ui/base/l10n/l10n_util.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.

// This file contains utility functions for dealing with localized
// content.

#ifndef UI_BASE_L10N_L10N_UTIL_H_
#define UI_BASE_L10N_L10N_UTIL_H_

#include <stddef.h>
#include <stdint.h>

#include <string>
#include <vector>

#include "base/component_export.h"
#include "base/strings/string16.h"
#include "build/build_config.h"

#if defined(OS_APPLE)
#include "ui/base/l10n/l10n_util_mac.h"
#endif  // OS_APPLE

namespace l10n_util {

// Takes normalized locale as |locale|. Returns language part (before '-').
COMPONENT_EXPORT(UI_BASE) std::string GetLanguage(const std::string& locale);

// This method translates a generic locale name to one of the locally defined
// ones. This method returns true if it succeeds.
COMPONENT_EXPORT(UI_BASE)
bool CheckAndResolveLocale(const std::string& locale,
                           std::string* resolved_locale);

// This method is responsible for determining the locale as defined below. In
// nearly all cases you shouldn't call this, rather use GetApplicationLocale
// defined on browser_process.
//
// Returns the locale used by the Application.  First we use the value from the
// command line (--lang), second we try the value in the prefs file (passed in
// as |pref_locale|), finally, we fall back on the system locale. We only return
// a value if there's a corresponding resource DLL for the locale.  Otherwise,
// we fall back to en-us. |set_icu_locale| determines whether the resulting
// locale is set as the default ICU locale before returning it.
COMPONENT_EXPORT(UI_BASE)
std::string GetApplicationLocale(const std::string& pref_locale,
                                 bool set_icu_locale);

// Convenience version of GetApplicationLocale() that sets the resulting locale
// as the default ICU locale before returning it.
COMPONENT_EXPORT(UI_BASE)
std::string GetApplicationLocale(const std::string& pref_locale);

// Returns true if a display name for |locale| is available in the locale
// |display_locale|.
COMPONENT_EXPORT(UI_BASE)
bool IsLocaleNameTranslated(const char* locale,
                            const std::string& display_locale);

// This method returns the display name of the locale code in |display_locale|.

// For example, for |locale| = "fr" and |display_locale| = "en",
// it returns "French". To get the display name of
// |locale| in the UI language of Chrome, |display_locale| can be
// set to the return value of g_browser_process->GetApplicationLocale()
// in the UI thread.
// If |is_for_ui| is true, U+200F is appended so that it can be
// rendered properly in a RTL Chrome.
COMPONENT_EXPORT(UI_BASE)
base::string16 GetDisplayNameForLocale(const std::string& locale,
                                       const std::string& display_locale,
                                       bool is_for_ui,
                                       bool disallow_default = false);

// Returns the display name of the |country_code| in |display_locale|.
COMPONENT_EXPORT(UI_BASE)
base::string16 GetDisplayNameForCountry(const std::string& country_code,
                                        const std::string& display_locale);

// Converts all - into _, to be consistent with ICU and file system names.
COMPONENT_EXPORT(UI_BASE)
std::string NormalizeLocale(const std::string& locale);

// Produce a vector of parent locales for given locale.
// It includes the current locale in the result.
// sr_Cyrl_RS generates sr_Cyrl_RS, sr_Cyrl and sr.
COMPONENT_EXPORT(UI_BASE)
void GetParentLocales(const std::string& current_locale,
                      std::vector<std::string>* parent_locales);

// Checks if a string is plausibly a syntactically-valid locale string,
// for cases where we want the valid input to be a locale string such as
// 'en', 'pt-BR', 'fil', 'es-419', 'zh-Hans-CN', 'i-klingon' or
// 'de_DE@collation=phonebook', but we don't want to limit it to
// locales that Chrome actually knows about, so 'xx-YY' should be
// accepted, but 'z', 'German', 'en-$1', or 'abcd-1234' should not.
// Case-insensitive. Based on BCP 47, see:
//   http://unicode.org/reports/tr35/#Unicode_Language_and_Locale_Identifiers
COMPONENT_EXPORT(UI_BASE) bool IsValidLocaleSyntax(const std::string& locale);

//
// Mac Note: See l10n_util_mac.h for some NSString versions and other support.
//

// Pulls resource string from the string bundle and returns it.
COMPONENT_EXPORT(UI_BASE) std::string GetStringUTF8(int message_id);
COMPONENT_EXPORT(UI_BASE) base::string16 GetStringUTF16(int message_id);

// Get a resource string and replace $i with replacements[i] for all
// i < replacements.size(). Additionally, $$ is replaced by $.
// If non-NULL |offsets| will be replaced with the start points of the replaced
// strings.
COMPONENT_EXPORT(UI_BASE)
base::string16 GetStringFUTF16(int message_id,
                               const std::vector<base::string16>& replacements,
                               std::vector<size_t>* offsets);

