Selection sets, AND/OR, and parentheses

[Kenneth Brody]

To clarify ("further confuse"?) the issue of selection sets, using
AND and OR, and parentheses...

First, AND and OR have the same precedence.

However, the selection sentence parser has a "quirk" in which they
are given right-associativity rather than the expected left.

This means that the sentence:

    a AND b OR c

is treated (as previously noted) as:

    a AND ( b OR c )

When using only ANDs or only ORs, this has no net effect, as these
will always give the same result:

    a AND ( b AND ( c AND D ) )
versus
    ( ( a AND b ) AND c ) AND d


I believe that filePro has always treated selection sets in this way,
and there are no plans on changing the behavior, as doing so would
change the behavior of any non-parenthesized selection sentence out
there.

-- 
+-------------------------+--------------------+-----------------------+
| Kenneth J. Brody        | www.hvcomputer.com | #include              |
| kenbrody/at\spamcop.net | www.fptech.com     |    <std_disclaimer.h> |
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