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Rewrite F(a M b) as F(a & b), and G(a W b) as G(a | b).

Browse source 
* src/ltlvisit/simplify.cc: Implement these rules.
* src/ltltest/reduccmp.test: Add tests.
* doc/tl/tl.tex: Document them.
This commit is contained in:
Alexandre Duret-Lutz 2012-01-11 11:15:54 +01:00
parent 212c7ebdd7
commit 54d4a0a093
3 changed files with 65 additions and 16 deletions
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63
src/ltlvisit/simplify.cc
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@ -736,6 +736,24 @@ namespace spot
return is_binop(f, binop::U);
}
binop*
is_M(formula* f)
{
return is_binop(f, binop::M);
}
binop*
is_R(formula* f)
{
return is_binop(f, binop::R);
}
binop*
is_W(formula* f)
{
return is_binop(f, binop::W);
}
formula*
unop_multop(unop::type uop, multop::type mop, multop::vec* v)
{
@ -1061,6 +1079,20 @@ namespace spot
return;
}
// F(a M b) = F(a & b)
bo = is_M(result_);
if (bo)
{
formula* r =
unop::instance(unop::F,
multop::instance(multop::And,
bo->first()->clone(),
bo->second()->clone()));
bo->destroy();
result_ = recurse_destroy(r);
return;
}
// FX(a) = XF(a)
{
unop* u = is_X(result_);
@ -1113,17 +1145,28 @@ namespace spot
{
// G(a R b) = G(b)
if (result_->kind() == formula::BinOp)
binop* bo = is_R(result_);
if (bo)
{
binop* bo = static_cast<binop*>(result_);
if (bo->op() == binop::R)
{
formula* r =
unop::instance(unop::G, bo->second()->clone());
bo->destroy();
result_ = recurse_destroy(r);
return;
}
formula* r =
unop::instance(unop::G, bo->second()->clone());
bo->destroy();
result_ = recurse_destroy(r);
return;
}
// G(a W b) = G(a | b)
bo = is_W(result_);
if (bo)
{
formula* r =
unop::instance(unop::G,
multop::instance(multop::Or,
bo->first()->clone(),
bo->second()->clone()));
bo->destroy();
result_ = recurse_destroy(r);
return;
}
// GX(a) = XG(a)