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yes, ? wasn't easy due to java and data munging would get messy as
we map between things.<br>
<br>
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<br>
Person( age : age )<br>
Person( age == age )<br>
<br>
The above looks a little confusing compared to:<br>
Person( $age : age )<br>
Person( age == $age )<br>
<br>
Davide wants to enforce the $ prefix so that parsing can be easier.<br>
<br>
Mark<br>
On 24/09/2010 00:31, Michael Neale wrote:
<blockquote
cite="mid:AANLkTimDnOjW_ozVqOz=W-pTheT=ftq3Nv1AU-wh+4rb@mail.gmail.com"
type="cite">The $name: Pattern thing I am convinced is to do with
Mark's prior history of being abused by perl ;)
<div><br>
</div>
<div>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. </div>
<div><br>
So here we are ;)</div>
<div><br>
<br>
<div class="gmail_quote">On Fri, Sep 24, 2010 at 12:29 AM, Greg
Barton <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:greg_barton@yahoo.com">greg_barton@yahoo.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<div bgcolor="#FFFFFF">
<div>Yes, and I don't think we want to take readability
cues from Perl. :)<br>
<font color="#888888"><br>
GreG</font></div>
<div>
<div class="h5">
<div><br>
On Sep 23, 2010, at 3:03, Wolfgang Laun <<a
moz-do-not-send="true"
href="mailto:wolfgang.laun@gmail.com"
target="_blank">wolfgang.laun@gmail.com</a>>
wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>On 23 September 2010 09:31, Bruno Unna <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:bruno.unna@gmail.com"
target="_blank">bruno.unna@gmail.com</a>></span>
wrote:<br>
<div class="gmail_quote">
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204,
204); margin: 0pt 0pt 0pt 0.8ex; padding-left:
1ex;">
<div>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 (<a moz-do-not-send="true"
href="http://bit.ly/dgw4GT"
target="_blank">http://bit.ly/dgw4GT</a>):
<div>
<br>
</div>
</div>
</blockquote>
<div><br>
Low precedence "and", "or", "xor" were
introduced to permit "Perl poetry", or, more
seriously, to<br>
permit control flow using a logical
expression, especially after function calls
without parentheses. <br>
see Naples or die; # same as: see(Napes)
|| die(); but not: see(Naples || die() );<br>
<br>
No way this makes any sense in Drools.<br>
<br>
-W<br>
<br>
</div>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204,
204); margin: 0pt 0pt 0pt 0.8ex; padding-left:
1ex;">
<div>
<div>
<blockquote type="cite">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.</blockquote>
</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>Regards.<br>
<div><br>
</div>
<br>
</div>
</div>
</blockquote>
</div>
<br>
</div>
</blockquote>
</div>
</div>
<div class="im">
<blockquote type="cite">
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<br>
<br clear="all">
<br>
-- <br>
Michael D Neale<br>
home: <a moz-do-not-send="true"
href="http://www.michaelneale.net">www.michaelneale.net</a><br>
blog: <a moz-do-not-send="true"
href="http://michaelneale.blogspot.com">michaelneale.blogspot.com</a><br>
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