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package jsFind; |
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|
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use 5.008004; |
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use strict; |
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use warnings; |
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|
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our $VERSION = '0.01'; |
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|
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=head1 NAME |
10 |
|
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jsFind - generate index for jsFind using B-Tree |
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|
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=head1 SYNOPSIS |
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|
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use jsFind; |
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|
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|
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|
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=head1 DESCRIPTION |
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|
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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 |
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user to install anything. |
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|
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Main difference between this module and scripts delivered with jsFind are: |
26 |
|
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=over 5 |
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|
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=item * |
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|
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You don't need to use swish-e to create index |
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|
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=item * |
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|
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You can programatically (and incrementaly) create index for jsFind |
36 |
|
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=back |
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|
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=head1 METHODS |
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|
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This module contains two packages C<jsFind> and C<jsFind::Node>. |
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|
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=head2 jsFind methods |
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|
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=cut |
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|
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use Exporter 'import'; |
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use Carp; |
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|
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our @ISA = qw(Exporter); |
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|
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BEGIN { |
53 |
import 'jsFind::Node'; |
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} |
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|
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=head3 new |
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|
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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. |
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|
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All nodes are objects from C<jsFind::Node>. |
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|
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my $t = new jsFind(B => 4); |
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|
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=cut |
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|
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my $DEBUG = 1; |
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|
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sub new { |
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my $package = shift; |
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my %ARGV = @_; |
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croak "Usage: {$package}::new(B => number [, Root => root node ])" |
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unless exists $ARGV{B}; |
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if ($ARGV{B} % 2) { |
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my $B = $ARGV{B} + 1; |
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carp "B must be an even number. Using $B instead."; |
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$ARGV{B} = $B; |
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} |
79 |
|
80 |
my $B = $ARGV{B}; |
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my $Root = exists($ARGV{Root}) ? $ARGV{Root} : jsFind::Node->emptynode; |
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bless { B => $B, Root => $Root } => $package; |
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} |
84 |
|
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=head3 B_search |
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|
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Search, insert, append or replace data in B-Tree |
