NEWS 172 KB
Newer Older
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1
2
New in spot 2.4.3.dev (not yet released)

3
4
5
6
7
  Bugs fixed:

  - The generic to_generalized_buchi() function would fail if the
    Fin-less & CNF version of the acceptance condition had several
    unit clauses.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
8

9
10
11
12
  - If the automaton passed to sbacc() was incomplete or
    non-deterministic because of some unreachable states, then it was
    possible that the output would marked similarly while it was in
    fact complete or deterministic.
13

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
14
New in spot 2.4.3 (2017-12-19)
15

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
16
  Bugs fixed:
17
18
19

  - couvreur99_new() leaked memory when processing TωA that allocate
    states.
20

21
22
  - Some mismatched placement-new/delete reported by ASAN were fixed.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
23
24
25
26
27
28
29
  - Static compilation was broken on MinGW.

  - Execution of Jupyter notebooks from the testsuite failed with
    recent versions of Python.

  - Fix some warnings triggered by the development version of g++.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
30
31
32
33
34
New in spot 2.4.2 (2017-11-07)

  Tools:

  - ltlcross and ltldo support ltl3tela, the new name of ltl3hoa.
35

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
36
37
38
39
  Bugs fixed:

  - Automata produced by "genaut --ks-nca=N" were incorrectly marked
    as not complete.
40

41
42
43
  - Fix some cases for which the highest setting of formulas
    simplification would produce worse results than lower settings.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
44
New in spot 2.4.1 (2017-10-05)
45

46
47
  Bugs fixed:

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
48
49
  - The formula class failed to build {a->c[*]} although it is
    allowed by our grammar.
50

51
52
53
  - spot::scc_info::determine_unknown_acceptance() incorrectly
    considered some rejecting SCC as accepting.

54
55
56
57
58
59
60
  - spot::streett_to_generalized_buchi() could generate automata with
    empty language if some Fin set did not intersect all accepting
    SCCs.  As a consequence, some Streett-like automata were
    considered empty even though they were not.  Also, the same
    function could crash on input that had a Streett-like acceptance
    not using all declared sets.

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
61
62
63
64
  - The twa_graph::merge_edges() function relied on BDD IDs to sort
    edges.  This in turn caused some algorithms (like the
    degeneralization) to produce slighltly different (but still correct)
    outputs depending on the BDD operations performed before.
65

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
66
67
  - spot::simulation() could incorrectly flag an automaton as
    non-deterministic.
68

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
69
New in spot 2.4 (2017-09-06)
70

71
72
73
74
75
76
77
78
79
80
81
  Build:

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

82
83
  Tools:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
84
85
86
87
88
89
90
91
  - genaut is a new binary that produces families of automata defined
    in the literature (in the same way as we have genltl for LTL
    formulas).

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

92
  - genltl learned two generate two new families of formulas:
93
94
95
96
97
98
      --fxg-or=RANGE         F(p0 | XG(p1 | XG(p2 | ... XG(pn))))
      --gxf-and=RANGE        G(p0 & XF(p1 & XF(p2 & ... XF(pn))))
    The later is a generalization of --eh-pattern=9, for which a
    single state TGBA always exists (but previous version of Spot
    would build larger automata).

99
  - autfilt learned to build the union (--sum) or the intersection
Maximilien Colange's avatar
Typos    
Maximilien Colange committed
100
101
    (--sum-and) of two languages by putting two automata side-by-side
    and fiddling with the initial states.  This complements the already
102
103
    implemented intersection (--product) and union (--product-or),
    both based on a product.
104

105
  - autfilt learned to complement any alternating automaton with
106
    option --dualize.   (See spot::dualize() below.)
Thomas Medioni's avatar
Thomas Medioni committed
107

108
109
110
111
  - autfilt learned --split-edges to convert labels that are Boolean
    formulas into labels that are min-terms.  (See spot::split_edges()
    below.)

112
113
114
  - autfilt learned --simplify-acceptance to simplify some acceptance
    conditions.  (See spot::simplify_acceptance() below.)

115
116
117
118
  - autfilt --decompote-strength has been renamed to --decompose-scc
    because it can now extract the subautomaton leading to an SCC
    specified by number.  (The old name is still kept as an alias.)

119
120
121
  - The --stats=%c option of tools producing automata can now be
    restricted to count complete SCCs, using %[c]c.

