NEWS 168 KB
Newer Older
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1
New in spot 2.3.5.dev (not yet released)
2

3
4
5
6
7
8
9
10
11
12
13
  Build:

  - Spot is now built in C++14 mode, so you need at least GCC 5 or
    clang 3.4.  The current version of all major linux distributions
    ship with at least GCC 6, which defaults to C++14, so this should
    not be a problem.  In *this* release of Spot, most of the header
    files are still C++11 compatible, so you should be able to include
    Spot in a C++11 project in case you do not yet want to upgrade.
    There is also an --enable-c++17 option to configure in case you
    want to force a build of Spot in C++17 mode.

14
15
  Tools:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
16
17
18
19
20
21
22
23
  - genaut is a new binary that produces families of automata defined
    in the literature (in the same way as we have genltl for LTL
    formulas).

  - autcross is a new binary that compares the output of tools
    transforming automata (in the same way as we have ltlcross for
    LTL translators).

24
  - autfilt learned to build the union (--sum) or the intersection
Maximilien Colange's avatar
Typos    
Maximilien Colange committed
25
26
    (--sum-and) of two languages by putting two automata side-by-side
    and fiddling with the initial states.  This complements the already
27
28
    implemented intersection (--product) and union (--product-or),
    both based on a product.
29

30
31
  - autfilt learned to complement any alternating automaton with
    option --dualize.
Thomas Medioni's avatar
Thomas Medioni committed
32

33
34
35
36
  - autfilt learned --split-edges to convert labels that are Boolean
    formulas into labels that are min-terms.  (See spot::split_edges()
    below.)

37
38
39
  - autfilt learned --simplify-acceptance to simplify some acceptance
    conditions.  (See spot::simplify_acceptance() below.)

40
41
42
43
  - autfilt --decompote-strength has been renamed to --decompose-scc
    because it can now extract the subautomaton leading to an SCC
    specified by number.  (The old name is still kept as an alias.)

44
45
46
  - The --stats=%c option of tools producing automata can now be
    restricted to count complete SCCs, using %[c]c.

47
48
  Library:

49
50
  - A new library, libspotgen, gathers all functions used to generate
    families of automata or LTL formulas, used by genltl and genaut.
51

52
  - spot::sum() and spot::sum_and() implements the union and the
53
    intersection of two automata by putting them side-by-side and
54
55
    using non-deterministim or universal branching on the initial
    statae.
56

57
58
59
  - twa objects have a new property: prop_complete().  This obviously
    acts as a cache for the is_complete() function.

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
60
  - spot::dualize() complements any alternating automaton.  Since
61
62
63
    the dual of a deterministic automaton is still deterministic, the
    function spot::dtwa_complement() has been deprecated and simply
    calls spot::dualize().
64

65
66
  - spot::dtwa_complement now simply returns the result of dualize()

67
68
69
70
71
72
  - spot::decompose_strength() was extended and renamed to
    spot::decompose_scc() as it can now also extract a subautomaton
    leading to a particular SCC.  A demonstration of this feature via
    the Python bindings can be found at
    https://spot.lrde.epita.fr/ipynb/decompose.html

73
74
  - The print_dot() function will now display names for well known
    acceptance conditions under the formula when option 'a' is used.
75
76
    We plan to enable 'a' by default in a future release, so a new
    option 'A' has been added to hide the acceptance condition.
77

78
79
80
81
82
  - The print_dot() function has a new experimental option 'x' to
    output labels are LaTeX formulas.  This is meant to be used in
    conjunction with the dot2tex tool.  See
      https://spot.lrde.epita.fr/oaut.html#dot2tex

83
84
85
86
  - 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
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
87
88
89
90
91
    remove_ap::strip(), 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
92
93
94
95
96
97
98

      % 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.

99
100
101
102
  - 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".

103
104
105
106
107
  - 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.

108
109
110
111
112
113
  - 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.
114

115
116
117
118
119
  - 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.

