NEWS 179 KB
Newer Older
1
New in spot 2.4.1.dev (not yet released)
2

3
4
  Tools:

5
6
7
8
  - genltl learned to generate a new family of formulas, taken from
    the SYNTCOMP competition on reactive synthesis:
    --gf-equiv=RANGE      (GFa{1} & GFa{2} & ... & GFa{n}) <-> GFz

9
10
11
12
13
14
  - genltl learned to generate 4 new families of formulas, taken
    from Müller & Sickert's GandALF'17 paper:
    --ms-example=RANGE     GF(a1&X(a2&X(a3&...)))&F(b1&F(b2&F(b3&...)))
    --ms-phi-h=RANGE       FG(a|b)|FG(!a|Xb)|FG(a|XXb)|FG(!a|XXXb)|...
    --ms-phi-r=RANGE       (FGa{n}&GFb{n})|((FGa{n-1}|GFb{n-1})&(...))
    --ms-phi-s=RANGE       (FGa{n}|GFb{n})&((FGa{n-1}&GFb{n-1})|(...))
15

16
17
18
19
  - autfilt learned --streett-like to convert an automaton in order to
    have a Streett-like acceptance condition. It only works with
    ω-automata having an acceptance in disjunctive normal form.

20
21
22
23
24
  - autfilt learned --dca to convert a Streett-like automaton or an
    automaton with an acceptance in disjunctive normal form to a
    deterministic co-Büchi automaton using the new functions
    [nsa-dnf]_to_dca() described below.

25
26
27
28
29
30
31
32
33
  - ltlfilt learned to measure wall-time using --format=%r.

  - ltlfilt learned to measure cpu-time (as opposed to wall-time) using
    --format=%R. User or system time, for children or parent, can be
    measured separately by 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

Thibaud Michaud's avatar
Thibaud Michaud committed
34
35
36
  - ltlsynt is a new tool for synthesizing AIGER circuits from LTL/PSL
    formulas.

37
38
  - ltldo learned to limit the number of automata it outputs using -n.

39
40
  - autcross, ltlcross, and ltldo learned --fail-on-timeout.

41
42
43
44
45
46
47
  - ltlcross learned --reference=COMMANDFMT to specify a translator
    that should be trusted.  Doing so makes it possible to reduce the
    number of tests to be performed, as all other translators will be
    compared to the reference's output when available.  Multiple
    reference can be given; in that case other tools are compared
    against the smallest reference automaton.

48
49
50
51
  - The new -x tls-impl=N option allows to fine-tune the
    implication-based simplification rules of ltl2tgba.  See the
    spot-x man-page for details.

52
53
54
55
56
  Library:

  - Rename three methods of spot::scc_info. New names are clearer. The
    old names have been deprecated.

57
58
59
60
61
62
63
  - scc_info now takes an optional argument to disable some feature
    that are expansive and not always necessary.  By default scc_info
    tracks the list of all states that belong to an SCC (you may now
    ask it not to), tracks the successor SCCs of each SCC (that can
    but turned off), and explores all SCCs of the automaton (you may
    request to stop on the first SCC that is found accepting).

64
65
66
67
68
  - The new function scc_info::states_on_acc_cycle_of() is able to
    return all states visited by any accepting cycles of the
    specified SCC. It must only be called on automata with a
    Streett-like acceptance condition.

69
70
71
72
73
  - The new function dnf_to_streett() is able to convert any automaton
    with an acceptance condition in Disjunctive Normal Form to a
    Streett-like automaton. This is used by the new option
    '--streett-like' of autfilt.

