spot::random_ltl Class Reference

Generate random LTL formulae. More...

#include <spot/tl/randomltl.hh>

Inheritance diagram for spot::random_ltl:

Collaboration diagram for spot::random_ltl:

Public Member Functions
	random_ltl (const atomic_prop_set *ap)
const atomic_prop_set *	ap () const
	Return the set of atomic proposition used to build formulae. More...
formula	generate (int n) const
	Generate a formula of size n. More...
std::ostream &	dump_priorities (std::ostream &os) const
	Print the priorities of each operator, constants, and atomic propositions. More...
const char *	parse_options (char *options)
	Update the priorities used to generate the formulae. More...
bool	has_unary_ops () const
	whether we can use unary operators More...

Protected Member Functions
void	setup_proba_ ()
	random_ltl (int size, const atomic_prop_set *ap)
void	update_sums ()

Protected Attributes
unsigned	proba_size_
op_proba *	proba_
double	total_1_
op_proba *	proba_2_
double	total_2_
op_proba *	proba_2_or_more_
double	total_2_and_more_
const atomic_prop_set *	ap_

Detailed Description

Generate random LTL formulae.

This class recursively constructs LTL formulae of a given size. The formulae will use the use atomic propositions from the set of propositions passed to the constructor, in addition to the constant and all LTL operators supported by Spot.

By default each operator has equal chance to be selected. Also, each atomic proposition has as much chance as each constant (i.e., true and false) to be picked. This can be tuned using parse_options().

Constructor & Destructor Documentation

random_ltl()

spot::random_ltl::random_ltl

(

const atomic_prop_set *

ap

)

Create a random LTL generator using atomic propositions from ap.

The default priorities are defined as follows:

ap      n
false   1
true    1
not     1
F       1
G       1
X       1
equiv   1
implies 1
xor     1
R       1
U       1
W       1
M       1
and     1
or      1

Where n is the number of atomic propositions in the set passed to the constructor.

This means that each operator has equal chance to be selected. Also, each atomic proposition has as much chance as each constant (i.e., true and false) to be picked.

These priorities can be changed use the parse_options method.

Member Function Documentation

ap()

const atomic_prop_set * spot::random_formula::ap ( ) const

inlineinherited

Return the set of atomic proposition used to build formulae.

dump_priorities()

std::ostream & spot::random_formula::dump_priorities ( std::ostream &  os ) const

inherited

Print the priorities of each operator, constants, and atomic propositions.

generate()

formula spot::random_formula::generate ( int  n ) const

inherited

Generate a formula of size n.

It is possible to obtain formulae that are smaller than n, because some simple simplifications are performed by the AST. (For instance the formula a | a is automatically reduced to a by spot::multop.)

has_unary_ops()

bool spot::random_formula::has_unary_ops ( ) const

inlineinherited

whether we can use unary operators

parse_options()

const char * spot::random_formula::parse_options ( char *  options )

inherited

Update the priorities used to generate the formulae.

options should be comma-separated list of KEY=VALUE assignments, using keys from the above list. For instance "xor=0, F=3" will prevent xor from being used, and will raise the relative probability of occurrences of the F operator.

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The documentation for this class was generated from the following file:

• spot/tl/randomltl.hh