1: # The LearningOnline Network with CAPA
2: # Localization routines
3: #
4: # $Id: lonlocal.pm,v 1.37 2005/11/15 19:07:58 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ######################################################################
29: ######################################################################
30:
31: =pod
32:
33: =head1 NAME
34:
35: Apache::lonlocal - provides localization services
36:
37: =head1 SYNOPSIS
38:
39: lonlocal provides localization services for LON-CAPA programmers based
40: on Locale::Maketext. See
41: C<http://search.cpan.org/dist/Locale-Maketext/lib/Locale/Maketext.pod>
42: for more information on Maketext.
43:
44: =head1 OVERVIEWX<internationalization>
45:
46: As of LON-CAPA 1.1, we've started to localize LON-CAPA using the
47: Locale::Maketext module. Internationalization is the bulk of the work
48: right now (pre-1.1); localizing can be done anytime, and involves
49: little or no programming.
50:
51: The internationalization process involves putting a wrapper around
52: on-screen user messages and menus and turning them into keys,
53: which the MaketextX<Maketext> library translates into the desired
54: language output using a look-up table ("lexicon").X<lexicon>
55:
56: As keys we are currently using the plain English messages, and
57: Maketext is configured to replace the message by its own key if no
58: translation is found. This makes it easy to phase in the
59: internationalization without disturbing the screen output.
60:
61: Internationalization is somewhat tedious and effectively impossible
62: for a non-fluent speaker to perform, but is fairly easy to create
63: translations, requiring no programming skill. As a result, this is one
64: area where you can really help LON-CAPA out, even if you aren't a
65: programmer, and we'd really appreciate it.
66:
67: =head1 How To Localize Handlers For Programmers
68:
69: Into the "use" section of a module, we need to insert
70:
71: use Apache::lonlocal;
72:
73: Note that there are B<no parentheses>, we B<want> to pollute our
74: namespace.
75:
76: Inside might be something like this
77:
78: sub message {
79: my $status=shift;
80: my $message='Status unknown';
81: if ($status eq 'WON') {
82: $message='You have won.';
83: } elsif ($status eq 'LOST') {
84: $message='You are a total looser.';
85: }
86: return $message;
87: }
88: ...
89: $r->print('<h3>Gamble your Homework Points</h3>');
90: ...
91: $r->print(<<ENDMSG);
92: <font size="1">Rules:</font>
93: <font size="0">No purchase necessary. Illegal where not allowed.</font>
94: ENDMSG
95:
96: We have to now wrap the subroutine &mt()X<mt> ("maketext") around our
97: messages, but not around markup, etc. We also want minimal disturbance.
98: The first two examples are easy:
99:
100: sub message {
101: my $status=shift;
102: my $message='Status unknown';
103: if ($status eq 'WON') {
104: $message='You have won.';
105: } elsif ($status eq 'LOST') {
106: $message='You are a total looser.';
107: }
108: return &mt($message);
109: }
110: ...
111: $r->print('<h3>'.&mt('Gamble your Homework Points').'</h3>');
112:
113: The last one is a bummer, since you cannot call subroutines inside of
114: (<<MARKER). I have written a little subroutine to generate a translated
115: hash for that purpose:
116:
117: my %lt=&Apache::lonlocal::texthash('header' => 'Rules', 'disclaimer' =>
118: 'No purchase necessary. Illegal where not allowed.');
119: $r->print(<<ENDMSG);
120: <font size="1">$lt{'header'}:</font>
121: <font size="0">$lt{'disclaimer'}</font>
122: ENDMSG
123:
124: As a programmer, your job is done here. If everything worked, you
125: should see no changes on the screen.
126:
127: =head1 How To Localize LON-CAPA for Translators
128:
129: As a translator, you need to provide the lexicon for the keys, which in
130: this case is the plain text message. The lexicons sit in
131: loncom/localize/localize, with the language code as filename, for
132: example de.pm for the German translation. The file then simply looks
133: like this:
134:
135: 'You have won.'
136: => 'Sie haben gewonnen.',
137:
138: 'You are a total looser.'
139: => 'Sie sind der totale Verlierer.',
140:
141: 'Rules'
142: => 'Regeln',
143:
144: 'No purchase necessary. Illegal where not allowed.'
145: => 'Es ist erlaubt, einfach zu verlieren, und das ist Ihre Schuld.'
146:
147:
148: Comments may be added with the # symbol, which outside of a string
149: (the things with the apostrophe surrounding them, which are the
150: keys and translations) will cause the translation routines to
151: ignore the rest of the line.
152:
153: This is a relatively easy task, and any help is appreciated.
154:
155: Maketext can do a whole lot more, see
156: C<http://search.cpan.org/dist/Locale-Maketext/lib/Locale/Maketext.pod>
157: but for most purposes, we do not have to mess with that.
158:
159: =cut
160:
161: package Apache::lonlocal;
162:
163: use strict;
164: use Apache::Constants qw(:common);
165: use Apache::localize;
166: use locale;
167: use POSIX qw(locale_h);
168:
169: require Exporter;
170:
171: our @ISA = qw (Exporter);
172: our @EXPORT = qw(mt mtn ns);
173:
174: # ========================================================= The language handle
175:
176: use vars qw($lh);
177:
178: # ===================================================== The "MakeText" function
179:
180: sub mt (@) {
181: # open(LOG,'>>/home/www/loncapa/loncom/localize/localize/newphrases.txt');
182: # print LOG (@_[0]."\n");
183: # close(LOG);
184: if ($lh) {
185: return $lh->maketext(@_);
186: } else {
187: if (wantarray) {
188: return @_;
189: } else {
190: return $_[0];
191: }
192: }
193: }
194:
195: # ============================================================== What language?