120
121
122
123
124
125
126
  - 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.

127
128
129
  - spot::scc_info has two new methods to easily iterate over the
    edges of an SCC: edges_of() and inner_edges_of().

130
131
132
  - spot::scc_info can now be passed a filter function to ignore
    or cut some edges.

133
134
135
136
137
  - 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.

138
139
140
141
142
143
  - 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().

144
145
146
147
148
  - 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.

149
150
151
152
  - The new function spot::simplify_acceptance() is able to perform
    some simplifications on an acceptance condition, and might lead
    to the removal of some acceptance sets.

153
  - The function spot::streett_to_generalized_buchi() is now able to
154
    work on automata with Streett-like acceptance.
155

156
157
158
159
  - spot::relabel_here() was used on automata to rename atomic
    propositions, it can now replace atomic propositions by Boolean
    subformula.  This makes it possible to use relabeling maps
    produced by relabel_bse() on formulas.
160

161
162
163
164
  - twa_graph::copy_state_names_from() can be used to copy the state
    names from another automaton, honoring "original-states" if
    present.

165
166
  - Building automata for LTL formula with a large number N of atomic
    propositions can be costly, because several loops and
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
167
    data-structures are exponential in N.  However a formula like
168
169
170
171
172
173
174
175
      ((a & b & c) | (d & e & f)) U ((d & e & f) | (g & h & i))
    can be translated more efficiently by first building an automaton
    for (p0 | p1) U (p1 | p2), and then substituting p0, p1, p2 by the
    appropriate Boolean formula.  Such a trick is now attempted
    for translation of formulas with 4 atomic propositions or
    more (this threshold can be changed, see -x relabel-bool=N in
    the spot-x(7) man page).

176
177
178
179
  - The new function spot::to_weak_alternating() is able to take an
    input automaton with generalized Büchi/co-Büchi acceptance and
    convert it to a weak alternating automaton.

180
181
  - spot::sbacc() is now able to work on alternating automata.

182
183
184
  - spot::sbacc() and spot::degeneralize() learned to merge
    accepting sinks.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
185
186
187
  - If the SPOT_BDD_TRACE envorinment variable is set, statistics
    about BDD garbage collection and table resizing are shown.

188
189
190
191
192
193
  - The & and | operators for acceptannce conditions have been changed
    slightly to be more symmetrical.  In older version, operator &
    would move Fin() terms to the front, but that is not the case
    anymore.  Also operator & was already grouping all Inf() terms
    (for efficiency reasons), in this version operator | is
    symmetrically grouping all Fin() terms.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
194

195
196
197
198
  - The automaton parser is now reentrant, making it possible to
    process automata from different streams at the same time (i.e.,
    using multiple spot::automaton_stream_parser instances at once).

199
200
201
202
203
204
205
206
207
  - The print_hoa() and parse_automaton() functions have been updated
    to recognize the "exist-branch" property of the non-released HOA
    v1.1, as well as the new meaning of property "deterministic".  (In
    HOA v1 "properties: deterministic" means that the automaton has no
    existential branching; in HOA v1.1 it disallows universal
    branching as well.)  The meaning of "deterministic" in Spot has
    been adjusted to these new semantics, see "Backward-incompatible
    changes" below.

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
208
  - The parser for HOA now recognizes and verifies correct use of the
209
    "univ-branch" property.  This is known to be a problem with option
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
210
    -H1 of ltl3ba 1.1.2 and ltl3dra 0.2.4, so the environment variable
211
212
    SPOT_HOA_TOLERANT can be set to disable the diagnostic.

213
214
215
216
217
  Python:

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

218
219
220
221
  Bugs fixed:

  - When the remove_fin() function was called on some automaton with
    Inf-less acceptance involving at least one disjunction (e.g.,
Maximilien Colange's avatar
Typos    
Maximilien Colange committed
222
    generalized co-Büchi), it would sometimes output an automaton with
223
224
    transition-based acceptance but marked as state-based.

