is_deeply($index->ranges({pagesize => 300}), [qw(-c d-n o-)], 'large pagesize');
};
+subtest 'context' => sub {
+ plan tests => 9;
+ my $index = List::Index->new([qw(
+ kkeg kl km kmlu knsy koxb kpeo kuaa kuab kuac
+ kuapa kuq kur kux kzb lc lg lgu lgua lguc
+ lguq lgur lgus lgx lka lkq lks lln llq llx
+ )]) or return;
+ is_deeply(
+ $index->ranges({ pagesize=>10, context=>0, length=>5 }),
+ # ranges should match offsets exactly
+ [qw(-kuap. kuapa-lgup lguq-)],
+ 'no context'
+ );
+ is_deeply(
+ $index->ranges({ pagesize=>10, context=>0 }),
+ # default length limits to 4 chars
+ [qw(-kuao kuap-lgup lguq-)],
+ 'default length'
+ );
+ is_deeply(
+ $index->ranges({ pagesize=>10, context=>1 }),
+ # lookbehinds aren't shorter (kuac<kuap, lguc<lguq)
+ # 'kuap' can advance to 'kuq'
+ [qw(-kup kuq-lgup lguq-)],
+ 'lookahead'
+ );
+TODO: {
+ local $TODO = 'backtrack';
+ is_deeply(
+ $index->ranges({ pagesize=>10, context=>2 }),
+ # allowed to advance to 'kur', but provides no benefits over 'kuq'
+ [qw(-kup kuq-lgup lguq-)],
+ 'minimal lookahead'
+ );
+}
+ is_deeply(
+ $index->ranges({ pagesize=>10, context=>3 }),
+ # shorten 'kuap' to 'ku' because lookbehind is 'kp...'
+ # 'lguq' matches 'lg', but may only backtrack to 'lgu'
+ [qw(-kt ku-lgt lgu-)],
+ 'lookbehind'
+ );
+ is_deeply(
+ $index->ranges({ pagesize=>10, context=>4 }),
+ [qw(-kt ku-lf lg-)],
+ 'maximal lookahead'
+ );
+ is_deeply(
+ $index->ranges({ pagesize=>10, context=>5 }),
+ # after forwarding 'kuap' to 'lc'
+ # disallow backtracking of 'lguq' to 'lc' to prevent qw[-k l-]
+ # so only lookahead (to 'lkq') remains
+ [qw(-k l-lj lk-)],
+ 'no lookbehind after full lookahead'
+ );
+ is_deeply(
+ $index->ranges({ pagesize=>10, context=>9 }),
+ # allow a single (10-9) entry (l-lf = lc) to remain
+ [qw(-k l-lf lg-)],
+ 'lookbehind after full lookahead'
+ );
+ is_deeply(
+ $index->ranges({ pagesize=>10, context=>10 }),
+ # allow the last page to go back upto 'lc', replacing the 2nd page
+ [qw(-k l-)],
+ 'full overlap'
+ );
+};
+
subtest 'context' => sub {
plan tests => 4;
my $index = List::Index->new([qw(
#pp($index->ranges({pagesize => 2, context => 2, length => 1}));
};
-subtest 'distribution' => sub {
- plan tests => 2;
- my $index = List::Index->new([qw(
- kkeg kl km kmlu knsy koxb kpeo kuaa kuab kuac
- kuap kuaq kuq kux kzb lc lg lgu lgua lguc
- lguq lgur lgus lgx lka lkq lks lln llq llx
- )]) or return;
-TODO: {
- local $TODO = 'under development';
- is_deeply(
- $index->ranges({ pagesize=>10, context=>3 }),
- # shorten 'kuap' to 'ku' because lookbehind is 'kp...'
- # 'lguq' matches 'lg', but may only backtrack to 'lgu'
- [qw(-kt ku-lgt lgu-)],
- 'lookbehind'
- );
-}
- is_deeply(
- $index->ranges({ pagesize=>10, context=>4 }),
- [qw(-kt ku-lf lg-)],
- 'maximal lookahead'
- );
-}
-