NEWS 163 KB
Newer Older
1
New in spot 2.3.4.dev (not yet released)
2

3
4
  Tools:

5
6
7
8
9
  - autfilt learned to build the union (--sum) or the intersection
    (--sum-and) of two language by putting two automata side-by-side
    and fiddling with the initial states.  This complement the already
    implemented intersection (--product) and union (--product-or),
    both based on a product.
10

11
12
  - autfilt learned to complement any alternating automaton with
    option --dualize.
Thomas Medioni's avatar
Thomas Medioni committed
13

14
15
  - genaut is a binary to produce families of automata defined in the
    literature (in the same way as we have genltl for LTL formulas).
Maximilien Colange's avatar
Maximilien Colange committed
16

17
18
19
20
  - autfilt learned --split-edges to convert labels that are Boolean
    formulas into labels that are min-terms.  (See spot::split_edges()
    below.)

21
22
  Library:

23
24
  - A new library, libspotgen, gathers all functions used to generate
    families of automata or LTL formulas, used by genltl and genaut.
25

26
  - spot::sum() and spot::sum_and() implements the union and the
27
28
29
    intersection of two automatons by putting them side-by-side and
    using non-deterministim or universal branching on the initial
    statae.
30

31
32
33
  - twa objects have a new property: prop_complete().  This obviously
    acts as a cache for the is_complete() function.

34
35
36
37
  - spot::dualize() completements any alternating automaton.  Since
    the dual of a deterministic automaton is still deterministic, the
    function spot::dtwa_complement() has been deprecated and simply
    calls spot::dualize().
38

39
40
  - spot::dtwa_complement now simply returns the result of dualize()

41
42
43
44
45
46
47
48
49
  - A new named property for automata called "original-states" can be
    used to record the origin of a state before transformation.  It is
    currently defined by the degeneralization algorithms, and by
    transform_accessible() and algorithms based on it (like
    remove_ap::strip(), decompose_strength(), decompose_scc()).  This
    is realy meant as an aid for writing algorithms that need this
    mapping, but it can also be used to debug these algorithms: the
    "original-states" information is displayed by the dot printer when
    the 'd' option is passed.  For instance in
50
51
52
53
54
55
56

      % ltl2tgba 'GF(a <-> Fb)' --dot=s
      % ltl2tgba 'GF(a <-> Fb)' | autfilt -B --dot=ds

    the second command outputs an automaton with states that show
    references to the first one.

57
58
59
60
  - A new named property for automata called "degen-levels" keeps track
    of the level of a state in a degeneralization. This information
    complements the one carried in "original-states".

61
62
63
64
65
  - A new named property for automata called "simulated-states" can be
    used to record the origin of a state through simulation. The
    behavior is similar to "original-states" above. Determinization
    takes advantage of this in its pretty print.

66
67
68
69
70
71
  - The new function spot::acc_cond::is_streett_like() checks whether
    an acceptance condition is conjunction of disjunctive clauses
    containing at most one Inf and at most one Fin.  It builds a
    vector of pairs to use if we want to assume the automaton has
    Streett acceptance.  The dual function is
    spot::acc_cond::is_rabin_like() works similarly.
72

73
74
75
76
77
  - The degeneralize() function has learned to consider acceptance
    marks common to all edges comming to a state to select its initial
    level.  A similar trick was already used in sbacc(), and saves a
    few states in some cases.

78
79
80
81
82
83
84
  - There is a new spot::split_edges() function that transforms edges
    (labeled by Boolean formulas over atomic propositions) into
    transitions (labeled by conjunctions where each atomic proposition
    appear either positive or negative).  This can be used to
    preprocess automata before feeding them to algorithms or tools
    that expect transitions labeled by letters.

85
86
87
  - spot::scc_info has two new methods to easily iterate over the
    edges of an SCC: edges_of() and inner_edges_of().

88
89
90
  - spot::scc_info can now be passed a filter function to ignore
    or cut some edges.

91
92
93
94
95
  - spot::scc_info now keeps track of acceptance sets that are common
    to all edges in an SCC.  These can be retrieved using
    scc_info::common_sets_of(scc), and they are used by scc_info to
    classify some SCCs as rejecting more easily.

96
97
98
99
100
101
  - The new function acc_code::remove() removes all the given
    acceptance sets from the acceptance condition.

  - It is now possible to change an automaton acceptance condition
    directly by calling twa::set_acceptance().

102
103
104
105
106
  - spot::cleanup_acceptance_here now takes an additional boolean
    parameter specifying whether to strip useless marks from the
    automaton.  This parameter is defaulted to true, in order to
    keep this modification backward-compatible.

107
108
  Python:

109
110
  - The 'spot.gen' package exports the functions from libspotgen.
    See https://spot.lrde.epita.fr/ipynb/gen.html for examples.
111

112
113
114
115
  - twa_graph::copy_state_names_from() can be used to copy the state
    names from another automaton, honoring "original-states" if
    present.

116
117
118
119
120
121
  Bugs fixed:

  - We have fixed new cases where translating multiple formula in a
    single ltl2tgba run could produce automata different from those
    produced by individual runs.

122
123
124
125
126
  - The print_dot() function had a couple of issues when printing
    alternating automata: in particular, when using flag 's' (display
    SCC) or 'y' (split universal destination by colors) universal
    edges could be connected to undefined states.

127
128
129
130
131
132
133
134
135
136
  Backward-incompatible changes:

  - spot::acc_cond::mark_t::operator bool() has been marked as
    explicit.  The implicit converion to bool (and, via bool, to int)
    was a source of bugs.

  - spot::twa_graph::set_init_state(const state*) has been removed.
    It was never used.  You always want to use
    spot::twa_graph::set_init_state(unsigned) in practice.

137
138
139
140
141
142
143
  - The previous implementation of spot::is_deterministic() has been
    renamed to spot::is_universal().  The new version of
    spot::is_deterministic() requires the automaton to be both
    universal and existential.  This should not make any difference in
    existing code unless you work with the recently added support for
    alternating automata.

144
145
146
  - spot::acc_cond::mark_t::sets() now returns an internal iterable
    object instead of an std::vector<unsigned>.

147
148
  Deprecation notice:

149
150
151
152
153
154
155
156
  - spot::dtwa_complement() is deprecated.  Prefer the more generic
    spot::dualize() instead.