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|
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|
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|
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Semantics: |
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|
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If key not found, insert it iff C<Insert> argument is present. |
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|
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If key B<is> found, replace existing data iff C<Replace> argument |
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is present or add new datum to existing iff C<Append> argument is present. |
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|
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=cut |
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|
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sub B_search { |
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my $self = shift; |
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my %args = @_; |
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my $cur_node = $self->root; |
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my $k = $args{Key}; |
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my $d = $args{Data}; |
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my @path; |
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|
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if ($cur_node->is_empty) { # Special case for empty root |
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if ($args{Insert}) { |
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$cur_node->kdp_insert($k => $d); |
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return $d; |
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} else { |
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return undef; |
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} |
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} |
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|
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# Descend tree to leaf |
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for (;;) { |
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|
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# Didn't hit bottom yet. |
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|
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my($there, $where) = $cur_node->locate_key($k); |
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if ($there) { # Found it! |
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if ($args{Replace}) { |
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$cur_node->kdp_replace($where, $k => $d); |
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} elsif ($args{Append}) { |
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$cur_node->kdp_append($where, $k => $d); |
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} |
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return $cur_node->data($where); |
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} |
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|
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# Not here---must be in a subtree. |
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|
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if ($cur_node->is_leaf) { # But there are no subtrees |
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return undef unless $args{Insert}; # Search failed |
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# Stuff it in |
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$cur_node->kdp_insert($k => $d); |
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if ($self->node_overfull($cur_node)) { # Oops--there was no room. |
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$self->split_and_promote($cur_node, @path); |
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} |
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return $d; |
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} |
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|
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# There are subtrees, and the key is in one of them. |
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|
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push @path, [$cur_node, $where]; # Record path from root. |
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|
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# Move down to search the subtree |
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$cur_node = $cur_node->subnode($where); |
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|
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# and start over. |
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} # for (;;) ... |
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|
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croak ("How did I get here?"); |
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} |
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|
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|
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|
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sub split_and_promote_old { |
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my $self = shift; |
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my ($cur_node, @path) = @_; |
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|
