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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [s-valwch.adb] - Blame information for rev 706

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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                     S Y S T E M . V A L _ W C H A R                      --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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with Interfaces;      use Interfaces;
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with System.Val_Util; use System.Val_Util;
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with System.WCh_Cnv;  use System.WCh_Cnv;
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with System.WCh_Con;  use System.WCh_Con;
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package body System.Val_WChar is
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   --------------------------
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   -- Value_Wide_Character --
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   --------------------------
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   function Value_Wide_Character
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     (Str : String;
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      EM  : System.WCh_Con.WC_Encoding_Method) return Wide_Character
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   is
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      WC : constant Wide_Wide_Character := Value_Wide_Wide_Character (Str, EM);
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      WV : constant Unsigned_32         := Wide_Wide_Character'Pos (WC);
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   begin
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      if WV > 16#FFFF# then
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         raise Constraint_Error with
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           "out of range character for Value attribute";
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      else
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         return Wide_Character'Val (WV);
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      end if;
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   end Value_Wide_Character;
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   -------------------------------
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   -- Value_Wide_Wide_Character --
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   -------------------------------
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   function Value_Wide_Wide_Character
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     (Str : String;
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      EM  : System.WCh_Con.WC_Encoding_Method) return Wide_Wide_Character
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   is
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      F : Natural;
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      L : Natural;
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      S : String (Str'Range) := Str;
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   begin
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      Normalize_String (S, F, L);
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      --  Character literal case
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      if S (F) = ''' and then S (L) = ''' then
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         --  Must be at least three characters
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         if L - F < 2 then
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            raise Constraint_Error;
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         --  If just three characters, simple character case
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         elsif L - F = 2 then
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            return Wide_Wide_Character'Val (Character'Pos (S (F + 1)));
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         --  Only other possibility for quoted string is wide char sequence
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         else
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            declare
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               P : Natural;
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               W : Wide_Wide_Character;
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               function In_Char return Character;
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               --  Function for instantiations of Char_Sequence_To_UTF_32
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               -------------
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               -- In_Char --
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               -------------
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               function In_Char return Character is
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               begin
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                  P := P + 1;
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                  if P = Str'Last then
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                     raise Constraint_Error;
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                  end if;
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                  return Str (P);
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               end In_Char;
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               function UTF_32 is
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                 new Char_Sequence_To_UTF_32 (In_Char);
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            begin
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               P := F + 1;
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               --  Brackets encoding
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               if S (F + 1) = '[' then
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                  W := Wide_Wide_Character'Val (UTF_32 ('[', WCEM_Brackets));
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               else
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                  W := Wide_Wide_Character'Val (UTF_32 (S (F + 1), EM));
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               end if;
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               if P /= L - 1 then
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                  raise Constraint_Error;
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               end if;
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               return W;
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            end;
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         end if;
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      --  Deal with Hex_hhhhhhhh cases for wide_[wide_]character cases
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      elsif Str'Length = 12
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        and then Str (Str'First .. Str'First + 3) = "Hex_"
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      then
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         declare
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            W : Unsigned_32 := 0;
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         begin
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            for J in Str'First + 4 .. Str'First + 11 loop
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               W := W * 16 + Character'Pos (Str (J));
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               if Str (J) in '0' .. '9' then
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                  W := W - Character'Pos ('0');
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               elsif Str (J) in 'A' .. 'F' then
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                  W := W - Character'Pos ('A') + 10;
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               elsif Str (J) in 'a' .. 'f' then
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                  W := W - Character'Pos ('a') + 10;
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               else
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                  raise Constraint_Error;
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               end if;
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            end loop;
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            if W > 16#7FFF_FFFF# then
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               raise Constraint_Error;
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            else
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               return Wide_Wide_Character'Val (W);
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            end if;
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         end;
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      --  Otherwise must be one of the special names for Character
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      else
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         return
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           Wide_Wide_Character'Val (Character'Pos (Character'Value (Str)));
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      end if;
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   exception
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      when Constraint_Error =>
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         raise Constraint_Error with "invalid string for value attribute";
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   end Value_Wide_Wide_Character;
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end System.Val_WChar;

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