NEWS 114 KB
Newer Older
1
2
New in spot 1.99.7a (not yet released)

3
4
5
6
7
  Library:

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

8
9
10
  * The load_ltsmin() function has been split in two.  Now you should
    first call ltsmin_model::load(filename) to create an ltlmin_model,
    and then call the ltsmin_model::kripke(...) method to create an
11
12
13
    automaton that can be iterated on the fly.  The intermediate
    object can be queried about the supported variables and their
    types.
14

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
15
16
17
18
19
20
21
  * print_dot() now accepts an option of the form "<N" to specify
    a maximum number of states to output.  Incomplete states are
    then marked appropriately.  For a quick example, compare
       ltl2tgba -D 'Ga | Gb | Gc' -d'<3'
    with
       ltl2tgba -D 'Ga | Gb | Gc' -d

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
22
23
24
25
  * print_dot() now has option "k" to use state-based labels when
    possible.  This is similar to the "k" option already supported
    by print_hoa(), and is useful when printing Kripke structures.

26
27
28
29
30
  Python:

  * The ltsmin interface has been binded in Python.  See
    https://spot.lrde.epita.fr/ipynb/ltsmin.html for a short example.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
31
32
33
34
35
  * spot.setup() sets de maximum number of states to display in
    automata to 50 by default, as more states is likely to be
    unreadable (and slow to process by GraphViz).  This can be
    overridden by calling spot.setup(max_states=N).

36
37
38
39
40
  Documentation:

  * There is a new page giving informal illustrations (and extra
    pointers) for some concepts used in Spot.
    See https://spot.lrde.epita.fr/concepts.html
41

42
43
44
45
46
  Bugs:

  * Using ltl2tgba -U would fail to output the unambiguous property
    (regression introduced in 1.99.7)

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
47
New in spot 1.99.7 (2016-01-15)
48
49
50

  Command-line tools:

51
  * BACKWARD INCOMPATIBLE CHANGE: All tools that output automata now
52
    use the HOA format by default instead of the GraphViz output.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
53
    This makes it easier to pipe several commands together.
54
55
56
57
58
59

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

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
60
61
62
  * Tools that output automata now accept -d as a shorthand for --dot
    since requesting the GraphViz (a.k.a. dot) output by hand is now
    more frequent.
63
64
    randaut's short option for specifying edge-density used to be -d:
    it has been renamed to -e.
65

66
  * The SPOT_DEFAULT_FORMAT environment variable can be set to 'dot'
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
67
68
    or 'hoa' to force a default output format for automata.  Additional
    options may also be added, as in SPOT_DEFAULT_FORMAT='hoa=iv'.
69

70
71
  * autfilt has a new option: --is-inherently-weak.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
72
73
74
  * The --check=strength option of all tools that produce automata
    will also test if an automaton is inherently weak.

75
76
  Library:

77
78
79
80
81
82
83
84
85
  * Installed headers now assume that they will be included as
    #include <spot/subdir/header.hh>
    instead of
    #include <subdir/header.hh>

    This implies that when Spot headers are installed in
    /usr/include/spot/... (the default when using the Debian packages)
    or /usr/local/include/spot/... (the default when compiling from
    source), then it is no longuer necessary to add
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
86
87
88
    -I/usr/include/spot or -I/usr/local/include/spot when compiling,
    as /usr/include and /usr/local/include are usually searched by
    default.
89
90
91
92

    Inside the source distribution, the subdirectory src/ has been
    renamed to spot/, so that the root of the source tree can also be
    put on the preprocessor's search path to compile against a
93
94
    non-installed version of Spot.  Similarly, iface/ltsmin/ has been
    renamed to spot/ltsmin/, so that installed and non-installed
95
    directories can be used similarly.
96

97
98
99
100
  * twa::~twa() is now calling
      get_dict()->unregister_all_my_variable(this);
    so this does not need to be done in any subclass.

101
102
103
104
  * is_inherently_weak_automaton() is a new function, and
    check_strength() has been modified to also check inherently weak
    automata.

105
106
107
108
  * decompose_strength() is now extracting inherently weak SCCs
    instead of just weak SCCs.  This gets rid of some corner cases
    that used to require ad hoc handling.

109
110
111
112
  * acc_cond::acc_code's methods append_or(), append_and(), and
    shift_left() have been replaced by operators |=, &=, <<=, and for
    completeness the operators |, &, and << have been added.

113
114
115
  * Several methods have been removed from the acc_cond
    class because they were simply redundant with the methods of
    acc_cond::mark_t, and more complex to use.
116

117
       acc_cond::marks(...)      -> use acc_cond::mark_t(...)
118
       acc_cond::sets(m)         -> use m.sets()
119
       acc_cond::has(m, u)       -> use m.has(u)
120
121
122
123
       acc_cond::cup(l, r)       -> use l | r
       acc_cond::cap(l, r)       -> use l & r
       acc_cond::set_minus(l, r) -> use l - r

124
    Additionally, the following methods/functions have been renamed:
125
126
127

       acc_cond::is_tt() -> acc_cond::is_t()
       acc_cond::is_ff() -> acc_cond::is_f()
128
       parse_acc_code()  -> acc_cond::acc_code(...)
129

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
130
  * Automata property flags (those that tell whether the automaton is
131
132
133
    deterministic, weak, stutter-invariant, etc.) are now stored using
    three-valued logic: in addition to "maybe"/"yes" they can now also
    represent "no".  This is some preparation for the upcomming
134
135
136
137
138
139
140
141
    support of the HOA v1.1 format, but it also saves time in some
    algorithms (e.g, is_deterministic() can now return immediately on
    automata marked as not deterministic).

  * The automaton parser now accept negated properties as they will be
    introduced in HOA v1.1, and will check for some inconsistencies.
    These properties are stored and used when appropriate, but they
    are not yet output by the HOA printer.
142

143
144
  Python:

145
146
147
148
  * Iterating over the transitions leaving a state (the
    twa_graph::out() C++ function) is now possible in Python.  See
    https://spot.lrde.epita.fr/tut21.html for a demonstration.

149
150
151
152
  * Membership to acceptance sets can be specified using Python list
    when calling for instance the Python version of twa_graph::new_edge().
    See https://spot.lrde.epita.fr/tut22.html for a demonstration.

153
154
155
  * Automaton states can be named via the set_state_names() method.
    See https://spot.lrde.epita.fr/ipynb/product.html for an example.

156
157
158
159
160
  Documentation:

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

161
162
163
164
165
  * Python bindings for manipulating acceptance conditions are
    demonstrated by https://spot.lrde.epita.fr/ipynb/acc_cond.html,
    and a Python implementation of the product of two automata is
    illustrated by https://spot.lrde.epita.fr/ipynb/product.html

166
167
168
169
170
171
172
173
174
175
176
177
  Source code reorganisation:

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

178
179
  Bug fixes:

180
181
  * twa_graph would incorrectly replace named-states during
    purge_dead_states and purge_unreachable_states.
182
183
  * twa::ap() would contain duplicates when an atomic proposition
    was registered several times.
184
185
  * product() would incorrectly mark the product of two
    sttuter-sensitive automata as stutter-sensitive as well.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
186
187
  * complete() could incorrectly reuse an existing (but accepting!)
    state as a sink.
188

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
189
New in spot 1.99.6 (2015-12-04)
190

191
192
  Command-line tools:

193
194
195
196
  * autfilt has two new filters: --is-weak and --is-terminal.

