------------------------------------------------------------------------------ -- -- -- 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, 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. -- -- -- ------------------------------------------------------------------------------ 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; -- Start of processing for Get_Next_Code 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;