[MD History] Fix toolbar dates in grouped mode.

base/i18n/time_formatting.cc

 // 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 <stddef.h>
 
 #include <memory>
 
 #include "base/logging.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/dtitvfmt.h"
 #include "third_party/icu/source/i18n/unicode/dtptngen.h"
 #include "third_party/icu/source/i18n/unicode/fmtable.h"
 #include "third_party/icu/source/i18n/unicode/measfmt.h"
 #include "third_party/icu/source/i18n/unicode/smpdtfmt.h"
 
 namespace base {
 namespace {
 
 string16 TimeFormat(const icu::DateFormat* formatter,
                     const Time& time) {
@@ skipping 49 matching lines @@
   switch (width) {
     case DURATION_WIDTH_WIDE: return UMEASFMT_WIDTH_WIDE;
     case DURATION_WIDTH_SHORT: return UMEASFMT_WIDTH_SHORT;
     case DURATION_WIDTH_NARROW: return UMEASFMT_WIDTH_NARROW;
     case DURATION_WIDTH_NUMERIC: return UMEASFMT_WIDTH_NUMERIC;
   }
   NOTREACHED();
   return UMEASFMT_WIDTH_COUNT;
 }
 
+const char* DateFormatToString(DateFormat format) {
+  switch (format) {
+    case DATE_FORMAT_YEAR_MONTH:
+      return UDAT_YEAR_MONTH;
+    case DATE_FORMAT_MONTH_WEEKDAY_DAY:
+      return UDAT_MONTH_WEEKDAY_DAY;
+  }
+  NOTREACHED();
+  return UDAT_YEAR_MONTH_DAY;
+}
+
 }  // namespace
 
 string16 TimeFormatTimeOfDay(const Time& time) {
   // We can omit the locale parameter because the default should match
   // Chrome's application locale.
   std::unique_ptr<icu::DateFormat> formatter(
       icu::DateFormat::createTimeInstance(icu::DateFormat::kShort));
   return TimeFormat(formatter.get(), time);
 }
 
@@ skipping 40 matching lines @@
   return TimeFormat(formatter.get(), time);
 }
 
 string16 TimeFormatShortDateAndTimeWithTimeZone(const Time& time) {
   std::unique_ptr<icu::DateFormat> formatter(
       icu::DateFormat::createDateTimeInstance(icu::DateFormat::kShort,
                                               icu::DateFormat::kLong));
   return TimeFormat(formatter.get(), time);
 }
 
+string16 TimeFormatMonthAndYear(const Time& time) {
+  icu::SimpleDateFormat formatter =
+      CreateSimpleDateFormatter(DateFormatToString(DATE_FORMAT_YEAR_MONTH));
+  return TimeFormat(&formatter, time);
+}
+
 string16 TimeFormatFriendlyDateAndTime(const Time& time) {
   std::unique_ptr<icu::DateFormat> formatter(
       icu::DateFormat::createDateTimeInstance(icu::DateFormat::kFull));
   return TimeFormat(formatter.get(), time);
 }
 
 string16 TimeFormatFriendlyDate(const Time& time) {
   std::unique_ptr<icu::DateFormat> formatter(
       icu::DateFormat::createDateInstance(icu::DateFormat::kFull));
   return TimeFormat(formatter.get(), time);
@@ skipping 10 matching lines @@
   const icu::Measure measures[] = {
       icu::Measure(hours, icu::MeasureUnit::createHour(status), status),
       icu::Measure(minutes, icu::MeasureUnit::createMinute(status), status)};
   icu::MeasureFormat measure_format(icu::Locale::getDefault(), u_width, status);
   icu::UnicodeString formatted;
   icu::FieldPosition ignore(icu::FieldPosition::DONT_CARE);
   measure_format.formatMeasures(measures, 2, formatted, ignore, status);
   return base::string16(formatted.getBuffer(), formatted.length());
 }
 
+string16 DateIntervalFormat(const Time& begin_time,
+                            const Time& end_time,
+                            DateFormat format) {
+  UErrorCode status = U_ZERO_ERROR;
+
+  std::unique_ptr<icu::DateIntervalFormat> formatter(
+      icu::DateIntervalFormat::createInstance(DateFormatToString(format),
+                                              status));
+
+  icu::FieldPosition pos = 0;
+  UDate start_date = static_cast<UDate>(begin_time.ToDoubleT() * 1000);
+  UDate end_date = static_cast<UDate>(end_time.ToDoubleT() * 1000);
+  icu::DateInterval interval(start_date, end_date);
+  icu::UnicodeString formatted;
+  formatter->format(&interval, formatted, pos, status);
+  return string16(formatted.getBuffer(),
+                  static_cast<size_t>(formatted.length()));
+}
+
 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.
   std::unique_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);
@@ skipping 21 matching lines @@
   // 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