Thanks a lot ... unfortunately I'm too busy like now to test it all out or elaborate much further.

> I imagine that packages named IN and LIKE are unlikely to clash with other packages...

That's true but I'm looking for a general "solution" ...

> Also, by "disabling", do you mean actually undefining the methods, or just setting a flag such that they fail when called outside of the appropriate scope (whichever one that is)?

hmm good question...

Ideally I'd like to be able to attach a "domain" to a code block to automatically have package and uses prepended, something like 

sub SQL(&) :prepend('package mySQL; use DSL::mySQL;') {
   ...
}

[download]

and whenever I execute 

SQL {
  SELECT {} FROM {} WHERE {}
}

[download]

then the code block is already parsed with methods imported from DSL::SQL which are not visible outside of the code block. OTOH variables from the outer scope would be visible inside the inner scope.

some background¹ ...

I'm meditating about internal DSLs ("Domain Specific Languages") and ideally a "sub language" could be included adding new "syntax" (or better phrased syntactic sugar) not leaking to the outer scope.

Traditionally we often use outer DSLs defined in strings/files which need to be parsed and evaluated. Take for instance a template system like TT.

CGI.pm used to have an inner DSL to build HTML, there is also Jade for HTML in JS or LINQ for SQL in .NET .

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!

¹) well this should better be in the meditation section ...

In reply to Re^2: [DSL] disabling packages in Perl? (meditation) by LanX
in thread [DSL] disabling packages in Perl? by LanX

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