  * autfilt has a new transformation: --decompose-strength,
    implementing the decomposition of our TACAS'13 paper.
197
198
    A demonstration of this feature via the Python bindings
    can be found at https://spot.lrde.epita.fr/ipynb/decompose.html
199

200
201
202
203
204
205
  * All tools that output HOA files accept a --check=strength option
    to request automata to be marked as "weak" or "terminal" as
    appropriate.  Without this option, these properties may only be
    set as a side-effect of running transformations that use this
    information.

206
207
208
209
210
211
212
  Library:

  * Properties of automata (like the "properties:" line of the HOA
    format) are stored as bits whose interpretation is True=yes,
    False=maybe.  Having getters like "aut->is_deterministic()" or
    "aut->is_unambiguous()" was confusing, because there are separate
    functions "is_deterministic(aut)" and "is_unambiguous(aut)" that
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
213
214
    do actually check the automaton.  The getters have been renamed to
    avoid confusion, and get names more in line with the HOA format.
215
216
217
218
219
220
221
222
223

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

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
224
    The setters have the same names as the getters, except they take a
225
226
227
    Boolean argument.  This argument used to be optionnal (defaulting
    to True), but it no longer is.

228
229
230
231
232
233
234
235
236
237
  * Automata now support the "weak" and "terminal" properties in
    addition to the previously supported "inherently-weak".

  * By default the HOA printer tries not to bloat the output with
    properties that are redundant and probably useless.  The HOA
    printer now has a new option "v" (use "-Hv" from the command line)
    to output more verbose "properties:".  This currently includes
    outputing "no-univ-branch", outputting "unambiguous" even for
    automata already tagged as "deterministic", and "inherently-weak"
    or "weak" even for automata tagged "weak" or "terminal".
238

239
240
241
242
  * The HOA printer has a new option "k" (use "-Hk" from the command
    line) to output automata using state labels whenever possible.
    This is useful to print Kripke structures.

243
244
245
246
247
  * The dot output will display pair of states when displaying an
    automaton built as an explicit product.  This works in IPython
    with spot.product() or spot.product_or() and in the shell with
    autfilt's --product or --product-or options.

248
249
250
251
252
253
254
  * The print_dot() function supports a new option, +N, where N is a
    positive integer that will be added to all set numbers in the
    output.  This is convenient when displaying two automata before
    building their product: use +N to shift the displayed sets of the
    second automaton by the number of acceptance sets N of the first
    one.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
255
  * The sat minimization for DTωA now does a better job at selecting
256
257
258
259
260
    reference automata when the output acceptance is the the same as
    the input acceptance.  This can provide nice speedups when tring
    to syntethise larged automata with different acceptance
    conditions.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
261
  * Explicit Kripke structures (i.e., stored as explicit graphs) have
262
    been rewritten above the graph class, using an interface similar
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
263
264
    to the twa class.  The new class is called kripke_graph.  The ad
    hoc Kripke parser and printer have been removed, because we can
265
266
    now use print_hoa() with the "k" option to print Kripke structure
    in the HOA format, and furthermore the parse_aut() function now
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
267
    has an option to load such an HOA file as a kripke_graph.
268

269
270
271
272
  * The HOA parser now accepts identifier, aliases, and headernames
    containing dots, as this will be allowed in the next version of
    the HOA format.

273
274
  * Renamings:
    is_guarantee_automaton() -> is_terminal_automaton()
275
    tgba_run -> twa_run
276
    twa_word::print -> operator<<
277
278
    dtgba_sat_synthetize() -> dtwa_sat_synthetize()
    dtgba_sat_synthetize_dichotomy() -> dtwa_sat_synthetize_dichotomy()
279

280
  Python:
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
281

282
  * Add bindings for is_unambiguous().
283
  * Better interface for sat_minimize().
284

285
  Bug fixes:
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
286

287
  * the HOA parser was ignoring the "unambiguous" property.
288
289
  * --dot=Bb should work like --dot=b, allowing us to disable
    a B option set via an environment variable.
290

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
291
New in spot 1.99.5 (2015-11-03)
292

293
294
295
  Command-line tools:

  * autfilt has gained a --complement option.
296
    It currently works only for deterministic automata.
297

298
  * By default, autfilt does not simplify automata (this has not
299
    changed), as if the --low --any options were used.  But now, if
300
301
302
    one of --small, --deterministic, or --any is given, the
    optimization level automatically defaults to --high (unless
    specified otherwise).  For symmetry, if one of --low, --medium, or
303
    --high is given, then the translation intent defaults to --small
304
305
    (unless specified otherwise).

306
307
308
309
  * autfilt, dstar2tgba, ltlcross, and ltldo now trust the (supported)
    automaton properties declared in any HOA file they read.  This can
    be disabled with option --trust-hoa=no.

310
311
312
  * ltlgrind FILENAME[/COL] is now the same as
    ltlgrind -F FILENAME[/COL] for consistency with ltlfilt.

313
314
  Library:

315
316
317
318
319
  * dtgba_complement() was renamed to dtwa_complement(), moved to
    complement.hh, and its purpose was restricted to just completing
    the automaton and complementing its acceptance condition.  Any
    further acceptance condition transformation can be done with
    to_generalized_buchi() or remove_fin().
320
321
322
323
324

  * The remove_fin() has learnt how to better deal with automata that
    are declared as weak.  This code was previously in
    dtgba_complement().

325
326
327
328
329
  * scc_filter_states() has learnt to remove useless acceptance marks
    that are on transitions between SCCs, while preserving state-based
    acceptance.  The most visible effect is in the output of "ltl2tgba
    -s XXXa": it used to have 5 accepting states, it now has only one.
    (Changing removing acceptance of those 4 states has no effect on
330
    the language, but it speeds up some algorithms like NDFS-based
331
332
    emptiness checks, as discussed in our Spin'15 paper.)

333
334
335
  * The HOA parser will diagnose any version that is not v1, unless it
    looks like a subversion of v1 and no parse error was detected.

336
  * The way to pass option to the automaton parser has been changed to
337
    make it easier to introduce new options.  One such new option is
338
339
    "trust_hoa": when true (the default) supported properties declared
    in HOA files are trusted even if they cannot be easily be verified.
340
341
342
343
344
    Another option "raise_errors" now replaces the method
      automaton_stream_parser::parse_strict().

