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minimize_wdba: use a product to decide accepting SCCs

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Fixes #347.

* spot/twaalgos/minimize.cc, spot/twaalgos/minimize.hh: An SCC of the
determinized automaton is marked as accepting if it intersects any
accepting SCC of the original automaton.  This can be checked by
making a product.  As a consequence the output of minimize_wdba() now
always includes the original language, and minimize_obligation() only
needs a single containment check.
* NEWS: Mention this.
This commit is contained in:
Alexandre Duret-Lutz 2018-06-05 17:42:44 +02:00
parent 4afd1856a6
commit 730c6bbca2
3 changed files with 48 additions and 124 deletions
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20
spot/twaalgos/minimize.hh
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@ -1,5 +1,5 @@
// -*- coding: utf-8 -*-
// Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
// Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2018
// Laboratoire de Recherche et Développement de l'Epita (LRDE).
//
// This file is part of Spot, a model checking library.
@ -64,17 +64,17 @@ namespace spot
/// Deterministic Büchi Automaton, and construct a minimal WDBA for
/// this language. This essentially chains three algorithms:
/// determinization, acceptance adjustment (Löding's coloring
/// algorithm), and minimization (using a Moore-like approache).
/// algorithm), and minimization (using a Moore-like approach).
///
/// If the input automaton does not represent a WDBA language,
/// the resulting automaton is still a WDBA, but it will not
/// be equivalent to the original automaton. Use the
/// minimize_obligation() function if you are not sure whether
/// it is safe to call this function.
///
/// Please see the following paper for a discussion of this
/// technique.
/// If the input automaton does not represent a WDBA language, the
/// resulting automaton is still a WDBA, but it will accept a
/// superset of the original language. Use the
/// minimize_obligation() function if you are not sure whether it is
/// safe to call this function.
///
/// The construction is inspired by the following paper, however we
/// guarantee that the output language is a subsets of the original
/// language while they don't.
/** \verbatim
@InProceedings{ dax.07.atva,
author = {Christian Dax and Jochen Eisinger and Felix Klaedtke},