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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                             S F N _ S C A N                              --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 2000-2008, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
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-- for  more details.  You should have  received  a copy of the GNU General --
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-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license.          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This package provides a stand alone capability for scanning a gnat.adc
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--  file for Source_File_Name pragmas. This is for use in tools other than
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--  the compiler, which want to scan source file name pragmas without the
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--  overhead of the full compiler scanner and parser.
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--  Note that neither the package spec, nor the package body, of this
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--  unit contains any with statements at all. This is a completely
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--  independent package, suitable for incorporation into tools that do
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--  not access any other units in the GNAT compiler or tools sources.
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--  This package is NOT task safe, so multiple tasks that may call the
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--  Scan_SFN_Pragmas procedure at the same time are responsible for
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--  avoiding such multiple calls by appropriate synchronization.
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package SFN_Scan is
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   --  The call to SFN_Scan passes pointers to two procedures that are
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   --  used to store the results of scanning any Source_File_Name pragmas
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   --  that are encountered. The following access types define the form
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   --  of these procedures:
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   type Set_File_Name_Ptr is access
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     procedure
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       (Typ   : Character;
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        U     : String;
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        F     : String;
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        Index : Natural);
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   --  The procedure with this profile is called when a Source_File_Name
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   --  pragma of the form having a unit name parameter. Typ is 'b' for
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   --  a body file name, and 's' for a spec file name. U is a string that
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   --  contains the unit name, exactly as it appeared in the source file,
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   --  and F is the file taken from the second parameter. Index is taken
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   --  from the third parameter, or is set to zero if no third parameter.
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   type Set_File_Name_Pattern_Ptr is access
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     procedure (Pat : String; Typ : Character; Dot : String; Cas : Character);
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   --  This is called to process a Source_File_Name pragma whose first
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   --  argument is a file pattern. Pat is this pattern string, which
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   --  contains an asterisk to correspond to the unit. Typ is one of
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   --  ('b'/'s'/'u') for body/spec/subunit, Dot is the separator string
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   --  for child/subunit names (default is "."), and Cas is one of
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   --  ('l'/'u'/'m') indicating the required case for the file name.
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   --  The default setting for Cas is 'l' if no parameter is present.
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   Cursor : Natural;
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   --  Used to record the cursor value if a syntax error is found
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   Syntax_Error_In_GNAT_ADC : exception;
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   --  Exception raised if a syntax error is found
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   procedure Scan_SFN_Pragmas
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     (Source   : String;
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      SFN_Ptr  : Set_File_Name_Ptr;
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      SFNP_Ptr : Set_File_Name_Pattern_Ptr);
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   --  This is the procedure called to scan a gnat.adc file. The Source
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   --  parameter points to the full text of the file, with normal line end
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   --  characters, in the format normally read by the compiler. The two
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   --  parameters SFN_Ptr and SFNP_Ptr point to procedures that will be
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   --  called to register Source_File_Name pragmas as they are found.
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   --
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   --  If a syntax error is found, then Syntax_Error_In_GNAT_ADC is raised,
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   --  and the location SFN_Scan.Cursor contains the approximate index of
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   --  the error in the source string.
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   --
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   --  The scan assumes that it is dealing with a valid gnat.adc file,
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   --  that includes only pragmas and comments. It does not do a full
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   --  syntax correctness scan by any means, but if it does find anything
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   --  that it can tell is wrong it will immediately raise the exception
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   --  to indicate the approximate location of the error
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end SFN_Scan;

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