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Fix universal and eventual rules for M and W.

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* src/ltlast/binop.cc: a M b is eventual if both a and b are
eventual, or if b == 1.  a W b is universal if both a and b
are universal or if b == 0.
* src/ltltest/kind.test: New test case.
This commit is contained in:
Alexandre Duret-Lutz 2011-10-30 18:15:20 +01:00
parent c9a659c8d4
commit cd9369c186
2 changed files with 14 additions and 10 deletions
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22
src/ltlast/binop.cc
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@ -49,12 +49,16 @@ namespace spot
// universality and eventuality.
props = first->get_props() & second->get_props();
// The matter can be further refined because:
// (f U g) and (g M f) are pure eventualities if
// g is a pure eventuality (regardless of f)
// or f == 1
// (f W g) and (g R f) are purely universal if
// f is purely universal (regardless of g)
// or g == 0
// (f U g) is a pure eventuality if
// g is a pure eventuality (regardless of f),
// or f == 1
// (g M f) is a pure eventuality if f and g are,
// or f == 1
// (g R f) is purely universal if
// f is purely universal (regardless of g)
// or g == 0
// (f W g) is purely universal if f and g are
// or g == 0
switch (op)
{
case Xor:
@ -177,8 +181,7 @@ namespace spot
// is.syntactic_persistence = Persistence U Persistance
break;
case W:
// f W g is universal if f is universal, or if g == 0.
is.universal = first->is_universal();
// f W g is universal if f and g are, or if g == 0.
is.universal |= (second == constant::false_instance());
is.boolean = false;
is.eltl_formula = false;
@ -217,8 +220,7 @@ namespace spot
break;
case M:
// g M f is universal if g is eventual, or if f == 1.
is.eventual = first->is_eventual();
// g M f is eventual if both g and f are eventual, or if f == 1.
is.eventual |= (second == constant::true_instance());
is.boolean = false;
is.eltl_formula = false;