122
123
124
125
126
127
  - Tools producing automata have a --stats=... option, and tools
    producing formulas have a --format=... option.  These two options
    work similarly, the use of different names is just historical.
    Starting with this release, all tools that recognize one of these
    two options also accept the other one as an alias.

128
129
  Library:

130
131
  - A new library, libspotgen, gathers all functions used to generate
    families of automata or LTL formulas, used by genltl and genaut.
132

133
  - spot::sum() and spot::sum_and() implements the union and the
134
    intersection of two automata by putting them side-by-side and
135
    using non-deterministim or universal branching on the initial
136
    state.
137

138
139
140
  - twa objects have a new property: prop_complete().  This obviously
    acts as a cache for the is_complete() function.

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
141
  - spot::dualize() complements any alternating automaton.  Since
142
143
144
    the dual of a deterministic automaton is still deterministic, the
    function spot::dtwa_complement() has been deprecated and simply
    calls spot::dualize().
145

146
147
148
149
150
151
  - spot::decompose_strength() was extended and renamed to
    spot::decompose_scc() as it can now also extract a subautomaton
    leading to a particular SCC.  A demonstration of this feature via
    the Python bindings can be found at
    https://spot.lrde.epita.fr/ipynb/decompose.html

152
153
  - The print_dot() function will now display names for well known
    acceptance conditions under the formula when option 'a' is used.
154
155
    We plan to enable 'a' by default in a future release, so a new
    option 'A' has been added to hide the acceptance condition.
156

157
158
159
160
161
  - The print_dot() function has a new experimental option 'x' to
    output labels are LaTeX formulas.  This is meant to be used in
    conjunction with the dot2tex tool.  See
      https://spot.lrde.epita.fr/oaut.html#dot2tex

162
163
164
165
  - A new named property for automata called "original-states" can be
    used to record the origin of a state before transformation.  It is
    currently defined by the degeneralization algorithms, and by
    transform_accessible() and algorithms based on it (like
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
166
167
168
169
170
    remove_ap::strip(), decompose_scc()).  This is realy meant as an
    aid for writing algorithms that need this mapping, but it can also
    be used to debug these algorithms: the "original-states"
    information is displayed by the dot printer when the 'd' option is
    passed.  For instance in
171
172
173
174
175
176
177

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

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

178
179
180
181
  - A new named property for automata called "degen-levels" keeps track
    of the level of a state in a degeneralization. This information
    complements the one carried in "original-states".

182
183
184
185
186
  - A new named property for automata called "simulated-states" can be
    used to record the origin of a state through simulation. The
    behavior is similar to "original-states" above. Determinization
    takes advantage of this in its pretty print.

187
188
189
190
191
192
  - The new function spot::acc_cond::is_streett_like() checks whether
    an acceptance condition is conjunction of disjunctive clauses
    containing at most one Inf and at most one Fin.  It builds a
    vector of pairs to use if we want to assume the automaton has
    Streett acceptance.  The dual function is
    spot::acc_cond::is_rabin_like() works similarly.
193

194
195
196
197
198
  - The degeneralize() function has learned to consider acceptance
    marks common to all edges comming to a state to select its initial
    level.  A similar trick was already used in sbacc(), and saves a
    few states in some cases.

199
200
201
202
203
204
205
  - There is a new spot::split_edges() function that transforms edges
    (labeled by Boolean formulas over atomic propositions) into
    transitions (labeled by conjunctions where each atomic proposition
    appear either positive or negative).  This can be used to
    preprocess automata before feeding them to algorithms or tools
    that expect transitions labeled by letters.

206
207
208
  - spot::scc_info has two new methods to easily iterate over the
    edges of an SCC: edges_of() and inner_edges_of().

209
210
211
  - spot::scc_info can now be passed a filter function to ignore
    or cut some edges.

212
213
214
215
216
  - spot::scc_info now keeps track of acceptance sets that are common
    to all edges in an SCC.  These can be retrieved using
    scc_info::common_sets_of(scc), and they are used by scc_info to
    classify some SCCs as rejecting more easily.

217
218
219
220
221
222
  - The new function acc_code::remove() removes all the given
    acceptance sets from the acceptance condition.

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

223
224
225
226
227
  - spot::cleanup_acceptance_here now takes an additional boolean
    parameter specifying whether to strip useless marks from the
    automaton.  This parameter is defaulted to true, in order to
    keep this modification backward-compatible.

