Enables the user to select multiple languages for spellchecking (UI)

chrome/common/spellcheck_common.h

 // 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.
 
 #ifndef CHROME_COMMON_SPELLCHECK_COMMON_H_
 #define CHROME_COMMON_SPELLCHECK_COMMON_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 namespace base {
 class FilePath;
 }
 
+class PrefService;
+
 namespace chrome {
 namespace spellcheck_common {
 
 // The number of hours that a session of feedback for spelling service lasts.
 // After this number of hours passes, all feedback.
 static const int kSessionHours = 6;
 
 // The number of context words to keep on either side of a misspelling for
 // spelling service feedback.
 static const int kContextWordCount = 2;
 
 // The number of seconds between sending feedback to spelling service.
 static const int kFeedbackIntervalSeconds = 1800;  // 30 minutes
 
 // Max number of dictionary suggestions.
 static const int kMaxSuggestions = 5;
 
 static const int kMaxAutoCorrectWordSize = 8;
 
 // Maximum number of words in the custom spellcheck dictionary that can be
 // synced.
 static const size_t MAX_SYNCABLE_DICTIONARY_WORDS = 1300;
 
 // Maximum number of bytes in a word that can be added to the custom spellcheck
 // dictionary.
 static const size_t MAX_CUSTOM_DICTIONARY_WORD_BYTES = 99;
 
+// Character that separates language codes saved in preferences.
+static const char kDictionaryLanguagesSeparator = ',';
+
 typedef std::vector<std::string> WordList;
 typedef std::set<std::string> WordSet;
 
 base::FilePath GetVersionedFileName(const std::string& input_language,
                                     const base::FilePath& dict_dir);
 
 std::string GetCorrespondingSpellCheckLanguage(const std::string& language);
 
 // Get SpellChecker supported languages.
 void SpellCheckLanguages(std::vector<std::string>* languages);
 
 // Gets the ISO codes for the language and country of this |locale|. The
 // |locale| is an ISO locale ID that may not include a country ID, e.g., "fr" or
 // "de". This method converts the UI locale to a full locale ID and converts the
 // full locale ID to an ISO language code and an ISO3 country code.
 void GetISOLanguageCountryCodeFromLocale(const std::string& locale,
                                          std::string* language_code,
                                          std::string* country_code);
 
+// Reads the spellcheck.dictionary or spellcheck.dictionaries preference
+// (depending on whether the enable-multilingual-spellchecker flag is set), and
+// returns the language codes.
+std::vector<std::string> GetDictionaryLanguagesPref(PrefService* prefs);
+
 }  // namespace spellcheck_common
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_SPELLCHECK_COMMON_H_