225
226
227
  - The complete() function could complete an empty co-Büchi automaton into an
    automaton accepting everything.

228
229
230
231
232
233
234
235
236
237
  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.

238
239
240
241
242
243
244
  - 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.

245
246
247
  - spot::acc_cond::mark_t::sets() now returns an internal iterable
    object instead of an std::vector<unsigned>.

248
249
250
251
  - The color palette optionally used by print_dot() has been extended
    from 9 to 16 colors.  While the first 8 colors are similar, they
    are a bit more saturated now.

252
253
  Deprecation notice:

254
255
256
  - spot::decompose_strength() is deprecated, it has been renamed
    to spot::decompose_scc().

257
258
259
260
261
262
263
264
  - 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.
265

266
267
268
  - The spot::copy() function is deprecated.  Use
    spot::make_twa_graph() instead.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
269
New in spot 2.3.5 (2017-06-22)
270

271
272
  Bugs fixed:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
273
  - We have fixed new cases where translating multiple formulas in a
274
275
    single ltl2tgba run could produce automata different from those
    produced by individual runs.
276

277
278
279
280
281
  - 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.

282
283
284
285
286
287
  - Using --stats=%s or --stats=%s or --stats=%t could take an
    unnecessary long time on automata with many atomic propositions,
    due to a typo.  Furthermore, %s/%e/%t/%E/%T were printing
    a number of reachable states/edges/transitions, but %S was
    incorrectly counting all states even unreachable.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
288
289
290
  - Our verson of BuDDy had an incorrect optimization for the
    biimp operator.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
291
New in spot 2.3.4 (2017-05-11)
292

293
294
  Bugs fixed:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
295
  - The transformation to state-based acceptance (spot::sbacc()) was
296
    incorrect on automata where the empty acceptance mark is accepting.
297

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
298
  - The --help output of randaut and ltl2tgba was showing an
299
300
    unsupported %b stat.

301
302
303
  - ltldo and ltlcross could leave temporary files behind when
    aborting on error.

304
305
306
307
  - 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.

308
309
310
311
  - 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
312
New in spot 2.3.3 (2017-04-11)
313

314
315
316
317
318
  Tools:

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

319
  - genltl learned --spec-patterns as an alias for --dac-patterns; it
320
321
322
    also learned two new sets of LTL formulas under --hkrss-patterns
    (a.k.a. --liberouter-patterns) and --p-patterns
    (a.k.a. --beem-patterns).
323

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
324
  Bugs fixed:
325

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
326
327
  - In "lenient" mode the formula parser would fail to recover from a
    missing closing brace.
328

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
329
330
  - The output of 'genltl --r-left=1 --r-right=1 --format=%F' had
    typos.
331

332
333
334
335
  - 'ltl2tgba Fa | autfilt --complement' would incorrectly claim that
    the output is "terminal" because dtwa_complement() failed to reset
    that property.

336
337
338
  - spot::twa_graph::purge_unreachable_states() was misbehaving on
    alternating automata.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
339
340
  - In bench/stutter/ the .cc files were not compiling due to warnings
    being caught as errors.
341

342
343
344
345
346
347
  - 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
348
New in spot 2.3.2 (2017-03-15)
349

350
351
  Tools:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
352
  - In tools that output automata, the number of atomic propositions
353
    can be output using --stats=%x (output automaton) or --stats=%X
354
    (input automaton).  Additional options can be passed to list
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
355
    atomic propositions instead of counting them.  Tools that output
356
    formulas also support --format=%x for this purpose.
357

358
359
  Python:

360
361
  - The bdd_to_formula(), and to_generalized_buchi() functions can now
    be called in Python.
362

363
364
365
366
367
  Documentation:

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

368
369
370
371
372
  Bugs fixed:

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

373
374
375
  - Because of a typo, the output of --stats='...%P...' was correct
    only if %p was used as well.

376
377
378
  - genltl was never meant to have (randomly attributed) short
    options for --postive and --negative.

