77d704ea9e
* src/ltlast/unop.cc: Perform the simplification. * src/ltlast/unop.hh, doc/tl/tl.tex: Document it. * src/ltltest/equals.test: Adjust test cases.
130 lines
3.8 KiB
C++
130 lines
3.8 KiB
C++
// Copyright (C) 2009, 2010, 2011 Laboratoire de Recherche et Développement
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// de l'Epita (LRDE).
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// Copyright (C) 2003, 2004 Laboratoire d'Informatique de Paris
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// 6 (LIP6), département Systèmes Répartis Coopératifs (SRC),
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// Université Pierre et Marie Curie.
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//
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// This file is part of Spot, a model checking library.
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//
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// Spot is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// Spot is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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// License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Spot; see the file COPYING. If not, write to the Free
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// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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// 02111-1307, USA.
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/// \file ltlast/unop.hh
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/// \brief LTL unary operators
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#ifndef SPOT_LTLAST_UNOP_HH
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# define SPOT_LTLAST_UNOP_HH
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#include <map>
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#include <iosfwd>
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#include "refformula.hh"
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#include "bunop.hh"
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namespace spot
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{
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namespace ltl
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{
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/// \brief Unary operators.
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/// \ingroup ltl_ast
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class unop : public ref_formula
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{
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public:
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enum type {
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// LTL
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Not, X, F, G,
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// ELTL
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Finish,
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// Closure
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Closure, NegClosure,
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};
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/// \brief Build an unary operator with operation \a op and
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/// child \a child.
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///
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/// The following trivial simplifications are performed
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/// automatically (the left expression is rewritten as the right
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/// expression):
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/// - FF(Exp) = F(Exp)
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/// - GG(Exp) = G(Exp)
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/// - F(0) = 0
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/// - G(0) = 0
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/// - X(0) = 0
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/// - F(1) = 1
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/// - G(1) = 1
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/// - X(1) = 1
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/// - !1 = 0
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/// - !0 = 1
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/// - ![*0] = 1[+] (read below)
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/// - !!Exp = Exp
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/// - !Closure(Exp) = NegClosure(Exp)
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/// - !NegClosure(Exp) = Closure(Exp)
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/// - Closure([*0]) = 1
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/// - Closure(1) = 1
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/// - Closure(0) = 0
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/// - Closure(b) = b
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/// - NegClosure([*0]) = 0
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/// - NegClosure(1) = 0
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/// - NegClosure(0) = 1
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/// - NegClosure(b) = !b
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///
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/// This rewriting implies that it is not possible to build an
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/// LTL formula object that is SYNTACTICALLY equal to one of
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/// these left expressions.
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///
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/// Note that the "![*0]" form cannot be read using the PSL
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/// grammar. Spot cannot read it either. However some
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/// BDD-based algorithm may need to negate any constant, so we
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/// handle this one as well.
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static formula* instance(type op, formula* child);
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virtual void accept(visitor& v);
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virtual void accept(const_visitor& v) const;
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/// Get the sole operand of this operator.
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const formula* child() const;
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/// Get the sole operand of this operator.
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formula* child();
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/// Get the type of this operator.
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type op() const;
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/// Get the type of this operator, as a string.
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const char* op_name() const;
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/// Return a canonic representation of the atomic proposition
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virtual std::string dump() const;
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/// Number of instantiated unary operators. For debugging.
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static unsigned instance_count();
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/// Dump all instances. For debugging.
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static std::ostream& dump_instances(std::ostream& os);
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protected:
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typedef std::pair<type, formula*> pair;
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typedef std::map<pair, unop*> map;
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static map instances;
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unop(type op, formula* child);
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virtual ~unop();
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private:
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type op_;
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formula* child_;
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};
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}
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}
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#endif // SPOT_LTLAST_UNOP_HH
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