* src/ltlast/binop.cc (binop::binop): Fix computation
of syntactic guarantee and syntactic obligation for the Implies
operator. Reported by Étienne Renault.
* src/ltltest/kind.test: Add more tests.
The actual rules are a bit more complex:
a & X(G(a&b...)&c...) = Ga & X(G(b...)&c...)
a | X(Fa | c) = F(a) | c
with the second rule being applied only if all XF can
be removed. See the documentation for an example.
* src/ltlvisit/simplify.cc: Implement these new rules.
* doc/tl/tl.tex: Document them.
* src/ltltest/reduccmp.test: Add test cases.
* src/ltlvisit/simplify.cc: Implement them here, and augment them
to support M, and W operators.
* src/ltltest/reduccmp.test: Add some tests.
* doc/tl/tl.tex (Simplifications Based on Implications): Document
these rules.
* doc/tl/tl.bib (babiak.12.tacas): New entry.
* src/ltlvisit/length.hh (length_boolone): New function.
* src/ltlvisit/length.cc (length_boolone): Implement it using...
(length_boolone_visitor): ... this new visitor.
* src/ltltest/randltl.cc: Use length_boolone() to check the result
of the random generator, and ignore any formula larger (in
length()) than opt_f. This fix a bug where the random formula
generator would sometime produce formula larger than requested,
because of the trivial rewriting of {f}[]->e as e|!f.
* src/ltltest/length.cc: Add option -b to call length_boolone().
* src/ltltest/length.test: Test length_boolone().
* src/ltlparse/ltlparse.yy: Cleanup the names used in the grammar.
* src/ltlparse/public.hh (parse_ratexp): Rename as...
(parse_sere): ... this.
* src/ltltest/consterm.cc: Adjust call to parse_ratexp().
* doc/tl/tl.tex: Replace all occurrences of ``rational
[expression]'' by SERE. Add a couple of more notes and
bibliographic references.
* doc/tl/tl.bib: More entries.
* src/ltlvisit/simplify.cc (simplify_visitor): Do it.
* src/ltltest/reduccmp.test: Add a test.
* doc/tl/tl.tex: Document it.
* src/ltlast/multop.cc: Fix the computation of is.accepting_eword
for Fusion. The Fusion operator never accepts [*0].
* doc/tl/Makefile.am: Rewrite using latexmk instead of texi2dvi.
Also define the SpotVersion when calling latexmk, not in tl.tex.
* doc/tl/tl.tex: Assume SpotVersion is defined outside the file.
* src/ltlvisit/mark.hh, src/ltlvisit/mark.cc (mark_concat_ops,
simplify_mark): Rewrite these two functions as methods of
(mark_tools): this new class.
* src/ltlast/binop.cc, src/ltlast/unop.cc: Adjust computation
of not_marked to ignore marked operators that are not at
the top-level. I.e., something like X(!{a}) is not marked.
* src/tgbaalgos/ltl2tgba_fm.cc (translate_dict::mt): New
instance of mark_tools.
(formula_canonizer::translate) Adjust calls to
mark_concat_ops() and simplify_mark().
* src/tgbaalgos/ltl2tgba_fm.cc (ratexp_to_dfa::translate): Do not
translate a subformula if we have already proved it useless in
a previous rational expression.
* src/tgbatest/ltl2tgba.test: Add an example, although that
test does not ensure the subformula is ignored early in the
translation. I.e., it would still work without the patch.
* src/tgbaalgos/ltl2tgba_fm.cc (ratexp_to_dfa::translate,
ltl_to_tgba_fm): Do not convert labels as Boolean formulas before
creating transitions. Use the bdd directly, and register the used
transitions later.
We used to cache it only for formulas used as states.
* src/tgbaalgos/ltl2tgba_fm.cc (translate_dict::ltl_to_bdd): New method.
(ltl_trad_visitor::recurse): Use ltl_to_bdd().
(formula_canonizer): Likewise.
(ltl_to_tgba_fm): Adjust.
This fixes a bug where {(a&!a)[=2]} was translated either into an
universal automaton (with simplification turned off) or in an
empty automaton (with simplification turned on).
* src/tgbaalgos/ltl2tgba_fm.cc (ratexp_to_dfa::translate): Trim
the automaton.
(ratexp_to_dfa::succ, ratexp_to_dfa::get_label): Deal with trimed
states.
(ltl_trad_visitor::visit(unop::Closure)): Likewise.
* src/tgbatest/ltl2tgba.test, src/ltltest/reduccmp.test: New test
cases.
This is especially important when translating the Closure
operators, because normally we should only keep the satisfiable
formulae (i.e. co-accessible states), which seems hard to check on
the fly. After this patch we need to teach
ratexp_to_dfa::translate() how to trim (and then minimize) the DFA
to prune those useless (non co-accessible) states.
* src/tgbaalgos/ltl2tgba_fm.cc (ratexp_to_dfa): New class.
(translate_dict::transdfa): New member.
(ltl_trad_visitor::visit(unop::Closure)): Use transdfa.
* src/ltlvisit/simplify.cc (syntactic_implication_aux): Refine
rules to deal with pure eventualities and purely universal
properties.
* src/ltltest/reduccmp.test: Add tests.
* src/ltlvisit/simplify.hh, src/ltlvisit/simplify.cc
(ltl_simplifier::ltl_simplifier, ltl_simplifier::get_dict): Make
it possible to supply and retrieve the dictionary used.
(ltl_simplifier::as_bdd): New function, exported from the cache.
* src/tgbaalgos/ltl2tgba_fm.cc (translate_dict): Store the
ltl_simplifier object.
(translate_dict::boolean_to_bdd): Call ltl_simplifier::as_bdd.
(translate_ratexp): New wrapper around the ratexp_trad_visitor,
calling boolean_to_bdd whenever possible.
(ratexp_trad_visitor): Do not deal with negated formulae, there
are necessarily Boolean and handled by translate_ratexp().
(ltl_visitor): Adjust to call translate_ratexp.
(ltl_to_tgba_fm): Adjust passing of the ltl_simplifier to the
translate_dict, and make sure everybody is using the same
dictionary.
* src/tgbatest/ltl2tgba.cc: Pass the dictionary to the
ltl_simplifier.
* src/ltlvisit/contain.cc
(language_containment_checker::contained,
language_containment_checker::neg_contained,
language_containment_checker::contained_neg): Detect
cases where both formulae are equal.
