NEWS 154 KB
Newer Older
1
2
New in spot 2.3.2.dev (not yet released)

3
4
5
6
  Bug fixes:

  - In "lenient" mode the parser would fail to recover from
    a missing closing brace.
7

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
8
New in spot 2.3.2 (2017-03-15)
9

10
11
  Tools:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
12
  - In tools that output automata, the number of atomic propositions
13
    can be output using --stats=%x (output automaton) or --stats=%X
14
    (input automaton).  Additional options can be passed to list
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
15
    atomic propositions instead of counting them.  Tools that output
16
    formulas also support --format=%x for this purpose.
17

18
19
  Python:

20
21
  - The bdd_to_formula(), and to_generalized_buchi() functions can now
    be called in Python.
22

23
24
25
26
27
  Documentation:

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

28
29
30
31
32
  Bugs fixed:

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

33
34
35
  - Because of a typo, the output of --stats='...%P...' was correct
    only if %p was used as well.

36
37
38
  - genltl was never meant to have (randomly attributed) short
    options for --postive and --negative.

39
40
41
42
  - 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).

43
44
  - 'ltl2tgba --any -C -M ...' would not complete automata.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
45
  - While not incorrect, the HOA properties output by 'ltl2tgba -M'
46
47
48
49
    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'.

50
51
52
  - spot::twa_graph::set_univ_init_state() could not be called with
    an initializer list.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
53
  - The Python wrappers for spot::twa_graph::state_from_number and
54
55
    spot::twa_graph::state_acc_sets were broken in 2.3.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
56
  - Instantiating an emptiness check on an automaton with unsupported
57
58
59
60
    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
61
  Deprecation notice:
62
63
64
65

  - 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
66
67
    for consistency with tools producing automata, where %a means
    something else.
68
69


Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
70
New in spot 2.3.1 (2017-02-20)
71

72
73
74
75
76
77
  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.

78
79
80
  - The colors used in the output of ltlcross have been adjusted to
    work better with white backgrounds and black backgrounds.

81
82
83
  - The option (y) has been added to --dot. It splits the universal
    edges with the same targets but different colors.

84
85
86
87
88
  - 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.

89
90
91
92
  Library:

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

93
94
95
96
  - 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.

97
98
99
100
101
102
103
  Bugs fixed:

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

  - spot::ltsmin_model::kripke() forgot to register the "dead"
    proposition.
104

105
106
107
108
109
110
  - 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.

111
112
113
  - alternation_removal() was not always reporting the unsupported
    non-weak automata.

114
115
116
117
  - a long-standing typo in the configure code checking for Python
    caused any user-defined CPPFLAGS to be ignored while building
    Spot.

118
119
120
121
  - 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
122
New in spot 2.3 (2017-01-19)
123

124
125
126
127
128
129
130
131
132
133
134
  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.

135
136
137
  * The development Debian packages for Spot now install static
    libraries as well.

138
139
  * We now install configuration files for users of pkg-config.

140
141
  Tools:

142
143
144
  * 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
145
146
    --no-check --product=0 --csv=..." will work with any alternating
    automaton if you just want satistics.
147

148
149
150
151
152
153
  * 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.

154
155
156
  * autfilt has three new filters: --is-very-weak, --is-alternating,
    and --is-semi-deterministic.

157
158
  * the --check option of autfilt/ltl2tgba/ltldo/dstar2tgba can now
    take "semi-determinism" as argument.
159

160
  * autfilt --highlight-languages will color states that recognize
161
    identical languages.  (Only works for deterministic automata.)
162

163
164
165
166
167
  * '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/.
168

169
170
171
172
  * 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
173
    See https://spot.lrde.epita.fr/hierarchy.html
174

175
  * The --format option of ltlfilt/genltl/randltl/ltlgrind learned to
176
    print the class of a formula in the temporal hierarchy of Manna &
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
177
    Pnueli using %h.  See https://spot.lrde.epita.fr/hierarchy.html
178

179
180
181
182
183
184
  * 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.

