• Alexandre Duret-Lutz's avatar
    Introduce rational operators and trivial simplification rules. · 546559b8
    Alexandre Duret-Lutz authored
    Trivial simplifications rules (such as "FFa=Fa" or "x&1=x")
    are performed any time a formule is instanciated.
    
    * src/ltlast/constant.hh, src/ltlast/constant.cc
    (true_instance, true_instance_): Declare the true_instance_ as a
    static member, and move true_instance() into the .hh so it gets
    inlined.  Have true_instance_ as a class variable will ensure that
    it is the first formula instantiated.  Binop simplifications rely
    on this to order arguments.
    (false_instance, false_instance_): Likewise.
    (empty_word_instance, empty_word_instance_): New method and static
    member.
    * src/ltlast/formula.hh (formula::formula): If max_count_ ever
    loops, skip the first three values so that constants always have
    smaller hash codes.
    * src/ltlast/binop.hh, src/ltlast/binop.cc (instance): Add
    simplifications and document them.
    * src/ltlast/multop.hh (multop::Concat): New operator.
    * src/ltlast/multop.cc (op_name): Handle Concat.
    (instance): Inline Concat arguments without reordering.  Handle
    absorbent and neutral elements for all operators.
    * src/ltlast/unop.hh (unop::Star): New operator.
    * src/ltlast/unop.cc (op_name): Handle Star.
    (instance): Handle Star, and add trivial simplifications for
    other unary operators.
    * src/ltlparse/ltlparse.yy (OP_CONCAT, OP_STAR, CONST_EMPTYWORD):
    Declare these new operators and add rules for them.
    * src/ltlparse/ltlscan.ll (OP_CONCAT, OP_STAR, CONST_EMPTYWORD):
    Output these new operators.
    * src/ltltest/equals.test: New tests.
    * src/ltltest/parse.test: Remove redundant test.
    * src/ltltest/tunabbrev.test, src/tgbatest/emptchk.test: Adjust tests.
    * src/ltlvisit/basicreduce.cc, src/ltlvisit/contain.cc,
    src/ltlvisit/nenoform.cc, src/ltlvisit/reduce.cc,
    src/ltlvisit/syntimpl.cc, src/ltlvisit/tostring.cc,
    src/ltlvisit/tunabbrev.cc: Complete visitors to handle new
    operators.
    * src/ltltest/nenoform.test: More tests.
    * src/ltlvisit/lunabbrev.cc (unabbreviate_logic_visitor::visit):
    Clone formulae before instance() function actually have a chance
    to destroy them.
    * src/tgba/formula2bdd.cc, src/tgbaalgos/eltl2tgba_lacim.cc,
    src/tgbaalgos/ltl2taa.cc, src/tgbaalgos/ltl2tgba_fm.cc,
    src/tgbaalgos/ltl2tgba_lacim.cc: Adjust switches to assert on new
    operators.
    546559b8