NEWS 155 KB
Newer Older
1
New in spot 2.3.2.dev (not yet released)
2

3
4
  Tools:

5
6
7
  - In autfilt, the options --sum(--sum-or) and --sum-and are
    implemented.

8
  - genltl learned --spec-patterns as an alias for --dac-patterns; it
9
10
11
    also learned two new sets of LTL formulas under --hkrss-patterns
    (a.k.a. --liberouter-patterns) and --p-patterns
    (a.k.a. --beem-patterns).
12

13
14
15
16
17
  Library:

  - spot::sum() and spot::sum_and() implements the union and the
    intersection of two automatons, respectively.

18
19
20
  - twa objects have a new property: prop_complete().  This obviously
    acts as a cache for the is_complete() function.

21
22
23
24
25
  Bug fixes:

  - In "lenient" mode the parser would fail to recover from
    a missing closing brace.

26
27
28
  - The output of 'genltl --r-left=1 --r-right=1 --format=%F'
    had typos.

29
30
31
32
33
34
35
36
37
38
  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.

39

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
40
New in spot 2.3.2 (2017-03-15)
41

42
43
  Tools:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
44
  - In tools that output automata, the number of atomic propositions
45
    can be output using --stats=%x (output automaton) or --stats=%X
46
    (input automaton).  Additional options can be passed to list
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
47
    atomic propositions instead of counting them.  Tools that output
48
    formulas also support --format=%x for this purpose.
49

50
51
  Python:

52
53
  - The bdd_to_formula(), and to_generalized_buchi() functions can now
    be called in Python.
54

55
56
57
58
59
  Documentation:

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

60
61
62
63
64
  Bugs fixed:

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

65
66
67
  - Because of a typo, the output of --stats='...%P...' was correct
    only if %p was used as well.

68
69
70
  - genltl was never meant to have (randomly attributed) short
    options for --postive and --negative.

71
72
73
74
  - 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).

75
76
  - 'ltl2tgba --any -C -M ...' would not complete automata.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
77
  - While not incorrect, the HOA properties output by 'ltl2tgba -M'
78
79
80
81
    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'.

82
83
84
  - spot::twa_graph::set_univ_init_state() could not be called with
    an initializer list.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
85
  - The Python wrappers for spot::twa_graph::state_from_number and
86
87
    spot::twa_graph::state_acc_sets were broken in 2.3.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
88
  - Instantiating an emptiness check on an automaton with unsupported
89
90
91
92
    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
93
  Deprecation notice:
94
95
96
97

  - 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
98
99
    for consistency with tools producing automata, where %a means
    something else.
100

101

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
102
New in spot 2.3.1 (2017-02-20)
103

104
105
106
107
108
109
  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.

110
111
112
  - The colors used in the output of ltlcross have been adjusted to
    work better with white backgrounds and black backgrounds.

113
114
115
  - The option (y) has been added to --dot. It splits the universal
    edges with the same targets but different colors.

116
117
118
119
120
  - 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.

121
122
123
124
125
  - 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

126
127
128
129
  Library:

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

130
131
132
133
  - 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.

134
135
136
137
138
139
140
  Bugs fixed:

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

  - spot::ltsmin_model::kripke() forgot to register the "dead"
    proposition.
141

142
143
144
145
146
147
  - 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.

148
149
150
  - alternation_removal() was not always reporting the unsupported
    non-weak automata.

151
152
153
154
  - a long-standing typo in the configure code checking for Python
    caused any user-defined CPPFLAGS to be ignored while building
    Spot.

155
156
157
158
  - 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
159
New in spot 2.3 (2017-01-19)
160

161
162
163
164
165
166
167
168
169
170
171
  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.

172
173
174
  * The development Debian packages for Spot now install static
    libraries as well.

175
176
  * We now install configuration files for users of pkg-config.

177
178
  Tools:

179
180
181
  * 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
182
183
    --no-check --product=0 --csv=..." will work with any alternating
    automaton if you just want satistics.
184

185
186
187
188
189
190
  * 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.

191
192
193
  * autfilt has three new filters: --is-very-weak, --is-alternating,
    and --is-semi-deterministic.

