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73 lines
3.4 KiB
Ada
73 lines
3.4 KiB
Ada
------------------------------------------------------------------------------
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-- XML/Ada - An XML suite for Ada95 --
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-- --
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-- Copyright (C) 2001-2017, AdaCore --
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-- --
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-- This library is free software; you can redistribute it and/or modify it --
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-- under terms of the GNU General Public License as published by the Free --
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-- Software Foundation; either version 3, or (at your option) any later --
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-- version. This library is distributed in the hope that it will be useful, --
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
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-- TABILITY 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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------------------------------------------------------------------------------
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-- This is the root of the hierarchy that provides coded character sets.
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-- These CCS can be used to convert from any encoding (like Iso/Latin-1)
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-- to Unicode.
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-- See http://www.isoc.org:8080/codage/iso8859/jeuxiso.en.htm for a list
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-- of the ISO 8859-* character sets
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-- ??? URL above is invalid
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package Unicode.CCS is
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-- Each of the child package shall have two public functions with
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-- the following profile:
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-- function Convert (Char : Unicode_Char) return Unicode_Char
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-- that converts from a code point representing an abstract character in
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-- the specific encoding to the code point for the same character in
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-- Unicode, or reverse.
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-- ??? This is not consistent with the specification of type Unicode_Char,
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-- which states that values of Unicode_Char always are code points in
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-- the Unicode repertoire.
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type Conversion_Function is access
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function (Char : Unicode_Char) return Unicode_Char;
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type Character_Set is record
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To_Unicode : Conversion_Function;
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To_CS : Conversion_Function;
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end record;
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--------------------
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-- Character sets --
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--------------------
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function Identity (Char : Unicode_Char) return Unicode_Char;
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-- return its parameter directly.
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Unicode_Character_Set : constant Character_Set :=
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(To_Unicode => Identity'Access,
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To_CS => Identity'Access);
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Invalid_Code : exception;
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-- Exception raised when trying to convert to a code point that
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-- is not available in the specific character set. This can never be
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-- raised when converting to Unicode, since it is universal by definition.
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Unknown_Character_Set : exception;
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-- Raised by Get_Conversion or Get_Revert_Conversion when the name is
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-- unknown.
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end Unicode.CCS;
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