74
75
76
77
78
79
80
81
  - The new functions spot::nsa_to_[nca-dca]()
    (or spot::dnf_to_[nca-dca]()) are able to convert when possible a
    Streett-like automaton (or any automaton with an acceptance in DNF)
    to an equivalent 'nca' (nondeterministic co-Büchi automaton) or
    'dca' (deterministic co-Büchi automaton).  Actually the resulting
    automaton will always recognize at least the same language.  It can
    recognize more if the original language can not be expressed with
    a co-Büchi acceptance condition.
82

83
84
85
86
87
88
89
90
91
92
93
  - The new functions spot::is_recurrence() and spot::is_persistence()
    check respectively if a formula f belongs to the recurrence or
    persistence class. Two algorithms are available, one that
    checks if a formula is cobuchi_realizable (then it belongs to the
    persistence class) and the other that checks if it is
    detbuchi_realizable (then it belongs to the recurrence class).
    Force one method or the other by setting the environment variable
    SPOT_PR_CHECK to 1 or 2.
    Note that thanks to the duality of both classes, both algorithms
    will work either on f or its negation.
    (see https://spot.lrde.epita.fr/hierarchy.html for details).
94

95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
  - The new function spot::is_colored() checks if an automaton is colored
    (i.e., every transition belongs to exactly one acceptance set)

  - The new function spot::change_parity() can convert an automaton with parity
    acceptance condition to an equivalent automaton with another type of parity
    acceptance condition. The type of a parity acceptance condition states
    whether it is an odd or even parity acceptance condition, and whether it is
    a min or max parity acceptance condition.

  - The new function spot::colorize_parity() can colorize an automaton with
    a parity acceptance condition. The resulting automaton is a parity automaton
    and every transition belongs to exactly one acceptance set.

  - The new function spot::cleanup_parity_acceptance() can simplify the
    acceptance condition of an automaton with parity acceptance condition. It
    removes the unused acceptance sets and merges acceptance sets to keep the
    parity acceptance condition.

  - The new functions spot::parity_product() and spot::parity_product_or()
    compute respectively the intersection and the union of two automata with
    parity acceptance condition and keep the parity acceptance condition.

117
118
119
120
  - The new function spot::remove_univ_otf() removes universal
    transitions on the fly from an alternating Büchi automaton
    using Miyano and Hayashi's breakpoint algorithm.

121
122
123
124
125
126
127
128
  - In some cases, spot::degeneralize() would output Büchi automata
    with more SCCs than its input.  This was hard to notice, because
    very often simulation-based simplifications remove those extra
    SCCs.  This situation is now detected by spot::degeneralized() and
    fixed before returning the automaton.  A new optionnal argument
    can be passed to disable this behavior (or use -x degen-remscc=0
    from the command-line).

129
130
131
132
  - The functions for detecting stutter-invariant formulas or automata
    have been overhauled.  Their interface changed slightly.  They are
    now fully documented.

133
134
135
  - In addition to detecting stutter-invariant formulas/automata, some
    can now study a stutter-sensitive automaton and detect the subset
    of states that are stutter-invariant.  See
136
    https://spot.lrde.epita.fr/ipynb/stutter-inv.html for examples.
137

138
139
140
141
142
  - Determinization has been heavily rewritten and optimized. The algorithm has
    (almost) not changed, but it runs muuuch faster now. It also features an
    optimization for stutter-invariant automata that may produce slightly
    smaller automata.

143
144
145
146
  - acc_cond::name(fmt) is a new method that name well-known acceptance
    conditions.   The fmt parameter specify the format to use for that
    name (e.g. to the style used in HOA, or that used by print_dot()).

147
148
149
150
151
152
153
154
155
  Deprecation notices:

  (These functions still work but compilers emit warnings.)

  - spot::scc_info::used_acc(), spot::scc_info::used_acc_of() and
    spot::scc_info::acc() are deprecated. They have been renamed
    spot::scc_info::marks(), spot::scc_info::marks_of() and
    spot::scc_info::acc_sets_of() respectively.

156
157
158
159
160
161
162
163
  Backward incompatible changes:

  - The spot::closure(), spot::sl2(), spot::is_stutter_invariant()
    functions no longuer takes && arguments.  The former two have
    spot::closure_inplace() and spot::sl2_inplace() variant.  These
    function also do not take to list of atomic propositions as an
    argument anymore.

