164 lines
5.7 KiB
Ada
164 lines
5.7 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- W I D E C H A R --
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-- --
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-- B o d y --
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-- --
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-- $Revision: 1.15 $
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-- --
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-- Copyright (C) 1992-2001 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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-- Note: this package uses the generic subprograms in System.Wch_Cnv, which
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-- completely encapsulate the set of wide character encoding methods, so no
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-- modifications are required when adding new encoding methods.
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with Opt; use Opt;
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with System.WCh_Cnv; use System.WCh_Cnv;
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with System.WCh_Con; use System.WCh_Con;
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package body Widechar is
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---------------------------
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-- Is_Start_Of_Wide_Char --
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---------------------------
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function Is_Start_Of_Wide_Char
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(S : Source_Buffer_Ptr;
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P : Source_Ptr)
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return Boolean
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is
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begin
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case Wide_Character_Encoding_Method is
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when WCEM_Hex =>
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return S (P) = ASCII.ESC;
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when WCEM_Upper |
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WCEM_Shift_JIS |
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WCEM_EUC |
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WCEM_UTF8 =>
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return S (P) >= Character'Val (16#80#);
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when WCEM_Brackets =>
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return P <= S'Last - 2
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and then S (P) = '['
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and then S (P + 1) = '"'
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and then S (P + 2) /= '"';
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end case;
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end Is_Start_Of_Wide_Char;
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-----------------
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-- Length_Wide --
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-----------------
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function Length_Wide return Nat is
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begin
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return WC_Longest_Sequence;
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end Length_Wide;
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---------------
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-- Scan_Wide --
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---------------
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procedure Scan_Wide
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(S : Source_Buffer_Ptr;
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P : in out Source_Ptr;
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C : out Char_Code;
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Err : out Boolean)
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is
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function In_Char return Character;
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-- Function to obtain characters of wide character escape sequence
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function In_Char return Character is
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begin
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P := P + 1;
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return S (P - 1);
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end In_Char;
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function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
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begin
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C := Char_Code (Wide_Character'Pos
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(WC_In (In_Char, Wide_Character_Encoding_Method)));
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Err := False;
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exception
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when Constraint_Error =>
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C := Char_Code (0);
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P := P - 1;
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Err := True;
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end Scan_Wide;
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--------------
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-- Set_Wide --
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--------------
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procedure Set_Wide
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(C : Char_Code;
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S : in out String;
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P : in out Natural)
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is
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procedure Out_Char (C : Character);
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-- Procedure to store one character of wide character sequence
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procedure Out_Char (C : Character) is
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begin
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P := P + 1;
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S (P) := C;
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end Out_Char;
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procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char);
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begin
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WC_Out (Wide_Character'Val (C), Wide_Character_Encoding_Method);
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end Set_Wide;
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---------------
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-- Skip_Wide --
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---------------
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procedure Skip_Wide (S : String; P : in out Natural) is
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function Skip_Char return Character;
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-- Function to skip one character of wide character escape sequence
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function Skip_Char return Character is
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begin
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P := P + 1;
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return S (P - 1);
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end Skip_Char;
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function WC_Skip is new Char_Sequence_To_Wide_Char (Skip_Char);
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Discard : Wide_Character;
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begin
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Discard := WC_Skip (Skip_Char, Wide_Character_Encoding_Method);
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end Skip_Wide;
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end Widechar;
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