2 Pure Javascript implementation of Uniforum message translation.
3 Copyright (C) 2008 Joshua I. Miller <unrtst@cpan.org>, all rights reserved
5 This program is free software; you can redistribute it and/or modify it
6 under the terms of the GNU Library General Public License as published
7 by the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
22 Javascript Gettext - Javascript implemenation of GNU Gettext API.
26 // //////////////////////////////////////////////////////////
27 // Optimum caching way
28 <script language="javascript" src="/path/LC_MESSAGES/myDomain.json"></script>
29 <script language="javascript" src="/path/Gettext.js'></script>
31 // assuming myDomain.json defines variable json_locale_data
32 var params = { "domain" : "myDomain",
33 "locale_data" : json_locale_data
35 var gt = new Gettext(params);
36 // create a shortcut if you'd like
37 function _ (msgid) { return gt.gettext(msgid); }
38 alert(_("some string"));
39 // or use fully named method
40 alert(gt.gettext("some string"));
41 // change to use a different "domain"
42 gt.textdomain("anotherDomain");
43 alert(gt.gettext("some string"));
46 // //////////////////////////////////////////////////////////
47 // The other way to load the language lookup is a "link" tag
48 // Downside is that not all browsers cache XMLHttpRequests the
49 // same way, so caching of the language data isn't guarenteed
51 // Upside is that it's easy to specify multiple files
52 <link rel="gettext" href="/path/LC_MESSAGES/myDomain.json" />
53 <script language="javascript" src="/path/Gettext.js'></script>
55 var gt = new Gettext({ "domain" : "myDomain" });
59 // //////////////////////////////////////////////////////////
60 // The reson the shortcuts aren't exported by default is because they'd be
61 // glued to the single domain you created. So, if you're adding i18n support
62 // to some js library, you should use it as so:
64 if (typeof(MyNamespace) == 'undefined') MyNamespace = {};
65 MyNamespace.MyClass = function () {
66 var gtParms = { "domain" : 'MyNamespace_MyClass' };
67 this.gt = new Gettext(gtParams);
70 MyNamespace.MyClass.prototype._ = function (msgid) {
71 return this.gt.gettext(msgid);
73 MyNamespace.MyClass.prototype.something = function () {
74 var myString = this._("this will get translated");
77 // //////////////////////////////////////////////////////////
78 // Adding the shortcuts to a global scope is easier. If that's
79 // ok in your app, this is certainly easier.
80 var myGettext = new Gettext({ 'domain' : 'myDomain' });
82 return myGettext.gettext(msgid);
86 // //////////////////////////////////////////////////////////
87 // Data structure of the json data
88 // NOTE: if you're loading via the <script> tag, you can only
89 // load one file, but it can contain multiple domains.
90 var json_locale_data = {
93 "header_key" : "header value",
94 "header_key" : "header value",
95 "msgid" : [ "msgid_plural", "msgstr", "msgstr_plural", "msgstr_pluralN" ],
96 "msgctxt\004msgid" : [ null, "msgstr" ],
104 This is a javascript implementation of GNU Gettext, providing internationalization support for javascript. It differs from existing javascript implementations in that it will support all current Gettext features (ex. plural and context support), and will also support loading language catalogs from .mo, .po, or preprocessed json files (converter included).
106 The locale initialization differs from that of GNU Gettext / POSIX. Rather than setting the category, domain, and paths, and letting the libs find the right file, you must explicitly load the file at some point. The "domain" will still be honored. Future versions may be expanded to include support for set_locale like features.
111 To install this module, simply copy the file lib/Gettext.js to a web accessable location, and reference it from your application.
116 Configure in one of two ways:
120 =item 1. Optimal. Load language definition from statically defined json data.
122 <script language="javascript" src="/path/locale/domain.json"></script>
129 "plural-forms" : "...",
132 // all the msgid strings and translations
133 "msgid" : [ "msgid_plural", "translation", "plural_translation" ],
136 // please see the included bin/po2json script for the details on this format
138 This method also allows you to use unsupported file formats, so long as you can parse them into the above format.
140 =item 2. Use AJAX to load language file.
142 Use XMLHttpRequest (actually, SJAX - syncronous) to load an external resource.
144 Supported external formats are:
148 =item * Javascript Object Notation (.json)
152 type=application/json
154 =item * Uniforum Portable Object (.po)
156 (see GNU Gettext's xgettext)
158 type=application/x-po
160 =item * Machine Object (compiled .po) (.mo)