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for (;;) { |
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my ($newleft, $newright, $kdp) = $cur_node->halves($self->B / 2); |
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my ($up, $where) = @{pop @path}; |
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if ($up) { |
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$up->kdp_insert(@$kdp); |
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my ($tthere, $twhere) = $up->locate_key($kdp->[0]); |
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croak "Couldn't find key `$kdp->[0]' in node after just inserting it!" |
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unless $tthere; |
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croak "`$kdp->[0]' went into node at `$twhere' instead of expected `$where'!" |
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unless $twhere == $where; |
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$up->subnode($where, $newleft); |
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$up->subnode($where+1, $newright); |
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return unless $self->node_overfull($up); |
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$cur_node = $up; |
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} else { # We're at the top; make a new root. |
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my $newroot = new jsFind::Node ([$kdp->[0]], |
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[$kdp->[1]], |
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[$newleft, $newright]); |
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$self->root($newroot); |
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return; |
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} |
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} |
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|
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} |
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|
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sub split_and_promote { |
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my $self = shift; |
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my ($cur_node, @path) = @_; |
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|
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for (;;) { |
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my ($newleft, $newright, $kdp) = $cur_node->halves($self->B / 2); |
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my ($up, $where) = @{pop @path} if (@path); |
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if ($up) { |
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$up->kdp_insert(@$kdp); |
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if ($DEBUG) { |
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my ($tthere, $twhere) = $up->locate_key($kdp->[0]); |
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croak "Couldn't find key `$kdp->[0]' in node after just inserting it!" |
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unless $tthere; |
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croak "`$kdp->[0]' went into node at `$twhere' instead of expected `$where'!" |
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unless $twhere == $where; |
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} |
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$up->subnode($where, $newleft); |
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$up->subnode($where+1, $newright); |
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return unless $self->node_overfull($up); |
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$cur_node = $up; |
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} else { # We're at the top; make a new root. |
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my $newroot = new jsFind::Node([$kdp->[0]], |
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[$kdp->[1]], |
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[$newleft, $newright]); |
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$self->root($newroot); |
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return; |
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} |
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} |
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} |
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|
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=head3 B |
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|
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Return B (maximum number of keys) |
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|
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my $max_size = $t->B; |
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|
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=cut |
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|
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sub B { |
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$_[0]{B}; |
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} |
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|
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=head3 root |
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|
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Returns root node |
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|
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my $root = $t->root; |
