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tl: fix the definition of ##[i:j]

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Reported by Victor Khomenko.

* NEWS, doc/tl/tl.tex, spot/tl/formula.cc: Fix the definition.
* tests/core/ltl2tgba.test: Add some test cases.
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Alexandre Duret-Lutz 2019-05-19 09:12:59 +02:00
parent 60bdf5de19
commit 66a3b6f7cb
4 changed files with 53 additions and 21 deletions
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9
NEWS
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@ -60,10 +60,11 @@ New in spot 2.7.4.dev (not yet released)
- The parser for SERE learned to recognize the ##n and ##[i:j]
operators from SVA. So {##2 a ##0 b[+] ##1 c ##2 e} is another
way to write {[*2];a:b[+];c;1;e}, and {a ##[i:j] b} is parsed as
{a:{[*i..j];b}}. The formula::sugar_delay() function implement
this SVA operator in terms of the existing PSL operators.
##[+] and ##[*] are sugar for ##[1:$] and ##[0:$].
way to write {[*2];a:b[+];c;1;e}. The syntax {a ##[i:j] b} is
replaced in different ways depending on the values of i, a, and b.
The formula::sugar_delay() function implement this SVA operator in
terms of the existing PSL operators. ##[+] and ##[*] are sugar
for ##[1:$] and ##[0:$].
- spot::relabel_apply() make it easier to reverse the effect
of spot::relabel() or spot::relabel_bse() on formula.