERR "sorttools::format_date WARNING month $month out of range\n";
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101 | $month = "01";
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102 | } else {
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103 | $month = $months{$month};
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104 | }
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105 |
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106 | if ($year !~ /^\d\d\d\d$/) {
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107 | if ($year !~ /^\d\d$/) {
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108 | print STDERR "sorttools::format_date WARNING year $year assumed to be 19$year\n";
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109 | $year = "19" . $year;
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110 | } else {
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111 | print STDERR "sorttools::format_date WARNING year $year out of range - reset to 1900\n";
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112 | $year = "1900";
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113 | }
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114 | }
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115 |
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116 | return "$year$month$day";
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117 | }
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118 |
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119 |
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120 | 1;
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