165 lines
6.9 KiB
Ada
165 lines
6.9 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUNTIME COMPONENTS --
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-- --
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-- S Y S T E M . W C H _ W T S --
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-- --
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-- B o d y --
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-- --
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-- --
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-- Copyright (C) 1992-2000 Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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with Interfaces; use Interfaces;
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with System.WCh_Con; use System.WCh_Con;
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with System.WCh_JIS; use System.WCh_JIS;
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package body System.WCh_WtS is
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---------------------------
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-- Wide_String_To_String --
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---------------------------
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function Wide_String_To_String
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(S : Wide_String;
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EM : WC_Encoding_Method)
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return String
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is
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R : String (1 .. 5 * S'Length); -- worst case length!
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RP : Natural;
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C1 : Character;
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C2 : Character;
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begin
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RP := 0;
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for SP in S'Range loop
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declare
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C : constant Wide_Character := S (SP);
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CV : constant Unsigned_16 := Wide_Character'Pos (C);
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Hex : constant array (Unsigned_16 range 0 .. 15) of Character :=
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"0123456789ABCDEF";
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begin
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if CV <= 127 then
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RP := RP + 1;
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R (RP) := Character'Val (CV);
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else
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case EM is
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-- Hex ESC sequence encoding
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when WCEM_Hex =>
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if CV <= 16#FF# then
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RP := RP + 1;
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R (RP) := Character'Val (CV);
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else
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R (RP + 1) := ASCII.ESC;
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R (RP + 2) := Hex (Shift_Right (CV, 12));
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R (RP + 3) := Hex (Shift_Right (CV, 8) and 16#000F#);
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R (RP + 4) := Hex (Shift_Right (CV, 4) and 16#000F#);
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R (RP + 5) := Hex (CV and 16#000F#);
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RP := RP + 5;
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end if;
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-- Upper bit shift (internal code = external code)
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when WCEM_Upper =>
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R (RP + 1) := Character'Val (Shift_Right (CV, 8));
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R (RP + 2) := Character'Val (CV and 16#FF#);
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RP := RP + 2;
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-- Upper bit shift (EUC)
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when WCEM_EUC =>
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JIS_To_EUC (C, C1, C2);
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R (RP + 1) := C1;
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R (RP + 2) := C2;
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RP := RP + 2;
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-- Upper bit shift (Shift-JIS)
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when WCEM_Shift_JIS =>
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JIS_To_Shift_JIS (C, C1, C2);
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R (RP + 1) := C1;
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R (RP + 2) := C2;
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RP := RP + 2;
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-- Upper bit shift (UTF-8)
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-- 16#0080#-16#07ff#: 2#110xxxxx# 2#10xxxxxx#
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-- 16#0800#-16#ffff#: 2#1110xxxx# 2#10xxxxxx# 2#10xxxxxx#
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when WCEM_UTF8 =>
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if CV < 16#0800# then
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R (RP + 1) :=
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Character'Val (2#11000000# or Shift_Right (CV, 6));
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R (RP + 2) :=
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Character'Val (2#10000000# or (CV and 2#00111111#));
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RP := RP + 2;
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else
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R (RP + 1) :=
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Character'Val (2#11100000# or Shift_Right (CV, 12));
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R (RP + 2) :=
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Character'Val (2#10000000# or
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(Shift_Right (CV, 6) and
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2#00111111#));
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R (RP + 3) :=
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Character'Val (2#10000000# or (CV and 2#00111111#));
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RP := RP + 3;
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end if;
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-- Brackets encoding
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when WCEM_Brackets =>
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if CV <= 16#FF# then
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RP := RP + 1;
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R (RP) := Character'Val (CV);
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else
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R (RP + 1) := '[';
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R (RP + 2) := '"';
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R (RP + 3) := Hex (Shift_Right (CV, 12));
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R (RP + 4) := Hex (Shift_Right (CV, 8) and 16#000F#);
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R (RP + 5) := Hex (Shift_Right (CV, 4) and 16#000F#);
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R (RP + 6) := Hex (CV and 16#000F#);
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R (RP + 7) := '"';
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R (RP + 8) := ']';
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RP := RP + 8;
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end if;
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end case;
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end if;
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end;
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end loop;
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return R (1 .. RP);
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end Wide_String_To_String;
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end System.WCh_WtS;
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