  * The output of the automaton parser now include the list of parse
    errors (that does not have to be passed as a parameters) and the
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
345
    input filename (making the output of error messages easier).
346

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
347
  * The following renamings make the code more consistent:
348
349
350
    ltl_simplifier -> tl_simplifier
    tgba_statistics::transitions -> twa_statistics::edges
    tgba_sub_statistics::sub_transitions -> twa_sub_statistics::transitions
351
    tgba_run -> twa_run
352
    reduce_run -> twa_run::reduce
353
354
355
356
    replay_tgba_run -> twa_run::replay
    print_tgba_run -> operator<<
    tgba_run_to_tgba -> twa_run::as_twa
    format_parse_aut_errors -> parsed_aut::format_errors
357
358
359
360
361
362
    twa_succ_iterator::current_state -> twa_succ_iterator::dst
    twa_succ_iterator::current_condition -> twa_succ_iterator::cond
    twa_succ_iterator::current_acceptance_conditions -> twa_succ_iterator::acc
    ta_succ_iterator::current_state -> ta_succ_iterator::dst
    ta_succ_iterator::current_condition -> ta_succ_iterator::cond
    ta_succ_iterator::current_acceptance_conditions -> ta_succ_iterator::acc
363

364
365
  Python:

366
  * The minimum supported Python version is now 3.3.
367
  * Add bindings for complete() and dtwa_complement()
368
369
  * Formulas now have a custom __format__ function.  See
    https://spot.lrde.epita.fr/tut01.html for examples.
370
371
  * The Debian package is now compiled for all Python3 versions
    supported by Debian, not just the default one.
372
  * Automata now have get_name()/set_name() methods.
373
374
375
  * spot.postprocess(aut, *options), or aut.postprocess(*options)
    simplify the use of the spot.postprocessor object.  (Just like we
    have spot.translate() on top of spot.translator().)
376
377
378
379
380
381
382
383
  * spot.automata() and spot.automaton() now have additional
    optional arguments:
    - timeout: to restrict the runtime of commands that
      produce automata
    - trust_hoa: can be set to False to ignore HOA properties
      that cannot be easily verified
    - ignore_abort: can be set to False if you do not want to
      skip automata ended with --ABORT--.
384

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
385
386
387
388
389
390
  Documentation:

  * There is a new page showing how to use spot::postprocessor
    to convert any type of automaton to Büchi.
    https://spot.lrde.epita.fr/tut30.html

391
392
  Bugs fixed:

393
  * Work around some weird exception raised when using the
394
395
396
397
398
    randltlgenerator under Python 3.5.
  * Recognize "nullptr" formulas as None in Python.
  * Fix compilation of bench/stutter/
  * Handle saturation of formula reference counts.
  * Fix typo in the Python code for the CGI server.
399
  * "randaut -Q0 1" used to segfault.
400
401
  * "ltlgrind -F FILENAME/COL" did not preserve other CSV columns.
  * "ltlgrind --help" did not document FORMAT.
402
  * unabbreviate could easily use forbidden operators.
403
404
  * "autfilt --is-unambiguous" could fail to detect the nonambiguity
    of some automata with empty languages.
405
406
407
  * When parsing long tokens (e.g, state labels representing
    very large strings) the automaton parser could die with
    "input buffer overflow, can't enlarge buffer because scanner uses REJECT"
408

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
409
New in spot 1.99.4 (2015-10-01)
410

411
412
  New features:

413
414
415
416
  * autfilt's --sat-minimize now takes a "colored" option to constrain
    all transitions (or states) in the output automaton to belong to
    exactly one acceptance sets.  This is useful when targeting parity
    acceptance.
417

418
419
420
421
422
423
424
425
426
427
  * autfilt has a new --product-or option.  This builds a synchronized
    product of two (completed of needed) automata in order to
    recognize the *sum* of their languages.  This works by just using
    the disjunction of their acceptance conditions (with appropriate
    renumbering of the acceptance sets).

    For consistency, the --product option (that builds a synchronized
    product that recognizes the *intersection* of the languages) now
    also has a --product-and alias.

428
429
430
431
432
433
434
435
436
437
  * the parser for ltl2dstar's format has been merged with the parser
    for the other automata formats.  This implies two things:
    - autfilt and dstar2tgba (despite its name) can now both read
      automata written in any of the four supported syntaxes
      (ltl2dstar's, lbtt's, HOA, never claim).
    - "dstar2tgba some files..." now behaves exactly like
      "autfilt --tgba --high --small some files...".
      (But dstar2tgba does not offer all the filtering and
      transformations options of autfilt.)

438
439
  Major code changes and reorganization:

440
441
442
  * The class hierarchy for temporal formulas has been entirely
    rewritten.  This change is actually quite massive (~13200 lines
    removed, ~8200 lines added), and brings some nice benefits:
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
443
    - LTL/PSL formulas are now represented by lightweight formula
444
445
446
447
      objects (instead of pointers to children of an abstract
      formula class) that perform reference counting automatically.
    - There is no hierachy anymore: all operators are represented by
      a single type of node in the syntax tree, and an enumerator is
448
      used to distinguish between operators.
449
450
451
452
453
454
455
456
    - Visitors have been replaced by member functions such as map()
      or traverse(), that take a function (usually written as a
      lambda function) and apply it to the nodes of the tree.
    - As a consequence, writing algorithms that manipulate formula
      is more friendly, and several algorithms that spanned a few
      pages have been reduced to a few lines.
    The page https://spot.lrde.epita.fr/tut03.html illustrates the
    new interface, in both C++ and Python.
457

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
458
459
460
461
462
  * Directories ltlast/, ltlenv/, and ltlvisit/, have been merged into
    a single tl/ directory (for temporal logic).  This is motivated by
    the fact that these formulas are not restricted to LTL, and by the
    fact that we no longuer use the "visitor" pattern.

463
464
465
  * The LTL/PSL parser is now declared in tl/parse.hh (instead of
    ltlparse/public.hh).

466
467
468
469
470
471
472
473
474
475
476
  * The spot::ltl namespace has been merged with the spot namespace.

  * The dupexp_dfs() function has been renamed to copy(), and has
    learned to preserve named states if required.

  * Atomic propositions can be declared without going through an
    environment using the spot::formula::ap() static function.  They
    can be registered for an automaton directly using the
    spot::twa::register_ap() method.  The vector of atomic
    propositions used by an automaton can now be retrieved using the
    spot::twa::ap() method.
477

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
478
New in spot 1.99.3 (2015-08-26)
479

480
481
482
  * The CGI script for LTL translation offers a HOA download link
    for each generated automaton.

483
  * The html documentation now includes a HTML copies of the man
484
    pages, and HTML copies of the Python notebooks.
485

486
487
488
489
  * scc_filter(aut, true) does not remove Fin marks from rejecting
    SCCs, but it now does remove Fin marks from transitions between
    SCCs.

490
491
492
  * All the unabbreviation functions (unabbreviate_ltl(),
    unabbreviate_logic(), unabbreviate_wm()) have been merged into a
    single unabbreviate() function that takes a string representing
493
494
495
    the list of operators to remove among "eFGiMRW^" where 'e', 'i',
    and '^' stand respectively for <->, ->, and xor.
    This feature is also available via ltlfilt --unabbreviate.
496

497
498
499
500
  * In LTL formulas, atomic propositions specified using double-quotes
    can now include \" and \\.  (This is more consistent with the HOA
    format, which already allows that.)