  - The spot::twa::prop_deterministic() methods have been renamed to
    spot::twa::prop_universal() for consistency with the change to
    is_deterministic() listed above.  We have kept
    spot::twa::prop_deterministic() as a deprecated synonym for
    spot::twa::prop_universal() to help backward compatibility.
157

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
158
New in spot 2.3.4 (2017-05-11)
159

160
161
  Bugs fixed:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
162
  - The transformation to state-based acceptance (spot::sbacc()) was
163
    incorrect on automata where the empty acceptance mark is accepting.
164

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
165
  - The --help output of randaut and ltl2tgba was showing an
166
167
    unsupported %b stat.

168
169
170
  - ltldo and ltlcross could leave temporary files behind when
    aborting on error.

171
172
173
174
  - The LTL simplifcation rule that turns F(f)|q into F(f|q)
    when q is a subformula that is both eventual and universal
    was documented but not applied in some forgotten cases.

175
176
177
178
  - Because of some caching inside of ltl2tgba, translating multiple
    formula in single ltl2tgba run could produce automata different
    from those produced by individual runs.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
179
New in spot 2.3.3 (2017-04-11)
180

181
182
183
184
185
  Tools:

  - ltldo and ltlcross learned shorthands to talk to ltl2da, ltl2dpa,
    and ltl2ldba (from Owl) without needing to specify %f>%O.

186
  - genltl learned --spec-patterns as an alias for --dac-patterns; it
187
188
189
    also learned two new sets of LTL formulas under --hkrss-patterns
    (a.k.a. --liberouter-patterns) and --p-patterns
    (a.k.a. --beem-patterns).
190

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
191
  Bugs fixed:
192

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
193
194
  - In "lenient" mode the formula parser would fail to recover from a
    missing closing brace.
195

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
196
197
  - The output of 'genltl --r-left=1 --r-right=1 --format=%F' had
    typos.
198

199
200
201
202
  - 'ltl2tgba Fa | autfilt --complement' would incorrectly claim that
    the output is "terminal" because dtwa_complement() failed to reset
    that property.

203
204
205
  - spot::twa_graph::purge_unreachable_states() was misbehaving on
    alternating automata.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
206
207
  - In bench/stutter/ the .cc files were not compiling due to warnings
    being caught as errors.
208

209
210
211
212
213
214
  - The code in charge of detecting DBA-type Rabin automata is
    actually written to handle a slightly larger class of acceptance
    conditions (e.g., Fin(0)|(Fin(1)&Inf(2))), however it failed to
    correctly detect DBA-typeness in some of these non-Rabin
    acceptance.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
215
New in spot 2.3.2 (2017-03-15)
216

217
218
  Tools:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
219
  - In tools that output automata, the number of atomic propositions
220
    can be output using --stats=%x (output automaton) or --stats=%X
221
    (input automaton).  Additional options can be passed to list
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
222
    atomic propositions instead of counting them.  Tools that output
223
    formulas also support --format=%x for this purpose.
224

225
226
  Python:

227
228
  - The bdd_to_formula(), and to_generalized_buchi() functions can now
    be called in Python.
229

230
231
232
233
234
  Documentation:

  - https://spot.lrde.epita.fr/tut11.html is a new page describing
    how to build monitors in Shell, Python, or C++.

235
236
237
238
239
  Bugs fixed:

  - The tests using LTSmin's patched version of divine would fail
    if the current (non-patched) version of divine was installed.

240
241
242
  - Because of a typo, the output of --stats='...%P...' was correct
    only if %p was used as well.

243
244
245
  - genltl was never meant to have (randomly attributed) short
    options for --postive and --negative.

246
247
248
249
  - a typo in the code for transformating transition-based acceptance
    to state-based acceptance could cause a superfluous initial state
    to be output in some cases (the result was still correct).

250
251
  - 'ltl2tgba --any -C -M ...' would not complete automata.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
252
  - While not incorrect, the HOA properties output by 'ltl2tgba -M'
253
254
255
256
    could be 'inherently-weak' or 'terminal', while 'ltl2tgba -M -D'
    would always report 'weak' automata.  Both variants now report the
    most precise between 'weak' or 'terminal'.

257
258
259
  - spot::twa_graph::set_univ_init_state() could not be called with
    an initializer list.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
260
  - The Python wrappers for spot::twa_graph::state_from_number and
261
262
    spot::twa_graph::state_acc_sets were broken in 2.3.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
263
  - Instantiating an emptiness check on an automaton with unsupported
264
265
266
267
    acceptance condition should throw an exception.  This used to be
    just an assertion, disabled in release builds; the difference
    matters for the Python bindings.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
268
  Deprecation notice:
269
270
271
272

  - Using --format=%a to print the number of atomic propositions in
    ltlfilt, genltl, and randltl still works, but it is not documented
    anymore and should be replaced by the newly-introduced --format=%x
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
273
274
    for consistency with tools producing automata, where %a means
    something else.
275

276

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
277
New in spot 2.3.1 (2017-02-20)
278

279
280
281
282
283
284
  Tools:

  - ltldo learnt to act like a portfolio: --smallest and --greatest
    will select the best output automaton for each formula translated.
    See https://spot.lrde.epita.fr/ltldo.html#portfolio for examples.

285
286
287
  - The colors used in the output of ltlcross have been adjusted to
    work better with white backgrounds and black backgrounds.

288
289
290
  - The option (y) has been added to --dot. It splits the universal
    edges with the same targets but different colors.

291
292
293
294
295
  - genltl learnt three new families for formulas: --kr-n2=RANGE,
    --kr-nlogn=RANGE, and --kr-n=RANGE.  These formulas, from
    Kupferman & Rosenberg [MoChArt'10] are recognizable by
    deterministic Büchi automata with at least 2^2^n states.

296
297
298
299
300
  - autfilt has a new transformation: --decompose-scc, which allows
    decomposition of automata through their accepting SCCs.
    A demonstration of this feature via the Python bindings
    can be found at https://spot.lrde.epita.fr/ipynb/decompose.html

301
302
303
304
  Library:

  - spot::twa_run::as_twa() has an option to preserve state names.

305
306
307
308
  - the method spot::twa::is_alternating(), introduced in Spot 2.3 was
    badly named and has been deprecated.  Use the negation of the new
    spot::twa::is_existential() instead.

309
310
311
312
313
314
315
  Bugs fixed:

  - spot::otf_product() was incorrectly registering atomic
    propositions.

  - spot::ltsmin_model::kripke() forgot to register the "dead"
    proposition.
316

317
318
319
320
321
322
  - The spot::acc_word type (used to construct acceptance condition)
    was using some non-standard anonymous struct.  It is unlikely that
    this type was actually used outside Spot, but if you do use it,
    spot::acc_word::op and spot::acc_word::type had to be renamed as
    spot::acc_word::sub.op and spot::acc_word::sub.type.

