New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45957 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 114 insertions, 0 deletions

diff --git a/gcc/ada/s-valwch.adb b/gcc/ada/s-valwch.adb
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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                     S Y S T E M . V A L _ W C H A R                      --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--                            $Revision: 1.2 $                              --
+--                                                                          --
+--          Copyright (C) 1992-1997, Free Software Foundation, Inc.         --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
+-- for  more details.  You should have  received  a copy of the GNU General --
+-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
+-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
+-- MA 02111-1307, USA.                                                      --
+--                                                                          --
+-- As a special exception,  if other files  instantiate  generics from this --
+-- unit, or you link  this unit with other files  to produce an executable, --
+-- this  unit  does not  by itself cause  the resulting  executable  to  be --
+-- covered  by the  GNU  General  Public  License.  This exception does not --
+-- however invalidate  any other reasons why  the executable file  might be --
+-- covered by the  GNU Public License.                                      --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with System.Val_Util; use System.Val_Util;
+with System.WCh_Con;  use System.WCh_Con;
+with System.WCh_StW;  use System.WCh_StW;
+
+package body System.Val_WChar is
+
+   --------------------------
+   -- Value_Wide_Character --
+   --------------------------
+
+   function Value_Wide_Character
+      (Str  : String;
+       EM   : WC_Encoding_Method)
+       return Wide_Character
+   is
+      F : Natural;
+      L : Natural;
+      S : String (Str'Range) := Str;
+
+   begin
+      Normalize_String (S, F, L);
+
+      --  Character literal case
+
+      if S (F) = ''' and then S (L) = ''' then
+
+         --  If just three characters, simple character case
+
+         if L - F = 2 then
+            return Wide_Character'Val (Character'Pos (S (F + 1)));
+
+         --  Otherwise must be a wide character in quotes. The easiest
+         --  thing is to convert the string to a wide string and then
+         --  pick up the single character that it should contain.
+
+         else
+            declare
+               WS : constant Wide_String :=
+                      String_To_Wide_String (S (F + 1 .. L - 1), EM);
+
+            begin
+               if WS'Length /= 1 then
+                  raise Constraint_Error;
+
+               else
+                  return WS (WS'First);
+               end if;
+            end;
+         end if;
+
+      --  the last two values of the type have language-defined names:
+
+      elsif S = "FFFE" then
+         return Wide_Character'Val (16#FFFE#);
+
+      elsif S = "FFFF" then
+         return Wide_Character'Val (16#FFFF#);
+
+      --  Otherwise must be a control character
+
+      else
+         for C in Character'Val (16#00#) .. Character'Val (16#1F#) loop
+            if S (F .. L) = Character'Image (C) then
+               return Wide_Character'Val (Character'Pos (C));
+            end if;
+         end loop;
+
+         for C in Character'Val (16#7F#) .. Character'Val (16#9F#) loop
+            if S (F .. L) = Character'Image (C) then
+               return Wide_Character'Val (Character'Pos (C));
+            end if;
+         end loop;
+
+         raise Constraint_Error;
+      end if;
+
+   end Value_Wide_Character;
+
+end System.Val_WChar;