1 |
dpavlin |
1 |
package jsFind; |
2 |
|
|
|
3 |
|
|
use 5.008004; |
4 |
|
|
use strict; |
5 |
|
|
use warnings; |
6 |
|
|
|
7 |
|
|
our $VERSION = '0.01'; |
8 |
|
|
|
9 |
|
|
=head1 NAME |
10 |
|
|
|
11 |
|
|
jsFind - generate index for jsFind using B-Tree |
12 |
|
|
|
13 |
|
|
=head1 SYNOPSIS |
14 |
|
|
|
15 |
|
|
use jsFind; |
16 |
|
|
|
17 |
|
|
|
18 |
|
|
|
19 |
|
|
=head1 DESCRIPTION |
20 |
|
|
|
21 |
|
|
This module can be used to create index files for jsFind, powerful tool for |
22 |
|
|
adding a search engine to a CDROM archive or catalog without requiring the |
23 |
|
|
user to install anything. |
24 |
|
|
|
25 |
|
|
Main difference between this module and scripts delivered with jsFind are: |
26 |
|
|
|
27 |
|
|
=over 5 |
28 |
|
|
|
29 |
|
|
=item * |
30 |
|
|
|
31 |
|
|
You don't need to use swish-e to create index |
32 |
|
|
|
33 |
|
|
=item * |
34 |
|
|
|
35 |
|
|
You can programatically (and incrementaly) create index for jsFind |
36 |
|
|
|
37 |
|
|
=back |
38 |
|
|
|
39 |
|
|
=head1 METHODS |
40 |
|
|
|
41 |
|
|
This module contains two packages C<jsFind> and C<jsFind::Node>. |
42 |
|
|
|
43 |
|
|
=head2 jsFind methods |
44 |
|
|
|
45 |
|
|
=cut |
46 |
|
|
|
47 |
|
|
use Exporter 'import'; |
48 |
|
|
use Carp; |
49 |
|
|
|
50 |
|
|
our @ISA = qw(Exporter); |
51 |
|
|
|
52 |
|
|
BEGIN { |
53 |
|
|
import 'jsFind::Node'; |
54 |
|
|
} |
55 |
|
|
|
56 |
|
|
=head3 new |
57 |
|
|
|
58 |
|
|
Create new tree. Arguments are C<B> which is maximum numbers of keys in |
59 |
|
|
each node and optional C<Root> node. Each root node may have child nodes. |
60 |
|
|
|
61 |
|
|
All nodes are objects from C<jsFind::Node>. |
62 |
|
|
|
63 |
|
|
my $t = new jsFind(B => 4); |
64 |
|
|
|
65 |
|
|
=cut |
66 |
|
|
|
67 |
|
|
my $DEBUG = 1; |
68 |
|
|
|
69 |
|
|
sub new { |
70 |
|
|
my $package = shift; |
71 |
|
|
my %ARGV = @_; |
72 |
|
|
croak "Usage: {$package}::new(B => number [, Root => root node ])" |
73 |
|
|
unless exists $ARGV{B}; |
74 |
|
|
if ($ARGV{B} % 2) { |
75 |
|
|
my $B = $ARGV{B} + 1; |
76 |
|
|
carp "B must be an even number. Using $B instead."; |
77 |
|
|
$ARGV{B} = $B; |
78 |
|
|
} |
79 |
|
|
|
80 |
|
|
my $B = $ARGV{B}; |
81 |
|
|
my $Root = exists($ARGV{Root}) ? $ARGV{Root} : jsFind::Node->emptynode; |
82 |
|
|
bless { B => $B, Root => $Root } => $package; |
83 |
|
|
} |
84 |
|
|
|
85 |
|
|
=head3 B_search |
86 |
|
|
|
87 |
|
|
Search, insert, append or replace data in B-Tree |
88 |
|
|
|
89 |
dpavlin |
5 |
$t->B_search( |
90 |
|
|
Key => 'key value', |
91 |
|
|
Data => { "path" => { |
92 |
|
|
"t" => "title of document", |
93 |
|
|
"f" => 99, |
94 |
|
|
}, |
95 |
|
|
Insert => 1, |
96 |
|
|
Append => 1, |
97 |
|
|
); |
98 |
dpavlin |
1 |
|
99 |
|
|
Semantics: |
100 |
|
|
|
101 |
|
|
If key not found, insert it iff C<Insert> argument is present. |
102 |
|
|
|
103 |
|
|
If key B<is> found, replace existing data iff C<Replace> argument |
104 |
|
|
is present or add new datum to existing iff C<Append> argument is present. |