162 NOTE: .mo format isn't actually supported just yet, but support is planned.
164 (see GNU Gettext's msgfmt)
166 type=application/x-mo
174 The following methods are implemented:
179 dgettext (domainname, msgid)
180 dcgettext (domainname, msgid, LC_MESSAGES)
181 ngettext (msgid, msgid_plural, count)
182 dngettext (domainname, msgid, msgid_plural, count)
183 dcngettext (domainname, msgid, msgid_plural, count, LC_MESSAGES)
184 pgettext (msgctxt, msgid)
185 dpgettext (domainname, msgctxt, msgid)
186 dcpgettext (domainname, msgctxt, msgid, LC_MESSAGES)
187 npgettext (msgctxt, msgid, msgid_plural, count)
188 dnpgettext (domainname, msgctxt, msgid, msgid_plural, count)
189 dcnpgettext (domainname, msgctxt, msgid, msgid_plural, count, LC_MESSAGES)
190 strargs (string, args_array)
193 =head2 new Gettext (args)
195 Several methods of loading locale data are included. You may specify a plugin or alternative method of loading data by passing the data in as the "locale_data" option. For example:
197 var get_locale_data = function () {
198 // plugin does whatever to populate locale_data
201 var gt = new Gettext( 'domain' : 'messages',
202 'locale_data' : get_locale_data() );
204 The above can also be used if locale data is specified in a statically included <SCRIPT> tag. Just specify the variable name in the call to new. Ex:
206 var gt = new Gettext( 'domain' : 'messages',
207 'locale_data' : json_locale_data_variable );
209 Finally, you may load the locale data by referencing it in a <LINK> tag. Simply exclude the 'locale_data' option, and all <LINK rel="gettext" ...> items will be tried. The <LINK> should be specified as:
211 <link rel="gettext" type="application/json" href="/path/to/file.json">
212 <link rel="gettext" type="text/javascript" href="/path/to/file.json">
213 <link rel="gettext" type="application/x-po" href="/path/to/file.po">
214 <link rel="gettext" type="application/x-mo" href="/path/to/file.mo">
222 The Gettext domain, not www.whatev.com. It's usually your applications basename. If the .po file was "myapp.po", this would be "myapp".
226 Raw locale data (in json structure). If specified, from_link data will be ignored.
234 Gettext = function (args) {
235 this.domain = 'messages';
236 // locale_data will be populated from <link...> if not specified in args
237 this.locale_data = undefined;
240 var options = [ "domain", "locale_data" ];
241 if (this.isValidObject(args)) {
242 for (var i in args) {
243 for (var j=0; j<options.length; j++) {
244 if (i == options[j]) {
245 // don't set it if it's null or undefined
246 if (this.isValidObject(args[i]))
254 // try to load the lang file from somewhere
255 this.try_load_lang();
260 Gettext.context_glue = "\004";
261 Gettext._locale_data = {};
263 Gettext.prototype.try_load_lang = function() {
264 // check to see if language is statically included
265 if (typeof(this.locale_data) != 'undefined') {
266 // we're going to reformat it, and overwrite the variable
267 var locale_copy = this.locale_data;
268 this.locale_data = undefined;
269 this.parse_locale_data(locale_copy);
271 if (typeof(Gettext._locale_data[this.domain]) == 'undefined') {
272 throw new Error("Error: Gettext 'locale_data' does not contain the domain '"+this.domain+"'");
277 // try loading from JSON
279 var lang_link = this.get_lang_refs();
281 if (typeof(lang_link) == 'object' && lang_link.length > 0) {
282 // NOTE: there will be a delay here, as this is async.
283 // So, any i18n calls made right after page load may not
285 // XXX: we may want to see if we can "fix" this behavior
286 for (var i=0; i<lang_link.length; i++) {
287 var link = lang_link[i];
288 if (link.type == 'application/json') {
289 if (! this.try_load_lang_json(link.href) ) {
290 throw new Error("Error: Gettext 'try_load_lang_json' failed. Unable to exec xmlhttprequest for link ["+link.href+"]");
292 } else if (link.type == 'application/x-po') {
293 if (! this.try_load_lang_po(link.href) ) {
294 throw new Error("Error: Gettext 'try_load_lang_po' failed. Unable to exec xmlhttprequest for link ["+link.href+"]");
297 // TODO: implement the other types (.mo)
298 throw new Error("TODO: link type ["+link.type+"] found, and support is planned, but not implemented at this time.");
304 // This takes the bin/po2json'd data, and moves it into an internal form
305 // for use in our lib, and puts it in our object as:
306 // Gettext._locale_data = {
