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translate: add ltl-split option

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* spot/twaalgos/translate.cc, spot/twaalgos/translate.hh: Build
automata with generic acceptance by doing product of automata for
smaller subformulas.
* bin/spot-x.cc: Mention ltl-split.
* NEWS: Mention the change, and show some results.
* tests/core/genltl.test, tests/python/_product_susp.ipynb,
tests/python/highlighting.ipynb: Adjust test cases.
* doc/org/ltl2tgba.org: Update.
* tests/core/gragsa.test: Add another formula to cover more
code.
This commit is contained in:
Alexandre Duret-Lutz 2018-06-19 16:42:30 +02:00
parent 4f2e9512a2
commit 4815a361de
9 changed files with 736 additions and 499 deletions
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36
NEWS
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@ -87,6 +87,35 @@ New in spot 2.5.3.dev (not yet released)
a "suspendable" automaton B. They are also optimized for
the case that A is weak.
- When 'generic' acceptance is enabled, the translation routine will
split the input formula on Boolean operators into components that
are syntactically 'obligation', 'suspendable', or 'something
else'. Those will be translated separately and combined with
product()/product_susp(). This is inspired by the ways things are
done in ltl2dstar or delag, and can be disabled by passing option
-xltl-split=0, as in ltl2tgba -G -D -xltl-split=0. Here are the
sizes of deterministic automata produced with generic acceptance
using two versions of ltl2tgba and delag for reference.
ltl2tgba -GD rabinizer 4
2.5 2.6 delag
------------- -------------
FGa0&GFb0 5 1 1
(FGa1&GFb1)|FGa0|GFb0 8 1 1
(FGa2&GFb2)|((FGa1|GFb1)&FGa0&GFb0) 497 1 1
FGa0|GFb0 2 1 1
(FGa1|GFb1)&FGa0&GFb0 16 1 1
(FGa2|GFb2)&((FGa1&GFb1)|FGa0|GFb0) 29 1 1
GFa1 <-> GFz 4 1 1
(GFa1 & GFa2) <-> GFz 8 1 1
(GFa1 & GFa2 & GFa3) <-> GFz 21 1 1
GFa1 -> GFz 5 1 1
(GFa1 & GFa2) -> GFz 12 1 1
(GFa1 & GFa2 & GFa3) -> GFz 41 1 1
FG(a|b)|FG(!a|Xb) 4 2 2
FG(a|b)|FG(!a|Xb)|FG(a|XXb) 21 5 4
FG(a|b)|FG(!a|Xb)|FG(a|XXb)|FG(!a|XXXb) 170 15 8
- print_dot(), used to print automata in GraphViz's format,
underwent several changes:
@ -219,6 +248,13 @@ New in spot 2.5.3.dev (not yet released)
Make sure to quote %L to protect the potential commas:
genltl --format='%F,"%L",%f' ...
- In Spot 2.5 and prior running "ltl2tgba --generic --det" on some
formula would attempt to translate it as deterministic TGBA or
determinize it into an automaton with parity acceptance. Version
2.5 introduced --parity to force parity acceptance on the output.
This version finally gives --generic some more natural semantics:
any acceptance condition can be used.
New in spot 2.5.3 (2018-04-20)