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.
4
5 #include "ui/base/l10n/l10n_util_plurals.h"
6
7 #include "base/logging.h"
8 #include "base/memory/scoped_ptr.h"
9 #include "ui/base/l10n/l10n_util.h"
10
11 namespace l10n_util {
12
BuildPluralRules()13 scoped_ptr<icu::PluralRules> BuildPluralRules() {
14 UErrorCode err = U_ZERO_ERROR;
15 scoped_ptr<icu::PluralRules> rules(
16 icu::PluralRules::forLocale(icu::Locale::getDefault(), err));
17 if (U_FAILURE(err)) {
18 err = U_ZERO_ERROR;
19 icu::UnicodeString fallback_rules("one: n is 1", -1, US_INV);
20 rules.reset(icu::PluralRules::createRules(fallback_rules, err));
21 DCHECK(U_SUCCESS(err));
22 }
23 return rules.Pass();
24 }
25
BuildPluralFormat(const std::vector<int> & message_ids)26 scoped_ptr<icu::PluralFormat> BuildPluralFormat(
27 const std::vector<int>& message_ids) {
28 const icu::UnicodeString kKeywords[] = {
29 UNICODE_STRING_SIMPLE("other"),
30 UNICODE_STRING_SIMPLE("one"),
31 UNICODE_STRING_SIMPLE("zero"),
32 UNICODE_STRING_SIMPLE("two"),
33 UNICODE_STRING_SIMPLE("few"),
34 UNICODE_STRING_SIMPLE("many"),
35 };
36 DCHECK_EQ(message_ids.size(), arraysize(kKeywords));
37 UErrorCode err = U_ZERO_ERROR;
38 scoped_ptr<icu::PluralRules> rules(BuildPluralRules());
39
40 icu::UnicodeString pattern;
41 for (size_t i = 0; i < arraysize(kKeywords); ++i) {
42 int msg_id = message_ids[i];
43 std::string sub_pattern = GetStringUTF8(msg_id);
44 // NA means this keyword is not used in the current locale.
45 // Even if a translator translated for this keyword, we do not
46 // use it unless it's 'other' (i=0) or it's defined in the rules
47 // for the current locale. Special-casing of 'other' will be removed
48 // once ICU's isKeyword is fixed to return true for isKeyword('other').
49 if (sub_pattern.compare("NA") != 0 &&
50 (i == 0 || rules->isKeyword(kKeywords[i]))) {
51 pattern += kKeywords[i];
52 pattern += UNICODE_STRING_SIMPLE("{");
53 pattern += icu::UnicodeString(sub_pattern.c_str(), "UTF-8");
54 pattern += UNICODE_STRING_SIMPLE("}");
55 }
56 }
57 scoped_ptr<icu::PluralFormat> format = scoped_ptr<icu::PluralFormat>(
58 new icu::PluralFormat(*rules, pattern, err));
59 if (!U_SUCCESS(err)) {
60 return scoped_ptr<icu::PluralFormat>();
61 }
62 return format.Pass();
63 }
64
65 } // namespace l10n_util
66