using System; namespace Newtonsoft.Json.Utilities { internal struct DateTimeParser { private const short MaxFractionDigits = 7; public int Year; public int Month; public int Day; public int Hour; public int Minute; public int Second; public int Fraction; public int ZoneHour; public int ZoneMinute; public ParserTimeZone Zone; private string _text; private int _length; private static readonly int[] Power10; private static readonly int Lzyyyy; private static readonly int Lzyyyy_; private static readonly int Lzyyyy_MM; private static readonly int Lzyyyy_MM_; private static readonly int Lzyyyy_MM_dd; private static readonly int Lzyyyy_MM_ddT; private static readonly int LzHH; private static readonly int LzHH_; private static readonly int LzHH_mm; private static readonly int LzHH_mm_; private static readonly int LzHH_mm_ss; private static readonly int Lz_; private static readonly int Lz_zz; private static readonly int Lz_zz_; private static readonly int Lz_zz_zz; static DateTimeParser() { Power10 = new int[7] { -1, 10, 100, 1000, 10000, 100000, 1000000 }; Lzyyyy = "yyyy".Length; Lzyyyy_ = "yyyy-".Length; Lzyyyy_MM = "yyyy-MM".Length; Lzyyyy_MM_ = "yyyy-MM-".Length; Lzyyyy_MM_dd = "yyyy-MM-dd".Length; Lzyyyy_MM_ddT = "yyyy-MM-ddT".Length; LzHH = "HH".Length; LzHH_ = "HH:".Length; LzHH_mm = "HH:mm".Length; LzHH_mm_ = "HH:mm:".Length; LzHH_mm_ss = "HH:mm:ss".Length; Lz_ = "-".Length; Lz_zz = "-zz".Length; Lz_zz_ = "-zz:".Length; Lz_zz_zz = "-zz:zz".Length; } public bool Parse(string text) { _text = text; _length = text.Length; if (ParseDate(0) && ParseChar(Lzyyyy_MM_dd, 'T') && ParseTimeAndZoneAndWhitespace(Lzyyyy_MM_ddT)) return true; return false; } private bool ParseDate(int start) { if (Parse4Digit(start, out Year) && 1 <= Year && ParseChar(start + Lzyyyy, '-') && Parse2Digit(start + Lzyyyy_, out Month) && 1 <= Month && Month <= 12 && ParseChar(start + Lzyyyy_MM, '-') && Parse2Digit(start + Lzyyyy_MM_, out Day) && 1 <= Day) return Day <= DateTime.DaysInMonth(Year, Month); return false; } private bool ParseTimeAndZoneAndWhitespace(int start) { if (ParseTime(ref start)) return ParseZone(start); return false; } private bool ParseTime(ref int start) { if (!Parse2Digit(start, out Hour) || Hour >= 24 || !ParseChar(start + LzHH, ':') || !Parse2Digit(start + LzHH_, out Minute) || Minute >= 60 || !ParseChar(start + LzHH_mm, ':') || !Parse2Digit(start + LzHH_mm_, out Second) || Second >= 60) return false; start += LzHH_mm_ss; if (ParseChar(start, '.')) { Fraction = 0; int num = 0; while (++start < _length && num < 7) { int num2 = _text[start] - 48; if (num2 < 0 || num2 > 9) break; Fraction = Fraction * 10 + num2; num++; } if (num < 7) { if (num == 0) return false; Fraction *= Power10[7 - num]; } } return true; } private bool ParseZone(int start) { if (start < _length) { char c = _text[start]; if (c == 'Z' || c == 'z') { Zone = ParserTimeZone.Utc; start++; } else { if (start + 2 < _length && Parse2Digit(start + Lz_, out ZoneHour) && ZoneHour <= 99) { switch (c) { case '-': Zone = ParserTimeZone.LocalWestOfUtc; start += Lz_zz; break; case '+': Zone = ParserTimeZone.LocalEastOfUtc; start += Lz_zz; break; } } if (start < _length) { if (ParseChar(start, ':')) { start++; if (start + 1 < _length && Parse2Digit(start, out ZoneMinute) && ZoneMinute <= 99) start += 2; } else if (start + 1 < _length && Parse2Digit(start, out ZoneMinute) && ZoneMinute <= 99) { start += 2; } } } } return start == _length; } private bool Parse4Digit(int start, out int num) { if (start + 3 < _length) { int num2 = _text[start] - 48; int num3 = _text[start + 1] - 48; int num4 = _text[start + 2] - 48; int num5 = _text[start + 3] - 48; if (0 <= num2 && num2 < 10 && 0 <= num3 && num3 < 10 && 0 <= num4 && num4 < 10 && 0 <= num5 && num5 < 10) { num = ((num2 * 10 + num3) * 10 + num4) * 10 + num5; return true; } } num = 0; return false; } private bool Parse2Digit(int start, out int num) { if (start + 1 < _length) { int num2 = _text[start] - 48; int num3 = _text[start + 1] - 48; if (0 <= num2 && num2 < 10 && 0 <= num3 && num3 < 10) { num = num2 * 10 + num3; return true; } } num = 0; return false; } private bool ParseChar(int start, char ch) { if (start < _length) return _text[start] == ch; return false; } } }