1. LICENSE

LTL2BA - Version 1.0 - October 2001
Written by Denis Oddoux, LIAFA, France                                 
Copyright (c) 2001  Denis Oddoux                                       
                                                                       
This program 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 of the License, or      
(at your option) any later version. GNU GPL is included in this 
distribution, in a file called 'LICENSE'
                                                                       
This program 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 this program; if not, write to the Free Software            
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
                                                                       
Based on the translation algorithm by Gastin and Oddoux,               
presented at the CAV Conference, held in 2001, Paris, France 2001.     
Send bug-reports and/or questions to: ltl2ba@liafa.jussieu.fr    
or to Denis Oddoux                                                     
      LIAFA, UMR 7089, case 7014                                       
      Universite Paris 7                                               
      2, place Jussieu                                                 
      F-75251 Paris Cedex 05                                          
      FRANCE                                                               

The LTL2BA software is written by Denis Oddoux, the algorithm it uses
was published in :
	G. Berry, H. Comon, A. Finkel (Eds.):
	Computer Aided Verification
	13th International Conference, CAV 2001, 
	Paris, France, July 18-22, 2001, Proceedings - LNCS 2102
	"Fast LTL to Büchi Automata Translation", 
	P.Gastin and D.Oddoux, pp. 53-65

Part of the code included is issued from the SPIN software Version 3.4.1
The SPIN software is written by Gerard J. Holzmann, originally as part
of ``Design and Validation of Protocols,'' ISBN 0-13-539925-4,
1991, Prentice Hall, Englewood Cliffs, NJ, 07632
Here are the files that contain some code from Spin v3.4.1 :

	cache.c  (originally tl_cache.c)
	lex.c    (           tl_lex.c  )
	ltl2ba.h (	     tl.h      )
	main.c   (	     tl_main.c )
	mem.c	 (	     tl_mem.c  )
	parse.c  (	     tl_parse.c)
	rewrt.c  (	     tl_rewrt.c)
	trans.c	 (	     tl_trans.c)

2. COMPILING

open the archive :
> gunzip ltl2ba.tar.gz
> tar xf ltl2ba.tar
> cd ltl2ba

compile the program
> make

3. EXECUTING

run the program
> ./ltl2ba -f "formula"

The formula is an LTL formula, and may contain propositional symbols, 
boolean operators, temporal operators, and parentheses.
The syntax used is the one used in the 'Spin' model-checker

Propositonal Symbols:
        true, false
	any lowercase string

Boolean operators:
        !   (negation)
        ->  (implication)
	<-> (equivalence)
        &&  (and)
        ||  (or)

Temporal operators:
        []  (always)
        <>  (eventually)
        U   (until)
        V   (release)
        X   (next)

Use spaces between any symbols.

The result is a never claim in Promela that can be given to the
Spin model checker to verify properties on a system.

run the command
> ./ltl2ba
to see the possible options for executing the program

For more details, read the following paper
	G. Berry, H. Comon, A. Finkel (Eds.):
	Computer Aided Verification
	13th International Conference, CAV 2001, 
	Paris, France, July 18-22, 2001, Proceedings - LNCS 2102
	"Fast LTL to Büchi Automata Translation", 
	P.Gastin and D.Oddoux, pp. 53-65

This tool is also available on-line, at the following address :

http://verif.liafa.jussieu.fr/ltl2ba