[rules-dev] Drools syntax diagrams - redrawn

[Michael Neale]

that would be a major breakage though - as a lot of people don't use that.
Would want to take some time enforcing it.

It looks ugly to me, but I can understand why people like it, even if I
don't.

On Fri, Sep 24, 2010 at 9:50 AM, Mauricio Salatino <salaboy at gmail.com>wrote:

> cool.. I think that it's a great idea to enforce it..
> giving people to much choices to do the same always complicates things.
>
>
> On Thu, Sep 23, 2010 at 8:46 PM, Mark Proctor <mproctor at codehaus.org>wrote:
>
>>  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 <greg_barton at yahoo.com>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 <wolfgang.laun at gmail.com> wrote:
>>>
>>>  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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>>
>>
>> --
>> Michael D Neale
>> home: www.michaelneale.net
>> blog: michaelneale.blogspot.com
>>
>>
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>
>
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-- 
Michael D Neale
home: www.michaelneale.net
blog: michaelneale.blogspot.com
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