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create a CODE ref from a parse tree?

by perl5ever (Pilgrim)
on Sep 08, 2012 at 16:21 UTC ( #992502=perlquestion: print w/ replies, xml ) Need Help??
perl5ever has asked for the wisdom of the Perl Monks concerning the following question:

It is possible to create a CODE ref that is based on the _parse tree_ of another CODE ref?

Normally we create CODE refs by specifying the source code for the subroutine.

I would like to create a perl function which takes a CODE ref as input, accesses the parse tree of the CODE ref and creates a new sub by specifying what the new sub's parse tree should be. Also, the new parse tree could contain elements from the first sub's parse tree.

Is this possible?

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Comment on create a CODE ref from a parse tree?
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Re: create a CODE ref from a parse tree?
by Corion (Pope) on Sep 08, 2012 at 16:43 UTC
    If you want to customize a subroutine behaviour, pass it a callback (a subroutine reference). Perl has no macro expansion.
Re: create a CODE ref from a parse tree?
by ig (Vicar) on Sep 08, 2012 at 19:45 UTC
Re: create a CODE ref from a parse tree?
by chromatic (Archbishop) on Sep 08, 2012 at 17:12 UTC

    What do you mean by parse tree?

      That's a good question. I guess I would want whatever perl uses for the internal representation of the CODE ref.

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