------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S Y S T E M . V A L _ W C H A R -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2005, 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, 51 Franklin Street, Fifth Floor, -- -- Boston, MA 02110-1301, 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 Interfaces; use Interfaces; with System.Val_Util; use System.Val_Util; package body System.Val_WChar is -------------------------- -- Value_Wide_Character -- -------------------------- function Value_Wide_Character (Str : String) return Wide_Character is WWC : constant Wide_Wide_Character := Value_Wide_Wide_Character (Str); WWV : constant Unsigned_32 := Wide_Wide_Character'Pos (WWC); begin if WWV > 16#FFFF# then raise Constraint_Error with "out of range character for Value attribute"; else return Wide_Character'Val (WWV); end if; end Value_Wide_Character; ------------------------------- -- Value_Wide_Wide_Character -- ------------------------------- function Value_Wide_Wide_Character (Str : String) return Wide_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_Wide_Character'Val (Character'Pos (S (F + 1))); -- Otherwise something is very wrong else raise Constraint_Error with "invalid string for Value attribute"; end if; -- Deal with Hex_hhhhhhhh cases for wide_[wide_]character cases elsif Str'Length = 12 and then Str (1 .. 4) = "Hex_" then declare W : Unsigned_32 := 0; begin for J in 5 .. 12 loop W := W * 16 + Character'Pos (Str (J)); if Str (J) in '0' .. '9' then W := W - Character'Pos ('0'); elsif Str (J) in 'A' .. 'F' then W := W - Character'Pos ('A') + 10; elsif Str (J) in 'a' .. 'f' then W := W - Character'Pos ('a') + 10; else raise Constraint_Error with "illegal hex character for Value attribute"; end if; end loop; if W > 16#7FFF_FFFF# then raise Constraint_Error with "out of range value for Value attribute"; else return Wide_Wide_Character'Val (W); end if; end; -- Otherwise must be one of the special names for Character else return Wide_Wide_Character'Val (Character'Pos (Character'Value (Str))); end if; end Value_Wide_Wide_Character; end System.Val_WChar;