105 |
|
|
|
106 |
|
|
=cut |
107 |
|
|
|
108 |
|
|
sub B_search { |
109 |
|
|
my $self = shift; |
110 |
|
|
my %args = @_; |
111 |
|
|
my $cur_node = $self->root; |
112 |
|
|
my $k = $args{Key}; |
113 |
|
|
my $d = $args{Data}; |
114 |
|
|
my @path; |
115 |
|
|
|
116 |
|
|
if ($cur_node->is_empty) { # Special case for empty root |
117 |
|
|
if ($args{Insert}) { |
118 |
|
|
$cur_node->kdp_insert($k => $d); |
119 |
|
|
return $d; |
120 |
|
|
} else { |
121 |
|
|
return undef; |
122 |
|
|
} |
123 |
|
|
} |
124 |
|
|
|
125 |
|
|
# Descend tree to leaf |
126 |
|
|
for (;;) { |
127 |
|
|
|
128 |
|
|
# Didn't hit bottom yet. |
129 |
|
|
|
130 |
|
|
my($there, $where) = $cur_node->locate_key($k); |
131 |
|
|
if ($there) { # Found it! |
132 |
|
|
if ($args{Replace}) { |
133 |
|
|
$cur_node->kdp_replace($where, $k => $d); |
134 |
|
|
} elsif ($args{Append}) { |
135 |
|
|
$cur_node->kdp_append($where, $k => $d); |
136 |
|
|
} |
137 |
|
|
return $cur_node->data($where); |
138 |
|
|
} |
139 |
|
|
|
140 |
|
|
# Not here---must be in a subtree. |
141 |
|
|
|
142 |
|
|
if ($cur_node->is_leaf) { # But there are no subtrees |
143 |
|
|
return undef unless $args{Insert}; # Search failed |
144 |
|
|
# Stuff it in |
145 |
|
|
$cur_node->kdp_insert($k => $d); |
146 |
|
|
if ($self->node_overfull($cur_node)) { # Oops--there was no room. |
147 |
|
|
$self->split_and_promote($cur_node, @path); |
148 |
|
|
} |
149 |
|
|
return $d; |
150 |
|
|
} |
151 |
|
|
|
152 |
|
|
# There are subtrees, and the key is in one of them. |
153 |
|
|
|
154 |
|
|
push @path, [$cur_node, $where]; # Record path from root. |
155 |
|
|
|
156 |
|
|
# Move down to search the subtree |
157 |
|
|
$cur_node = $cur_node->subnode($where); |
158 |
|
|
|
159 |
|
|
# and start over. |
160 |
|
|
} # for (;;) ... |
161 |
|
|
|
162 |
|
|
croak ("How did I get here?"); |
163 |
|
|
} |
164 |
|
|
|
165 |
|
|
|
166 |
|
|
|
167 |
|
|
sub split_and_promote_old { |
168 |
|
|
my $self = shift; |
169 |
|
|
my ($cur_node, @path) = @_; |
170 |
|
|
|
171 |
|
|
for (;;) { |
172 |
|
|
my ($newleft, $newright, $kdp) = $cur_node->halves($self->B / 2); |
173 |
|
|
my ($up, $where) = @{pop @path}; |
174 |
|
|
if ($up) { |
175 |
|
|
$up->kdp_insert(@$kdp); |
176 |
|
|
my ($tthere, $twhere) = $up->locate_key($kdp->[0]); |
177 |
|
|
croak "Couldn't find key `$kdp->[0]' in node after just inserting it!" |
178 |
|
|
unless $tthere; |
179 |
|
|
croak "`$kdp->[0]' went into node at `$twhere' instead of expected `$where'!" |
180 |
|
|
unless $twhere == $where; |
181 |
|
|
$up->subnode($where, $newleft); |
182 |
|
|
$up->subnode($where+1, $newright); |
183 |
|
|
return unless $self->node_overfull($up); |
184 |
|
|
$cur_node = $up; |
185 |
|
|
} else { # We're at the top; make a new root. |
186 |
|
|
my $newroot = new jsFind::Node ([$kdp->[0]], |
187 |
|
|
[$kdp->[1]], |
188 |
|
|
[$newleft, $newright]); |
189 |
|
|
$self->root($newroot); |
190 |
|
|
return; |
191 |
|
|
} |
192 |
|