323
324
325
  - alternation_removal() was not always reporting the unsupported
    non-weak automata.

326
327
328
329
  - a long-standing typo in the configure code checking for Python
    caused any user-defined CPPFLAGS to be ignored while building
    Spot.

330
331
332
333
  - The display of clusters with universal edges was confused, because the
    intermediate node was not in the cluster even if one of the target was
    in the same one.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
334
New in spot 2.3 (2017-01-19)
335

336
337
338
339
340
341
342
343
344
345
346
  Build:

  * While Spot only relies on C++11 features, the configure script
    learned --enable-c++14 to compile in C++14 mode.  This allows us
    check that nothing breaks when we will switch to C++14.

  * Spot is now distributed with PicoSAT 965, and uses it for
    SAT-based minimization of automata without relying on temporary
    files.  It is still possible to use an external SAT solver by
    setting the SPOT_SATSOLVER environment variable.

347
348
349
  * The development Debian packages for Spot now install static
    libraries as well.

350
351
  * We now install configuration files for users of pkg-config.

352
353
  Tools:

354
355
356
  * ltlcross supports translators that output alternating automata in
    the HOA format.  Cross-comparison checks will only work with weak
    alternating automata (not necessarily *very* weak), but "ltlcross
357
358
    --no-check --product=0 --csv=..." will work with any alternating
    automaton if you just want satistics.
359

360
361
362
363
364
365
  * autfilt can read alternating automata.  This is still experimental
    (see below). Some of the algorithms proposed by autfilt will
    refuse to work because they have not yet been updated to work with
    alternating automata, but in any case they should display a
    diagnostic: if you see a crash, please report it.

366
367
368
  * autfilt has three new filters: --is-very-weak, --is-alternating,
    and --is-semi-deterministic.

369
370
  * the --check option of autfilt/ltl2tgba/ltldo/dstar2tgba can now
    take "semi-determinism" as argument.
371

372
  * autfilt --highlight-languages will color states that recognize
373
    identical languages.  (Only works for deterministic automata.)
374

375
376
377
378
379
  * 'autfilt --sat-minimize' and 'ltl2tgba -x sat-minimize' have
    undergone some backward incompatible changes.  They use binary
    search by default, and support different options than they used
    too.  See spot-x(7) for details.  The defaults are those that were
    best for the benchmark in bench/dtgbasat/.
380

381
382
383
384
  * ltlfilt learned --recurrence and --persistence to match formulas
    belonging to these two classes of the temporal hierarchy.  Unlike
    --syntactic-recurrence and --syntactic-persistence, the new checks
    are automata-based and will also match pathological formulas.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
385
    See https://spot.lrde.epita.fr/hierarchy.html
386

387
  * The --format option of ltlfilt/genltl/randltl/ltlgrind learned to
388
    print the class of a formula in the temporal hierarchy of Manna &
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
389
    Pnueli using %h.  See https://spot.lrde.epita.fr/hierarchy.html
390

391
392
393
394
395
396
  * ltldo and ltlcross learned a --relabel option to force the
    relabeling of atomic propositions to p0, p1, etc.  This is more
    useful with ltldo, as it allows calling a tool that restricts the
    atomic propositions it supports, and the output automaton will
    then be fixed to use the original atomic propositions.

397
398
399
  * ltldo and ltlcross have learned how to call ltl3hoa, so
    'ltl3hoa -f %f>%O' can be abbreviated to just 'ltl3hoa'.

400
401
402
  Library:

  * A twa is required to have at least one state, the initial state.
403
404
    An automaton can only be empty while it is being constructed,
    but should not be passed to other algorithms.
405

406
  * Couvreur's emptiness check has been rewritten to use the explicit
407
408
    interface when possible, to avoid overkill memory allocations.
    The new version has further optimizations for weak and terminal
409
410
411
    automata.  Overall, this new version is roughly 4x faster on
    explicit automata than the former one.  The old version has been
    kept for backward compatibility, but will be removed eventually.
412

413
  * The new version of the Couvreur emptiness check is now the default
414
415
    one, used by twa::is_empty() and twa::accepting_run().  Always
    prefer these functions over an explicit call to Couvreur.
416

417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
  * experimental support for alternating automata:

    - twa_graph objects can now represent alternating automata.  Use
      twa_graph::new_univ_edge() and twa_graph::set_univ_init_state()
      to create universal edges an initial states; and use
      twa_graph::univ_dests() to iterate over the universal
      destinations of an edge.

    - the automaton parser will now read alternating automata in the
      HOA format.  The HOA and dot printers can output them.

    - the file twaalgos/alternation.hh contains a few algorithms
      specific to alternating automata:
      + remove_alternation() will transform *weak* alternating automata
        into TGBA.
      + the class outedge_combiner can be used to perform "and" and "or"
        on the outgoing edges of some alternating automaton.

435
    - scc_info has been adjusted to handle universal edges as if they
436
437
438
      were existential edges.  As a consequence, acceptance
      information is not accurate.

439
440
441
442
443
444
445
    - postprocessor will call remove_alternation() right away, so
      it can be used as a way to transform alternating automata
      into different sub-types of (generalized) Büchi automata.
      Note that although prostprocessor optimize the resulting
      automata, it still has no simplification algorithms that work
      at the alternating automaton level.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
446
447
448
    - See https://spot.lrde.epita.fr/tut23.html
      https://spot.lrde.epita.fr/tut24.html and
      https://spot.lrde.epita.fr/tut31.html for some code examples.
449

450
451
452
453
  * twa objects have two new properties, very-weak and
    semi-deterministic, that can be set or retrieved via
    twa::prop_very_weak()/twa::prop_semi_deterministic(), and that can
    be tested by is_very_weak_automaton()/is_semi_deterministic().
454

455
456
457
458
459
460
  * twa::prop_set has a new attribute used in twa::prop_copy() and
    twa::prop_keep() to indicate that determinism may be improved by
    an algorithm.  In other words properties like
    deterministic/semi-deterministic/unambiguous should be preserved
    only if they are positive.

461
  * language_map() and highlight_languages() are new functions that
462
    implement autfilt's --highlight-languages option mentionned above.
463

464
  * dtgba_sat_minimize_dichotomy() and dwba_sat_minimize_dichotomy()
465
    use language_map() to estimate a lower bound for binary search.
466

467
  * The encoding part of SAT-based minimization consumes less memory.
468

469
470
471
472
  * SAT-based minimization of automata can now be done using two
    incremental techniques that take a solved minimization and attempt
    to forbid the use of some states.  This is done either by adding
    clauses, or by using assumptions.
473

474
475
476
477
  * If the environment variable "SPOT_XCNF" is set during incremental
    SAT-based minimization, XCNF files suitable for the incremental SAT
    competition will be generated.  This requires the use of an exteral
    SAT solver, setup with "SPOT_SATSOLVER".  See spot-x(7).
478

479
480
481
  * The new function mp_class(f) returns the class of the formula
    f in the temporal hierarchy of Manna & Pnueli.