185
186
187
  * ltldo and ltlcross have learned how to call ltl3hoa, so
    'ltl3hoa -f %f>%O' can be abbreviated to just 'ltl3hoa'.

188
189
190
  Library:

  * A twa is required to have at least one state, the initial state.
191
192
    An automaton can only be empty while it is being constructed,
    but should not be passed to other algorithms.
193

194
  * Couvreur's emptiness check has been rewritten to use the explicit
195
196
    interface when possible, to avoid overkill memory allocations.
    The new version has further optimizations for weak and terminal
197
198
199
    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.
200

201
  * The new version of the Couvreur emptiness check is now the default
202
203
    one, used by twa::is_empty() and twa::accepting_run().  Always
    prefer these functions over an explicit call to Couvreur.
204

205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
  * 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.

223
    - scc_info has been adjusted to handle universal edges as if they
224
225
226
      were existential edges.  As a consequence, acceptance
      information is not accurate.

227
228
229
230
231
232
233
    - 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
234
235
236
    - 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.
237

238
239
240
241
  * 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().
242

243
244
245
246
247
248
  * 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.

249
  * language_map() and highlight_languages() are new functions that
250
    implement autfilt's --highlight-languages option mentionned above.
251

252
  * dtgba_sat_minimize_dichotomy() and dwba_sat_minimize_dichotomy()
253
    use language_map() to estimate a lower bound for binary search.
254

255
  * The encoding part of SAT-based minimization consumes less memory.
256

257
258
259
260
  * 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.
261

262
263
264
265
  * 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).
266

267
268
269
  * The new function mp_class(f) returns the class of the formula
    f in the temporal hierarchy of Manna & Pnueli.

270
271
272
273
274
275
276
277
278
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.

279
Bugs fixed:
280
281
282
283
284
285
286
287

  * 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.

288
289
290
291
  * 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.

292
293
294
295
  * 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.

296
297
298
  * 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
299
New in spot 2.2.2 (2016-12-16)
300

301
302
303
304
305
  Build:

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

306
307
308
309
  Bug fixes:

  * scc_filter() had a left-over print statement that would print
    "names" when copying the name of the states.
310

311
312
313
314
315
  * 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.

316
317
318
319
320
  * 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.

321
322
323
324
  * Some of the installed headers (spot/misc/fixpool.hh,
    spot/misc/mspool.hh, spot/twaalgos/emptiness_stats.hh) were not
    self-contained.

325
326
327
  * ltlfilt --from-ltlf should ensure that "alive" holds initially in
    order to reject empty traces.

328
329
330
  * 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
331
New in spot 2.2.1 (2016-11-21)
332

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
333
  Bug fix:
334

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
335
336
  * The bdd_noderesize() function, as modified in 2.2, would always
    crash.
337

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
338
New in spot 2.2 (2016-11-14)
339

340
341
342
343
344
345
  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
346
347
348
349
  * "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.

350
351
352
  * 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
353
354
355
356
    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
357

358
359
  Library:

360
361
362
  * from_ltlf() is a new function implementing the --from-ltlf
    transformation described above.

363
  * is_unambiguous() was rewritten in a more efficient way.
364

365
  * scc_info learned to determine the acceptance of simple SCCs made
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
366
    of a single self-loop without resorting to remove_fin() for complex
367
368
369
370
371
372
    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.
373

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
374
375
  * Simulation-based reductions now implement just bisimulation-based
    reductions on deterministic automata, to save time.  As an example,
376
377
378
    this halves the run time of
       genltl --rv-counter=10 | ltl2tgba

379
380
  * scc_filter() learned to preserve state names and highlighted states.

381
382
383
384
385
  * 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).

386
387
388
389
390
391
392
393
  * 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
394
395
396
    with any Fin-acceptance removal performed before the product.
    However the plan is to implement these more efficiently in the
    future.
397

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
398
  Bug fixes:
399

400
  * ltl2tgba was always using the highest settings for the LTL
401
402
403
404
    simplifier, ignoring the --low and --medium options.  Now
      genltl --go-theta=12 | ltl2tgba --low --any
    is instantaneous as it should be.

