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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                      S Y S T E M . V A L _ E N U M                       --
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--                                                                          --
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--                                 S p e c                                  --
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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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--  This package is used to compute the Value attribute for enumeration types
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--  other than those in packages Standard and System. See unit Exp_Imgv for
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--  details of the format of constructed image tables.
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package System.Val_Enum is
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   pragma Pure;
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   function Value_Enumeration_8
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     (Names   : String;
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      Indexes : System.Address;
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      Num     : Natural;
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      Str     : String)
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      return    Natural;
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   --  Used to compute Enum'Value (Str) where Enum is some enumeration type
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   --  other than those defined in package Standard. Names is a string with
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   --  a lower bound of 1 containing the characters of all the enumeration
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   --  literals concatenated together in sequence. Indexes is the address
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   --  of an array of type array (0 .. N) of Natural_8, where N is the
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   --  number of enumeration literals in the type. The Indexes values are
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   --  the starting subscript of each enumeration literal, indexed by Pos
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   --  values, with an extra entry at the end containing Names'Length + 1.
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   --  The parameter Num is the value N - 1 (i.e. Enum'Pos (Enum'Last)).
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   --  The reason that Indexes is passed by address is that the actual type
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   --  is created on the fly by the expander.
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   --
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   --  Str is the argument of the attribute function, and may have leading
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   --  and trailing spaces, and letters can be upper or lower case or mixed.
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   --  If the image is found in Names, then the corresponding Pos value is
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   --  returned. If not, Constraint_Error is raised.
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   function Value_Enumeration_16
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     (Names   : String;
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      Indexes : System.Address;
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      Num     : Natural;
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      Str     : String)
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      return    Natural;
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   --  Identical to Value_Enumeration_8 except that it handles types
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   --  using array (0 .. Num) of Natural_16 for the Indexes table.
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   function Value_Enumeration_32
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     (Names   : String;
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      Indexes : System.Address;
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      Num     : Natural;
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      Str     : String)
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      return    Natural;
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   --  Identical to Value_Enumeration_8 except that it handles types
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   --  using array (0 .. Num) of Natural_32 for the Indexes table.
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end System.Val_Enum;

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