1 // Copyright (c) 2011 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 "chrome/browser/language_usage_metrics.h"
6
7 #include <algorithm>
8
9 #include "base/metrics/sparse_histogram.h"
10 #include "base/strings/string_tokenizer.h"
11 #include "base/strings/string_util.h"
12
13 namespace {
RecordAcceptLanguage(int language_code)14 void RecordAcceptLanguage(int language_code) {
15 UMA_HISTOGRAM_SPARSE_SLOWLY("LanguageUsage.AcceptLanguage",
16 language_code);
17 }
18 } // namespace
19
20 // static
RecordAcceptLanguages(const std::string & accept_languages)21 void LanguageUsageMetrics::RecordAcceptLanguages(
22 const std::string& accept_languages) {
23 std::set<int> languages;
24 ParseAcceptLanguages(accept_languages, &languages);
25 std::for_each(languages.begin(), languages.end(), RecordAcceptLanguage);
26 }
27
28 // static
RecordApplicationLanguage(const std::string & application_locale)29 void LanguageUsageMetrics::RecordApplicationLanguage(
30 const std::string& application_locale) {
31 const int language_code = ToLanguageCode(application_locale);
32 if (language_code != 0)
33 UMA_HISTOGRAM_SPARSE_SLOWLY("LanguageUsage.ApplicationLanguage",
34 language_code);
35 }
36
37 // static
ToLanguageCode(const std::string & locale)38 int LanguageUsageMetrics::ToLanguageCode(const std::string& locale) {
39 base::StringTokenizer parts(locale, "-_");
40 if (!parts.GetNext())
41 return 0;
42
43 std::string language_part = parts.token();
44 StringToLowerASCII(&language_part);
45
46 int language_code = 0;
47 for (std::string::iterator it = language_part.begin();
48 it != language_part.end(); ++it) {
49 char ch = *it;
50 if (ch < 'a' || 'z' < ch)
51 return 0;
52
53 language_code <<= 8;
54 language_code += ch;
55 }
56
57 return language_code;
58 }
59
60 // static
ParseAcceptLanguages(const std::string & accept_languages,std::set<int> * languages)61 void LanguageUsageMetrics::ParseAcceptLanguages(
62 const std::string& accept_languages,
63 std::set<int>* languages) {
64 languages->clear();
65 base::StringTokenizer locales(accept_languages, ",");
66 while (locales.GetNext()) {
67 const int language_code = ToLanguageCode(locales.token());
68 if (language_code != 0)
69 languages->insert(language_code);
70 }
71 }
72