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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) 1992-2009, 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 3, 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. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- <http://www.gnu.org/licenses/>. -- -- -- -- 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 with "badly formed wide character code"; 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 -- --------------------------- procedure String_To_Wide_String (S : String; R : out Wide_String; L : out Natural; EM : System.WCh_Con.WC_Encoding_Method) is SP : Natural; V : UTF_32_Code; begin pragma Assert (S'First = 1); SP := S'First; L := 0; while SP <= S'Last loop Get_Next_Code (S, SP, V, EM); if V > 16#FFFF# then raise Constraint_Error with "out of range value for wide character"; end if; L := L + 1; R (L) := Wide_Character'Val (V); end loop; end String_To_Wide_String; -------------------------------- -- String_To_Wide_Wide_String -- -------------------------------- procedure String_To_Wide_Wide_String (S : String; R : out Wide_Wide_String; L : out Natural; EM : System.WCh_Con.WC_Encoding_Method) is pragma Assert (S'First = 1); SP : Natural; V : UTF_32_Code; begin SP := S'First; L := 0; while SP <= S'Last loop Get_Next_Code (S, SP, V, EM); L := L + 1; R (L) := Wide_Wide_Character'Val (V); end loop; end String_To_Wide_Wide_String; end System.WCh_StW;
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