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// 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/browser/chromeos/system/timezone_util.h"
#include <string>
#include "base/i18n/rtl.h"
#include "base/lazy_instance.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/synchronization/lock.h"
#include "base/values.h"
#include "chrome/grit/generated_resources.h"
#include "chromeos/settings/timezone_settings.h"
#include "third_party/icu/source/common/unicode/ures.h"
#include "third_party/icu/source/common/unicode/utypes.h"
#include "third_party/icu/source/i18n/unicode/calendar.h"
#include "third_party/icu/source/i18n/unicode/timezone.h"
#include "ui/base/l10n/l10n_util.h"
namespace {
struct UResClose {
inline void operator() (UResourceBundle* b) const {
ures_close(b);
}
};
static base::LazyInstance<base::Lock>::Leaky
g_timezone_bundle_lock = LAZY_INSTANCE_INITIALIZER;
// Returns an exemplary city in the given timezone.
base::string16 GetExemplarCity(const icu::TimeZone& zone) {
// TODO(jungshik): After upgrading to ICU 4.6, use U_ICUDATA_ZONE
static const char* zone_bundle_name = NULL;
// These will be leaked at the end.
static UResourceBundle *zone_bundle = NULL;
static UResourceBundle *zone_strings = NULL;
UErrorCode status = U_ZERO_ERROR;
{
base::AutoLock lock(g_timezone_bundle_lock.Get());
if (zone_bundle == NULL)
zone_bundle = ures_open(zone_bundle_name, uloc_getDefault(), &status);
if (zone_strings == NULL)
zone_strings = ures_getByKey(zone_bundle, "zone_strings", NULL, &status);
}
icu::UnicodeString zone_id;
zone.getID(zone_id);
std::string zone_id_str;
zone_id.toUTF8String(zone_id_str);
// Resource keys for timezones use ':' in place of '/'.
ReplaceSubstringsAfterOffset(&zone_id_str, 0, "/", ":");
scoped_ptr<UResourceBundle, UResClose> zone_item(
ures_getByKey(zone_strings, zone_id_str.c_str(), NULL, &status));
icu::UnicodeString city;
if (!U_FAILURE(status)) {
city = icu::ures_getUnicodeStringByKey(zone_item.get(), "ec", &status);
if (U_SUCCESS(status))
return base::string16(city.getBuffer(), city.length());
}
// Fallback case in case of failure.
ReplaceSubstringsAfterOffset(&zone_id_str, 0, ":", "/");
// Take the last component of a timezone id (e.g. 'Baz' in 'Foo/Bar/Baz').
// Depending on timezones, keeping all but the 1st component
// (e.g. Bar/Baz) may be better, but our current list does not have
// any timezone for which that's the case.
std::string::size_type slash_pos = zone_id_str.rfind('/');
if (slash_pos != std::string::npos && slash_pos < zone_id_str.size())
zone_id_str.erase(0, slash_pos + 1);
// zone id has '_' in place of ' '.
ReplaceSubstringsAfterOffset(&zone_id_str, 0, "_", " ");
return base::ASCIIToUTF16(zone_id_str);
}
// Gets the given timezone's name for visualization.
base::string16 GetTimezoneName(const icu::TimeZone& timezone) {
// Instead of using the raw_offset, use the offset in effect now.
// For instance, US Pacific Time, the offset shown will be -7 in summer
// while it'll be -8 in winter.
int raw_offset, dst_offset;
UDate now = icu::Calendar::getNow();
UErrorCode status = U_ZERO_ERROR;
timezone.getOffset(now, false, raw_offset, dst_offset, status);
DCHECK(U_SUCCESS(status));
int offset = raw_offset + dst_offset;
// |offset| is in msec.
int minute_offset = std::abs(offset) / 60000;
int hour_offset = minute_offset / 60;
int min_remainder = minute_offset % 60;
// Some timezones have a non-integral hour offset. So, we need to use hh:mm
// form.
std::string offset_str = base::StringPrintf(offset >= 0 ?
"UTC+%d:%02d" : "UTC-%d:%02d", hour_offset, min_remainder);
// TODO(jungshik): When coming up with a better list of timezones, we also
// have to come up with better 'display' names. One possibility is to list
// multiple cities (e.g. "Los Angeles, Vancouver .." in the order of
// the population of a country the city belongs to.).
// We can also think of using LONG_GENERIC or LOCATION once we upgrade
// to ICU 4.6.
// In the meantime, we use "LONG" name with "Exemplar City" to distinguish
// multiple timezones with the same "LONG" name but with different
// rules (e.g. US Mountain Time in Denver vs Phoenix).
icu::UnicodeString name;
timezone.getDisplayName(dst_offset != 0, icu::TimeZone::LONG, name);
base::string16 result(l10n_util::GetStringFUTF16(
IDS_OPTIONS_SETTINGS_TIMEZONE_DISPLAY_TEMPLATE,
base::ASCIIToUTF16(offset_str),
base::string16(name.getBuffer(), name.length()),
GetExemplarCity(timezone)));
base::i18n::AdjustStringForLocaleDirection(&result);
return result;
}
} // namespace
namespace chromeos {
namespace system {
// Creates a list of pairs of each timezone's ID and name.
scoped_ptr<base::ListValue> GetTimezoneList() {
const std::vector<icu::TimeZone*> &timezones =
chromeos::system::TimezoneSettings::GetInstance()->GetTimezoneList();
scoped_ptr<base::ListValue> timezoneList(new base::ListValue());
for (std::vector<icu::TimeZone*>::const_iterator iter = timezones.begin();
iter != timezones.end(); ++iter) {
const icu::TimeZone* timezone = *iter;
base::ListValue* option = new base::ListValue();
option->Append(new base::StringValue(
chromeos::system::TimezoneSettings::GetTimezoneID(*timezone)));
option->Append(new base::StringValue(GetTimezoneName(*timezone)));
timezoneList->Append(option);
}
return timezoneList.Pass();
}
} // namespace system
} // namespace chromeos
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