Move language detection to a component

chrome/common/translate/translate_util.cc

-// Copyright 2013 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 "chrome/common/translate/translate_util.h"
-
-#include "base/basictypes.h"
-#include "base/command_line.h"
-#include "base/logging.h"
-#include "base/strings/string_split.h"
-#include "chrome/common/chrome_switches.h"
-#include "url/gurl.h"
-
-namespace {
-
-// Split the |language| into two parts. For example, if |language| is 'en-US',
-// this will be split into the main part 'en' and the tail part '-US'.
-void SplitIntoMainAndTail(const std::string& language,
-                          std::string* main_part,
-                          std::string* tail_part) {
-  DCHECK(main_part);
-  DCHECK(tail_part);
-
-  std::vector<std::string> chunks;
-  base::SplitString(language, '-', &chunks);
-  if (chunks.size() == 0u)
-    return;
-
-  *main_part = chunks[0];
-  *tail_part = language.substr(main_part->size());
-}
-
-}  // namespace
-
-namespace TranslateUtil {
-
-struct LanguageCodePair {
-  // Code used in supporting list of Translate.
-  const char* const translate_language;
-
-  // Code used in Chrome internal.
-  const char* const chrome_language;
-};
-
-// Some languages are treated as same languages in Translate even though they
-// are different to be exact.
-//
-// If this table is updated, please sync this with the synonym table in
-// chrome/browser/resources/options/language_options.js
-const LanguageCodePair kLanguageCodeSimilitudes[] = {
-  {"no", "nb"},
-  {"tl", "fil"},
-};
-
-// Some languages have changed codes over the years and sometimes the older
-// codes are used, so we must see them as synonyms.
-//
-// If this table is updated, please sync this with the synonym table in
-// chrome/browser/resources/options/language_options.js
-const LanguageCodePair kLanguageCodeSynonyms[] = {
-  {"iw", "he"},
-  {"jw", "jv"},
-};
-
-const char kSecurityOrigin[] = "https://translate.googleapis.com/";
-
-void ToTranslateLanguageSynonym(std::string* language) {
-  for (size_t i = 0; i < arraysize(kLanguageCodeSimilitudes); ++i) {
-    if (*language == kLanguageCodeSimilitudes[i].chrome_language) {
-      *language = kLanguageCodeSimilitudes[i].translate_language;
-      return;
-    }
-  }
-
-  std::string main_part, tail_part;
-  SplitIntoMainAndTail(*language, &main_part, &tail_part);
-  if (main_part.empty())
-    return;
-
-  // Apply liner search here because number of items in the list is just four.
-  for (size_t i = 0; i < arraysize(kLanguageCodeSynonyms); ++i) {
-    if (main_part == kLanguageCodeSynonyms[i].chrome_language) {
-      main_part = std::string(kLanguageCodeSynonyms[i].translate_language);
-      break;
-    }
-  }
-
-  *language = main_part + tail_part;
-}
-
-void ToChromeLanguageSynonym(std::string* language) {
-  for (size_t i = 0; i < arraysize(kLanguageCodeSimilitudes); ++i) {
-    if (*language == kLanguageCodeSimilitudes[i].translate_language) {
-      *language = kLanguageCodeSimilitudes[i].chrome_language;
-      return;
-    }
-  }
-
-  std::string main_part, tail_part;
-  SplitIntoMainAndTail(*language, &main_part, &tail_part);
-  if (main_part.empty())
-    return;
-
-  // Apply liner search here because number of items in the list is just four.
-  for (size_t i = 0; i < arraysize(kLanguageCodeSynonyms); ++i) {
-    if (main_part == kLanguageCodeSynonyms[i].translate_language) {
-      main_part = std::string(kLanguageCodeSynonyms[i].chrome_language);
-      break;
-    }
-  }
-
-  *language = main_part + tail_part;
-}
-
-GURL GetTranslateSecurityOrigin() {
-  std::string security_origin(kSecurityOrigin);
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
-  if (command_line->HasSwitch(switches::kTranslateSecurityOrigin)) {
-    security_origin =
-        command_line->GetSwitchValueASCII(switches::kTranslateSecurityOrigin);
-  }
-  return GURL(security_origin);
-}
-
-}  // namespace TranslateUtil