NEWS 107 KB
Newer Older
1
2
New in spot 1.99.5a (not yet released)

3
4
  Command-line tools:

5
6
7
8
  * 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.
9
10
    A demonstration of this feature via the Python bindings
    can be found at https://spot.lrde.epita.fr/ipynb/decompose.html
11

12
13
14
15
16
17
  * 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.

18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
  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
    do actually check the automaton.  The getters have been renamed
    to avoid confusion, and get the names more in line with HOA.

    - 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()

    The setters have the same name as the getters, except they take a
    Boolean argument.  This argument used to be optionnal (defaulting
    to True), but it no longer is.

40
41
42
43
44
45
46
47
48
49
  * 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".
50

51
52
53
54
  * 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.

55
56
57
58
59
  * 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.

60
61
62
63
64
65
66
  * 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.

67
68
69
70
71
72
  * The sat minimization for DTWA now do a better job at selecting
    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.

73
74
75
76
77
78
79
80
  * Explicit Kripke structure (i.e., stored as explciti graphs) have
    been rewritten above the graph class, using an interface similar
    to the twa class.  The new class is called kripke_graph.  The
    custom Kripke parser and printer have been removed, because we can
    now use print_hoa() with the "k" option to print Kripke structure
    in the HOA format, and furthermore the parse_aut() function now
    has an option to read HOA file and produce them as kripke_graph.

81
82
  * Renamings:
    is_guarantee_automaton() -> is_terminal_automaton()
83
    tgba_run -> twa_run
84
85
    dtgba_sat_synthetize() -> dtwa_sat_synthetize()
    dtgba_sat_synthetize_dichotomy() -> dtwa_sat_synthetize_dichotomy()
86

87
88
  Python:
  * Add bindings for is_unambiguous().
89
  * Better interface for sat_minimize().
90

91
92
  Bug fixes:
  * automaton parser was ignoring the "unambiguous" property.
93
94
  * --dot=Bb should work like --dot=b, allowing us to disable
    a B option set via an environment variable.
95

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
96
New in spot 1.99.5 (2015-11-03)
97

98
99
100
  Command-line tools:

  * autfilt has gained a --complement option.
101
    It currently works only for deterministic automata.
102

103
  * By default, autfilt does not simplify automata (this has not
104
    changed), as if the --low --any options were used.  But now, if
105
106
107
    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
108
    --high is given, then the translation intent defaults to --small
109
110
    (unless specified otherwise).

111
112
113
114
  * 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.

115
116
117
  * ltlgrind FILENAME[/COL] is now the same as
    ltlgrind -F FILENAME[/COL] for consistency with ltlfilt.

118
119
  Library:

120
121
122
123
124
  * 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().
125
126
127
128
129

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

130
131
132
133
134
  * 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
135
    the language, but it speeds up some algorithms like NDFS-based
136
137
    emptiness checks, as discussed in our Spin'15 paper.)

138
139
140
  * 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.

141
  * The way to pass option to the automaton parser has been changed to
142
    make it easier to introduce new options.  One such new option is
143
144
    "trust_hoa": when true (the default) supported properties declared
    in HOA files are trusted even if they cannot be easily be verified.
145
146
147
148
149
    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
150
    input filename (making the output of error messages easier).
151

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
152
  * The following renamings make the code more consistent:
153
154
155
    ltl_simplifier -> tl_simplifier
    tgba_statistics::transitions -> twa_statistics::edges
    tgba_sub_statistics::sub_transitions -> twa_sub_statistics::transitions
156
    tgba_run -> twa_run
157
    reduce_run -> twa_run::reduce
158
159
160
161
    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
162
163
164
165
166
167
    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
168

169
170
  Python:

