| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUNTIME COMPONENTS -- |
| -- -- |
| -- S Y S T E M . W I D _ W C H A R -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- $Revision: 1.10 $ -- |
| -- -- |
| -- Copyright (C) 1992-1998 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.WCh_Con; use System.WCh_Con; |
| |
| package body System.Wid_WChar is |
| |
| -------------------------- |
| -- Width_Wide_Character -- |
| -------------------------- |
| |
| function Width_Wide_Character |
| (Lo, Hi : Wide_Character; |
| EM : WC_Encoding_Method) |
| return Natural |
| is |
| W : Natural; |
| P : Natural; |
| |
| begin |
| W := 0; |
| |
| for C in Lo .. Hi loop |
| P := Wide_Character'Pos (C); |
| |
| -- Here if we find a character in wide character range |
| |
| if P > 16#FF# then |
| |
| case EM is |
| |
| when WCEM_Hex => |
| return Natural'Max (W, 5); |
| |
| when WCEM_Upper => |
| return Natural'Max (W, 2); |
| |
| when WCEM_Shift_JIS => |
| return Natural'Max (W, 2); |
| |
| when WCEM_EUC => |
| return Natural'Max (W, 2); |
| |
| when WCEM_UTF8 => |
| if Hi > Wide_Character'Val (16#07FF#) then |
| return Natural'Max (W, 3); |
| else |
| return Natural'Max (W, 2); |
| end if; |
| |
| when WCEM_Brackets => |
| return Natural'Max (W, 8); |
| |
| end case; |
| |
| -- If we are in character range then use length of character image |
| |
| else |
| declare |
| S : constant String := Character'Image (Character'Val (P)); |
| begin |
| W := Natural'Max (W, S'Length); |
| end; |
| end if; |
| end loop; |
| |
| return W; |
| end Width_Wide_Character; |
| |
| end System.Wid_WChar; |
