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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . W C H _ C N V --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2005 Free Software Foundation, Inc. --
-- --
-- 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. --
-- --
------------------------------------------------------------------------------
-- This unit may be used directly from an application program by providing
-- an appropriate WITH, and the interface can be expected to remain stable.
with System.WCh_Con;
package System.WCh_Cnv is
pragma Pure (WCh_Cnv);
type UTF_32_Code is range 0 .. 16#7FFF_FFFF#;
for UTF_32_Code'Size use 32;
-- Range of allowed UTF-32 encoding values
generic
with function In_Char return Character;
function Char_Sequence_To_Wide_Char
(C : Character;
EM : System.WCh_Con.WC_Encoding_Method) return Wide_Character;
-- C is the first character of a sequence of one or more characters which
-- represent a wide character sequence. Calling the function In_Char for
-- additional characters as required, Char_To_Wide_Char returns the
-- corresponding wide character value. Constraint_Error is raised if the
-- sequence of characters encountered is not a valid wide character
-- sequence for the given encoding method.
generic
with function In_Char return Character;
function Char_Sequence_To_UTF_32
(C : Character;
EM : System.WCh_Con.WC_Encoding_Method) return UTF_32_Code;
-- This is similar to the above, but the function returns a code from
-- the full UTF_32 code set, which covers the full range of possible
-- values in Wide_Wide_Character. The result can be converted to
-- Wide_Wide_Character form using Wide_Wide_Character'Val.
generic
with procedure Out_Char (C : Character);
procedure Wide_Char_To_Char_Sequence
(WC : Wide_Character;
EM : System.WCh_Con.WC_Encoding_Method);
-- Given a wide character, converts it into a sequence of one or
-- more characters, calling the given Out_Char procedure for each.
-- Constraint_Error is raised if the given wide character value is
-- not a valid value for the given encoding method.
generic
with procedure Out_Char (C : Character);
procedure UTF_32_To_Char_Sequence
(Val : UTF_32_Code;
EM : System.WCh_Con.WC_Encoding_Method);
-- This is similar to the above, but the input value is a code from the
-- full UTF_32 code set, which covers the full range of possible values
-- in Wide_Wide_Character. To convert a Wide_Wide_Character value, the
-- caller can use Wide_Wide_Character'Pos in the call.
end System.WCh_Cnv;
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