[rules-dev] DSL: progress report

[Mauricio Salatino]

Pretty cool Wolfgang!
Good Job!
Let me know when you have something to test!

On Thu, Dec 9, 2010 at 4:28 AM, Wolfgang Laun <wolfgang.laun at gmail.com>wrote:

> *Long lines:* \-escape is working satisfactorily, But I'll look into the
> option of merging lines depending on the first chars in the next line, which
> would be much more attractive.
>
> *DSLR analysis*: is a little more lenient; you may have, for instance
> "when there is a foo" on a single line, and the trigger keywords
> (rule,query, when then, end) may be indented.
>
> *Substitution:* is now done "manually" rather than with
> Matcher.replaceAll(). This eliminates some problems with '\' and '$' and
> creates the opportunity for new features.
>
> *New features:* I'm experimenting with using key-value pairs saved from
> preceding lines to provide a replacement value for a {}-variable that isn't
> defined on the current line. Also, a variable reference such as
> {variable-name!function-name} is simple to implement; case conversions would
> be useful functions.
>    [when]there is an? {entity}=${entity!lc}: {entity!ucf}()
>    [then]discard the fact=retract( ${entity!lc} );
> But these features depend on "reasonable" {}-variable names.
>
> *Open issue:* {}-variable may contain almost any Unicode character. This
> causes much pain in the parser and even more in the expander; and users are
> burdened with having to escape this or that character. Is it really a good
> or important thing to be able to write a variable name like
> ><!@%^*|+?,/''"|&().; and/or escape sequences?? If someone would make a
> decisive statement ("has to remain as it is" OR "restrict to the usual
> lexical identifier syntax") I'd appreciate this very much.
>
> Best
> Wolfgang
>
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