------------------------------------------------------------------------------ -- -- -- GNAT RUNTIME COMPONENTS -- -- -- -- S Y S T E M . W W 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 Interfaces; use Interfaces; with System.WWd_Char; package body System.Wwd_WChar is ------------------------------------ -- Wide_Wide_Width_Wide_Character -- ------------------------------------ -- This is the case where we are talking about the Wide_Wide_Image of -- a Wide_Character, which is always the same character sequence as the -- Wide_Image of the same Wide_Character. function Wide_Wide_Width_Wide_Character (Lo, Hi : Wide_Character) return Natural is begin return Wide_Width_Wide_Character (Lo, Hi); end Wide_Wide_Width_Wide_Character; ------------------------------------ -- Wide_Wide_Width_Wide_Wide_Char -- ------------------------------------ function Wide_Wide_Width_Wide_Wide_Char (Lo, Hi : Wide_Wide_Character) return Natural is W : Natural := 0; LV : constant Unsigned_32 := Wide_Wide_Character'Pos (Lo); HV : constant Unsigned_32 := Wide_Wide_Character'Pos (Hi); begin -- Return zero if empty range if LV > HV then return 0; end if; -- If any characters in normal character range, then use normal -- Wide_Wide_Width attribute on this range to find out a starting point. -- Otherwise start with zero. if LV <= 255 then W := System.WWd_Char.Wide_Wide_Width_Character (Lo => Character'Val (LV), Hi => Character'Val (Unsigned_32'Min (255, HV))); else W := 0; end if; -- Increase to at least 4 if FFFE or FFFF present. These correspond -- to the special language defined names FFFE/FFFF for these values. if 16#FFFF# in LV .. HV or else 16#FFFE# in LV .. HV then W := Natural'Max (W, 4); end if; -- Increase to at least 3 if any wide characters, corresponding to -- the normal ' character ' sequence. We know that the character fits. if HV > 255 then W := Natural'Max (W, 3); end if; return W; end Wide_Wide_Width_Wide_Wide_Char; ------------------------------- -- Wide_Width_Wide_Character -- ------------------------------- function Wide_Width_Wide_Character (Lo, Hi : Wide_Character) return Natural is W : Natural := 0; LV : constant Unsigned_32 := Wide_Character'Pos (Lo); HV : constant Unsigned_32 := Wide_Character'Pos (Hi); begin -- Return zero if empty range if LV > HV then return 0; end if; -- If any characters in normal character range, then use normal -- Wide_Wide_Width attribute on this range to find out a starting point. -- Otherwise start with zero. if LV <= 255 then W := System.WWd_Char.Wide_Width_Character (Lo => Character'Val (LV), Hi => Character'Val (Unsigned_32'Min (255, HV))); else W := 0; end if; -- Increase to at least 4 if FFFE or FFFF present. These correspond -- to the special language defined names FFFE/FFFF for these values. if 16#FFFF# in LV .. HV or else 16#FFFE# in LV .. HV then W := Natural'Max (W, 4); end if; -- Increase to at least 3 if any wide characters, corresponding to -- the normal 'character' sequence. We know that the character fits. if HV > 255 then W := Natural'Max (W, 3); end if; return W; end Wide_Width_Wide_Character; ------------------------------------ -- Wide_Width_Wide_Wide_Character -- ------------------------------------ -- This is a nasty case, because we get into the business of representing -- out of range wide wide characters as wide strings. Let's let image do -- the work here. Too bad if this takes lots of time. It's silly anyway! function Wide_Width_Wide_Wide_Character (Lo, Hi : Wide_Wide_Character) return Natural is W : Natural; begin W := 0; for J in Lo .. Hi loop declare S : constant Wide_String := Wide_Wide_Character'Wide_Image (J); begin W := Natural'Max (W, S'Length); end; end loop; return W; end Wide_Width_Wide_Wide_Character; end System.Wwd_WChar;