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[chromium-blink-merge.git] / ui / base / l10n / l10n_util_plurals.cc
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1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "ui/base/l10n/l10n_util_plurals.h"
7 #include "base/memory/scoped_ptr.h"
8 #include "ui/base/l10n/l10n_util.h"
10 namespace l10n_util {
12 scoped_ptr<icu::PluralRules> BuildPluralRules() {
13 UErrorCode err = U_ZERO_ERROR;
14 scoped_ptr<icu::PluralRules> rules(
15 icu::PluralRules::forLocale(icu::Locale::getDefault(), err));
16 if (U_FAILURE(err)) {
17 err = U_ZERO_ERROR;
18 icu::UnicodeString fallback_rules("one: n is 1", -1, US_INV);
19 rules.reset(icu::PluralRules::createRules(fallback_rules, err));
20 DCHECK(U_SUCCESS(err));
22 return rules.Pass();
25 scoped_ptr<icu::PluralFormat> BuildPluralFormat(
26 const std::vector<int>& message_ids) {
27 const icu::UnicodeString kKeywords[] = {
28 UNICODE_STRING_SIMPLE("other"),
29 UNICODE_STRING_SIMPLE("one"),
30 UNICODE_STRING_SIMPLE("zero"),
31 UNICODE_STRING_SIMPLE("two"),
32 UNICODE_STRING_SIMPLE("few"),
33 UNICODE_STRING_SIMPLE("many"),
35 DCHECK_EQ(message_ids.size(), arraysize(kKeywords));
36 UErrorCode err = U_ZERO_ERROR;
37 scoped_ptr<icu::PluralRules> rules(BuildPluralRules());
39 icu::UnicodeString pattern;
40 for (size_t i = 0; i < arraysize(kKeywords); ++i) {
41 int msg_id = message_ids[i];
42 std::string sub_pattern = GetStringUTF8(msg_id);
43 // NA means this keyword is not used in the current locale.
44 // Even if a translator translated for this keyword, we do not
45 // use it unless it's 'other' (i=0) or it's defined in the rules
46 // for the current locale. Special-casing of 'other' will be removed
47 // once ICU's isKeyword is fixed to return true for isKeyword('other').
48 if (sub_pattern.compare("NA") != 0 &&
49 (i == 0 || rules->isKeyword(kKeywords[i]))) {
50 pattern += kKeywords[i];
51 pattern += UNICODE_STRING_SIMPLE("{");
52 pattern += icu::UnicodeString(sub_pattern.c_str(), "UTF-8");
53 pattern += UNICODE_STRING_SIMPLE("}");
56 scoped_ptr<icu::PluralFormat> format = scoped_ptr<icu::PluralFormat>(
57 new icu::PluralFormat(*rules, pattern, err));
58 if (!U_SUCCESS(err)) {
59 return scoped_ptr<icu::PluralFormat>();
61 return format.Pass();
64 } // namespace l10n_util