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tl: new PSL trivial simplifications

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Always rewrite {[*]}[]->0 as 0, and {[*]}<>->1 = 1.  Fixes #572.

* spot/tl/formula.cc: Implement them.
* doc/tl/tl.tex, NEWS: Document them.
* tests/core/equals.test: Test those.
This commit is contained in:
Alexandre Duret-Lutz 2024-05-13 22:15:15 +02:00
parent a826a4ae6f
commit ed91f59bbd
4 changed files with 13 additions and 2 deletions
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6
spot/tl/formula.cc
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@ -1163,6 +1163,7 @@ namespace spot
// - 1 <>-> Exp = Exp
// - [*0] <>-> Exp = 0
// - Exp <>-> 0 = 0
// - [*] <>-> 1 = 1
// - boolExp <>-> Exp = boolExp & Exp
if (first->is_tt())
return second;
@ -1172,7 +1173,7 @@ namespace spot
second->destroy();
return ff();
}
if (second->is_ff())
if (second->is_ff() || (second->is_tt() && first == one_star()))
{
first->destroy();
return second;
@ -1185,6 +1186,7 @@ namespace spot
// - 1 []-> Exp = Exp
// - [*0] []-> Exp = 1
// - Exp []-> 1 = 1
// - [*] []-> 0 = 0
// - boolExp []-> Exp = !boolExp | Exp
if (first->is_tt())
return second;
@ -1194,7 +1196,7 @@ namespace spot
second->destroy();
return tt();
}
if (second->is_tt())
if (second->is_tt() || (second->is_ff() && first == one_star()))
{
first->destroy();
return second;