[rules-dev] 'if' in guided editor

[Mark Proctor]

It's not so much imperative/declarative but that if indictes its part of 
a sequence of logic, when is more atomic - but it is contrived :)

Michael Neale wrote:
> yes its only a tool thing, exactly. purely for the UI, so it can say 
> whatever we want.
>
> "When" is OK with me - but I am not sure if the argument of if == 
> imperative vs. when == declarative is the best - it may make sense to 
> new users, but it does sound a little contrived to me (I always 
> cringed at the explanation).
>
> I guess pragmatically speaking: Java, C, C#, C++, perl, python, ruby 
> all have "if" but not "when" - given they are the most common 
> imperative languages, using "when" probably makes good sense as a 
> differentiation point now I think of it.
>
> The Rule Modeller localisation mainly comes down to i18n style 
> .properties files anyway - whereas DSL is user customisable - but we 
> could make it use a DSL file eventually.
>
> basically, platofrm i18n will eventually be done by engineering 
> services here, but it will really be based on user demand, whereas DSL 
> allows users to do what they want when they want.
>
> On 2/27/07, *Edson Tirelli* <tirelli at post.com 
> <mailto:tirelli at post.com>> wrote:
>
>
>        Mark,
>
>        Yes, from a DSL Compiler perspective, keywords are
>     customizable. But
>     from tools perspective, they need to add support to that. Also, I
>     think
>     Michael is generating DRL directly from the editor, aren't you
>     Mic? So
>     this is only a tool thing...
>
>        []s
>        Edson
>
>
>     Mark Proctor wrote:
>
>     > Is using 'if' and 'when' confusing? should be not standardise
>     over it?
>     >
>     > I think "when" is used as you say "when this then that" not
>     "when this
>     > maybe this or maybe that else that", where as if/else is a common
>     > usage - so helps emphasis that rules are more atomic.
>     >
>     > With Edson's work is this not all localisable now anyway? If so,
>     need
>     > to make sure that the guided editors obey his keyword
>     localisation work.
>     >
>     > Mark
>     > Michael Neale wrote:
>     >
>     >> no, it was just to be different. It can be anything. It can be
>     >>
>     >> "wassup" or something ;)
>     >>
>     >> Not sure if that explanation has any real meaning, I mean it
>     makes a
>     >> point, but "when" actually implies to me that it is slightly
>     temporal
>     >> (ie "when" means it will happen, at some point in time, where
>     as "if"
>     >> means it may or may not happen - neither of which are
>     >> procedural/imperative).
>     >>
>     >> I think its ok to say IF, as people still say "if/then" for
>     >> production rules, its not really confusing - perhaps we need
>     another
>     >> way to explain imperative versus declarative.
>     >>
>     >> On 2/26/07, *Mark Proctor* < mproctor at codehaus.org
>     <mailto:mproctor at codehaus.org>
>     >> <mailto:mproctor at codehaus.org <mailto:mproctor at codehaus.org>>>
>     wrote:
>     >>
>     >>     I noticed that 'if' is used in the guided editor instead of
>     >>     'when', whats the reason for this? As currently I explain
>     the use
>     >>     of 'when' because it indicates its not procedular, where as
>     'if'
>     >>     is considered part of a procedural logic flow. Will this
>     confuse
>     >>     that explanation?
>     >>
>     >>
>     >>
>     >>     Mark
>     >>
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>     --
>     Edson Tirelli
>     Software Engineer - JBoss Rules Core Developer
>     Office: +55 11 3124-6000
>     Mobile: +55 11 9218-4151
>     JBoss, a division of Red Hat @ www.jboss.com <http://www.jboss.com>
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