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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- W I D E C H A R --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1992-2006, 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, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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
+
+ -- For Hex mode, just test for an ESC character. The ESC character
+ -- cannot appear in any other context in a legal Ada program.
+
+ when WCEM_Hex =>
+ return S (P) = ASCII.ESC;
+
+ -- For brackets, just test ["x where x is a hex character. This is
+ -- sufficient test, since this sequence cannot otherwise appear in a
+ -- legal Ada program.
+
+ when WCEM_Brackets =>
+ return P <= S'Last - 2
+ and then S (P) = '['
+ and then S (P + 1) = '"'
+ and then (S (P + 2) in '0' .. '9'
+ or else
+ S (P + 2) in 'a' .. 'f'
+ or else
+ S (P + 2) in 'A' .. 'F');
+
+ -- All other encoding methods use the upper bit set in the first
+ -- character to uniquely represent a wide character.
+
+ when WCEM_Upper |
+ WCEM_Shift_JIS |
+ WCEM_EUC |
+ WCEM_UTF8 =>
+ return S (P) >= Character'Val (16#80#);
+ 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
+ P_Init : constant Source_Ptr := P;
+ Chr : Character;
+
+ function In_Char return Character;
+ -- Function to obtain characters of wide character escape sequence
+
+ -------------
+ -- In_Char --
+ -------------
+
+ 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_UTF_32 (In_Char);
+
+ -- Start of processingf for Scan_Wide
+
+ begin
+ Chr := In_Char;
+
+ -- Scan out the wide character. if the first character is a bracket,
+ -- we allow brackets encoding regardless of the standard encoding
+ -- method being used, but otherwise we use this standard method.
+
+ if Chr = '[' then
+ C := Char_Code (WC_In (Chr, WCEM_Brackets));
+ else
+ C := Char_Code (WC_In (Chr, Wide_Character_Encoding_Method));
+ end if;
+
+ Err := False;
+ Wide_Char_Byte_Count := Wide_Char_Byte_Count + Nat (P - P_Init - 1);
+
+ 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
+
+ --------------
+ -- Out_Char --
+ --------------
+
+ procedure Out_Char (C : Character) is
+ begin
+ P := P + 1;
+ S (P) := C;
+ end Out_Char;
+
+ procedure WC_Out is new UTF_32_To_Char_Sequence (Out_Char);
+
+ -- Start of processing for Set_Wide
+
+ begin
+ WC_Out (UTF_32_Code (C), Wide_Character_Encoding_Method);
+ end Set_Wide;
+
+ ---------------
+ -- Skip_Wide --
+ ---------------
+
+ procedure Skip_Wide (S : String; P : in out Natural) is
+ P_Init : constant Natural := P;
+
+ function Skip_Char return Character;
+ -- Function to skip one character of wide character escape sequence
+
+ ---------------
+ -- Skip_Char --
+ ---------------
+
+ 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_UTF_32 (Skip_Char);
+
+ Discard : UTF_32_Code;
+ pragma Warnings (Off, Discard);
+
+ -- Start of processing for Skip_Wide
+
+ begin
+ Discard := WC_Skip (Skip_Char, Wide_Character_Encoding_Method);
+ Wide_Char_Byte_Count := Wide_Char_Byte_Count + Nat (P - P_Init - 1);
+ end Skip_Wide;
+
+ ---------------
+ -- Skip_Wide --
+ ---------------
+
+ procedure Skip_Wide (S : Source_Buffer_Ptr; P : in out Source_Ptr) is
+ P_Init : constant Source_Ptr := P;
+
+ function Skip_Char return Character;
+ -- Function to skip one character of wide character escape sequence
+
+ ---------------
+ -- Skip_Char --
+ ---------------
+
+ 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_UTF_32 (Skip_Char);
+
+ Discard : UTF_32_Code;
+ pragma Warnings (Off, Discard);
+
+ -- Start of processing for Skip_Wide
+
+ begin
+ Discard := WC_Skip (Skip_Char, Wide_Character_Encoding_Method);
+ Wide_Char_Byte_Count := Wide_Char_Byte_Count + Nat (P - P_Init - 1);
+ end Skip_Wide;
+
+end Widechar;