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// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// limitations under the License.
// ECMAScript 402 API implementation is broken into separate files for
// each service. The build system combines them together into one
// Intl namespace.
/**
* Canonicalizes the language tag, or throws in case the tag is invalid.
*/
function canonicalizeLanguageTag(localeID) {
native function NativeJSCanonicalizeLanguageTag();
// null is typeof 'object' so we have to do extra check.
if (typeof localeID !== 'string' && typeof localeID !== 'object' ||
localeID === null) {
throw new TypeError('Language ID should be string or object.');
}
var localeString = String(localeID);
if (isValidLanguageTag(localeString) === false) {
throw new RangeError('Invalid language tag: ' + localeString);
}
// This call will strip -kn but not -kn-true extensions.
// ICU bug filled - http://bugs.icu-project.org/trac/ticket/9265.
// TODO(cira): check if -u-kn-true-kc-true-kh-true still throws after
// upgrade to ICU 4.9.
var tag = NativeJSCanonicalizeLanguageTag(localeString);
if (tag === 'invalid-tag') {
throw new RangeError('Invalid language tag: ' + localeString);
}
return tag;
}
/**
* Returns an array where all locales are canonicalized and duplicates removed.
* Throws on locales that are not well formed BCP47 tags.
*/
function initializeLocaleList(locales) {
var seen = [];
if (locales === undefined) {
// Constructor is called without arguments.
seen = [];
} else {
// We allow single string localeID.
if (typeof locales === 'string') {
seen.push(canonicalizeLanguageTag(locales));
return freezeArray(seen);
}
var o = toObject(locales);
// Converts it to UInt32 (>>> is shr on 32bit integers).
var len = o.length >>> 0;
for (var k = 0; k < len; k++) {
if (k in o) {
var value = o[k];
var tag = canonicalizeLanguageTag(value);
if (seen.indexOf(tag) === -1) {
seen.push(tag);
}
}
}
}
return freezeArray(seen);
}
/**
* Validates the language tag. Section 2.2.9 of the bcp47 spec
* defines a valid tag.
*
* ICU is too permissible and lets invalid tags, like
* hant-cmn-cn, through.
*
* Returns false if the language tag is invalid.
*/
function isValidLanguageTag(locale) {
// Check if it's well-formed, including grandfadered tags.
if (LANGUAGE_TAG_RE.test(locale) === false) {
return false;
}
// Just return if it's a x- form. It's all private.
if (locale.indexOf('x-') === 0) {
return true;
}
// Check if there are any duplicate variants or singletons (extensions).
// Remove private use section.
locale = locale.split(/-x-/)[0];
// Skip language since it can match variant regex, so we start from 1.
// We are matching i-klingon here, but that's ok, since i-klingon-klingon
// is not valid and would fail LANGUAGE_TAG_RE test.
var variants = [];
var extensions = [];
var parts = locale.split(/-/);
for (var i = 1; i < parts.length; i++) {
var value = parts[i];
if (LANGUAGE_VARIANT_RE.test(value) === true && extensions.length === 0) {
if (variants.indexOf(value) === -1) {
variants.push(value);
} else {
return false;
}
}
if (LANGUAGE_SINGLETON_RE.test(value) === true) {
if (extensions.indexOf(value) === -1) {
extensions.push(value);
} else {
return false;
}
}
}
return true;
}
/**
* Builds a regular expresion that validates the language tag
* against bcp47 spec.
* Uses http://tools.ietf.org/html/bcp47, section 2.1, ABNF.
* Runs on load and initializes the global REs.
*/
(function() {
var alpha = '[a-zA-Z]';
var digit = '[0-9]';
var alphanum = '(' + alpha + '|' + digit + ')';
var regular = '(art-lojban|cel-gaulish|no-bok|no-nyn|zh-guoyu|zh-hakka|' +
'zh-min|zh-min-nan|zh-xiang)';
var irregular = '(en-GB-oed|i-ami|i-bnn|i-default|i-enochian|i-hak|' +
'i-klingon|i-lux|i-mingo|i-navajo|i-pwn|i-tao|i-tay|' +
'i-tsu|sgn-BE-FR|sgn-BE-NL|sgn-CH-DE)';
var grandfathered = '(' + irregular + '|' + regular + ')';
var privateUse = '(x(-' + alphanum + '{1,8})+)';
var singleton = '(' + digit + '|[A-WY-Za-wy-z])';
LANGUAGE_SINGLETON_RE = new RegExp('^' + singleton + '$', 'i');
var extension = '(' + singleton + '(-' + alphanum + '{2,8})+)';
var variant = '(' + alphanum + '{5,8}|(' + digit + alphanum + '{3}))';
LANGUAGE_VARIANT_RE = new RegExp('^' + variant + '$', 'i');
var region = '(' + alpha + '{2}|' + digit + '{3})';
var script = '(' + alpha + '{4})';
var extLang = '(' + alpha + '{3}(-' + alpha + '{3}){0,2})';
var language = '(' + alpha + '{2,3}(-' + extLang + ')?|' + alpha + '{4}|' +
alpha + '{5,8})';
var langTag = language + '(-' + script + ')?(-' + region + ')?(-' +
variant + ')*(-' + extension + ')*(-' + privateUse + ')?';
var languageTag =
'^(' + langTag + '|' + privateUse + '|' + grandfathered + ')$';
LANGUAGE_TAG_RE = new RegExp(languageTag, 'i');
})();
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