|
} |
193 |
|
|
|
194 |
|
|
} |
195 |
|
|
|
196 |
|
|
sub split_and_promote { |
197 |
|
|
my $self = shift; |
198 |
|
|
my ($cur_node, @path) = @_; |
199 |
|
|
|
200 |
|
|
for (;;) { |
201 |
|
|
my ($newleft, $newright, $kdp) = $cur_node->halves($self->B / 2); |
202 |
|
|
my ($up, $where) = @{pop @path} if (@path); |
203 |
|
|
if ($up) { |
204 |
|
|
$up->kdp_insert(@$kdp); |
205 |
|
|
if ($DEBUG) { |
206 |
|
|
my ($tthere, $twhere) = $up->locate_key($kdp->[0]); |
207 |
|
|
croak "Couldn't find key `$kdp->[0]' in node after just inserting it!" |
208 |
|
|
unless $tthere; |
209 |
|
|
croak "`$kdp->[0]' went into node at `$twhere' instead of expected `$where'!" |
210 |
|
|
unless $twhere == $where; |
211 |
|
|
} |
212 |
|
|
$up->subnode($where, $newleft); |
213 |
|
|
$up->subnode($where+1, $newright); |
214 |
|
|
return unless $self->node_overfull($up); |
215 |
|
|
$cur_node = $up; |
216 |
|
|
} else { # We're at the top; make a new root. |
217 |
|
|
my $newroot = new jsFind::Node([$kdp->[0]], |
218 |
|
|
[$kdp->[1]], |
219 |
|
|
[$newleft, $newright]); |
220 |
|
|
$self->root($newroot); |
221 |
|
|
return; |
222 |
|
|
} |
223 |
|
|
} |
224 |
|
|
} |
225 |
|
|
|
226 |
|
|
=head3 B |
227 |
|
|
|
228 |
|
|
Return B (maximum number of keys) |
229 |
|
|
|
230 |
|
|
my $max_size = $t->B; |
231 |
|
|
|
232 |
|
|
=cut |
233 |
|
|
|
234 |
|
|
sub B { |
235 |
|
|
$_[0]{B}; |
236 |
|
|
} |
237 |
|
|
|
238 |
|
|
=head3 root |
239 |
|
|
|
240 |
|
|
Returns root node |
241 |
|
|
|
242 |
|
|
my $root = $t->root; |
243 |
|
|
|
244 |
|
|
=cut |
245 |
|
|
|
246 |
|
|
sub root { |
247 |
|
|
my ($self, $newroot) = @_; |
248 |
|
|
$self->{Root} = $newroot if defined $newroot; |
249 |
|
|
$self->{Root}; |
250 |
|
|
} |
251 |
|
|
|
252 |
|
|
=head3 node_overfull |
253 |
|
|
|
254 |
|
|
Returns if node is overfull |
255 |
|
|
|
256 |
|
|
if ($node->node_overfull) { something } |
257 |
|
|
|
258 |
|
|
=cut |
259 |
|
|
|
260 |
|
|
sub node_overfull { |
261 |
|
|
my $self = shift; |
262 |
|
|
my $node = shift; |
263 |
|
|
$node->size > $self->B; |
264 |
|
|
} |
265 |
|
|
|
266 |
|
|
=head3 to_string |
267 |
|
|
|
268 |
|
|
Returns your tree as formatted string. |
269 |
|
|
|
270 |
|
|
my $text = $root->to_string; |
271 |
|
|
|
272 |
|
|
Mostly usefull for debugging as output leaves much to be desired. |
273 |
|
|
|
274 |
|
|
=cut |
275 |
|
|
|
276 |
|
|
sub to_string { |
277 |
|
|
$_[0]->root->to_string; |
278 |
|
|
} |
279 |
|
|
|
280 |
|
|
=head3 to_dot |
281 |
|
|
|
282 |
|
|
Create Graphviz graph of your tree |
283 |
|
|
|
284 |
|
|
my $dot_graph = $root->to_dot; |
285 |
|
|
|
286 |
|
|
=cut |
287 |
|
|
|
288 |
|
|
sub to_dot { |
289 |
|
|
my $self = shift; |
290 |
|
|
|
291 |
|
|
my $dot = qq/digraph dns {\nrankdir=LR;\n/; |
292 |
|
|
$dot .= $self->root->to_dot; |
293 |
|
|
$dot .= qq/\n}\n/; |
294 |
|
|
|
295 |
|
|
return $dot; |
296 |
|
|
} |
297 |
|
|
|
298 |
|
|
=head3 to_jsfind |
299 |
|
|
|
300 |
|
|
