------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S Y S T E M . V A L _ E N U M -- -- -- -- S p e c -- -- -- -- Copyright (C) 1992-2000, 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, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, 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. -- -- -- ------------------------------------------------------------------------------ -- This package is used to compute the Value attribute for enumeration types -- other than those in packages Standard and System. See unit Exp_Imgv for -- details of the format of constructed image tables. package System.Val_Enum is pragma Pure (Val_Enum); function Value_Enumeration_8 (Names : String; Indexes : System.Address; Num : Natural; Str : String) return Natural; -- Used to compute Enum'Value (Str) where Enum is some enumeration type -- other than those defined in package Standard. Names is a string with -- a lower bound of 1 containing the characters of all the enumeration -- literals concatenated together in sequence. Indexes is the address -- of an array of type array (0 .. N) of Natural_8, where N is the -- number of enumeration literals in the type. The Indexes values are -- the starting subscript of each enumeration literal, indexed by Pos -- values, with an extra entry at the end containing Names'Length + 1. -- The parameter Num is the value N - 1 (i.e. Enum'Pos (Enum'Last)). -- The reason that Indexes is passed by address is that the actual type -- is created on the fly by the expander. -- -- Str is the argument of the attribute function, and may have leading -- and trailing spaces, and letters can be upper or lower case or mixed. -- If the image is found in Names, then the corresponding Pos value is -- returned. If not, Constraint_Error is raised. function Value_Enumeration_16 (Names : String; Indexes : System.Address; Num : Natural; Str : String) return Natural; -- Identical to Value_Enumeration_8 except that it handles types -- using array (0 .. Num) of Natural_16 for the Indexes table. function Value_Enumeration_32 (Names : String; Indexes : System.Address; Num : Natural; Str : String) return Natural; -- Identical to Value_Enumeration_8 except that it handles types -- using array (0 .. Num) of Natural_32 for the Indexes table. end System.Val_Enum;