171
  * The minimum supported Python version is now 3.3.
172
  * Add bindings for complete() and dtwa_complement()
173
174
  * Formulas now have a custom __format__ function.  See
    https://spot.lrde.epita.fr/tut01.html for examples.
175
176
  * The Debian package is now compiled for all Python3 versions
    supported by Debian, not just the default one.
177
  * Automata now have get_name()/set_name() methods.
178
179
180
  * 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().)
181
182
183
184
185
186
187
188
  * 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--.
189

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
190
191
192
193
194
195
  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

196
197
  Bugs fixed:

198
  * Work around some weird exception raised when using the
199
200
201
202
203
    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.
204
  * "randaut -Q0 1" used to segfault.
205
206
  * "ltlgrind -F FILENAME/COL" did not preserve other CSV columns.
  * "ltlgrind --help" did not document FORMAT.
207
  * unabbreviate could easily use forbidden operators.
208
209
  * "autfilt --is-unambiguous" could fail to detect the nonambiguity
    of some automata with empty languages.
210
211
212
  * 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"
213

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
214
New in spot 1.99.4 (2015-10-01)
215

216
217
  New features:

218
219
220
221
  * 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.
222

223
224
225
226
227
228
229
230
231
232
  * 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.

233
234
235
236
237
238
239
240
241
242
  * 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.)

243
244
  Major code changes and reorganization:

245
246
247
  * 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
248
    - LTL/PSL formulas are now represented by lightweight formula
249
250
251
252
      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
253
      used to distinguish between operators.
254
255
256
257
258
259
260
261
    - 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.
262

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
263
264
265
266
267
  * 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.

268
269
270
  * The LTL/PSL parser is now declared in tl/parse.hh (instead of
    ltlparse/public.hh).

271
272
273
274
275
276
277
278
279
280
281
  * 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.
282

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
283
New in spot 1.99.3 (2015-08-26)
284

285
286
287
  * The CGI script for LTL translation offers a HOA download link
    for each generated automaton.

288
  * The html documentation now includes a HTML copies of the man
289
    pages, and HTML copies of the Python notebooks.
290

291
292
293
294
  * scc_filter(aut, true) does not remove Fin marks from rejecting
    SCCs, but it now does remove Fin marks from transitions between
    SCCs.

295
296
297
  * All the unabbreviation functions (unabbreviate_ltl(),
    unabbreviate_logic(), unabbreviate_wm()) have been merged into a
    single unabbreviate() function that takes a string representing
298
299
300
    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.
301

302
303
304
305
  * 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.)

306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
  * 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
329
      converting them to Büchi.
330
331
    - 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
332
      automata.  This implies a few minor semantic changes, for
333
      instance --stats=%A used to output the number of acceptance
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
334
      *pairs* in the input automaton, while it now outputs the
335
336
      number of acceptance sets like in all the other tools.

337
338
  * Bugs fixed
    - Some acceptance conditions like Fin(0)|Fin(1)|Fin(2)&Inf(3)
339
      were not detected as generalized-Rabin.
340
341
    - 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
342
    - The CGI script for LTL translation now forces transition-based
343
344
345
346
      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
347
348
    - 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
349
350
      slightly wrong.  For instance ^ was incorrectly escaped, and
      the double quotes where not always properly rendered.
351
352
    - A spurious assertion was triggered by streett_to_generalized_buchi(),
      but only when compiled in DEBUG mode.
353
    - LTL formula rewritten in Spin's syntax no longer have their ->
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
354
      and <-> rewritten away.
355
    - Fix some warnings reported by the development version of GCC 6.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
356
    - The spot.translate() function of the Python binding had a typo
357
      preventing the use of 'low'/'medium'/'high' as argument.
358
    - Fix spurious failure of uniq.test under different locales.
359
360
    - ltlcross now recovers from out-of-memory errors during
      state-space products.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
361
362
    - bitvect.test was failing on 32bit architectures with
      assertions enabled because of a bug in the test case.
363

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
364
New in spot 1.99.2 (2015-07-18)
365

366
  * The scc_info object, used to build a map of SCCs while gathering
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
367
    additional information, has been simplified and speed up.  One
368
    test case where ltlcross would take more than 13min (to check the
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
369
    translation of one PSL formula) now takes only 75s.
370

