gcc/ada/libgnat/s-wchcon.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . W C H _ C O N                        --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2005-2018, 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 3,  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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 pragma Compiler_Unit_Warning;
  33
  34 package body System.WCh_Con is
  35
  36    ----------------------------
  37    -- Get_WC_Encoding_Method --
  38    ----------------------------
  39
  40    function Get_WC_Encoding_Method (C : Character) return WC_Encoding_Method is
  41    begin
  42       for Method in WC_Encoding_Method loop
  43          if C = WC_Encoding_Letters (Method) then
  44             return Method;
  45          end if;
  46       end loop;
  47
  48       raise Constraint_Error;
  49    end Get_WC_Encoding_Method;
  50
  51    function Get_WC_Encoding_Method (S : String) return WC_Encoding_Method is
  52    begin
  53       if    S = "hex"       then
  54          return WCEM_Hex;
  55       elsif S = "upper"     then
  56          return WCEM_Upper;
  57       elsif S = "shift_jis" then
  58          return WCEM_Shift_JIS;
  59       elsif S = "euc"       then
  60          return WCEM_EUC;
  61       elsif S = "utf8"      then
  62          return WCEM_UTF8;
  63       elsif S = "brackets"  then
  64          return WCEM_Brackets;
  65       else
  66          raise Constraint_Error;
  67       end if;
  68    end Get_WC_Encoding_Method;
  69
  70    --------------------------
  71    -- Is_Start_Of_Encoding --
  72    --------------------------
  73
  74    function Is_Start_Of_Encoding
  75      (C  : Character;
  76       EM : WC_Encoding_Method) return Boolean
  77    is
  78    begin
  79       return (EM in WC_Upper_Half_Encoding_Method
  80                and then Character'Pos (C) >= 16#80#)
  81         or else (EM in WC_ESC_Encoding_Method and then C = ASCII.ESC);
  82    end Is_Start_Of_Encoding;
  83
  84 end System.WCh_Con;