chrome/browser/language_usage_metrics.cc

   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/histogram.h"
  10 #include "base/string_tokenizer.h"
  11 #include "base/string_util.h"
  12
  13 namespace {
  14 void RecordAcceptLanguage(Language language) {
  15   UMA_HISTOGRAM_ENUMERATION("LanguageUsageMetrics.AcceptLanguage",
  16                             language, NUM_LANGUAGES);
  17 }
  18 }  // namespace
  19
  20 // static
  21 void LanguageUsageMetrics::RecordAcceptLanguages(
  22     const std::string& accept_languages) {
  23   // Rethink about the histogram memory costs when the number of languages
  24   // becomes too large.
  25   DCHECK_LE(NUM_LANGUAGES, 300);
  26
  27   std::set<Language> languages;
  28   ParseAcceptLanguages(accept_languages, &languages);
  29   std::for_each(languages.begin(), languages.end(), RecordAcceptLanguage);
  30 }
  31
  32 // static
  33 void LanguageUsageMetrics::RecordApplicationLanguage(
  34     const std::string& application_locale) {
  35   const Language language = ToLanguage(application_locale);
  36   if (language != UNKNOWN_LANGUAGE) {
  37     UMA_HISTOGRAM_ENUMERATION("LanguageUsageMetrics.ApplicationLanguage",
  38                               language, NUM_LANGUAGES);
  39   }
  40 }
  41
  42 // static
  43 void LanguageUsageMetrics::ParseAcceptLanguages(
  44     const std::string& accept_languages, std::set<Language>* languages) {
  45   languages->clear();
  46   StringTokenizer locales(accept_languages, ",");
  47   while (locales.GetNext()) {
  48     const Language language = ToLanguage(locales.token());
  49     if (language != UNKNOWN_LANGUAGE) {
  50       languages->insert(language);
  51     }
  52   }
  53 }
  54
  55 // static
  56 Language LanguageUsageMetrics::ToLanguage(const std::string& locale) {
  57   StringTokenizer parts(locale, "-_");
  58   if (!parts.GetNext()) {
  59     return UNKNOWN_LANGUAGE;
  60   }
  61   const std::string language_part = parts.token();
  62   Language language;
  63   if (!LanguageFromCode(language_part.c_str(), &language)) {
  64     return UNKNOWN_LANGUAGE;
  65   }
  66   return language;
  67 }