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// Dynamic place contents -*- c++ -*-
#ifndef PLACECONTENTS_H_
# define PLACECONTENTS_H_
# ifdef __GNUC__
# pragma interface
# endif // __GNUC__
# include "Expression.h"
/** @file PlaceContents.h
* Operation for reading the marking of a place
*/
/* Copyright 1999-2002 Marko Mkel (msmakela@tcs.hut.fi).
This file is part of MARIA, a reachability analyzer and model checker
for high-level Petri nets.
MARIA 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.
MARIA 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.
The GNU General Public License is often shipped with GNU software, and
is generally kept in a file called COPYING or LICENSE. If you do not
have a copy of the license, write to the Free Software Foundation,
59 Temple Place, Suite 330, Boston, MA 02111 USA. */
/** Place contents expression */
class PlaceContents : public Expression
{
public:
/** Constructor
* @param place the place whose marking is to be determined
*/
PlaceContents (const class Place& place);
private:
/** Copy constructor */
PlaceContents (const class PlaceContents& old);
/** Assignment operator */
class PlaceContents& operator= (const class PlaceContents& old);
protected:
/** Destructor */
~PlaceContents ();
public:
/** Determine the type of the expression */
enum Expression::Kind getKind () const { return ePlaceContents; }
/** Get the place */
const class Place& getPlace () const { return myPlace; }
/**
* Determine whether this is a basic expression containing
* no temporal logic or set operations
* @return true if this is a basic expression
*/
bool isBasic () const { return false; }
/**
* Determine whether this is a temporal logic expression
* @return true if this is a temporal logic expression
*/
bool isTemporal () const { return false; }
/**
* Determine whether this is a multiset-valued expression
* @return true if this is a multiset-valued expression
*/
bool isSet () const { return true; }
/** Equality comparison operator */
bool operator== (const class PlaceContents& other) const {
return &myPlace == &other.myPlace;
}
/** Ordering comparison operator */
bool operator< (const class PlaceContents& other) const {
return &myPlace < &other.myPlace;
}
/** Evaluate the multiset expression
* @param valuation variable substitutions and the global marking
* @return the marking of myPlace
*/
class PlaceMarking* meval (const class Valuation& valuation) const;
/** Partially evaluate the expression using a valuation
* @return grounded expression, or NULL in case of error
*/
class Expression* ground (const class Valuation&,
class Transition*, bool) { return copy (); }
/** Substitute some variables in the expression with expressions
* @return substituted expression
*/
class Expression* substitute (class Substitution&) { return copy (); }
/** Determine whether the expression depends on a set of variables
* @param vars the set of variables
* @param complement flag: treat the set as its complement
*/
bool depends (const class VariableSet& vars,
bool complement) const;
/** Perform an operation on all subexpressions of the expression
* @param operation operation to be performed (return false on failure)
* @param data parameters to be passed to the operation
* @return true if all operations succeeded
*/
bool forExpressions (bool (*operation)
(const class Expression&,void*),
void* data) const;
# ifdef EXPR_COMPILE
/** Generate C code for evaluating the expression */
void compile (class CExpression&,
unsigned,
const char*,
const class VariableSet*) const {
assert (false);
}
/** Generate C code for evaluating a multi-set expression as a scalar
* @param cexpr the compilation
* @param indent indentation level
* @param result scalar to assign the multi-set to (must be singleton)
* @param vars the variables that have been assigned a value
* @param check flag: check for result overflow
*/
void compileScalarMset (class CExpression& cexpr,
unsigned indent,
const char* result,
const class VariableSet* vars,
bool check) const;
/** Generate C code for evaluating the multi-set expression
* @param cexpr the compilation
* @param indent indentation level
* @param resulttype type of result (optional typecast qualifier)
* @param result multi-set to add items to
* @param vars the variables that have been assigned a value
*/
void compileMset (class CExpression& cexpr,
unsigned indent,
const char* resulttype,
const char* result,
const class VariableSet* vars) const;
/** Get the name of the compiled multi-set
* @param cexpr the compilation
* @return C expression referring to the multi-set
*/
char* getName (const class CExpression& cexpr) const;
# endif // EXPR_COMPILE
/** Display the expression
* @param printer the printer object
*/
void display (const class Printer& printer) const;
private:
/** The place */
const class Place& myPlace;
};
#endif // PLACECONTENTS_H_
|