405
406
407
  * 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.)
408

409
410
411
  * 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
412
  * Running the LTL parser in debug mode would crash.
413

414
  * tgba_determinize() could produce incorrect deterministic automata
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
415
    when run with use_simulation=true (the default) on non-simplified
416
417
    automata.

418
419
  * When the automaton_stream_parser reads an automaton from an
    already opened file descriptor, it will not close the file
420
421
422
423
    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.
424

425
426
427
  * remove_fin() could produce incorrect result on incomplete
    automata tagged as weak and deterministic.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
428
429
430
  * 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.
431

432
  * Some buffering issue caused syntax errors to be displayed out
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
433
    of place by the on-line translator.
434

435
New in spot 2.1.2 (2016-10-14)
436

437
438
439
440
441
442
  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.

443
444
445
446
447
448
  * 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.

449
450
451
452
453
454
455
456
  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)).

457
458
  Bug fixes:

459
  * Fix spurious uninitialized read reported by valgrind when
460
    is_Kleene_star() is compiled by clang++.
461

462
  * Using "ltlfilt some-large-file --some-costly-filter" could take
463
464
465
466
467
468
469
    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.

470
471
472
473
  * 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.
474

475
476
  * Fix ltlcross crash when combining --no-check with --verbose.

477
478
479
  * 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
480
New in spot 2.1.1 (2016-09-20)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
481

482
483
484
  Command-line tools:

  * ltlfilt, randltl, genltl, and ltlgrind learned to display the size
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
485
    (%s), Boolean size (%b), and number of atomic propositions (%a)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
486
487
    with the --format and --output options.  A typical use-case is to
    sort formulas by size:
488
489
490
491
       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'

492
493
494
  * autfilt --stats learned the missing %D, %N, %P, and %W sequences,
    to complete the existing %d, %n, %p, and %w.

495
  * The --stats %c option of ltl2tgba, autfilt, ltldo, and dstar2tgba
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
496
    now accepts options to filter the SCCs to count.  For instance
497
498
499
    --stats='%[awT]c' will count the SCCs that are (a)ccepting and
    (w)eak, but (not t)erminal.  See --help for all supported filters.

500
501
502
  Bugs fixed:

  * Fix several cases where command-line tools would fail to diagnose
503
    write errors (e.g. when writing to a filesystem that is full).
504
  * Typos in genltl --help and in the man page spot-x(7).
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
505

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
506
New in spot 2.1 (2016-08-08)
507

508
509
  Command-line tools:

510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
  * 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.

536
537
538
  * ltldo has a new option --errors=... to specify how to deal
    with errors from executed tools.

539
540
  * ltlcross and ltldo learned to bypass the shell when executing
    simple commands (with support for single or double-quoted
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
    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.
559

560
561
  * autfilt learned to filter automata by count of SCCs (--sccs=RANGE)
    or by type of SCCs (--accepting-sccs=RANGE,
562
563
564
    --rejecting-sccs=RANGE, trivial-sccs=RANGE, --terminal-sccs=RANGE,
    --weak-sccs=RANGE, --inherently-weak-sccs=RANGE).

565
  * autfilt learned --remove-unused-ap to remove atomic propositions
566
567
    that are declared in the input automaton, but not actually used.
    This of course makes sense only for input/output formats that
568
    declare atomic propositions (HOA & DSTAR).
569

570
  * autfilt learned two options to filter automata by count of used or
571
572
573
574
    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.

575
576
  * autfilt learned to filter automata by count of nondeterministsic
    states with --nondet-states=RANGE.
577

578
  * autfilt learned to filter automata representing stutter-invariant
579
580
    properties with --is-stutter-invariant.

581
  * autfilt learned two new options to highlight non-determinism:
582
    --highlight-nondet-states=NUM and --highlight-nondet-states=NUM
583
584
    where NUM is a color number.  Additionally --highlight-nondet=NUM is
    a shorthand for using the two.
585

586
  * autfilt learned to highlight a run matching a given word using the
587
588
589
    --highlight-word=[NUM,]WORD option.  However currently this only
    work on automata with Fin-less acceptance.

