+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S Y S T E M . V A L _ W C H A R --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.2 $
--- --
--- 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. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
-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;