501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
  * All the conversion routines that were written specifically for
    ltl2dstar's output format (DRA->BA & DRA->TGBA) have been ported
    to the new TωA structure supporting the HOA format.  The DRA->TGBA
    conversion was reimplemented in the previous release, and the
    DRA->BA conversion has been reimplemented in this release (but it
    is still restricted to state-based acceptance).  All these
    conversions are called automatically by to_generalized_buchi()
    or remove_fin() so there should be no need to call them directly.

    As a consequence:
    - "autfilt --remove-fin" or "autfilt -B" is better at converting
      state-based Rabin automata: it will produce a DBA if the input is
      deterministic and DBA-realizable, but will preserve as much
      determinism as possible otherwise.
    - a lot of obsolete code that was here only to support the old
      conversion routines has been removed.  (The number of lines
      removed by this release is twice the number of lines added.)
    - ltlcross now uses automata in ltl2dstar's format directly,
      without converting them to Büchi (this makes the statistics
      reported in CSV files more relevant).
    - ltlcross no longer outputs additional columns about the size
      of the input automaton in the case ltl2dstar's format is used.
    - ltldo uses results in ltl2dstar's format directly, without
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
524
      converting them to Büchi.
525
526
    - dstar2tgba has been greatly simplified and now uses the
      same output routines as all the other tools that output
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
527
      automata.  This implies a few minor semantic changes, for
528
      instance --stats=%A used to output the number of acceptance
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
529
      *pairs* in the input automaton, while it now outputs the
530
531
      number of acceptance sets like in all the other tools.

532
533
  * Bugs fixed
    - Some acceptance conditions like Fin(0)|Fin(1)|Fin(2)&Inf(3)
534
      were not detected as generalized-Rabin.
535
536
    - Unknown arguments for print_hoa() (i.e., option -H in command-line
      tools) are now diagnosed.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
537
    - The CGI script for LTL translation now forces transition-based
538
539
540
541
      acceptance on WDBA-minimized automata when TGBA is requested.
    - ltlgrind --help output had some options documented twice, or
      in the wrong place.
    - The man page for ltlcross had obsolete examples.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
542
543
    - When outputting atomic propositions in double quotes, the
      escaping routine used by the two styles of LaTeX output was
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
544
545
      slightly wrong.  For instance ^ was incorrectly escaped, and
      the double quotes where not always properly rendered.
546
547
    - A spurious assertion was triggered by streett_to_generalized_buchi(),
      but only when compiled in DEBUG mode.
548
    - LTL formula rewritten in Spin's syntax no longer have their ->
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
549
      and <-> rewritten away.
550
    - Fix some warnings reported by the development version of GCC 6.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
551
    - The spot.translate() function of the Python binding had a typo
552
      preventing the use of 'low'/'medium'/'high' as argument.
553
    - Fix spurious failure of uniq.test under different locales.
554
555
    - ltlcross now recovers from out-of-memory errors during
      state-space products.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
556
557
    - bitvect.test was failing on 32bit architectures with
      assertions enabled because of a bug in the test case.
558

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
559
New in spot 1.99.2 (2015-07-18)
560

561
  * The scc_info object, used to build a map of SCCs while gathering
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
562
    additional information, has been simplified and speed up.  One
563
    test case where ltlcross would take more than 13min (to check the
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
564
    translation of one PSL formula) now takes only 75s.
565

566
567
568
  * streett_to_generalized_buchi() is a new function that implements
    what its name suggests, with some SCC-based optimizations over the
    naive definition.  It is used by the to_generalized_buchi() and
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
569
    remove_fin() functions when the input automaton is a Streett
570
571
572
573
574
575
576
577
578
    automaton with more than 3 pairs (this threeshold can be changed
    via the SPOT_STREETT_CONV_MIN environment variable -- see the
    spot-x(7) man page for details).

    This is mainly useful to ltlcross, which has to get rid of "Fin"
    acceptance to perform its checks.  As an example, the Streett
    automaton generatated by ltl2dstar (configured with ltl2tgba) for
    the formula
      !((GFa -> GFb) & (GFc -> GFd))
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
579
580
581
582
    has 4307 states and 14 acceptance sets.  The new algorithm can
    translate it into a TGBA with 9754 states and 7 acceptance sets,
    while the default approch used for converting any acceptance
    to TGBA would produce 250967 states and 7 acceptance sets.
583

584
  * Bugs fixed:
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
585
    - p[+][:*2] was not detected as belonging to siPSL.
586
587
    - scc_filter() would incorrectly remove Fin marks from
      rejecting SCCs.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
588
    - the libspotltsmin library is installed.
589
    - ltlcross and ltldo did not properly quote atomic propositions
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
590
591
      and temporary file names containing a single-quote.
    - a missing Python.h is now diagnosed at ./configure time, with
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
592
593
594
595
      the suggestion to either install python3-devel, or run
      ./configure --disable-python.
    - Debian packages for libraries have been split from
      the main Spot package, as per Debian guidelines.
596

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
597
New in spot 1.99.1 (2015-06-23)
598

599
600
601
602
603
  * Major changes motivating the jump in version number

    - Spot now works with automata that can represent more than
      generalized Büchi acceptance.  Older versions were built around
      the concept of TGBA (Transition-based Generalized Büchi
604
      Automata) while this version now deals with what we call TωA
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
      (Transition-based ω-Automata).  TωA support arbitrary acceptance
      conditions specified as a Boolean formula of transition sets
      that must be visited infinitely often or finitely often.  This
      genericity allows for instance to represent Rabin or Streett
      automata, as well as some generalized variants of those.

    - Spot has near complete support for the Hanoi Omega Automata
      format.  http://adl.github.io/hoaf/  This formats supports
      automata with the generic acceptance condition described above,
      and has been implemented in a number of third-party tools (see
      http://adl.github.io/hoaf/support.html) to ease their
      interactions.  The only part of the format not yet implemented in
      Spot is the support for alternating automata.

    - Spot is now compiling in C++11 mode.  The set of C++11 features
      we use requires GCC >= 4.8 or Clang >= 3.5.  Although GCC 4.8 is
      more than 2-year old, people with older installations won't be
      able to install this version of Spot.

624
    - As a consequence of the switches to C++11 and to TωA, a lot of
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
      the existing C++ interfaces have been renamed, and sometime
      reworked.  This makes this version of Spot not backward
      compatible with Spot 1.2.x.  See below for the most important
      API changes.  Furtheremore, the reason this release is not
      called Spot 2.0 is that we have more of those changes planned.

    - Support for Python 2 was dropped.  We now support only Python
      3.2 or later.  The Python bindings have been improved a lot, and
      include some conveniance functions for better integration with
      IPython's rich display system.  User familiar with IPython's
      notebook should have a look at the notebook files in
      wrap/python/tests/*.ipynb

  * Major news for the command-line tools

    - The set of tools installed by spot now consists in the following
      11 commands.  Those marked with a '+' are new in this release.

