Index: net/http/http_util_icu.cc |
diff --git a/net/http/http_util_icu.cc b/net/http/http_util_icu.cc |
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+// Copyright (c) 2016 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. |
+ |
+#include "net/http/http_util_icu.h" |
+ |
+#include <algorithm> |
+#include <set> |
+#include <string> |
+#include <vector> |
+ |
+#include "base/logging.h" |
+#include "base/strings/string_split.h" |
+#include "base/strings/stringprintf.h" |
+#include "third_party/icu/source/common/unicode/uloc.h" |
+ |
+namespace net { |
+ |
+namespace http_util_icu { |
+ |
+// The input is a comma separated languages list, this function allows |
+// whitespace between each languages. It will come from the preference and a |
+// user does not manually edit the preference file. The accept languages that |
+// customized in Android Webview from developers are not processed here. |
+std::string GenerateAcceptLanguageHeader(const std::string& raw_language_list) { |
+ std::vector<std::string> locales_list = base::SplitString( |
+ raw_language_list, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY); |
+ |
+ // If language is not in the accept languages list, also add language |
+ // code. A language code should only be inserted after the last |
+ // languageTag that contains that language. |
+ std::set<std::string> seen_languages; |
+ std::vector<std::string> output_list; |
+ for (auto it = locales_list.rbegin(); it != locales_list.rend(); ++it) { |
+ char locale_ID[ULOC_FULLNAME_CAPACITY] = {}; |
+ char language_code[ULOC_LANG_CAPACITY] = {}; |
+ |
+ UErrorCode error = U_ZERO_ERROR; |
+ std::string locale_string = *it; |
+ uloc_forLanguageTag(locale_string.c_str(), locale_ID, |
+ ULOC_FULLNAME_CAPACITY, nullptr, &error); |
+ if (U_FAILURE(error)) { |
+ LOG(ERROR) << "Ignoring invalid locale representation " << locale_string; |
+ continue; |
+ } |
+ |
+ error = U_ZERO_ERROR; |
+ uloc_getLanguage(locale_ID, language_code, ULOC_LANG_CAPACITY, &error); |
+ if (U_FAILURE(error)) { |
+ LOG(ERROR) << "Ignoring invalid locale representation " << locale_string; |
+ continue; |
+ } |
+ |
+ if (seen_languages.find(language_code) == seen_languages.end()) { |
+ output_list.push_back(language_code); |
+ seen_languages.insert(language_code); |
+ } |
+ |
+ if (language_code != *it) |
+ output_list.push_back(locale_string); |
+ } |
+ |
+ std::reverse(output_list.begin(), output_list.end()); |
+ |
+ // We use integers for q-value and q-value decrement that are 10 times larger |
+ // than actual values to avoid a problem with comparing two floating point |
+ // numbers. |
+ const unsigned int kQvalueDecrement10 = 2; |
+ unsigned int qvalue10 = 10; |
+ std::string lang_list_with_q; |
+ for (unsigned i = 0; i < output_list.size(); i++) { |
+ if (qvalue10 == 10) { |
+ // q=1.0 is implicit. |
+ lang_list_with_q = output_list[i]; |
+ } else { |
+ DCHECK_LT(qvalue10, 10U); |
+ base::StringAppendF(&lang_list_with_q, ",%s;q=0.%d", |
+ output_list[i].c_str(), qvalue10); |
+ } |
+ // It does not make sense to have 'q=0'. |
+ if (qvalue10 > kQvalueDecrement10) |
+ qvalue10 -= kQvalueDecrement10; |
+ } |
+ return lang_list_with_q; |
+} |
+ |
+} // namespace http_util_icu |
+ |
+} // namespace net |