[rules-dev] Long DSL lines

[Tihomir Surdilovic]

Was thinking of something like this:

declare dsl ApplicantValidity
    mapTo : invalidAgeDSLRule
    when : Applicant is younger than $age
    then : Applicant is not valid

    mapTo: validAgeDSLRule
    when : Applicant is older than $age
    then : Applicant is valid
end

rule invalidAgeDSLRule
when
    $a : Applicant( $age : age < ? )
then
    $a.setValid( false );
end


rule validAgeDSLRule
when
    $a : Applicant( $age : age > ? )
then
    $a.setValid( true );
end

would be following declaring new facts somewhat and you can benefit from 
any attributes set on the dsl mapTo rules as well ...any thoughts ??

Thanks.



On 12/6/10 3:09 PM, Wolfgang Laun wrote:
> Well, it won't give you a proper line number for an error that's 
> somewhere within a single range of \-escaped
> newlines, but I reinsert the "stolen" newlines at the earliest 
> possible moment. This ensures that line numbers
> in error messages are correct w.r.t. the start of a logical line.
>
> -W
>
>
> On 6 December 2010 21:00, Michael Neale <michael.neale at gmail.com 
> <mailto:michael.neale at gmail.com>> wrote:
>
>     only objection I would have is that the error numbers in the
>     expanded syntax (should there be compile errors) would not line up
>     with the source (which makes it slightly more annoying than it
>     already is to sort out).
>
>     But as this thread goes on, perhaps some more holistic thought to
>     what we want DSLv2 to be like is in order.
>
>
>     On Sun, Dec 5, 2010 at 5:33 AM, Wolfgang Laun
>     <wolfgang.laun at gmail.com <mailto:wolfgang.laun at gmail.com>> wrote:
>
>         Currently each entry must be a single line of text. This
>         results in long lines, especially on the RHS.
>
>         I have experimentally inserted a transformation of the DSL
>         text (in  DSLTokenizedMappingFile)
>         which converts '\'+EOL on the fly to a space. (The passed-in
>         reader is read into a buffer, '\'+EOL
>         is translated to space, and EOLs are inserted later to
>         readjust the line number.) In a text editor,
>         I can now write, e.g.,
>
>         then][][Bb]ook the customer for the flight=\
>           $f.setAvailable( $f.getAvailable() - 1 );\
>           update( $f );                            \
>           Booking booking = new Booking();         \
>           booking.setCustomer( $r.getCustomer() ); \
>           booking.setFlight( $f );                 \
>           insert( booking );
>
>         Of course, the DSL editor will not preserve this, but future
>         development might provide more
>         convenient editing there, too.
>
>         Any objections?
>         -W
>
>         _______________________________________________
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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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