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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . W C H _ S T W --
-- --
-- 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 System.WCh_Con; use System.WCh_Con;
with System.WCh_Cnv; use System.WCh_Cnv;
package body System.WCh_StW is
-----------------------
-- Local Subprograms --
-----------------------
procedure Get_Next_Code
(S : String;
P : in out Natural;
V : out UTF_32_Code;
EM : WC_Encoding_Method);
-- Scans next character starting at S(P) and returns its value in V. On
-- exit P is updated past the last character read. Raises Constraint_Error
-- if the string is not well formed. Raises Constraint_Error if the code
-- value is greater than 16#7FFF_FFFF#. On entry P <= S'Last.
-------------------
-- Get_Next_Code --
-------------------
procedure Get_Next_Code
(S : String;
P : in out Natural;
V : out UTF_32_Code;
EM : WC_Encoding_Method)
is
function In_Char return Character;
-- Function to return a character, bumping P, raises Constraint_Error
-- if P > S'Last on entry.
function Get_UTF_32 is new Char_Sequence_To_UTF_32 (In_Char);
-- Function to get next UFT_32 value.
-------------
-- In_Char --
-------------
function In_Char return Character is
begin
if P > S'Last then
raise Constraint_Error;
else
P := P + 1;
return S (P - 1);
end if;
end In_Char;
begin
-- Check for wide character encoding
case EM is
when WCEM_Hex =>
if S (P) = ASCII.ESC then
V := Get_UTF_32 (In_Char, EM);
return;
end if;
when WCEM_Upper | WCEM_Shift_JIS | WCEM_EUC | WCEM_UTF8 =>
if S (P) >= Character'Val (16#80#) then
V := Get_UTF_32 (In_Char, EM);
return;
end if;
when WCEM_Brackets =>
if P + 2 <= S'Last
and then S (P) = '['
and then S (P + 1) = '"'
and then S (P + 2) /= '"'
then
V := Get_UTF_32 (In_Char, EM);
return;
end if;
end case;
-- If it is not a wide character code, just get it
V := Character'Pos (S (P));
P := P + 1;
end Get_Next_Code;
---------------------------
-- String_To_Wide_String --
---------------------------
function String_To_Wide_String
(S : String;
EM : WC_Encoding_Method) return Wide_String
is
R : Wide_String (1 .. S'Length);
RP : Natural;
SP : Natural;
V : UTF_32_Code;
begin
SP := S'First;
RP := 0;
while SP <= S'Last loop
Get_Next_Code (S, SP, V, EM);
if V > 16#FFFF# then
raise Constraint_Error;
end if;
RP := RP + 1;
R (RP) := Wide_Character'Val (V);
end loop;
return R (1 .. RP);
end String_To_Wide_String;
--------------------------------
-- String_To_Wide_Wide_String --
--------------------------------
function String_To_Wide_Wide_String
(S : String;
EM : WC_Encoding_Method) return Wide_Wide_String
is
R : Wide_Wide_String (1 .. S'Length);
RP : Natural;
SP : Natural;
V : UTF_32_Code;
begin
SP := S'First;
RP := 0;
while SP <= S'Last loop
Get_Next_Code (S, SP, V, EM);
RP := RP + 1;
R (RP) := Wide_Wide_Character'Val (V);
end loop;
return R (1 .. RP);
end String_To_Wide_Wide_String;
end System.WCh_StW;
|
