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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             N A M E T . S P                              --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--            Copyright (C) 2008-2009, 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_Cnv; use System.WCh_Cnv;

with GNAT.UTF_32_Spelling_Checker;

package body Namet.Sp is

   -----------------------

   -- Local Subprograms --

   -----------------------

   procedure Get_Name_String_UTF_32

     (Id     : Name_Id;

      Result : out UTF_32_String;

      Length : out Natural);

   --  This procedure is similar to Get_Decoded_Name except that the output

   --  is stored in the given Result array as single codes, so in particular

   --  any Uhh, Whhhh, or WWhhhhhhhh sequences are decoded to appear as a

   --  single value in the output. This call does not affect the contents of

   --  either Name_Buffer or Name_Len. The result is in Result (1 .. Length).

   --  The caller must ensure that the result buffer is long enough.

   ----------------------------

   -- Get_Name_String_UTF_32 --

   ----------------------------

   procedure Get_Name_String_UTF_32

     (Id     : Name_Id;

      Result : out UTF_32_String;

      Length : out Natural)

   is

      pragma Assert (Result'First = 1);

      SPtr : Int := Name_Entries.Table (Id).Name_Chars_Index + 1;

      --  Index through characters of name in Name_Chars table. Initial value

      --  points to first character of the name.

      SLen : constant Nat := Nat (Name_Entries.Table (Id).Name_Len);

      --  Length of the name

      SLast : constant Int := SPtr + SLen - 1;

      --  Last index in Name_Chars table for name

      C : Character;

      --  Current character from Name_Chars table

      procedure Store_Hex (N : Natural);

      --  Read and store next N characters starting at SPtr and store result

      --  in next character of Result. Update SPtr past characters read.

      ---------------

      -- Store_Hex --

      ---------------

      procedure Store_Hex (N : Natural) is

         T : UTF_32_Code;

         C : Character;

      begin

         T := 0;

         for J in 1 .. N loop

            C := Name_Chars.Table (SPtr);

            SPtr := SPtr + 1;

            if C in '0' .. '9' then

               T := 16 * T + Character'Pos (C) - Character'Pos ('0');

            else

               pragma Assert (C in 'a' .. 'f');

               T := 16 * T + Character'Pos (C) - (Character'Pos ('a') - 10);

            end if;

         end loop;

         Length := Length + 1;

         pragma Assert (Length <= Result'Length);

         Result (Length) := T;

      end Store_Hex;

   --  Start of processing for Get_Name_String_UTF_32

   begin

      Length := 0;

      while SPtr <= SLast loop

         C := Name_Chars.Table (SPtr);

         --  Uhh encoding

         if C = 'U'

           and then SPtr <= SLast - 2

           and then Name_Chars.Table (SPtr + 1) not in 'A' .. 'Z'

         then

            SPtr := SPtr + 1;

            Store_Hex (2);

         --  Whhhh encoding

         elsif C = 'W'

           and then SPtr <= SLast - 4

           and then Name_Chars.Table (SPtr + 1) not in 'A' .. 'Z'

         then

            SPtr := SPtr + 1;

            Store_Hex (4);

         --  WWhhhhhhhh encoding

         elsif C = 'W'

           and then SPtr <= SLast - 8

           and then Name_Chars.Table (SPtr + 1) = 'W'

         then

            SPtr := SPtr + 2;

            Store_Hex (8);

         --  Q encoding (character literal)

         elsif C = 'Q' and then SPtr < SLast then

            --  Put apostrophes around character

            pragma Assert (Length <= Result'Last - 3);

            Result (Length + 1) := UTF_32_Code'Val (Character'Pos ('''));

            Result (Length + 2) :=

              UTF_32_Code (Get_Char_Code (Name_Chars.Table (SPtr + 1)));

            Result (Length + 3) := UTF_32_Code'Val (Character'Pos ('''));

            SPtr := SPtr + 2;

            Length := Length + 3;

         --  Unencoded case

         else

            SPtr := SPtr + 1;

            Length := Length + 1;

            pragma Assert (Length <= Result'Last);

            Result (Length) := UTF_32_Code (Get_Char_Code (C));

         end if;

      end loop;

   end Get_Name_String_UTF_32;

   ------------------------

   -- Is_Bad_Spelling_Of --

   ------------------------

   function Is_Bad_Spelling_Of (Found, Expect : Name_Id) return Boolean is

      FL : constant Natural := Natural (Length_Of_Name (Found));

      EL : constant Natural := Natural (Length_Of_Name (Expect));

      --  Length of input names

      FB : UTF_32_String (1 .. 2 * FL);

      EB : UTF_32_String (1 .. 2 * EL);

      --  Buffers for results, a factor of 2 is more than enough, the only

      --  sequence which expands is Q (character literal) by 1.5 times.

      FBL : Natural;

      EBL : Natural;

      --  Length of decoded names

   begin

      Get_Name_String_UTF_32 (Found, FB, FBL);

      Get_Name_String_UTF_32 (Expect, EB, EBL);

      --  For an exact match, return False, otherwise check bad spelling. We

      --  need this special test because the library routine returns True for

      --  an exact match.

      if FB (1 .. FBL) = EB (1 .. EBL) then

         return False;

      else

         return

           GNAT.UTF_32_Spelling_Checker.Is_Bad_Spelling_Of

             (FB (1 .. FBL), EB (1 .. EBL));

      end if;

   end Is_Bad_Spelling_Of;

end Namet.Sp;