164
165
166
167
  - The spot::bmrand() and spot::prand() functions have been removed.
    They were not used at all in Spot, and it's not Spot's objective
    to provide such random functions.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
168
169
170
171
172
  Bugs fixed:

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

173
174
175
  - 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
176
New in spot 2.4.1 (2017-10-05)
177

178
179
  Bugs fixed:

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
180
181
  - The formula class failed to build {a->c[*]} although it is
    allowed by our grammar.
182

183
184
185
186
187
188
189
190
191
192
  - spot::scc_info::determine_unknown_acceptance() incorrectly
    considered some rejecting SCC as accepting.

  - 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
193
194
195
196
  - 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.
197

Maximilien Colange's avatar
Typos    
Maximilien Colange committed
198
199
  - spot::simulation() could incorrectly flag an automaton as
    non-deterministic.
200

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
201
New in spot 2.4 (2017-09-06)
202

203
204
205
206
207
208
209
210
211
212
213
  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.

214
215
  Tools:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
216
217
218
219
220
221
222
223
  - 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).

224
  - genltl learned two generate two new families of formulas:
225
226
227
228
229
230
      --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).

231
  - autfilt learned to build the union (--sum) or the intersection
Maximilien Colange's avatar
Typos    
Maximilien Colange committed
232
233
    (--sum-and) of two languages by putting two automata side-by-side
    and fiddling with the initial states.  This complements the already
234
235
    implemented intersection (--product) and union (--product-or),
    both based on a product.
236

237
  - autfilt learned to complement any alternating automaton with
238
    option --dualize.   (See spot::dualize() below.)
Thomas Medioni's avatar
Thomas Medioni committed
239

240
241
242
243
  - autfilt learned --split-edges to convert labels that are Boolean
    formulas into labels that are min-terms.  (See spot::split_edges()
    below.)

244
245
246
  - autfilt learned --simplify-acceptance to simplify some acceptance
    conditions.  (See spot::simplify_acceptance() below.)

247
248
249
250
  - 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.)

251
252
253
  - The --stats=%c option of tools producing automata can now be
    restricted to count complete SCCs, using %[c]c.

254
255
256
257
258
259
  - 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.

260
261
  Library:

262
263
  - A new library, libspotgen, gathers all functions used to generate
    families of automata or LTL formulas, used by genltl and genaut.
264

265
  - spot::sum() and spot::sum_and() implements the union and the
266
    intersection of two automata by putting them side-by-side and
267
    using non-deterministim or universal branching on the initial
268
    state.
269

270
271
272
  - 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
273
  - spot::dualize() complements any alternating automaton.  Since
274
275
276
    the dual of a deterministic automaton is still deterministic, the
    function spot::dtwa_complement() has been deprecated and simply
    calls spot::dualize().
277

278
279
280
281
282
283
  - 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

284
285
  - The print_dot() function will now display names for well known
    acceptance conditions under the formula when option 'a' is used.
286
287
    We plan to enable 'a' by default in a future release, so a new
    option 'A' has been added to hide the acceptance condition.
288

289
290
291
292
293
  - 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

294
295
296
297
  - 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
298
299
300
301
302
    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
303
304
305
306
307
308
309

      % 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.

310
311
312
313
  - 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".

314
315
316
317
318
  - 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.

319
320
321
322
323
324
  - 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.
325

326
327
328
329
330
  - 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.

331
332
333
334
335
336
337
  - 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.

338
339
340
  - spot::scc_info has two new methods to easily iterate over the
    edges of an SCC: edges_of() and inner_edges_of().

341
342
343
  - spot::scc_info can now be passed a filter function to ignore
    or cut some edges.

344
345
346
347
348
  - 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.

349
350
351
352
353
354
  - 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().

355
356
357
358
359
  - 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.

360
361
362
363
  - 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.

364
  - The function spot::streett_to_generalized_buchi() is now able to
365
    work on automata with Streett-like acceptance.
366

367
368
369
370
371
  - 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.

