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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 #ifndef CHROME_BROWSER_LANGUAGE_USAGE_METRICS_H_ | |
6 #define CHROME_BROWSER_LANGUAGE_USAGE_METRICS_H_ | |
7 | |
8 #include <set> | |
9 #include <string> | |
10 | |
11 #include "base/basictypes.h" | |
12 #include "base/gtest_prod_util.h" | |
13 | |
14 // Methods to record language usage as UMA histograms. | |
15 class LanguageUsageMetrics { | |
16 public: | |
17 // Records accept languages as a UMA histogram. |accept_languages| is a | |
18 // case-insensitive comma-separated list of languages/locales of either xx, | |
19 // xx-YY, or xx_YY format where xx is iso-639 language code and YY is iso-3166 | |
20 // country code. Country code is ignored. That is, xx and XX-YY are considered | |
21 // identical and recorded once. | |
22 static void RecordAcceptLanguages(const std::string& accept_languages); | |
23 | |
24 // Records the application language as a UMA histogram. |application_locale| | |
25 // is a case-insensitive locale string of either xx, xx-YY, or xx_YY format. | |
26 // Only the language part (xx in the example) is considered. | |
27 static void RecordApplicationLanguage(const std::string& application_locale); | |
28 | |
29 // Parses |locale| and returns the language code. Returns 0 in case of errors. | |
30 // The language code is calculated from two alphabets. For example, if | |
31 // |locale| is 'en' which represents 'English', the codes of 'e' and 'n' are | |
32 // 101 and 110 respectively, and the language code will be 101 * 256 + 100 = | |
33 // 25966. | |
34 // |locale| should consist of only lower-case letters. This function doesn't | |
35 // check whether |locale| is valid locale or not strictly. | |
36 static int ToLanguageCode(const std::string &locale); | |
37 | |
38 private: | |
39 DISALLOW_IMPLICIT_CONSTRUCTORS(LanguageUsageMetrics); | |
40 | |
41 // Parses |accept_languages| and returns a set of language codes in | |
42 // |languages|. | |
43 static void ParseAcceptLanguages(const std::string& accept_languages, | |
44 std::set<int>* languages); | |
45 | |
46 FRIEND_TEST_ALL_PREFIXES(LanguageUsageMetricsTest, ParseAcceptLanguages); | |
47 }; | |
48 | |
49 #endif // CHROME_BROWSER_LANGUAGE_USAGE_METRICS_H_ | |
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