194
195
  * the --check option of autfilt/ltl2tgba/ltldo/dstar2tgba can now
    take "semi-determinism" as argument.
196

197
  * autfilt --highlight-languages will color states that recognize
198
    identical languages.  (Only works for deterministic automata.)
199

200
201
202
203
204
  * '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/.
205

206
207
208
209
  * 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
210
    See https://spot.lrde.epita.fr/hierarchy.html
211

212
  * The --format option of ltlfilt/genltl/randltl/ltlgrind learned to
213
    print the class of a formula in the temporal hierarchy of Manna &
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
214
    Pnueli using %h.  See https://spot.lrde.epita.fr/hierarchy.html
215

216
217
218
219
220
221
  * 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.

222
223
224
  * ltldo and ltlcross have learned how to call ltl3hoa, so
    'ltl3hoa -f %f>%O' can be abbreviated to just 'ltl3hoa'.

225
226
227
  Library:

  * A twa is required to have at least one state, the initial state.
228
229
    An automaton can only be empty while it is being constructed,
    but should not be passed to other algorithms.
230

231
  * Couvreur's emptiness check has been rewritten to use the explicit
232
233
    interface when possible, to avoid overkill memory allocations.
    The new version has further optimizations for weak and terminal
234
235
236
    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.
237

238
  * The new version of the Couvreur emptiness check is now the default
239
240
    one, used by twa::is_empty() and twa::accepting_run().  Always
    prefer these functions over an explicit call to Couvreur.
241

242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
  * 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.

260
    - scc_info has been adjusted to handle universal edges as if they
261
262
263
      were existential edges.  As a consequence, acceptance
      information is not accurate.

264
265
266
267
268
269
270
    - 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
271
272
273
    - 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.
274

275
276
277
278
  * 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().
279

280
281
282
283
284
285
  * 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.

286
  * language_map() and highlight_languages() are new functions that
287
    implement autfilt's --highlight-languages option mentionned above.
288

289
  * dtgba_sat_minimize_dichotomy() and dwba_sat_minimize_dichotomy()
290
    use language_map() to estimate a lower bound for binary search.
291

292
  * The encoding part of SAT-based minimization consumes less memory.
293

294
295
296
297
  * 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.
298

299
300
301
302
  * 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).
303

304
305
306
  * The new function mp_class(f) returns the class of the formula
    f in the temporal hierarchy of Manna & Pnueli.

307
308
309
310
311
312
313
314
315
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.

316
Bugs fixed:
317
318
319
320
321
322
323
324

  * 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.

325
326
327
328
  * 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.

329
330
331
332
  * 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.

333
334
335
  * 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
336
New in spot 2.2.2 (2016-12-16)
337

338
339
340
341
342
  Build:

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

343
344
345
346
  Bug fixes:

  * scc_filter() had a left-over print statement that would print
    "names" when copying the name of the states.
347

348
349
350
351
352
  * 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.

353
354
355
356
357
  * 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.

358
359
360
361
  * Some of the installed headers (spot/misc/fixpool.hh,
    spot/misc/mspool.hh, spot/twaalgos/emptiness_stats.hh) were not
    self-contained.

362
363
364
  * ltlfilt --from-ltlf should ensure that "alive" holds initially in
    order to reject empty traces.

365
366
367
  * 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
368
New in spot 2.2.1 (2016-11-21)
369

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
370
  Bug fix:
371

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
372
373
  * The bdd_noderesize() function, as modified in 2.2, would always
    crash.
374

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
375
New in spot 2.2 (2016-11-14)
376

377
378
379
380
381
382
  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
383
384
385
386
  * "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.

387
388
389
  * 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
390
391
392
393
    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
394

395
396
  Library:

397
398
399
  * from_ltlf() is a new function implementing the --from-ltlf
    transformation described above.

400
  * is_unambiguous() was rewritten in a more efficient way.
401

402
  * scc_info learned to determine the acceptance of simple SCCs made
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
403
    of a single self-loop without resorting to remove_fin() for complex
404
405
406
407
408
409
    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.
410

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
411
412
  * Simulation-based reductions now implement just bisimulation-based
    reductions on deterministic automata, to save time.  As an example,
413
414
415
    this halves the run time of
       genltl --rv-counter=10 | ltl2tgba

416
417
  * scc_filter() learned to preserve state names and highlighted states.

418
419
420
421
422
  * 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).