228
229
230
231
  - The new function spot::simplify_acceptance() is able to perform
    some simplifications on an acceptance condition, and might lead
    to the removal of some acceptance sets.

232
  - The function spot::streett_to_generalized_buchi() is now able to
233
    work on automata with Streett-like acceptance.
234

235
236
237
238
239
  - The function for converting deterministic Rabin automata to
    deterministic Büchi automata (when possible), internal to the
    remove_fin() procedure, has been updated to work with
    transition-based acceptance and with Rabin-like acceptance.

240
241
242
243
  - spot::relabel_here() was used on automata to rename atomic
    propositions, it can now replace atomic propositions by Boolean
    subformula.  This makes it possible to use relabeling maps
    produced by relabel_bse() on formulas.
244

245
246
247
248
  - twa_graph::copy_state_names_from() can be used to copy the state
    names from another automaton, honoring "original-states" if
    present.

249
250
  - Building automata for LTL formula with a large number N of atomic
    propositions can be costly, because several loops and
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
251
    data-structures are exponential in N.  However a formula like
252
253
254
255
256
257
258
259
      ((a & b & c) | (d & e & f)) U ((d & e & f) | (g & h & i))
    can be translated more efficiently by first building an automaton
    for (p0 | p1) U (p1 | p2), and then substituting p0, p1, p2 by the
    appropriate Boolean formula.  Such a trick is now attempted
    for translation of formulas with 4 atomic propositions or
    more (this threshold can be changed, see -x relabel-bool=N in
    the spot-x(7) man page).

260
261
262
263
  - The LTL simplification routines learned that an LTL formula like
    G(a & XF(b & XFc & Fd) can be simplified to G(a & Fb & Fc & Fd),
    and dually F(a | XG(b | XGc | Gd)) = F(a | Gb | Gc | Gd).

264
265
266
267
    When working with SERE, the simplification of "expr[*0..1]" was
    improved.  E.g. {{a[*]|b}[*0..1]} becomes {a[*]|b} instead of
    {{a[+]|b}[*0..1]}.

268
269
270
271
  - The new function spot::to_weak_alternating() is able to take an
    input automaton with generalized Büchi/co-Büchi acceptance and
    convert it to a weak alternating automaton.

272
273
  - spot::sbacc() is can now also convert alternating automata
    to state-based acceptance.
274

275
276
277
  - spot::sbacc() and spot::degeneralize() learned to merge
    accepting sinks.

278
  - If the SPOT_BDD_TRACE environment variable is set, statistics
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
279
280
    about BDD garbage collection and table resizing are shown.

281
  - The & and | operators for acceptannce conditions have been changed
282
    slightly to be more symmetrical.  In older versions, operator &
283
284
285
286
    would move Fin() terms to the front, but that is not the case
    anymore.  Also operator & was already grouping all Inf() terms
    (for efficiency reasons), in this version operator | is
    symmetrically grouping all Fin() terms.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
287

288
289
290
291
  - The automaton parser is now reentrant, making it possible to
    process automata from different streams at the same time (i.e.,
    using multiple spot::automaton_stream_parser instances at once).

292
293
294
295
296
297
298
299
300
  - The print_hoa() and parse_automaton() functions have been updated
    to recognize the "exist-branch" property of the non-released HOA
    v1.1, as well as the new meaning of property "deterministic".  (In
    HOA v1 "properties: deterministic" means that the automaton has no
    existential branching; in HOA v1.1 it disallows universal
    branching as well.)  The meaning of "deterministic" in Spot has
    been adjusted to these new semantics, see "Backward-incompatible
    changes" below.

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
301
  - The parser for HOA now recognizes and verifies correct use of the
302
    "univ-branch" property.  This is known to be a problem with option
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
303
    -H1 of ltl3ba 1.1.2 and ltl3dra 0.2.4, so the environment variable
304
305
    SPOT_HOA_TOLERANT can be set to disable the diagnostic.

306
307
308
309
310
  Python:

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

311
312
313
314
  Bugs fixed:

  - When the remove_fin() function was called on some automaton with
    Inf-less acceptance involving at least one disjunction (e.g.,
Maximilien Colange's avatar
Typos    
Maximilien Colange committed
315
    generalized co-Büchi), it would sometimes output an automaton with
316
317
    transition-based acceptance but marked as state-based.

318
319
  - The complete() function could complete an empty co-Büchi automaton
    into an automaton accepting everything.
320

321
322
323
324
325
326
327
328
329
330
  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.