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|
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=cut |
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|
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sub root { |
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my ($self, $newroot) = @_; |
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$self->{Root} = $newroot if defined $newroot; |
241 |
$self->{Root}; |
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} |
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|
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=head3 node_overfull |
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|
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Returns if node is overfull |
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|
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if ($node->node_overfull) { something } |
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|
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=cut |
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|
252 |
sub node_overfull { |
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my $self = shift; |
254 |
my $node = shift; |
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$node->size > $self->B; |
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} |
257 |
|
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=head3 to_string |
259 |
|
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Returns your tree as formatted string. |
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|
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my $text = $root->to_string; |
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|
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Mostly usefull for debugging as output leaves much to be desired. |
265 |
|
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=cut |
267 |
|
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sub to_string { |
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$_[0]->root->to_string; |
270 |
} |
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|
272 |
=head3 to_dot |
273 |
|
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Create Graphviz graph of your tree |
275 |
|
276 |
my $dot_graph = $root->to_dot; |
277 |
|
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=cut |
279 |
|
280 |
sub to_dot { |
281 |
my $self = shift; |
282 |
|
283 |
my $dot = qq/digraph dns {\nrankdir=LR;\n/; |
284 |
$dot .= $self->root->to_dot; |
285 |
$dot .= qq/\n}\n/; |
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|
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return $dot; |
288 |
} |
289 |
|
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=head3 to_jsfind |
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|
292 |
Create xml index files for jsFind. This should be called after |
293 |
your B-Tree has been filled with data. |
294 |
|
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$root->to_jsfind('/full/path/to/index/dir/'); |
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|
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Returns number of nodes in created tree. |
298 |
|
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=cut |
300 |
|
301 |
sub to_jsfind { |
302 |
my $self = shift; |
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|
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my $path = shift || confess "to_jsfind need path to your index!"; |
305 |
|
306 |
$path .= "/" if ($path =~ /\/$/); |
307 |
carp "can't create index in '$path': $!" if (! -w $path); |
308 |
|
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return $self->root->to_jsfind($path,"0"); |
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} |
311 |
|
312 |
|
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# private, default cmd function |
314 |
sub default_cmp { |
315 |
$_[0] cmp $_[1]; |
316 |
} |
317 |
|
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##################################################################### |
319 |
|
320 |
=head2 jsFind::Node methods |
321 |
|
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Each node has C<k> key-data pairs, with C<B> <= C<k> <= C<2B>, and |
323 |
each has C<k+1> subnodes, which might be null. |
324 |
|
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The node is a blessed reference to a list with three elements: |
326 |
|
327 |
($keylist, $datalist, $subnodelist) |
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|
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each is a reference to a list list. |
330 |
|
331 |
The null node is represented by a blessed reference to an empty list. |
332 |
|
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=cut |
334 |
|
335 |
package jsFind::Node; |
336 |
|
337 |
use warnings; |
338 |
use strict; |
339 |
|
340 |
use Carp; |
341 |
use File::Path; |
342 |
|
343 |
my $KEYS = 0; |
344 |
my $DATA = 1; |
345 |
my $SUBNODES = 2; |
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|
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=head3 new |
348 |
|
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Create New node |
350 |
|
351 |
my $node = new jsFind::Node ($keylist, $datalist, $subnodelist); |
352 |
|
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You can also mit argument list to create empty node. |
354 |
|
355 |
my $empty_node = new jsFind::Node; |
356 |
|
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=cut |
358 |
|
359 |
sub new { |
360 |
my $self = shift; |
361 |
my $package = ref $self || $self; |
