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twa: add support for very-weak property

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* spot/twa/twa.hh: Implement the property.
* spot/parseaut/parseaut.yy, spot/twaalgos/hoa.cc: Add input
and output for it.
* spot/twaalgos/strength.cc,
spot/twaalgos/strength.hh (is_very_weak_automaton): New function.
* tests/core/alternating.test: Add a test for --check=strength
on an alternating automaton.
* tests/core/strength.test, tests/core/parseaut.test: Adjust expected
output.
* NEWS, doc/org/hoa.org, doc/org/concepts.org: Document it.
This commit is contained in:
Alexandre Duret-Lutz 2016-12-01 18:27:54 +01:00
parent a4ce999402
commit 582d455c23
11 changed files with 146 additions and 33 deletions
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21
spot/twaalgos/strength.hh
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@ -60,6 +60,24 @@ namespace spot
SPOT_API bool
is_weak_automaton(const const_twa_graph_ptr& aut, scc_info* sm = nullptr);
/// \brief Check whether an automaton is very-weak.
///
/// An automaton is very-weak if in any given SCC, all transitions
/// belong to the same acceptance sets, and the SCC has only one
/// state.
///
/// \param aut the automaton to check
///
/// \param sm an scc_info object for the automaton if available (it
/// will be built otherwise).
///
/// In addition to returning the result as a Boolean, this will set
/// the prop_very_weak() and prop_weak() properties of the automaton
/// as a side-effect, so further calls will return in constant-time.
SPOT_API bool
is_very_weak_automaton(const const_twa_graph_ptr& aut,
scc_info* sm = nullptr);
/// \brief Check whether an automaton is inherently weak.
///
/// An automaton is inherently weak if in any given SCC, there
@ -90,7 +108,8 @@ namespace spot
/// \brief Check whether an automaton is weak or terminal.
///
/// This sets the "weak" and "terminal" property as appropriate.
/// This sets the "inherently weak", "weak", "very-weak" and
/// "terminal" properties as appropriate.
///
/// \param aut the automaton to check
///