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fixes the behavior of the manual mode group.
The current manual mode preferred content expression is:
"present and (((exclude=*/archive/* and exclude=archive/*) or (not (copies=archive:1 or copies=smallarchive:1))) or (not copies=semitrusted+:1))"
The old matcher misparsed this, to basically:
OR (present and (...)) (not copies=semitrusted+:1))
The paren handling and indeed the whole conversion from tokens to the
matcher was just wrong. The new way may not be the cleverest, but I think
it is correct, and you can see how it pattern matches structurally against
the expressions when parsing them.
That expression is now parsed to:
MAnd (MOp <function>)
(MOr (MOr (MAnd (MOp <function>) (MOp <function>)) (MNot (MOr (MOp <function>) (MOp <function>))))
(MNot (MOp <function>)))
Which appears correct, and behaves correct in testing.
Also threw in a simplifier, so the final generated Matcher has less
unnecessary clutter in it. Mostly so that I could more easily read &
confirm them.
Also, added a simple test of the Matcher to the test suite.
There is a small chance of badly formed preferred content expressions
behaving differently than before due to this rewrite.
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Joey Hess
https://www.google.com/accounts/o8/id?id=AItOawknOATcOkmzX4jKuET5Z2RsaFUNnLKnQsU