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 { 14 void RecordAcceptLanguage(int language_code) { 15 UMA_HISTOGRAM_SPARSE_SLOWLY("LanguageUsage.AcceptLanguage", 16 language_code); 17 } 18 } // namespace 19 20 // static 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 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 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 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
