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------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- G N A T . C A L E N D A R . T I M E _ I O -- -- -- -- B o d y -- -- -- -- Copyright (C) 1999-2009, AdaCore -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 2, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; see file COPYING. If not, write -- -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- -- Boston, MA 02110-1301, USA. -- -- -- -- As a special exception, if other files instantiate generics from this -- -- unit, or you link this unit with other files to produce an executable, -- -- this unit does not by itself cause the resulting executable to be -- -- covered by the GNU General Public License. This exception does not -- -- however invalidate any other reasons why the executable file might be -- -- covered by the GNU Public License. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ with Ada.Calendar; use Ada.Calendar; with Ada.Characters.Handling; with Ada.Strings.Unbounded; use Ada.Strings.Unbounded; with Ada.Text_IO; with GNAT.Case_Util; package body GNAT.Calendar.Time_IO is type Month_Name is (January, February, March, April, May, June, July, August, September, October, November, December); function Month_Name_To_Number (Str : String) return Ada.Calendar.Month_Number; -- Converts a string that contains an abbreviated month name to a month -- number. Constraint_Error is raised if Str is not a valid month name. -- Comparison is case insensitive type Padding_Mode is (None, Zero, Space); type Sec_Number is mod 2 ** 64; -- Type used to compute the number of seconds since 01/01/1970. A 32 bit -- number will cover only a period of 136 years. This means that for date -- past 2106 the computation is not possible. A 64 bits number should be -- enough for a very large period of time. ----------------------- -- Local Subprograms -- ----------------------- function Am_Pm (H : Natural) return String; -- Return AM or PM depending on the hour H function Hour_12 (H : Natural) return Positive; -- Convert a 1-24h format to a 0-12 hour format function Image (Str : String; Length : Natural := 0) return String; -- Return Str capitalized and cut to length number of characters. If -- length is 0, then no cut operation is performed. function Image (N : Sec_Number; Padding : Padding_Mode := Zero; Length : Natural := 0) return String; -- Return image of N. This number is eventually padded with zeros or spaces -- depending of the length required. If length is 0 then no padding occurs. function Image (N : Natural; Padding : Padding_Mode := Zero; Length : Natural := 0) return String; -- As above with N provided in Integer format ----------- -- Am_Pm -- ----------- function Am_Pm (H : Natural) return String is begin if H = 0 or else H > 12 then return "PM"; else return "AM"; end if; end Am_Pm; ------------- -- Hour_12 -- ------------- function Hour_12 (H : Natural) return Positive is begin if H = 0 then return 12; elsif H <= 12 then return H; else -- H > 12 return H - 12; end if; end Hour_12; ----------- -- Image -- ----------- function Image (Str : String; Length : Natural := 0) return String is use Ada.Characters.Handling; Local : constant String := To_Upper (Str (Str'First)) & To_Lower (Str (Str'First + 1 .. Str'Last)); begin if Length = 0 then return Local; else return Local (1 .. Length); end if; end Image; ----------- -- Image -- ----------- function Image (N : Natural; Padding : Padding_Mode := Zero; Length : Natural := 0) return String is begin return Image (Sec_Number (N), Padding, Length); end Image; function Image (N : Sec_Number; Padding : Padding_Mode := Zero; Length : Natural := 0) return String is function Pad_Char return String; -------------- -- Pad_Char -- -------------- function Pad_Char return String is begin case Padding is when None => return ""; when Zero => return "00"; when Space => return " "; end case; end Pad_Char; -- Local Declarations NI : constant String := Sec_Number'Image (N); NIP : constant String := Pad_Char & NI (2 .. NI'Last); -- Start of processing for Image begin if Length = 0 or else Padding = None then return NI (2 .. NI'Last); else return NIP (NIP'Last - Length + 1 .. NIP'Last); end if; end Image; ----------- -- Image -- ----------- function Image (Date : Ada.Calendar.Time; Picture : Picture_String) return String is Padding : Padding_Mode := Zero; -- Padding is set for one directive Result : Unbounded_String; Year : Year_Number; Month : Month_Number; Day : Day_Number; Hour : Hour_Number; Minute : Minute_Number; Second : Second_Number; Sub_Second : Second_Duration; P : Positive; begin -- Get current time in split format Split (Date, Year, Month, Day, Hour, Minute, Second, Sub_Second); -- Null picture string is error if Picture = "" then raise Picture_Error with "null picture string"; end if; -- Loop through characters of picture string, building result Result := Null_Unbounded_String; P := Picture'First; while P <= Picture'Last loop -- A directive has the following format "%[-_]." if Picture (P) = '%' then Padding := Zero; if P = Picture'Last then raise Picture_Error with "picture string ends with '%"; end if; -- Check for GNU extension to change the padding if Picture (P + 1) = '-' then Padding := None; P := P + 1; elsif Picture (P + 1) = '_' then Padding := Space; P := P + 1; end if; if P = Picture'Last then raise Picture_Error with "picture string ends with '- or '_"; end if; case Picture (P + 1) is -- Literal % when '%' => Result := Result & '%'; -- A newline when 'n' => Result := Result & ASCII.LF; -- A horizontal tab when 't' => Result := Result & ASCII.HT; -- Hour (00..23) when 'H' => Result := Result & Image (Hour, Padding, 2); -- Hour (01..12) when 'I' => Result := Result & Image (Hour_12 (Hour), Padding, 2); -- Hour ( 0..23) when 'k' => Result := Result & Image (Hour, Space, 2); -- Hour ( 1..12) when 'l' => Result := Result & Image (Hour_12 (Hour), Space, 2); -- Minute (00..59) when 'M' => Result := Result & Image (Minute, Padding, 2); -- AM/PM when 'p' => Result := Result & Am_Pm (Hour); -- Time, 12-hour (hh:mm:ss [AP]M) when 'r' => Result := Result & Image (Hour_12 (Hour), Padding, Length => 2) & ':' & Image (Minute, Padding, Length => 2) & ':' & Image (Second, Padding, Length => 2) & ' ' & Am_Pm (Hour); -- Seconds since 1970-01-01 00:00:00 UTC -- (a nonstandard extension) when 's' => declare -- Compute the number of seconds using Ada.Calendar.Time -- values rather than Julian days to account for Daylight -- Savings Time. Neg : Boolean := False; Sec : Duration := Date - Time_Of (1970, 1, 1, 0.0); begin -- Avoid rounding errors and perform special processing -- for dates earlier than the Unix Epoc. if Sec > 0.0 then Sec := Sec - 0.5; elsif Sec < 0.0 then Neg := True; Sec := abs (Sec + 0.5); end if; -- Prepend a minus sign to the result since Sec_Number -- cannot handle negative numbers. if Neg then Result := Result & "-" & Image (Sec_Number (Sec), None); else Result := Result & Image (Sec_Number (Sec), None); end if; end; -- Second (00..59) when 'S' => Result := Result & Image (Second, Padding, Length => 2); -- Milliseconds (3 digits) -- Microseconds (6 digits) -- Nanoseconds (9 digits) when 'i' | 'e' | 'o' => declare Sub_Sec : constant Long_Integer := Long_Integer (Sub_Second * 1_000_000_000); Img1 : constant String := Sub_Sec'Img; Img2 : constant String := "00000000" & Img1 (Img1'First + 1 .. Img1'Last); Nanos : constant String := Img2 (Img2'Last - 8 .. Img2'Last); begin case Picture (P + 1) is when 'i' => Result := Result & Nanos (Nanos'First .. Nanos'First + 2); when 'e' => Result := Result & Nanos (Nanos'First .. Nanos'First + 5); when 'o' => Result := Result & Nanos; when others => null; end case; end; -- Time, 24-hour (hh:mm:ss) when 'T' => Result := Result & Image (Hour, Padding, Length => 2) & ':' & Image (Minute, Padding, Length => 2) & ':' & Image (Second, Padding, Length => 2); -- Locale's abbreviated weekday name (Sun..Sat) when 'a' => Result := Result & Image (Day_Name'Image (Day_Of_Week (Date)), 3); -- Locale's full weekday name, variable length -- (Sunday..Saturday) when 'A' => Result := Result & Image (Day_Name'Image (Day_Of_Week (Date))); -- Locale's abbreviated month name (Jan..Dec) when 'b' | 'h' => Result := Result & Image (Month_Name'Image (Month_Name'Val (Month - 1)), 3); -- Locale's full month name, variable length -- (January..December). when 'B' => Result := Result & Image (Month_Name'Image (Month_Name'Val (Month - 1))); -- Locale's date and