184 lines
9 KiB
Ada
184 lines
9 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- G N A T . C A L E N D A R --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1999-2014, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This package extends Ada.Calendar to handle Hour, Minute, Second,
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-- Second_Duration and Day_Of_Week and Day_In_Year from Calendar.Time.
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-- Second_Duration precision depends on the target clock precision.
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--
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-- GNAT.Calendar provides the same kind of abstraction found in Ada.Calendar.
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-- It provides Split and Time_Of to build and split a Time data. And it
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-- provides accessor functions to get only one of Hour, Minute, Second,
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-- Second_Duration. Other functions are to access more advanced values like
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-- Day_Of_Week, Day_In_Year and Week_In_Year.
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with Ada.Calendar;
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with Interfaces.C;
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package GNAT.Calendar is
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type Day_Name is
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(Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday);
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pragma Ordered (Day_Name);
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subtype Hour_Number is Natural range 0 .. 23;
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subtype Minute_Number is Natural range 0 .. 59;
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subtype Second_Number is Natural range 0 .. 59;
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subtype Second_Duration is Ada.Calendar.Day_Duration range 0.0 .. 1.0;
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subtype Day_In_Year_Number is Positive range 1 .. 366;
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subtype Week_In_Year_Number is Positive range 1 .. 53;
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No_Time : constant Ada.Calendar.Time;
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-- A constant set to the first date that can be represented by the type
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-- Time. It can be used to indicate an uninitialized date.
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function Hour (Date : Ada.Calendar.Time) return Hour_Number;
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function Minute (Date : Ada.Calendar.Time) return Minute_Number;
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function Second (Date : Ada.Calendar.Time) return Second_Number;
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function Sub_Second (Date : Ada.Calendar.Time) return Second_Duration;
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-- Hour, Minute, Second and Sub_Second returns the complete time data for
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-- the Date (H:M:S.SS). See Ada.Calendar for Year, Month, Day accessors.
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-- Second_Duration precision depends on the target clock precision.
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function Day_Of_Week (Date : Ada.Calendar.Time) return Day_Name;
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-- Return the day name
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function Day_In_Year (Date : Ada.Calendar.Time) return Day_In_Year_Number;
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-- Return the day number in the year. (1st January is day 1 and 31st
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-- December is day 365 or 366 for leap year).
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procedure Split
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(Date : Ada.Calendar.Time;
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Year : out Ada.Calendar.Year_Number;
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Month : out Ada.Calendar.Month_Number;
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Day : out Ada.Calendar.Day_Number;
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Hour : out Hour_Number;
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Minute : out Minute_Number;
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Second : out Second_Number;
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Sub_Second : out Second_Duration);
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-- Split a standard Ada.Calendar.Time value in date data (Year, Month, Day)
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-- and Time data (Hour, Minute, Second, Sub_Second).
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procedure Split_At_Locale
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(Date : Ada.Calendar.Time;
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Year : out Ada.Calendar.Year_Number;
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Month : out Ada.Calendar.Month_Number;
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Day : out Ada.Calendar.Day_Number;
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Hour : out Hour_Number;
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Minute : out Minute_Number;
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Second : out Second_Number;
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Sub_Second : out Second_Duration);
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-- Split a standard Ada.Calendar.Time value in date data (Year, Month, Day)
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-- and Time data (Hour, Minute, Second, Sub_Second). This version of Split
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-- utilizes the time zone and DST bias of the locale (equivalent to Clock).
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-- Due to this simplified behavior, the implementation does not require
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-- expensive system calls on targets such as Windows.
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-- WARNING: Split_At_Locale is no longer aware of historic events and may
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-- produce inaccurate results over DST changes which occurred in the past.
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function Time_Of
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(Year : Ada.Calendar.Year_Number;
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Month : Ada.Calendar.Month_Number;
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Day : Ada.Calendar.Day_Number;
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Hour : Hour_Number;
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Minute : Minute_Number;
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Second : Second_Number;
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Sub_Second : Second_Duration := 0.0) return Ada.Calendar.Time;
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-- Return an Ada.Calendar.Time data built from the date and time values
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function Time_Of_At_Locale
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(Year : Ada.Calendar.Year_Number;
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Month : Ada.Calendar.Month_Number;
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Day : Ada.Calendar.Day_Number;
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Hour : Hour_Number;
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Minute : Minute_Number;
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Second : Second_Number;
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Sub_Second : Second_Duration := 0.0) return Ada.Calendar.Time;
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-- Return an Ada.Calendar.Time data built from the date and time values.
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-- This version of Time_Of utilizes the time zone and DST bias of the
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-- locale (equivalent to Clock). Due to this simplified behavior, the
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-- implementation does not require expensive system calls on targets such
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-- as Windows.
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-- WARNING: Split_At_Locale is no longer aware of historic events and may
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-- produce inaccurate results over DST changes which occurred in the past.
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function Week_In_Year (Date : Ada.Calendar.Time) return Week_In_Year_Number;
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-- Return the week number as defined in ISO 8601. A week always starts on
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-- a Monday and the first week of a particular year is the one containing
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-- the first Thursday. A year may have 53 weeks when January 1st is a
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-- Wednesday and the year is leap or January 1st is a Thursday. Note that
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-- the last days of December may belong to the first week on the next year
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-- and conversely, the first days of January may belong to the last week
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-- of the last year.
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procedure Year_Week_In_Year
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(Date : Ada.Calendar.Time;
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Year : out Ada.Calendar.Year_Number;
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Week : out Week_In_Year_Number);
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-- Return the week number as defined in ISO 8601 along with the year in
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-- which the week occurs.
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-- C timeval conversion
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-- C timeval represent a duration (used in Select for example). This
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-- structure is composed of a number of seconds and a number of micro
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-- seconds. The timeval structure is not exposed here because its
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-- definition is target dependent. Interface to C programs is done via a
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-- pointer to timeval structure.
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type timeval is private;
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function To_Duration (T : not null access timeval) return Duration;
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function To_Timeval (D : Duration) return timeval;
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private
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-- This is a dummy declaration that should be the largest possible timeval
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-- structure of all supported targets.
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type timeval is array (1 .. 3) of Interfaces.C.long;
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function Julian_Day
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(Year : Ada.Calendar.Year_Number;
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Month : Ada.Calendar.Month_Number;
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Day : Ada.Calendar.Day_Number) return Integer;
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-- Compute Julian day number
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--
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-- The code of this function is a modified version of algorithm 199 from
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-- the Collected Algorithms of the ACM. The author of algorithm 199 is
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-- Robert G. Tantzen.
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No_Time : constant Ada.Calendar.Time :=
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Ada.Calendar.Time_Of
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(Ada.Calendar.Year_Number'First,
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Ada.Calendar.Month_Number'First,
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Ada.Calendar.Day_Number'First);
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end GNAT.Calendar;
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