308 // head : { headfield : headvalue },
310 // msgid : [ msgid_plural, msgstr, msgstr_plural ],
312 Gettext.prototype.parse_locale_data = function(locale_data) {
313 if (typeof(Gettext._locale_data) == 'undefined') {
314 Gettext._locale_data = { };
317 // suck in every domain defined in the supplied data
318 for (var domain in locale_data) {
319 // skip empty specs (flexibly)
320 if ((! locale_data.hasOwnProperty(domain)) || (! this.isValidObject(locale_data[domain])))
322 // skip if it has no msgid's
323 var has_msgids = false;
324 for (var msgid in locale_data[domain]) {
328 if (! has_msgids) continue;
330 // grab shortcut to data
331 var data = locale_data[domain];
333 // if they specifcy a blank domain, default to "messages"
334 if (domain == "") domain = "messages";
335 // init the data structure
336 if (! this.isValidObject(Gettext._locale_data[domain]) )
337 Gettext._locale_data[domain] = { };
338 if (! this.isValidObject(Gettext._locale_data[domain].head) )
339 Gettext._locale_data[domain].head = { };
340 if (! this.isValidObject(Gettext._locale_data[domain].msgs) )
341 Gettext._locale_data[domain].msgs = { };
343 for (var key in data) {
345 var header = data[key];
346 for (var head in header) {
347 var h = head.toLowerCase();
348 Gettext._locale_data[domain].head[h] = header[head];
351 Gettext._locale_data[domain].msgs[key] = data[key];
356 // build the plural forms function
357 for (var domain in Gettext._locale_data) {
358 if (this.isValidObject(Gettext._locale_data[domain].head['plural-forms']) &&
359 typeof(Gettext._locale_data[domain].head.plural_func) == 'undefined') {
361 var plural_forms = Gettext._locale_data[domain].head['plural-forms'];
362 var pf_re = new RegExp('^(\\s*nplurals\\s*=\\s*[0-9]+\\s*;\\s*plural\\s*=\\s*(?:\\s|[-\\?\\|&=!<>+*/%:;a-zA-Z0-9_\(\)])+)', 'm');
363 if (pf_re.test(plural_forms)) {
364 //ex english: "Plural-Forms: nplurals=2; plural=(n != 1);\n"
365 //pf = "nplurals=2; plural=(n != 1);";
366 //ex russian: nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10< =4 && (n%100<10 or n%100>=20) ? 1 : 2)
367 //pf = "nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2)";
369 var pf = Gettext._locale_data[domain].head['plural-forms'];
370 if (! /;\s*$/.test(pf)) pf = pf.concat(';');
371 /* We used to use eval, but it seems IE has issues with it.
372 * We now use "new Function", though it carries a slightly
373 * bigger performance hit.
374 var code = 'function (n) { var plural; var nplurals; '+pf+' return { "nplural" : nplurals, "plural" : (plural === true ? 1 : plural ? plural : 0) }; };';
375 Gettext._locale_data[domain].head.plural_func = eval("("+code+")");
377 var code = 'var plural; var nplurals; '+pf+' return { "nplural" : nplurals, "plural" : (plural === true ? 1 : plural ? plural : 0) };';
378 Gettext._locale_data[domain].head.plural_func = new Function("n", code);
380 throw new Error("Syntax error in language file. Plural-Forms header is invalid ["+plural_forms+"]");
383 // default to english plural form
384 } else if (typeof(Gettext._locale_data[domain].head.plural_func) == 'undefined') {
385 Gettext._locale_data[domain].head.plural_func = function (n) {
386 var p = (n != 1) ? 1 : 0;
387 return { 'nplural' : 2, 'plural' : p };
389 } // else, plural_func already created
396 // try_load_lang_po : do an ajaxy call to load in the .po lang defs
397 Gettext.prototype.try_load_lang_po = function(uri) {
398 var data = this.sjax(uri);
401 var domain = this.uri_basename(uri);
402 var parsed = this.parse_po(data);
405 // munge domain into/outof header
407 if (! parsed[""]) parsed[""] = {};
408 if (! parsed[""]["domain"]) parsed[""]["domain"] = domain;
409 domain = parsed[""]["domain"];
412 this.parse_locale_data(rv);
418 Gettext.prototype.uri_basename = function(uri) {
420 if (rv = uri.match(/^(.*\/)?(.*)/)) {
422 if (ext_strip = rv[2].match(/^(.*)\..+$/))
431 Gettext.prototype.parse_po = function(data) {
436 var lines = data.split("\n");
437 for (var i=0; i<lines.length; i++) {
439 lines[i] = lines[i].replace(/(\n|\r)+$/, '');
443 // Empty line / End of an entry.
444 if (/^$/.test(lines[i])) {
445 if (typeof(buffer['msgid']) != 'undefined') {
446 var msg_ctxt_id = (typeof(buffer['msgctxt']) != 'undefined' &&
447 buffer['msgctxt'].length) ?
448 buffer['msgctxt']+Gettext.context_glue+buffer['msgid'] :
450 var msgid_plural = (typeof(buffer['msgid_plural']) != 'undefined' &&
451 buffer['msgid_plural'].length) ?
