yes, ? wasn't easy due to java and data munging would get messy as we
map between things.
So we just left it as any valid java identifier, but using the $ prefix
as a coding convention make it easier to differentiate fieldnames and
bindings
Person( age : age )
Person( age == age )
The above looks a little confusing compared to:
Person( $age : age )
Person( age == $age )
Davide wants to enforce the $ prefix so that parsing can be easier.
Mark
On 24/09/2010 00:31, Michael Neale wrote:
The $name: Pattern thing I am convinced is to do with Mark's prior
history of being abused by perl ;)
But the real reason is we wanted to use ?name: Pattern() - using "?"
like the clips lineage of languages - but IIRC even ilog allows that.
We wanted our labels to be compatible with java source code - where
$variable is a valid name (although no one actually uses it) and ?name
is not.
So here we are ;)
On Fri, Sep 24, 2010 at 12:29 AM, Greg Barton <[email protected]
<mailto:[email protected]>> wrote:
Yes, and I don't think we want to take readability cues from Perl. :)
GreG
On Sep 23, 2010, at 3:03, Wolfgang Laun <[email protected]
<mailto:[email protected]>> wrote:
On 23 September 2010 09:31, Bruno Unna <[email protected]
<mailto:[email protected]>> 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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--
Michael D Neale
home: www.michaelneale.net <http://www.michaelneale.net>
blog: michaelneale.blogspot.com <http://michaelneale.blogspot.com>
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