1 /* 2 * Copyright (C) 2009 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef DateComponents_h 32 #define DateComponents_h 33 34 #include <limits> 35 #include "wtf/Forward.h" 36 #include "wtf/unicode/Unicode.h" 37 38 namespace WebCore { 39 40 // A DateComponents instance represents one of the following date and time combinations: 41 // * Month type: year-month 42 // * Date type: year-month-day 43 // * Week type: year-week 44 // * Time type: hour-minute-second-millisecond 45 // * DateTime or DateTimeLocal type: year-month-day hour-minute-second-millisecond 46 class DateComponents { 47 public: 48 DateComponents() 49 : m_millisecond(0) 50 , m_second(0) 51 , m_minute(0) 52 , m_hour(0) 53 , m_monthDay(0) 54 , m_month(0) 55 , m_year(0) 56 , m_week(0) 57 , m_type(Invalid) 58 { 59 } 60 61 enum Type { 62 Invalid, 63 Date, 64 DateTime, 65 DateTimeLocal, 66 Month, 67 Time, 68 Week, 69 }; 70 71 int millisecond() const { return m_millisecond; } 72 int second() const { return m_second; } 73 int minute() const { return m_minute; } 74 int hour() const { return m_hour; } 75 int monthDay() const { return m_monthDay; } 76 int month() const { return m_month; } 77 int fullYear() const { return m_year; } 78 int week() const { return m_week; } 79 Type type() const { return m_type; } 80 81 enum SecondFormat { 82 None, // Suppress the second part and the millisecond part if they are 0. 83 Second, // Always show the second part, and suppress the millisecond part if it is 0. 84 Millisecond // Always show the second part and the millisecond part. 85 }; 86 87 // Returns an ISO 8601 representation for this instance. 88 // The format argument is valid for DateTime, DateTimeLocal, and Time types. 89 String toString(SecondFormat format = None) const; 90 91 // parse*() and setMillisecondsSince*() functions are initializers for an 92 // DateComponents instance. If these functions return false, the instance 93 // might be invalid. 94 95 // The following six functions parse the input 'src' whose length is 96 // 'length', and updates some fields of this instance. The parsing starts at 97 // src[start] and examines characters before src[length]. 98 // 'src' must be non-null. The 'src' string doesn't need to be 99 // null-terminated. 100 // The functions return true if the parsing succeeds, and set 'end' to the 101 // next index after the last consumed. Extra leading characters cause parse 102 // failures, and the trailing extra characters don't cause parse failures. 103 104 // Sets year and month. 105 bool parseMonth(const String&, unsigned start, unsigned& end); 106 // Sets year, month and monthDay. 107 bool parseDate(const String&, unsigned start, unsigned& end); 108 // Sets year and week. 109 bool parseWeek(const String&, unsigned start, unsigned& end); 110 // Sets hour, minute, second and millisecond. 111 bool parseTime(const String&, unsigned start, unsigned& end); 112 // Sets year, month, monthDay, hour, minute, second and millisecond. 113 bool parseDateTimeLocal(const String&, unsigned start, unsigned& end); 114 // Sets year, month, monthDay, hour, minute, second and millisecond, and adjusts timezone. 115 bool parseDateTime(const String&, unsigned start, unsigned& end); 116 117 // The following setMillisecondsSinceEpochFor*() functions take 118 // the number of milliseconds since 1970-01-01 00:00:00.000 UTC as 119 // the argument, and update all fields for the corresponding 120 // DateComponents type. The functions return true if it succeeds, and 121 // false if they fail. 122 123 // For Date type. Updates m_year, m_month and m_monthDay. 124 bool setMillisecondsSinceEpochForDate(double ms); 125 // For DateTime type. Updates m_year, m_month, m_monthDay, m_hour, m_minute, m_second and m_millisecond. 