gcc/ada/a-colire.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --             A D A . C O M M A N D _ L I N E . R E M O V E                --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.1 $
  10 --                                                                          --
  11 --        Copyright (C) 1999 Free Software Foundation, Inc.                 --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 --  This package is intended to be used in conjunction with its parent unit,
  37 --  Ada.Command_Line. It provides facilities for logically removing arguments
  38 --  from the command line, so that subsequent calls to Argument_Count and
  39 --  Argument will reflect the removals.
  40
  41 --  For example, if the original command line has three arguments A B C, so
  42 --  that Argument_Count is initially three, then after removing B, the second
  43 --  argument, Argument_Count will be 2, and Argument (2) will return C.
  44
  45 package Ada.Command_Line.Remove is
  46 pragma Preelaborate (Remove);
  47
  48    procedure Remove_Argument (Number : in Positive);
  49    --  Removes the argument identified by Number, which must be in the
  50    --  range 1 .. Argument_Count (i.e. an in range argument number which
  51    --  reflects removals). If Number is out of range Constraint_Error
  52    --  will be raised.
  53    --
  54    --  Note: the numbering of arguments greater than Number is affected
  55    --  by the call. If you need a loop through the arguments, removing
  56    --  some as you go, run the loop in reverse to avoid confusion from
  57    --  this renumbering:
  58    --
  59    --    for J in reverse 1 .. Argument_Count loop
  60    --      if Should_Remove (Arguments (J)) then
  61    --        Remove_Argument (J);
  62    --      end if;
  63    --    end loop;
  64    --
  65    --  Reversing the loop in this manner avoids the confusion.
  66
  67    procedure Remove_Arguments (From : Positive; To : Natural);
  68    --  Removes arguments in the given From..To range. From must be in the
  69    --  range 1 .. Argument_Count and To in the range 0 .. Argument_Count.
  70    --  Constraint_Error is raised if either argument is out of range. If
  71    --  To is less than From, then the call has no effect.
  72
  73    procedure Remove_Argument (Argument : String);
  74    --  Removes the argument which matches the given string Argument. Has
  75    --  no effect if no argument matches the string. If more than one
  76    --  argument matches the string, all are removed.
  77
  78    procedure Remove_Arguments (Argument_Prefix : String);
  79    --  Removes all arguments whose prefix matches Argument_Prefix. Has
  80    --  no effect if no argument matches the string. For example a call
  81    --  to Remove_Arguments ("--") removes all arguments starting with --.
  82
  83 end Ada.Command_Line.Remove;