      - randltl    Generate random LTL/PSL formulas.
      - ltlfilt    Filter and convert LTL/PSL formulas.
      - genltl     Generate LTL formulas from scalable patterns.
      - ltl2tgba   Translate LTL/PSL formulas into Büchi automata.
      - ltl2tgta   Translate LTL/PSL formulas into Testing automata.
      - ltlcross   Cross-compare LTL/PSL-to-Büchi translators.
      + ltlgrind   Mutate LTL/PSL formula.
      - dstar2tgba Convert deterministic Rabin or Streett automata into Büchi.
      + randaut    Generate random automata.
      + autfilt    Filter and convert automata.
      + ltldo      Run LTL/PSL formulas through other tools.

      randaut does not need any presentation: it does what you expect.

      ltlgrind is a new tool that mutates LTL or PSL formulas.  If you
658
      have a tool that is bogus on some formula that is too large to
659
660
661
      debug, you can use ltlgrind to generate smaller derived formulas
      and see if you can reproduce the bug on those.

662
663
664
665
666
667
668
669
670
671
672
673
      autfilt is a new tool that processes a stream of automata.  It
      allows format conversion, filtering automata based on some
      properties, and general transformations (e.g., change of
      acceptance conditions, removal of useless states, product
      between automata, etc.).

      ltldo is a new tool that runs LTL/PSL formulas through other
      tools, but uses Spot's command-line interfaces for specifying
      input and output.  This makes it easier to use third-party tool
      in a pipe, and it also takes care of some necessary format
      conversion.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
674
    - ltl2tgba has a new option, -U, to produce unambiguous automata.
675
676
677
      In unambiguous automata any word is recognized by at most one
      accepting run, but there might be several ways to reject a word.
      This works for LTL and PSL formulas.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
678

679
    - ltl2tgba has a new option, -S, to produce generalized-Büchi
680
681
682
683
684
      automata with state-based acceptance.  Those are obtained by
      converting some transition-based GBA into a state-based GBA, so
      they are usually not as small as one would wish.  The same
      option -S is also supported by autfilt.

685
686
687
688
689
    - ltlcross will work with translator producing automata with any
      acceptance condition, provided the output is in the HOA format.
      So it can effectively be used to validate tools producing Rabin
      or Streett automata.

690
    - ltlcross has several new options:
691

692
693
        --grind attempts to reduce the size of any bogus formula it
        discovers, while still exhibiting the bug.
694

695
696
        --ignore-execution-failures ignores cases where a translator
        exits with a non-zero status.
697
698

	--automata save the produced automata into the CSV or JSON
699
        file.  Those automata are saved using the HOA format.
700
701
702
703
704

      ltlcross will also output two extra columns in its CSV/JSON
      output: "ambiguous_aut" and "complete_aut" are Boolean
      that respectively tells whether the automaton is
      ambiguous and complete.
705

706
    - "ltlfilt --stutter-invariant" will now work with PSL formulas.
707
      The implementation is actually much more efficient
708
      than our previous implementation that was only for LTL.
709

710
711
712
713
714
    - ltlfilt's old -q/--quiet option has been renamed to
      --ignore-errors.  The new -q/--quiet semantic is the
      same as in grep (and also autfilt): disable all normal
      input, for situtations where only the exit status matters.

715
716
717
718
    - ltlfilt's old -n/--negate option can only be used as --negate
      now.  The short '-n NUM' option is now the same as the new
      --max-count=N option, for consistency with other tools.

719
720
721
    - ltlfilt has a new --count option to count the number of matching
      automata.

722
723
724
    - ltlfilt has a new --exclusive-ap option to constrain formulas
      based on a list of mutually exclusive atomic propositions.

725
726
727
728
    - ltlfilt has a new option --define to be used in conjunction with
      --relabel or --relabel-bool to print the mapping between old and
      new labels.

729
730
731
732
733
734
    - all tools that produce formulas or automata now have an --output
      (a.k.a. -o) option to redirect that output to a file instead of
      standard output.  The name of this file can be constructed using
      the same %-escape sequences that are available for --stats or
      --format.

735
736
737
738
    - all tools that output formulas have a -0 option to separate
      formulas with \0.  This helps in conjunction with xargs -0.

    - all tools that output automata have a --check option that
739
740
741
742
743
744
745
746
747
748
      request extra checks to be performed on the output to fill
      in properties values for the HOA format.  This options
      implies -H for HOA output.  For instance
      	ltl2tgba -H 'formula'
      will declare the output automaton as 'stutter-invariant'
      only if the formula is syntactically stutter-invariant
      (e.g., in LTL\X).  With
        ltl2tgba --check 'formula'
      additional checks will be performed, and the automaton
      will be accurately marked as either 'stutter-invariant'
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
749
750
      or 'stutter-sensitive'.  Another check performed by
      --check is testing whether the automaton is unambiguous.
751

752
753
754
755
756
757
    - ltlcross (and ltldo) have a list of hard-coded shorthands
      for some existing tools.  So for instance running
      'ltlcross spin ...' is the same as running
      'ltlcross "spin -f %s>%N" ...'.   This feature is much
      more useful for ltldo.

758
759
    - For options that take an output filename (i.e., ltlcross's
      --save-bogus, --grind, --csv, --json) you can force the file
760
761
      to be opened in append mode (instead of being truncated) by
      by prefixing the filename with ">>".  For instance
762
763
764
      	  --save-bogus=">>bugs.ltl"
      will append to the end of the file.

765
766
  * Other noteworthy news

767
768
769
770
771
772
773
774
    - The web site moved to http://spot.lrde.epita.fr/.

    - We now have Debian packages.
      See http://spot.lrde.epita.fr/install.html

    - The documentation now includes some simple code examples
      for both Python and C++.  (This is still a work in progress.)

775
776
777
778
    - The curstomized version of BuDDy (libbdd) used by Spot has be
      renamed as (libbddx) to avoid issues with copies of BuDDy
      already installed on the system.

779
780
    - There is a parser for the HOA format
      (http://adl.github.io/hoaf/) available as a
781
782
783
784
785
786
      spot::automaton_stream_parser object or spot::parse_aut()
      function.  The former version is able to parse a stream of
      automata in order to do batch processing.  This format can be
      output by all tools (since Spot 1.2.5) using the --hoa option,
      and it can be read by autfilt (by default) and ltlcross (using
      the %H specifier).  The current implementation does not support
787
788
      alternation.  Multiple initial states are converted into an
      extra initial state; complemented acceptance sets Inf(!x) are
789
790
      converted to Inf(x); explicit or implicit labels can be used;
      aliases are supported; "--ABORT--" can be used in a stream.
791

792
793
794
795
796
797
    - The above HOA parser can also parse never claims, and LBTT
      automata, so the never claim parser and the LBTT parser have
      been removed.  This implies that autfilt can input a mix of HOA,
      never claims, and LBTT automata.  ltlcross also use the same
      parser for all these output, and the old %T and %N specifiers
      have been deprecated and replaced by %O (for output).
798

799
800
    - While not all algorithms in the library are able to work with
      any acceptance condition supported by the HOA format, the
801
      following two new functions mitigate that:
802
803
804
805
806
807
808
809
810
811

      - remove_fin() takes a TωA whose accepting condition uses Fin(x)
	primitive, and produces an equivalent TωA without Fin(x):
	i.e., the output acceptance is a disjunction of generalized
	Büchi acceptance.  This type of acceptance is supported by
	SCC-based emptiness-check, for instance.

      - similarly, to_tgba() converts any TωA into an automaton with
	generalized-Büchi acceptance.