Create xml index files for jsFind. This should be called after |
301 |
|
|
your B-Tree has been filled with data. |
302 |
|
|
|
303 |
|
|
$root->to_jsfind('/full/path/to/index/dir/'); |
304 |
|
|
|
305 |
|
|
Returns number of nodes in created tree. |
306 |
|
|
|
307 |
|
|
=cut |
308 |
|
|
|
309 |
|
|
sub to_jsfind { |
310 |
|
|
my $self = shift; |
311 |
|
|
|
312 |
|
|
my $path = shift || confess "to_jsfind need path to your index!"; |
313 |
|
|
|
314 |
|
|
$path .= "/" if ($path =~ /\/$/); |
315 |
|
|
carp "can't create index in '$path': $!" if (! -w $path); |
316 |
|
|
|
317 |
|
|
return $self->root->to_jsfind($path,"0"); |
318 |
|
|
} |
319 |
|
|
|
320 |
|
|
|
321 |
|
|
# private, default cmd function |
322 |
|
|
sub default_cmp { |
323 |
|
|
$_[0] cmp $_[1]; |
324 |
|
|
} |
325 |
|
|
|
326 |
|
|
##################################################################### |
327 |
|
|
|
328 |
|
|
=head2 jsFind::Node methods |
329 |
|
|
|
330 |
|
|
Each node has C<k> key-data pairs, with C<B> <= C<k> <= C<2B>, and |
331 |
|
|
each has C<k+1> subnodes, which might be null. |
332 |
|
|
|
333 |
|
|
The node is a blessed reference to a list with three elements: |
334 |
|
|
|
335 |
|
|
($keylist, $datalist, $subnodelist) |
336 |
|
|
|
337 |
|
|
each is a reference to a list list. |
338 |
|
|
|
339 |
|
|
The null node is represented by a blessed reference to an empty list. |
340 |
|
|
|
341 |
|
|
=cut |
342 |
|
|
|
343 |
|
|
package jsFind::Node; |
344 |
|
|
|
345 |
|
|
use warnings; |
346 |
|
|
use strict; |
347 |
|
|
|
348 |
|
|
use Carp; |
349 |
|
|
use File::Path; |
350 |
|
|
|
351 |
|
|
my $KEYS = 0; |
352 |
|
|
my $DATA = 1; |
353 |
|
|
my $SUBNODES = 2; |
354 |
|
|
|
355 |
|
|
=head3 new |
356 |
|
|
|
357 |
|
|
Create New node |
358 |
|
|
|
359 |
|
|
my $node = new jsFind::Node ($keylist, $datalist, $subnodelist); |
360 |
|
|
|
361 |
|
|
You can also mit argument list to create empty node. |
362 |
|
|
|
363 |
|
|
my $empty_node = new jsFind::Node; |
364 |
|
|
|
365 |
|
|
=cut |
366 |
|
|
|
367 |
|
|
sub new { |
368 |
|
|
my $self = shift; |
369 |
|
|
my $package = ref $self || $self; |
370 |
|
|
croak "Internal error: jsFind::Node::new called with wrong number of arguments." |
371 |
|
|
unless @_ == 3 || @_ == 0; |
372 |
|
|
bless [@_] => $package; |
373 |
|
|
} |
374 |
|
|
|
375 |
|
|
=head3 locate_key |
376 |
|
|
|
377 |
|
|
Locate key in node using linear search. This should probably be replaced |
378 |
|
|
by binary search for better performance. |
379 |
|
|
|
380 |
|
|
my ($found, $index) = $node->locate_key($key, $cmp_coderef); |
381 |
|
|
|
382 |
|
|
Argument C<$cmp_coderef> is optional reference to custom comparison |
383 |
|
|
operator. |
384 |
|
|
|
385 |
|
|
Returns (1, $index) if $key[$index] eq $key. |
386 |
|
|
|
387 |
|
|
Returns (0, $index) if key could be found in $subnode[$index]. |
388 |
|
|
|
389 |
|
|
In scalar context, just returns 1 or 0. |
390 |
|
|
|
391 |
|
|
=cut |
392 |
|
|
|
393 |
|
|
sub locate_key { |
394 |
|
|