time (Sat Nov 04 12:02:33 EST 1989) when 'c' => case Padding is when Zero => Result := Result & Image (Date, "%a %b %d %T %Y"); when Space => Result := Result & Image (Date, "%a %b %_d %_T %Y"); when None => Result := Result & Image (Date, "%a %b %-d %-T %Y"); end case; -- Day of month (01..31) when 'd' => Result := Result & Image (Day, Padding, 2); -- Date (mm/dd/yy) when 'D' | 'x' => Result := Result & Image (Month, Padding, 2) & '/' & Image (Day, Padding, 2) & '/' & Image (Year, Padding, 2); -- Day of year (001..366) when 'j' => Result := Result & Image (Day_In_Year (Date), Padding, 3); -- Month (01..12) when 'm' => Result := Result & Image (Month, Padding, 2); -- Week number of year with Sunday as first day of week -- (00..53) when 'U' => declare Offset : constant Natural := (Julian_Day (Year, 1, 1) + 1) mod 7; Week : constant Natural := 1 + ((Day_In_Year (Date) - 1) + Offset) / 7; begin Result := Result & Image (Week, Padding, 2); end; -- Day of week (0..6) with 0 corresponding to Sunday when 'w' => declare DOW : constant Natural range 0 .. 6 := (if Day_Of_Week (Date) = Sunday then 0 else Day_Name'Pos (Day_Of_Week (Date))); begin Result := Result & Image (DOW, Length => 1); end; -- Week number of year with Monday as first day of week -- (00..53) when 'W' => Result := Result & Image (Week_In_Year (Date), Padding, 2); -- Last two digits of year (00..99) when 'y' => declare Y : constant Natural := Year - (Year / 100) * 100; begin Result := Result & Image (Y, Padding, 2); end; -- Year (1970...) when 'Y' => Result := Result & Image (Year, None, 4); when others => raise Picture_Error with "unknown format character in picture string"; end case; -- Skip past % and format character P := P + 2; -- Character other than % is copied into the result else Result := Result & Picture (P); P := P + 1; end if; end loop; return To_String (Result); end Image; -------------------------- -- Month_Name_To_Number -- -------------------------- function Month_Name_To_Number (Str : String) return Ada.Calendar.Month_Number is subtype String3 is String (1 .. 3); Abbrev_Upper_Month_Names : constant array (Ada.Calendar.Month_Number) of String3 := ("JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"); -- Short version of the month names, used when parsing date strings S : String := Str; begin GNAT.Case_Util.To_Upper (S); for J in Abbrev_Upper_Month_Names'Range loop if Abbrev_Upper_Month_Names (J) = S then return J; end if; end loop; return Abbrev_Upper_Month_Names'First; end Month_Name_To_Number; ----------- -- Value -- ----------- function Value (Date : String) return Ada.Calendar.Time is D : String (1 .. 21); D_Length : constant Natural := Date'Length; Year : Year_Number; Month : Month_Number; Day : Day_Number; Hour : Hour_Number; Minute : Minute_Number; Second : Second_Number; procedure Extract_Date (Year : out Year_Number; Month : out Month_Number; Day : out Day_Number; Time_Start : out Natural); -- Try and extract a date value from string D. Time_Start is set to the -- first character that could be the start of time data. procedure Extract_Time (Index : Positive; Hour : out Hour_Number; Minute : out Minute_Number; Second : out Second_Number; Check_Space : Boolean := False); -- Try and extract a time value from string D starting from position -- Index. Set Check_Space to True to check whether the character at -- Index - 1 is a space. Raise Constraint_Error if the portion of D -- corresponding to the date is not well formatted. ------------------ -- Extract_Date -- ------------------ procedure Extract_Date (Year : out Year_Number; Month : out Month_Number; Day : out Day_Number; Time_Start : out Natural) is begin if D (3) = '-' or else D (3) = '/' then if D_Length = 8 or else D_Length = 17 then -- Formats are "yy*mm*dd" or "yy*mm*dd hh:mm:ss" if D (6) /= D (3) then raise Constraint_Error; end if; Year := Year_Number'Value ("20" & D (1 .. 2)); Month := Month_Number'Value (D (4 .. 5)); Day := Day_Number'Value (D (7 .. 8)); Time_Start := 10; elsif D_Length = 10 or else D_Length = 19 then -- Formats are "mm*dd*yyyy" or "mm*dd*yyyy hh:mm:ss" if D (6) /= D (3) then raise Constraint_Error; end if; Year := Year_Number'Value (D (7 .. 10)); Month := Month_Number'Value (D (1 .. 2)); Day := Day_Number'Value (D (4 .. 