482
483
484
485
486
487
488
489
490
Python:

  * spot.show_mp_hierarchy() can be used to display the membership of
    a formula to the Manna & Pnueli hierarchy, in notebooks.  An
    example is in https://spot.lrde.epita.fr/ipynb/formulas.html

  * The on-line translator will now display the temporal hierarchy
    in the "Formula > property information" output.

491
Bugs fixed:
492
493
494
495
496
497
498
499

  * The minimize_wdba() function was not correctly minimizing automata
    with useless SCCs.  This was not an issue for the LTL translation
    (where useless SCCs are always removed first), but it was an issue
    when deciding if a formula was safety or guarantee.  As a
    consequence, some tricky safety or guarantee properties were only
    recognized as obligations.

500
501
502
503
  * When ltlcross was running a translator taking the Spin syntax as
    input (%s) it would not automatically relabel any unsupported
    atomic propositions as ltldo already do.

504
505
506
507
  * When running "autfilt --sat-minimize" on a automaton representing
    an obligation property, the result would always be a complete
    automaton even without the -C option.

508
509
510
  * ltlcross --products=0 --csv should not output any product-related
    column in the CSV output since it has nothing to display there.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
511
New in spot 2.2.2 (2016-12-16)
512

513
514
515
516
517
  Build:

  * If the system has an installed libltdl library, use it instead of
    the one we distribute.

518
519
520
521
  Bug fixes:

  * scc_filter() had a left-over print statement that would print
    "names" when copying the name of the states.
522

523
524
525
526
527
  * is_terminal() should reject automata that have accepting
    transitions going into rejecting SCCs.  The whole point of
    being a terminal automaton is that reaching an accepting
    transition guarantees that any suffix will be accepted.

528
529
530
531
532
  * The HOA parser incorrectly read "Acceptance: 1 Bar(0)" as a valid
    way to specify "Acceptance: 1 Fin(0)" because it assumed that
    everything that was not Inf was Fin.  These errors are now
    diagnosed.

533
534
535
536
  * Some of the installed headers (spot/misc/fixpool.hh,
    spot/misc/mspool.hh, spot/twaalgos/emptiness_stats.hh) were not
    self-contained.

537
538
539
  * ltlfilt --from-ltlf should ensure that "alive" holds initially in
    order to reject empty traces.

540
541
542
  * the on-line translator had a bug where a long ltl3ba process would
    continue running even after the script had timeout'ed.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
543
New in spot 2.2.1 (2016-11-21)
544

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
545
  Bug fix:
546

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
547
548
  * The bdd_noderesize() function, as modified in 2.2, would always
    crash.
549

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
550
New in spot 2.2 (2016-11-14)
551

552
553
554
555
556
557
  Command-line tools:

  * ltlfilt has a new option --from-ltlf to help reducing LTLf (i.e.,
    LTL over finite words) model checking to LTL model checking.  This
    is based on a transformation by De Giacomo & Vardi (IJCAI'13).

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
558
559
560
561
  * "ltldo --stats=%R", which used to display the serial number of the
    formula processed, was renamed to "ltldo --stats=%#" to free %R
    for the following feature.

562
563
564
  * autfilt, dstar2tgba, ltl2tgba, ltlcross, ltldo learned to measure
    cpu-time (as opposed to wall-time) using --stats=%R.  User or
    system time, for children or parent, can be measured separately by
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
565
566
567
568
    adding additional %[LETTER]R options.  The difference between %r
    (wall-clock time) and %R (CPU time) can also be used to detect
    unreliable measurements.  See
      https://spot.lrde.epita.fr/oaut.html#timing
569

570
571
  Library:

572
573
574
  * from_ltlf() is a new function implementing the --from-ltlf
    transformation described above.

575
  * is_unambiguous() was rewritten in a more efficient way.
576

577
  * scc_info learned to determine the acceptance of simple SCCs made
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
578
    of a single self-loop without resorting to remove_fin() for complex
579
580
581
582
583
584
    acceptance conditions.

  * remove_fin() has been improved to better deal with automata with
    "unclean" acceptance, i.e., acceptance sets that are declared but
    not used.  In particular, this helps scc_info to be more efficient
    at deciding the acceptance of SCCs in presence of Fin acceptance.
585

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
586
587
  * Simulation-based reductions now implement just bisimulation-based
    reductions on deterministic automata, to save time.  As an example,
588
589
590
    this halves the run time of
       genltl --rv-counter=10 | ltl2tgba

591
592
  * scc_filter() learned to preserve state names and highlighted states.

593
594
595
596
597
  * The BuDDy library has been slightly optimized: the initial setup
    of the unicity table can now be vectorized by GCC, and all calls
    to setjmp are now avoided when variable reordering is disabled
    (the default).

598
599
600
601
602
603
604
605
  * The twa class has three new methods:
      aut->intersects(other)
      aut->intersecting_run(other)
      aut->intersecting_word(other)
    currently these are just convenient wrappers around
      !otf_product(aut, other)->is_empty()
      otf_product(aut, other)->accepting_run()->project(aut)
      otf_product(aut, other)->accepting_word()
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
606
607
608
    with any Fin-acceptance removal performed before the product.
    However the plan is to implement these more efficiently in the
    future.
609

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
610
  Bug fixes:
611

612
  * ltl2tgba was always using the highest settings for the LTL
613
614
615
616
    simplifier, ignoring the --low and --medium options.  Now
      genltl --go-theta=12 | ltl2tgba --low --any
    is instantaneous as it should be.

617
618
619
  * The int-vector compression code could encode 6 and 22 in the
    same way, causing inevitable issues in our LTSmin interface.
    (This affects tests/ltsmin/modelcheck with option -z, not -Z.)
620

621
622
623
  * str_sere() and str_utf8_sere() were not returning the same
    string that print_sere() and print_utf8_sere() would print.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
624
  * Running the LTL parser in debug mode would crash.
625

626
  * tgba_determinize() could produce incorrect deterministic automata
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
627
    when run with use_simulation=true (the default) on non-simplified
628
629
    automata.