372
373
374
375
  - 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.
376

377
378
379
380
  - twa_graph::copy_state_names_from() can be used to copy the state
    names from another automaton, honoring "original-states" if
    present.

381
382
  - 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
383
    data-structures are exponential in N.  However a formula like
384
385
386
387
388
389
390
391
      ((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).

392
393
394
395
  - 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).

396
397
398
399
    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]}.

400
401
402
403
  - 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.

404
405
  - spot::sbacc() is can now also convert alternating automata
    to state-based acceptance.
406

407
408
409
  - spot::sbacc() and spot::degeneralize() learned to merge
    accepting sinks.

410
  - If the SPOT_BDD_TRACE environment variable is set, statistics
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
411
412
    about BDD garbage collection and table resizing are shown.

413
  - The & and | operators for acceptannce conditions have been changed
414
    slightly to be more symmetrical.  In older versions, operator &
415
416
417
418
    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
419

420
421
422
423
  - 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).

424
425
426
427
428
429
430
431
432
  - 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
433
  - The parser for HOA now recognizes and verifies correct use of the
434
    "univ-branch" property.  This is known to be a problem with option
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
435
    -H1 of ltl3ba 1.1.2 and ltl3dra 0.2.4, so the environment variable
436
437
    SPOT_HOA_TOLERANT can be set to disable the diagnostic.

438
439
440
441
442
  Python:

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

443
444
445
446
  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
447
    generalized co-Büchi), it would sometimes output an automaton with
448
449
    transition-based acceptance but marked as state-based.

450
451
  - The complete() function could complete an empty co-Büchi automaton
    into an automaton accepting everything.
452

453
454
455
456
457
458
459
460
461
462
  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.

463
464
465
466
467
468
469
  - 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.

470
471
472
  - spot::acc_cond::mark_t::sets() now returns an internal iterable
    object instead of an std::vector<unsigned>.

473
474
475
476
  - 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.

477
  deprecation notices:
478

479
  (these functions still work but compilers emit warnings.)
480

481
482
483
  - spot::decompose_strength() is deprecated, it has been renamed
    to spot::decompose_scc().

484
  - spot::dtwa_complement() is deprecated.  prefer the more generic
485
486
    spot::dualize() instead.

487
  - the spot::twa::prop_deterministic() methods have been renamed to
488
    spot::twa::prop_universal() for consistency with the change to
489
    is_deterministic() listed above.  we have kept
490
491
    spot::twa::prop_deterministic() as a deprecated synonym for
    spot::twa::prop_universal() to help backward compatibility.
492

493
  - the spot::copy() function is deprecated.  use
494
495
    spot::make_twa_graph() instead.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
496
New in spot 2.3.5 (2017-06-22)
497

498
499
  Bugs fixed:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
500
  - We have fixed new cases where translating multiple formulas in a
501
502
    single ltl2tgba run could produce automata different from those
    produced by individual runs.
503

504
505
506
507
508
  - 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.

509
510
511
512
513
514
  - 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
515
516
517
  - Our verson of BuDDy had an incorrect optimization for the
    biimp operator.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
518
New in spot 2.3.4 (2017-05-11)
519

520
521
  Bugs fixed:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
522
  - The transformation to state-based acceptance (spot::sbacc()) was
523
    incorrect on automata where the empty acceptance mark is accepting.
524

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
525
  - The --help output of randaut and ltl2tgba was showing an
526
527
    unsupported %b stat.

528
529
530
  - ltldo and ltlcross could leave temporary files behind when
    aborting on error.

531
532
533
534
  - 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.

535
536
537
538
  - 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
539
New in spot 2.3.3 (2017-04-11)
540

541
542
543
544
545
  Tools:

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

546
  - genltl learned --spec-patterns as an alias for --dac-patterns; it
547
548
549
    also learned two new sets of LTL formulas under --hkrss-patterns
    (a.k.a. --liberouter-patterns) and --p-patterns
    (a.k.a. --beem-patterns).
550

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
551
  Bugs fixed:
552

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
553
554
  - In "lenient" mode the formula parser would fail to recover from a
    missing closing brace.
555

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
556
557
  - The output of 'genltl --r-left=1 --r-right=1 --format=%F' had
    typos.
558

559
560
561
562
  - 'ltl2tgba Fa | autfilt --complement' would incorrectly claim that
    the output is "terminal" because dtwa_complement() failed to reset
    that property.