423
424
425
426
427
428
429
430
  * 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
431
432
433
    with any Fin-acceptance removal performed before the product.
    However the plan is to implement these more efficiently in the
    future.
434

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
435
  Bug fixes:
436

437
  * ltl2tgba was always using the highest settings for the LTL
438
439
440
441
    simplifier, ignoring the --low and --medium options.  Now
      genltl --go-theta=12 | ltl2tgba --low --any
    is instantaneous as it should be.

442
443
444
  * 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.)
445

446
447
448
  * 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
449
  * Running the LTL parser in debug mode would crash.
450

451
  * tgba_determinize() could produce incorrect deterministic automata
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
452
    when run with use_simulation=true (the default) on non-simplified
453
454
    automata.

455
456
  * When the automaton_stream_parser reads an automaton from an
    already opened file descriptor, it will not close the file
457
458
459
460
    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.
461

462
463
464
  * remove_fin() could produce incorrect result on incomplete
    automata tagged as weak and deterministic.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
465
466
467
  * 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.
468

469
  * Some buffering issue caused syntax errors to be displayed out
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
470
    of place by the on-line translator.
471

472
New in spot 2.1.2 (2016-10-14)
473

474
475
476
477
478
479
  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.

480
481
482
483
484
485
  * 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.

486
487
488
489
490
491
492
493
  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)).

494
495
  Bug fixes:

496
  * Fix spurious uninitialized read reported by valgrind when
497
    is_Kleene_star() is compiled by clang++.
498

499
  * Using "ltlfilt some-large-file --some-costly-filter" could take
500
501
502
503
504
505
506
    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.

507
508
509
510
  * 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.
511

512
513
  * Fix ltlcross crash when combining --no-check with --verbose.

514
515
516
  * 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
517
New in spot 2.1.1 (2016-09-20)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
518

519
520
521
  Command-line tools:

  * ltlfilt, randltl, genltl, and ltlgrind learned to display the size
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
522
    (%s), Boolean size (%b), and number of atomic propositions (%a)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
523
524
    with the --format and --output options.  A typical use-case is to
    sort formulas by size:
525
526
527
528
       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'

529
530
531
  * autfilt --stats learned the missing %D, %N, %P, and %W sequences,
    to complete the existing %d, %n, %p, and %w.

532
  * The --stats %c option of ltl2tgba, autfilt, ltldo, and dstar2tgba
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
533
    now accepts options to filter the SCCs to count.  For instance
534
535
536
    --stats='%[awT]c' will count the SCCs that are (a)ccepting and
    (w)eak, but (not t)erminal.  See --help for all supported filters.

537
538
539
  Bugs fixed:

  * Fix several cases where command-line tools would fail to diagnose
540
    write errors (e.g. when writing to a filesystem that is full).
541
  * Typos in genltl --help and in the man page spot-x(7).
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
542

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
543
New in spot 2.1 (2016-08-08)
544

545
546
  Command-line tools:

547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
  * 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.

573
574
575
  * ltldo has a new option --errors=... to specify how to deal
    with errors from executed tools.

576
577
  * ltlcross and ltldo learned to bypass the shell when executing
    simple commands (with support for single or double-quoted
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
    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.
596

597
598
  * autfilt learned to filter automata by count of SCCs (--sccs=RANGE)
    or by type of SCCs (--accepting-sccs=RANGE,
599
600
601
    --rejecting-sccs=RANGE, trivial-sccs=RANGE, --terminal-sccs=RANGE,
    --weak-sccs=RANGE, --inherently-weak-sccs=RANGE).

602
  * autfilt learned --remove-unused-ap to remove atomic propositions
603
604
    that are declared in the input automaton, but not actually used.
    This of course makes sense only for input/output formats that
605
    declare atomic propositions (HOA & DSTAR).
606

607
  * autfilt learned two options to filter automata by count of used or
608
609
610
611
    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.

612
613
  * autfilt learned to filter automata by count of nondeterministsic
    states with --nondet-states=RANGE.
614

615
  * autfilt learned to filter automata representing stutter-invariant
616
617
    properties with --is-stutter-invariant.

618
  * autfilt learned two new options to highlight non-determinism:
619
    --highlight-nondet-states=NUM and --highlight-nondet-states=NUM
620
621
    where NUM is a color number.  Additionally --highlight-nondet=NUM is
    a shorthand for using the two.
622

623
  * autfilt learned to highlight a run matching a given word using the
624
625
626
    --highlight-word=[NUM,]WORD option.  However currently this only
    work on automata with Fin-less acceptance.

