------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S Y S T E M . V A L _ W C H A R -- -- -- -- B o d y -- -- -- -- -- -- 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;