371
372
373
  * 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
374
    remove_fin() functions when the input automaton is a Streett
375
376
377
378
379
380
381
382
383
    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
384
385
386
387
    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.
388

389
  * Bugs fixed:
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
390
    - p[+][:*2] was not detected as belonging to siPSL.
391
392
    - scc_filter() would incorrectly remove Fin marks from
      rejecting SCCs.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
393
    - the libspotltsmin library is installed.
394
    - ltlcross and ltldo did not properly quote atomic propositions
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
395
396
      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
397
398
399
400
      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.
401

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
402
New in spot 1.99.1 (2015-06-23)
403

404
405
406
407
408
  * 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
409
      Automata) while this version now deals with what we call TωA
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
      (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.

429
    - As a consequence of the switches to C++11 and to TωA, a lot of
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
      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
463
      have a tool that is bogus on some formula that is too large to
464
465
466
      debug, you can use ltlgrind to generate smaller derived formulas
      and see if you can reproduce the bug on those.

467
468
469
470
471
472
473
474
475
476
477
478
      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
479
    - ltl2tgba has a new option, -U, to produce unambiguous automata.
480
481
482
      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
483

484
    - ltl2tgba has a new option, -S, to produce generalized-Büchi
485
486
487
488
489
      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.

490
491
492
493
494
    - 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.

495
    - ltlcross has several new options:
496

497
498
        --grind attempts to reduce the size of any bogus formula it
        discovers, while still exhibiting the bug.
499

500
501
        --ignore-execution-failures ignores cases where a translator
        exits with a non-zero status.
502
503

	--automata save the produced automata into the CSV or JSON
504
        file.  Those automata are saved using the HOA format.
505
506
507
508
509

      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.
510

511
    - "ltlfilt --stutter-invariant" will now work with PSL formulas.
512
      The implementation is actually much more efficient
513
      than our previous implementation that was only for LTL.
514

515
516
517
518
519
    - 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.

520
521
522
523
    - 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.

524
525
526
    - ltlfilt has a new --count option to count the number of matching
      automata.

527
528
529
    - ltlfilt has a new --exclusive-ap option to constrain formulas
      based on a list of mutually exclusive atomic propositions.

530
531
532
533
    - 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.

534
535
536
537
538
539
    - 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.

540
541
542
543
    - 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
544
545
546
547
548
549
550
551
552
553
      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
554
555
      or 'stutter-sensitive'.  Another check performed by
      --check is testing whether the automaton is unambiguous.
556

557
558
559
560
561
562
    - 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.

563
564
    - For options that take an output filename (i.e., ltlcross's
      --save-bogus, --grind, --csv, --json) you can force the file
565
566
      to be opened in append mode (instead of being truncated) by
      by prefixing the filename with ">>".  For instance
567
568
569
      	  --save-bogus=">>bugs.ltl"
      will append to the end of the file.

570
571
  * Other noteworthy news

572
573
574
575
576
577
578
579
    - 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.)

580
581
582
583
    - 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.

584
585
    - There is a parser for the HOA format
      (http://adl.github.io/hoaf/) available as a
586
587
588
589
590
591
      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
592
593
      alternation.  Multiple initial states are converted into an
      extra initial state; complemented acceptance sets Inf(!x) are
594
595
      converted to Inf(x); explicit or implicit labels can be used;
      aliases are supported; "--ABORT--" can be used in a stream.
596

597
598
599
600
601
602
    - 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).
603

604
605
    - While not all algorithms in the library are able to work with
      any acceptance condition supported by the HOA format, the
606
      following two new functions mitigate that:
607
608
609
610
611
612
613
614
615
616

      - 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.

617
618
619
    - 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
620

621
622
    - the interface in iface/dve2 has been renamed to iface/ltsmin
      because it can now interface the dynamic libraries created
623
      either by Divine (as patched by the LTSmin group) or by
624
625
      Spins (the LTSmin compiler for Promela).

