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------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . W I D _ W C H A R --
-- --
-- B o d y --
-- --
-- --
-- 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. --
-- 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;
end System.Wid_WChar;
|
