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--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--             A D A . C O M M A N D _ L I N E . R E M O V E                --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1999-2009, 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.                                     --

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-- 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.      --

--                                                                          --

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

--  This package is intended to be used in conjunction with its parent unit,

--  Ada.Command_Line. It provides facilities for logically removing arguments

--  from the command line, so that subsequent calls to Argument_Count and

--  Argument will reflect the removals.

--  For example, if the original command line has three arguments A B C, so

--  that Argument_Count is initially three, then after removing B, the second

--  argument, Argument_Count will be 2, and Argument (2) will return C.

package Ada.Command_Line.Remove is

   pragma Preelaborate;

   procedure Remove_Argument (Number : Positive);

   --  Removes the argument identified by Number, which must be in the

   --  range 1 .. Argument_Count (i.e. an in range argument number which

   --  reflects removals). If Number is out of range Constraint_Error

   --  will be raised.

   --

   --  Note: the numbering of arguments greater than Number is affected

   --  by the call. If you need a loop through the arguments, removing

   --  some as you go, run the loop in reverse to avoid confusion from

   --  this renumbering:

   --

   --    for J in reverse 1 .. Argument_Count loop

   --      if Should_Remove (Arguments (J)) then

   --        Remove_Argument (J);

   --      end if;

   --    end loop;

   --

   --  Reversing the loop in this manner avoids the confusion.

   procedure Remove_Arguments (From : Positive; To : Natural);

   --  Removes arguments in the given From..To range. From must be in the

   --  range 1 .. Argument_Count and To in the range 0 .. Argument_Count.

   --  Constraint_Error is raised if either argument is out of range. If

   --  To is less than From, then the call has no effect.

   procedure Remove_Argument (Argument : String);

   --  Removes the argument which matches the given string Argument. Has

   --  no effect if no argument matches the string. If more than one

   --  argument matches the string, all are removed.

   procedure Remove_Arguments (Argument_Prefix : String);

   --  Removes all arguments whose prefix matches Argument_Prefix. Has

   --  no effect if no argument matches the string. For example a call

   --  to Remove_Arguments ("--") removes all arguments starting with --.

end Ada.Command_Line.Remove;