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Re: Implementing (elisp-like) buffers in Perl 6: how to do buffer-localisation of arbitrary package variables?

by premchai21 (Curate)
on Mar 28, 2003 at 19:02 UTC ( #246536=note: print w/ replies, xml ) Need Help??


in reply to Implementing (elisp-like) buffers in Perl 6: how to do buffer-localisation of arbitrary package variables?

Could you have an on-buffer-change hook of some sort that accesses a data structure keeping track of which variables were buffer-local to which buffers and swaps their values in and out appropriately?

That is, something like (quite untested):

sub onBufferChange { my ($from, $to) = @_; for my $scl (values $from->{locals}) { $$$scl[0] = $globalLocals{$$scl[0]}[1]; } for my $scl (values $to->{locals}) { exists $globalLocals{$$scl[0]} or $globalLocals{$$scl[0]} = [$$scl[0], $$$scl[0]]; $$$scl[0] = $$scl[1]; } }

I have the feeling I've missed the point...


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Re: Implementing (elisp-like) buffers in Perl 6: how to do buffer-localisation of arbitrary package variables?
by jonadab (Parson) on Mar 29, 2003 at 00:22 UTC

    ++

    I actually feel pretty stupid for not seeing that. It's quite simple, really: rather than making the current buffer a package variable on the buffer class, I just make it a method (that functions as an lvalue if need be; I'm pretty sure that's possible in Perl6) on the buffer class, and then I can do whatever symbol table changes I need to do. It makes changing buffers very frequently a little more inefficient, but it won't be a big deal unless you have a lot of buffer-local variables, and in that case it's worth it because you're really using the feature. And actually, it's probably not less efficient than making every variable lookup check for buffer-localness.

    I'm happy. Perl6 is going to be so cool. Here's looking forward to the next Apocalypse :-)


    for(unpack("C*",'GGGG?GGGG?O__\?WccW?{GCw?Wcc{?Wcc~?Wcc{?~cc' .'W?')){$j=$_-63;++$a;for$p(0..7){$h[$p][$a]=$j%2;$j/=2}}for$ p(0..7){for$a(1..45){$_=($h[$p-1][$a])?'#':' ';print}print$/}

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