590
591
592
  * autfilt learned two options --generalized-rabin and
    --generalized-streett to convert the acceptance conditions.

593
  * genltl learned three new families: --dac-patterns=1..45,
594
595
596
    --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 &
597
    Holzmann (Concur'00), Somenzi & Bloem (CAV'00).
598

599
600
  * genltl learned two options, --positive and --negative, to control
    wether formulas should be output after negation or not (or both).
601

602
603
604
605
606
607
608
609
610
611
612
613
614
  * 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.

615
616
  * The --stats option of autfilt, dstar2tgba, ltl2tgba, ltldo,
    randaut learned to display the output (or input if that makes
617
    sense) automaton as a HOA one-liner using %h (or %H), helping to
618
619
    create CSV files contained automata.

620
621
622
623
  * autfilt and dstar2tgba learned to read automata from columns in
    CSV files, specified using the same filename/COLUMN syntax used by
    tools reading formulas.

624
625
626
  * 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
627
    check is done for the arguments of autfilt --sat-minimize=...
628

629
630
631
632
633
634
635
636
637
  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.

638
639
640
641
642
643
644
  * 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

645
646
647
  * highlight_nondet_states() and highlight_nondet_edges() are
    new functions that define the above two named properties.

648
  * is_deterministic(), is_terminal(), is_weak(), and
649
650
651
    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
652
    their check.
653

654
655
656
657
658
659
  * 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.

660
661
662
663
  * to_generalized_rabin() and to_generalized_streett() are two new
    functions that convert the acceptance condition as requested
    without changing the transition structure.

664
665
666
  * language_containment_checker now has default values for all
    parameters of its constructor.

667
668
669
670
  * 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.

671
672
673
674
    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.

675
676
  * 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
677
    what their names suggest.  Note that twa::accepting_run(), unlike
678
679
680
    the two others, is currently restricted to automata with Fin-less
    acceptance.

681
682
683
684
685
  * 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.

686
  * New LTL and PSL simplification rules:
687
688
    - 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
689
690
    - {s[*0..j]}[]->b = {s[*1..j]}[]->b
    - {s[*0..j]}<>->b = {s[*1..j]}<>->b
691

692
693
694
695
  * spot::twa::succ_iterable renamed to
    spot::internal::twa_succ_iterable to make it clear this is not for
    public consumption.

696
697
698
699
700
  * 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.

701
702
  Python:

703
  * The __format__() method for formula supports the same
704
705
706
707
    operator-rewritting feature introduced in ltldo and ltlcross.
    So "{:[i]s}".format(f) is the same as
    "{:s}".format(f.unabbreviate("i")).

708
709
  * Bindings for language_containment_checker were added.

710
711
  * Bindings for randomize() were added.

712
713
714
  * Iterating over edges via "aut.out(s)" or "aut.edges()"
    now allows modifying the edge fields.

715
  * Under IPython the spot.ltsmin module now offers a
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
716
    %%pml magic to define promela models, compile them
717
718
719
    with spins, and dynamically load them.   This is
    akin to the %%dve magic that was already supported.

720
721
722
723
  * The %%dve and %%pml magics honor the SPOT_TMPDIR and
    TMPDIR environment variables.  This especially helps
    when the current directory is read-only.

724
725
726
727
  Documentation:

  * A new example page shows how to test the equivalence of
    two LTL/PSL formulas.  https://spot.lrde.epita.fr/tut04.html
728

729
730
  * A new page discusses explicit vs. on-the-fly interfaces for
    exploring automata in C++.  https://spot.lrde.epita.fr/tut50.html
731

732
  * Another new page shows how to implement an on-the-fly Kripke
733
    structure for a custom state space.
734
735
    https://spot.lrde.epita.fr/tut51.html

736
737
  * The concepts.html page now lists all named properties
    used by automata.
738

739
740
741
742
743
744
  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)".

745
746
747
  * Fix some non-deterministic execution of minimize_wdba(), causing
    test-suite failures with the future G++ 7, and clang 3.9.