452 buffer['msgid_plural'] :
455 // find msgstr_* translations and push them on
457 for (var str in buffer) {
459 if (match = str.match(/^msgstr_(\d+)/))
460 trans[parseInt(match[1])] = buffer[str];
462 trans.unshift(msgid_plural);
464 // only add it if we've got a translation
465 // NOTE: this doesn't conform to msgfmt specs
466 if (trans.length > 1) rv[msg_ctxt_id] = trans;
473 } else if (/^#/.test(lines[i])) {
477 } else if (match = lines[i].match(/^msgctxt\s+(.*)/)) {
478 lastbuffer = 'msgctxt';
479 buffer[lastbuffer] = this.parse_po_dequote(match[1]);
482 } else if (match = lines[i].match(/^msgid\s+(.*)/)) {
483 lastbuffer = 'msgid';
484 buffer[lastbuffer] = this.parse_po_dequote(match[1]);
487 } else if (match = lines[i].match(/^msgid_plural\s+(.*)/)) {
488 lastbuffer = 'msgid_plural';
489 buffer[lastbuffer] = this.parse_po_dequote(match[1]);
492 } else if (match = lines[i].match(/^msgstr\s+(.*)/)) {
493 lastbuffer = 'msgstr_0';
494 buffer[lastbuffer] = this.parse_po_dequote(match[1]);
496 // msgstr[0] (treak like msgstr)
497 } else if (match = lines[i].match(/^msgstr\[0\]\s+(.*)/)) {
498 lastbuffer = 'msgstr_0';
499 buffer[lastbuffer] = this.parse_po_dequote(match[1]);
502 } else if (match = lines[i].match(/^msgstr\[(\d+)\]\s+(.*)/)) {
503 lastbuffer = 'msgstr_'+match[1];
504 buffer[lastbuffer] = this.parse_po_dequote(match[2]);
507 } else if (/^"/.test(lines[i])) {
508 buffer[lastbuffer] += this.parse_po_dequote(lines[i]);
512 errors.push("Strange line ["+i+"] : "+lines[i]);
517 // handle the final entry
518 if (typeof(buffer['msgid']) != 'undefined') {
519 var msg_ctxt_id = (typeof(buffer['msgctxt']) != 'undefined' &&
520 buffer['msgctxt'].length) ?
521 buffer['msgctxt']+Gettext.context_glue+buffer['msgid'] :
523 var msgid_plural = (typeof(buffer['msgid_plural']) != 'undefined' &&
524 buffer['msgid_plural'].length) ?
525 buffer['msgid_plural'] :
528 // find msgstr_* translations and push them on
530 for (var str in buffer) {
532 if (match = str.match(/^msgstr_(\d+)/))
533 trans[parseInt(match[1])] = buffer[str];
535 trans.unshift(msgid_plural);
537 // only add it if we've got a translation
538 // NOTE: this doesn't conform to msgfmt specs
539 if (trans.length > 1) rv[msg_ctxt_id] = trans;
546 // parse out the header
547 if (rv[""] && rv[""][1]) {
549 var hlines = rv[""][1].split(/\\n/);
550 for (var i=0; i<hlines.length; i++) {
551 if (! hlines.length) continue;
553 var pos = hlines[i].indexOf(':', 0);
555 var key = hlines[i].substring(0, pos);
556 var val = hlines[i].substring(pos +1);
557 var keylow = key.toLowerCase();
559 if (cur[keylow] && cur[keylow].length) {
560 errors.push("SKIPPING DUPLICATE HEADER LINE: "+hlines[i]);
561 } else if (/#-#-#-#-#/.test(keylow)) {
562 errors.push("SKIPPING ERROR MARKER IN HEADER: "+hlines[i]);
564 // remove begining spaces if any
565 val = val.replace(/^\s+/, '');
570 errors.push("PROBLEM LINE IN HEADER: "+hlines[i]);
575 // replace header string with assoc array
581 // TODO: XXX: if there are errors parsing, what do we want to do?
582 // GNU Gettext silently ignores errors. So will we.
583 // alert( "Errors parsing po file:\n" + errors.join("\n") );
589 Gettext.prototype.parse_po_dequote = function(str) {
591 if (match = str.match(/^"(.*)"/)) {
594 // unescale all embedded quotes (fixes bug #17504)
595 str = str.replace(/\\"/g, "\"");
600 // try_load_lang_json : do an ajaxy call to load in the lang defs
601 Gettext.prototype.try_load_lang_json = function(uri) {
602 var data = this.sjax(uri);
605 var rv = this.JSON(data);
606 this.parse_locale_data(rv);
611 // this finds all <link> tags, filters out ones that match our
612 // specs, and returns a list of hashes of those
613 Gettext.prototype.get_lang_refs = function() {
614 var langs = new Array();
615 var links = document.getElementsByTagName("link");
616 // find all <link> tags in dom; filter ours
617 for (var i=0; i<links.length; i++) {
618 if (links[i].rel == 'gettext' && links[i].href) {
619 if (typeof(links[i].type) == 'undefined' ||
620 links[i].type == '') {
621 if (/\.json$/i.test(links[i].href)) {
622 links[i].type = 'application/json';
623 } else if (/\.js$/i.test(links[i].href)) {
624 links[i].type = 'application/json';
625 } else if (/\.po$/i.test(links[i].href)) {
626 links[i].type = 'application/x-po';
627 } else if (/\.mo$/i.test(links[i].href)) {
628 links[i].type = 'application/x-mo';
630 throw new Error("LINK tag with rel=gettext found, but the type and extension are unrecognized.");
634 links[i].type = links[i].type.toLowerCase();
635 if (links[i].type == 'application/json') {
636 links[i].type = 'application/json';
637 } else if (links[i].type == 'text/javascript') {
638 links[i].type = 'application/json';
639 } else if (links[i].type == 'application/x-po') {
640 links[i].type = 'application/x-po';
641 } else if (links[i].type == 'application/x-mo') {
642 links[i].type = 'application/x-mo';
644 throw new Error("LINK tag with rel=gettext found, but the type attribute ["+links[i].type+"] is unrecognized.");
647 langs.push(links[i]);
656 =head2 textdomain( domain )
658 Set domain for future gettext() calls
660 A message domain is a set of translatable msgid messages. Usually,
661 every software package has its own message domain. The domain name is
662 used to determine the message catalog where a translation is looked up;
663 it must be a non-empty string.