630
631
  * When the automaton_stream_parser reads an automaton from an
    already opened file descriptor, it will not close the file
632
633
634
635
    anymore.  Before that the spot.automata() python function used to
    close a file descriptor twice when reading from a pipe, and this
    led to crashes of the 0MQ library used by Jupyter, killing the
    Python kernel.
636

637
638
639
  * remove_fin() could produce incorrect result on incomplete
    automata tagged as weak and deterministic.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
640
641
642
  * calling set_acceptance() several times on an automaton could
    result in unexpected behaviors, because set_acceptance(0,...)
    used to set the state-based acceptance flag automatically.
643

644
  * Some buffering issue caused syntax errors to be displayed out
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
645
    of place by the on-line translator.
646

647
New in spot 2.1.2 (2016-10-14)
648

649
650
651
652
653
654
  Command-line tools:

  * genltl learned 5 new families of formulas
    (--tv-f1, --tv-f2, --tv-g1, --tv-g2, --tv-uu)
    defined in Tabakov & Vardi's RV'10 paper.

655
656
657
658
659
660
  * ltlcross's --csv and --json output was changed to not include
    information about the ambiguity or strength of the automata by
    default.   Computing those can be costly and not needed by
    every user, so it should now be requested explicitely using
    options --strength and --ambiguous.

661
662
663
664
665
666
667
668
  Library:

  * New LTL simplification rule:

    - GF(f & q) = G(F(f) & q) if q is
      purely universal and a pure eventuality.  In particular
      GF(f & GF(g)) now ultimately simplifies to G(F(f) & F(g)).

669
670
  Bug fixes:

671
  * Fix spurious uninitialized read reported by valgrind when
672
    is_Kleene_star() is compiled by clang++.
673

674
  * Using "ltlfilt some-large-file --some-costly-filter" could take
675
676
677
678
679
680
681
    to a lot of time before displaying the first results, because the
    output of ltlfilt is buffered: the buffer had to fill up before
    being flushed.  The issue did not manifest when the input is
    standard input, because of the C++ feature that reading std::cin
    should flush std::cout; however it was well visible when reading
    from files.  Flushing is now done more regularly.

682
683
684
685
  * Fix compilation warnings when -Wimplicit-fallthrough it enabled.

  * Fix python errors on Darwin when using methods from the spot module
    inside of the spot.ltsmin submodule.
686

687
688
  * Fix ltlcross crash when combining --no-check with --verbose.

689
690
691
  * Adjust paths and options used in bench/dtgbasat/ to match the
    changes introduced in Spot 2.0.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
692
New in spot 2.1.1 (2016-09-20)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
693

694
695
696
  Command-line tools:

  * ltlfilt, randltl, genltl, and ltlgrind learned to display the size
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
697
    (%s), Boolean size (%b), and number of atomic propositions (%a)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
698
699
    with the --format and --output options.  A typical use-case is to
    sort formulas by size:
700
701
702
703
       genltl --dac --format='%s,%f' | sort -n | cut -d, -f2
    or to group formulas by number of atomic propositions:
       genltl --dac --output='ap-%a.ltl'

704
705
706
  * autfilt --stats learned the missing %D, %N, %P, and %W sequences,
    to complete the existing %d, %n, %p, and %w.

707
  * The --stats %c option of ltl2tgba, autfilt, ltldo, and dstar2tgba
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
708
    now accepts options to filter the SCCs to count.  For instance
709
710
711
    --stats='%[awT]c' will count the SCCs that are (a)ccepting and
    (w)eak, but (not t)erminal.  See --help for all supported filters.

712
713
714
  Bugs fixed:

  * Fix several cases where command-line tools would fail to diagnose
715
    write errors (e.g. when writing to a filesystem that is full).
716
  * Typos in genltl --help and in the man page spot-x(7).
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
717

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
718
New in spot 2.1 (2016-08-08)
719

720
721
  Command-line tools:

722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
  * All tools that input formulas or automata (i.e., autfilt,
    dstar2tgba, ltl2tgba, ltl2tgta, ltlcross, ltldo, ltlfilt,
    ltlgrind) now have a more homogeneous handling of the default
    input.

    - If no formula/automaton have been specified, and the standard
    input is a not a tty, then the default is to read that. This is a
    change for ltl2tgba and ltl2tgta.  In particular, it simplifies

        genltl --dac | ltl2tgba -F- | autfilt ...

    into

        genltl --dac | ltl2tgba | autfilt ...

    - If standard input is a tty and no other input has been
    specified, then an error message is printed.  This is a change for
    autfilt, dstar2tgba, ltlcross, ltldo, ltlfilt, ltlgrind, that used
    to expect the user to type formula or automata at the terminal,
    confusing people.

    - All tools now accept - as a shorthand for -F-, to force reading
    input from the standard input (regardless of whether it is a tty
    or not).  This is a change for ltl2tgba, ltl2tgta, ltlcross, and
    ltldo.

748
749
750
  * ltldo has a new option --errors=... to specify how to deal
    with errors from executed tools.

751
752
  * ltlcross and ltldo learned to bypass the shell when executing
    simple commands (with support for single or double-quoted
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
    arguments, and redirection of stdin and stdout, but nothing more).

  * ltlcross and ltldo learned a new syntax to specify that an input
    formula should be written in some given syntax after rewriting
    some operators away.  For instance the defaults arguments passed
    to ltl2dstar have been changed from
         --output-format=hoa %L %O
    into
         --output-format=hoa %[WM]L %O
    where [WM] specifies that operators W and M should be rewritten
    away.  As a consequence running
         ltldo ltl2dstar -f 'a M b'
    will now work and call ltl2dstar on the equivalent formula
    'b U (a & b)' instead.  The operators that can be listed between
    brackets are the same as those of ltlfilt --unabbreviate option.

  * ltlcross learned to show some counterexamples when diagnosing
    failures of cross-comparison checks against random state spaces.
771

772
773
  * autfilt learned to filter automata by count of SCCs (--sccs=RANGE)
    or by type of SCCs (--accepting-sccs=RANGE,
774
775
776
    --rejecting-sccs=RANGE, trivial-sccs=RANGE, --terminal-sccs=RANGE,
    --weak-sccs=RANGE, --inherently-weak-sccs=RANGE).

777
  * autfilt learned --remove-unused-ap to remove atomic propositions
778
779
    that are declared in the input automaton, but not actually used.
    This of course makes sense only for input/output formats that
780
    declare atomic propositions (HOA & DSTAR).
781

782
  * autfilt learned two options to filter automata by count of used or
783
784
785
786
    unused atomic propositions: --used-ap=RANGE --unused-ap=RANGE.
    These differ from --ap=RANGE that only consider *declared* atomic
    propositions, regardless of whether they are actually used.