# Use linear search for testing, replace with binary search. |
395 |
|
|
my $self = shift; |
396 |
|
|
my $key = shift; |
397 |
|
|
my $cmp = shift || \&jsFind::default_cmp; |
398 |
|
|
my $i; |
399 |
|
|
my $cmp_result; |
400 |
|
|
my $N = $self->size; |
401 |
|
|
for ($i = 0; $i < $N; $i++) { |
402 |
|
|
$cmp_result = &$cmp($key, $self->key($i)); |
403 |
|
|
last if $cmp_result <= 0; |
404 |
|
|
} |
405 |
|
|
|
406 |
|
|
# $i is now the index of the first node-key greater than $key |
407 |
|
|
# or $N if there is no such. $cmp_result is 0 iff the key was found. |
408 |
|
|
(!$cmp_result, $i); |
409 |
|
|
} |
410 |
|
|
|
411 |
|
|
|
412 |
|
|
=head3 emptynode |
413 |
|
|
|
414 |
|
|
Creates new empty node |
415 |
|
|
|
416 |
|
|
$node = $root->emptynode; |
417 |
|
|
$new_node = $node->emptynode; |
418 |
|
|
|
419 |
|
|
=cut |
420 |
|
|
|
421 |
|
|
sub emptynode { |
422 |
|
|
new($_[0]); # Pass package name, but not anything else. |
423 |
|
|
} |
424 |
|
|
|
425 |
|
|
=head3 is_empty |
426 |
|
|
|
427 |
|
|
Test if node is empty |
428 |
|
|
|
429 |
|
|
if ($node->is_empty) { something } |
430 |
|
|
|
431 |
|
|
=cut |
432 |
|
|
|
433 |
|
|
# undef is empty; so is a blessed empty list. |
434 |
|
|
sub is_empty { |
435 |
|
|
my $self = shift; |
436 |
|
|
!defined($self) || $#$self < 0; |
437 |
|
|
} |
438 |
|
|
|
439 |
|
|
=head3 key |
440 |
|
|
|
441 |
|
|
Return C<$i>th key from node |
442 |
|
|
|
443 |
|
|
my $key = $node->key($i); |
444 |
|
|
|
445 |
|
|
=cut |
446 |
|
|
|
447 |
|
|
sub key { |
448 |
|
|
# my ($self, $n) = @_; |
449 |
|
|
# $self->[$KEYS][$n]; |
450 |
|
|
|
451 |
|
|
# speedup |
452 |
|
|
$_[0]->[$KEYS][$_[1]]; |
453 |
|
|
} |
454 |
|
|
|
455 |
|
|
=head3 data |
456 |
|
|
|
457 |
|
|
Return C<$i>th data from node |
458 |
|
|
|
459 |
|
|
my $data = $node->data($i); |
460 |
|
|
|
461 |
|
|
=cut |
462 |
|
|
|
463 |
|
|
sub data { |
464 |
|
|
my ($self, $n) = @_; |
465 |
|
|
$self->[$DATA][$n]; |
466 |
|
|
} |
467 |
|
|
|
468 |
|
|
=head3 kdp_replace |
469 |
|
|
|
470 |
|
|
Set key data pair for C<$i>th element in node |
471 |
|
|
|
472 |
|
|
$node->kdp_replace($i, "key value" => { |
473 |
|
|
"data key 1" => "data value 1", |
474 |
|
|
"data key 2" => "data value 2", |
475 |
|
|
}; |
476 |
|
|
|
477 |
|
|
=cut |
478 |
|
|
|
479 |
|
|
sub kdp_replace { |
480 |
|
|
my ($self, $n, $k => $d) = @_; |
481 |
|
|
if (defined $k) { |
482 |
|
|
$self->[$KEYS][$n] = $k; |
483 |
|
|
$self->[$DATA][$n] = $d; |
484 |
|
|
} |
485 |
|
|
[$self->[$KEYS][$n], |
486 |
|
|
$self->[$DATA][$n]]; |
487 |
|
|
} |
488 |
|
|
|
489 |
|
|
=head3 kdp_insert |
490 |
|
|
|
491 |
|
|
# No return value. |
492 |
|
|
|
493 |
|
|
=cut |
494 |
|
|
|
495 |
|
|
sub kdp_insert { |
496 |
|
|
my $self = shift; |
497 |
|
|
my ($k => $d) = @_; |
498 |
|
|
my ($there, $where) = $self->locate_key($k) unless $self->is_empty; |
499 |
|
|
|
500 |
|
|
if ($there) { croak("Tried to insert `$k => $d' into node where `$k' was already present."); } |
501 |
|
|
|