812
813
814
    - randomize() is a new algorithm that randomly reorders the states
      and transitions of an automaton.  It can be used from the
      command-line using "autfilt --randomize".
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
815

816
817
    - the interface in iface/dve2 has been renamed to iface/ltsmin
      because it can now interface the dynamic libraries created
818
      either by Divine (as patched by the LTSmin group) or by
819
820
      Spins (the LTSmin compiler for Promela).

821
822
823
824
825
826
827
828
    - LTL/PSL formulas can include /* comments */.

    - PSL SEREs support a new operator [:*i..j], the iterated fusion.
      [:*i..j] is to the fusion operator ':' what [*i..j] is to the
      concatenation operator ';'.  For instance (a*;b)[:*3] is the
      same as (a*;b):(a*;b):(a*;b).  The operator [:+], is syntactic
      sugar for [:*1..], and corresponds to the operator ⊕ introduced
      by Dax et al. (ATVA'09).
829

830
831
832
833
834
835
    - GraphViz output now uses an horizontal layout by default, and
      also use circular states (unless the automaton has more than 100
      states, or uses named-states).  The --dot option of the various
      command-line tools takes an optional parameter to fine-tune the
      GraphViz output (including vertical layout, forced circular or
      elliptic states, named automata, SCC information, ordered
836
837
838
839
      transitions, and different ways to colorize the acceptance
      sets).  The environment variables SPOT_DOTDEFAULT and
      SPOT_DOTEXTRA can also be used to respectively provide a default
      argument to --dot, and add extra attributes to the output graph.
840

841
    - Never claims can now be output in the style used by Spin since
842
843
844
845
846
847
      version 6.2.4 (i.e., using do..od instead of if..fi, and with
      atomic statements for terminal acceptance).  The default output
      is still the old one for compatibility with existing tools.  The
      new style can be requested from command-line tools using option
      --spin=6 (or -s6 for short).

848
    - Support for building unambiguous automata.  ltl_to_tgba() has a
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
849
850
851
852
      new options to produce unambiguous TGBA (used by ltl2tgba -U as
      discussed above).   The function is_unambiguous() will check
      whether an automaton is unambigous, and this is used by
      autfilt --is-unmabiguous.
853

854
855
856
857
858
859
860
861
    - The SAT-based minimization algorithm for deterministic automata
      has been updated to work with ω-Automaton with any acceptance.
      The input and the output acceptance can be different, so for
      instance it is possible to create a minimal deterministic
      Streett automaton starting from a deterministic Rabin automaton.
      This functionnality is available via autfilt's --sat-minimize
      option.  See doc/userdoc/satmin.html for details.

862
863
864
    - The on-line interface at http://spot.lrde.epita.fr/trans.html
      can be used to check stutter-invariance of any LTL/PSL formula.

865
866
867
868
    - The on-line interface will work around atomic propositions not
      supported by ltl3ba.  (E.g. you can now translate F(A) or
      G("foo < bar").)

869
  * Noteworthy code changes
870
871
872

    - Boost is not used anymore.

873
874
875
876
877
878
879
880
881
882
883
884
885
    - Automata are now manipulated exclusively via shared pointers.

    - Most of what was called tgba_something is now called
      twa_something, unless it is really meant to work only for TGBA.
      This includes functions, classes, file, and directory names.
      For instance the class tgba originally defined in tgba/tgba.hh,
      has been replaced by the class twa defined in twa/twa.hh.

    - the tgba_explicit class has been completely replaced by a more
      efficient twa_graph class.  Many of the algorithms that were
      written against the abstract tgba (now twa) interface have been
      rewritten using twa_graph instances as input and output, making
      the code a lot simpler.
886

887
888
889
    - The tgba_succ_iterator (now twa_succ_iterator) interface has
      changed.  Methods next(), and first() should now return a bool
      indicating whether the current iteration is valid.
890

891
892
    - The twa base class has a new method, release_iter(), that can
      be called to give a used iterator back to its automaton.  This
893
894
895
896
      iterator is then stored in a protected member, iter_cache_, and
      all implementations of succ_iter() can be updated to recycle
      iter_cache_ (if available) instead of allocating a new iterator.

897
898
899
    - The tgba (now called twa) base class has a new method, succ(),
      to support C++11' range-based for loop, and hide all the above
      change.
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922

      Instead of the following syntax:

	tgba_succ_iterator* i = aut->succ_iter(s);
	for (i->first(); !i->done(); i->next())
	  {
	     // use i->current_state()
	     //     i->current_condition()
	     //     i->current_acceptance_conditions()
	  }
	delete i;

      We now prefer:

	for (auto i: aut->succ(s))
	  {
	    // use i->current_state()
	    //     i->current_condition()
	    //     i->current_acceptance_conditions()
	  }

      And the above syntax is really just syntactic suggar for

923
	twa_succ_iterator* i = aut->succ_iter(s);
924
925
926
927
928
929
930
931
932
933
934
935
	if (i->first())
	  do
	    {
	      // use i->current_state()
	      //     i->current_condition()
	      //     i->current_acceptance_conditions()
	    }
	  while (i->next());
	aut->release_iter(i); // allow the automaton to recycle the iterator

      Where the virtual calls to done() and delete have been avoided.

936
    - twa::succ_iter() now takes only one argument.  The optional
937
938
939
940
941
942
943
944
945
      global_state and global_automaton arguments have been removed.

    - The following methods have been removed from the TGBA interface and
      all their subclasses:
        - tgba::support_variables()
	- tgba::compute_support_variables()
	- tgba::all_acceptance_conditions()       // use acc().accepting(...)
	- tgba::neg_acceptance_conditions()
	- tgba::number_of_acceptance_conditions() // use acc().num_sets()
946

947
    - Membership to acceptance sets are now stored using bit sets,
948
      currently limited to 32 bits.  Each TωA has a acc() method that
949
950
951
952
      returns a reference to an acceptance object (of type
      spot::acc_cond), able to operate on acceptance marks
      (spot::acc_cond::mark_t).

953
      Instead of writing code like
954
955
956
        i->current_acceptance_conditions() == aut->all_acceptance_conditions()
      we now write
        aut->acc().accepting(i->current_acceptance_conditions())
957
      (Note that for accepting(x) to return something meaningful, x
958
      should be a set of acceptance sets visitied infinitely often.  So let's
959
      imagine that in the above example i is looking at a self-loop.)
960
961
962
963
964
965

      Similarly,
        aut->number_of_acceptance_conditions()
      is now
        aut->acc().num_sets()

966
967
968
969
970
971
972
973
974
975
976
    - All functions used for printing LTL/PSL formulas or automata
      have been renamed to print_something().  Likewise the various
      parsers should be called parse_something() (they haven't yet
      all been renamed).

    - All test suites under src/ have been merged into a single one in
      src/tests/.  The testing tool that was called
      src/tgbatest/ltl2tgba has been renamed as src/tests/ikwiad
      (short for "I Know What I Am Doing") so that users should be
      less tempted to use it instead of src/bin/ltl2tgba.