563
564
565
  - spot::twa_graph::purge_unreachable_states() was misbehaving on
    alternating automata.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
566
567
  - In bench/stutter/ the .cc files were not compiling due to warnings
    being caught as errors.
568

569
570
571
572
573
574
  - 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
575
New in spot 2.3.2 (2017-03-15)
576

577
578
  Tools:

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
579
  - In tools that output automata, the number of atomic propositions
580
    can be output using --stats=%x (output automaton) or --stats=%X
581
    (input automaton).  Additional options can be passed to list
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
582
    atomic propositions instead of counting them.  Tools that output
583
    formulas also support --format=%x for this purpose.
584

585
586
  Python:

587
588
  - The bdd_to_formula(), and to_generalized_buchi() functions can now
    be called in Python.
589

590
591
592
593
594
  Documentation:

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

595
596
597
598
599
  Bugs fixed:

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

600
601
602
  - Because of a typo, the output of --stats='...%P...' was correct
    only if %p was used as well.

603
604
605
  - genltl was never meant to have (randomly attributed) short
    options for --postive and --negative.

606
607
608
609
  - 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).

610
611
  - 'ltl2tgba --any -C -M ...' would not complete automata.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
612
  - While not incorrect, the HOA properties output by 'ltl2tgba -M'
613
614
615
616
    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'.

617
618
619
  - spot::twa_graph::set_univ_init_state() could not be called with
    an initializer list.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
620
  - The Python wrappers for spot::twa_graph::state_from_number and
621
622
    spot::twa_graph::state_acc_sets were broken in 2.3.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
623
  - Instantiating an emptiness check on an automaton with unsupported
624
625
626
627
    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
628
  Deprecation notice:
629
630
631
632

  - 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
633
634
    for consistency with tools producing automata, where %a means
    something else.
635

636

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
637
New in spot 2.3.1 (2017-02-20)
638

639
640
641
642
643
644
  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.

645
646
647
  - The colors used in the output of ltlcross have been adjusted to
    work better with white backgrounds and black backgrounds.

648
649
650
  - The option (y) has been added to --dot. It splits the universal
    edges with the same targets but different colors.

651
652
653
654
655
  - 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.

656
657
658
659
  Library:

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

660
661
662
663
  - 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.

664
665
666
667
668
669
670
  Bugs fixed:

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

  - spot::ltsmin_model::kripke() forgot to register the "dead"
    proposition.
671

672
673
674
675
676
677
  - 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.

678
679
680
  - alternation_removal() was not always reporting the unsupported
    non-weak automata.

681
682
683
684
  - a long-standing typo in the configure code checking for Python
    caused any user-defined CPPFLAGS to be ignored while building
    Spot.

685
686
687
688
  - 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
689
New in spot 2.3 (2017-01-19)
690

691
692
693
694
695
696
697
698
699
700
701
  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.

702
703
704
  * The development Debian packages for Spot now install static
    libraries as well.

705
706
  * We now install configuration files for users of pkg-config.

707
708
  Tools:

709
710
711
  * 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
712
713
    --no-check --product=0 --csv=..." will work with any alternating
    automaton if you just want satistics.
714

715
716
717
718
719
720
  * 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.

721
722
723
  * autfilt has three new filters: --is-very-weak, --is-alternating,
    and --is-semi-deterministic.

724
725
  * the --check option of autfilt/ltl2tgba/ltldo/dstar2tgba can now
    take "semi-determinism" as argument.
726

727
  * autfilt --highlight-languages will color states that recognize
728
    identical languages.  (Only works for deterministic automata.)
729

730
731
732
733
734
  * '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/.
735

736
737
738
739
  * 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
740
    See https://spot.lrde.epita.fr/hierarchy.html
741

742
  * The --format option of ltlfilt/genltl/randltl/ltlgrind learned to
743
    print the class of a formula in the temporal hierarchy of Manna &
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
744
    Pnueli using %h.  See https://spot.lrde.epita.fr/hierarchy.html
745

746
747
748
749
750
751
  * 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.