379
380
381
382
  - 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).

383
384
  - 'ltl2tgba --any -C -M ...' would not complete automata.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
385
  - While not incorrect, the HOA properties output by 'ltl2tgba -M'
386
387
388
389
    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'.

390
391
392
  - spot::twa_graph::set_univ_init_state() could not be called with
    an initializer list.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
393
  - The Python wrappers for spot::twa_graph::state_from_number and
394
395
    spot::twa_graph::state_acc_sets were broken in 2.3.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
396
  - Instantiating an emptiness check on an automaton with unsupported
397
398
399
400
    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
401
  Deprecation notice:
402
403
404
405

  - 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
406
407
    for consistency with tools producing automata, where %a means
    something else.
408

409

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
410
New in spot 2.3.1 (2017-02-20)
411

412
413
414
415
416
417
  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.

418
419
420
  - The colors used in the output of ltlcross have been adjusted to
    work better with white backgrounds and black backgrounds.

421
422
423
  - The option (y) has been added to --dot. It splits the universal
    edges with the same targets but different colors.

424
425
426
427
428
  - 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.

429
430
431
432
  Library:

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

433
434
435
436
  - 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.

437
438
439
440
441
442
443
  Bugs fixed:

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

  - spot::ltsmin_model::kripke() forgot to register the "dead"
    proposition.
444

445
446
447
448
449
450
  - 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.

451
452
453
  - alternation_removal() was not always reporting the unsupported
    non-weak automata.

454
455
456
457
  - a long-standing typo in the configure code checking for Python
    caused any user-defined CPPFLAGS to be ignored while building
    Spot.

458
459
460
461
  - 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
462
New in spot 2.3 (2017-01-19)
463

464
465
466
467
468
469
470
471
472
473
474
  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.

475
476
477
  * The development Debian packages for Spot now install static
    libraries as well.

478
479
  * We now install configuration files for users of pkg-config.

480
481
  Tools:

482
483
484
  * 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
485
486
    --no-check --product=0 --csv=..." will work with any alternating
    automaton if you just want satistics.
487

488
489
490
491
492
493
  * 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.

494
495
496
  * autfilt has three new filters: --is-very-weak, --is-alternating,
    and --is-semi-deterministic.

497
498
  * the --check option of autfilt/ltl2tgba/ltldo/dstar2tgba can now
    take "semi-determinism" as argument.
499

500
  * autfilt --highlight-languages will color states that recognize
501
    identical languages.  (Only works for deterministic automata.)
502

503
504
505
506
507
  * '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/.
508

509
510
511
512
  * 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
513
    See https://spot.lrde.epita.fr/hierarchy.html
514

515
  * The --format option of ltlfilt/genltl/randltl/ltlgrind learned to
516
    print the class of a formula in the temporal hierarchy of Manna &
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
517
    Pnueli using %h.  See https://spot.lrde.epita.fr/hierarchy.html
518

519
520
521
522
523
524
  * 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.

525
526
527
  * ltldo and ltlcross have learned how to call ltl3hoa, so
    'ltl3hoa -f %f>%O' can be abbreviated to just 'ltl3hoa'.

528
529
530
  Library:

  * A twa is required to have at least one state, the initial state.
531
532
    An automaton can only be empty while it is being constructed,
    but should not be passed to other algorithms.
533

534
  * Couvreur's emptiness check has been rewritten to use the explicit
535
536
    interface when possible, to avoid overkill memory allocations.
    The new version has further optimizations for weak and terminal
537
538
539
    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.
540

541
  * The new version of the Couvreur emptiness check is now the default
542
543
    one, used by twa::is_empty() and twa::accepting_run().  Always
    prefer these functions over an explicit call to Couvreur.
544

545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
  * 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.

563
    - scc_info has been adjusted to handle universal edges as if they
564
565
566
      were existential edges.  As a consequence, acceptance
      information is not accurate.

