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Fix handling of 1 in trivial identities for rational operators.

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Especially, 1&f and 1:f were mistakenly always reduced to f, which is
incorrect when f accept the empty word.

* src/ltlast/multop.cc: Here.
* src/ltlast/multop.hh, doc/tl/tl.tex: Adjust documentation.
* src/ltltest/equals.test: Add more tests.
This commit is contained in:
Alexandre Duret-Lutz 2012-04-19 18:09:20 +02:00
parent 691119c188
commit 5bea6e4950
4 changed files with 91 additions and 37 deletions
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11
src/ltltest/equals.test
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@ -149,6 +149,17 @@ run 0 ../equals '{{a;b}:b:c:d*:e:f}!' '{{a;b}:{b && c }:d[*]:{e && f}}!'
run 0 ../equals '{a:b:c}|->!Xb' '!(a&&b&&c) | !Xb'
run 0 ../equals '{a:b:c*}|->!Xb' '{(a&&b):c*}|-> !Xb'
run 0 ../equals '{a&b&c*}|->!Xb' '{(a&&b)&c*}|-> !Xb'
run 0 ../equals '{0&{f;g*}}!' '0'
run 0 ../equals '{1&{f;g*}}!' '{f;g*}!'
# 1 should not be removed in the following two formulae
run 1 ../equals '{1&{g*}}!' '{g*}!'
run 1 ../equals '{1|{b;c}}<>->a' '{b;c}<>->a'
run 0 ../equals '{1:{a;b}:1:c*}!' '{{a;b}:c*}!'
run 0 ../equals '{c*:1:{a;b}:1}!' '{c*:{a;b}}!'
# make sure twin arguments are not reduced in Fusion.
run 1 ../equals '{(a;!a)*:(a;!a)*:b}!' '{(a;!a)*:b}!'
# make sure 1:a* is not reduced to a*.
run 1 ../equals '{(1:a*);b}!' '{a*;b}!'
run 0 ../equals '{a[*0]}' '{[*0]}'
run 0 ../equals '{a[*..]}' '{a[*]}'