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Showing differences between two sequences

by merlyn (Sage)
on Sep 15, 2000 at 22:58 UTC ( [id://32718]=CUFP: print w/replies, xml ) Need Help??

Use Algorithm::Diff to show the differences as color-coded HTML between two text sequences.
use Algorithm::Diff qw(traverse_sequences); my ($old, $new) = split /\n--\n/, join "", <DATA>; # get strings $_ = [split /\s+/, $_] for ($old, $new); # turn them into arrayrefs traverse_sequences($old, $new, { MATCH => sub { print "$old->[shift]\n"}, DISCARD_A => sub { print "<font color=red>$old->[shift]</font>\n"}, DISCARD_B => sub { print "<font color=green>$new->[shift,shift]</fon +t>\n"}, }); __END__ We start. Let's begin. This is the old text. Then we end. -- We start. This is the new text. And here's some stuff I added. Then w +e end.
which produces:
We start. <font color=red>Let's</font> <font color=red>begin.</font> This is the <font color=red>old</font> <font color=green>new</font> text. <font color=green>And</font> <font color=green>here's</font> <font color=green>some</font> <font color=green>stuff</font> <font color=green>I</font> <font color=green>added.</font> Then we end.
which results in:
We start. Let's begin. This is the old new text. And here's some stuff I added. Then we end.

Replies are listed 'Best First'.
Beware Web Colors!
by chromatic (Archbishop) on Mar 03, 2002 at 18:17 UTC
    Sorry to raise the dead here, but one thing bears repeating. Since a large percentage (25%) of men are red-green colorblind, it's better to pick two highly different colors. I have to read the original and the modified lines to figure out what's changed -- both "change" colors look nearly the same to me.

    Update: I confused the incidence statistic with the inheritance probability. Read a good description of genetics and recessive traits to find out what I was thinking.

      While I agree that colorblindness is important (particularly for you), you are overstating the incidence rates by a factor of 3.

      A good description of the design problem and solutions may be found here.

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