BrowserUk:

I didn't get anywhere on your binary string analysis problem yesterday. I was working on a couple different things, but none of 'em led me anywhere good. Anyway, for the fringe thing:

$ cat Fringe.pl
#!/usr/bin/perl
use strict;

my $tree1 = [ 'd', [ 'c', [ 'a', 'b', ], ], ];
my $tree2 = [ [ 'd', 'c' ], [ 'a', 'b' ] ];
#my $tree2 = [ [ [ 'd', 'c', ], 'a', ], 'b', ];

my $ti1 = get_tree_iterator($tree1);
my $ti2 = get_tree_iterator($tree2);

my $cnt_mismatches=0;
while (1) {
    my ($L, $R) = ($ti1->(), $ti2->());
    ++$cnt_mismatches unless ($R eq $L) or (!$L and !$R);
    print "L=$L, R=$R\n";
    last if !defined $L;
}
print $cnt_mismatches ? "$cnt_mismatches mismatches" : "TREES MATCH!",
+ "\n";

sub get_tree_iterator {
    my @stack = (shift);
    return sub {
        unshift @stack, @{shift @stack} while @stack and ref $stack[0]
+ eq 'ARRAY';
        return shift @stack;
    }
}
$ perl Fringe.pl
L=d, R=d
L=c, R=c
L=a, R=a
L=b, R=b
L=, R=
TREES MATCH!

[download]

Update: I've posted a version (with the better iterator mentioned further down in this thread) to Rosetta Code. I couldn't find my original account information (or perhaps I misremembered and didn't create an account there. I didn't want to clutter up the thread with yet another version. I've also made that one meet the spec (i.e., early termination).

...roboticus

When your only tool is a hammer, all problems look like your thumb.

In reply to Re: Challenge: Perl 5: lazy sameFinge()? by roboticus
in thread Challenge: Perl 5: lazy sameFringe()? by BrowserUk

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