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matreshka-internals-calendars.ads
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matreshka-internals-calendars.ads
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------------------------------------------------------------------------------
-- --
-- Matreshka Project --
-- --
-- Localization, Internationalization, Globalization for Ada --
-- --
-- Runtime Library Component --
-- --
------------------------------------------------------------------------------
-- --
-- Copyright © 2011-2013, Vadim Godunko <vgodunko@gmail.com> --
-- All rights reserved. --
-- --
-- Redistribution and use in source and binary forms, with or without --
-- modification, are permitted provided that the following conditions --
-- are met: --
-- --
-- * Redistributions of source code must retain the above copyright --
-- notice, this list of conditions and the following disclaimer. --
-- --
-- * Redistributions in binary form must reproduce the above copyright --
-- notice, this list of conditions and the following disclaimer in the --
-- documentation and/or other materials provided with the distribution. --
-- --
-- * Neither the name of the Vadim Godunko, IE nor the names of its --
-- contributors may be used to endorse or promote products derived from --
-- this software without specific prior written permission. --
-- --
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS --
-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT --
-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR --
-- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT --
-- HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, --
-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED --
-- TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR --
-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF --
-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING --
-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS --
-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. --
-- --
------------------------------------------------------------------------------
-- $Revision$ $Date$
------------------------------------------------------------------------------
with Interfaces;
package Matreshka.Internals.Calendars is
pragma Preelaborate;
-- Universal Time Coordinated (UTC) representation from the X/Open DCE Time
-- Service is used as internal representation. It is defined as follows:
--
-- Time units 100 nanoseconds (10-7 seconds)
--
-- Base time 15 October 1582 00:00:00.
--
-- Approximate range AD 30,000
--
-- UTC time in this implementation always refers to time in Greenwich Time
-- Zone.
type Absolute_Time is new Interfaces.Integer_64;
-- The corresponding internal representations of relative time is the same
-- one as for absolute time, and hence with similar characteristics:
--
-- Time units 100 nanoseconds (10-7 seconds)
--
-- Approximate range +/- 30,000 years
type Relative_Time is new Interfaces.Integer_64;
type Julian_Day_Number is new Interfaces.Integer_32;
type Zone_Record is record
From : Absolute_Time;
Offset : Relative_Time;
end record;
type Zone_Array is array (Positive range <>) of Zone_Record;
type Internal_Time_Zone (Length : Natural) is record
Data : Zone_Array (1 .. Length);
end record;
type Time_Zone_Access is access all Internal_Time_Zone;
for Time_Zone_Access'Storage_Size use 0;
UTC_Time_Zone : aliased Internal_Time_Zone (0);
end Matreshka.Internals.Calendars;