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// Copyright 2014 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 COMPONENTS_LANGUAGE_USAGE_METRICS_LANGUAGE_USAGE_METRICS_H_
#define COMPONENTS_LANGUAGE_USAGE_METRICS_LANGUAGE_USAGE_METRICS_H_
#include <set>
#include <string>
#include "base/gtest_prod_util.h"
#include "base/macros.h"
namespace language_usage_metrics {
// Methods to record language usage as UMA histograms.
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);
// Parses |locale| and returns the language code. Returns 0 in case of errors.
// The language code is calculated from two alphabets. For example, if
// |locale| is 'en' which represents 'English', the codes of 'e' and 'n' are
// 101 and 110 respectively, and the language code will be 101 * 256 + 100 =
// 25966.
// |locale| should consist of only lower-case letters. This function doesn't
// check whether |locale| is valid locale or not strictly.
static int ToLanguageCode(const std::string &locale);
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(LanguageUsageMetrics);
// Parses |accept_languages| and returns a set of language codes in
// |languages|.
static void ParseAcceptLanguages(const std::string& accept_languages,
std::set<int>* languages);
FRIEND_TEST_ALL_PREFIXES(LanguageUsageMetricsTest, ParseAcceptLanguages);
};
} // namespace language_usage_metrics
#endif // COMPONENTS_LANGUAGE_USAGE_METRICS_LANGUAGE_USAGE_METRICS_H_
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