567
568
569
570
571
572
573
    - 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
574
575
576
    - 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.
577

578
579
580
581
  * 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().
582

583
584
585
586
587
588
  * 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.

589
  * language_map() and highlight_languages() are new functions that
590
    implement autfilt's --highlight-languages option mentionned above.
591

592
  * dtgba_sat_minimize_dichotomy() and dwba_sat_minimize_dichotomy()
593
    use language_map() to estimate a lower bound for binary search.
594

595
  * The encoding part of SAT-based minimization consumes less memory.
596

597
598
599
600
  * 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.
601

602
603
604
605
  * 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).
606

607
608
609
  * The new function mp_class(f) returns the class of the formula
    f in the temporal hierarchy of Manna & Pnueli.

610
611
612
613
614
615
616
617
618
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.

619
Bugs fixed:
620
621
622
623
624
625
626
627

  * 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.

628
629
630
631
  * 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.

632
633
634
635
  * 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.

636
637
638
  * 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
639
New in spot 2.2.2 (2016-12-16)
640

641
642
643
644
645
  Build:

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

646
647
648
649
  Bug fixes:

  * scc_filter() had a left-over print statement that would print
    "names" when copying the name of the states.
650

651
652
653
654
655
  * 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.

656
657
658
659
660
  * 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.

661
662
663
664
  * Some of the installed headers (spot/misc/fixpool.hh,
    spot/misc/mspool.hh, spot/twaalgos/emptiness_stats.hh) were not
    self-contained.

665
666
667
  * ltlfilt --from-ltlf should ensure that "alive" holds initially in
    order to reject empty traces.

668
669
670
  * 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
671
New in spot 2.2.1 (2016-11-21)
672

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
673
  Bug fix:
674

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
675
676
  * The bdd_noderesize() function, as modified in 2.2, would always
    crash.
677

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
678
New in spot 2.2 (2016-11-14)
679

680
681
682
683
684
685
  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
686
687
688
689
  * "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.

690
691
692
  * 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
693
694
695
696
    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
697

698
699
  Library:

700
701
702
  * from_ltlf() is a new function implementing the --from-ltlf
    transformation described above.

703
  * is_unambiguous() was rewritten in a more efficient way.
704

705
  * scc_info learned to determine the acceptance of simple SCCs made
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
706
    of a single self-loop without resorting to remove_fin() for complex
707
708
709
710
711
712
    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.
713

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
714
715
  * Simulation-based reductions now implement just bisimulation-based
    reductions on deterministic automata, to save time.  As an example,
716
717
718
    this halves the run time of
       genltl --rv-counter=10 | ltl2tgba

719
720
  * scc_filter() learned to preserve state names and highlighted states.

721
722
723
724
725
  * 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).

726
727
728
729
730
731
732
733
  * 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
734
735
736
    with any Fin-acceptance removal performed before the product.
    However the plan is to implement these more efficiently in the
    future.
737

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
738
  Bug fixes:
739

740
  * ltl2tgba was always using the highest settings for the LTL
741
742
743
744
    simplifier, ignoring the --low and --medium options.  Now
      genltl --go-theta=12 | ltl2tgba --low --any
    is instantaneous as it should be.

745
746
747
  * 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.)
748

749
750
751
  * 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
752
  * Running the LTL parser in debug mode would crash.
753

754
  * tgba_determinize() could produce incorrect deterministic automata
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
755
    when run with use_simulation=true (the default) on non-simplified
756
757
    automata.

758
759
  * When the automaton_stream_parser reads an automaton from an
    already opened file descriptor, it will not close the file
760
761
762
763
    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.
764

765
766
767
  * remove_fin() could produce incorrect result on incomplete
    automata tagged as weak and deterministic.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
768
769
770
  * 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.
771

772
  * Some buffering issue caused syntax errors to be displayed out
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
773
    of place by the on-line translator.
774

775
New in spot 2.1.2 (2016-10-14)
776

777
778
779
780
781
782
  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.

783
784
785
786
787
788
  * 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.

