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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                               S W I T C H                                --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2009, 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 3,  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 COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  This package together with a child package appropriate to the client tool

--  scans switches. Note that the body of the appropriate Usage package must be

--  coordinated with the switches that are recognized by this package. These

--  Usage packages also act as the official documentation for the switches

--  that are recognized. In addition, package Debug documents the otherwise

--  undocumented debug switches that are also recognized.

with Gnatvsn;

with Types; use Types;

------------

-- Switch --

------------

package Switch is

   --  Common switches for GNU tools

   Version_Switch : constant String := "--version";

   Help_Switch    : constant String := "--help";

   -----------------

   -- Subprograms --

   -----------------

   generic

      with procedure Usage;

      --  Print tool-specific part of --help message

   procedure Check_Version_And_Help_G

     (Tool_Name      : String;

      Initial_Year   : String;

      Version_String : String := Gnatvsn.Gnat_Version_String);

   --  Check if switches --version or --help is used. If one of this switch is

   --  used, issue the proper messages and end the process.

   procedure Display_Version

     (Tool_Name      : String;

      Initial_Year   : String;

      Version_String : String := Gnatvsn.Gnat_Version_String);

   --  Display version of a tool when switch --version is used

   function Is_Switch (Switch_Chars : String) return Boolean;

   --  Returns True iff Switch_Chars is at least two characters long, and the

   --  first character is an hyphen ('-').

   function Is_Front_End_Switch (Switch_Chars : String) return Boolean;

   --  Returns True iff Switch_Chars represents a front-end switch, i.e. it

   --  starts with -I, -gnat or -?RTS.

   function Is_Internal_GCC_Switch (Switch_Chars : String) return Boolean;

   --  Returns True iff Switch_Chars represents an internal GCC switch to be

   --  followed by a single argument, such as -dumpbase, --param or -auxbase.

   --  Eventhough passed by the "gcc" driver, these need not be stored in ALI

   --  files and may safely be ignored by non GCC back-ends.

   function Switch_Last (Switch_Chars : String) return Natural;

   --  Index in Switch_Chars of the last relevant character for later string

   --  comparison purposes. This is typically 'Last, minus one if there is a

   --  terminating ASCII.NUL.

private

   --  This section contains some common routines used by the tool dependent

   --  child packages (there is one such child package for each tool that uses

   --  Switches to scan switches - Compiler/gnatbind/gnatmake/.

   Switch_Max_Value : constant := 999_999;

   --  Maximum value permitted in switches that take a value

   function Nat_Present

     (Switch_Chars : String;

      Max          : Integer;

      Ptr          : Integer) return Boolean;

   --  Returns True if an integer is at the current scan location or an equal

   --  sign. This is used as a guard for calling Scan_Nat. Switch_Chars is the

   --  string containing the switch, and Ptr points just past the switch

   --  character. Max is the maximum alllowed value of Ptr.

   procedure Scan_Nat

     (Switch_Chars : String;

      Max          : Integer;

      Ptr          : in out Integer;

      Result       : out Nat;

      Switch       : Character);

   --  Scan natural integer parameter for switch. On entry, Ptr points just

   --  past the switch character, on exit it points past the last digit of the

   --  integer value. Max is the maximum allowed value of Ptr, so the scan is

   --  restricted to Switch_Chars (Ptr .. Max). It is posssible for Ptr to be

   --  one greater than Max on return if the entire string is digits. Scan_Nat

   --  will skip an optional equal sign if it is present. Nat_Present must be

   --  True, or an error will be signalled.

   procedure Scan_Pos

     (Switch_Chars : String;

      Max          : Integer;

      Ptr          : in out Integer;

      Result       : out Pos;

      Switch       : Character);

   --  Scan positive integer parameter for switch. On entry, Ptr points just

   --  past the switch character, on exit it points past the last digit of the

   --  integer value.

   procedure Bad_Switch (Switch : Character);

   procedure Bad_Switch (Switch : String);

   --  Fail with an appropriate message when a switch is not recognized

end Switch;