362 |
croak "Internal error: jsFind::Node::new called with wrong number of arguments." |
363 |
unless @_ == 3 || @_ == 0; |
364 |
bless [@_] => $package; |
365 |
} |
366 |
|
367 |
=head3 locate_key |
368 |
|
369 |
Locate key in node using linear search. This should probably be replaced |
370 |
by binary search for better performance. |
371 |
|
372 |
my ($found, $index) = $node->locate_key($key, $cmp_coderef); |
373 |
|
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Argument C<$cmp_coderef> is optional reference to custom comparison |
375 |
operator. |
376 |
|
377 |
Returns (1, $index) if $key[$index] eq $key. |
378 |
|
379 |
Returns (0, $index) if key could be found in $subnode[$index]. |
380 |
|
381 |
In scalar context, just returns 1 or 0. |
382 |
|
383 |
=cut |
384 |
|
385 |
sub locate_key { |
386 |
# Use linear search for testing, replace with binary search. |
387 |
my $self = shift; |
388 |
my $key = shift; |
389 |
my $cmp = shift || \&jsFind::default_cmp; |
390 |
my $i; |
391 |
my $cmp_result; |
392 |
my $N = $self->size; |
393 |
for ($i = 0; $i < $N; $i++) { |
394 |
$cmp_result = &$cmp($key, $self->key($i)); |
395 |
last if $cmp_result <= 0; |
396 |
} |
397 |
|
398 |
# $i is now the index of the first node-key greater than $key |
399 |
# or $N if there is no such. $cmp_result is 0 iff the key was found. |
400 |
(!$cmp_result, $i); |
401 |
} |
402 |
|
403 |
|
404 |
=head3 emptynode |
405 |
|
406 |
Creates new empty node |
407 |
|
408 |
$node = $root->emptynode; |
409 |
$new_node = $node->emptynode; |
410 |
|
411 |
=cut |
412 |
|
413 |
sub emptynode { |
414 |
new($_[0]); # Pass package name, but not anything else. |
415 |
} |
416 |
|
417 |
=head3 is_empty |
418 |
|
419 |
Test if node is empty |
420 |
|
421 |
if ($node->is_empty) { something } |
422 |
|
423 |
=cut |
424 |
|
425 |
# undef is empty; so is a blessed empty list. |
426 |
sub is_empty { |
427 |
my $self = shift; |
428 |
!defined($self) || $#$self < 0; |
429 |
} |
430 |
|
431 |
=head3 key |
432 |
|
433 |
Return C<$i>th key from node |
434 |
|
435 |
my $key = $node->key($i); |
436 |
|
437 |
=cut |
438 |
|
439 |
sub key { |
440 |
# my ($self, $n) = @_; |
441 |
# $self->[$KEYS][$n]; |
442 |
|
443 |
# speedup |
444 |
$_[0]->[$KEYS][$_[1]]; |
445 |
} |
446 |
|
447 |
=head3 data |
448 |
|
449 |
Return C<$i>th data from node |
450 |
|
451 |
my $data = $node->data($i); |
452 |
|
453 |
=cut |
454 |
|
455 |
sub data { |
456 |
my ($self, $n) = @_; |
457 |
$self->[$DATA][$n]; |
458 |
} |
459 |
|
460 |
=head3 kdp_replace |
461 |
|
462 |
Set key data pair for C<$i>th element in node |
463 |
|
464 |
$node->kdp_replace($i, "key value" => { |
465 |
"data key 1" => "data value 1", |
466 |
"data key 2" => "data value 2", |
467 |
}; |
468 |
|
469 |
=cut |
470 |
|
471 |
sub kdp_replace { |
472 |
my ($self, $n, $k => $d) = @_; |
473 |
if (defined $k) { |
474 |
$self->[$KEYS][$n] = $k; |
475 |
$self->[$DATA][$n] = $d; |
476 |
} |
477 |
[$self->[$KEYS][$n], |
478 |
$self->[$DATA][$n]]; |
479 |
} |
480 |
|
481 |
=head3 kdp_insert |
482 |
|
483 |
# No return value. |
484 |
|
485 |
=cut |
486 |
|
487 |
sub kdp_insert { |
488 |
my $self = shift; |
489 |
my ($k => $d) = @_; |
490 |
my ($there, $where) = $self->locate_key($k) unless $self->is_empty; |
491 |
|
492 |
if ($there) { croak("Tried to insert `$k => $d' into node where `$k' was already present."); } |
493 |
|
494 |
# undef fix |
495 |
$where ||= 0; |
496 |
|
497 |
splice(@{$self->[$KEYS]}, $where, 0, $k); |
498 |
splice(@{$self->[$DATA]}, $where, 0, $d); |
499 |
splice(@{$self->[$SUBNODES]}, $where, 0, undef); |
500 |
} |
501 |
|
502 |
=head3 kdp_append |
503 |
|
504 |
Adds new data keys and values to C<$i>th element in node |
505 |
|
506 |
$node->kdp_append($i, "key value" => { |
507 |
"added data key" => "added data value", |
508 |
}; |
509 |
|
510 |
=cut |
511 |
|
512 |
sub kdp_append { |
513 |
my ($self, $n, $k => $d) = @_; |
514 |
if (defined $k) { |
515 |
$self->[$KEYS][$n] = $k; |
516 |
my ($kv,$dv) = %{$d}; |
517 |
$self->[$DATA][$n]->{$kv} = $dv; |
518 |
} |
519 |
[$self->[$KEYS][$n], |
520 |
$self->[$DATA][$n]]; |
521 |
} |
522 |
|
523 |
=head3 subnode |
524 |
|
525 |
Set new or return existing subnode |
526 |
|
527 |
# return 4th subnode |
528 |
my $my_node = $node->subnode(4); |
529 |
|
530 |
# create new subnode 5 from $my_node |
531 |
$node->subnode(5, $my_node); |
532 |
|
533 |
=cut |
534 |
|
535 |
sub subnode { |
536 |
my ($self, $n, $newnode) = @_; |
537 |
$self->[$SUBNODES][$n] = $newnode if defined $newnode; |
538 |
$self->[$SUBNODES][$n]; |
539 |
} |
540 |
|
541 |
=head3 is_leaf |
542 |
|
543 |
Test if node is leaf |
544 |
|
545 |
if ($node->is_leaf) { something } |
546 |
|
547 |
=cut |
548 |
|
549 |
sub is_leaf { |
550 |
my $self = shift; |
551 |
! defined $self->[$SUBNODES][0]; # undefined subnode means leaf node. |
552 |
} |
553 |
|
554 |
=head3 size |
555 |
|
556 |
Return number of keys in the node |
557 |
|
558 |
my $nr = $node->size; |
559 |
|
560 |
=cut |
561 |
|
562 |
sub size { |
563 |
my $self = shift; |
564 |
return scalar(@{$self->[$KEYS]}); |
565 |
} |
566 |
|
567 |
=head3 halves |
568 |
|
569 |
# Accept an index $n |
570 |
# Divide into two nodes so that keys 0 .. $n-1 are in one node |
571 |
# and keys $n+1 ... $size are in the other. |
572 |
|
573 |
=cut |
574 |
|
575 |
sub halves { |
576 |
my $self = shift; |
577 |
my $n = shift; |
578 |
my $s = $self->size; |
579 |
my @right; |
580 |
my @left; |
581 |
|
582 |
$left[$KEYS] = [@{$self->[$KEYS]}[0 .. $n-1]]; |
583 |
$left[$DATA] = [@{$self->[$DATA]}[0 .. $n-1]]; |
584 |