626
627
628
629
630
631
632
633
    - 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).
634

635
636
637
638
639
640
    - 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
641
642
643
644
      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.
645

646
    - Never claims can now be output in the style used by Spin since
647
648
649
650
651
652
      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).

653
    - Support for building unambiguous automata.  ltl_to_tgba() has a
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
654
655
656
657
      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.
658

659
660
661
662
663
664
665
666
    - 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.

667
668
669
    - The on-line interface at http://spot.lrde.epita.fr/trans.html
      can be used to check stutter-invariance of any LTL/PSL formula.

670
671
672
673
    - 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").)

674
  * Noteworthy code changes
675
676
677

    - Boost is not used anymore.

678
679
680
681
682
683
684
685
686
687
688
689
690
    - 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.
691

692
693
694
    - 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.
695

696
697
    - The twa base class has a new method, release_iter(), that can
      be called to give a used iterator back to its automaton.  This
698
699
700
701
      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.

702
703
704
    - 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.
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727

      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

728
	twa_succ_iterator* i = aut->succ_iter(s);
729
730
731
732
733
734
735
736
737
738
739
740
	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.

741
    - twa::succ_iter() now takes only one argument.  The optional
742
743
744
745
746
747
748
749
750
      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()
751

752
    - Membership to acceptance sets are now stored using bit sets,
753
      currently limited to 32 bits.  Each TωA has a acc() method that
754
755
756
757
      returns a reference to an acceptance object (of type
      spot::acc_cond), able to operate on acceptance marks
      (spot::acc_cond::mark_t).

758
      Instead of writing code like
759
760
761
        i->current_acceptance_conditions() == aut->all_acceptance_conditions()
      we now write
        aut->acc().accepting(i->current_acceptance_conditions())
762
      (Note that for accepting(x) to return something meaningful, x
763
      should be a set of acceptance sets visitied infinitely often.  So let's
764
      imagine that in the above example i is looking at a self-loop.)
765
766
767
768
769
770

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

771
772
773
774
775
776
777
778
779
780
781
    - 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.

782
783
  * Removed features

784
    - The long unused interface to GreatSPN (or rather, interface to
785
      a non-public, customized version of GreatSPN) has been removed.
786
      As a consequence, we could get rid of many cruft in the
787
788
      implementation of Couvreur's FM'99 emptiness check.

789
790
791
792
793
794
795
796
797
798
799
    - 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
800
      represented by automata has been removed.  It was never used in
801
802
803
804
      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.
805

806
    - Our implementation of the Kupferman-Vardi complementation has
807
      been removed: it was unused in practice beause of the size of
808
809
810
      the automata built, and it did not survive the conversion of
      acceptance sets from BDDs to bitsets.

811
812
    - The unused implementation of state-based alternating Büchi
      automata has been removed.
813

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
814
815
816
817
818
    - 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
819
New in spot 1.2.6 (2014-12-06)
820

821
822
823
  * New features:

    - ltlcross --verbose is a new option to see what is being done
824

825
826
  * Bug fixes:

827
828
829
830
    - 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.)
831
832
833
834
835
836
    - 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.
837
838
    - the neverclaim parser will now diagnose redefinitions of
      state labels.
839
840
    - the acceptance specification in the HOA format output have been
      adjusted to match recent changes in the format specifications.
841
    - atomic propositions are correctly escaped in the HOA output.
842
843
844
845
    - 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.)
846
847
848
849
    - 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.
850
851
852
853
854
    - 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.
855
856
    - all parsers would report wrong line numbers while processing
      files with DOS style newlines.
857
    - add support for SWIG 3.0.
858

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
859
New in spot 1.2.5 (2014-08-21)
860

861
  * New features:
862
863
864

    - The online ltl2tgba translator will automatically attempt to
      parse a formula using LBT's syntax if it cannot parse it using
865
866
      the normal infix syntax.  It also has an option to display
      formulas using LBT's syntax.
867

868
869
870
871
872
873
    - 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.

