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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             G E T _ A L F A                              --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--             Copyright (C) 2011, 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 contains the function used to read Alfa information from an

--  ALI file and populate the tables defined in package Alfa with the result.

generic

   --  These subprograms provide access to the ALI file. Locating, opening and

   --  providing access to the ALI file is the callers' responsibility.

   with function Getc return Character is <>;

   --  Get next character, positioning the ALI file ready to read the following

   --  character (equivalent to calling Nextc, then Skipc). If the end of file

   --  is encountered, the value Types.EOF is returned.

   with function Nextc return Character is <>;

   --  Look at the next character, and return it, leaving the position of the

   --  file unchanged, so that a subsequent call to Getc or Nextc will return

   --  this same character. If the file is positioned at the end of file, then

   --  Types.EOF is returned.

   with procedure Skipc is <>;

   --  Skip past the current character (which typically was read with Nextc),

   --  and position to the next character, which will be returned by the next

   --  call to Getc or Nextc.

procedure Get_Alfa;

--  Load Alfa information from ALI file text format into internal Alfa tables

--  (Alfa.Alfa_Xref_Table, Alfa.Alfa_Scope_Table and Alfa.Alfa_File_Table). On

--  entry the input file is positioned to the initial 'F' of the first Alfa

--  line in the ALI file. On return, the file is positioned either to the end

--  of file, or to the first character of the line following the Alfa

--  information (which will never start with an 'F').

--

--  If a format error is detected in the input, then an exception is raised

--  (Ada.IO_Exceptions.Data_Error), with the file positioned to the error.