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ltlfilt: add a --max-count/-n option

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This fixes #44.

* src/bin/ltlfilt.cc: Implement -n/--max-count.
* doc/org/ltlfilt.org, src/tgbatest/randpsl.test: Use it
* NEWS: Document it.
This commit is contained in:
Alexandre Duret-Lutz 2015-01-14 18:49:00 +01:00
parent ae234d2e12
commit 8fd594f5d0
4 changed files with 53 additions and 26 deletions
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49
doc/org/ltlfilt.org
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@ -234,30 +234,29 @@ formulas that respect certain constraints. For instance let us
generate 10 formulas that are equivalent to =a U b=:
#+BEGIN_SRC sh :results verbatim :exports both
randltl -n -1 a b | ltlfilt --equivalent-to 'a U b' | head -n 10
randltl -n -1 a b | ltlfilt --equivalent-to 'a U b' -n 10
#+END_SRC
#+RESULTS:
#+begin_example
!(!a R !b)
(!Gb -> a) U b
a U b
Fb & (a W b)
((a <-> !(a | b)) W a) U ((!b M b) U b)
(b <-> (Xb M a)) -> b
(b W Fb) & ((Fb xor (a W b)) -> (a U b))
(b U (a W b)) U b
!(!b W (!a & !b))
(a M (a <-> (a xor !a))) U b
(a U b) | ((a & Xa) M Gb)
(a | b) U b
((!b U b) -> (a W b)) U b
(a xor b) U b
b R (Fb & (a U (a W b)))
(b xor !b) -> ((b W a) U b)
(!a -> ((a W b) W (a & b))) U b
(a U b) | (Ga U b)
#+end_example
The =-n -1= option to =randltl= will cause it to output an infinite
stream of random formulas. =ltlfilt=, which reads its standard input
by default, will select only those equivalent to =a U b=. The output
of =ltlfilt= would still be an infinite stream of random formulas, so
we display only the first 10 using the standard =head= utility. Less
trivial formulas could be obtained by adding the =-r= option to
=randltl= (or equivalently adding the =-r= and =-u= option to
=ltlfilt=).
of =ltlfilt= is limited to 10 formulas using =-n 10=. (As would using
=| head -n 10=.) Less trivial formulas could be obtained by adding
the =-r= option to =randltl= (or equivalently adding the =-r= and =-u=
option to =ltlfilt=).
Another similar example, that requires two calls to =ltlfilt=, is the
@ -268,20 +267,20 @@ then ignoring all syntactic safety formulas, and keeping only the
safety formulas in the remaining list.
#+BEGIN_SRC sh :results verbatim :exports both
randltl -r -n -1 a b | ltlfilt -v --syntactic-safety | ltlfilt --safety | head -n 10
randltl -r -n -1 a b | ltlfilt -v --syntactic-safety | ltlfilt --safety -n 10
#+END_SRC
#+RESULTS:
#+begin_example
(!a & Fa) R Xa
!a | (a & b) | (((!a & b) | (a & !b)) M (!a M X!a))
G(!a M Xa)
G((G!b & !a) | (a & Fb)) R a
G!a M !a
G(!a M ((!b & XGb) | (b & XF!b)))
F(b | G!b)
F(Xa | G!a)
G(XXa | (b & F!a))
G((!a & (!a M !b)) | (a & (a W b)))
G(!b | Gb | X(b & Fa))
((!a | X(!a R (!b U !a))) & X((!a & !b) | (a & b))) | (a & X(((!a & b) | (a & !b)) & (b R a)))
(F!a & (a | G!a)) R Xa
(b M XGb) W XXa
G(Xa & (!a U G!b))
(a & F!a) R X(a | b)
!a | (a & (a M !b))
b U XGb
(!a | (a R (!a | Xa))) M X!a
Ga | (!b U !a)
#+end_example