my $length = $options->{length } || 4;
my $pages = $options->{pages } || 1 + int $#$self / $pagesize;
- $pagesize = @$self / $pages;
- my $offset = $pagesize + .5;
- my $shrunk = 0;
- my $enlarged = 0;
+ $pagesize = $pages >= $#$self ? 1 : @$self / $pages;
+ my $lookbehind = -$context;
+ my $lookahead = $context;
+
my @links = ('');
- while ($offset < @$self) {
+ for (my $offset = $pagesize + .5; $offset < @$self; $offset += $pagesize) {
my $link = substr $self->[$offset], 0, $length;
if ($context) {
my $penalty = 0;
# take a value slightly before the current offset
- if ((my $before = $offset - $context + $shrunk) > 0) {
+ if ((my $before = $offset + $lookbehind) > 0) {
# see how much of it matches the current link
my $trim = 1;
for my $match (split //, $self->[$before - 1]) {
}
}
- $shrunk = 0;
+ $lookbehind = -$context;
+
# take a value after the current offset
- if ((my $after = $offset + $context - $enlarged) < $#$self) {
+ if ((my $after = $offset + $lookahead) < $#$self) {
# see how much of it matches the current link
my $trim = 1;
for my $match (split //, $self->[$after]) {
$link = substr $self->[$after], 0, $trim;
# advance lookbehind offset on the next page
$penalty = 0;
- for ($offset .. $#$self) {
- last if $self->[$offset + $shrunk] =~ /^\Q$link/;
- $shrunk++;
+ for ($offset .. $after) {
+ last if $self->[$_] =~ /^\Q$link/;
+ $lookbehind++;
}
}
}
- $enlarged = $penalty;
+
+ $lookahead = $context - $penalty;
}
- push @links, $link;
- $offset += $pagesize;
+ push @links, $link unless $links[-1] eq $link;
}
- use List::MoreUtils 'uniq';
- @links = uniq @links;
for my $i (0 .. $#links - 1) {
my ($link, $lastchar) = $links[$i + 1] =~ /(.*)(.)/;
$link .= $lastchar le 'a' ? '.' : chr( ord($lastchar) - 1 );