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1 // Copyright (c) 2016 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 "net/http/http_util_icu.h" | |
6 | |
7 #include <algorithm> | |
8 #include <set> | |
9 #include <string> | |
10 #include <vector> | |
11 | |
12 #include "base/logging.h" | |
13 #include "base/strings/string_split.h" | |
14 #include "base/strings/stringprintf.h" | |
15 #include "third_party/icu/source/common/unicode/uloc.h" | |
16 | |
17 namespace net { | |
18 namespace http_util_icu { | |
Ryan Sleevi
2016/12/15 23:44:07
line break between 17/18 and 18/19
Yirui Huang
2016/12/16 08:00:08
Done.
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19 // The input is a comma separated languages list, this function allows | |
20 // whitespace between each languages. It will come from the preference and a | |
21 // user does not manually edit the preference file. The accept languages that | |
22 // customized in Android Webview from developers are not processed here. | |
23 std::string GenerateAcceptLanguageHeader(const std::string& raw_language_list) { | |
24 std::vector<std::string> locales_list = base::SplitString( | |
25 raw_language_list, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY); | |
Ryan Sleevi
2016/12/15 23:44:07
The previous design was optimized to avoid needing
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26 | |
27 // If language is not in the accept languages list, also add language | |
28 // code. A language code should only be inserted after the last | |
29 // languageTag that contains that language. | |
30 std::set<std::string> seen_languages; | |
Ryan Sleevi
2016/12/15 23:44:07
This makes a full copy, and the std::set itself is
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31 std::vector<std::string> output_list; | |
32 for (auto it = locales_list.rbegin(); it != locales_list.rend(); ++it) { | |
Ryan Sleevi
2016/12/15 23:44:07
This forces a non-const reference, because the aut
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33 char locale_ID[ULOC_FULLNAME_CAPACITY] = {}; | |
34 char language_code[ULOC_LANG_CAPACITY] = {}; | |
35 | |
36 UErrorCode error = U_ZERO_ERROR; | |
37 std::string locale_string = *it; | |
38 uloc_forLanguageTag(locale_string.c_str(), locale_ID, | |
39 ULOC_FULLNAME_CAPACITY, nullptr, &error); | |
40 if (U_FAILURE(error)) { | |
41 LOG(ERROR) << "Ignoring invalid locale representation " << locale_string; | |
42 continue; | |
43 } | |
44 | |
45 error = U_ZERO_ERROR; | |
46 uloc_getLanguage(locale_ID, language_code, ULOC_LANG_CAPACITY, &error); | |
47 if (U_FAILURE(error)) { | |
48 LOG(ERROR) << "Ignoring invalid locale representation " << locale_string; | |
49 continue; | |
50 } | |
51 | |
52 if (seen_languages.find(language_code) == seen_languages.end()) { | |
53 output_list.push_back(language_code); | |
54 seen_languages.insert(language_code); | |
55 } | |
56 | |
57 if (language_code != *it) | |
58 output_list.push_back(locale_string); | |
59 } | |
60 | |
61 std::reverse(output_list.begin(), output_list.end()); | |
Ryan Sleevi
2016/12/15 23:44:07
This is not at all obvious why you reverse here.
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62 | |
63 // We use integers for q-value and q-value decrement that are 10 times larger | |
64 // than actual values to avoid a problem with comparing two floating point | |
65 // numbers. | |
66 const unsigned int kQvalueDecrement10 = 2; | |
67 unsigned int qvalue10 = 10; | |
68 std::string lang_list_with_q; | |
69 for (unsigned i = 0; i < output_list.size(); i++) { | |
70 if (qvalue10 == 10) { | |
71 // q=1.0 is implicit. | |
72 lang_list_with_q = output_list[i]; | |
73 } else { | |
74 DCHECK_LT(qvalue10, 10U); | |
75 base::StringAppendF(&lang_list_with_q, ",%s;q=0.%d", | |
76 output_list[i].c_str(), qvalue10); | |
77 } | |
78 // It does not make sense to have 'q=0'. | |
79 if (qvalue10 > kQvalueDecrement10) | |
80 qvalue10 -= kQvalueDecrement10; | |
81 } | |
82 return lang_list_with_q; | |
83 } | |
Ryan Sleevi
2016/12/15 23:44:07
linebreak between 83/84
Yirui Huang
2016/12/16 08:00:08
Done.
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84 } | |
Ryan Sleevi
2016/12/15 23:44:07
// namespace http_util_icu
Yirui Huang
2016/12/16 08:00:08
Done.
| |
85 } | |
Ryan Sleevi
2016/12/15 23:44:07
// namespace net
Yirui Huang
2016/12/16 08:00:08
Done.
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