502 |
|
|
# undef fix |
503 |
|
|
$where ||= 0; |
504 |
|
|
|
505 |
|
|
splice(@{$self->[$KEYS]}, $where, 0, $k); |
506 |
|
|
splice(@{$self->[$DATA]}, $where, 0, $d); |
507 |
|
|
splice(@{$self->[$SUBNODES]}, $where, 0, undef); |
508 |
|
|
} |
509 |
|
|
|
510 |
|
|
=head3 kdp_append |
511 |
|
|
|
512 |
|
|
Adds new data keys and values to C<$i>th element in node |
513 |
|
|
|
514 |
|
|
$node->kdp_append($i, "key value" => { |
515 |
|
|
"added data key" => "added data value", |
516 |
|
|
}; |
517 |
|
|
|
518 |
|
|
=cut |
519 |
|
|
|
520 |
|
|
sub kdp_append { |
521 |
|
|
my ($self, $n, $k => $d) = @_; |
522 |
|
|
if (defined $k) { |
523 |
|
|
$self->[$KEYS][$n] = $k; |
524 |
|
|
my ($kv,$dv) = %{$d}; |
525 |
|
|
$self->[$DATA][$n]->{$kv} = $dv; |
526 |
|
|
} |
527 |
|
|
[$self->[$KEYS][$n], |
528 |
|
|
$self->[$DATA][$n]]; |
529 |
|
|
} |
530 |
|
|
|
531 |
|
|
=head3 subnode |
532 |
|
|
|
533 |
|
|
Set new or return existing subnode |
534 |
|
|
|
535 |
|
|
# return 4th subnode |
536 |
|
|
my $my_node = $node->subnode(4); |
537 |
|
|
|
538 |
|
|
# create new subnode 5 from $my_node |
539 |
|
|
$node->subnode(5, $my_node); |
540 |
|
|
|
541 |
|
|
=cut |
542 |
|
|
|
543 |
|
|
sub subnode { |
544 |
|
|
my ($self, $n, $newnode) = @_; |
545 |
|
|
$self->[$SUBNODES][$n] = $newnode if defined $newnode; |
546 |
|
|
$self->[$SUBNODES][$n]; |
547 |
|
|
} |
548 |
|
|
|
549 |
|
|
=head3 is_leaf |
550 |
|
|
|
551 |
|
|
Test if node is leaf |
552 |
|
|
|
553 |
|
|
if ($node->is_leaf) { something } |
554 |
|
|
|
555 |
|
|
=cut |
556 |
|
|
|
557 |
|
|
sub is_leaf { |
558 |
|
|
my $self = shift; |
559 |
|
|
! defined $self->[$SUBNODES][0]; # undefined subnode means leaf node. |
560 |
|
|
} |
561 |
|
|
|
562 |
|
|
=head3 size |
563 |
|
|
|
564 |
|
|
Return number of keys in the node |
565 |
|
|
|
566 |
|
|
my $nr = $node->size; |
567 |
|
|
|
568 |
|
|
=cut |
569 |
|
|
|
570 |
|
|
sub size { |
571 |
|
|
my $self = shift; |
572 |
|
|
return scalar(@{$self->[$KEYS]}); |
573 |
|
|
} |
574 |
|
|
|
575 |
|
|
=head3 halves |
576 |
|
|
|
577 |
|
|
# Accept an index $n |
578 |
|
|
# Divide into two nodes so that keys 0 .. $n-1 are in one node |
579 |
|
|
# and keys $n+1 ... $size are in the other. |
580 |
|
|
|
581 |
|
|
=cut |
582 |
|
|
|
583 |
|
|
sub halves { |
584 |
|
|
my $self = shift; |
585 |
|
|
my $n = shift; |
586 |
|
|
my $s = $self->size; |
587 |
|
|
my @right; |
588 |
|
|
my @left; |
589 |
|
|
|
590 |
|
|
$left[$KEYS] = [@{$self->[$KEYS]}[0 .. $n-1]]; |
591 |
|
|
$left[$DATA] = [@{$self->[$DATA]}[0 .. $n-1]]; |
592 |
|
|
$left[$SUBNODES] = [@{$self->[$SUBNODES]}[0 .. $n]]; |
593 |
|
|
|
594 |
|
|
$right[$KEYS] = [@{$self->[$KEYS]}[$n+1 .. $s-1]]; |
595 |
|
|
$right[$DATA] = [@{$self->[$DATA]}[$n+1 .. $s-1]]; |
596 |
|
|
$right[$SUBNODES] = [@{$self->[$SUBNODES]}[$n+1 .. $s]]; |
597 |
|
|
|
598 |
|
|
my @middle = ($self->[$KEYS][$n], $self->[$DATA][$n]); |
599 |
|
|
|
600 |
|
|
($self->new(@left), $self->new(@right), \@middle); |