752
753
754
  * ltldo and ltlcross have learned how to call ltl3hoa, so
    'ltl3hoa -f %f>%O' can be abbreviated to just 'ltl3hoa'.

755
756
757
  Library:

  * A twa is required to have at least one state, the initial state.
758
759
    An automaton can only be empty while it is being constructed,
    but should not be passed to other algorithms.
760

761
  * Couvreur's emptiness check has been rewritten to use the explicit
762
763
    interface when possible, to avoid overkill memory allocations.
    The new version has further optimizations for weak and terminal
764
765
766
    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.
767

768
  * The new version of the Couvreur emptiness check is now the default
769
770
    one, used by twa::is_empty() and twa::accepting_run().  Always
    prefer these functions over an explicit call to Couvreur.
771

772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
  * 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.

790
    - scc_info has been adjusted to handle universal edges as if they
791
792
793
      were existential edges.  As a consequence, acceptance
      information is not accurate.

794
795
796
797
798
799
800
    - 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
801
802
803
    - 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.
804

805
806
807
808
  * 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().
809

810
811
812
813
814
815
  * 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.

816
  * language_map() and highlight_languages() are new functions that
817
    implement autfilt's --highlight-languages option mentionned above.
818

819
  * dtgba_sat_minimize_dichotomy() and dwba_sat_minimize_dichotomy()
820
    use language_map() to estimate a lower bound for binary search.
821

822
  * The encoding part of SAT-based minimization consumes less memory.
823

824
825
826
827
  * 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.
828

829
830
831
832
  * 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).
833

834
835
836
  * The new function mp_class(f) returns the class of the formula
    f in the temporal hierarchy of Manna & Pnueli.

837
838
839
840
841
842
843
844
845
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.

846
Bugs fixed:
847
848
849
850
851
852
853
854

  * 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.

855
856
857
858
  * 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.

859
860
861
862
  * 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.

863
864
865
  * 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
866
New in spot 2.2.2 (2016-12-16)
867

868
869
870
871
872
  Build:

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

873
874
875
876
  Bug fixes:

  * scc_filter() had a left-over print statement that would print
    "names" when copying the name of the states.
877

878
879
880
881
882
  * 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.

883
884
885
886
887
  * 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.

888
889
890
891
  * Some of the installed headers (spot/misc/fixpool.hh,
    spot/misc/mspool.hh, spot/twaalgos/emptiness_stats.hh) were not
    self-contained.

892
893
894
  * ltlfilt --from-ltlf should ensure that "alive" holds initially in
    order to reject empty traces.

895
896
897
  * 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
898
New in spot 2.2.1 (2016-11-21)
899

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
900
  Bug fix:
901

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
902
903
  * The bdd_noderesize() function, as modified in 2.2, would always
    crash.
904

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
905
New in spot 2.2 (2016-11-14)
906

907
908
909
910
911
912
  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
913
914
915
916
  * "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.

917
918
919
  * 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
920
921
922
923
    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
924

925
926
  Library:

927
928
929
  * from_ltlf() is a new function implementing the --from-ltlf
    transformation described above.

930
  * is_unambiguous() was rewritten in a more efficient way.
931

932
  * scc_info learned to determine the acceptance of simple SCCs made
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
933
    of a single self-loop without resorting to remove_fin() for complex
934
935
936
937
938
939
    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.
940

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
941
942
  * Simulation-based reductions now implement just bisimulation-based
    reductions on deterministic automata, to save time.  As an example,
943
944
945
    this halves the run time of
       genltl --rv-counter=10 | ltl2tgba

946
947
  * scc_filter() learned to preserve state names and highlighted states.