789
790
791
792
793
794
795
796
  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)).

797
798
  Bug fixes:

799
  * Fix spurious uninitialized read reported by valgrind when
800
    is_Kleene_star() is compiled by clang++.
801

802
  * Using "ltlfilt some-large-file --some-costly-filter" could take
803
804
805
806
807
808
809
    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.

810
811
812
813
  * 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.
814

815
816
  * Fix ltlcross crash when combining --no-check with --verbose.

817
818
819
  * 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
820
New in spot 2.1.1 (2016-09-20)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
821

822
823
824
  Command-line tools:

  * ltlfilt, randltl, genltl, and ltlgrind learned to display the size
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
825
    (%s), Boolean size (%b), and number of atomic propositions (%a)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
826
827
    with the --format and --output options.  A typical use-case is to
    sort formulas by size:
828
829
830
831
       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'

832
833
834
  * autfilt --stats learned the missing %D, %N, %P, and %W sequences,
    to complete the existing %d, %n, %p, and %w.

835
  * The --stats %c option of ltl2tgba, autfilt, ltldo, and dstar2tgba
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
836
    now accepts options to filter the SCCs to count.  For instance
837
838
839
    --stats='%[awT]c' will count the SCCs that are (a)ccepting and
    (w)eak, but (not t)erminal.  See --help for all supported filters.

840
841
842
  Bugs fixed:

  * Fix several cases where command-line tools would fail to diagnose
843
    write errors (e.g. when writing to a filesystem that is full).
844
  * Typos in genltl --help and in the man page spot-x(7).
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
845

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
846
New in spot 2.1 (2016-08-08)
847

848
849
  Command-line tools:

850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
  * 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.

876
877
878
  * ltldo has a new option --errors=... to specify how to deal
    with errors from executed tools.

879
880
  * ltlcross and ltldo learned to bypass the shell when executing
    simple commands (with support for single or double-quoted
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
    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.
899

900
901
  * autfilt learned to filter automata by count of SCCs (--sccs=RANGE)
    or by type of SCCs (--accepting-sccs=RANGE,
902
903
904
    --rejecting-sccs=RANGE, trivial-sccs=RANGE, --terminal-sccs=RANGE,
    --weak-sccs=RANGE, --inherently-weak-sccs=RANGE).

905
  * autfilt learned --remove-unused-ap to remove atomic propositions
906
907
    that are declared in the input automaton, but not actually used.
    This of course makes sense only for input/output formats that
908
    declare atomic propositions (HOA & DSTAR).
909

910
  * autfilt learned two options to filter automata by count of used or
911
912
913
914
    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.

915
916
  * autfilt learned to filter automata by count of nondeterministsic
    states with --nondet-states=RANGE.
917

918
  * autfilt learned to filter automata representing stutter-invariant
919
920
    properties with --is-stutter-invariant.

921
  * autfilt learned two new options to highlight non-determinism:
922
    --highlight-nondet-states=NUM and --highlight-nondet-states=NUM
923
924
    where NUM is a color number.  Additionally --highlight-nondet=NUM is
    a shorthand for using the two.
925

926
  * autfilt learned to highlight a run matching a given word using the
927
928
929
    --highlight-word=[NUM,]WORD option.  However currently this only
    work on automata with Fin-less acceptance.

930
931
932
  * autfilt learned two options --generalized-rabin and
    --generalized-streett to convert the acceptance conditions.

933
  * genltl learned three new families: --dac-patterns=1..45,
934
935
936
    --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 &
937
    Holzmann (Concur'00), Somenzi & Bloem (CAV'00).
938

939
940
  * genltl learned two options, --positive and --negative, to control
    wether formulas should be output after negation or not (or both).
941

942
943
944
945
946
947
948
949
950
951
952
953
954
  * 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.

955
956
  * The --stats option of autfilt, dstar2tgba, ltl2tgba, ltldo,
    randaut learned to display the output (or input if that makes
957
    sense) automaton as a HOA one-liner using %h (or %H), helping to
958
959
    create CSV files contained automata.

