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