331
332
333
334
335
336
337
  - The previous implementation of spot::is_deterministic() has been
    renamed to spot::is_universal().  The new version of
    spot::is_deterministic() requires the automaton to be both
    universal and existential.  This should not make any difference in
    existing code unless you work with the recently added support for
    alternating automata.

338
339
340
  - spot::acc_cond::mark_t::sets() now returns an internal iterable
    object instead of an std::vector<unsigned>.

341
342
343
344
  - The color palette optionally used by print_dot() has been extended
    from 9 to 16 colors.  While the first 8 colors are similar, they
    are a bit more saturated now.

345
346
347
  Deprecation notices:

  (These functions still work but compilers emit warnings.)
348

349
350
351
  - spot::decompose_strength() is deprecated, it has been renamed
    to spot::decompose_scc().

352
353
354
355
356
357
358
359
  - spot::dtwa_complement() is deprecated.  Prefer the more generic
    spot::dualize() instead.

  - The spot::twa::prop_deterministic() methods have been renamed to
    spot::twa::prop_universal() for consistency with the change to
    is_deterministic() listed above.  We have kept
    spot::twa::prop_deterministic() as a deprecated synonym for
    spot::twa::prop_universal() to help backward compatibility.
360

361
362
363
  - The spot::copy() function is deprecated.  Use
    spot::make_twa_graph() instead.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
364
New in spot 2.3.5 (2017-06-22)
365

366
367
  Bugs fixed:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
368
  - We have fixed new cases where translating multiple formulas in a
369
370
    single ltl2tgba run could produce automata different from those
    produced by individual runs.
371

372
373
374
375
376
  - The print_dot() function had a couple of issues when printing
    alternating automata: in particular, when using flag 's' (display
    SCC) or 'y' (split universal destination by colors) universal
    edges could be connected to undefined states.

377
378
379
380
381
382
  - Using --stats=%s or --stats=%s or --stats=%t could take an
    unnecessary long time on automata with many atomic propositions,
    due to a typo.  Furthermore, %s/%e/%t/%E/%T were printing
    a number of reachable states/edges/transitions, but %S was
    incorrectly counting all states even unreachable.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
383
384
385
  - Our verson of BuDDy had an incorrect optimization for the
    biimp operator.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
386
New in spot 2.3.4 (2017-05-11)
387

388
389
  Bugs fixed:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
390
  - The transformation to state-based acceptance (spot::sbacc()) was
391
    incorrect on automata where the empty acceptance mark is accepting.
392

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
393
  - The --help output of randaut and ltl2tgba was showing an
394
395
    unsupported %b stat.

396
397
398
  - ltldo and ltlcross could leave temporary files behind when
    aborting on error.

399
400
401
402
  - The LTL simplifcation rule that turns F(f)|q into F(f|q)
    when q is a subformula that is both eventual and universal
    was documented but not applied in some forgotten cases.

403
404
405
406
  - Because of some caching inside of ltl2tgba, translating multiple
    formula in single ltl2tgba run could produce automata different
    from those produced by individual runs.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
407
New in spot 2.3.3 (2017-04-11)
408

409
410
411
412
413
  Tools:

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

414
  - genltl learned --spec-patterns as an alias for --dac-patterns; it
415
416
417
    also learned two new sets of LTL formulas under --hkrss-patterns
    (a.k.a. --liberouter-patterns) and --p-patterns
    (a.k.a. --beem-patterns).
418

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
419
  Bugs fixed:
420

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
421
422
  - In "lenient" mode the formula parser would fail to recover from a
    missing closing brace.
423

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
424
425
  - The output of 'genltl --r-left=1 --r-right=1 --format=%F' had
    typos.
426

427
428
429
430
  - 'ltl2tgba Fa | autfilt --complement' would incorrectly claim that
    the output is "terminal" because dtwa_complement() failed to reset
    that property.