665 The current message domain is used by the gettext, ngettext, pgettext,
666 npgettext functions, and by the dgettext, dcgettext, dngettext, dcngettext,
667 dpgettext, dcpgettext, dnpgettext and dcnpgettext functions when called
668 with a NULL domainname argument.
670 If domainname is not NULL, the current message domain is set to
673 If domainname is undefined, null, or empty string, the function returns
674 the current message domain.
676 If successful, the textdomain function returns the current message
677 domain, after possibly changing it. (ie. if you set a new domain, the
678 value returned will NOT be the previous domain).
683 Gettext.prototype.textdomain = function (domain) {
684 if (domain && domain.length) this.domain = domain;
690 =head2 gettext( MSGID )
692 Returns the translation for B<MSGID>. Example:
694 alert( gt.gettext("Hello World!\n") );
696 If no translation can be found, the unmodified B<MSGID> is returned,
697 i. e. the function can I<never> fail, and will I<never> mess up your
700 One common mistake is to interpolate a variable into the string like this:
702 var translated = gt.gettext("Hello " + full_name);
704 The interpolation will happen before it's passed to gettext, and it's
705 unlikely you'll have a translation for every "Hello Tom" and "Hello Dick"
706 and "Hellow Harry" that may arise.
708 Use C<strargs()> (see below) to solve this problem:
710 var translated = Gettext.strargs( gt.gettext("Hello %1"), [full_name] );
712 This is espeically useful when multiple replacements are needed, as they
713 may not appear in the same order within the translation. As an English to
716 Expected result: "This is the red ball"
717 English: "This is the %1 %2"
718 French: "C'est le %2 %1"
719 Code: Gettext.strargs( gt.gettext("This is the %1 %2"), ["red", "ball"] );
721 (The example is stupid because neither color nor thing will get
722 translated here ...).
724 =head2 dgettext( TEXTDOMAIN, MSGID )
726 Like gettext(), but retrieves the message for the specified
727 B<TEXTDOMAIN> instead of the default domain. In case you wonder what
728 a textdomain is, see above section on the textdomain() call.
730 =head2 dcgettext( TEXTDOMAIN, MSGID, CATEGORY )
732 Like dgettext() but retrieves the message from the specified B<CATEGORY>
733 instead of the default category C<LC_MESSAGES>.
735 NOTE: the categories are really useless in javascript context. This is
736 here for GNU Gettext API compatability. In practice, you'll never need
737 to use this. This applies to all the calls including the B<CATEGORY>.
740 =head2 ngettext( MSGID, MSGID_PLURAL, COUNT )
742 Retrieves the correct translation for B<COUNT> items. In legacy software
743 you will often find something like:
745 alert( count + " file(s) deleted.\n" );
749 printf(count + " file%s deleted.\n", $count == 1 ? '' : 's');
751 I<NOTE: javascript lacks a builtin printf, so the above isn't a working example>
753 The first example looks awkward, the second will only work in English
754 and languages with similar plural rules. Before ngettext() was introduced,
755 the best practice for internationalized programs was:
758 alert( gettext("One file deleted.\n") );
760 printf( gettext("%d files deleted.\n"), count );
763 This is a nuisance for the programmer and often still not sufficient
764 for an adequate translation. Many languages have completely different
765 ideas on numerals. Some (French, Italian, ...) treat 0 and 1 alike,
766 others make no distinction at all (Japanese, Korean, Chinese, ...),
767 others have two or more plural forms (Russian, Latvian, Czech,
768 Polish, ...). The solution is:
770 printf( ngettext("One file deleted.\n",
771 "%d files deleted.\n",
772 count), // argument to ngettext!
773 count); // argument to printf!
775 In English, or if no translation can be found, the first argument
776 (B<MSGID>) is picked if C<count> is one, the second one otherwise.
777 For other languages, the correct plural form (of 1, 2, 3, 4, ...)
778 is automatically picked, too. You don't have to know anything about
779 the plural rules in the target language, ngettext() will take care
782 This is most of the time sufficient but you will have to prove your
783 creativity in cases like
785 "%d file(s) deleted, and %d file(s) created.\n"
787 That said, javascript lacks C<printf()> support. Supplied with Gettext.js
788 is the C<strargs()> method, which can be used for these cases:
790 Gettext.strargs( gt.ngettext( "One file deleted.\n",
791 "%d files deleted.\n",
792 count), // argument to ngettext!