748
749
750
  * print_lbtt() had a memory leak when printing states without
    successors.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
751
New in spot 2.0.3 (2016-07-11)
752

753
754
755
756
757
  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
758
759
    choice of the level is free, it reused the last level ever used.
    This caused some posterior simulation-based reductions to be less
760
    efficient at reducing automata (on the average).
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
761
  * The generalized testing automata displayed by the online
762
    translator were incorrect (those output by ltl2tgta were OK).
763
  * ltl2tgta should not offer options --ba, --monitor, --tgba and such.
764
  * the relabel() function could incorrectly unregister old atomic
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
765
766
767
    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.
768

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
769
770
771
772
773
774
775
776
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.
777

778
779
780
781
  Bug fixes:

  * Fix compilation error observed with Clang++ 3.7.1 and GCC 6.1.1
    headers.
782
  * Fix an infinite recursion in relabel_bse().
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
783
  * Various small typos and cosmetic cleanups.
784

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
785
New in spot 2.0.1 (2016-05-09)
786

787
788
  Library:

789
  * twa::unregister_ap() and twa_graph::remove_unused_ap() are new
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
790
    methods introduced to fix some of the bugs listed below.
791

792
793
794
795
796
  Documentation:

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

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
797
  * There is now a spot(7) man page listing all installed
798
799
    command-line tools.

800
801
802
803
  Python:

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

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
804
805
  Bug fixes:

806
  * The automaton parser would choke on comments like /******/.
807
  * check_strength() should also set negated properties.
808
809
810
  * Fix autfilt to apply --simplify-exclusive-ap only after
    the simplifications of (--small/--deterministic) have
    been performed.
811
812
  * The automaton parser did not fully register atomic propositions
    for automata read from never claim or as LBTT.
813
  * spot::ltsmin::kripke() had the same issue.
814
815
816
817
  * 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.
818
819
820
821
822
  * 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
823
  * For Small or Deterministic preference, the postprocessor
824
825
826
    will now unregister atomic propositions that are no longer
    used in labels.   Simplification of exclusive properties
    and remove_ap::strip() will do similarly.
827
828
  * bench/ltl2tgba/ was not working since the source code
    reorganization of 1.99.7.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
829
  * Various typos and minor documentation fixes.
830

831

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
832
New in spot 2.0 (2016-04-11)
833

834
835
836
  Command-line tools:

  * ltlfilt now also support the --accept-word=WORD and
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
837
838
    --reject-word=WORD options that were introduced in autfilt in the
    previous version.
839

840
841
842
  Python:

  * The output of spot.atomic_prop_collect() is printable and
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
843
    can now be passed directly to spot.ltsmin.model.kripke().
844

845
846
847
848
  Library:

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

849
850
  Documentation:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
851
852
853
854
855
  * 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.
856

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
857
New in spot 1.99.9 (2016-03-14)
858

859
860
  Command-line tools:

861
862
863
  * 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.
864

865
866
  Library:

867
868
869
  * 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.
870
  * twa::ap_var() renamed to twa::ap_vars().
871
872
873
874
  * 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().
875
876
  * tgba_reachable_iterator (and subclasses) was renamed to
    twa_reachable_iterator for consistency.
877

878
879
880
881
  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
882
    it for (the upcoming) Spot 2.0.
883

884
885
886
887
  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
888
  * The shared libraries should now compile again on Darwin.
889

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
890
New in spot 1.99.8 (2016-02-18)
891

892
893
  Command-line tools:

894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
  * 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.

921
922
923
924
925
  * "autfilt --complement" now also works for non-deterministic
    automata but will output a deterministic automaton.
    "autfilt --complement --tgba" will likely output a
    nondeterministic TGBA.

926
927
928
  * autfilt has a new option, --included-in, to filter automata whose
    language are included in the language of a given automaton.

929
930
931
  * autfilt has a new option, --equivalent-to, to filter automata
    that are equivalent (language-wise) to a given automaton.

932
933
934
935
936
937
938
  * 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
939
940
941
  * ltl2tgba and ltldo now support %< and %> in the string passed
    to --stats when reading formulas from a CSV file.

