| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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; |