960
961
962
963
  * autfilt and dstar2tgba learned to read automata from columns in
    CSV files, specified using the same filename/COLUMN syntax used by
    tools reading formulas.

964
965
966
  * 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
967
    check is done for the arguments of autfilt --sat-minimize=...
968

969
970
971
972
973
974
975
976
977
  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.

978
979
980
981
982
983
984
  * 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

985
986
987
  * highlight_nondet_states() and highlight_nondet_edges() are
    new functions that define the above two named properties.

988
  * is_deterministic(), is_terminal(), is_weak(), and
989
990
991
    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
992
    their check.
993

994
995
996
997
998
999
  * 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.

1000
1001
1002
1003
  * to_generalized_rabin() and to_generalized_streett() are two new
    functions that convert the acceptance condition as requested
    without changing the transition structure.

1004
1005
1006
  * language_containment_checker now has default values for all
    parameters of its constructor.

1007
1008
1009
1010
  * 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.

1011
1012
1013
1014
    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.

1015
1016
  * 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
1017
    what their names suggest.  Note that twa::accepting_run(), unlike
1018
1019
1020
    the two others, is currently restricted to automata with Fin-less
    acceptance.

1021
1022
1023
1024
1025
  * 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.

1026
  * New LTL and PSL simplification rules:
1027
1028
    - 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
1029
1030
    - {s[*0..j]}[]->b = {s[*1..j]}[]->b
    - {s[*0..j]}<>->b = {s[*1..j]}<>->b
1031

1032
1033
1034
1035
  * spot::twa::succ_iterable renamed to
    spot::internal::twa_succ_iterable to make it clear this is not for
    public consumption.

1036
1037
1038
1039
1040
  * 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.

1041
1042
  Python:

1043
  * The __format__() method for formula supports the same
1044
1045
1046
1047
    operator-rewritting feature introduced in ltldo and ltlcross.
    So "{:[i]s}".format(f) is the same as
    "{:s}".format(f.unabbreviate("i")).

1048
1049
  * Bindings for language_containment_checker were added.

1050
1051
  * Bindings for randomize() were added.

1052
1053
1054
  * Iterating over edges via "aut.out(s)" or "aut.edges()"
    now allows modifying the edge fields.

1055
  * Under IPython the spot.ltsmin module now offers a
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1056
    %%pml magic to define promela models, compile them
1057
1058
1059
    with spins, and dynamically load them.   This is
    akin to the %%dve magic that was already supported.

1060
1061
1062
1063
  * The %%dve and %%pml magics honor the SPOT_TMPDIR and
    TMPDIR environment variables.  This especially helps
    when the current directory is read-only.

1064
1065
1066
1067
  Documentation:

  * A new example page shows how to test the equivalence of
    two LTL/PSL formulas.  https://spot.lrde.epita.fr/tut04.html
1068

1069
1070
  * A new page discusses explicit vs. on-the-fly interfaces for
    exploring automata in C++.  https://spot.lrde.epita.fr/tut50.html
1071

1072
  * Another new page shows how to implement an on-the-fly Kripke
1073
    structure for a custom state space.
1074
1075
    https://spot.lrde.epita.fr/tut51.html

1076
1077
  * The concepts.html page now lists all named properties
    used by automata.
1078

1079
1080
1081
1082
1083
1084
  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)".

1085
1086
1087
  * Fix some non-deterministic execution of minimize_wdba(), causing
    test-suite failures with the future G++ 7, and clang 3.9.