793 count); // argument to strargs!
795 NOTE: the variable replacement isn't done for you, so you must
796 do it yourself as in the above.
798 =head2 dngettext( TEXTDOMAIN, MSGID, MSGID_PLURAL, COUNT )
800 Like ngettext() but retrieves the translation from the specified
801 textdomain instead of the default domain.
803 =head2 dcngettext( TEXTDOMAIN, MSGID, MSGID_PLURAL, COUNT, CATEGORY )
805 Like dngettext() but retrieves the translation from the specified
806 category, instead of the default category C<LC_MESSAGES>.
809 =head2 pgettext( MSGCTXT, MSGID )
811 Returns the translation of MSGID, given the context of MSGCTXT.
813 Both items are used as a unique key into the message catalog.
815 This allows the translator to have two entries for words that may
816 translate to different foreign words based on their context. For
817 example, the word "View" may be a noun or a verb, which may be
818 used in a menu as File->View or View->Source.
820 alert( pgettext( "Verb: To View", "View" ) );
821 alert( pgettext( "Noun: A View", "View" ) );
823 The above will both lookup different entries in the message catalog.
825 In English, or if no translation can be found, the second argument
826 (B<MSGID>) is returned.
828 =head2 dpgettext( TEXTDOMAIN, MSGCTXT, MSGID )
830 Like pgettext(), but retrieves the message for the specified
831 B<TEXTDOMAIN> instead of the default domain.
833 =head2 dcpgettext( TEXTDOMAIN, MSGCTXT, MSGID, CATEGORY )
835 Like dpgettext() but retrieves the message from the specified B<CATEGORY>
836 instead of the default category C<LC_MESSAGES>.
839 =head2 npgettext( MSGCTXT, MSGID, MSGID_PLURAL, COUNT )
841 Like ngettext() with the addition of context as in pgettext().
843 In English, or if no translation can be found, the second argument
844 (MSGID) is picked if B<COUNT> is one, the third one otherwise.
846 =head2 dnpgettext( TEXTDOMAIN, MSGCTXT, MSGID, MSGID_PLURAL, COUNT )
848 Like npgettext() but retrieves the translation from the specified
849 textdomain instead of the default domain.
851 =head2 dcnpgettext( TEXTDOMAIN, MSGCTXT, MSGID, MSGID_PLURAL, COUNT, CATEGORY )
853 Like dnpgettext() but retrieves the translation from the specified
854 category, instead of the default category C<LC_MESSAGES>.
861 Gettext.prototype.gettext = function (msgid) {
866 return this.dcnpgettext(null, msgctxt, msgid, msgid_plural, n, category);
869 Gettext.prototype.dgettext = function (domain, msgid) {
874 return this.dcnpgettext(domain, msgctxt, msgid, msgid_plural, n, category);
877 Gettext.prototype.dcgettext = function (domain, msgid, category) {
881 return this.dcnpgettext(domain, msgctxt, msgid, msgid_plural, n, category);
885 Gettext.prototype.ngettext = function (msgid, msgid_plural, n) {
888 return this.dcnpgettext(null, msgctxt, msgid, msgid_plural, n, category);
891 Gettext.prototype.dngettext = function (domain, msgid, msgid_plural, n) {
894 return this.dcnpgettext(domain, msgctxt, msgid, msgid_plural, n, category);
897 Gettext.prototype.dcngettext = function (domain, msgid, msgid_plural, n, category) {
899 return this.dcnpgettext(domain, msgctxt, msgid, msgid_plural, n, category, category);
903 Gettext.prototype.pgettext = function (msgctxt, msgid) {
907 return this.dcnpgettext(null, msgctxt, msgid, msgid_plural, n, category);
910 Gettext.prototype.dpgettext = function (domain, msgctxt, msgid) {
914 return this.dcnpgettext(domain, msgctxt, msgid, msgid_plural, n, category);
917 Gettext.prototype.dcpgettext = function (domain, msgctxt, msgid, category) {
920 return this.dcnpgettext(domain, msgctxt, msgid, msgid_plural, n, category);
924 Gettext.prototype.npgettext = function (msgctxt, msgid, msgid_plural, n) {
926 return this.dcnpgettext(null, msgctxt, msgid, msgid_plural, n, category);
929 Gettext.prototype.dnpgettext = function (domain, msgctxt, msgid, msgid_plural, n) {
931 return this.dcnpgettext(domain, msgctxt, msgid, msgid_plural, n, category);
934 // this has all the options, so we use it for all of them.
