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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) 1999-2006, 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;
package body GNAT.Calendar.Time_IO is
type Month_Name is
(January,
February,
March,
April,
May,
June,
July,
August,
September,
October,
November,
December);
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;
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 := Picture'First;
begin
Split (Date, Year, Month, Day, Hour, Minute, Second, Sub_Second);
loop
-- A directive has the following format "%[-_]."
if Picture (P) = '%' then
Padding := Zero;
if P = Picture'Last then
raise Picture_Error;
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;
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
Sec : constant Sec_Number :=
Sec_Number (Julian_Day (Year, Month, Day)
- Julian_Day (1970, 1, 1)) * 86_400
+ Sec_Number (Hour) * 3_600
+ Sec_Number (Minute) * 60
+ Sec_Number (Second);
begin
Result := Result & Image (Sec, None);
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 : Natural range 0 .. 6;
begin
if Day_Of_Week (Date) = Sunday then
DOW := 0;
else
DOW := Day_Name'Pos (Day_Of_Week (Date));
end if;
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;
end case;
P := P + 2;
else
Result := Result & Picture (P);
P := P + 1;
end if;
exit when P > Picture'Last;
end loop;
return To_String (Result);
end Image;
-----------
-- Value --
-----------
function Value (Date : String) return Ada.Calendar.Time is
D : String (1 .. 19);
D_Length : constant Natural := Date'Length;
Year : Year_Number;
Month : Month_Number;
Day : Day_Number;
Hour : Hour_Number;
Minute : Minute_Number;
Second : Second_Number;
Sub_Second : Second_Duration;
procedure Extract_Date
(Year : out Year_Number;
Month : out Month_Number;
Day : out Day_Number;
Y2K : Boolean := False);
-- Try and extract a date value from string D. Set Y2K to True to
-- account for the 20YY case. Raise Constraint_Error if the portion
-- of D corresponding to the date is not well formatted.
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;
Y2K : Boolean := False)
is
Delim_Index : Positive := 5;
begin
if Y2K then
Delim_Index := 3;
end if;
if (D (Delim_Index) /= '-' or else D (Delim_Index + 3) /= '-')
and then
(D (Delim_Index) /= '/' or else D (Delim_Index + 3) /= '/')
then
raise Constraint_Error;
end if;
if Y2K then
Year := Year_Number'Value ("20" & D (1 .. 2));
Month := Month_Number'Value (D (4 .. 5));
Day := Day_Number'Value (D (7 .. 8));
else
Year := Year_Number'Value (D (1 .. 4));
Month := Month_Number'Value (D (6 .. 7));
Day := Day_Number'Value (D (9 .. 10));
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 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 Extract_Time;
-- Start of processing for Value
begin
Split (Clock, Year, Month, Day, Hour, Minute, Second, Sub_Second);
Sub_Second := 0.0;
-- Length checks
if D_Length /= 8
and then D_Length /= 10
and then D_Length /= 17
and then D_Length /= 19
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;
-- Case 1:
-- hh:mm:ss
-- yy*mm*dd
if D_Length = 8 then
if D (3) = ':' then
Extract_Time (1, Hour, Minute, Second);
else
Extract_Date (Year, Month, Day, True);
Hour := 0;
Minute := 0;
Second := 0;
end if;
-- Case 2:
-- yyyy*mm*dd
elsif D_Length = 10 then
Extract_Date (Year, Month, Day);
Hour := 0;
Minute := 0;
Second := 0;
-- Case 3:
-- yy*mm*dd hh:mm:ss
elsif D_Length = 17 then
Extract_Date (Year, Month, Day, True);
Extract_Time (10, Hour, Minute, Second, True);
-- Case 4:
-- yyyy*mm*dd hh:mm:ss
else
Extract_Date (Year, Month, Day);
Extract_Time (12, Hour, Minute, Second, True);
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, Sub_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;
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