gcc/ada/a-colire.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME 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 --          Copyright (C) 1999-2006, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This package is intended to be used in conjunction with its parent unit,
  35 --  Ada.Command_Line. It provides facilities for logically removing arguments
  36 --  from the command line, so that subsequent calls to Argument_Count and
  37 --  Argument will reflect the removals.
  38
  39 --  For example, if the original command line has three arguments A B C, so
  40 --  that Argument_Count is initially three, then after removing B, the second
  41 --  argument, Argument_Count will be 2, and Argument (2) will return C.
  42
  43 package Ada.Command_Line.Remove is
  44    pragma Preelaborate;
  45
  46    procedure Remove_Argument (Number : Positive);
  47    --  Removes the argument identified by Number, which must be in the
  48    --  range 1 .. Argument_Count (i.e. an in range argument number which
  49    --  reflects removals). If Number is out of range Constraint_Error
  50    --  will be raised.
  51    --
  52    --  Note: the numbering of arguments greater than Number is affected
  53    --  by the call. If you need a loop through the arguments, removing
  54    --  some as you go, run the loop in reverse to avoid confusion from
  55    --  this renumbering:
  56    --
  57    --    for J in reverse 1 .. Argument_Count loop
  58    --      if Should_Remove (Arguments (J)) then
  59    --        Remove_Argument (J);
  60    --      end if;
  61    --    end loop;
  62    --
  63    --  Reversing the loop in this manner avoids the confusion.
  64
  65    procedure Remove_Arguments (From : Positive; To : Natural);
  66    --  Removes arguments in the given From..To range. From must be in the
  67    --  range 1 .. Argument_Count and To in the range 0 .. Argument_Count.
  68    --  Constraint_Error is raised if either argument is out of range. If
  69    --  To is less than From, then the call has no effect.
  70
  71    procedure Remove_Argument (Argument : String);
  72    --  Removes the argument which matches the given string Argument. Has
  73    --  no effect if no argument matches the string. If more than one
  74    --  argument matches the string, all are removed.
  75
  76    procedure Remove_Arguments (Argument_Prefix : String);
  77    --  Removes all arguments whose prefix matches Argument_Prefix. Has
  78    --  no effect if no argument matches the string. For example a call
  79    --  to Remove_Arguments ("--") removes all arguments starting with --.
  80
  81 end Ada.Command_Line.Remove;