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// Copyright (c) 2011 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 "base/i18n/time_formatting.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/utf_string_conversions.h"
#include "base/time/time.h"
#include "third_party/icu/source/i18n/unicode/datefmt.h"
#include "third_party/icu/source/i18n/unicode/dtptngen.h"
#include "third_party/icu/source/i18n/unicode/smpdtfmt.h"
namespace base {
namespace {
string16 TimeFormat(const icu::DateFormat* formatter,
const Time& time) {
DCHECK(formatter);
icu::UnicodeString date_string;
formatter->format(static_cast<UDate>(time.ToDoubleT() * 1000), date_string);
return string16(date_string.getBuffer(),
static_cast<size_t>(date_string.length()));
}
string16 TimeFormatWithoutAmPm(const icu::DateFormat* formatter,
const Time& time) {
DCHECK(formatter);
icu::UnicodeString time_string;
icu::FieldPosition ampm_field(icu::DateFormat::kAmPmField);
formatter->format(
static_cast<UDate>(time.ToDoubleT() * 1000), time_string, ampm_field);
int ampm_length = ampm_field.getEndIndex() - ampm_field.getBeginIndex();
if (ampm_length) {
int begin = ampm_field.getBeginIndex();
// Doesn't include any spacing before the field.
if (begin)
begin--;
time_string.removeBetween(begin, ampm_field.getEndIndex());
}
return string16(time_string.getBuffer(),
static_cast<size_t>(time_string.length()));
}
} // namespace
string16 TimeFormatTimeOfDay(const Time& time) {
// We can omit the locale parameter because the default should match
// Chrome's application locale.
scoped_ptr<icu::DateFormat> formatter(
icu::DateFormat::createTimeInstance(icu::DateFormat::kShort));
return TimeFormat(formatter.get(), time);
}
string16 TimeFormatTimeOfDayWithHourClockType(const Time& time,
HourClockType type,
AmPmClockType ampm) {
// Just redirect to the normal function if the default type matches the
// given type.
HourClockType default_type = GetHourClockType();
if (default_type == type && (type == k24HourClock || ampm == kKeepAmPm)) {
return TimeFormatTimeOfDay(time);
}
// Generate a locale-dependent format pattern. The generator will take
// care of locale-dependent formatting issues like which separator to
// use (some locales use '.' instead of ':'), and where to put the am/pm
// marker.
UErrorCode status = U_ZERO_ERROR;
scoped_ptr<icu::DateTimePatternGenerator> generator(
icu::DateTimePatternGenerator::createInstance(status));
DCHECK(U_SUCCESS(status));
const char* base_pattern = (type == k12HourClock ? "ahm" : "Hm");
icu::UnicodeString generated_pattern =
generator->getBestPattern(icu::UnicodeString(base_pattern), status);
DCHECK(U_SUCCESS(status));
// Then, format the time using the generated pattern.
icu::SimpleDateFormat formatter(generated_pattern, status);
DCHECK(U_SUCCESS(status));
if (ampm == kKeepAmPm) {
return TimeFormat(&formatter, time);
} else {
return TimeFormatWithoutAmPm(&formatter, time);
}
}
string16 TimeFormatShortDate(const Time& time) {
scoped_ptr<icu::DateFormat> formatter(
icu::DateFormat::createDateInstance(icu::DateFormat::kMedium));
return TimeFormat(formatter.get(), time);
}
string16 TimeFormatShortDateNumeric(const Time& time) {
scoped_ptr<icu::DateFormat> formatter(
icu::DateFormat::createDateInstance(icu::DateFormat::kShort));
return TimeFormat(formatter.get(), time);
}
string16 TimeFormatShortDateAndTime(const Time& time) {
scoped_ptr<icu::DateFormat> formatter(
icu::DateFormat::createDateTimeInstance(icu::DateFormat::kShort));
return TimeFormat(formatter.get(), time);
}
string16 TimeFormatShortDateAndTimeWithTimeZone(const Time& time) {
scoped_ptr<icu::DateFormat> formatter(icu::DateFormat::createDateTimeInstance(
icu::DateFormat::kShort, icu::DateFormat::kLong));
return TimeFormat(formatter.get(), time);
}
string16 TimeFormatFriendlyDateAndTime(const Time& time) {
scoped_ptr<icu::DateFormat> formatter(
icu::DateFormat::createDateTimeInstance(icu::DateFormat::kFull));
return TimeFormat(formatter.get(), time);
}
string16 TimeFormatFriendlyDate(const Time& time) {
scoped_ptr<icu::DateFormat> formatter(icu::DateFormat::createDateInstance(
icu::DateFormat::kFull));
return TimeFormat(formatter.get(), time);
}
HourClockType GetHourClockType() {
// TODO(satorux,jshin): Rework this with ures_getByKeyWithFallback()
// once it becomes public. The short time format can be found at
// "calendar/gregorian/DateTimePatterns/3" in the resources.
scoped_ptr<icu::SimpleDateFormat> formatter(
static_cast<icu::SimpleDateFormat*>(
icu::DateFormat::createTimeInstance(icu::DateFormat::kShort)));
// Retrieve the short time format.
icu::UnicodeString pattern_unicode;
formatter->toPattern(pattern_unicode);
// Determine what hour clock type the current locale uses, by checking
// "a" (am/pm marker) in the short time format. This is reliable as "a"
// is used by all of 12-hour clock formats, but not any of 24-hour clock
// formats, as shown below.
//
// % grep -A4 DateTimePatterns third_party/icu/source/data/locales/*.txt |
// grep -B1 -- -- |grep -v -- '--' |
// perl -nle 'print $1 if /^\S+\s+"(.*)"/' |sort -u
//
// H.mm
// H:mm
// HH.mm
// HH:mm
// a h:mm
// ah:mm
// ahh:mm
// h-mm a
// h:mm a
// hh:mm a
//
// See http://userguide.icu-project.org/formatparse/datetime for details
// about the date/time format syntax.
if (pattern_unicode.indexOf('a') == -1) {
return k24HourClock;
} else {
return k12HourClock;
}
}
} // namespace base
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