1 // Copyright 2014 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 "components/language_usage_metrics/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 namespace language_usage_metrics {
21
22 // static
RecordAcceptLanguages(const std::string & accept_languages)23 void LanguageUsageMetrics::RecordAcceptLanguages(
24 const std::string& accept_languages) {
25 std::set<int> languages;
26 ParseAcceptLanguages(accept_languages, &languages);
27 std::for_each(languages.begin(), languages.end(), RecordAcceptLanguage);
28 }
29
30 // static
RecordApplicationLanguage(const std::string & application_locale)31 void LanguageUsageMetrics::RecordApplicationLanguage(
32 const std::string& application_locale) {
33 const int language_code = ToLanguageCode(application_locale);
34 if (language_code != 0)
35 UMA_HISTOGRAM_SPARSE_SLOWLY("LanguageUsage.ApplicationLanguage",
36 language_code);
37 }
38
39 // static
ToLanguageCode(const std::string & locale)40 int LanguageUsageMetrics::ToLanguageCode(const std::string& locale) {
41 base::StringTokenizer parts(locale, "-_");
42 if (!parts.GetNext())
43 return 0;
44
45 std::string language_part = parts.token();
46 StringToLowerASCII(&language_part);
47
48 int language_code = 0;
49 for (std::string::iterator it = language_part.begin();
50 it != language_part.end(); ++it) {
51 char ch = *it;
52 if (ch < 'a' || 'z' < ch)
53 return 0;
54
55 language_code <<= 8;
56 language_code += ch;
57 }
58
59 return language_code;
60 }
61
62 // static
ParseAcceptLanguages(const std::string & accept_languages,std::set<int> * languages)63 void LanguageUsageMetrics::ParseAcceptLanguages(
64 const std::string& accept_languages,
65 std::set<int>* languages) {
66 languages->clear();
67 base::StringTokenizer locales(accept_languages, ",");
68 while (locales.GetNext()) {
69 const int language_code = ToLanguageCode(locales.token());
70 if (language_code != 0)
71 languages->insert(language_code);
72 }
73 }
74
75 } // namespace language_usage_metrics
76