This a bit of a weird corner-case. Consider P>0[ s=0 ] or P=?[ s=0 ].
Those are not PCTL-formula (the P-operator requires a temporal
operator) and they are not particularly useful, as we just need to
evaluate the state formula and the threshold (or turn the satisfaction
set into a quantitative result).
They can be dealt with by the LTL machinery (DA-construction, product,
...), but this is quite expensive (and not implemented yet for all
engines). So, we just deal with it by special treatment.
Conflicts:
src/storm/modelchecker/AbstractModelChecker.cpp
src/storm/modelchecker/AbstractModelChecker.h
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Requires a script ltl2da on the PATH that takes two arguments, first
an LTL formula in prefix format, second the DA automaton output
filename. E.g., it could be called via
ltl2da "& p1 F G p0" out.hoa
and should produce a complete deterministic automaton (with arbitrary
acceptance) for the LTL formula 'p1 & F (G p0)' and write it to the
out.hoa file.
Optionally, you can set the LTL2DA environment variable to provide
the path to the script, e.g., invoking storm via
LTL2DA=../ltl2da-script bin/storm ...
For PRCTL*-model checking, we need to extract the maximal state
subformulas in a path formula and substitute those with new
labels, e.g., for
(F P>0.5[...]) & G (s=0 & d=1)
we would get
(F a_1) & G a_2
as the resulting formula, with
a_1 => P>0.5[...]
a_2 => s=0 & d=1
This then allows the recursive computation of the satisfaction sets of
the maximal state subformulas and using those in the computation for
the (simplified) path formula.
We want to differentiate between a simple path formula (single G, F,
U, X, with negation over state formulas) and complex path formulas
(nested temporal operators, conjunction/disjunction, etc).
Adapt FormulaInformation and FormulaInformationVisitor accordingly.
Additionally, we tweak the FormulaInformationVisitor so that we can
optionally prohibit recursing into operator subformulas (e.g.,
P>0[...]). For PRCTL*, such subformulas are treated just as state
subformulas, and we would like to have the ability to get
FormulaInformation just for the structure of the "surface-level"
formula, without looking into the probability, long-run, reward,
... sub-formulas.
refactor FormulaInformationVisitor to support stopping recursion into nested operators and for detecting complex path formulas
Conflicts:
src/storm/logic/Formula.cpp
hannah
Tim Quatmann
Joachim Klein