627
628
629
  * autfilt learned two options --generalized-rabin and
    --generalized-streett to convert the acceptance conditions.

630
  * genltl learned three new families: --dac-patterns=1..45,
631
632
633
    --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 &
634
    Holzmann (Concur'00), Somenzi & Bloem (CAV'00).
635

636
637
  * genltl learned two options, --positive and --negative, to control
    wether formulas should be output after negation or not (or both).
638

639
640
641
642
643
644
645
646
647
648
649
650
651
  * 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.

652
653
  * The --stats option of autfilt, dstar2tgba, ltl2tgba, ltldo,
    randaut learned to display the output (or input if that makes
654
    sense) automaton as a HOA one-liner using %h (or %H), helping to
655
656
    create CSV files contained automata.

657
658
659
660
  * autfilt and dstar2tgba learned to read automata from columns in
    CSV files, specified using the same filename/COLUMN syntax used by
    tools reading formulas.

661
662
663
  * 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
664
    check is done for the arguments of autfilt --sat-minimize=...
665

666
667
668
669
670
671
672
673
674
  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.

675
676
677
678
679
680
681
  * 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

682
683
684
  * highlight_nondet_states() and highlight_nondet_edges() are
    new functions that define the above two named properties.

685
  * is_deterministic(), is_terminal(), is_weak(), and
686
687
688
    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
689
    their check.
690

691
692
693
694
695
696
  * 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.

697
698
699
700
  * to_generalized_rabin() and to_generalized_streett() are two new
    functions that convert the acceptance condition as requested
    without changing the transition structure.

701
702
703
  * language_containment_checker now has default values for all
    parameters of its constructor.

704
705
706
707
  * 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.

708
709
710
711
    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.

712
713
  * 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
714
    what their names suggest.  Note that twa::accepting_run(), unlike
715
716
717
    the two others, is currently restricted to automata with Fin-less
    acceptance.

718
719
720
721
722
  * 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.

723
  * New LTL and PSL simplification rules:
724
725
    - 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
726
727
    - {s[*0..j]}[]->b = {s[*1..j]}[]->b
    - {s[*0..j]}<>->b = {s[*1..j]}<>->b
728

729
730
731
732
  * spot::twa::succ_iterable renamed to
    spot::internal::twa_succ_iterable to make it clear this is not for
    public consumption.

733
734
735
736
737
  * 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.

738
739
  Python:

740
  * The __format__() method for formula supports the same
741
742
743
744
    operator-rewritting feature introduced in ltldo and ltlcross.
    So "{:[i]s}".format(f) is the same as
    "{:s}".format(f.unabbreviate("i")).

745
746
  * Bindings for language_containment_checker were added.

747
748
  * Bindings for randomize() were added.

749
750
751
  * Iterating over edges via "aut.out(s)" or "aut.edges()"
    now allows modifying the edge fields.

752
  * Under IPython the spot.ltsmin module now offers a
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
753
    %%pml magic to define promela models, compile them
754
755
756
    with spins, and dynamically load them.   This is
    akin to the %%dve magic that was already supported.

757
758
759
760
  * The %%dve and %%pml magics honor the SPOT_TMPDIR and
    TMPDIR environment variables.  This especially helps
    when the current directory is read-only.

761
762
763
764
  Documentation:

  * A new example page shows how to test the equivalence of
    two LTL/PSL formulas.  https://spot.lrde.epita.fr/tut04.html
765

766
767
  * A new page discusses explicit vs. on-the-fly interfaces for
    exploring automata in C++.  https://spot.lrde.epita.fr/tut50.html
768

769
  * Another new page shows how to implement an on-the-fly Kripke
770
    structure for a custom state space.
771
772
    https://spot.lrde.epita.fr/tut51.html

773
774
  * The concepts.html page now lists all named properties
    used by automata.
775

776
777
778
779
780
781
  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)".

782
783
784
  * Fix some non-deterministic execution of minimize_wdba(), causing
    test-suite failures with the future G++ 7, and clang 3.9.

