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my $code = <<END_CODE; owns(merlyn,gold). owns(ovid,books). owns(kudra,gold). valuable(perl). valuable(gold). valuable(corinna). query :- owns(X,Y), valuable(Y), writef('["%t", "%t"], ',[X,Y]). main :- writef('[ '), bagof(_,query,_), writef(']\n'). END_CODE my $tmpfile = ""; open(TMP,">$tmpfile"); print TMP $code; close(TMP); my $result = `pl -q -f -t main`; unlink($tmpfile); print $result;
yields this
[ ["merlyn", "gold"], ["kudra", "gold"], ]
using SWI-Prolog. Perl is great at generating code, handing it to an industrial-strength backtracking engine, and scraping the result (though there is also Language::Prolog::Yaswi

In reply to Re: Being Forced to Fork with Nested Regular Expressions by mnc
in thread Being Forced to Fork with Nested Regular Expressions by Ovid

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