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Fix a bug in scc_info, and clarify documentation

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* spot/twaalgos/sccinfo.hh, spot/twaalgos/sccinfo.cc: Implement it
* tests/python/sccinfo.py: Test it
* NEWS: Document the fix
This commit is contained in:
Maximilien Colange 2017-09-25 14:12:12 +02:00
parent d6ae7af5f5
commit 2697fcddbf
4 changed files with 71 additions and 24 deletions
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13
spot/twaalgos/sccinfo.hh
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@ -246,19 +246,21 @@ namespace spot
return trivial_;
}
/// \brief True if we are sure that the SCC is accepting
/// \brief True if we know that the SCC has an accepting cycle
///
/// Note that both is_accepting() and is_rejecting() may return
/// false if an SCC interesects a mix of Fin and Inf sets.
/// Call determine_unknown_acceptance() to decide.
bool is_accepting() const
{
return accepting_;
}
// True if we are sure that the SCC is rejecting
/// \brief True if we know that all cycles in the SCC are rejecting
///
/// Note that both is_accepting() and is_rejecting() may return
/// false if an SCC interesects a mix of Fin and Inf sets.
/// Call determine_unknown_acceptance() to decide.
bool is_rejecting() const
{
return rejecting_;
@ -295,9 +297,14 @@ namespace spot
///
/// This takes twa_graph as input and compute its SCCs. This
/// class maps all input states to their SCCs, and vice-versa.
/// It allows iterating over all SCCs of the automaton, and check
/// It allows iterating over all SCCs of the automaton, and checks
/// their acceptance or non-acceptance.
///
/// SCC are numbered in reverse topological order, i.e. the SCC of the
/// initial state has the highest number, and if s1 is reachable from
/// s2, then s1 < s2. Many algorithms depend on this property to
/// determine in what order to iterate the SCCs.
///
/// Additionally this class can be used on alternating automata, but
/// in this case, universal transitions are handled like existential
/// transitions. It still make sense to check which states belong