874
875
    - 'randltl 4' is now a shorthand for 'randltl p0 p1 p2 p3'.

876
877
878
879
    - 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.

880
  * Documentation:
881
882
883
884

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

885
886
  * Bug fixes:

887
888
889
890
    - 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).
891
    - Fix simplification of bounded repetition in SERE formulas.
892
893
894
    - 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}.
895
    - Fix parsing of neverclaims produced by Modella.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
896
897
898
    - Fix a memory leak in the little-used conversion from
      transition-based alternating automata to tgba.
    - Fix a harmless uninitialized read in BuDDy.
899
900
901
902
903
    - 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.
904
905
906
907
    - '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.
908

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
909
New in spot 1.2.4 (2014-05-15)
910

911
912
913
  * New features:

    - "-B -x degen-lskip" can be used to disable level-skipping in the
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
914
915
      degeralization procedure called by ltl2tgba and dstar2tgba.
      This is mostly meant for running experiments.
916
917
918
919
920
921
    - "-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.
922
923
924
    - "ltl2tgta --ta" could crash in certain conditions due to the
      introduction of a simulation-based reduction after
      degeneralization.
925
926
927
928
929
    - 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).
930
931
    - Fix incorrect translation of the fusion operator (":") in SERE
      such as {xx;1}:yy[*] where the left operand has 1 as tail.
932

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
933
New in spot 1.2.3 (2014-02-11)
934

935
936
937
938
939
  * 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
940
      http://spot.lrde.epita.fr/satmin.html
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
941
942
    - The bench/dtgbasat/ benchmark has been updated to use SPOT_SATLOG
      and record more statistics.
943
944
945
946
    - 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.
947

948
949
950
  * Bug fixes:

    - More fixes for Python 3 compatibility.
951
952
953
    - 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).
954
955
956
957
    - 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.
958
    - Fix spurious testsuite failure when using Pandas 0.13.
959
960
961
962
963
    - 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
964
965
    - 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
966
      automaton in the next iteration...
967
968
969
970
    - 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.
971

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
972
New in spot 1.2.2 (2014-01-24)
973

974
975
976
977
978
979
980
981
  * 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
982
      when the C++ compiler is in C++11 mode.
983
984
985
986
    - 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
987
New in spot 1.2.1 (2013-12-11)
988

989
  * New features:
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
990

991
992
993
994
995
996
    - 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
997

998
999
1000
1001
1002
1003
1004
    - 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
1005

1006
1007
1008
    - 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
1009

1010
1011
1012
1013
1014
    - 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
1015

1016
1017
1018
1019
    - 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
1020

1021
1022
1023
1024
1025
    - 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
1026

1027
1028
    - 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
1029

1030
    - Please check
1031
            http://spot.lrde.epita.fr/csv.html
1032
      for some discussion and examples of the last few features.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1033

1034
  * Bug fixes:
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1035

1036
1037
1038
1039
1040
1041
    - 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
1042

1043
1044
    - ltlcross failed to report missing input or output escape sequences
      on all but the first configured translator.
1045

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1046
New in spot 1.2 (2013-10-01)
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1047

1048
1049
1050
1051
1052
1053
1054
1055
  * 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.
1056

1057
1058
    - ltlcross can now read the Rabin and Streett automata output by
      ltl2dstar.  This type of output should be specified using '%D':
1059

1060
        ltlcross 'ltl2dstar --ltl2nba=spin:path/to/ltl2tgba@-s %L %D'
1061

1062
      However because Spot only supports Büchi acceptance, these Rabin
1063
      and Streett automata are immediately converted to TGBAs before
1064
1065
      further processing by ltlcross.  This is still interesting to
      search for bugs in translators to Rabin or Streett automata, but
1066
      the statistics (of the resulting TGBAs) might not be very relevant.
1067

1068
1069
1070
1071
1072
1073
    - 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.