431
432
433
  - spot::twa_graph::purge_unreachable_states() was misbehaving on
    alternating automata.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
434
435
  - In bench/stutter/ the .cc files were not compiling due to warnings
    being caught as errors.
436

437
438
439
440
441
442
  - The code in charge of detecting DBA-type Rabin automata is
    actually written to handle a slightly larger class of acceptance
    conditions (e.g., Fin(0)|(Fin(1)&Inf(2))), however it failed to
    correctly detect DBA-typeness in some of these non-Rabin
    acceptance.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
443
New in spot 2.3.2 (2017-03-15)
444

445
446
  Tools:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
447
  - In tools that output automata, the number of atomic propositions
448
    can be output using --stats=%x (output automaton) or --stats=%X
449
    (input automaton).  Additional options can be passed to list
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
450
    atomic propositions instead of counting them.  Tools that output
451
    formulas also support --format=%x for this purpose.
452

453
454
  Python:

455
456
  - The bdd_to_formula(), and to_generalized_buchi() functions can now
    be called in Python.
457

458
459
460
461
462
  Documentation:

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

463
464
465
466
467
  Bugs fixed:

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

468
469
470
  - Because of a typo, the output of --stats='...%P...' was correct
    only if %p was used as well.

471
472
473
  - genltl was never meant to have (randomly attributed) short
    options for --postive and --negative.

474
475
476
477
  - 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).

478
479
  - 'ltl2tgba --any -C -M ...' would not complete automata.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
480
  - While not incorrect, the HOA properties output by 'ltl2tgba -M'
481
482
483
484
    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'.

485
486
487
  - spot::twa_graph::set_univ_init_state() could not be called with
    an initializer list.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
488
  - The Python wrappers for spot::twa_graph::state_from_number and
489
490
    spot::twa_graph::state_acc_sets were broken in 2.3.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
491
  - Instantiating an emptiness check on an automaton with unsupported
492
493
494
495
    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
496
  Deprecation notice:
497
498
499
500

  - 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
501
502
    for consistency with tools producing automata, where %a means
    something else.
503

504

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
505
New in spot 2.3.1 (2017-02-20)
506

507
508
509
510
511
512
  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.

513
514
515
  - The colors used in the output of ltlcross have been adjusted to
    work better with white backgrounds and black backgrounds.

516
517
518
  - The option (y) has been added to --dot. It splits the universal
    edges with the same targets but different colors.

519
520
521
522
523
  - 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.

524
525
526
527
  Library:

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

528
529
530
531
  - 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.

532
533
534
535
536
537
538
  Bugs fixed:

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

  - spot::ltsmin_model::kripke() forgot to register the "dead"
    proposition.
539

540
541
542
543
544
545
  - 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.

546
547
548
  - alternation_removal() was not always reporting the unsupported
    non-weak automata.

549
550
551
552
  - a long-standing typo in the configure code checking for Python
    caused any user-defined CPPFLAGS to be ignored while building
    Spot.

553
554
555
556
  - 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
557
New in spot 2.3 (2017-01-19)
558

559
560
561
562
563
564
565
566
567
568
569
  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.

570
571
572
  * The development Debian packages for Spot now install static
    libraries as well.

573
574
  * We now install configuration files for users of pkg-config.

575
576
  Tools:

577
578
579
  * 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
580
581
    --no-check --product=0 --csv=..." will work with any alternating
    automaton if you just want satistics.
582

583
584
585
586
587
588
  * 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.

589
590
591
  * autfilt has three new filters: --is-very-weak, --is-alternating,
    and --is-semi-deterministic.

592
593
  * the --check option of autfilt/ltl2tgba/ltldo/dstar2tgba can now
    take "semi-determinism" as argument.
594

595
  * autfilt --highlight-languages will color states that recognize
596
    identical languages.  (Only works for deterministic automata.)
597

598
599
600
601
602
  * '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/.
603

604
605
606
607
  * 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
608
    See https://spot.lrde.epita.fr/hierarchy.html
609

610
  * The --format option of ltlfilt/genltl/randltl/ltlgrind learned to
611
    print the class of a formula in the temporal hierarchy of Manna &
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
612
    Pnueli using %h.  See https://spot.lrde.epita.fr/hierarchy.html
613

614
615
616
617
618
619
  * 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.

620
621
622
  * ltldo and ltlcross have learned how to call ltl3hoa, so
    'ltl3hoa -f %f>%O' can be abbreviated to just 'ltl3hoa'.

623
624
625
  Library:

  * A twa is required to have at least one state, the initial state.
626
627
    An automaton can only be empty while it is being constructed,
    but should not be passed to other algorithms.
628

629
  * Couvreur's emptiness check has been rewritten to use the explicit
630
631
    interface when possible, to avoid overkill memory allocations.
    The new version has further optimizations for weak and terminal
632
633
634
    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.
635

636
  * The new version of the Couvreur emptiness check is now the default
637
638
    one, used by twa::is_empty() and twa::accepting_run().  Always
    prefer these functions over an explicit call to Couvreur.
639

640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
  * 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.