977
978
  * Removed features

979
    - The long unused interface to GreatSPN (or rather, interface to
980
      a non-public, customized version of GreatSPN) has been removed.
981
      As a consequence, we could get rid of many cruft in the
982
983
      implementation of Couvreur's FM'99 emptiness check.

984
985
986
987
988
989
990
991
992
993
994
    - Support for symbolic, BDD-encoded TGBAs has been removed.  This
      includes the tgba_bdd_concrete class and associated supporting
      classes, as well as the ltl_to_tgba_lacim() LTL translation
      algorithm.  Historically, this TGBA implementation and LTL
      translation were the first to be implemented in Spot (by
      mistake!) and this resulted in many bad design decisions.  In
      practice they were of no use as we only work with explicit
      automata (i.e. not symbolic) in Spot, and those produced by
      these techniques are simply too big.

    - All support for ELTL, i.e., LTL logic extended with operators
995
      represented by automata has been removed.  It was never used in
996
997
998
999
      practice because it had no practical user interface, and the
      translation was a purely-based BDD encoding producing huge
      automata (when viewed explictely), using the above and non
      longuer supported tgba_bdd_concrete class.
1000

1001
    - Our implementation of the Kupferman-Vardi complementation has
1002
      been removed: it was unused in practice beause of the size of
1003
1004
1005
      the automata built, and it did not survive the conversion of
      acceptance sets from BDDs to bitsets.

1006
1007
    - The unused implementation of state-based alternating Büchi
      automata has been removed.
1008

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1009
1010
1011
1012
1013
    - Input and output in the old, Spot-specific, text format for
      TGBA, has been fully removed.  We now use HOA everywhere.  (In
      case you have a file in this format, install Spot 1.2.6 and use
      "src/tgbatest/ltl2tgba -H -X file" to convert the file to HOA.)

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1014
New in spot 1.2.6 (2014-12-06)
1015

1016
1017
1018
  * New features:

    - ltlcross --verbose is a new option to see what is being done
1019

1020
1021
  * Bug fixes:

1022
1023
1024
1025
    - Remove one incorrect simplification rule for PSL discovered
      via checks on random formulaes.  (The bug was very unlikely
      to trigger on non-random formulas, because it requires a SERE
      with an entire subexpression that is unsatisfiable.)
1026
1027
1028
1029
1030
1031
    - When the automaton resulting from the translation of a positive
      formula is deterministic, ltlcross will compute its complement
      to perform additional checks against other translations of the
      positive formula.  The same procedure should be performed with
      automata obtained from negated formulas, but because of a typo
      this was not the case.
1032
1033
    - the neverclaim parser will now diagnose redefinitions of
      state labels.
1034
1035
    - the acceptance specification in the HOA format output have been
      adjusted to match recent changes in the format specifications.
1036
    - atomic propositions are correctly escaped in the HOA output.
1037
1038
1039
1040
    - the build rules for documentation have been made compatible with
      version 8.0 of Org-mode.  (This was only a problem if you build
      from the git repository, or if you want to edit the
      documentation.)
1041
1042
1043
1044
    - recent to changes to libstd++ (as shipped by g++ 4.9.2) have
      demonstrated that the order of transitions output by the
      LTL->TGBA translation used to be dependent on the implementation
      of the STL.  This is now fixed.
1045
1046
1047
1048
1049
    - some developpement version of libstd++ had a bug (PR 63698) in
      the assignment of std::set, and that was triggered in two places
      in Spot.  The workaround (not assigning sets) is actually more
      efficient, so we can consider it as a bug fix, even though
      libstd++ has also been fixed.
1050
1051
    - all parsers would report wrong line numbers while processing
      files with DOS style newlines.
1052
    - add support for SWIG 3.0.
1053

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1054
New in spot 1.2.5 (2014-08-21)
1055

1056
  * New features:
1057
1058
1059

    - The online ltl2tgba translator will automatically attempt to
      parse a formula using LBT's syntax if it cannot parse it using
1060
1061
      the normal infix syntax.  It also has an option to display
      formulas using LBT's syntax.
1062

1063
1064
1065
1066
1067
1068
    - ltl2tgba and dstar2tgba have a new experimental option --hoaf to
      output automata in the Hanoï Omega Automaton Format whose
      current draft is at http://adl.github.io/hoaf/
      The corresponding C++ function is spot::hoaf_reachable() in
      tgbaalgos/hoaf.hh.

1069
1070
    - 'randltl 4' is now a shorthand for 'randltl p0 p1 p2 p3'.

1071
1072
1073
1074
    - ltlcross has a new option --save-bogus=FILENAME to save any
      formula for which a problem (other than timeout) was detected
      during translation or using the resulting automatas.

1075
  * Documentation:
1076
1077
1078
1079

    - The man page for ltl2tgba has some new notes and references
      about TGBA and about monitors.

1080
1081
  * Bug fixes:

1082
1083
1084
1085
    - Fix incorrect simplification of promises in the translation
      of the M operator (you may suffer from the bug even if you do
      not use this operator as some LTL patterns are automatically
      reduced to it).
1086
    - Fix simplification of bounded repetition in SERE formulas.
1087
1088
1089
    - Fix incorrect translation of PSL formulas of the form !{f} where
      f is unsatisifable.  A similar bug was fixed for {f} in Spot
      1.1.4, but for some reason it was not fixed for !{f}.
1090
    - Fix parsing of neverclaims produced by Modella.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1091
1092
1093
    - Fix a memory leak in the little-used conversion from
      transition-based alternating automata to tgba.
    - Fix a harmless uninitialized read in BuDDy.
1094
1095
1096
1097
1098
    - When writing to the terminal, ltlcross used to display each
      formula in bright white, to make them stand out.  It turns out
      this was actually hiding the formulas for people using a
      terminal with white background... This version displays formula
      in bright blue instead.
1099
1100
1101
1102
    - 'randltl -n -1 --seed 0' and 'randltl -n -1 --seed 1' used to
      generate nearly the same list of formulas, shifted by one,
      because the PRNG write reset with an incremented seed between
      each output formula.  The PRNG is now reset only once.
1103

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1104
New in spot 1.2.4 (2014-05-15)
1105

1106
1107
1108
  * New features:

    - "-B -x degen-lskip" can be used to disable level-skipping in the
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1109
1110
      degeralization procedure called by ltl2tgba and dstar2tgba.
      This is mostly meant for running experiments.
1111
1112
1113
1114
1115
1116
    - "-B -x degen-lcache=N" can be used to experiment with different
      type of level caching during degeneralization.