1074
1075
1076
1077
    - 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.
1078

1079
    - There is a new command, named dstar2tgba, that converts a
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
      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 conversion will output a
      deterministic Büchi automaton if one such automaton exist.  Even
      if no such automaton exists, the conversion will actually
      preserves the determinism of any SCC that can be kept
      deterministic.

      In the case of Streett acceptance, the conversion produces
      non-deterministic Büchi automata with Generalized acceptance.
      These are then degeneralized if requested.
1092

1093
      See http://spot.lrde.epita.fr/dstar2tgba.html for some
1094
1095
      examples, and the man page for more reference.

1096
1097
1098
1099
1100
    - The %S escape sequence used by ltl2tgba --stats to display the
      number of SCCs in the output automaton has been renamed to %c.
      This makes it more homogeneous with the --stats option of the
      new dstar2tgba command.

1101
      Additionally, the %p escape can now be used to show whether the
1102
1103
1104
      output automaton is complete, and the %r escape will give the
      number of seconds spent building the output automaton (excluding
      the time spent parsing the input).
1105

1106
1107
1108
1109
1110
    - ltl2tgba, ltl2tgta, and dstar2tgba have a --complete option
      to output complete automata.

    - ltl2tgba, ltl2tgta, and dstar2tgba can use a SAT-solver to
      minimize deterministic automata.  Doing so is only needed on
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1111
1112
      properties that are stronger than obligations (for obligations
      our WDBA-minimization procedure will return a minimimal
1113
1114
1115
      deterministic automaton more efficiently) and is disabled by
      default.  See the spot-x(7) man page for documentation about the
      related options: sat-minimize, sat-states, sat-acc, state-based.
1116
      See also http://spot.lrde.epita.fr/satmin.html for some
1117
      examples.
1118

1119
1120
1121
1122
    - ltlfilt, genltl, and randltl now have a --latex option to output
      formulas in a way that its easier to embed in a LaTeX document.
      Each operator is output as a command such as \U, \F, etc.
      doc/tl/spotltl.sty gives one possible definition for each macro.
1123

1124
1125
1126
1127
    - ltlfilt, genltl, and randltl have a new --format option to
      indicate how to present the output formula, possibly with
      information about the input.

1128
1129
1130
1131
1132
    - ltlfilt as a new option, --relabel-bool, to abstract independent
      Boolean subformulae as if they were atomic propositions.
      For instance "a & GF(c | d) & b & X(c | d)" would be rewritten
      as "p0 & GF(p1) & Xp1".

1133
  * New functions and classes in the library:
1134

1135
1136
    - dtba_sat_synthetize(): Use a SAT-solver to build an equivalent
      deterministic TBA with a fixed number of states.
1137

1138
1139
    - dtba_sat_minimize(), dtba_sat_minimize_dichotomy(): Iterate
      dtba_sat_synthetize() to reduce the number of states of a TBA.
1140

1141
1142
    - dtgba_sat_synthetize(), dtgba_sat_minimize(),
      dtgba_sat_minimize_dichotomy(): Likewise, for deterministic TGBA.
1143

1144
    - is_complete(): Check whether a TGBA is complete.
1145

1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
    - tgba_complete(): Complete an automaton by adding a sink state
      if needed.

    - dtgba_complement(): Complement a deterministic TGBA.

    - satsolver(): Run an (external) SAT solver, honoring the
      SPOT_SATSOLVER environment variable if set.

    - tba_determinize(): Run a power-set construction, and attempt
      to fix the acceptance simulation to build a deterministic TBA.

    - dstar_parse(): Read a Streett or Rabin automaton in
      ltl2dstar's format.  Note that this format allows only
      deterministic automata.

    - nra_to_nba(): Convert a (possibly non-deterministic) Rabin
      automaton to a non-deterministic Büchi automaton.

