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postproc: option to wdba-minimize only when sure

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Fixes #15.

* spot/twaalgos/minimize.hh, spot/twaalgos/minimize.cc
(minimize_obligation_garanteed_to_work): New function.
* spot/twaalgos/postproc.hh, spot/twaalgos/postproc.cc: Use it if
wdba-minimize=1.  Handle new default for wdba-minimize.
* NEWS, bin/spot-x.cc: Document those changes.
* tests/core/ltl2tgba2.test: Add some test cases.
* tests/core/genltl.test: Improve expected results.
This commit is contained in:
Alexandre Duret-Lutz 2020-05-21 15:42:05 +02:00
parent 579ff63817
commit a0767e3c1e
8 changed files with 79 additions and 22 deletions
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22
spot/twaalgos/minimize.hh
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@ -1,6 +1,6 @@
// -*- coding: utf-8 -*-
// Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2018, 2019
// Laboratoire de Recherche et Développement de l'Epita (LRDE).
// Copyright (C) 2009-2016, 2018-2020 Laboratoire de Recherche et
// Développement de l'Epita (LRDE).
//
// This file is part of Spot, a model checking library.
//
@ -116,5 +116,23 @@ namespace spot
const_twa_graph_ptr aut_neg_f = nullptr,
bool reject_bigger = false,
const output_aborter* aborter = nullptr);
/// \brief Whether calling minimize_obligation is sure to work
///
/// This checks whether \a f is a syntactic obligation, or if \a
/// aut_f obviously corresponds to an obligation (for instance if
/// this is a terminal automaton, or if it is both weak and
/// deterministic). In this case, calling minimize_obligation()
/// should not be a waste of time, as it will return a new
/// automaton.
///
/// If this function returns false, the input property might still
/// be a pathological obligation. The only way to know is to call
/// minimize_obligation(), but as it is less likely, you might
/// decide to save time.
SPOT_API
bool minimize_obligation_garanteed_to_work(const const_twa_graph_ptr& aut_f,
formula f = nullptr);
/// @}
}