126 bool setMillisecondsSinceEpochForDateTime(double ms); 127 // For DateTimeLocal type. Updates m_year, m_month, m_monthDay, m_hour, m_minute, m_second and m_millisecond. 128 bool setMillisecondsSinceEpochForDateTimeLocal(double ms); 129 // For Month type. Updates m_year and m_month. 130 bool setMillisecondsSinceEpochForMonth(double ms); 131 // For Week type. Updates m_year and m_week. 132 bool setMillisecondsSinceEpochForWeek(double ms); 133 134 // For Time type. Updates m_hour, m_minute, m_second and m_millisecond. 135 bool setMillisecondsSinceMidnight(double ms); 136 137 // Another initializer for Month type. Updates m_year and m_month. 138 bool setMonthsSinceEpoch(double months); 139 140 // Returns the number of milliseconds from 1970-01-01 00:00:00 UTC. 141 // For a DateComponents initialized with parseDateTimeLocal(), 142 // millisecondsSinceEpoch() returns a value for UTC timezone. 143 double millisecondsSinceEpoch() const; 144 // Returns the number of months from 1970-01. 145 // Do not call this for types other than Month. 146 double monthsSinceEpoch() const; 147 static inline double invalidMilliseconds() { return std::numeric_limits<double>::quiet_NaN(); } 148 149 // Minimum and maxmimum limits for setMillisecondsSince*(), 150 // setMonthsSinceEpoch(), millisecondsSinceEpoch(), and monthsSinceEpoch(). 151 static inline double minimumDate() { return -62135596800000.0; } // 0001-01-01T00:00Z 152 static inline double minimumDateTime() { return -62135596800000.0; } // ditto. 153 static inline double minimumMonth() { return (1 - 1970) * 12.0 + 1 - 1; } // 0001-01 154 static inline double minimumTime() { return 0; } // 00:00:00.000 155 static inline double minimumWeek() { return -62135596800000.0; } // 0001-01-01, the first Monday of 0001. 156 static inline double maximumDate() { return 8640000000000000.0; } // 275760-09-13T00:00Z 157 static inline double maximumDateTime() { return 8640000000000000.0; } // ditto. 158 static inline double maximumMonth() { return (275760 - 1970) * 12.0 + 9 - 1; } // 275760-09 159 static inline double maximumTime() { return 86399999; } // 23:59:59.999 160 static inline double maximumWeek() { return 8639999568000000.0; } // 275760-09-08, the Monday of the week including 275760-09-13. 161 162 // HTML5 uses ISO-8601 format with year >= 1. Gregorian calendar started in 163 // 1582. However, we need to support 0001-01-01 in Gregorian calendar rule. 164 static inline int minimumYear() { return 1; } 165 // Date in ECMAScript can't represent dates later than 275760-09-13T00:00Z. 166 // So, we have the same upper limit in HTML5 date/time types. 167 static inline int maximumYear() { return 275760; } 168 static const int minimumWeekNumber; 169 static const int maximumWeekNumber; 170 171 private: 172 // Returns the maximum week number in this DateComponents's year. 173 // The result is either of 52 and 53. 174 int maxWeekNumberInYear() const; 175 bool parseYear(const String&, unsigned start, unsigned& end); 176 bool addDay(int); 177 bool addMinute(int); 178 bool parseTimeZone(const String&, unsigned start, unsigned& end); 179 // Helper for millisecondsSinceEpoch(). 180 double millisecondsSinceEpochForTime() const; 181 // Helpers for setMillisecondsSinceEpochFor*(). 182 bool setMillisecondsSinceEpochForDateInternal(double ms); 183 void setMillisecondsSinceMidnightInternal(double ms); 184 // Helper for toString(). 185 String toStringForTime(SecondFormat) const; 186 187 // m_weekDay values 188 enum { 189 Sunday = 0, 190 Monday, 191 Tuesday, 192 Wednesday, 193 Thursday, 194 Friday, 195 Saturday, 196 }; 197 198 int m_millisecond; // 0 - 999 199 int m_second; 200 int m_minute; 201 int m_hour; 202 int m_monthDay; // 1 - 31 203 int m_month; // 0:January - 11:December 204 int m_year; // 1582 - 205 int m_week; // 1 - 53 206 207 Type m_type; 208 }; 209 210 211 } // namespace WebCore 212 213 #endif // DateComponents_h 214