// Convenience wrappers for the above.
COMPONENT_EXPORT(UI_BASE)
base::string16 GetStringFUTF16(int message_id, const base::string16& a);
COMPONENT_EXPORT(UI_BASE)
base::string16 GetStringFUTF16(int message_id,
                               const base::string16& a,
                               const base::string16& b);
COMPONENT_EXPORT(UI_BASE)
base::string16 GetStringFUTF16(int message_id,
                               const base::string16& a,
                               const base::string16& b,
                               const base::string16& c);
COMPONENT_EXPORT(UI_BASE)
base::string16 GetStringFUTF16(int message_id,
                               const base::string16& a,
                               const base::string16& b,
                               const base::string16& c,
                               const base::string16& d);
COMPONENT_EXPORT(UI_BASE)
base::string16 GetStringFUTF16(int message_id,
                               const base::string16& a,
                               const base::string16& b,
                               const base::string16& c,
                               const base::string16& d,
                               const base::string16& e);
COMPONENT_EXPORT(UI_BASE)
std::string GetStringFUTF8(int message_id, const base::string16& a);
COMPONENT_EXPORT(UI_BASE)
std::string GetStringFUTF8(int message_id,
                           const base::string16& a,
                           const base::string16& b);
COMPONENT_EXPORT(UI_BASE)
std::string GetStringFUTF8(int message_id,
                           const base::string16& a,
                           const base::string16& b,
                           const base::string16& c);
COMPONENT_EXPORT(UI_BASE)
std::string GetStringFUTF8(int message_id,
                           const base::string16& a,
                           const base::string16& b,
                           const base::string16& c,
                           const base::string16& d);

// Variants that return the offset(s) of the replaced parameters. The
// vector based version returns offsets ordered by parameter. For example if
// invoked with a and b offsets[0] gives the offset for a and offsets[1] the
// offset of b regardless of where the parameters end up in the string.
COMPONENT_EXPORT(UI_BASE)
base::string16 GetStringFUTF16(int message_id,
                               const base::string16& a,
                               size_t* offset);
COMPONENT_EXPORT(UI_BASE)
base::string16 GetStringFUTF16(int message_id,
                               const base::string16& a,
                               const base::string16& b,
                               std::vector<size_t>* offsets);

// Convenience functions to get a string with a single integer as a parameter.
// The result will use non-ASCII(native) digits if required by a locale
// convention (e.g. Persian, Bengali).
// If a message requires plural formatting (e.g. "3 tabs open"), use
// GetPluralStringF*, instead. To format a double, integer or percentage alone
// without any surrounding text (e.g. "3.57", "123", "45%"), use
// base::Format{Double,Number,Percent}. With more than two numbers or
// number + surrounding text, use base::i18n::MessageFormatter.
// // Note that native digits have to be used in UI in general.
// base::{Int*,Double}ToString convert a number to a string with
// ASCII digits in non-UI strings.
COMPONENT_EXPORT(UI_BASE)
base::string16 GetStringFUTF16Int(int message_id, int a);
base::string16 GetStringFUTF16Int(int message_id, int64_t a);

// Convenience functions to format a string with a single number that requires
// plural formatting. Note that a simple 2-way rule (singular vs plural)
// breaks down for a number of languages. Instead of two separate messages
// for singular and plural, use this method with one message in ICU syntax.
// See http://userguide.icu-project.org/formatparse/messages and
// go/plurals (Google internal) for more details and examples.
//
// For complex messages with input parameters of multiple types (int,
// double, time, string; e.g. "At 3:45 on Feb 3, 2016, 5 files are downloaded
// at 3 MB/s."), use base::i18n::MessageFormatter.
// message_format_unittests.cc also has more examples of plural formatting.
COMPONENT_EXPORT(UI_BASE)
base::string16 GetPluralStringFUTF16(int message_id, int number);
COMPONENT_EXPORT(UI_BASE)
std::string GetPluralStringFUTF8(int message_id, int number);

// Get a string when you only care about 'single vs multiple' distinction.
// The message pointed to by |message_id| should be in ICU syntax
// (see the references above for Plural) with 'single', 'multiple', and
// 'other' (fallback) instead of 'male', 'female', and 'other' (fallback).
COMPONENT_EXPORT(UI_BASE)
base::string16 GetSingleOrMultipleStringUTF16(int message_id, bool is_multiple);

// In place sorting of base::string16 strings using collation rules for
// |locale|.
COMPONENT_EXPORT(UI_BASE)
void SortStrings16(const std::string& locale,
                   std::vector<base::string16>* strings);

// Returns a vector of available locale codes. E.g., a vector containing
// en-US, es, fr, fi, pt-PT, pt-BR, etc.
COMPONENT_EXPORT(UI_BASE) const std::vector<std::string>& GetAvailableLocales();

// Returns a vector of locale codes usable for accept-languages.
COMPONENT_EXPORT(UI_BASE)
void GetAcceptLanguagesForLocale(const std::string& display_locale,
                                 std::vector<std::string>* locale_codes);

// Returns a vector of untranslated locale codes usable for accept-languages.
COMPONENT_EXPORT(UI_BASE)
void GetAcceptLanguages(std::vector<std::string>* locale_codes);

// Returns true if |locale| is in a predefined AcceptLanguageList and
// a display name for the |locale| is available in the locale |display_locale|.
COMPONENT_EXPORT(UI_BASE)
bool IsLanguageAccepted(const std::string& display_locale,
                        const std::string& locale);

// Returns the preferred size of the contents view of a window based on
// designer given constraints which might dependent on the language used.
COMPONENT_EXPORT(UI_BASE)
int GetLocalizedContentsWidthInPixels(int pixel_resource_id);

COMPONENT_EXPORT(UI_BASE) const char* const* GetAcceptLanguageListForTesting();

COMPONENT_EXPORT(UI_BASE) size_t GetAcceptLanguageListSizeForTesting();

}  // namespace l10n_util

#endif  // UI_BASE_L10N_L10N_UTIL_H_