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test modulo
[perl/list-index.git]
/
lib
/
List
/
Index.pm
diff --git
a/lib/List/Index.pm
b/lib/List/Index.pm
index 5b46313d7272168dea172ddf5135ce9ef480dae0..4ce9c25b8dacb38693302421c1f2692220ed669d 100644
(file)
--- a/
lib/List/Index.pm
+++ b/
lib/List/Index.pm
@@
-24,37
+24,52
@@
sub ranges {
$pagesize = @$self / $pages;
my $offset = $pagesize + .5;
$pagesize = @$self / $pages;
my $offset = $pagesize + .5;
+ my $shrunk = 0;
+ my $enlarged = 0;
my @links = ('');
while ($offset < @$self) {
my $link = substr $self->[$offset], 0, $length;
if ($context) {
my @links = ('');
while ($offset < @$self) {
my $link = substr $self->[$offset], 0, $length;
if ($context) {
- {
-
# take a value slightly before the current offset
- my $before = $offset > $context ? $self->[$offset - $context] : '.';
+ my $penalty = 0;
+ # take a value slightly before the current offset
+ if ((my $before = $offset - $context + $shrunk) > 0) {
# see how much of it matches the current link
my $trim = 1;
# see how much of it matches the current link
my $trim = 1;
- for my $match (split //, $
before
) {
+ for my $match (split //, $
self->[$before - 1]
) {
scalar $link =~ /\G\Q$match/g or last;
$trim++;
}
# truncate link upto where the earlier value starts to differ
scalar $link =~ /\G\Q$match/g or last;
$trim++;
}
# truncate link upto where the earlier value starts to differ
- substr($link, $trim) = '' unless $trim > length $link;
+ if ($trim < length $link) {
+ substr($link, $trim) = '';
+ for (reverse $before .. $offset) {
+ $self->[$offset - $penalty] =~ /^\Q$link/ or last;
+ $penalty++;
+ }
+ }
}
}
- if ($offset + $context < $#$self) {
-
# take a value after the current offset
- my $after = $self->[$offset + $context];
+ $shrunk = 0;
+ # take a value after the current offset
+ if ((my $after = $offset + $context - $enlarged) < $#$self) {
# see how much of it matches the current link
my $trim = 1;
# see how much of it matches the current link
my $trim = 1;
- for my $match (split //, $
after
) {
+ for my $match (split //, $
self->[$after]
) {
scalar $link =~ /\G\Q$match/g or last;
$trim++;
}
# use this link if it's shorter
if ($trim < length $link) {
scalar $link =~ /\G\Q$match/g or last;
$trim++;
}
# use this link if it's shorter
if ($trim < length $link) {
- $link = substr $after, 0, $trim;
+ $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++;
+ }
}
}
}
}
+ $enlarged = $penalty;
}
push @links, $link;
}
push @links, $link;