948
949
950
951
952
  * 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).

953
954
955
956
957
958
959
960
  * 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
961
962
963
    with any Fin-acceptance removal performed before the product.
    However the plan is to implement these more efficiently in the
    future.
964

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
965
  Bug fixes:
966

967
  * ltl2tgba was always using the highest settings for the LTL
968
969
970
971
    simplifier, ignoring the --low and --medium options.  Now
      genltl --go-theta=12 | ltl2tgba --low --any
    is instantaneous as it should be.

972
973
974
  * 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.)
975

976
977
978
  * 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
979
  * Running the LTL parser in debug mode would crash.
980

981
  * tgba_determinize() could produce incorrect deterministic automata
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
982
    when run with use_simulation=true (the default) on non-simplified
983
984
    automata.

985
986
  * When the automaton_stream_parser reads an automaton from an
    already opened file descriptor, it will not close the file
987
988
989
990
    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.
991

992
993
994
  * remove_fin() could produce incorrect result on incomplete
    automata tagged as weak and deterministic.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
995
996
997
  * 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.
998

999
  * Some buffering issue caused syntax errors to be displayed out
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1000
    of place by the on-line translator.
1001

1002
New in spot 2.1.2 (2016-10-14)
1003

1004
1005
1006
1007
1008
1009
  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.

1010
1011
1012
1013
1014
1015
  * 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.

1016
1017
1018
1019
1020
1021
1022
1023
  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)).

1024
1025
  Bug fixes:

1026
  * Fix spurious uninitialized read reported by valgrind when
1027
    is_Kleene_star() is compiled by clang++.
1028

1029
  * Using "ltlfilt some-large-file --some-costly-filter" could take
1030
1031
1032
1033
1034
1035
1036
    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.

1037
1038
1039
1040
  * 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.
1041

1042
1043
  * Fix ltlcross crash when combining --no-check with --verbose.

1044
1045
1046
  * 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
1047
New in spot 2.1.1 (2016-09-20)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1048

1049
1050
1051
  Command-line tools:

  * ltlfilt, randltl, genltl, and ltlgrind learned to display the size
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1052
    (%s), Boolean size (%b), and number of atomic propositions (%a)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1053
1054
    with the --format and --output options.  A typical use-case is to
    sort formulas by size:
1055
1056
1057
1058
       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'

1059
1060
1061
  * autfilt --stats learned the missing %D, %N, %P, and %W sequences,
    to complete the existing %d, %n, %p, and %w.

1062
  * The --stats %c option of ltl2tgba, autfilt, ltldo, and dstar2tgba
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1063
    now accepts options to filter the SCCs to count.  For instance
1064
1065
1066
    --stats='%[awT]c' will count the SCCs that are (a)ccepting and
    (w)eak, but (not t)erminal.  See --help for all supported filters.

1067
1068
1069
  Bugs fixed:

  * Fix several cases where command-line tools would fail to diagnose
1070
    write errors (e.g. when writing to a filesystem that is full).
1071
  * Typos in genltl --help and in the man page spot-x(7).
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1072

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1073
New in spot 2.1 (2016-08-08)
1074

1075
1076
  Command-line tools:

1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
  * 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.

1103
1104
1105
  * ltldo has a new option --errors=... to specify how to deal
    with errors from executed tools.

1106
1107
  * ltlcross and ltldo learned to bypass the shell when executing
    simple commands (with support for single or double-quoted
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
    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.
1126

1127
1128
  * autfilt learned to filter automata by count of SCCs (--sccs=RANGE)
    or by type of SCCs (--accepting-sccs=RANGE,
1129
1130
1131
    --rejecting-sccs=RANGE, trivial-sccs=RANGE, --terminal-sccs=RANGE,
    --weak-sccs=RANGE, --inherently-weak-sccs=RANGE).

1132
  * autfilt learned --remove-unused-ap to remove atomic propositions
1133
1134
    that are declared in the input automaton, but not actually used.
    This of course makes sense only for input/output formats that
1135
    declare atomic propositions (HOA & DSTAR).
1136

1137
  * autfilt learned two options to filter automata by count of used or
1138
1139
1140
1141
    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.

