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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- W I D E C H A R --
-- --
-- B o d y --
-- --
-- --
-- Copyright (C) 1992-2001 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. --
-- --
------------------------------------------------------------------------------
-- Note: this package uses the generic subprograms in System.Wch_Cnv, which
-- completely encapsulate the set of wide character encoding methods, so no
-- modifications are required when adding new encoding methods.
with Opt; use Opt;
with System.WCh_Cnv; use System.WCh_Cnv;
with System.WCh_Con; use System.WCh_Con;
package body Widechar is
---------------------------
-- Is_Start_Of_Wide_Char --
---------------------------
function Is_Start_Of_Wide_Char
(S : Source_Buffer_Ptr;
P : Source_Ptr)
return Boolean
is
begin
case Wide_Character_Encoding_Method is
when WCEM_Hex =>
return S (P) = ASCII.ESC;
when WCEM_Upper |
WCEM_Shift_JIS |
WCEM_EUC |
WCEM_UTF8 =>
return S (P) >= Character'Val (16#80#);
when WCEM_Brackets =>
return P <= S'Last - 2
and then S (P) = '['
and then S (P + 1) = '"'
and then S (P + 2) /= '"';
end case;
end Is_Start_Of_Wide_Char;
-----------------
-- Length_Wide --
-----------------
function Length_Wide return Nat is
begin
return WC_Longest_Sequence;
end Length_Wide;
---------------
-- Scan_Wide --
---------------
procedure Scan_Wide
(S : Source_Buffer_Ptr;
P : in out Source_Ptr;
C : out Char_Code;
Err : out Boolean)
is
function In_Char return Character;
-- Function to obtain characters of wide character escape sequence
function In_Char return Character is
begin
P := P + 1;
return S (P - 1);
end In_Char;
function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
begin
C := Char_Code (Wide_Character'Pos
(WC_In (In_Char, Wide_Character_Encoding_Method)));
Err := False;
exception
when Constraint_Error =>
C := Char_Code (0);
P := P - 1;
Err := True;
end Scan_Wide;
--------------
-- Set_Wide --
--------------
procedure Set_Wide
(C : Char_Code;
S : in out String;
P : in out Natural)
is
procedure Out_Char (C : Character);
-- Procedure to store one character of wide character sequence
procedure Out_Char (C : Character) is
begin
P := P + 1;
S (P) := C;
end Out_Char;
procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char);
begin
WC_Out (Wide_Character'Val (C), Wide_Character_Encoding_Method);
end Set_Wide;
---------------
-- Skip_Wide --
---------------
procedure Skip_Wide (S : String; P : in out Natural) is
function Skip_Char return Character;
-- Function to skip one character of wide character escape sequence
function Skip_Char return Character is
begin
P := P + 1;
return S (P - 1);
end Skip_Char;
function WC_Skip is new Char_Sequence_To_Wide_Char (Skip_Char);
Discard : Wide_Character;
begin
Discard := WC_Skip (Skip_Char, Wide_Character_Encoding_Method);
end Skip_Wide;
end Widechar;
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