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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) 1992-2005, 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;