    - dra_to_ba(): Convert a deterministic Rabin automaton to a Büchi
      automaton, preserving acceptance in all SCCs where this is possible.

    - nsa_to_tgba(): Convert a (possibly non-deterministic) Streett
      automaton to a non-deterministic TGBA.

    - dstar_to_tgba(): Convert any automaton returned by dstar_parse()
      into a TGBA.

    - build_tgba_mask_keep(): Build a masked TGBA that shows only
      a subset of states of another TGBA.

    - build_tgba_mask_ignore(): Build a masked TGBA that ignore
      a subset of states of another TGBA.

    - class tgba_proxy: Helps writing on-the-fly algorithms that
      delegate most of their methods to the original automaton.

    - class bitvect: A dynamic bit vector implementation.

    - class word: An infinite word, stored as prefix + cycle, with a
      simplify() methods to simplify cycle and prefix in obvious ways.

    - class temporary_file: A temporary file.  Can be instanciated with
      create_tmp_file() or create_open_tmpfile().

    - count_state(): Return the number of states of a TGBA.  Implement
      a couple of specializations for classes where is can be know
      without exploration.

1194
1195
    - to_latex_string(): Output a formula using LaTeX syntax.

1196
1197
1198
    - relabel_bse(): Relabeling of Boolean Sub-Expressions.
      Implements ltlfilt's --relabel-bool option describe above.

1199
1200
1201
1202
1203
  * Noteworthy internal changes:

    - When minimize_obligation() is not given the formula associated
      to the input automaton, but that automaton is deterministic, it
      can still attempt to call minimize_wdba() and check the correcteness
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1204
1205
      using dtgba_complement().  This allows dstar2tgba to apply
      WDBA-minimization on deterministic Rabin automata.
1206
1207
1208

    - tgba_reachable_iterator_depth_first has been redesigned to
      effectively perform a DFS.  As a consequence, it does not
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1209
      inherit from tgba_reachable_iterator anymore.
1210

1211
1212
1213
1214
    - postproc::set_pref() was used to accept an argument among Any,
      Small or Deterministic.  These can now be combined with Complete
      as Any|Complete, Small|Complete, or Deterministic|Complete.

1215
1216
1217
1218
1219
    - operands of n-ary operators (like & and |) are now ordered so
      that Boolean terms come first.  This speeds up syntactic
      implication checks slightly.  Also, literals are now sorted
      using strverscmp(), so that p5 comes before p12.

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1220
1221
1222
1223
    - Syntactic implication checks have been generalized slightly
      (for instance 'a & b & F(a & b)' is now reduced to 'a & b'
      while it was not changed in previous versions).

1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
    - All the parsers implemented in Spot now use the same type to
      store locations.

    - Cleanup of exported symbols

      All symbols in the library now have hidden visibility on ELF systems.
      Public classes and functions have been marked explicitely for export
      with the SPOT_API macro.

      During this massive update, some of functions that should not have
      been made public in the first place have been moved away so that
      they can only be used from the library.  Some old of unused
      functions have been removed.

      removed:
	- class loopless_modular_mixed_radix_gray_code

      hidden:
	- class acc_compl
	- class acceptance_convertor
	- class bdd_allocator
	- class free_list

  * Bug fixes:

    - Degeneralization was not indempotant on automata with an
      accepting initial state that was on a cycle, but without
      self-loop.

    - Configuring with --enable-optimization would reset the value of
      CXXFLAGS.
1255

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1256

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1257
New in spot 1.1.4 (2013-07-29)
1258

1259
1260
1261
1262
1263
  * Bug fixes:
    - The parser for neverclaim, updated in 1.1.3, would fail to
      parse guards of the form (a) || (b) output by ltl2ba or
      ltl3ba, and would only understand ((a) || (b)).
    - When used from ltlcross, the same parser would fail to
1264
1265
      parse further neverclaims after the first failure.
    - Add a missing newline in some error message of ltlcross.
1266
1267
1268
1269
1270
1271
1272
    - Expressions like {SERE} were wrongly translated and simplified
      for SEREs that accept the empty word: they were wrongly reduced
      to true.  Simplification and translation rules have been fixed,
      and the doc/tl/tl.pdf specifications have been updated to better
      explain that {SERE} has the semantics of a closure operator that
      is not exactly what one could expect after reading the PSL
      standard.
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1273
    - Various typos.
1274