5)); Time_Start := 12; elsif D_Length = 11 or else D_Length = 20 then -- Formats are "dd*mmm*yyyy" or "dd*mmm*yyyy hh:mm:ss" if D (7) /= D (3) then raise Constraint_Error; end if; Year := Year_Number'Value (D (8 .. 11)); Month := Month_Name_To_Number (D (4 .. 6)); Day := Day_Number'Value (D (1 .. 2)); Time_Start := 13; else raise Constraint_Error; end if; elsif D (3) = ' ' then if D_Length = 11 or else D_Length = 20 then -- Possible formats are "dd mmm yyyy", "dd mmm yyyy hh:mm:ss" if D (7) /= ' ' then raise Constraint_Error; end if; Year := Year_Number'Value (D (8 .. 11)); Month := Month_Name_To_Number (D (4 .. 6)); Day := Day_Number'Value (D (1 .. 2)); Time_Start := 13; else raise Constraint_Error; end if; else if D_Length = 8 or else D_Length = 17 then -- Possible formats are "yyyymmdd" or "yyyymmdd hh:mm:ss" Year := Year_Number'Value (D (1 .. 4)); Month := Month_Number'Value (D (5 .. 6)); Day := Day_Number'Value (D (7 .. 8)); Time_Start := 10; elsif D_Length = 10 or else D_Length = 19 then -- Possible formats are "yyyy*mm*dd" or "yyyy*mm*dd hh:mm:ss" if (D (5) /= '-' and then D (5) /= '/') or else D (8) /= D (5) then raise Constraint_Error; end if; Year := Year_Number'Value (D (1 .. 4)); Month := Month_Number'Value (D (6 .. 7)); Day := Day_Number'Value (D (9 .. 10)); Time_Start := 12; elsif D_Length = 11 or else D_Length = 20 then -- Possible formats are "yyyy*mmm*dd" if (D (5) /= '-' and then D (5) /= '/') or else D (9) /= D (5) then raise Constraint_Error; end if; Year := Year_Number'Value (D (1 .. 4)); Month := Month_Name_To_Number (D (6 .. 8)); Day := Day_Number'Value (D (10 .. 11)); Time_Start := 13; elsif D_Length = 12 or else D_Length = 21 then -- Formats are "mmm dd, yyyy" or "mmm dd, yyyy hh:mm:ss" if D (4) /= ' ' or else D (7) /= ',' or else D (8) /= ' ' then raise Constraint_Error; end if; Year := Year_Number'Value (D (9 .. 12)); Month := Month_Name_To_Number (D (1 .. 3)); Day := Day_Number'Value (D (5 .. 6)); Time_Start := 14; else raise Constraint_Error; end if; end if; end Extract_Date; ------------------ -- Extract_Time -- ------------------ procedure Extract_Time (Index : Positive; Hour : out Hour_Number; Minute : out Minute_Number; Second : out Second_Number; Check_Space : Boolean := False) is begin -- If no time was specified in the string (do not allow trailing -- character either) if Index = D_Length + 2 then Hour := 0; Minute := 0; Second := 0; else -- Not enough characters left ? if Index /= D_Length - 7 then raise Constraint_Error; end if; if Check_Space and then D (Index - 1) /= ' ' then raise Constraint_Error; end if; if D (Index + 2) /= ':' or else D (Index + 5) /= ':' then raise Constraint_Error; end if; Hour := Hour_Number'Value (D (Index .. Index + 1)); Minute := Minute_Number'Value (D (Index + 3 .. Index + 4)); Second := Second_Number'Value (D (Index + 6 .. Index + 7)); end if; end Extract_Time; -- Local Declarations Time_Start : Natural := 1; -- Start of processing for Value begin -- Length checks if D_Length /= 8 and then D_Length /= 10 and then D_Length /= 11 and then D_Length /= 12 and then D_Length /= 17 and then D_Length /= 19 and then D_Length /= 20 and then D_Length /= 21 then raise Constraint_Error; end if; -- After the correct length has been determined, it is safe to create -- a local string copy in order to avoid String'First N arithmetic. D (1 .. D_Length) := Date; if D_Length /= 8 or else D (3) /= ':' then Extract_Date (Year, Month, Day, Time_Start); Extract_Time (Time_Start, Hour, Minute, Second, Check_Space => True); else declare Discard : Second_Duration; pragma Unreferenced (Discard); begin Split (Clock, Year, Month, Day, Hour, Minute, Second, Sub_Second => Discard); end; Extract_Time (1, Hour, Minute, Second, Check_Space => False); end if; -- Sanity checks if not Year'Valid or else not Month'Valid or else not Day'Valid or else not Hour'Valid or else not Minute'Valid or else not Second'Valid then raise Constraint_Error; end if; return Time_Of (Year, Month, Day, Hour, Minute, Second); end Value; -------------- -- Put_Time -- -------------- procedure Put_Time (Date : Ada.Calendar.Time; Picture : Picture_String) is begin Ada.Text_IO.Put (Image (Date, Picture)); end Put_Time; end GNAT.Calendar.Time_IO;