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RE: Re: Search Engine Theory

by httptech (Chaplain)
on Jun 06, 2000 at 15:56 UTC ( [id://16584]=note: print w/replies, xml ) Need Help??

in reply to Re: Search Engine Theory
in thread Search Engine Theory

Clever. I like it. Would it not be a good idea to record the name of the file only once? Like:
foo: index.html,5,18; bar: index.html,6;page1.html,1; baz: index.html,7;
That would make the index smaller. Then with some trivial splitting, you end up with something like:
$seq{'foo'}{'index.html'} = [5,18]; $seq{'bar'}{'index.html'} = [6]; $seq{'bar'}{'page1.html'} = [1]; $seq{'baz'}{'index.html'} = [7];
Now I just need a clever algorithm to iterate over it all and figure out which document has foo bar baz in order. Hmmm.

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RE: RE: Re: Search Engine Theory
by nardo (Friar) on Jun 06, 2000 at 20:16 UTC
    The following should work, but it's off the top of my head and hasn't been thought out, so it's possible there's a better algorithm and it's also possible there's a bug in the code, so be sure to give it a good once over to make sure i haven't screwed up somewhere.

    $seq{'foo'}{'index.html'} = [5,18]; $seq{'bar'}{'index.html'} = [6]; $seq{'bar'}{'page1.html'} = [1]; $seq{'baz'}{'index.html'} = [7]; @pages = &find_phrase("foo bar baz"); sub find_phrase { my @words = split(/\s+/, $_[0]); my $word = shift @words; my $pos; my $page; my %found; foreach $page (keys %{$seq{$word}}) { foreach $pos (@{$seq{$word}{$page}}) { if(&find_phrase_at($page, $pos + 1, @words)) { $found{$page} = 1; } } } return keys %found; } sub find_phrase_at { my $file = shift; my $position = shift; my @words = @_; my $word; if(@words == 0) { return 1; } $word = shift @words; if(grep($_ == $position, @{$seq{$word}{$file}})) { return &find_phrase_at($file, $position + 1, @words); } return 0; }

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