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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_LANGUAGE_CORE_BROWSER_LANGUAGE_USAGE_METRICS_H_
#define COMPONENTS_LANGUAGE_CORE_BROWSER_LANGUAGE_USAGE_METRICS_H_
#include <string_view>
#include <vector>
#include "base/gtest_prod_util.h"
namespace language {
class UrlLanguageHistogram;
// Methods to record language usage as UMA histograms.
class LanguageUsageMetrics {
public:
LanguageUsageMetrics() = delete;
LanguageUsageMetrics(const LanguageUsageMetrics&) = delete;
LanguageUsageMetrics& operator=(const LanguageUsageMetrics&) = delete;
// 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(std::string_view accept_languages);
// Records detected page language history as a UMA histogram.
// |UrlLanguageHistogram| is a mapping of page language to frequency. Country
// codes are ignored for page language. Each language is counted once
// regardless of frequency. Languages with a frequency below 0.05 are ignored.
static void RecordPageLanguages(
const language::UrlLanguageHistogram& language_counts);
// Maps |locale| to a hash value in the "LanguageName" enum.
// Deprecated - please use the enum "LocaleCodeBCP47" which maps the full
// locale including country variant to a base::HashMetricName value.
//
// The language hash is calculated by splitting the locale on "-" and bit
// shifting the char int values. For example, if |locale| is 'en' the codes
// of 'e' and 'n' are 101 and 110 respectively, and the language hash will be
// 101 * 256 + 100 = 25966. |locale| is case-insensitive and not checked for
// validity. Returns 0 in case of errors.
static int ToLanguageCodeHash(std::string_view locale);
private:
// Return a list of unique language codes after parsing `accept_languages`.
static std::vector<int> ParseAcceptLanguages(
std::string_view accept_languages);
FRIEND_TEST_ALL_PREFIXES(LanguageUsageMetricsTest, ParseAcceptLanguages);
};
} // namespace language
#endif // COMPONENTS_LANGUAGE_CORE_BROWSER_LANGUAGE_USAGE_METRICS_H_
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