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------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME 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 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 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 (Remove);
procedure Remove_Argument (Number : in 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;
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