785
786
787
  * print_lbtt() had a memory leak when printing states without
    successors.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
788
New in spot 2.0.3 (2016-07-11)
789

790
791
792
793
794
  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
795
796
    choice of the level is free, it reused the last level ever used.
    This caused some posterior simulation-based reductions to be less
797
    efficient at reducing automata (on the average).
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
798
  * The generalized testing automata displayed by the online
799
    translator were incorrect (those output by ltl2tgta were OK).
800
  * ltl2tgta should not offer options --ba, --monitor, --tgba and such.
801
  * the relabel() function could incorrectly unregister old atomic
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
802
803
804
    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.
805

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
806
807
808
809
810
811
812
813
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.
814

815
816
817
818
  Bug fixes:

  * Fix compilation error observed with Clang++ 3.7.1 and GCC 6.1.1
    headers.
819
  * Fix an infinite recursion in relabel_bse().
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
820
  * Various small typos and cosmetic cleanups.
821

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
822
New in spot 2.0.1 (2016-05-09)
823

824
825
  Library:

826
  * twa::unregister_ap() and twa_graph::remove_unused_ap() are new
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
827
    methods introduced to fix some of the bugs listed below.
828

829
830
831
832
833
  Documentation:

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

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
834
  * There is now a spot(7) man page listing all installed
835
836
    command-line tools.

837
838
839
840
  Python:

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

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
841
842
  Bug fixes:

843
  * The automaton parser would choke on comments like /******/.
844
  * check_strength() should also set negated properties.
845
846
847
  * Fix autfilt to apply --simplify-exclusive-ap only after
    the simplifications of (--small/--deterministic) have
    been performed.
848
849
  * The automaton parser did not fully register atomic propositions
    for automata read from never claim or as LBTT.
850
  * spot::ltsmin::kripke() had the same issue.
851
852
853
854
  * 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.
855
856
857
858
859
  * 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
860
  * For Small or Deterministic preference, the postprocessor
861
862
863
    will now unregister atomic propositions that are no longer
    used in labels.   Simplification of exclusive properties
    and remove_ap::strip() will do similarly.
864
865
  * bench/ltl2tgba/ was not working since the source code
    reorganization of 1.99.7.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
866
  * Various typos and minor documentation fixes.
867

868

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
869
New in spot 2.0 (2016-04-11)
870

871
872
873
  Command-line tools:

  * ltlfilt now also support the --accept-word=WORD and
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
874
875
    --reject-word=WORD options that were introduced in autfilt in the
    previous version.
876

877
878
879
  Python:

  * The output of spot.atomic_prop_collect() is printable and
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
880
    can now be passed directly to spot.ltsmin.model.kripke().
881

882
883
884
885
  Library:

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

886
887
  Documentation:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
888
889
890
891
892
  * 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.
893

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
894
New in spot 1.99.9 (2016-03-14)
895

896
897
  Command-line tools:

898
899
900
  * 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.
901

902
903
  Library:

904
905
906
  * 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.
907
  * twa::ap_var() renamed to twa::ap_vars().
908
909
910
911
  * 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().
912
913
  * tgba_reachable_iterator (and subclasses) was renamed to
    twa_reachable_iterator for consistency.
914

915
916
917
918
  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
919
    it for (the upcoming) Spot 2.0.
920

921
922
923
924
  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
925
  * The shared libraries should now compile again on Darwin.
926

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
927
New in spot 1.99.8 (2016-02-18)
928

929
930
  Command-line tools:

931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
  * 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.

958
959
960
961
962
  * "autfilt --complement" now also works for non-deterministic
    automata but will output a deterministic automaton.
    "autfilt --complement --tgba" will likely output a
    nondeterministic TGBA.

963
964
965
  * autfilt has a new option, --included-in, to filter automata whose
    language are included in the language of a given automaton.

966
967
968
  * autfilt has a new option, --equivalent-to, to filter automata
    that are equivalent (language-wise) to a given automaton.

969
970
971
972
973
974
975
  * 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
976
977
978
  * ltl2tgba and ltldo now support %< and %> in the string passed
    to --stats when reading formulas from a CSV file.

979
980
981
982
983
  * 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.

984
985
  * ltlfilt's option --ap=N can now take a RANGE as parameter.

986
987
988
  * autfilt now has a --ap=RANGE option to filter automata by number
    of atomic propositions.

