[rules-dev] Drools syntax diagrams - redrawn

[Wolfgang Laun]

On 23 September 2010 09:31, Bruno Unna <bruno.unna at gmail.com> wrote:

> FWIW: in Perl, there are both operators as well (|| and 'or'). However,
> they are *not* exactly the same. Although they can be used in any context to
> render a boolean expression, their priority makes the difference. Taken from
> official documentation (http://bit.ly/dgw4GT):
>
>
Low precedence "and", "or", "xor" were introduced to permit "Perl poetry",
or, more seriously, to
permit control flow using a logical expression, especially after function
calls without parentheses.
   see Naples or die;  # same as: see(Napes) || die(); but not: see(Naples
|| die() );

No way this makes any sense in Drools.

-W

Binary "or" returns the logical disjunction of the two surrounding
> expressions. It's equivalent to || except for the very low precedence. This
> makes it useful for control flow.
>
>
> Nonetheless, it must be taken into account that the distinction makes sense
> for a Perl programmer. For a rules-writing guy (or girl) perhaps the
> distinction is extremely obscure.
>
> Regards.
>
>
>
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