942
943
944
945
946
  * 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.

947
948
  * ltlfilt's option --ap=N can now take a RANGE as parameter.

949
950
951
  * autfilt now has a --ap=RANGE option to filter automata by number
    of atomic propositions.

952
953
954
955
956
  Library:

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

957
  * The load_ltsmin() function has been split in two.  Now you should
958
    first call ltsmin_model::load(filename) to create an ltsmin_model,
959
    and then call the ltsmin_model::kripke(...) method to create an
960
961
962
    automaton that can be iterated on the fly.  The intermediate
    object can be queried about the supported variables and their
    types.
963

964
965
966
967
968
969
970
971
972
973
974
975
  * 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
976

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
977
978
  * Option "k" is automatically used by print_dot() and print_hoa()
    when printing Kripke structures.
979

980
981
982
983
  * 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.

984
985
986
987
  * 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.

988
989
990
  * The twa_safra_complement class has been removed.  Use
    tgba_determinize() and dtwa_complement() instead.

991
992
  * The twa::transition_annotation() and
    twa::compute_support_conditions() methods have been removed.
993

994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
  * 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;
       }

1020
1021
  Python:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1022
1023
1024
  * 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.
1025

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1026
1027
1028
1029
1030
  * 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).

1031
1032
1033
1034
  * Automata now have methods to color selected states and
    transitions.  See
    https://spot.lrde.epita.fr/ipynb/highlighting.html for an example.

1035
1036
1037
1038
1039
  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
1040

1041
  Bug fixes:
1042
1043
1044

  * Using ltl2tgba -U would fail to output the unambiguous property
    (regression introduced in 1.99.7)
1045
1046
  * ltlfilt, autfilt, randltl, and randaut could easily crash when
    compiled statically (i.e., with configure --disable-shared).
1047
  * "1 U (a | Fb)" was not always simplified to "F(a | b)".
1048
1049
  * destroying the operands of an otf_product() before the product
    itself could crash.
1050

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1051
New in spot 1.99.7 (2016-01-15)
1052
1053
1054

  Command-line tools:

1055
  * BACKWARD INCOMPATIBLE CHANGE: All tools that output automata now
1056
    use the HOA format by default instead of the GraphViz output.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1057
    This makes it easier to pipe several commands together.
1058
1059
1060
1061
1062
1063

    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
1064
1065
1066
  * 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.
1067
1068
    randaut's short option for specifying edge-density used to be -d:
    it has been renamed to -e.
1069

1070
  * The SPOT_DEFAULT_FORMAT environment variable can be set to 'dot'
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1071
1072
    or 'hoa' to force a default output format for automata.  Additional
    options may also be added, as in SPOT_DEFAULT_FORMAT='hoa=iv'.
1073

1074
1075
  * autfilt has a new option: --is-inherently-weak.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1076
1077
1078
  * The --check=strength option of all tools that produce automata
    will also test if an automaton is inherently weak.

1079
1080
  Library:

1081
1082
1083
1084
1085
1086
1087
1088
1089
  * 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
1090
1091
1092
    -I/usr/include/spot or -I/usr/local/include/spot when compiling,
    as /usr/include and /usr/local/include are usually searched by
    default.
1093
1094
1095
1096

    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
1097
1098
    non-installed version of Spot.  Similarly, iface/ltsmin/ has been
    renamed to spot/ltsmin/, so that installed and non-installed
1099
    directories can be used similarly.
1100

1101
1102
1103
1104
  * twa::~twa() is now calling
      get_dict()->unregister_all_my_variable(this);
    so this does not need to be done in any subclass.

1105
1106
1107
1108
  * is_inherently_weak_automaton() is a new function, and
    check_strength() has been modified to also check inherently weak
    automata.

1109
1110
1111
1112
  * 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.

1113
1114
1115
1116
  * 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.

