[WIP][DO NOT LAND] Componentize spellcheck

chrome/common/spellcheck_common.cc

-// Copyright (c) 2012 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/spellcheck_common.h"
-
-#include "base/command_line.h"
-#include "base/files/file_path.h"
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/metrics/field_trial.h"
-#include "base/strings/string_util.h"
-#include "chrome/common/chrome_switches.h"
-#include "third_party/icu/source/common/unicode/uloc.h"
-#include "third_party/icu/source/common/unicode/urename.h"
-#include "third_party/icu/source/common/unicode/utypes.h"
-
-namespace chrome {
-namespace spellcheck_common {
-
-struct LanguageRegion {
-  const char* language;  // The language.
-  const char* language_region;  // language & region, used by dictionaries.
-};
-
-struct LanguageVersion {
-  const char* language;  // The language input.
-  const char* version;   // The corresponding version.
-};
-
-static const LanguageRegion g_supported_spellchecker_languages[] = {
-  // Several languages are not to be included in the spellchecker list:
-  // th-TH, vi-VI.
-  {"af", "af-ZA"},
-  {"bg", "bg-BG"},
-  {"ca", "ca-ES"},
-  {"cs", "cs-CZ"},
-  {"da", "da-DK"},
-  {"de", "de-DE"},
-  {"el", "el-GR"},
-  {"en-AU", "en-GB"},
-  {"en-CA", "en-CA"},
-  {"en-GB", "en-GB"},
-  {"en-US", "en-US"},
-  {"es", "es-ES"},
-  {"es-419", "es-ES"},
-  {"es-AR", "es-ES"},
-  {"es-ES", "es-ES"},
-  {"es-MX", "es-ES"},
-  {"es-US", "es-ES"},
-  {"et", "et-EE"},
-  {"fa", "fa-IR"},
-  {"fo", "fo-FO"},
-  {"fr", "fr-FR"},
-  {"he", "he-IL"},
-  {"hi", "hi-IN"},
-  {"hr", "hr-HR"},
-  {"hu", "hu-HU"},
-  {"id", "id-ID"},
-  {"it", "it-IT"},
-  {"ko", "ko"},
-  {"lt", "lt-LT"},
-  {"lv", "lv-LV"},
-  {"nb", "nb-NO"},
-  {"nl", "nl-NL"},
-  {"pl", "pl-PL"},
-  {"pt-BR", "pt-BR"},
-  {"pt-PT", "pt-PT"},
-  {"ro", "ro-RO"},
-  {"ru", "ru-RU"},
-  {"sh", "sh"},
-  {"sk", "sk-SK"},
-  {"sl", "sl-SI"},
-  {"sq", "sq"},
-  {"sr", "sr"},
-  {"sv", "sv-SE"},
-  {"ta", "ta-IN"},
-  {"tg", "tg-TG"},
-  {"tr", "tr-TR"},
-  {"uk", "uk-UA"},
-  {"vi", "vi-VN"},
-};
-
-bool IsValidRegion(const std::string& region) {
-  for (size_t i = 0; i < arraysize(g_supported_spellchecker_languages);
-       ++i) {
-    if (g_supported_spellchecker_languages[i].language_region == region)
-      return true;
-  }
-  return false;
-}
-
-// This function returns the language-region version of language name.
-// e.g. returns hi-IN for hi.
-std::string GetSpellCheckLanguageRegion(const std::string& input_language) {
-  for (size_t i = 0; i < arraysize(g_supported_spellchecker_languages);
-       ++i) {
-    if (g_supported_spellchecker_languages[i].language == input_language) {
-      return std::string(
-          g_supported_spellchecker_languages[i].language_region);
-    }
-  }
-
-  return input_language;
-}
-
-base::FilePath GetVersionedFileName(const std::string& input_language,
-                                    const base::FilePath& dict_dir) {
-  // The default dictionary version is 3-0. This version indicates that the bdic
-  // file contains a checksum.
-  static const char kDefaultVersionString[] = "-3-0";
-
-  // Add non-default version strings here. Use the same version for all the
-  // dictionaries that you add at the same time. Increment the major version
-  // number if you're updating either dic or aff files. Increment the minor
-  // version number if you're updating only dic_delta files.
-  static LanguageVersion special_version_string[] = {
-    {"tr-TR", "-4-0"},  // Jan 9, 2013: Add "FLAG num" to aff to avoid heapcheck
-                        // crash.
-    {"tg-TG", "-5-0"},  // Mar 4, 2014: Add Tajik dictionary.
-
-    // April 2016: Local fixes
-    {"en-CA", "-7-1"},
-    {"en-GB", "-7-1"},
-    {"en-US", "-7-1"},
-
-    // March 2016: Initial check-in of Persian
-    {"fa-IR", "-7-0"},
-  };
-
-  // Generate the bdict file name using default version string or special
-  // version string, depending on the language.
-  std::string language = GetSpellCheckLanguageRegion(input_language);
-  std::string versioned_bdict_file_name(language + kDefaultVersionString +
-                                        ".bdic");
-  for (size_t i = 0; i < arraysize(special_version_string); ++i) {
-    if (language == special_version_string[i].language) {
-      versioned_bdict_file_name =
-          language + special_version_string[i].version + ".bdic";
-      break;
-    }
-  }
-
-  return dict_dir.AppendASCII(versioned_bdict_file_name);
-}
-
-std::string GetCorrespondingSpellCheckLanguage(const std::string& language) {
-  std::string best_match;
-  // Look for exact match in the Spell Check language list.
-  for (size_t i = 0; i < arraysize(g_supported_spellchecker_languages);
-       ++i) {
-    // First look for exact match in the language region of the list.
-    std::string spellcheck_language(
-        g_supported_spellchecker_languages[i].language);
-    if (spellcheck_language == language)
-      return language;
-
-    // Next, look for exact match in the language_region part of the list.
-    std::string spellcheck_language_region(
-        g_supported_spellchecker_languages[i].language_region);
-    if (spellcheck_language_region == language) {
-      if (best_match.empty())
-        best_match = g_supported_spellchecker_languages[i].language;
-    }
-  }
-
-  // No match found - return best match, if any.
-  return best_match;
-}
-
-void SpellCheckLanguages(std::vector<std::string>* languages) {
-  for (size_t i = 0; i < arraysize(g_supported_spellchecker_languages);
-       ++i) {
-    languages->push_back(g_supported_spellchecker_languages[i].language);
-  }
-}
-
-void GetISOLanguageCountryCodeFromLocale(const std::string& locale,
-                                         std::string* language_code,
-                                         std::string* country_code) {
-  DCHECK(language_code);
-  DCHECK(country_code);
-  char language[ULOC_LANG_CAPACITY] = ULOC_ENGLISH;
-  const char* country = "USA";
-  if (!locale.empty()) {
-    UErrorCode error = U_ZERO_ERROR;
-    char id[ULOC_LANG_CAPACITY + ULOC_SCRIPT_CAPACITY + ULOC_COUNTRY_CAPACITY];
-    uloc_addLikelySubtags(locale.c_str(), id, arraysize(id), &error);
-    error = U_ZERO_ERROR;
-    uloc_getLanguage(id, language, arraysize(language), &error);
-    country = uloc_getISO3Country(id);
-  }
-  *language_code = std::string(language);
-  *country_code = std::string(country);
-}
-
-}  // namespace spellcheck_common
-}  // namespace chrome