787
788
  * autfilt learned to filter automata by count of nondeterministsic
    states with --nondet-states=RANGE.
789

790
  * autfilt learned to filter automata representing stutter-invariant
791
792
    properties with --is-stutter-invariant.

793
  * autfilt learned two new options to highlight non-determinism:
794
    --highlight-nondet-states=NUM and --highlight-nondet-states=NUM
795
796
    where NUM is a color number.  Additionally --highlight-nondet=NUM is
    a shorthand for using the two.
797

798
  * autfilt learned to highlight a run matching a given word using the
799
800
801
    --highlight-word=[NUM,]WORD option.  However currently this only
    work on automata with Fin-less acceptance.

802
803
804
  * autfilt learned two options --generalized-rabin and
    --generalized-streett to convert the acceptance conditions.

805
  * genltl learned three new families: --dac-patterns=1..45,
806
807
808
    --eh-patterns=1..12, and --sb-patterns=1..27.  Unlike other options
    these do not output scalable patterns, but simply a list of formulas
    appearing in these three papers: Dwyer et al (FMSP'98), Etessami &
809
    Holzmann (Concur'00), Somenzi & Bloem (CAV'00).
810

811
812
  * genltl learned two options, --positive and --negative, to control
    wether formulas should be output after negation or not (or both).
813

814
815
816
817
818
819
820
821
822
823
824
825
826
  * The formater used by --format (for ltlfilt, ltlgrind, genltl,
    randltl) or --stats (for autfilt, dstar2tgba, ltl2tgba, ltldo,
    randaut) learned to recognize double-quoted fields and double the
    double-quotes output inbetween as expected from RFC4180-compliant
    CSV files.  For instance
      ltl2tgba -f 'a U "b+c"' --stats='"%f",%s'
    will output
      "a U ""b+c""",2

  * The --csv-escape option of genltl, ltlfilt, ltlgrind, and randltl
    is now deprecated.  The option is still here, but hidden and
    undocumented.

827
828
  * The --stats option of autfilt, dstar2tgba, ltl2tgba, ltldo,
    randaut learned to display the output (or input if that makes
829
    sense) automaton as a HOA one-liner using %h (or %H), helping to
830
831
    create CSV files contained automata.

832
833
834
835
  * autfilt and dstar2tgba learned to read automata from columns in
    CSV files, specified using the same filename/COLUMN syntax used by
    tools reading formulas.

836
837
838
  * Arguments passed to -x (in ltl2tgba, ltl2tgta, autfilt, dstar2tgba)
    that are not used are now reported as they might be typos.
    This ocurred a couple of times in our test-suite.  A similar
839
    check is done for the arguments of autfilt --sat-minimize=...
840

841
842
843
844
845
846
847
848
849
  Library:

  * The print_hoa() function will now output version 1.1 of the HOA
    format when passed the "1.1" option (i.e., use -H1.1 from any
    command-line tool).  As far as Spot is concerned, this allows
    negated properties to be expressed.  Version 1 of the HOA format
    is still the default, but we plan to default to version 1.1 in the
    future.

850
851
852
853
854
855
856
  * The "highlight-states" and "highlight-edges" named properties,
    which were introduced in 1.99.8, will now be output using
    "spot.highlight.edges:" and "spot.highlight.states:" headers if
    version 1.1 of the HOA format is selected.  The automaton parser
    was secretly able of reading that since 1.99.8, but that is now
    documented at https://spot.lrde.epita.fr/hoa.html#extensions

857
858
859
  * highlight_nondet_states() and highlight_nondet_edges() are
    new functions that define the above two named properties.

860
  * is_deterministic(), is_terminal(), is_weak(), and
861
862
863
    is_inherently_weak(), count_nondet_states(),
    highlight_nondet_edges(), highlight_nondet_states() will update
    the corresponding properties of the automaton as a side-effect of
864
    their check.
865

866
867
868
869
870
871
  * the sbacc() function, used by "ltl2tgba -S" and "autfilt -S" to
    convert automata to state-based acceptance, learned some tricks
    (using SCCs, pulling accepting marks common to all outgoing edges,
    and pushing acceptance marks common to all incoming edges) to
    reduce the number of additional states needed.

872
873
874
875
  * to_generalized_rabin() and to_generalized_streett() are two new
    functions that convert the acceptance condition as requested
    without changing the transition structure.

876
877
878
  * language_containment_checker now has default values for all
    parameters of its constructor.

879
880
881
882
  * spot::twa_run has a new method, project(), that can be used to
    project a run found in a product onto one of the original operand.
    This is for instance used by autfilt --highlight-word.

883
884
885
886
    The old spot::project_twa_run() function has been removed: it was
    not used anywhere in Spot, and had an obvious bug in its
    implementation, so it cannot be missed by anyone.

887
888
  * spot::twa has two new methods that supplement is_empty():
    twa::accepting_run() and twa::accepting_word().  They compute
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
889
    what their names suggest.  Note that twa::accepting_run(), unlike
890
891
892
    the two others, is currently restricted to automata with Fin-less
    acceptance.

893
894
895
896
897
  * spot::check_stutter_invariance() can now work on non-deterministic
    automata for which no corresponding formula is known.  This
    implies that "autfilt --check=stutter" will now label all
    automata, not just deterministic automata.

898
  * New LTL and PSL simplification rules:
899
900
    - if e is pure eventuality and g => e, then e U g = Fg
    - if u is purely universal and u => g, then u R g = Gg
901
902
    - {s[*0..j]}[]->b = {s[*1..j]}[]->b
    - {s[*0..j]}<>->b = {s[*1..j]}<>->b
903

904
905
906
907
  * spot::twa::succ_iterable renamed to
    spot::internal::twa_succ_iterable to make it clear this is not for
    public consumption.

908
909
910
911
912
  * spot::fair_kripke::state_acceptance_conditions() renamed to
    spot::fair_kripke::state_acceptance_mark() for consistency.  This
    is backward incompatible, but we are not aware of any actual use
    of this method.

913
914
  Python:

915
  * The __format__() method for formula supports the same
916
917
918
919
    operator-rewritting feature introduced in ltldo and ltlcross.
    So "{:[i]s}".format(f) is the same as
    "{:s}".format(f.unabbreviate("i")).

920
921
  * Bindings for language_containment_checker were added.

922
923
  * Bindings for randomize() were added.

924
925
926
  * Iterating over edges via "aut.out(s)" or "aut.edges()"
    now allows modifying the edge fields.

