Sure. It is still not very polished but the algorithm should be quite optimal..Note that the brackets here are insertions and deletions, not new or common words! If you want this, I would mark these words in a postprocessing step. However, I think this information is not as important as insertions/deletions. They tell you exactly how to transform one string into the other. So I would use different colors for unique or common words.
my @output;
printDiff($#s1, $#s2);
print join "\n", @output;
sub printDiff {
my ($i, $j) = @_;
if ($i > 0 && $j > 0 and $s1[$i] eq $s2[$j]) {
printDiff($i-1, $j-1);
$output[0] .= " " . $s1[$i];
$output[1] .= " " . $s1[$i];
}
else {
if ($j > 0 && ($i == 0 || $M[$i][$j-1] >= $M[$i-1][$j]
+)) {
printDiff($i, $j-1);
$output[1] .= " <" . $s2[$j] . ">";
}
elsif ($i > 0 && ($j == 0 || $M[$i][$j-1] < $M[$i-1][$
+j])) {
printDiff($i-1, $j);
$output[0] .= " [" . $s1[$i] . "]";
}
}
}
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