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1275
New in spot 1.1.3 (2013-07-09)
1276

1277
1278
1279
1280
1281
1282
1283
1284
  * New feature:
    - The neverclaim parser now understands the new style of output
      used by Spin 6.24 and later.
  * Bug fixes:
    - The scc_filter() function could abort with a BDD error.  If all
      the acceptance sets of an SCC but the first one were useless.
    - The script in bench/spin13/ would not work on MacOS X because
      of some non-portable command.
1285
    - A memory corruption in ltlcross.
1286

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1287
New in spot 1.1.2 (2013-06-09)
1288

1289
1290
1291
1292
1293
  * Bug fixes:
    - Uninitialized variables in ltlcross (affect the count of terminal
      weak, and strong SCCs).
    - Workaround an old GCC bug to allow compilation with g++ <= 4.5
    - Fix several Doxygen comments so that they display correctly.
1294

Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1295
New in spot 1.1.1 (2013-05-13):
1296

1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
  * New features:

    - lbtt_reachable(), the function that outputs a TGBA in LBTT's
      format, has a new option to indicate that the TGBA being printed
      is in fact a Büchi automaton.  In this case it outputs an LBTT
      automaton with state-based acceptance.

      The output of the guards has also been changed in two ways:
      1. atomic propositions that do not match p[0-9]+ are always
         double-quoted.  This avoids issues where t or f were used as
         atomic propositions in the formula, output as-is in the
         automaton, and read back as true or false.  Other names that
         correspond to LBT operators would cause problem as well.
      2. formulas that label transitions are now output as
         irredundant-sums-of-products.

    - 'ltl2tgba --ba --lbtt' will now output automata with state-based
      acceptance.  You can use 'ltl2tgba --ba --lbtt=t' to force the
      output of transition-based acceptance like in the previous
      versions.

      Some illustrations of this point and the previous one can be
      found in the man page for ltl2tgba(1).

1321
1322
1323
1324
1325
1326
    - There is a new function scc_filter_states() that removes all
      useless states from a TGBA.  It is actually an abbridged version
      of scc_filter() that does not alter the acceptance conditions of
      the automaton.  scc_filter_state() should be used when
      post-processing TGBAs that actually represent BAs.

1327
1328
1329
1330
1331
1332
1333
1334
1335
    - simulation_sba(), cosimulation_sba(), and
      iterated_simulations_sba() are new functions that apply to TGBAs
      that actually represent BAs.  They preserve the imporant
      property that if a state of the BA is is accepting, the outgoing
      transitions of that state are all accepting in the TGBA that
      represent the BA.  This is something that was not preserved by
      functions cosimultion() and iterated_simulations() as mentionned
      in the bug fixes below.

1336
1337
1338
    - ltlcross has a new option --seed, that makes it possible to
      change the seed used by the random graph generator.

1339
1340
1341
1342
1343
1344
1345
1346
    - ltlcross has a new option --products=N to check the result of
      each translation against N different state spaces, and everage
      the statistics of these N products.  N default to 1; larger
      values increase the chances to detect inconsistencies in the
      translations, and also make the average size of the product
      built against the translated automata a more pertinent
      statistic.

1347
1348
1349
1350
    - bdd_dict::unregister_all_typed_variables() is a new function,
      making it easy to unregister all BDD variables of a given type
      owned by some object.

1351
  * Bug fixes:
Alexandre Duret-Lutz's avatar
Alexandre Duret-Lutz committed
1352
1353

    - genltl --gh-r generated the wrong formulas due to a typo.