601 |
|
|
} |
602 |
|
|
|
603 |
|
|
=head3 to_string |
604 |
|
|
|
605 |
|
|
Dumps tree as string |
606 |
|
|
|
607 |
|
|
my $str = $root->to_string; |
608 |
|
|
|
609 |
|
|
=cut |
610 |
|
|
|
611 |
|
|
sub to_string { |
612 |
|
|
my $self = shift; |
613 |
|
|
my $indent = shift || 0; |
614 |
|
|
my $I = ' ' x $indent; |
615 |
|
|
return '' if $self->is_empty; |
616 |
|
|
my ($k, $d, $s) = @$self; |
617 |
|
|
my $result = ''; |
618 |
|
|
$result .= defined($s->[0]) ? $s->[0]->to_string($indent+2) : ''; |
619 |
|
|
my $N = $self->size; |
620 |
|
|
my $i; |
621 |
|
|
for ($i = 0; $i < $N; $i++) { |
622 |
|
|
# $result .= $I . "$k->[$i] => $d->[$i]\n"; |
623 |
|
|
$result .= $I . "$k->[$i]\n"; |
624 |
|
|
$result .= defined($s->[$i+1]) ? $s->[$i+1]->to_string($indent+2) : ''; |
625 |
|
|
} |
626 |
|
|
$result; |
627 |
|
|
} |
628 |
|
|
|
629 |
|
|
=begin comment |
630 |
|
|
|
631 |
|
|
use Data::Dumper; |
632 |
|
|
|
633 |
|
|
sub to_string { |
634 |
|
|
my $self = shift; |
635 |
|
|
my $indent = shift || 0; |
636 |
|
|
my $path = shift || '0'; |
637 |
|
|
return '' if $self->is_empty; |
638 |
|
|
my ($k, $d, $s) = @$self; |
639 |
|
|
my $result = ''; |
640 |
|
|
$result .= defined($s->[0]) ? $s->[0]->to_string($indent+1,"$path/0") : ''; |
641 |
|
|
my $N = $self->size; |
642 |
|
|
for (my $i = 0; $i < $N; $i++) { |
643 |
|
|
my $dump = Dumper($d->[$i]); |
644 |
|
|
$dump =~ s/[\n\r\s]+/ /gs; |
645 |
|
|
$dump =~ s/\$VAR1\s*=\s*//; |
646 |
|
|
$result .= sprintf("%-5s [%2d] %2s: %s => %s\n", $path, $i, $indent, $k->[$i], $dump); |
647 |
|
|
$result .= defined($s->[$i+1]) ? $s->[$i+1]->to_string($indent+1,"$path/$i") : ''; |
648 |
|
|
} |
649 |
|
|
$result; |
650 |
|
|
} |
651 |
|
|
|
652 |
|
|
=end comment |
653 |
|
|
|
654 |
|
|
=head3 to_dot |
655 |
|
|
|
656 |
|
|
Recursivly walk nodes of tree |
657 |
|
|
|
658 |
|
|
=cut |
659 |
|
|
|
660 |
|
|
sub to_dot { |
661 |
|
|
my $self = shift; |
662 |
|
|
my $parent = shift; |
663 |
|
|
|
664 |
|
|
return '' if $self->is_empty; |
665 |
|
|
|
666 |
|
|
my $dot = ''; |
667 |
|
|
|
668 |
|
|
my ($k, $d, $s) = @$self; |
669 |
|
|
my $N = $self->size; |
670 |
|
|
|
671 |
|
|
my @dot_keys; |
672 |
|
|
|
673 |
|
|
my $node_name = $parent || '_'; |
674 |
|
|
$node_name =~ s/\W+//g; |
675 |
|
|
$node_name .= " [$N]"; |
676 |
|
|
|
677 |
|
|
for (my $i = 0; $i <= $N; $i++) { |
678 |
|
|
if (my $key = $k->[$i]) { |
679 |
|
|
push @dot_keys, qq{<$i>$key}; |
680 |
|
|
} |
681 |
|
|
$dot .= $s->[$i]->to_dot(qq{"$node_name":$i}) if ($s->[$i]); |
682 |
|
|
} |
683 |
|
|
push @dot_keys, qq{<$N>...} if (! $self->is_leaf); |
684 |
|
|
|
685 |
|
|
my $label = join("|",@dot_keys); |
686 |
|
|
$dot .= qq{"$node_name" [ shape=record, label="$label" ];\n}; |
687 |
|
|
|
688 |
|
|
$dot .= qq{$parent -> "$node_name";\n} if ($parent); |
689 |
|
|
|
690 |
|
|
$dot; |
691 |
|
|
} |
692 |
|
|
|
693 |
|
|
=head3 to_jsfind |
694 |
|
|
|
695 |
|
|
Create jsFind xml files |
696 |
|
|
|
697 |
|
|