935 Gettext.prototype.dcnpgettext = function (domain, msgctxt, msgid, msgid_plural, n, category) {
936 if (! this.isValidObject(msgid)) return '';
938 var plural = this.isValidObject(msgid_plural);
939 var msg_ctxt_id = this.isValidObject(msgctxt) ? msgctxt+Gettext.context_glue+msgid : msgid;
941 var domainname = this.isValidObject(domain) ? domain :
942 this.isValidObject(this.domain) ? this.domain :
945 // category is always LC_MESSAGES. We ignore all else
946 var category_name = 'LC_MESSAGES';
949 var locale_data = new Array();
950 if (typeof(Gettext._locale_data) != 'undefined' &&
951 this.isValidObject(Gettext._locale_data[domainname])) {
952 locale_data.push( Gettext._locale_data[domainname] );
954 } else if (typeof(Gettext._locale_data) != 'undefined') {
955 // didn't find domain we're looking for. Search all of them.
956 for (var dom in Gettext._locale_data) {
957 locale_data.push( Gettext._locale_data[dom] );
963 var domain_used; // so we can find plural-forms if needed
964 if (locale_data.length) {
965 for (var i=0; i<locale_data.length; i++) {
966 var locale = locale_data[i];
967 if (this.isValidObject(locale.msgs[msg_ctxt_id])) {
968 // make copy of that array (cause we'll be destructive)
969 for (var j=0; j<locale.msgs[msg_ctxt_id].length; j++) {
970 trans[j] = locale.msgs[msg_ctxt_id][j];
972 trans.shift(); // throw away the msgid_plural
973 domain_used = locale;
975 // only break if found translation actually has a translation.
976 if ( trans.length > 0 && trans[0].length != 0 )
982 // default to english if we lack a match, or match has zero length
983 if ( trans.length == 0 || trans[0].length == 0 ) {
984 trans = [ msgid, msgid_plural ];
987 var translation = trans[0];
990 if (found && this.isValidObject(domain_used.head.plural_func) ) {
991 var rv = domain_used.head.plural_func(n);
992 if (! rv.plural) rv.plural = 0;
993 if (! rv.nplural) rv.nplural = 0;
994 // if plurals returned is out of bound for total plural forms
995 if (rv.nplural <= rv.plural) rv.plural = 0;
998 p = (n != 1) ? 1 : 0;
1000 if (this.isValidObject(trans[p]))
1001 translation = trans[p];
1010 =head2 strargs (string, argument_array)
1012 string : a string that potentially contains formatting characters.
1013 argument_array : an array of positional replacement values
1015 This is a utility method to provide some way to support positional parameters within a string, as javascript lacks a printf() method.
1017 The format is similar to printf(), but greatly simplified (ie. fewer features).
1019 Any percent signs followed by numbers are replaced with the corrosponding item from the B<argument_array>.
1023 var string = "%2 roses are red, %1 violets are blue";
1024 var args = new Array("10", "15");
1025 var result = Gettext.strargs(string, args);
1026 // result is "15 roses are red, 10 violets are blue"
1028 The format numbers are 1 based, so the first itme is %1.
1030 A lone percent sign may be escaped by preceeding it with another percent sign.
1032 A percent sign followed by anything other than a number or another percent sign will be passed through as is.
1034 Some more examples should clear up any abmiguity. The following were called with the orig string, and the array as Array("[one]", "[two]") :
1036 orig string "blah" becomes "blah"
1037 orig string "" becomes ""
1038 orig string "%%" becomes "%"
1039 orig string "%%%" becomes "%%"
1040 orig string "%%%%" becomes "%%"
1041 orig string "%%%%%" becomes "%%%"
1042 orig string "tom%%dick" becomes "tom%dick"
1043 orig string "thing%1bob" becomes "thing[one]bob"
1044 orig string "thing%1%2bob" becomes "thing[one][two]bob"
1045 orig string "thing%1asdf%2asdf" becomes "thing[one]asdf[two]asdf"
1046 orig string "%1%2%3" becomes "[one][two]"
1047 orig string "tom%1%%2%aDick" becomes "tom[one]%2%aDick"
1049 This is especially useful when using plurals, as the string will nearly always contain the number.
1051 It's also useful in translated strings where the translator may have needed to move the position of the parameters.
1056 Gettext.strargs( gt.ngettext('one banana', '%1 bananas', count), [count] );
1058 NOTE: this may be called as an instance method, or as a class method.
1061 var gt = new Gettext(params);
1062 gt.strargs(string, args);
1065 Gettext.strargs(string, args);
1070 /* utility method, since javascript lacks a printf */
1071 Gettext.strargs = function (str, args) {
1072 // make sure args is an array
1073 if ( null == args ||
1074 'undefined' == typeof(args) ) {
1076 } else if (args.constructor != Array) {
1080 // NOTE: javascript lacks support for zero length negative look-behind
1081 // in regex, so we must step through w/ index.
