| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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; |