658
    - scc_info has been adjusted to handle universal edges as if they
659
660
661
      were existential edges.  As a consequence, acceptance
      information is not accurate.

662
663
664
665
666
667
668
    - 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
669
670
671
    - 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.
672

673
674
675
676
  * 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().
677

678
679
680
681
682
683
  * 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.

684
  * language_map() and highlight_languages() are new functions that
685
    implement autfilt's --highlight-languages option mentionned above.
686

687
  * dtgba_sat_minimize_dichotomy() and dwba_sat_minimize_dichotomy()
688
    use language_map() to estimate a lower bound for binary search.
689

690
  * The encoding part of SAT-based minimization consumes less memory.
691

692
693
694
695
  * 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.
696

697
698
699
700
  * 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).
701

702
703
704
  * The new function mp_class(f) returns the class of the formula
    f in the temporal hierarchy of Manna & Pnueli.

705
706
707
708
709
710
711
712
713
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.

714
Bugs fixed:
715
716
717
718
719
720
721
722

  * 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.

723
724
725
726
  * 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.

727
728
729
730
  * 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.

731
732
733
  * 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
734
New in spot 2.2.2 (2016-12-16)
735

736
737
738
739
740
  Build:

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

741
742
743
744
  Bug fixes:

  * scc_filter() had a left-over print statement that would print
    "names" when copying the name of the states.
745

746
747
748
749
750
  * 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.

751
752
753
754
755
  * 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.

756
757
758
759
  * Some of the installed headers (spot/misc/fixpool.hh,
    spot/misc/mspool.hh, spot/twaalgos/emptiness_stats.hh) were not
    self-contained.

760
761
762
  * ltlfilt --from-ltlf should ensure that "alive" holds initially in
    order to reject empty traces.

763
764
765
  * 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
766
New in spot 2.2.1 (2016-11-21)
767

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
768
  Bug fix:
769

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
770
771
  * The bdd_noderesize() function, as modified in 2.2, would always
    crash.
772

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
773
New in spot 2.2 (2016-11-14)
774

775
776
777
778
779
780
  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
781
782
783
784
  * "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.

785
786
787
  * 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
788
789
790
791
    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
792

793
794
  Library:

795
796
797
  * from_ltlf() is a new function implementing the --from-ltlf
    transformation described above.

798
  * is_unambiguous() was rewritten in a more efficient way.
799

800
  * scc_info learned to determine the acceptance of simple SCCs made
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
801
    of a single self-loop without resorting to remove_fin() for complex
802
803
804
805
806
807
    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.
808

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
809
810
  * Simulation-based reductions now implement just bisimulation-based
    reductions on deterministic automata, to save time.  As an example,
811
812
813
    this halves the run time of
       genltl --rv-counter=10 | ltl2tgba

814
815
  * scc_filter() learned to preserve state names and highlighted states.

816
817
818
819
820
  * 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).

821
822
823
824
825
826
827
828
  * 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
829
830
831
    with any Fin-acceptance removal performed before the product.
    However the plan is to implement these more efficiently in the
    future.
832

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
833
  Bug fixes:
834

835
  * ltl2tgba was always using the highest settings for the LTL
836
837
838
839
    simplifier, ignoring the --low and --medium options.  Now
      genltl --go-theta=12 | ltl2tgba --low --any
    is instantaneous as it should be.

840
841
842
  * 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.)
843

844
845
846
  * 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
847
  * Running the LTL parser in debug mode would crash.
848

849
  * tgba_determinize() could produce incorrect deterministic automata
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
850
    when run with use_simulation=true (the default) on non-simplified
851
852
    automata.

853
854
  * When the automaton_stream_parser reads an automaton from an
    already opened file descriptor, it will not close the file
855
856
857
858
    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.
859

860
861
862
  * remove_fin() could produce incorrect result on incomplete
    automata tagged as weak and deterministic.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
863
864
865
  * 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.
866

867
  * Some buffering issue caused syntax errors to be displayed out
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
868
    of place by the on-line translator.
869

870
New in spot 2.1.2 (2016-10-14)
871

872
873
874
875
876
877
  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.

878
879
880
881
882
883
  * 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.

884
885
886
887
888
889
890
891
  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)).

