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 | # moved here from BasClas so import can share it
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32 | sub format_metadata_for_sorting {
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33 | my ($metaname, $metavalue, $doc_obj) = @_;
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34 | if (!defined $metaname || $metaname !~ /\S/ || ! defined $metavalue || $metavalue !~ /\S/) {
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35 | return "";
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36 | }
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37 |
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38 | if ($metaname eq "Language") {
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39 | $metavalue = $iso639::fromiso639{$metavalue};
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40 | return $metavalue;
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41 | }
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42 |
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43 | my $lang;
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44 | if (defined $doc_obj) {
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45 | $lang = $doc_obj->get_metadata_element ($doc_obj->get_top_section(), 'Language');
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46 | }
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47 | $lang = 'en' unless defined $lang;
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48 |
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49 | # is this metadata likely to be a name?
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50 | my $function_name="format_string_name_$lang";
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51 | if ($metaname =~ /^(?:\w+\.)?(?:Creators?|Authors?|Editors?)(?:[:,].*)?$/
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52 | && exists &$function_name) {
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53 | no strict 'refs';
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54 | &$function_name(\$metavalue);
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55 | } else {
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56 | $function_name="format_string_$lang";
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57 | if (exists &$function_name) {
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58 | no strict 'refs';
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59 | &$function_name(\$metavalue);
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60 | }
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61 | }
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62 |
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63 | return $metavalue;
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64 | }
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65 |
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66 | ### language-specific sorting functions (called by format_metadata_for_sorting)
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67 |
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68 | ## format_string_$lang() converts to lowercase (where appropriate), and
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69 | # removes punctuation, articles from the start of string, etc
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70 | ## format_string_name_$lang() converts to lowercase, puts the surname first,
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71 | # removes punctuation, etc
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72 |
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73 | sub format_string_en {
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74 | my $stringref = shift;
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75 | $$stringref = lc($$stringref);
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76 | $$stringref =~ s/&[^\;]+\;//g; # html entities
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77 | $$stringref =~ s/^\s*(the|a|an)\b//; # articles
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78 | $$stringref =~ s/[^[:alnum:]]//g;
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79 | $$stringref =~ s/\s+/ /g;
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80 | $$stringref =~ s/^\s+//;
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81 | $$stringref =~ s/\s+$//;
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82 | }
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83 |
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84 | sub format_string_name_en {
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85 | my ($stringref) = @_;
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86 | $$stringref =~ tr/A-Z/a-z/;
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87 | $$stringref =~ s/&\S+;//g;
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88 |
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89 | my $comma_format = ($$stringref =~ m/^.+,.+$/);
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90 | $$stringref =~ s/[[:punct:]]//g;
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91 | $$stringref =~ s/\s+/ /g;
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92 | $$stringref =~ s/^\s+//;
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93 | $$stringref =~ s/\s+$//;
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94 |
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95 |
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96 | if (!$comma_format) {
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97 | # No commas in name => name in 'firstname surname' format
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98 | # need to sort by surname
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99 | my @names = split / /, $$stringref;
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100 | my $surname = pop @names;
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101 | while (scalar @names && $surname =~ /^(jnr|snr)$/i) {
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102 | $surname = pop @names;
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103 | }
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104 | $$stringref = $surname . " " . $$stringref;
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105 | }
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106 | }
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107 |
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108 |
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109 | sub format_string_fr {
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110 | my $stringref = shift;
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111 |
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112 | $$stringref = lc($$stringref);
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113 | $$stringref =~ s/&[^\;]+\;//g; # html entities
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114 | $$stringref =~ s/[^[:alpha:]]//g;
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115 | $$stringref =~ s/^\s*(les?|la|une?)\b//; # articles
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116 | $$stringref =~ s/\s+/ /g;
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117 | $$stringref =~ s/^\s+//;
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118 | $$stringref =~ s/\s+$//;
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119 | }
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120 |
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121 | sub format_string_es {
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122 | my $stringref = shift;
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123 |
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124 | $$stringref = lc($$stringref);
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125 | $$stringref =~ s/&[^\;]+\;//g; # html entities
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126 | $$stringref =~ s/[^[:alpha:]]//g;
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127 | $$stringref =~ s/^\s*(la|el)\b//; # articles
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128 | $$stringref =~ s/\s+/ /g;
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129 | $$stringref =~ s/^\s+//;
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130 | $$stringref =~ s/\s+$//;
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131 | }
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132 |
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133 | ### end of language-specific functions
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134 |
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135 | # takes arguments of day, month, year and converts to
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136 | # date of form yyyymmdd. month may be full (e.g. "January"),
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137 | # abbreviated (e.g. "Jan"), or a number (1-12). Years like "86"
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138 | # will be assumed to be "1986".
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139 | sub format_date {
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140 | my ($day, $month, $year) = @_;
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141 |
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142 | my %months = ('january' => '01', 'jan' => '01', 'february' => '02', 'feb' => '02',
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143 | 'march' => '03', 'mar' => '03', 'april' => '04', 'apr' => '04',
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144 | 'may' => '05', 'june' => '06', 'jun' => '06', 'july' => '07',
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145 | 'jul' => '07', 'august' => '08', 'aug' => '08', 'september' => '09',
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146 | 'sep' => '09', 'october' => '10', 'oct' => '10', 'november' => '11',
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147 | 'nov' => '11', 'december' => '12', 'dec' => '12');
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148 |
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149 | $month =~ tr/A-Z/a-z/;
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150 |
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151 | if ($day < 1) {
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152 | print STDERR "sorttools::format_date WARNING day $day out of range\n";
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153 | $day = "01";
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154 | } elsif ($day > 31) {
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155 | print STDERR "sorttools::format_date WARNING day $day out of range\n";
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156 | $day = "31";
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157 | }
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158 |
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159 | $day = "0$day" if (length($day) == 1);
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160 |
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161 | if ($month =~ /^\d\d?$/) {
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162 | if ($month < 1) {
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163 | print STDERR "sorttools::format_date WARNING month $month out of range\n";
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164 | $month = "01";
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165 | } elsif ($month > 12) {
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166 | print STDERR "sorttools::format_date WARNING month $month out of range\n";
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167 | $month = "12";
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168 | }
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169 | if ($month =~ /^\d$/) {
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170 | $month = "0" . $month;
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171 | }
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172 | } elsif (!defined $months{$month}) {
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173 | print STDERR "sorttools::format_date WARNING month $month out of range\n";
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174 | $month = "01";
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175 | } else {
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176 | $month = $months{$month};
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177 | }
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178 |
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179 | if ($year !~ /^\d\d\d\d$/) {
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180 | if ($year !~ /^\d\d$/) {
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181 | my $newyear = 1900 + $year;
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182 | print STDERR "sorttools::format_date WARNING year $year assumed to be $newyear\n";
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183 | $year=$newyear;
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184 | } else {
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185 | print STDERR "sorttools::format_date WARNING year $year out of range - reset to 1900\n";
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186 | $year = "1900";
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187 | }
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188 | }
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189 |
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190 | return "$year$month$day";
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191 | }
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192 |
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193 |
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194 | 1;
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