927
  * Under IPython the spot.ltsmin module now offers a
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
928
    %%pml magic to define promela models, compile them
929
930
931
    with spins, and dynamically load them.   This is
    akin to the %%dve magic that was already supported.

932
933
934
935
  * The %%dve and %%pml magics honor the SPOT_TMPDIR and
    TMPDIR environment variables.  This especially helps
    when the current directory is read-only.

936
937
938
939
  Documentation:

  * A new example page shows how to test the equivalence of
    two LTL/PSL formulas.  https://spot.lrde.epita.fr/tut04.html
940

941
942
  * A new page discusses explicit vs. on-the-fly interfaces for
    exploring automata in C++.  https://spot.lrde.epita.fr/tut50.html
943

944
  * Another new page shows how to implement an on-the-fly Kripke
945
    structure for a custom state space.
946
947
    https://spot.lrde.epita.fr/tut51.html

948
949
  * The concepts.html page now lists all named properties
    used by automata.
950

951
952
953
954
955
956
  Bug fixes:

  * When ltlcross found a bug using a product of complemented
    automata, the error message would report "Comp(Ni)*Comp(Pj)" as
    non-empty while the actual culprit was "Comp(Nj)*Comp(Pi)".

957
958
959
  * Fix some non-deterministic execution of minimize_wdba(), causing
    test-suite failures with the future G++ 7, and clang 3.9.

960
961
962
  * print_lbtt() had a memory leak when printing states without
    successors.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
963
New in spot 2.0.3 (2016-07-11)
964

965
966
967
968
969
  Bug fixes:

  * The degen-lcache=1 option of the degeneralization algorithm (which
    is a default option) did not behave exactly as documented: instead
    of reusing the first level ever created for a state where the
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
970
971
    choice of the level is free, it reused the last level ever used.
    This caused some posterior simulation-based reductions to be less
972
    efficient at reducing automata (on the average).
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
973
  * The generalized testing automata displayed by the online
974
    translator were incorrect (those output by ltl2tgta were OK).
975
  * ltl2tgta should not offer options --ba, --monitor, --tgba and such.
976
  * the relabel() function could incorrectly unregister old atomic
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
977
978
979
    propositions even when they were still used in the output (e.g.,
    if a&p0 is relabeled to p0&p1).  This could cause ltldo and the
    online translator to report errors.
980

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
981
982
983
984
985
986
987
988
New in spot 2.0.2 (2016-06-17)

  Documentation:

  * We now have a citing page at https://spot.lrde.epita.fr/citing.html
    providing a list of references about Spot.
  * The Python examples have been augmented with the two examples
    from our ATVA'16 tool paper.
989

990
991
992
993
  Bug fixes:

  * Fix compilation error observed with Clang++ 3.7.1 and GCC 6.1.1
    headers.
994
  * Fix an infinite recursion in relabel_bse().
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
995
  * Various small typos and cosmetic cleanups.
996

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
997
New in spot 2.0.1 (2016-05-09)
998

999
1000
  Library:

1001
  * twa::unregister_ap() and twa_graph::remove_unused_ap() are new
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1002
    methods introduced to fix some of the bugs listed below.
1003

1004
1005
1006
1007
1008
  Documentation:

  * Add missing documentation for the option string passed to
    spot::make_emptiness_check_instantiator().

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1009
  * There is now a spot(7) man page listing all installed
1010
1011
    command-line tools.

1012
1013
1014
1015
  Python:

  * The tgba_determinize() function is now accessible in Python.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1016
1017
  Bug fixes:

1018
  * The automaton parser would choke on comments like /******/.
1019
  * check_strength() should also set negated properties.
1020
1021
1022
  * Fix autfilt to apply --simplify-exclusive-ap only after
    the simplifications of (--small/--deterministic) have
    been performed.
1023
1024
  * The automaton parser did not fully register atomic propositions
    for automata read from never claim or as LBTT.
1025
  * spot::ltsmin::kripke() had the same issue.
1026
1027
1028
1029
  * The sub_stats_reachable() function used to count the number
    of transitions based on the number of atomic propositions
    actually *used* by the automaton instead of using the number
    of AP declared.
1030
1031
1032
1033
1034
  * print_hoa() will now output all the atomic propositions that have
    been registered, not only those that are used in the automaton.
    (Note that it will also throw an exception if the automaton uses
    an unregistered AP; this is how some of the above bugs were
    found.)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1035
  * For Small or Deterministic preference, the postprocessor
1036
1037
1038
    will now unregister atomic propositions that are no longer
    used in labels.   Simplification of exclusive properties
    and remove_ap::strip() will do similarly.
1039
1040
  * bench/ltl2tgba/ was not working since the source code
    reorganization of 1.99.7.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1041
  * Various typos and minor documentation fixes.
1042

1043

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1044
New in spot 2.0 (2016-04-11)
1045

1046
1047
1048
  Command-line tools:

  * ltlfilt now also support the --accept-word=WORD and
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1049
1050
    --reject-word=WORD options that were introduced in autfilt in the
    previous version.
1051

1052
1053
1054
  Python:

  * The output of spot.atomic_prop_collect() is printable and
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1055
    can now be passed directly to spot.ltsmin.model.kripke().
1056

1057
1058
1059
1060
  Library:

  * digraph::valid_trans() renamed to digraph::is_valid_edge().

1061
1062
  Documentation:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1063
1064
1065
1066
1067
  * The concepts page (https://spot.lrde.epita.fr/concepts.html) now
    includes a highlevel description of the architecture, and some
    notes aboute automata properties.

  * More Doxygen documentation for spot::formula and spot::digraph.
1068

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1069
New in spot 1.99.9 (2016-03-14)
1070

1071
1072
  Command-line tools:

1073
1074
1075
  * autfilt has two new options: --accept-word=WORD and
    --reject-word=WORD for filtering automata that accept or reject
    some word.  The option may be used multiple times.
1076

1077
1078
  Library:

1079
1080
1081
  * The parse_word() function can be used to parse a lasso-shaped
    word and build a twa_word.  The twa_word::as_automaton()
    method can be used to create an automaton out of that.
1082
  * twa::ap_var() renamed to twa::ap_vars().
1083
1084
1085
1086
  * emptiness_check_instantiator::min_acceptance_conditions() and
    emptiness_check_instantiator::max_acceptance_conditions() renamed
    to emptiness_check_instantiator::min_sets() and
    emptiness_check_instantiator::max_sets().
1087
1088
  * tgba_reachable_iterator (and subclasses) was renamed to
    twa_reachable_iterator for consistency.
1089

1090
1091
1092
1093
  Documentation:

  * The page https://spot.lrde.epita.fr/upgrade2.html should help
    people migrating old C++ code written for Spot 1.2.x, and update
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1094
    it for (the upcoming) Spot 2.0.
1095

1096
1097
1098
1099
  Bug fixes:

  * spot/twaalgos/gtec/gtec.hh was incorrectly installed as
  spot/tgbaalgos/gtec/gtec.hh.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1100
  * The shared libraries should now compile again on Darwin.
1101

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1102
New in spot 1.99.8 (2016-02-18)
1103

1104
1105
  Command-line tools:

1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
  * ltl2tgba now also support the --generic option (already supported
    by ltldo and autfilt) to lift any restriction on the acceptance
    condition produced.  This option now has a short version: -G.

