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------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . W C H _ W T S --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2000 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.WCh_Con; use System.WCh_Con;
with System.WCh_JIS; use System.WCh_JIS;
package body System.WCh_WtS is
---------------------------
-- Wide_String_To_String --
---------------------------
function Wide_String_To_String
(S : Wide_String;
EM : WC_Encoding_Method)
return String
is
R : String (1 .. 5 * S'Length); -- worst case length!
RP : Natural;
C1 : Character;
C2 : Character;
begin
RP := 0;
for SP in S'Range loop
declare
C : constant Wide_Character := S (SP);
CV : constant Unsigned_16 := Wide_Character'Pos (C);
Hex : constant array (Unsigned_16 range 0 .. 15) of Character :=
"0123456789ABCDEF";
begin
if CV <= 127 then
RP := RP + 1;
R (RP) := Character'Val (CV);
else
case EM is
-- Hex ESC sequence encoding
when WCEM_Hex =>
if CV <= 16#FF# then
RP := RP + 1;
R (RP) := Character'Val (CV);
else
R (RP + 1) := ASCII.ESC;
R (RP + 2) := Hex (Shift_Right (CV, 12));
R (RP + 3) := Hex (Shift_Right (CV, 8) and 16#000F#);
R (RP + 4) := Hex (Shift_Right (CV, 4) and 16#000F#);
R (RP + 5) := Hex (CV and 16#000F#);
RP := RP + 5;
end if;
-- Upper bit shift (internal code = external code)
when WCEM_Upper =>
R (RP + 1) := Character'Val (Shift_Right (CV, 8));
R (RP + 2) := Character'Val (CV and 16#FF#);
RP := RP + 2;
-- Upper bit shift (EUC)
when WCEM_EUC =>
JIS_To_EUC (C, C1, C2);
R (RP + 1) := C1;
R (RP + 2) := C2;
RP := RP + 2;
-- Upper bit shift (Shift-JIS)
when WCEM_Shift_JIS =>
JIS_To_Shift_JIS (C, C1, C2);
R (RP + 1) := C1;
R (RP + 2) := C2;
RP := RP + 2;
-- Upper bit shift (UTF-8)
-- 16#0080#-16#07ff#: 2#110xxxxx# 2#10xxxxxx#
-- 16#0800#-16#ffff#: 2#1110xxxx# 2#10xxxxxx# 2#10xxxxxx#
when WCEM_UTF8 =>
if CV < 16#0800# then
R (RP + 1) :=
Character'Val (2#11000000# or Shift_Right (CV, 6));
R (RP + 2) :=
Character'Val (2#10000000# or (CV and 2#00111111#));
RP := RP + 2;
else
R (RP + 1) :=
Character'Val (2#11100000# or Shift_Right (CV, 12));
R (RP + 2) :=
Character'Val (2#10000000# or
(Shift_Right (CV, 6) and
2#00111111#));
R (RP + 3) :=
Character'Val (2#10000000# or (CV and 2#00111111#));
RP := RP + 3;
end if;
-- Brackets encoding
when WCEM_Brackets =>
if CV <= 16#FF# then
RP := RP + 1;
R (RP) := Character'Val (CV);
else
R (RP + 1) := '[';
R (RP + 2) := '"';
R (RP + 3) := Hex (Shift_Right (CV, 12));
R (RP + 4) := Hex (Shift_Right (CV, 8) and 16#000F#);
R (RP + 5) := Hex (Shift_Right (CV, 4) and 16#000F#);
R (RP + 6) := Hex (CV and 16#000F#);
R (RP + 7) := '"';
R (RP + 8) := ']';
RP := RP + 8;
end if;
end case;
end if;
end;
end loop;
return R (1 .. RP);
end Wide_String_To_String;
end System.WCh_WtS;
|
