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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef DateComponents_h
#define DateComponents_h
#include <limits>
#include <wtf/Forward.h>
#include <wtf/unicode/Unicode.h>
namespace WebCore {
// A DateComponents instance represents one of the following date and time combinations:
// * Month type: year-month
// * Date type: year-month-day
// * Week type: year-week
// * Time type: hour-minute-second-millisecond
// * DateTime or DateTimeLocal type: year-month-day hour-minute-second-millisecond
class DateComponents {
public:
DateComponents()
: m_millisecond(0)
, m_second(0)
, m_minute(0)
, m_hour(0)
, m_monthDay(0)
, m_month(0)
, m_year(0)
, m_week(0)
, m_type(Invalid)
{
}
enum Type {
Invalid,
Date,
DateTime,
DateTimeLocal,
Month,
Time,
Week,
};
int millisecond() const { return m_millisecond; }
int second() const { return m_second; }
int minute() const { return m_minute; }
int hour() const { return m_hour; }
int monthDay() const { return m_monthDay; }
int month() const { return m_month; }
int fullYear() const { return m_year; }
int week() const { return m_week; }
Type type() const { return m_type; }
enum SecondFormat {
None, // Suppress the second part and the millisecond part if they are 0.
Second, // Always show the second part, and suppress the millisecond part if it is 0.
Millisecond // Always show the second part and the millisecond part.
};
// Returns an ISO 8601 representation for this instance.
// The format argument is valid for DateTime, DateTimeLocal, and Time types.
String toString(SecondFormat format = None) const;
// parse*() and setMillisecondsSince*() functions are initializers for an
// DateComponents instance. If these functions return false, the instance
// might be invalid.
// The following six functions parse the input 'src' whose length is
// 'length', and updates some fields of this instance. The parsing starts at
// src[start] and examines characters before src[length].
// 'src' must be non-null. The 'src' string doesn't need to be
// null-terminated.
// The functions return true if the parsing succeeds, and set 'end' to the
// next index after the last consumed. Extra leading characters cause parse
// failures, and the trailing extra characters don't cause parse failures.
// Sets year and month.
bool parseMonth(const UChar* src, unsigned length, unsigned start, unsigned& end);
// Sets year, month and monthDay.
bool parseDate(const UChar* src, unsigned length, unsigned start, unsigned& end);
// Sets year and week.
bool parseWeek(const UChar* src, unsigned length, unsigned start, unsigned& end);
// Sets hour, minute, second and millisecond.
bool parseTime(const UChar* src, unsigned length, unsigned start, unsigned& end);
// Sets year, month, monthDay, hour, minute, second and millisecond.
bool parseDateTimeLocal(const UChar* src, unsigned length, unsigned start, unsigned& end);
// Sets year, month, monthDay, hour, minute, second and millisecond, and adjusts timezone.
bool parseDateTime(const UChar* src, unsigned length, unsigned start, unsigned& end);
// The following setMillisecondsSinceEpochFor*() functions take
// the number of milliseconds since 1970-01-01 00:00:00.000 UTC as
// the argument, and update all fields for the corresponding
// DateComponents type. The functions return true if it succeeds, and
// false if they fail.
// For Date type. Updates m_year, m_month and m_monthDay.
bool setMillisecondsSinceEpochForDate(double ms);
// For DateTime type. Updates m_year, m_month, m_monthDay, m_hour, m_minute, m_second and m_millisecond.
bool setMillisecondsSinceEpochForDateTime(double ms);
// For DateTimeLocal type. Updates m_year, m_month, m_monthDay, m_hour, m_minute, m_second and m_millisecond.
bool setMillisecondsSinceEpochForDateTimeLocal(double ms);
// For Month type. Updates m_year and m_month.
bool setMillisecondsSinceEpochForMonth(double ms);
// For Week type. Updates m_year and m_week.
bool setMillisecondsSinceEpochForWeek(double ms);
// For Time type. Updates m_hour, m_minute, m_second and m_millisecond.
bool setMillisecondsSinceMidnight(double ms);
// Another initializer for Month type. Updates m_year and m_month.
bool setMonthsSinceEpoch(double months);
// Returns the number of milliseconds from 1970-01-01 00:00:00 UTC.
// For a DateComponents initialized with parseDateTimeLocal(),
// millisecondsSinceEpoch() returns a value for UTC timezone.
double millisecondsSinceEpoch() const;
// Returns the number of months from 1970-01.
// Do not call this for types other than Month.
double monthsSinceEpoch() const;
static inline double invalidMilliseconds() { return std::numeric_limits<double>::quiet_NaN(); }
// Minimum and maxmimum limits for setMillisecondsSince*(),
// setMonthsSinceEpoch(), millisecondsSinceEpoch(), and monthsSinceEpoch().
static inline double minimumDate() { return -62135596800000.0; } // 0001-01-01T00:00Z
static inline double minimumDateTime() { return -62135596800000.0; } // ditto.
static inline double minimumMonth() { return (1 - 1970) * 12.0 + 1 - 1; } // 0001-01
static inline double minimumTime() { return 0; } // 00:00:00.000
static inline double minimumWeek() { return -62135596800000.0; } // 0001-01-01, the first Monday of 0001.
static inline double maximumDate() { return 8640000000000000.0; } // 275760-09-13T00:00Z
static inline double maximumDateTime() { return 8640000000000000.0; } // ditto.
static inline double maximumMonth() { return (275760 - 1970) * 12.0 + 9 - 1; } // 275760-09
static inline double maximumTime() { return 86399999; } // 23:59:59.999
static inline double maximumWeek() { return 8639999568000000.0; } // 275760-09-08, the Monday of the week including 275760-09-13.
// HTML5 uses ISO-8601 format with year >= 1. Gregorian calendar started in
// 1582. However, we need to support 0001-01-01 in Gregorian calendar rule.
static inline int minimumYear() { return 1; }
// Date in ECMAScript can't represent dates later than 275760-09-13T00:00Z.
// So, we have the same upper limit in HTML5 date/time types.
static inline int maximumYear() { return 275760; }
static const int minimumWeekNumber;
static const int maximumWeekNumber;
private:
// Returns the maximum week number in this DateComponents's year.
// The result is either of 52 and 53.
int maxWeekNumberInYear() const;
bool parseYear(const UChar* src, unsigned length, unsigned start, unsigned& end);
bool addDay(int);
bool addMinute(int);
bool parseTimeZone(const UChar* src, unsigned length, unsigned start, unsigned& end);
// Helper for millisecondsSinceEpoch().
double millisecondsSinceEpochForTime() const;
// Helpers for setMillisecondsSinceEpochFor*().
bool setMillisecondsSinceEpochForDateInternal(double ms);
void setMillisecondsSinceMidnightInternal(double ms);
// Helper for toString().
String toStringForTime(SecondFormat) const;
// m_weekDay values
enum {
Sunday = 0,
Monday,
Tuesday,
Wednesday,
Thursday,
Friday,
Saturday,
};
int m_millisecond; // 0 - 999
int m_second;
int m_minute;
int m_hour;
int m_monthDay; // 1 - 31
int m_month; // 0:January - 11:December
int m_year; // 1582 -
int m_week; // 1 - 53
Type m_type;
};
} // namespace WebCore
#endif // DateComponents_h
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