Ada Programming/Libraries/Ada.Strings.UTF_Encoding

Computing » Computer Science » Computer Programming » Ada Programming

---

This language feature has been introduced in Ada 2012.

Ada.Strings.UTF_Encoding is a unit of the Predefined Language Environment since Ada 2012.

Specification

--                     Standard Ada library specification
--   Copyright (c) 2004-2016 AXE Consultants
--   Copyright (c) 2004, 2005, 2006 Ada-Europe
--   Copyright (c) 2000 The MITRE Corporation, Inc.
--   Copyright (c) 1992, 1993, 1994, 1995 Intermetrics, Inc.
--   SPDX-License-Identifier: BSD-3-Clause and LicenseRef-AdaReferenceManual
-- -------------------------------------------------------------------------

package Ada.Strings.UTF_Encoding is
   pragma Pure (UTF_Encoding);

   --  Declarations common to the string encoding packages
   type Encoding_Scheme is (UTF_8, UTF_16BE, UTF_16LE);

   subtype UTF_String is String;

   subtype UTF_8_String is String;

   subtype UTF_16_Wide_String is Wide_String;

   Encoding_Error : exception;

   BOM_8    : constant UTF_8_String :=
                Character'Val(16#EF#) &
                Character'Val(16#BB#) &
                Character'Val(16#BF#);

   BOM_16BE : constant UTF_String :=
                Character'Val(16#FE#) &
                Character'Val(16#FF#);

   BOM_16LE : constant UTF_String :=
                Character'Val(16#FF#) &
                Character'Val(16#FE#);

   BOM_16   : constant UTF_16_Wide_String :=
               (1 => Wide_Character'Val(16#FEFF#));

   function Encoding (Item    : UTF_String;
                      Default : Encoding_Scheme := UTF_8)
      return Encoding_Scheme;

end Ada.Strings.UTF_Encoding;

See also

Wikibook

• Ada Programming/Libraries/Ada
• Ada Programming/Libraries/Ada.Strings

External examples

• Search for examples of Ada.Strings.UTF_Encoding in: Rosetta Code, GitHub (gists), any Alire crate or this Wikibook.
• Search for posts related to Ada.Strings.UTF_Encoding in: Stack Overflow, comp.lang.ada or any Ada related page.

Ada Reference Manual

Ada 2012

• A.4.11: String Encoding ^[Annotated]

Open-Source Implementations

FSF GNAT

• Specification: a-stuten.ads
• Body: a-stuten.adb

drake

• Specification: strings/a-stuten.ads
• Body: strings/a-stuten.adb