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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             S F N _ S C A N                              --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 2000-2008, 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.      --

--                                                                          --

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--  This package provides a stand alone capability for scanning a gnat.adc

--  file for Source_File_Name pragmas. This is for use in tools other than

--  the compiler, which want to scan source file name pragmas without the

--  overhead of the full compiler scanner and parser.

--  Note that neither the package spec, nor the package body, of this

--  unit contains any with statements at all. This is a completely

--  independent package, suitable for incorporation into tools that do

--  not access any other units in the GNAT compiler or tools sources.

--  This package is NOT task safe, so multiple tasks that may call the

--  Scan_SFN_Pragmas procedure at the same time are responsible for

--  avoiding such multiple calls by appropriate synchronization.

package SFN_Scan is

   --  The call to SFN_Scan passes pointers to two procedures that are

   --  used to store the results of scanning any Source_File_Name pragmas

   --  that are encountered. The following access types define the form

   --  of these procedures:

   type Set_File_Name_Ptr is access

     procedure

       (Typ   : Character;

        U     : String;

        F     : String;

        Index : Natural);

   --  The procedure with this profile is called when a Source_File_Name

   --  pragma of the form having a unit name parameter. Typ is 'b' for

   --  a body file name, and 's' for a spec file name. U is a string that

   --  contains the unit name, exactly as it appeared in the source file,

   --  and F is the file taken from the second parameter. Index is taken

   --  from the third parameter, or is set to zero if no third parameter.

   type Set_File_Name_Pattern_Ptr is access

     procedure (Pat : String; Typ : Character; Dot : String; Cas : Character);

   --  This is called to process a Source_File_Name pragma whose first

   --  argument is a file pattern. Pat is this pattern string, which

   --  contains an asterisk to correspond to the unit. Typ is one of

   --  ('b'/'s'/'u') for body/spec/subunit, Dot is the separator string

   --  for child/subunit names (default is "."), and Cas is one of

   --  ('l'/'u'/'m') indicating the required case for the file name.

   --  The default setting for Cas is 'l' if no parameter is present.

   Cursor : Natural;

   --  Used to record the cursor value if a syntax error is found

   Syntax_Error_In_GNAT_ADC : exception;

   --  Exception raised if a syntax error is found

   procedure Scan_SFN_Pragmas

     (Source   : String;

      SFN_Ptr  : Set_File_Name_Ptr;

      SFNP_Ptr : Set_File_Name_Pattern_Ptr);

   --  This is the procedure called to scan a gnat.adc file. The Source

   --  parameter points to the full text of the file, with normal line end

   --  characters, in the format normally read by the compiler. The two

   --  parameters SFN_Ptr and SFNP_Ptr point to procedures that will be

   --  called to register Source_File_Name pragmas as they are found.

   --

   --  If a syntax error is found, then Syntax_Error_In_GNAT_ADC is raised,

   --  and the location SFN_Scan.Cursor contains the approximate index of

   --  the error in the source string.

   --

   --  The scan assumes that it is dealing with a valid gnat.adc file,

   --  that includes only pragmas and comments. It does not do a full

   --  syntax correctness scan by any means, but if it does find anything

   --  that it can tell is wrong it will immediately raise the exception

   --  to indicate the approximate location of the error

end SFN_Scan;