------------------------------------------------------------------------------ -- -- -- GNAT RUNTIME COMPONENTS -- -- -- -- S Y S T E M . W I D _ 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, 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.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; ------------------------------- -- Width_Wide_Wide_Character -- ------------------------------- function Width_Wide_Wide_Character (Lo, Hi : Wide_Wide_Character; EM : WC_Encoding_Method) return Natural is W : Natural; P : Natural; begin W := 0; for C in Lo .. Hi loop P := Wide_Wide_Character'Pos (C); -- Here if we find a character in wide 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_Wide_Character'Val (16#FFFF#) then return Natural'Max (W, 4); elsif Hi > Wide_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, 10); 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_Wide_Character; end System.Wid_WChar;