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Bringing Logic Programming to Perl

by Ovid (Cardinal)
on Jan 21, 2005 at 17:36 UTC ( #424075=perlmeditation: print w/replies, xml ) Need Help??

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  1. or download this
    # Thanks to aristotle for making the regex simpler
    my $string = "abcd";
    my @perms;
    my $regex = qr/(\G[abcd]{0,4}(?{print "# [$&][$'][$string]\n"}))/ x 2;
    $string =~ $regex;
    
  2. or download this
    # [abcd][][abcd]
    # [abc][d][abcd]
    # [ab][cd][abcd]
    # [a][bcd][abcd]
    # [][abcd][abcd]
    # [abcd][][abcd]
    
  3. or download this
    append([], X, X).
    append([W|X],Y,[W|Z]) :- append(X,Y,Z).
    
  4. or download this
    [a,b,c],[d,e,f],[a,b,c,d,e,f] 
      if [b,c],[d,e,f],[b,c,d,e,f]
      if [c],[d,e,f],[c,d,e,f]
      if [],[d,e,f],[d,e,f]
    
  5. or download this
    #!/usr/local/bin/perl -l
    
    use strict;
    ...
        "append([], X, X)."
       ."append([W|X],Y,[W|Z]) :- append(X,Y,Z).";
    }
    
  6. or download this
    Appending two lists 'append([a],[b,c,d],Z).'
    append([a],[b,c,d],[a,b,c,d])
    
    ...
    append([a,b],[c,d],[a,b,c,d])
    append([a,b,c],[d],[a,b,c,d])
    append([a,b,c,d],[],[a,b,c,d])
    

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