989
990
991
992
993
  Library:

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

994
  * The load_ltsmin() function has been split in two.  Now you should
995
    first call ltsmin_model::load(filename) to create an ltsmin_model,
996
    and then call the ltsmin_model::kripke(...) method to create an
997
998
999
    automaton that can be iterated on the fly.  The intermediate
    object can be queried about the supported variables and their
    types.
1000

1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
  * 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
1013

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1014
1015
  * Option "k" is automatically used by print_dot() and print_hoa()
    when printing Kripke structures.
1016

1017
1018
1019
1020
  * 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.

1021
1022
1023
1024
  * 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.

1025
1026
1027
  * The twa_safra_complement class has been removed.  Use
    tgba_determinize() and dtwa_complement() instead.

1028
1029
  * The twa::transition_annotation() and
    twa::compute_support_conditions() methods have been removed.
1030

1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
  * 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;
       }

1057
1058
  Python:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1059
1060
1061
  * 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.
1062

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1063
1064
1065
1066
1067
  * 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).

1068
1069
1070
1071
  * Automata now have methods to color selected states and
    transitions.  See
    https://spot.lrde.epita.fr/ipynb/highlighting.html for an example.

1072
1073
1074
1075
1076
  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
1077

1078
  Bug fixes:
1079
1080
1081

  * Using ltl2tgba -U would fail to output the unambiguous property
    (regression introduced in 1.99.7)
1082
1083
  * ltlfilt, autfilt, randltl, and randaut could easily crash when
    compiled statically (i.e., with configure --disable-shared).
1084
  * "1 U (a | Fb)" was not always simplified to "F(a | b)".
1085
1086
  * destroying the operands of an otf_product() before the product
    itself could crash.
1087

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1088
New in spot 1.99.7 (2016-01-15)
1089
1090
1091

  Command-line tools:

1092
  * BACKWARD INCOMPATIBLE CHANGE: All tools that output automata now
1093
    use the HOA format by default instead of the GraphViz output.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1094
    This makes it easier to pipe several commands together.
1095
1096
1097
1098
1099
1100

    If you have an old script that relies on GraphViz being the default
    output and that you do not want to update it, use
       export SPOT_DEFAULT_FORMAT=dot
    to get the old behavior back.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1101
1102
1103
  * Tools that output automata now accept -d as a shorthand for --dot
    since requesting the GraphViz (a.k.a. dot) output by hand is now
    more frequent.
1104
1105
    randaut's short option for specifying edge-density used to be -d:
    it has been renamed to -e.
1106

1107
  * The SPOT_DEFAULT_FORMAT environment variable can be set to 'dot'
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1108
1109
    or 'hoa' to force a default output format for automata.  Additional
    options may also be added, as in SPOT_DEFAULT_FORMAT='hoa=iv'.
1110

1111
1112
  * autfilt has a new option: --is-inherently-weak.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1113
1114
1115
  * The --check=strength option of all tools that produce automata
    will also test if an automaton is inherently weak.

1116
1117
  Library:

1118
1119
1120
1121
1122
1123
1124
1125
1126
  * Installed headers now assume that they will be included as
    #include <spot/subdir/header.hh>
    instead of
    #include <subdir/header.hh>

    This implies that when Spot headers are installed in
    /usr/include/spot/... (the default when using the Debian packages)
    or /usr/local/include/spot/... (the default when compiling from
    source), then it is no longuer necessary to add
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1127
1128
1129
    -I/usr/include/spot or -I/usr/local/include/spot when compiling,
    as /usr/include and /usr/local/include are usually searched by
    default.
1130
1131
1132
1133

    Inside the source distribution, the subdirectory src/ has been
    renamed to spot/, so that the root of the source tree can also be
    put on the preprocessor's search path to compile against a
1134
1135
    non-installed version of Spot.  Similarly, iface/ltsmin/ has been
    renamed to spot/ltsmin/, so that installed and non-installed
1136
    directories can be used similarly.
1137

1138
1139
1140
1141
  * twa::~twa() is now calling
      get_dict()->unregister_all_my_variable(this);
    so this does not need to be done in any subclass.

1142
1143
1144
1145
  * is_inherently_weak_automaton() is a new function, and
    check_strength() has been modified to also check inherently weak
    automata.

1146
1147
1148
1149
  * decompose_strength() is now extracting inherently weak SCCs
    instead of just weak SCCs.  This gets rid of some corner cases
    that used to require ad hoc handling.