$left[$SUBNODES] = [@{$self->[$SUBNODES]}[0 .. $n]]; |
585 |
|
586 |
$right[$KEYS] = [@{$self->[$KEYS]}[$n+1 .. $s-1]]; |
587 |
$right[$DATA] = [@{$self->[$DATA]}[$n+1 .. $s-1]]; |
588 |
$right[$SUBNODES] = [@{$self->[$SUBNODES]}[$n+1 .. $s]]; |
589 |
|
590 |
my @middle = ($self->[$KEYS][$n], $self->[$DATA][$n]); |
591 |
|
592 |
($self->new(@left), $self->new(@right), \@middle); |
593 |
} |
594 |
|
595 |
=head3 to_string |
596 |
|
597 |
Dumps tree as string |
598 |
|
599 |
my $str = $root->to_string; |
600 |
|
601 |
=cut |
602 |
|
603 |
sub to_string { |
604 |
my $self = shift; |
605 |
my $indent = shift || 0; |
606 |
my $I = ' ' x $indent; |
607 |
return '' if $self->is_empty; |
608 |
my ($k, $d, $s) = @$self; |
609 |
my $result = ''; |
610 |
$result .= defined($s->[0]) ? $s->[0]->to_string($indent+2) : ''; |
611 |
my $N = $self->size; |
612 |
my $i; |
613 |
for ($i = 0; $i < $N; $i++) { |
614 |
# $result .= $I . "$k->[$i] => $d->[$i]\n"; |
615 |
$result .= $I . "$k->[$i]\n"; |
616 |
$result .= defined($s->[$i+1]) ? $s->[$i+1]->to_string($indent+2) : ''; |
617 |
} |
618 |
$result; |
619 |
} |
620 |
|
621 |
=begin comment |
622 |
|
623 |
use Data::Dumper; |
624 |
|
625 |
sub to_string { |
626 |
my $self = shift; |
627 |
my $indent = shift || 0; |
628 |
my $path = shift || '0'; |
629 |
return '' if $self->is_empty; |
630 |
my ($k, $d, $s) = @$self; |
631 |
my $result = ''; |
632 |
$result .= defined($s->[0]) ? $s->[0]->to_string($indent+1,"$path/0") : ''; |
633 |
my $N = $self->size; |
634 |
for (my $i = 0; $i < $N; $i++) { |
635 |
my $dump = Dumper($d->[$i]); |
636 |
$dump =~ s/[\n\r\s]+/ /gs; |
637 |
$dump =~ s/\$VAR1\s*=\s*//; |
638 |
$result .= sprintf("%-5s [%2d] %2s: %s => %s\n", $path, $i, $indent, $k->[$i], $dump); |
639 |
$result .= defined($s->[$i+1]) ? $s->[$i+1]->to_string($indent+1,"$path/$i") : ''; |
640 |
} |
641 |
$result; |
642 |
} |
643 |
|
644 |
=end comment |
645 |
|
646 |
=head3 to_dot |
647 |
|
648 |
Recursivly walk nodes of tree |
649 |
|
650 |
=cut |
651 |
|
652 |
sub to_dot { |
653 |
my $self = shift; |
654 |
my $parent = shift; |
655 |
|
656 |
return '' if $self->is_empty; |
657 |
|
658 |
my $dot = ''; |
659 |
|
660 |
my ($k, $d, $s) = @$self; |
661 |
my $N = $self->size; |
662 |
|
663 |
my @dot_keys; |
664 |
|
665 |
my $node_name = $parent || '_'; |
666 |
$node_name =~ s/\W+//g; |
667 |
$node_name .= " [$N]"; |
668 |
|
669 |
for (my $i = 0; $i <= $N; $i++) { |
670 |
if (my $key = $k->[$i]) { |
671 |
push @dot_keys, qq{<$i>$key}; |
672 |
} |
673 |
$dot .= $s->[$i]->to_dot(qq{"$node_name":$i}) if ($s->[$i]); |
674 |
} |
675 |
push @dot_keys, qq{<$N>...} if (! $self->is_leaf); |
676 |
|
677 |
my $label = join("|",@dot_keys); |
678 |
$dot .= qq{"$node_name" [ shape=record, label="$label" ];\n}; |
679 |
|
680 |
$dot .= qq{$parent -> "$node_name";\n} if ($parent); |
681 |
|
682 |
$dot; |
683 |
} |
684 |
|
685 |
=head3 to_jsfind |
686 |
|
687 |
Create jsFind xml files |
688 |
|
689 |
my $nr=$tree->to_dot('/path/to/index','0'); |
690 |
|
691 |
Returns number of elements created |
692 |
|
693 |
=cut |
694 |
|
695 |
sub to_jsfind { |
696 |
my $self = shift; |
697 |
my ($path,$file) = @_; |
698 |
|
699 |
return 0 if $self->is_empty; |
700 |
|
701 |
my $nr_keys = 0; |
702 |
|
703 |
my ($k, $d, $s) = @$self; |
704 |
my $N = $self->size; |
705 |
|
706 |
my ($key_xml, $data_xml) = ("<n>","<d>"); |
707 |
|
708 |
for (my $i = 0; $i <= $N; $i++) { |
709 |
my $key = lc($k->[$i]); |
710 |
|
711 |
if ($key) { |
712 |
$key_xml .= qq{<k>$key</k>}; |
713 |
$data_xml .= qq{<e>}; |
714 |
#use Data::Dumper; |
715 |
#print Dumper($d->[$i]); |
716 |
foreach my $path (keys %{$d->[$i]}) { |
717 |
$data_xml .= '<l f="'.($d->[$i]->{$path}->{'f'} || 1).'" t="'.($d->[$i]->{$path}->{'t'} || 'no title').'">'.$path.'</l>'; |
718 |
$nr_keys++; |
719 |
} |
720 |
$data_xml .= qq{</e>}; |
721 |
} |
722 |
|
723 |
$nr_keys += $s->[$i]->to_jsfind("$path/$file","$i") if ($s->[$i]); |
724 |
} |
725 |
|
726 |
$key_xml .= "</n>"; |
727 |
$data_xml .= "</d>"; |
728 |
|
729 |
if (! -e $path) { |
730 |
mkpath($path) || croak "can't create dir '$path': $!"; |
731 |
} |
732 |
|
733 |
open(K, "> ${path}/${file}.xml") || croak "can't open '$path/$file.xml': $!"; |
734 |
open(D, "> ${path}/_${file}.xml") || croak "can't open '$path/_$file.xml': $!"; |
735 |
|
736 |
print K $key_xml; |
737 |
print D $data_xml; |
738 |
|
739 |
close(K); |
740 |
close(D); |
741 |
|
742 |
return $nr_keys; |
743 |
} |
744 |
|
745 |
1; |
746 |
__END__ |
747 |
|
748 |
=head1 SEE ALSO |
749 |
|
750 |
jsFind web site L<http://www.elucidsoft.net/projects/jsfind/> |
751 |
|
752 |
B-Trees in perl web site L<http://perl.plover.com/BTree/> |
753 |
|
754 |
=head1 AUTHORS |
755 |
|
756 |
Mark-Jonson Dominus E<lt>mjd@pobox.comE<gt> wrote C<BTree.pm> which was |
757 |
base for this module |
758 |
|
759 |
Shawn P. Garbett E<lt>shawn@elucidsoft.netE<gt> wrote jsFind |
760 |
|
761 |
Dobrica Pavlinusic E<lt>dpavlin@rot13.orgE<gt> wrote this module |
762 |
|
763 |
=head1 COPYRIGHT AND LICENSE |
764 |
|
765 |
Copyright (C) 2004 by Dobrica Pavlinusic |
766 |
|
767 |
This program is free software; you can redistribute it and/or modify it |
768 |
under the terms of the GNU General Public License as published by the Free |
769 |
Software Foundation; either version 2 of the License, or (at your option) |
770 |
any later version. This program is distributed in the hope that it will be |
771 |
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of |
772 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
773 |
Public License for more details. |
774 |
|
775 |
=cut |