  * Bug fixes:

    - Change the Python bindings to make them compatible with Swig 3.0.
1117
1118
1119
    - "ltl2tgta --ta" could crash in certain conditions due to the
      introduction of a simulation-based reduction after
      degeneralization.
1120
1121
1122
1123
1124
    - Fix four incorrect formula-simplification rules, three were
      related to the factorization of Boolean subformulas in
      operands of the non-length-matching "&" SERE operator, and
      a fourth one could only be enabled by explicitely passing the
      favor_event_univ option to the simplifier (not the default).
1125
1126
    - Fix incorrect translation of the fusion operator (":") in SERE
      such as {xx;1}:yy[*] where the left operand has 1 as tail.
1127

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1128
New in spot 1.2.3 (2014-02-11)
1129

1130
1131
1132
1133
1134
  * New features:

    - The SPOT_SATLOG environment variable can be set to a filename to
      obtain statistics about the different iterations of the
      SAT-based minimization.  For an example, see
1135
      http://spot.lrde.epita.fr/satmin.html
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1136
1137
    - The bench/dtgbasat/ benchmark has been updated to use SPOT_SATLOG
      and record more statistics.
1138
1139
1140
1141
    - The default value for the SPOT_SATSOLVER environment
      variable has been changed to "glucose -verb=0 -model %I >%O".
      This assumes that glucose 3.0 is installed.   For older
      versions of glucose, remove the "-model" option.
1142

1143
1144
1145
  * Bug fixes:

    - More fixes for Python 3 compatibility.
1146
1147
1148
    - Fix calculation of length_boolone(), were 'Xa|b|c' was
      considered as length 6 instead of 4 (because it is 'Xa|(b|a)'
      were (b|a) is Boolean).
1149
1150
1151
1152
    - Fix Clang-3.5 warnings.
    - randltl -S did not honor --boolean-priorities.
    - randltl had trouble generating formulas when all unary, or
      all binary/n-ary operators were disabled.
1153
    - Fix spurious testsuite failure when using Pandas 0.13.
1154
1155
1156
1157
1158
    - Add the time spent in child processes when measuring time
      with the timer class.
    - Fix determinism of the SAT-based minimization encoding.
      (It would sometimes produce different equivalent automata,
      because of a different encoding order.)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1159
1160
    - If the SAT-based minimization is asked for a 10-state automaton
      and returns a 6-state automaton, do not ask for a 9-state
1161
      automaton in the next iteration...
1162
1163
1164
1165
    - Fix some compilation issue with the version of Apple's Clang
      that is installed with MacOS X 10.9.
    - Fix VPATH builds when building from the git repository.
    - Fix UP links in the html documentation for command-line tools.
1166

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1167
New in spot 1.2.2 (2014-01-24)
1168

1169
1170
1171
1172
1173
1174
1175
1176
  * Bug fixes:

    - Fix compilation *and* behavior of bitvectors on 32-bit
      architectures.
    - Fix some compilation errors observed using the antique G++ 4.0.1.
    - Fix compatibility with Python 3 in the test suite.
    - Fix a couple of new clang warnings (like "unused private member").
    - Add some missing #includes that are not included indirectly
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1177
      when the C++ compiler is in C++11 mode.
1178
1179
1180
1181
    - Fix detection of numbers that are too large in the ELTL parser.
    - Fix a memory leak in the ELTL parser, and avoid some unnecessary
      calls to strlen() at the same time.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1182
New in spot 1.2.1 (2013-12-11)
1183

1184
  * New features:
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1185

1186
1187
1188
1189
1190
1191
    - commands for translators specified to ltlcross can now
      be given "short names" to be used in the CSV or JSON output.
      For instance
         ltlcross '{small} ltl2tgba -s --small %f >%N' ...
      will run the command "ltl2tgba -s --small %f >%N", but only
      print "small" in output files.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1192

1193
1194
1195
1196
1197
1198
1199
    - ltlcross' CSV and JSON output now contains two additional
      columns: exit_status and exit_code, used to report failures of
      the translator.  If the translation failed, only the time is
      reported, and the rest of the statistics, which are missing,
      area left empty (in CVS) or null (in JSON).  A new option,
      --omit-missing can be used to remove lines for failed
      translations, and remove these two columns.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1200

1201
1202
1203
    - if ltlcross is used with --products=+5 instead of --products=5
      then the stastics for each of the five products will be output
      separately instead of being averaged.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1204

1205
1206
1207
1208
1209
    - if ltlcross is used with tools that produce deterministic Streett
      or Rabin automata (as specified with %D), then the statistics
      output in CSV or JSON will have some extra columns to report
      the size of these input automata before ltlcross converts them
      into TGBA to perform its regular checks.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1210

1211
1212
1213
1214
    - ltlfilt, ltl2tgba, ltl2tgta, and ltlcross can now read formulas
      from CSV files.  Use option -F FILE/COL to read formulas from
      column COL of FILE.  Use -F FILE/-COL if the first line of
      FILE be ignored.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1215

1216
1217
1218
1219
1220
    - when ltlfilt processes formulas from a CSV file, it will output
      each CSV line whose formula matches the given constraints, with
      the rewriten formula.  The new escape sequence %< (text in
      columns before the formula) and %> (text after) can be used
      with the --format option to alter this output.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1221

1222
1223
    - ltlfile, genltl, randltl, and ltl2tgba have a --csv-escape option
      to help escape formulas in CSV files.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1224

1225
    - Please check
1226
            http://spot.lrde.epita.fr/csv.html
1227
      for some discussion and examples of the last few features.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1228

1229
  * Bug fixes:
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1230

1231
1232
1233
1234
1235
1236
    - ltlcross' CSV output has been changed to be more RFC 4180
      compliant: it no longuer output useless cosmetic spaces, and
      use double-quotes with proper escaping for strings.  The only
      RFC 4180 rule that it does not follow is that it will terminate
      lines with \n instead of \r\n because the latter cause issues
      with a couple of tools.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1237

1238
1239
    - ltlcross failed to report missing input or output escape sequences
      on all but the first configured translator.
1240

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1241
New in spot 1.2 (2013-10-01)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1242

1243
1244
1245
1246
1247
1248
1249
1250
  * Changes to command-line tools:

    - ltlcross has a new option --color to color its output.  It is
      enabled by default when the output is a terminal.

    - ltlcross will give an example of infinite word accepted by the
      two automata when the product between a positive automaton and a
      negative automaton is non-empty.
1251

1252
1253
    - ltlcross can now read the Rabin and Streett automata output by
      ltl2dstar.  This type of output should be specified using '%D':
1254

1255
        ltlcross 'ltl2dstar --ltl2nba=spin:path/to/ltl2tgba@-s %L %D'
1256

1257
      However because Spot only supports Büchi acceptance, these Rabin
1258
      and Streett automata are immediately converted to TGBAs before
1259
1260
      further processing by ltlcross.  This is still interesting to
      search for bugs in translators to Rabin or Streett automata, but
1261
      the statistics (of the resulting TGBAs) might not be very relevant.
1262

1263
1264
1265
1266
1267
1268
    - When ltlcross obtains a deterministic automaton from a
      translator it will now complement this automaton to perform
      additional intersection checks.  This is complementation is done
      only for deterministic automata (because that is cheap) and can
      be disabled with --no-complement.

1269
1270
1271
1272
    - To help with debugging problems detected by ltlcross, the
      environment variables SPOT_TMPDIR and SPOT_TMPKEEP control where
      temporary files are created and if they should be erased.  Read
      the man page of ltlcross for details.
1273

1274
    - There is a new command, named dstar2tgba, that converts a
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
      deterministic Rabin or Streett automaton (expressed in the
      output format of ltl2dstar) into a TGBA, BA or Monitor.

      In the case of Rabin acceptance, the conversi