gcc/ada/s-wchwts.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . W C H _ W T S                        --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2005, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This package contains the routine used to convert wide strings and wide
  35 --  wide stringsto strings for use by wide and wide wide character attributes
  36 --  (value, image etc.) and also by the numeric IO subpackages of
  37 --  Ada.Text_IO.Wide_Text_IO and Ada.Text_IO.Wide_Wide_Text_IO.
  38
  39 with System.WCh_Con;
  40
  41 package System.WCh_WtS is
  42    pragma Pure;
  43
  44    function Wide_String_To_String
  45      (S  : Wide_String;
  46       EM : System.WCh_Con.WC_Encoding_Method) return String;
  47    --  This routine simply takes its argument and converts it to a string,
  48    --  using the internal compiler escape sequence convention (defined in
  49    --  package Widechar) to translate characters that are out of range
  50    --  of type String. In the context of the Wide_Value attribute, the
  51    --  argument is the original attribute argument, and the result is used
  52    --  in a call to the corresponding Value attribute function. If the method
  53    --  for encoding is a shift-in, shift-out convention, then it is assumed
  54    --  that normal (non-wide character) mode holds at the start and end of
  55    --  the result string. EM indicates the wide character encoding method.
  56    --  Note: in the WCEM_Brackets case, we only use the brackets encoding
  57    --  for characters greater than 16#FF#.
  58
  59    function Wide_Wide_String_To_String
  60      (S  : Wide_Wide_String;
  61       EM : System.WCh_Con.WC_Encoding_Method) return String;
  62    --  Same processing, except for Wide_Wide_String
  63
  64 end System.WCh_WtS;