  * ltl2tgba and autfilt have learnt how to determinize automata.
    For this to work, --generic acceptance should be enabled (this
    is the default for autfilt, but not for ltl2tgba).

    "ltl2tgba -G -D" will now always outpout a deterministic automaton.
    It can be an automaton with transition-based parity acceptance in
    case Spot could not find a deterministic automaton with (maybe
    generalized) Büchi acceptance.

    "ltl2tgba -D" is unchanged (the --tgba acceptance is the default),
    and will output a deterministic automaton with (generalized) Büchi
    acceptance only if one could be found.  Otherwise a
    non-deterministic automaton is output, but this does NOT mean that
    no deterministic Büchi automaton exist for this formula.  It only
    means Spot could not find it.

    "autfilt -D" will determinize any automaton, because --generic
    acceptance is the default for autfilt.

    "autfilt -D --tgba" will behave like "ltl2tgba -D", i.e., it may
    fail to find a deterministic automaton (even if one exists) and
    return a nondeterministic automaton.

1133
1134
1135
1136
1137
  * "autfilt --complement" now also works for non-deterministic
    automata but will output a deterministic automaton.
    "autfilt --complement --tgba" will likely output a
    nondeterministic TGBA.

1138
1139
1140
  * autfilt has a new option, --included-in, to filter automata whose
    language are included in the language of a given automaton.

1141
1142
1143
  * autfilt has a new option, --equivalent-to, to filter automata
    that are equivalent (language-wise) to a given automaton.

1144
1145
1146
1147
1148
1149
1150
  * ltlcross has a new option --determinize to instruct it to
    complement non-deterministic automata via determinization.  This
    option is not enabled by default as it can potentially be slow and
    generate large automata.  When --determinize is given, option
    --product=0 is implied, since the tests based on products with
    random state-space are pointless for deterministic automata.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1151
1152
1153
  * ltl2tgba and ltldo now support %< and %> in the string passed
    to --stats when reading formulas from a CSV file.

1154
1155
1156
1157
1158
  * ltlfilt's option --size-min=N, --size-max=N, --bsize-min=N, and
    --bsize-max=N have been reimplemented as --size=RANGE and
    --bsize=RANGE.  The old names are still supported for backward
    compatibility, but they are not documented anymore.

1159
1160
  * ltlfilt's option --ap=N can now take a RANGE as parameter.

1161
1162
1163
  * autfilt now has a --ap=RANGE option to filter automata by number
    of atomic propositions.

1164
1165
1166
1167
1168
  Library:

  * Building products with different dictionaries now raise an
    exception instead of using an assertion that could be disabled.

1169
  * The load_ltsmin() function has been split in two.  Now you should
1170
    first call ltsmin_model::load(filename) to create an ltsmin_model,
1171
    and then call the ltsmin_model::kripke(...) method to create an
1172
1173
1174
    automaton that can be iterated on the fly.  The intermediate
    object can be queried about the supported variables and their
    types.
1175

1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
  * print_dot() now accepts several new options:
    - use "<N" to specify a maximum number of states to output.
      Incomplete states are then marked appropriately.  For a quick
      example, compare
	ltl2tgba -D 'Ga | Gb | Gc' -d'<3'
      with
        ltl2tgba -D 'Ga | Gb | Gc' -d
    - use "C(color)" to specify the color to use for filling states.
    - use "#" to display the internal number of each transition
    - use "k" to use state-based labels when possible.  This is
      similar to the "k" option already supported by print_hoa(), and
      is useful when printing Kripke structures.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1188

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1189
1190
  * Option "k" is automatically used by print_dot() and print_hoa()
    when printing Kripke structures.
1191

1192
1193
1194
1195
  * print_dot() also honnor two new automaton properties called
    "highlight-edges" and "highlight-states".  These are used to color
    a subset of edges or transitions.

1196
1197
1198
1199
  * There is a new tgba_determinize() function.  Despite its name, it
    in facts works on transition-based Büchi automaton, and will first
    degeneralize any automaton with generalized Büchi acceptance.

1200
1201
1202
  * The twa_safra_complement class has been removed.  Use
    tgba_determinize() and dtwa_complement() instead.

1203
1204
  * The twa::transition_annotation() and
    twa::compute_support_conditions() methods have been removed.
1205

1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
  * The interface for all functions parsing formulas (LTL, PSL, SERE,
    etc.) has been changed to use an interface similar to the one used
    for parsing automata.  These function now return a parsed_formula
    object that includes both a formula and a list of syntax errors.

    Typically a function written as

       spot::formula read(std::string input)
       {
	  spot::parse_error_list pel;
	  spot::formula f = spot::parse_infix_psl(input, pel);
	  if (spot::format_parse_errors(std::cerr, input, pel))
	    exit(2);
	  return f;
       }

    should be updated to

       spot::formula read(std::string input)
       {
	  spot::parsed_formula pf = spot::parse_infix_psl(input);
	  if (pf.format_errors(std::cerr))
	    exit(2);
	  return pf.f;
       }

1232
1233
  Python:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1234
1235
1236
  * The ltsmin interface has been binded in Python.  It also
    comes with a %%dve cell magic to edit DiVinE models in the notebook.
    See https://spot.lrde.epita.fr/ipynb/ltsmin.html for a short example.
1237

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1238
1239
1240
1241
1242
  * spot.setup() sets de maximum number of states to display in
    automata to 50 by default, as more states is likely to be
    unreadable (and slow to process by GraphViz).  This can be
    overridden by calling spot.setup(max_states=N).

1243
1244
1245
1246
  * Automata now have methods to color selected states and
    transitions.  See
    https://spot.lrde.epita.fr/ipynb/highlighting.html for an example.

1247
1248
1249
1250
1251
  Documentation:

  * There is a new page giving informal illustrations (and extra
    pointers) for some concepts used in Spot.
    See https://spot.lrde.epita.fr/concepts.html
1252

1253
  Bug fixes:
1254
1255
1256