1088
1089
1090
  * print_lbtt() had a memory leak when printing states without
    successors.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1091
New in spot 2.0.3 (2016-07-11)
1092

1093
1094
1095
1096
1097
  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
1098
1099
    choice of the level is free, it reused the last level ever used.
    This caused some posterior simulation-based reductions to be less
1100
    efficient at reducing automata (on the average).
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1101
  * The generalized testing automata displayed by the online
1102
    translator were incorrect (those output by ltl2tgta were OK).
1103
  * ltl2tgta should not offer options --ba, --monitor, --tgba and such.
1104
  * the relabel() function could incorrectly unregister old atomic
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1105
1106
1107
    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.
1108

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1109
1110
1111
1112
1113
1114
1115
1116
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.
1117

1118
1119
1120
1121
  Bug fixes:

  * Fix compilation error observed with Clang++ 3.7.1 and GCC 6.1.1
    headers.
1122
  * Fix an infinite recursion in relabel_bse().
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1123
  * Various small typos and cosmetic cleanups.
1124

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1125
New in spot 2.0.1 (2016-05-09)
1126

1127
1128
  Library:

1129
  * twa::unregister_ap() and twa_graph::remove_unused_ap() are new
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1130
    methods introduced to fix some of the bugs listed below.
1131

1132
1133
1134
1135
1136
  Documentation:

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

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1137
  * There is now a spot(7) man page listing all installed
1138
1139
    command-line tools.

1140
1141
1142
1143
  Python:

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

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1144
1145
  Bug fixes:

1146
  * The automaton parser would choke on comments like /******/.
1147
  * check_strength() should also set negated properties.
1148
1149
1150
  * Fix autfilt to apply --simplify-exclusive-ap only after
    the simplifications of (--small/--deterministic) have
    been performed.
1151
1152
  * The automaton parser did not fully register atomic propositions
    for automata read from never claim or as LBTT.
1153
  * spot::ltsmin::kripke() had the same issue.
1154
1155
1156
1157
  * 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.
1158
1159
1160
1161
1162
  * 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
1163
  * For Small or Deterministic preference, the postprocessor
1164
1165
1166
    will now unregister atomic propositions that are no longer
    used in labels.   Simplification of exclusive properties
    and remove_ap::strip() will do similarly.
1167
1168
  * bench/ltl2tgba/ was not working since the source code
    reorganization of 1.99.7.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1169
  * Various typos and minor documentation fixes.
1170

1171

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1172
New in spot 2.0 (2016-04-11)
1173

1174
1175
1176
  Command-line tools:

  * ltlfilt now also support the --accept-word=WORD and
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1177
1178
    --reject-word=WORD options that were introduced in autfilt in the
    previous version.
1179

1180
1181
1182
  Python:

  * The output of spot.atomic_prop_collect() is printable and
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1183
    can now be passed directly to spot.ltsmin.model.kripke().
1184

1185
1186
1187
1188
  Library:

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

1189
1190
  Documentation:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1191
1192
1193
1194
1195
  * 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.
1196

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1197
New in spot 1.99.9 (2016-03-14)
1198

1199
1200
  Command-line tools:

1201
1202
1203
  * 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.
1204

1205
1206
  Library:

1207
1208
1209
  * 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.
1210
  * twa::ap_var() renamed to twa::ap_vars().
1211
1212
1213
1214
  * 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().
1215
1216
  * tgba_reachable_iterator (and subclasses) was renamed to
    twa_reachable_iterator for consistency.
1217

1218
1219
1220
1221
  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
1222
    it for (the upcoming) Spot 2.0.
1223

1224
1225
1226
1227
  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
1228
  * The shared libraries should now compile again on Darwin.
1229

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1230
New in spot 1.99.8 (2016-02-18)
1231

1232
1233
  Command-line tools:

1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
  * 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.

1261
1262
1263
1264
1265
  * "autfilt --complement" now also works for non-deterministic
    automata but will output a deterministic automaton.
    "autfilt --complement --tgba" will likely output a
    nondeterministic TGBA.

1266
1267
1268
  * autfilt has a new option, --included-in, to filter automata whose
    language are included in the language of a given automaton.

1269
1270
1271
  * autfilt has a new option, --equivalent-to, to filter automata
    that are equivalent (language-wise) to a given automaton.

1272
1273
1274
1275
1276
1277
1278
  * 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
1279