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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_LANGUAGE_USAGE_METRICS_H_
#define CHROME_BROWSER_LANGUAGE_USAGE_METRICS_H_
#pragma once
#include <set>
#include <string>
#include "base/gtest_prod_util.h"
#include "third_party/cld/languages/public/languages.h"
// Methods to record language usage as UMA histograms.
// Language codes are defined in third_party/cld/languages/proto/languages.pb.h
class LanguageUsageMetrics {
public:
// Records accept languages as a UMA histogram. |accept_languages| is a
// case-insensitive comma-separated list of languages/locales of either xx,
// xx-YY, or xx_YY format where xx is iso-639 language code and YY is iso-3166
// country code. Country code is ignored. That is, xx and XX-YY are considered
// identical and recorded once.
static void RecordAcceptLanguages(const std::string& accept_languages);
// Records the application language as a UMA histogram. |application_locale|
// is a case-insensitive locale string of either xx, xx-YY, or xx_YY format.
// Only the language part (xx in the example) is considered.
static void RecordApplicationLanguage(const std::string& application_locale);
private:
// This class must not be instantiated.
LanguageUsageMetrics();
// Parses |accept_languages| and returns a set of language codes in
// |languages|.
static void ParseAcceptLanguages(const std::string& accept_languages,
std::set<Language>* languages);
// Parses |locale| and returns the language code. Returns UNKNOWN_LANGUAGE in
// case of errors.
static Language ToLanguage(const std::string& locale);
FRIEND_TEST_ALL_PREFIXES(LanguageUsageMetricsTest, ParseAcceptLanguages);
FRIEND_TEST_ALL_PREFIXES(LanguageUsageMetricsTest, ToLanguage);
};
#endif // CHROME_BROWSER_LANGUAGE_USAGE_METRICS_H_
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