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1 | #-----------------------------------------------------------------------# |
2 | # NOTE! This module is deprecated (obsolete) after the Perl release # |
3 | # 5.003_06 as the functionality has been integrated into the Perl core. # |
4 | #-----------------------------------------------------------------------# |
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5 | |
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6 | package I18N::Collate; |
7 | |
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8 | =head1 NAME |
9 | |
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10 | I18N::Collate - compare 8-bit scalar data according to the current locale |
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11 | |
12 | =head1 SYNOPSIS |
13 | |
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14 | use I18N::Collate; |
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15 | setlocale(LC_COLLATE, 'locale-of-your-choice'); |
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16 | $s1 = new I18N::Collate "scalar_data_1"; |
17 | $s2 = new I18N::Collate "scalar_data_2"; |
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18 | |
19 | =head1 DESCRIPTION |
20 | |
21 | This module provides you with objects that will collate |
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22 | according to your national character set, provided that the |
23 | POSIX setlocale() function is supported on your system. |
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24 | |
25 | You can compare $s1 and $s2 above with |
26 | |
27 | $s1 le $s2 |
28 | |
29 | to extract the data itself, you'll need a dereference: $$s1 |
30 | |
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31 | This module uses POSIX::setlocale(). The basic collation conversion is |
32 | done by strxfrm() which terminates at NUL characters being a decent C |
33 | routine. collate_xfrm() handles embedded NUL characters gracefully. |
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34 | |
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35 | The available locales depend on your operating system; try whether |
36 | C<locale -a> shows them or man pages for "locale" or "nlsinfo" or the |
37 | direct approach C<ls /usr/lib/nls/loc> or C<ls /usr/lib/nls> or |
38 | C<ls /usr/lib/locale>. Not all the locales that your vendor supports |
39 | are necessarily installed: please consult your operating system's |
40 | documentation and possibly your local system administration. The |
41 | locale names are probably something like C<xx_XX.(ISO)?8859-N> or |
42 | C<xx_XX.(ISO)?8859N>, for example C<fr_CH.ISO8859-1> is the Swiss (CH) |
43 | variant of French (fr), ISO Latin (8859) 1 (-1) which is the Western |
44 | European character set. |
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45 | |
46 | =cut |
47 | |
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48 | # I18N::Collate.pm |
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49 | # |
50 | # Author: Jarkko Hietaniemi <Jarkko.Hietaniemi@hut.fi> |
51 | # Helsinki University of Technology, Finland |
52 | # |
53 | # Acks: Guy Decoux <decoux@moulon.inra.fr> understood |
54 | # overloading magic much deeper than I and told |
55 | # how to cut the size of this code by more than half. |
56 | # (my first version did overload all of lt gt eq le ge cmp) |
57 | # |
58 | # Purpose: compare 8-bit scalar data according to the current locale |
59 | # |
60 | # Requirements: Perl5 POSIX::setlocale() and POSIX::strxfrm() |
61 | # |
62 | # Exports: setlocale 1) |
63 | # collate_xfrm 2) |
64 | # |
65 | # Overloads: cmp # 3) |
66 | # |
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67 | # Usage: use I18N::Collate; |
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68 | # setlocale(LC_COLLATE, 'locale-of-your-choice'); # 4) |
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69 | # $s1 = new I18N::Collate "scalar_data_1"; |
70 | # $s2 = new I18N::Collate "scalar_data_2"; |
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71 | # |
72 | # now you can compare $s1 and $s2: $s1 le $s2 |
73 | # to extract the data itself, you need to deref: $$s1 |
74 | # |
75 | # Notes: |
76 | # 1) this uses POSIX::setlocale |
77 | # 2) the basic collation conversion is done by strxfrm() which |
78 | # terminates at NUL characters being a decent C routine. |
79 | # collate_xfrm handles embedded NUL characters gracefully. |
80 | # 3) due to cmp and overload magic, lt le eq ge gt work also |
81 | # 4) the available locales depend on your operating system; |
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82 | # try whether "locale -a" shows them or man pages for |
83 | # "locale" or "nlsinfo" work or the more direct |
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84 | # approach "ls /usr/lib/nls/loc" or "ls /usr/lib/nls". |
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85 | # Not all the locales that your vendor supports |
86 | # are necessarily installed: please consult your |
87 | # operating system's documentation. |
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88 | # The locale names are probably something like |
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89 | # 'xx_XX.(ISO)?8859-N' or 'xx_XX.(ISO)?8859N', |
90 | # for example 'fr_CH.ISO8859-1' is the Swiss (CH) |
91 | # variant of French (fr), ISO Latin (8859) 1 (-1) |
92 | # which is the Western European character set. |
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93 | # |
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94 | # Updated: 19961005 |
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95 | # |
96 | # --- |
97 | |
98 | use POSIX qw(strxfrm LC_COLLATE); |
99 | |
100 | require Exporter; |
101 | |
102 | @ISA = qw(Exporter); |
103 | @EXPORT = qw(collate_xfrm setlocale LC_COLLATE); |
104 | @EXPORT_OK = qw(); |
105 | |
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106 | use overload qw( |
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107 | fallback 1 |
108 | cmp collate_cmp |
109 | ); |
110 | |
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111 | sub new { |
112 | my $new = $_[1]; |
113 | |
114 | if ($^W && $] >= 5.003_06) { |
115 | unless ($please_use_I18N_Collate_even_if_deprecated) { |
116 | warn <<___EOD___; |
117 | *** |
118 | |
119 | WARNING: starting from the Perl version 5.003_06 the I18N::Collate |
120 | interface for comparing 8-bit scalar data according to the current locale |
121 | |
122 | HAS BEEN DEPRECATED |
123 | |
124 | (that is, please do not use it anymore for any new applications and please |
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125 | migrate the old applications away from it) because its functionality was |
126 | integrated into the Perl core language in the release 5.003_06. |
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127 | |
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128 | See pod/perllocale.pod for further information. |
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129 | |
130 | *** |
131 | ___EOD___ |
132 | $please_use_I18N_Collate_even_if_deprecated++; |
133 | } |
134 | } |
135 | |
136 | bless \$new; |
137 | } |
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138 | |
139 | sub setlocale { |
140 | my ($category, $locale) = @_[0,1]; |
141 | |
142 | POSIX::setlocale($category, $locale) if (defined $category); |
143 | # the current $LOCALE |
144 | $LOCALE = $locale || $ENV{'LC_COLLATE'} || $ENV{'LC_ALL'} || ''; |
145 | } |
146 | |
147 | sub C { |
148 | my $s = ${$_[0]}; |
149 | |
150 | $C->{$LOCALE}->{$s} = collate_xfrm($s) |
151 | unless (defined $C->{$LOCALE}->{$s}); # cache when met |
152 | |
153 | $C->{$LOCALE}->{$s}; |
154 | } |
155 | |
156 | sub collate_xfrm { |
157 | my $s = $_[0]; |
158 | my $x = ''; |
159 | |
160 | for (split(/(\000+)/, $s)) { |
161 | $x .= (/^\000/) ? $_ : strxfrm("$_\000"); |
162 | } |
163 | |
164 | $x; |
165 | } |
166 | |
167 | sub collate_cmp { |
168 | &C($_[0]) cmp &C($_[1]); |
169 | } |
170 | |
171 | # init $LOCALE |
172 | |
173 | &I18N::Collate::setlocale(); |
174 | |
175 | 1; # keep require happy |