892
893
  Bug fixes:

894
  * Fix spurious uninitialized read reported by valgrind when
895
    is_Kleene_star() is compiled by clang++.
896

897
  * Using "ltlfilt some-large-file --some-costly-filter" could take
898
899
900
901
902
903
904
    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.

905
906
907
908
  * 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.
909

910
911
  * Fix ltlcross crash when combining --no-check with --verbose.

912
913
914
  * 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
915
New in spot 2.1.1 (2016-09-20)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
916

917
918
919
  Command-line tools:

  * ltlfilt, randltl, genltl, and ltlgrind learned to display the size
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
920
    (%s), Boolean size (%b), and number of atomic propositions (%a)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
921
922
    with the --format and --output options.  A typical use-case is to
    sort formulas by size:
923
924
925
926
       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'

927
928
929
  * autfilt --stats learned the missing %D, %N, %P, and %W sequences,
    to complete the existing %d, %n, %p, and %w.

930
  * The --stats %c option of ltl2tgba, autfilt, ltldo, and dstar2tgba
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
931
    now accepts options to filter the SCCs to count.  For instance
932
933
934
    --stats='%[awT]c' will count the SCCs that are (a)ccepting and
    (w)eak, but (not t)erminal.  See --help for all supported filters.

935
936
937
  Bugs fixed:

  * Fix several cases where command-line tools would fail to diagnose
938
    write errors (e.g. when writing to a filesystem that is full).
939
  * Typos in genltl --help and in the man page spot-x(7).
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
940

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
941
New in spot 2.1 (2016-08-08)
942

943
944
  Command-line tools:

945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
  * 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.

971
972
973
  * ltldo has a new option --errors=... to specify how to deal
    with errors from executed tools.

974
975
  * ltlcross and ltldo learned to bypass the shell when executing
    simple commands (with support for single or double-quoted
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
    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.
994

995
996
  * autfilt learned to filter automata by count of SCCs (--sccs=RANGE)
    or by type of SCCs (--accepting-sccs=RANGE,
997
998
999
    --rejecting-sccs=RANGE, trivial-sccs=RANGE, --terminal-sccs=RANGE,
    --weak-sccs=RANGE, --inherently-weak-sccs=RANGE).

1000
  * autfilt learned --remove-unused-ap to remove atomic propositions
1001
1002
    that are declared in the input automaton, but not actually used.
    This of course makes sense only for input/output formats that
1003
    declare atomic propositions (HOA & DSTAR).
1004

1005
  * autfilt learned two options to filter automata by count of used or
1006
1007
1008
1009
    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.

1010
1011
  * autfilt learned to filter automata by count of nondeterministsic
    states with --nondet-states=RANGE.
1012

1013
  * autfilt learned to filter automata representing stutter-invariant
1014
1015
    properties with --is-stutter-invariant.

1016
  * autfilt learned two new options to highlight non-determinism:
1017
    --highlight-nondet-states=NUM and --highlight-nondet-states=NUM
1018
1019
    where NUM is a color number.  Additionally --highlight-nondet=NUM is
    a shorthand for using the two.
1020

1021
  * autfilt learned to highlight a run matching a given word using the
1022
1023
1024
    --highlight-word=[NUM,]WORD option.  However currently this only
    work on automata with Fin-less acceptance.

1025
1026
1027
  * autfilt learned two options --generalized-rabin and
    --generalized-streett to convert the acceptance conditions.

1028
  * genltl learned three new families: --dac-patterns=1..45,
1029
1030
1031
    --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 &
1032
    Holzmann (Concur'00), Somenzi & Bloem (CAV'00).
1033

1034
1035
  * genltl learned two options, --positive and --negative, to control
    wether formulas should be output after negation or not (or both).
1036

1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
  * 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.

1050
1051
  * The --stats option of autfilt, dstar2tgba, ltl2tgba, ltldo,
    randaut learned to display the output (or input if that makes
1052
    sense) automaton as a HOA one-liner using %h (or %H), helping to
1053
1054
    create CSV files contained automata.

1055
1056
1057
1058
  * autfilt and dstar2tgba learned to read automata from columns in
    CSV files, specified using the same filename/COLUMN syntax used by
    tools reading formulas.

1059
1060
1061
  * 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
1062
    check is done for the arguments of autfilt --sat-minimize=...
1063

1064
1065
1066
1067
1068
1069
1070
1071
1072
  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.

1073
1074
1075
1076
1077
1078
1079
  * 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

1080
1081
1082
  * highlight_nondet_states() and highlight_nondet_edges() are
    new functions that define the above two named properties.

