80 lines
4.5 KiB
Ada
80 lines
4.5 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . C O M M A N D _ L I N E . R E M O V E --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1999-2009, 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 intended to be used in conjunction with its parent unit,
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-- Ada.Command_Line. It provides facilities for logically removing arguments
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-- from the command line, so that subsequent calls to Argument_Count and
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-- Argument will reflect the removals.
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-- For example, if the original command line has three arguments A B C, so
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-- that Argument_Count is initially three, then after removing B, the second
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-- argument, Argument_Count will be 2, and Argument (2) will return C.
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package Ada.Command_Line.Remove is
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pragma Preelaborate;
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procedure Remove_Argument (Number : Positive);
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-- Removes the argument identified by Number, which must be in the
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-- range 1 .. Argument_Count (i.e. an in range argument number which
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-- reflects removals). If Number is out of range Constraint_Error
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-- will be raised.
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--
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-- Note: the numbering of arguments greater than Number is affected
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-- by the call. If you need a loop through the arguments, removing
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-- some as you go, run the loop in reverse to avoid confusion from
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-- this renumbering:
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--
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-- for J in reverse 1 .. Argument_Count loop
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-- if Should_Remove (Arguments (J)) then
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-- Remove_Argument (J);
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-- end if;
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-- end loop;
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--
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-- Reversing the loop in this manner avoids the confusion.
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procedure Remove_Arguments (From : Positive; To : Natural);
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-- Removes arguments in the given From..To range. From must be in the
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-- range 1 .. Argument_Count and To in the range 0 .. Argument_Count.
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-- Constraint_Error is raised if either argument is out of range. If
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-- To is less than From, then the call has no effect.
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procedure Remove_Argument (Argument : String);
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-- Removes the argument which matches the given string Argument. Has
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-- no effect if no argument matches the string. If more than one
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-- argument matches the string, all are removed.
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procedure Remove_Arguments (Argument_Prefix : String);
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-- Removes all arguments whose prefix matches Argument_Prefix. Has
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-- no effect if no argument matches the string. For example a call
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-- to Remove_Arguments ("--") removes all arguments starting with --.
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end Ada.Command_Line.Remove;
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