1150
1151
1152
1153
  * acc_cond::acc_code's methods append_or(), append_and(), and
    shift_left() have been replaced by operators |=, &=, <<=, and for
    completeness the operators |, &, and << have been added.

1154
1155
1156
  * Several methods have been removed from the acc_cond
    class because they were simply redundant with the methods of
    acc_cond::mark_t, and more complex to use.
1157

1158
       acc_cond::marks(...)      -> use acc_cond::mark_t(...)
1159
       acc_cond::sets(m)         -> use m.sets()
1160
       acc_cond::has(m, u)       -> use m.has(u)
1161
1162
1163
1164
       acc_cond::cup(l, r)       -> use l | r
       acc_cond::cap(l, r)       -> use l & r
       acc_cond::set_minus(l, r) -> use l - r

1165
    Additionally, the following methods/functions have been renamed:
1166
1167
1168

       acc_cond::is_tt() -> acc_cond::is_t()
       acc_cond::is_ff() -> acc_cond::is_f()
1169
       parse_acc_code()  -> acc_cond::acc_code(...)
1170

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1171
  * Automata property flags (those that tell whether the automaton is
1172
1173
1174
    deterministic, weak, stutter-invariant, etc.) are now stored using
    three-valued logic: in addition to "maybe"/"yes" they can now also
    represent "no".  This is some preparation for the upcomming
1175
1176
1177
1178
1179
1180
1181
1182
    support of the HOA v1.1 format, but it also saves time in some
    algorithms (e.g, is_deterministic() can now return immediately on
    automata marked as not deterministic).

  * The automaton parser now accept negated properties as they will be
    introduced in HOA v1.1, and will check for some inconsistencies.
    These properties are stored and used when appropriate, but they
    are not yet output by the HOA printer.
1183

1184
1185
  Python:

1186
1187
1188
1189
  * Iterating over the transitions leaving a state (the
    twa_graph::out() C++ function) is now possible in Python.  See
    https://spot.lrde.epita.fr/tut21.html for a demonstration.

1190
1191
1192
1193
  * Membership to acceptance sets can be specified using Python list
    when calling for instance the Python version of twa_graph::new_edge().
    See https://spot.lrde.epita.fr/tut22.html for a demonstration.

1194
1195
1196
  * Automaton states can be named via the set_state_names() method.
    See https://spot.lrde.epita.fr/ipynb/product.html for an example.

1197
1198
1199
1200
1201
  Documentation:

  * There is a new page explaining how to compile example programs and
    and link them with Spot.  https://spot.lrde.epita.fr/compile.html

1202
1203
1204
1205
1206
  * Python bindings for manipulating acceptance conditions are
    demonstrated by https://spot.lrde.epita.fr/ipynb/acc_cond.html,
    and a Python implementation of the product of two automata is
    illustrated by https://spot.lrde.epita.fr/ipynb/product.html

1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
  Source code reorganisation:

  * A lot of directories have been shuffled around in the
    distribution:
      src/                   ->  spot/    (see rational above)
      iface/ltsmin/  (code)  ->  spot/ltsmin/
      wrap/python/           ->  python/
      src/tests/             ->  tests/core/
      src/sanity/            ->  tests/sanity/
      iface/ltsmin/  (tests) ->  tests/ltsmin/
      wrap/python/tests      ->  tests/python/

1219
1220
  Bug fixes:

1221
1222
  * twa_graph would incorrectly replace named-states during
    purge_dead_states and purge_unreachable_states.
1223
1224
  * twa::ap() would contain duplicates when an atomic proposition
    was registered several times.
1225
1226
  * product() would incorrectly mark the product of two
    sttuter-sensitive automata as stutter-sensitive as well.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1227
1228
  * complete() could incorrectly reuse an existing (but accepting!)
    state as a sink.
1229

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1230
New in spot 1.99.6 (2015-12-04)
1231

1232
1233
  Command-line tools:

1234
1235
1236
1237
  * autfilt has two new filters: --is-weak and --is-terminal.

  * autfilt has a new transformation: --decompose-strength,
    implementing the decomposition of our TACAS'13 paper.
1238
1239
    A demonstration of this feature via the Python bindings
    can be found at https://spot.lrde.epita.fr/ipynb/decompose.html
1240

1241
1242