1117
1118
1119
  * 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.
1120

1121
       acc_cond::marks(...)      -> use acc_cond::mark_t(...)
1122
       acc_cond::sets(m)         -> use m.sets()
1123
       acc_cond::has(m, u)       -> use m.has(u)
1124
1125
1126
1127
       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

1128
    Additionally, the following methods/functions have been renamed:
1129
1130
1131

       acc_cond::is_tt() -> acc_cond::is_t()
       acc_cond::is_ff() -> acc_cond::is_f()
1132
       parse_acc_code()  -> acc_cond::acc_code(...)
1133

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1134
  * Automata property flags (those that tell whether the automaton is
1135
1136
1137
    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
1138
1139
1140
1141
1142
1143
1144
1145
    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.
1146

1147
1148
  Python:

1149
1150
1151
1152
  * 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.

1153
1154
1155
1156
  * 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.

1157
1158
1159
  * Automaton states can be named via the set_state_names() method.
    See https://spot.lrde.epita.fr/ipynb/product.html for an example.

1160
1161
1162
1163
1164
  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

1165
1166
1167
1168
1169
  * 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

1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
  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/

1182
1183
  Bug fixes:

1184
1185
  * twa_graph would incorrectly replace named-states during
    purge_dead_states and purge_unreachable_states.
1186
1187
  * twa::ap() would contain duplicates when an atomic proposition
    was registered several times.
1188
1189
  * 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
1190
1191
  * complete() could incorrectly reuse an existing (but accepting!)
    state as a sink.
1192

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1193
New in spot 1.99.6 (2015-12-04)
1194

1195
1196
  Command-line tools:

1197
1198
1199
1200
  * 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.
1201
1202
    A demonstration of this feature via the Python bindings
    can be found at https://spot.lrde.epita.fr/ipynb/decompose.html
1203

1204
1205
1206
1207
1208
1209
  * All tools that output HOA files accept a --check=strength option
    to request automata to be marked as "weak" or "terminal" as
    appropriate.  Without this option, these properties may only be
    set as a side-effect of running transformations that use this
    information.

1210
1211
1212
1213
1214
1215
1216
  Library:

  * Properties of automata (like the "properties:" line of the HOA
    format) are stored as bits whose interpretation is True=yes,
    False=maybe.  Having getters like "aut->is_deterministic()" or
    "aut->is_unambiguous()" was confusing, because there are separate
    functions "is_deterministic(aut)" and "is_unambiguous(aut)" that
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1217
1218
    do actually check the automaton.  The getters have been renamed to
    avoid confusion, and get names more in line with the HOA format.
1219
1220
1221
1222
1223
1224
1225
1226
1227

    - twa::has_state_based_acc() -> twa::prop_state_acc()
    - twa::prop_state_based_acc(bool) -> twa::prop_state_acc(bool)
    - twa::is_inherently_weak() -> twa::prop_inherently_weak()
    - twa::is_deterministic() -> twa::prop_deterministic()
    - twa::is_unambiguous() -> twa::prop_unambiguous()
    - twa::is_stutter_invariant() -> twa::prop_stutter_invariant()
    - twa::is_stutter_sensitive() -> twa::prop_stutter_sensitive()

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1228
    The setters have the same names as the getters, except they take a
1229
1230
1231
    Boolean argument.  This argument used to be optionnal (defaulting
    to True), but it no longer is.

1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
  * Automata now support the "weak" and "terminal" properties in
    addition to the previously supported "inherently-weak".

  * By default the HOA printer tries not to bloat the output with
    properties that are redundant and probably useless.  The HOA
    printer now has a new option "v" (use "-Hv" from the command line)
    to output more verbose "properties:".  This currently includes
    outputing "no-univ-branch", outputting "unambiguous" even for
    automata already tagged as "deterministic", and "inherently-weak"
    or "weak" even for automata tagged "weak" or "terminal".
1242

1243
1244
1245
1246
  * The HOA printer has a new option "k" (use "-Hk" from the command
    line) to output automata using state labels whenever possible.
    This is useful to print Kripke structures.

1247
1248
1249
1250
1251
  * The dot output will display pair of states when displaying an
    automaton built as an explicit product.  This works in IPython
    with spot.product() or spot.product_or() and in the shell with
    autfilt's --product or --product-or options.

1252
1253
1254
1255
1256
1257
1258