1083
  * is_deterministic(), is_terminal(), is_weak(), and
1084
1085
1086
    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
1087
    their check.
1088

1089
1090
1091
1092
1093
1094
  * 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.

1095
1096
1097
1098
  * to_generalized_rabin() and to_generalized_streett() are two new
    functions that convert the acceptance condition as requested
    without changing the transition structure.

1099
1100
1101
  * language_containment_checker now has default values for all
    parameters of its constructor.

1102
1103
1104
1105
  * 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.

1106
1107
1108
1109
    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.

1110
1111
  * 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
1112
    what their names suggest.  Note that twa::accepting_run(), unlike
1113
1114
1115
    the two others, is currently restricted to automata with Fin-less
    acceptance.

1116
1117
1118
1119
1120
  * 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.

1121
  * New LTL and PSL simplification rules:
1122
1123
    - 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
1124
1125
    - {s[*0..j]}[]->b = {s[*1..j]}[]->b
    - {s[*0..j]}<>->b = {s[*1..j]}<>->b
1126

1127
1128
1129
1130
  * spot::twa::succ_iterable renamed to
    spot::internal::twa_succ_iterable to make it clear this is not for
    public consumption.

1131
1132
1133
1134
1135
  * 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.

1136
1137
  Python:

1138
  * The __format__() method for formula supports the same
1139
1140
1141
1142
    operator-rewritting feature introduced in ltldo and ltlcross.
    So "{:[i]s}".format(f) is the same as
    "{:s}".format(f.unabbreviate("i")).

1143
1144
  * Bindings for language_containment_checker were added.

1145
1146
  * Bindings for randomize() were added.

1147
1148
1149
  * Iterating over edges via "aut.out(s)" or "aut.edges()"
    now allows modifying the edge fields.

1150
  * Under IPython the spot.ltsmin module now offers a
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1151
    %%pml magic to define promela models, compile them
1152
1153
1154
    with spins, and dynamically load them.   This is
    akin to the %%dve magic that was already supported.

1155
1156
1157
1158
  * The %%dve and %%pml magics honor the SPOT_TMPDIR and
    TMPDIR environment variables.  This especially helps
    when the current directory is read-only.

1159
1160
1161
1162
  Documentation:

  * A new example page shows how to test the equivalence of
    two LTL/PSL formulas.  https://spot.lrde.epita.fr/tut04.html
1163

1164
1165
  * A new page discusses explicit vs. on-the-fly interfaces for
    exploring automata in C++.  https://spot.lrde.epita.fr/tut50.html
1166

1167
  * Another new page shows how to implement an on-the-fly Kripke
1168
    structure for a custom state space.
1169
1170
    https://spot.lrde.epita.fr/tut51.html

1171
1172
  * The concepts.html page now lists all named properties
    used by automata.
1173

1174
1175
1176
1177
1178
1179
  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)".

1180
1181
1182
  * Fix some non-deterministic execution of minimize_wdba(), causing
    test-suite failures with the future G++ 7, and clang 3.9.

1183
1184
1185
  * print_lbtt() had a memory leak when printing states without
    successors.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1186
New in spot 2.0.3 (2016-07-11)
1187

1188
1189
1190
1191
1192
  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
1193
1194
    choice of the level is free, it reused the last level ever used.
    This caused some posterior simulation-based reductions to be less
1195
    efficient at reducing automata (on the average).
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1196
  * The generalized testing automata displayed by the online
1197
    translator were incorrect (those output by ltl2tgta were OK).
1198
  * ltl2tgta should not offer options --ba, --monitor, --tgba and such.
1199
  * the relabel() function could incorrectly unregister old atomic
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1200
1201
1202
    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.
1203

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1204
1205
1206
1207
1208
1209
1210
1211
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.
1212

1213
1214
1215
1216
  Bug fixes:

  * Fix compilation error observed with Clang++ 3.7.1 and GCC 6.1.1
    headers.
1217
  * Fix an infinite recursion in relabel_bse().
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1218
  * Various small typos and cosmetic cleanups.
1219

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1220
New in spot 2.0.1 (2016-05-09)
1221

1222
1223
  Library:

1224
  * twa::unregister_ap() and twa_graph::remove_unused_ap() are new
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1225
    methods introduced to fix some of the bugs listed below.
1226

1227
1228
1229
1230
1231
  Documentation:

  * Add missing documentatio