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dstar: Improve conversion from DRA to BA.

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Extended former conversion from DRA->DBA to handle
the case where some SCC is not DBA-realizable.

* src/dstarparse/dra2dba.cc: Rename as...
* src/dstarparse/dra2ba.cc: ... this.
(dra_to_dba, dra_to_dba_worker): Rename as...
(dra_to_ba, dra_to_ba_worker): ... these and extend.
* src/dstarparse/Makefile.am, src/dstarparse/public.hh,
src/dstarparse/dstar2tgba.cc, src/dstarparse/nra2nba.cc: Adjust.
* NEWS: Update the description of dstar2tgba accordingly.
This commit is contained in:
Alexandre Duret-Lutz 2013-08-17 13:10:41 +02:00
parent c58bfbd2ee
commit d7027c34d3
6 changed files with 128 additions and 38 deletions
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20
src/dstarparse/public.hh
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@ -117,16 +117,23 @@ namespace spot
nra_to_nba(const dstar_aut* nra, const state_set* ignore);
/// \brief Convert a deterministic Rabin automaton into a
/// deterministic Büchi automaton when possible.
/// Büchi automaton, deterministic when possible.
///
/// See "Deterministic ω-automata vis-a-vis Deterministic Büchi
/// Automata", S. Krishnan, A. Puri, and R. Brayton (ISAAC'94) for
/// more details.
/// more details about a DRA->DBA construction.
///
/// If the DRA is DBA-realizable, return that DBA. Otherwise,
/// return NULL.
/// We essentially apply this method SCC-wise. If an SCC is
/// DBA-realizable, we duplicate it in the output, fixing just
/// the acceptance states. If an SCC is not DBA-realizable,
/// then we apply the more usual conversion from Rabin to NBA
/// for this part.
///
/// If the optional \a dba_output argument is non-null, the
/// pointed Boolean will be updated to indicate whether the
/// returned Büchi automaton is deterministic.
SPOT_API tgba*
dra_to_dba(const dstar_aut* dra);
dra_to_ba(const dstar_aut* dra, bool* dba_output = 0);
/// \brief Convert a non-deterministic Streett automaton into a
/// non-deterministic tgba.
@ -135,8 +142,7 @@ namespace spot
/// \brief Convert a Rabin or Streett automaton into a TGBA.
///
/// For DRA, this function uses dra_to_dba() when possible, or fall
/// back to nra_to_nba().
/// This function calls dra_to_ba() or nsa_to_tgba().
SPOT_API tgba*
dstar_to_tgba(const dstar_aut* dstar);