Hello all,
here is my first modest attempt at a JAPH. Please note the purely functional style (appart from the necessary side-effect of outputting something ;-) ).
Those who'll recognize the mechanism will probably have a smile in reminescence of that powerful and inefficient way of computing.
If there is some interest I will post an article on the theory behind this (unless it's been done here before).
Please enjoy, comments and suggestions would be greatly appreciated!
Schemer
here is my first modest attempt at a JAPH. Please note the purely functional style (appart from the necessary side-effect of outputting something ;-) ).
Those who'll recognize the mechanism will probably have a smile in reminescence of that powerful and inefficient way of computing.
If there is some interest I will post an article on the theory behind this (unless it's been done here before).
Please enjoy, comments and suggestions would be greatly appreciated!
Schemer
#!/usr/bin/perl -w use strict; # author: guillaume[at]nulko.com # functions sub z { shift(); return shift(); } sub u { return n(\&z); } sub d { return n(n(\&z)); } sub t { return lp(u)->(d); } sub f { return um(d)->(d); } sub c { return lp(t)->(d); } sub a { return shift() + 1; } sub w { return chr g(shift()) } sub g { return shift()->(\&a, 0); } sub p { print w(um(shift())->(u)); } # functions building functions sub lp { my $a = shift(); return sub { return $a->(\&n,shift()) } } sub um { my $a = shift(); return sub { return $a->(lp(shift()),\&z) } } sub n { my $a = shift(); return sub { my $b = shift(); return $b->($a->($b, shift())) } } # Lambda, the ultimate... $_='p(um(lp(u)->(um(um(t )->(t))->(f)))->(d)) ,p(um(um(lp(u)->(um( t)->(f)))->(t))->(t) ),p(um(lp(u)->(um(lp (u)->(um(d)->(c)))-> (d)))->(c)),p(um(lp( u)->(um(lp(u)->(um(d )->(t)))->(f)))->(f) ),p(um(um(d)->(f))-> (f)),p(lp(u)->(um(um (um(d)->(t))->(f))-> (f))),p(um(um(lp(u)- >(um(d)->(c)))->(d)) ->(c)),p(um(lp(u)->( um(um(t)->(t))->(f)) )->(t)),p(um(lp(u)-> (um(lp(u)->(um(d)->( t))) ->(f))) ->(f)), p (um(um(lp(u)->(um(t)->(f) ))->(d))->(f)),p(lp(u)->(um (um(f)->(c))->(c))),p(um(um(l p(u)->(um( um(d)->(t))->(t)))-> (d))->(t)) ,p(um(um(d)->(f))->( f)),p(um(u m(f)->(f))->(c)),p(l p(u)->(um( um(f)->(c))->(c))),p (um(um(lp( u)->(um(um(d)->(t))- >(t)))->(d ))->(t)),p(um(um(um( t)->(t))-> (t))->(f)),p(um(um(d )->(f))->( f)),p(um(um(lp(u)->( um(t)->(f) ))->(d))->(f)),p(lp( u)->(um(um (um(d)->(t))->(f))-> (f))),p(um (um(lp(u)->(um(d)->( c)))->(t)) ->(t)),p(lp(u)->(um( lp(u)->(um (lp(u)->(um(t)->(f)) )->(f)))-> (d))),p(lp(u)->(um(u m(f)->(c)) ->(c))),p(um(um(lp(u )->(um(um( d)->(t))->(t)))->(d) )->(t)),p( um(lp(u)->(um(d)->(c )))->(f)),p(um( d)->(c))',s/\s*//g,eval
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Re: (Almost) Purely Functional JAPH
by Aristotle (Chancellor) on Nov 21, 2003 at 15:25 UTC |
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