196:
197: sub current_language {
198: if ($lh) {
199: my $lang=$lh->maketext('language_code');
200: return ($lang eq 'language_code'?'en':$lang);
201: }
202: return 'en';
203: }
204:
205: # ============================================================== What encoding?
206:
207: sub current_encoding {
208: my $default='UTF-8';
209: if ($Apache::lonnet::env{'browser.os'} eq 'win' &&
210: $Apache::lonnet::env{'browser.type'} eq 'explorer') {
211: $default='ISO-8859-1';
212: }
213: if ($lh) {
214: my $enc=$lh->maketext('char_encoding');
215: return ($enc eq 'char_encoding'?$default:$enc);
216: } else {
217: return $default;
218: }
219: }
220:
221: # =============================================================== Which locale?
222: # Refer to locale -a
223: #
224: sub current_locale {
225: if ($lh) {
226: my $enc=$lh->maketext('lang_locale');
227: return ($enc eq 'lang_locale'?'':$enc);
228: } else {
229: return undef;
230: }
231: }
232:
233: # ============================================================== Translate hash
234:
235: sub texthash {
236: my %hash=@_;
237: foreach (keys %hash) {
238: $hash{$_}=&mt($hash{$_});
239: }
240: return %hash;
241: }
242:
243: # ========= Get a handle (do not invoke in vain, leave this to access handlers)
244:
245: sub get_language_handle {
246: my $r=shift;
247: if ($r) {
248: my $headers=$r->headers_in;
249: $ENV{'HTTP_ACCEPT_LANGUAGE'}=$headers->{'Accept-language'};
250: }
251: my @languages=&Apache::loncommon::preferred_languages;
252: $ENV{'HTTP_ACCEPT_LANGUAGE'}='';
253: $lh=Apache::localize->get_handle(@languages);
254: if ($r) {
255: $r->content_languages([¤t_language()]);
256: }
257: ### setlocale(LC_ALL,¤t_locale);
258: }
259:
260: # ========================================================== Localize localtime
261: sub gettimezone {
262: return ' ('.$Apache::lonnet::env{'server.timezone'}.')';
263: }
264:
265: sub locallocaltime {
266: my $thistime=shift;
267: if ((¤t_language=~/^en/) || (!$lh)) {
268: return ''.localtime($thistime).&gettimezone();
269: } else {
270: my $format=$lh->maketext('date_locale');
271: if ($format eq 'date_locale') {
272: return ''.localtime($thistime);
273: }
274: my ($seconds,$minutes,$twentyfour,$day,$mon,$year,$wday,$yday,$isdst)=
275: localtime($thistime);
276: my $month=(split(/\,/,$lh->maketext('date_months')))[$mon];
277: my $weekday=(split(/\,/,$lh->maketext('date_days')))[$wday];
278: if ($seconds<10) {
279: $seconds='0'.$seconds;
280: }
281: if ($minutes<10) {
282: $minutes='0'.$minutes;
283: }
284: $year+=1900;
285: my $twelve=$twentyfour;
286: my $ampm;
287: if ($twelve>12) {
288: $twelve-=12;
289: $ampm=$lh->maketext('date_pm');
290: } else {
291: $ampm=$lh->maketext('date_am');
292: }
293: foreach
294: ('seconds','minutes','twentyfour','twelve','day','year',
295: 'month','weekday','ampm') {
296: $format=~s/\$$_/eval('$'.$_)/gse;
297: }
298: return $format.&gettimezone();
299: }
300: }
301:
302: # ==================== Normalize string (reduce fragility in the lexicon files)
303:
304: # This normalizes a string to reduce fragility in the lexicon files of
305: # huge messages (such as are used by the helper), and allow useful
306: # formatting: reduce all consecutive whitespace to a single space,
307: # and remove all HTML
308: sub normalize_string {
309: my $s = shift;
310: $s =~ s/\s+/ /g;
311: $s =~ s/<[^>]+>//g;
312: # Pop off beginning or ending spaces, which aren't good
313: $s =~ s/^\s+//;
314: $s =~ s/\s+$//;
315: return $s;
316: }
317:
318: # alias for normalize_string; recommend using it only in the lexicon
319: sub ns {
320: return normalize_string(@_);
321: }
322:
323: # mtn: call the mt function and the normalization function easily.
324: # Returns original non-normalized string if there was no translation
325: sub mtn (@) {
326: my @args = @_; # don't want to modify caller's string; if we
327: # didn't care about that we could set $_[0]
328: # directly
329: $args[0] = normalize_string($args[0]);
330: my $translation = &mt(@args);
331: if ($translation ne $args[0]) {
332: return $translation;
333: } else {
334: return $_[0];
335: }
336: }
337:
338: # ---------------------------------------------------- Replace MT{...} in files
339:
340: sub transstatic {
341: my $strptr=shift;
342: $$strptr=~s/MT\{([^\}]*)\}/&mt($1)/gse;
343: }
344:
345: # ----------------------------------------------- Handler Routine /adm/localize
346: sub handler {
347: my $r=shift;
348: &Apache::lonlocal::get_language_handle($r);
349: &Apache::loncommon::content_type($r,'text/html');
350: $r->send_http_header;
351: return OK if $r->header_only;
352:
353: my $uri=$r->uri;
354: $uri=~s/^\/adm\/localize//;
355: my $fn=$Apache::lonnet::perlvar{'lonDocRoot'}.$uri;
356:
357: my $file=&Apache::lonnet::getfile($fn);
358: &transstatic(\$file);
359: $r->print($file);
360: return OK;
361: }
362:
363: 1;
364:
365: __END__
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