1142
1143
  * autfilt learned to filter automata by count of nondeterministsic
    states with --nondet-states=RANGE.
1144

1145
  * autfilt learned to filter automata representing stutter-invariant
1146
1147
    properties with --is-stutter-invariant.

1148
  * autfilt learned two new options to highlight non-determinism:
1149
    --highlight-nondet-states=NUM and --highlight-nondet-states=NUM
1150
1151
    where NUM is a color number.  Additionally --highlight-nondet=NUM is
    a shorthand for using the two.
1152

1153
  * autfilt learned to highlight a run matching a given word using the
1154
1155
1156
    --highlight-word=[NUM,]WORD option.  However currently this only
    work on automata with Fin-less acceptance.

1157
1158
1159
  * autfilt learned two options --generalized-rabin and
    --generalized-streett to convert the acceptance conditions.

1160
  * genltl learned three new families: --dac-patterns=1..45,
1161
1162
1163
    --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 &
1164
    Holzmann (Concur'00), Somenzi & Bloem (CAV'00).
1165

1166
1167
  * genltl learned two options, --positive and --negative, to control
    wether formulas should be output after negation or not (or both).
1168

1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
  * 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.

1182
1183
  * The --stats option of autfilt, dstar2tgba, ltl2tgba, ltldo,
    randaut learned to display the output (or input if that makes
1184
    sense) automaton as a HOA one-liner using %h (or %H), helping to
1185
1186
    create CSV files contained automata.

1187
1188
1189
1190
  * autfilt and dstar2tgba learned to read automata from columns in
    CSV files, specified using the same filename/COLUMN syntax used by
    tools reading formulas.

1191
1192
1193
  * 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
1194
    check is done for the arguments of autfilt --sat-minimize=...
1195

1196
1197
1198
1199
1200
1201
1202
1203
1204
  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.

1205
1206
1207
1208
1209
1210
1211
  * 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

1212
1213
1214
  * highlight_nondet_states() and highlight_nondet_edges() are
    new functions that define the above two named properties.

1215
  * is_deterministic(), is_terminal(), is_weak(), and
1216
1217
1218
    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
1219
    their check.
1220

1221
1222
1223
1224
1225
1226
  * 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.

1227
1228
1229
1230
  * to_generalized_rabin() and to_generalized_streett() are two new
    functions that convert the acceptance condition as requested
    without changing the transition structure.

1231
1232
1233
  * language_containment_checker now has default values for all
    parameters of its constructor.

1234
1235
1236
1237
  * 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.

1238
1239
1240
1241
    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.

1242
1243
  * 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
1244
    what their names suggest.  Note that twa::accepting_run(), unlike
1245
1246
1247
    the two others, is currently restricted to automata with Fin-less
    acceptance.

1248
1249
1250
1251
1252
  * 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.

1253
  * New LTL and PSL simplification rules:
1254
1255
    - 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
1256
1257
    - {s[*0..j]}[]->b = {s[*1..j]}[]->b
    - {s[*0..j]}<>->b = {s[*1..j]}<>->b
1258

1259
1260
1261
1262
  * spot::twa::succ_iterable renamed to
    spot::internal::twa_succ_iterable to make it clear this is not for
    public consumption.

1263
1264
1265
1266
1267
  * 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.

1268
1269
  Python:

1270
  * The __format__() method for formula supports the same
1271
1272
1273
1274
    operator-rewritting feature introduced in ltldo and ltlcross.
    So "{:[i]s}".format(f) is the same as
    "{:s}".format(f.unabbreviate("i")).

1275
1276
  * Bindings for language_containment_checker were added.

1277
1278
  * Bindings for randomize() were added.

1279
1280
1281
  * Iterating over edges via "aut.out(s)" or "aut.edges()"
    now allows modifying the edge fields.

1282
  * Under IPython the spot.ltsmin module now offers a