my $nr=$tree->to_dot('/path/to/index','0'); |
698 |
|
|
|
699 |
|
|
Returns number of elements created |
700 |
|
|
|
701 |
|
|
=cut |
702 |
|
|
|
703 |
|
|
sub to_jsfind { |
704 |
|
|
my $self = shift; |
705 |
|
|
my ($path,$file) = @_; |
706 |
|
|
|
707 |
|
|
return 0 if $self->is_empty; |
708 |
|
|
|
709 |
|
|
my $nr_keys = 0; |
710 |
|
|
|
711 |
|
|
my ($k, $d, $s) = @$self; |
712 |
|
|
my $N = $self->size; |
713 |
|
|
|
714 |
|
|
my ($key_xml, $data_xml) = ("<n>","<d>"); |
715 |
|
|
|
716 |
|
|
for (my $i = 0; $i <= $N; $i++) { |
717 |
|
|
my $key = lc($k->[$i]); |
718 |
|
|
|
719 |
|
|
if ($key) { |
720 |
|
|
$key_xml .= qq{<k>$key</k>}; |
721 |
|
|
$data_xml .= qq{<e>}; |
722 |
|
|
#use Data::Dumper; |
723 |
|
|
#print Dumper($d->[$i]); |
724 |
|
|
foreach my $path (keys %{$d->[$i]}) { |
725 |
|
|
$data_xml .= '<l f="'.($d->[$i]->{$path}->{'f'} || 1).'" t="'.($d->[$i]->{$path}->{'t'} || 'no title').'">'.$path.'</l>'; |
726 |
|
|
$nr_keys++; |
727 |
|
|
} |
728 |
|
|
$data_xml .= qq{</e>}; |
729 |
|
|
} |
730 |
|
|
|
731 |
|
|
$nr_keys += $s->[$i]->to_jsfind("$path/$file","$i") if ($s->[$i]); |
732 |
|
|
} |
733 |
|
|
|
734 |
|
|
$key_xml .= "</n>"; |
735 |
|
|
$data_xml .= "</d>"; |
736 |
|
|
|
737 |
|
|
if (! -e $path) { |
738 |
|
|
mkpath($path) || croak "can't create dir '$path': $!"; |
739 |
|
|
} |
740 |
|
|
|
741 |
|
|
open(K, "> ${path}/${file}.xml") || croak "can't open '$path/$file.xml': $!"; |
742 |
|
|
open(D, "> ${path}/_${file}.xml") || croak "can't open '$path/_$file.xml': $!"; |
743 |
|
|
|
744 |
|
|
print K $key_xml; |
745 |
|
|
print D $data_xml; |
746 |
|
|
|
747 |
|
|
close(K); |
748 |
|
|
close(D); |
749 |
|
|
|
750 |
|
|
return $nr_keys; |
751 |
|
|
} |
752 |
|
|
|
753 |
|
|
1; |
754 |
|
|
__END__ |
755 |
|
|
|
756 |
|
|
=head1 SEE ALSO |
757 |
|
|
|
758 |
|
|
jsFind web site L<http://www.elucidsoft.net/projects/jsfind/> |
759 |
|
|
|
760 |
|
|
B-Trees in perl web site L<http://perl.plover.com/BTree/> |
761 |
|
|
|
762 |
|
|
=head1 AUTHORS |
763 |
|
|
|
764 |
|
|
Mark-Jonson Dominus E<lt>mjd@pobox.comE<gt> wrote C<BTree.pm> which was |
765 |
|
|
base for this module |
766 |
|
|
|
767 |
|
|
Shawn P. Garbett E<lt>shawn@elucidsoft.netE<gt> wrote jsFind |
768 |
|
|
|
769 |
|
|
Dobrica Pavlinusic E<lt>dpavlin@rot13.orgE<gt> wrote this module |
770 |
|
|
|
771 |
|
|
=head1 COPYRIGHT AND LICENSE |
772 |
|
|
|
773 |
|
|
Copyright (C) 2004 by Dobrica Pavlinusic |
774 |
|
|
|
775 |
|
|
This program is free software; you can redistribute it and/or modify it |
776 |
|
|
under the terms of the GNU General Public License as published by the Free |
777 |
|
|
Software Foundation; either version 2 of the License, or (at your option) |
778 |
|
|
any later version. This program is distributed in the hope that it will be |
779 |
|
|
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of |
780 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
781 |
|
|
Public License for more details. |
782 |
|
|
|
783 |
|
|
=cut |