--          This file is part of SmallEiffel The GNU Eiffel Compiler.
--          Copyright (C) 1994-98 LORIA - UHP - CRIN - INRIA - FRANCE
--            Dominique COLNET and Suzanne COLLIN - colnet@loria.fr 
--                       http://www.loria.fr/SmallEiffel
-- SmallEiffel is  free  software;  you can  redistribute it and/or modify it 
-- under the terms of the GNU General Public License as published by the Free
-- Software  Foundation;  either  version  2, or (at your option)  any  later 
-- version. SmallEiffel is distributed in the hope that it will be useful,but
-- WITHOUT 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  along  with  SmallEiffel;  see the file COPYING.  If not,
-- write to the  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-- Boston, MA 02111-1307, USA.
--
class PARSER_BUFFER
   
inherit GLOBALS;
   
creation make
   
feature

   path: STRING;
	 -- When `is_ready', gives the `path' of the corresponding 
	 -- buffered file.
   
   count: INTEGER;
	 -- Number of lines in the source file.
   
feature {NONE}
   
   text: FIXED_ARRAY[STRING] is
	 -- To store the complete file to parse. Each line 
	 -- is one STRING without the '%N' end-of-line mark.
      once
	 !!Result.with_capacity(4096);
      end;

feature {NONE}
   
   make is
      do
      end;

feature

   is_ready: BOOLEAN is
      do
	 Result := path /= Void;
      end;

feature {SMALL_EIFFEL,EIFFEL_PARSER}

   load_file(a_path: STRING) is
	 -- Try to load `a_path' and set `is_ready' when corresponding
	 -- file has been loaded.
      local
	 i: INTEGER;
      do
	 tmp_file_read.connect_to(a_path);
	 if tmp_file_read.is_connected then
	    path := a_path;
	    from
	       if get_line(0) /= Void then
		  -- unused line.
	       end;
	       i := 1;
	       tmp_file_read.read_line_in(get_line(i));
	    until
	       tmp_file_read.end_of_input
	    loop
	       i := i + 1;
	       tmp_file_read.read_line_in(get_line(i));
	    end;
	    if text.item(i).empty then
	       count := i - 1;
	    else
	       count := i;
	    end;
	    tmp_file_read.disconnect;
	 else
	    path := Void;
	 end;
      end;
   
   unset_is_ready is
      do
	 path := Void;
      end;
   
feature {EIFFEL_PARSER}
   
   item(line: INTEGER): STRING is
      require 
	 is_ready;
	 1 <= line;
	 line <= count
      do
	 Result := text.item(line);
      ensure
	 Result /= Void
      end;
   
feature {NONE}
   
   get_line(i: INTEGER): STRING is
      require
	 i >= 0
      do
	 if i <= text.upper then
	    Result := text.item(i);
	    Result.clear;
	 else
	    !!Result.make(medium_line_size);
	    text.add_last(Result);
	 end;
      ensure
	 Result.empty;
	 Result.capacity >= medium_line_size;
	 text.item(i) = Result
      end;

   medium_line_size: INTEGER is 80;

end -- PARSER_BUFFER