1082 // The perl equiv would simply be:
1083 // $string =~ s/(?<!\%)\%([0-9]+)/$args[$1]/g;
1084 // $string =~ s/\%\%/\%/g; # restore escaped percent signs
1088 var i = str.indexOf('%');
1091 // no more found. Append whatever remains
1097 // we found it, append everything up to that
1098 newstr += str.substr(0, i);
1100 // check for escpaed %%
1101 if (str.substr(i, 2) == '%%') {
1103 str = str.substr((i+2));
1105 // % followed by number
1106 } else if ( match_n = str.substr(i).match(/^%(\d+)/) ) {
1107 var arg_n = parseInt(match_n[1]);
1108 var length_n = match_n[1].length;
1109 if ( arg_n > 0 && args[arg_n -1] != null && typeof(args[arg_n -1]) != 'undefined' )
1110 newstr += args[arg_n -1];
1111 str = str.substr( (i + 1 + length_n) );
1113 // % followed by some other garbage - just remove the %
1116 str = str.substr((i+1));
1123 /* instance method wrapper of strargs */
1124 Gettext.prototype.strargs = function (str, args) {
1125 return Gettext.strargs(str, args);
1128 /* verify that something is an array */
1129 Gettext.prototype.isArray = function (thisObject) {
1130 return this.isValidObject(thisObject) && thisObject.constructor == Array;
1133 /* verify that an object exists and is valid */
1134 Gettext.prototype.isValidObject = function (thisObject) {
1135 if (null == thisObject) {
1137 } else if ('undefined' == typeof(thisObject) ) {
1144 Gettext.prototype.sjax = function (uri) {
1146 if (window.XMLHttpRequest) {
1147 xmlhttp = new XMLHttpRequest();
1148 } else if (navigator.userAgent.toLowerCase().indexOf('msie 5') != -1) {
1149 xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
1151 xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
1155 throw new Error("Your browser doesn't do Ajax. Unable to support external language files.");
1157 xmlhttp.open('GET', uri, false);
1158 try { xmlhttp.send(null); }
1159 catch (e) { return; }
1161 // we consider status 200 and 0 as ok.
1162 // 0 happens when we request local file, allowing this to run on local files
1163 var sjax_status = xmlhttp.status;
1164 if (sjax_status == 200 || sjax_status == 0) {
1165 return xmlhttp.responseText;
1167 var error = xmlhttp.statusText + " (Error " + xmlhttp.status + ")";
1168 if (xmlhttp.responseText.length) {
1169 error += "\n" + xmlhttp.responseText;
1176 Gettext.prototype.JSON = function (data) {
1177 return eval('(' + data + ')');
1185 These are some notes on the internals
1189 =item LOCALE CACHING
1191 Loaded locale data is currently cached class-wide. This means that if two scripts are both using Gettext.js, and both share the same gettext domain, that domain will only be loaded once. This will allow you to grab a new object many times from different places, utilize the same domain, and share a single translation file. The downside is that a domain won't be RE-loaded if a new object is instantiated on a domain that had already been instantiated.
1199 =item error handling
1201 Currently, there are several places that throw errors. In GNU Gettext, there are no fatal errors, which allows text to still be displayed regardless of how broken the environment becomes. We should evaluate and determine where we want to stand on that issue.
1203 =item syncronous only support (no ajax support)
1205 Currently, fetching language data is done purely syncronous, which means the page will halt while those files are fetched/loaded.
1207 This is often what you want, as then following translation requests will actually be translated. However, if all your calls are done dynamically (ie. error handling only or something), loading in the background may be more adventagous.
1209 It's still recommended to use the statically defined <script ...> method, which should have the same delay, but it will cache the result.
1211 =item domain support
1213 domain support while using shortcut methods like C<_('string')> or C<i18n('string')>.
1215 Under normal apps, the domain is usually set globally to the app, and a single language file is used. Under javascript, you may have multiple libraries or applications needing translation support, but the namespace is essentially global.
1217 It's recommended that your app initialize it's own shortcut with it's own domain. (See examples/wrapper/i18n.js for an example.)
1219 Basically, you'll want to accomplish something like this:
1221 // in some other .js file that needs i18n
1222 this.i18nObj = new i18n;
1223 this.i18n = this.i18nObj.init('domain');
1225 alert( this.i18n("string") );
1227 If you use this raw Gettext object, then this is all handled for you, as you have your own object then, and will be calling C<myGettextObject.gettext('string')> and such.
1232 May want to add encoding/reencoding stuff. See GNU iconv, or the perl module Locale::Recode from libintl-perl.
1237 =head1 COMPATABILITY
1239 This has been tested on the following browsers. It may work on others, but these are all those to which I have access.
1241 FF1.5, FF2, FF3, IE6, IE7, Opera9, Opera10, Safari3.1, Chrome
1244 *IE = Internet Explorer
1249 bin/po2json requires perl, and the perl modules Locale::PO and JSON.
1253 bin/po2json (included),
1254 examples/normal/index.html,
1255 examples/wrapper/i18n.html, examples/wrapper/i18n.js,
1256 Locale::gettext_pp(3pm), POSIX(3pm), gettext(1), gettext(3)
1260 Copyright (C) 2008, Joshua I. Miller E<lt>unrtst@cpan.orgE<gt>, all rights reserved. See the source code for details.