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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [ada/] [s-wchstw.adb] - Blame information for rev 281

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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--                       S Y S T E M . W C H _ S T W                        --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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with System.WCh_Con; use System.WCh_Con;
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with System.WCh_Cnv; use System.WCh_Cnv;
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package body System.WCh_StW is
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   -----------------------
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   -- Local Subprograms --
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   -----------------------
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   procedure Get_Next_Code
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     (S  : String;
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      P  : in out Natural;
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      V  : out UTF_32_Code;
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      EM : WC_Encoding_Method);
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   --  Scans next character starting at S(P) and returns its value in V. On
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   --  exit P is updated past the last character read. Raises Constraint_Error
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   --  if the string is not well formed. Raises Constraint_Error if the code
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   --  value is greater than 16#7FFF_FFFF#. On entry P <= S'Last.
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   -------------------
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   -- Get_Next_Code --
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   -------------------
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   procedure Get_Next_Code
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     (S  : String;
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      P  : in out Natural;
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      V  : out UTF_32_Code;
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      EM : WC_Encoding_Method)
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   is
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      function In_Char return Character;
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      --  Function to return a character, bumping P, raises Constraint_Error
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      --  if P > S'Last on entry.
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      function Get_UTF_32 is new Char_Sequence_To_UTF_32 (In_Char);
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      --  Function to get next UFT_32 value
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      -------------
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      -- In_Char --
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      -------------
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      function In_Char return Character is
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      begin
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         if P > S'Last then
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            raise Constraint_Error with "badly formed wide character code";
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         else
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            P := P + 1;
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            return S (P - 1);
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         end if;
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      end In_Char;
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   --  Start of processing for Get_Next_Code
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   begin
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      --  Check for wide character encoding
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      case EM is
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         when WCEM_Hex =>
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            if S (P) = ASCII.ESC then
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               V := Get_UTF_32 (In_Char, EM);
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               return;
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            end if;
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         when WCEM_Upper | WCEM_Shift_JIS | WCEM_EUC | WCEM_UTF8 =>
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            if S (P) >= Character'Val (16#80#) then
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               V := Get_UTF_32 (In_Char, EM);
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               return;
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            end if;
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         when WCEM_Brackets =>
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            if P + 2 <= S'Last
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              and then S (P) = '['
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              and then S (P + 1) = '"'
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              and then S (P + 2) /= '"'
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            then
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               V := Get_UTF_32 (In_Char, EM);
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               return;
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            end if;
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      end case;
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      --  If it is not a wide character code, just get it
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      V := Character'Pos (S (P));
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      P := P + 1;
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   end Get_Next_Code;
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   ---------------------------
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   -- String_To_Wide_String --
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   ---------------------------
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   procedure String_To_Wide_String
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     (S  : String;
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      R  : out Wide_String;
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      L  : out Natural;
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      EM : System.WCh_Con.WC_Encoding_Method)
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   is
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      SP : Natural;
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      V  : UTF_32_Code;
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   begin
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      pragma Assert (S'First = 1);
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      SP := S'First;
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      L  := 0;
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      while SP <= S'Last loop
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         Get_Next_Code (S, SP, V, EM);
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         if V > 16#FFFF# then
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            raise Constraint_Error with
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              "out of range value for wide character";
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         end if;
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         L := L + 1;
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         R (L) := Wide_Character'Val (V);
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      end loop;
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   end String_To_Wide_String;
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   --------------------------------
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   -- String_To_Wide_Wide_String --
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   --------------------------------
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   procedure String_To_Wide_Wide_String
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     (S  : String;
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      R  : out Wide_Wide_String;
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      L  : out Natural;
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      EM : System.WCh_Con.WC_Encoding_Method)
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   is
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      pragma Assert (S'First = 1);
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      SP : Natural;
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      V  : UTF_32_Code;
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   begin
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      SP := S'First;
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      L := 0;
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      while SP <= S'Last loop
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         Get_Next_Code (S, SP, V, EM);
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         L := L + 1;
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         R (L) := Wide_Wide_Character'Val (V);
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      end loop;
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   end String_To_Wide_Wide_String;
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end System.WCh_StW;

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