gcc/ada/a-suewen.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                  ADA.STRINGS.UTF_ENCODING.WIDE_ENCODING                  --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 -- This specification is derived from the Ada Reference Manual for use with --
  10 -- GNAT.  In accordance with the copyright of that document, you can freely --
  11 -- copy and modify this specification,  provided that if you redistribute a --
  12 -- modified version,  any changes that you have made are clearly indicated. --
  13 --                                                                          --
  14 ------------------------------------------------------------------------------
  15
  16 --  This is an Ada 2012 package defined in AI05-0137-1. It is used for encoding
  17 --  and decoding Wide_String values using UTF encodings. Note: this package is
  18 --  consistent with Ada 95, and may be included in Ada 95 implementations.
  19
  20 package Ada.Strings.UTF_Encoding.Wide_Encoding is
  21    pragma Pure (Wide_Encoding);
  22
  23    --  The encoding routines take a Wide_String as input and encode the result
  24    --  using the specified UTF encoding method. The result includes a BOM if
  25    --  the Output_BOM argument is set to True. Encoding_Error is raised if an
  26    --  invalid character appears in the input. In particular the characters
  27    --  in the range 16#D800# .. 16#DFFF# are invalid because they conflict
  28    --  with UTF-16 surrogate encodings, and the characters 16#FFFE# and
  29    --  16#FFFF# are also invalid because they conflict with BOM codes.
  30
  31    function Encode
  32      (Item          : Wide_String;
  33       Output_Scheme : Encoding_Scheme;
  34       Output_BOM    : Boolean  := False) return UTF_String;
  35    --  Encode Wide_String using UTF-8, UTF-16LE or UTF-16BE encoding as
  36    --  specified by the Output_Scheme parameter.
  37
  38    function Encode
  39      (Item       : Wide_String;
  40       Output_BOM : Boolean  := False) return UTF_8_String;
  41    --  Encode Wide_String using UTF-8 encoding
  42
  43    function Encode
  44      (Item       : Wide_String;
  45       Output_BOM : Boolean  := False) return UTF_16_Wide_String;
  46    --  Encode Wide_String using UTF_16 encoding
  47
  48    --  The decoding routines take a UTF String as input, and return a decoded
  49    --  Wide_String. If the UTF String starts with a BOM that matches the
  50    --  encoding method, it is ignored. An incorrect BOM raises Encoding_Error.
  51
  52    function Decode
  53      (Item         : UTF_String;
  54       Input_Scheme : Encoding_Scheme) return Wide_String;
  55    --  The input is encoded in UTF_8, UTF_16LE or UTF_16BE as specified by the
  56    --  Input_Scheme parameter. It is decoded and returned as a Wide_String
  57    --  value. Note: a convenient form for scheme may be Encoding (UTF_String).
  58
  59    function Decode
  60      (Item : UTF_8_String) return Wide_String;
  61    --  The input is encoded in UTF-8 and returned as a Wide_String value
  62
  63    function Decode
  64      (Item : UTF_16_Wide_String) return Wide_String;
  65    --  The input is encoded in UTF-16 and returned as a Wide_String value
  66
  67 end Ada.Strings.UTF_Encoding.Wide_Encoding;