gcc/ada/libgnat/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) 1999-2017, 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 3,  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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This package is intended to be used in conjunction with its parent unit,
  33 --  Ada.Command_Line. It provides facilities for logically removing arguments
  34 --  from the command line, so that subsequent calls to Argument_Count and
  35 --  Argument will reflect the removals.
  36
  37 --  For example, if the original command line has three arguments A B C, so
  38 --  that Argument_Count is initially three, then after removing B, the second
  39 --  argument, Argument_Count will be 2, and Argument (2) will return C.
  40
  41 package Ada.Command_Line.Remove is
  42    pragma Preelaborate;
  43
  44    procedure Remove_Argument (Number : Positive);
  45    --  Removes the argument identified by Number, which must be in the
  46    --  range 1 .. Argument_Count (i.e. an in range argument number which
  47    --  reflects removals). If Number is out of range Constraint_Error
  48    --  will be raised.
  49    --
  50    --  Note: the numbering of arguments greater than Number is affected
  51    --  by the call. If you need a loop through the arguments, removing
  52    --  some as you go, run the loop in reverse to avoid confusion from
  53    --  this renumbering:
  54    --
  55    --    for J in reverse 1 .. Argument_Count loop
  56    --      if Should_Remove (Arguments (J)) then
  57    --        Remove_Argument (J);
  58    --      end if;
  59    --    end loop;
  60    --
  61    --  Reversing the loop in this manner avoids the confusion.
  62
  63    procedure Remove_Arguments (From : Positive; To : Natural);
  64    --  Removes arguments in the given From..To range. From must be in the
  65    --  range 1 .. Argument_Count and To in the range 0 .. Argument_Count.
  66    --  Constraint_Error is raised if either argument is out of range. If
  67    --  To is less than From, then the call has no effect.
  68
  69    procedure Remove_Argument (Argument : String);
  70    --  Removes the argument which matches the given string Argument. Has
  71    --  no effect if no argument matches the string. If more than one
  72    --  argument matches the string, all are removed.
  73
  74    procedure Remove_Arguments (Argument_Prefix : String);
  75    --  Removes all arguments whose prefix matches Argument_Prefix. Has
  76    --  no effect if no argument matches the string. For example a call
  77    --  to Remove_Arguments ("--") removes all arguments starting with --.
  78
  79 end Ada.Command_Line.Remove;