mirror of
https://github.com/pragma-/pbot.git
synced 2024-12-29 14:12:37 +01:00
136 lines
4.1 KiB
Perl
Executable File
136 lines
4.1 KiB
Perl
Executable File
#!/usr/bin/perl
|
|
#ver 2.00
|
|
|
|
use warnings;
|
|
use strict;
|
|
|
|
use Storable;
|
|
use Text::Levenshtein::XS 'distance';
|
|
|
|
die <<HELP unless @ARGV == 2;
|
|
usage: $0 <word1> <word2>
|
|
|
|
The program finds a way from one word to other, like this:
|
|
|
|
% $0 love shot
|
|
love-lose-lost-loot-soot-shot
|
|
HELP
|
|
|
|
my ($left, $right) = @ARGV[0,1];
|
|
|
|
for ($left, $right) {
|
|
$_ = lc;
|
|
}
|
|
|
|
die "the length of given words is not equal!\n" if length($left) != length $right;
|
|
|
|
my $db = -e 'wordmorph.db' ? retrieve('wordmorph.db') : die "No database available\n";
|
|
|
|
my $len = length $left;
|
|
|
|
foreach my $word ($left, $right) {
|
|
if (!$db->{$len}{$word}) {
|
|
foreach my $test (keys %{$db->{$len}}) {
|
|
if (distance($word, $test) == 1) {
|
|
push @{$db->{$len}{$word}}, $test;
|
|
push @{$db->{$len}{$test}}, $word;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
my $list = $db->{length($left)};
|
|
|
|
eval {
|
|
printway([transform($left, $right, $list)]);
|
|
1;
|
|
} or print $@;
|
|
|
|
|
|
sub transform {
|
|
my $left = shift;
|
|
my $right = shift;
|
|
my $list = shift;
|
|
|
|
my (@left, %left, @right, %right); # @left and @right- arrays containing word relation trees: ([foo], [0, foe], [0, fou], [0, 1, fie] ...)
|
|
# %left and %right - indices containing word offsets in arrays @left and @right
|
|
|
|
$left[0] = [$left];
|
|
$right[0] = [$right];
|
|
$left{$left} = 0;
|
|
$right{$right} = 0;
|
|
|
|
my $leftstart = 0;
|
|
my $rightstart = 0;
|
|
|
|
my @way;
|
|
my (%leftstarts, %rightstarts);
|
|
|
|
SEARCH:
|
|
for (;;) {
|
|
my @left_ids = $leftstart..$#left; # choose array of indices of new words
|
|
$leftstart = $#left;
|
|
die "Cannot solve! Bad word '$left' :(\n" if $leftstarts{$leftstart}++ >2; # finish search if the way could not be found
|
|
for my $id (@left_ids) { # come through all new words
|
|
my @prefix = @{$left[$id]};
|
|
my $searched = pop @prefix;
|
|
push @prefix, $id;
|
|
foreach my $word (@{$list->{$searched}}) {
|
|
next if $left{$word}; # skip words which are already in the tree
|
|
push @left, [@prefix, $word];
|
|
$left{$word} = $#left; # add new word to array and index
|
|
#print join " ", @{$left[-1]}, "\n"; #debugging
|
|
if ( defined(my $r_id = $right{$word}) ) { # and check if the word appears in right index. if yes...
|
|
my @end = reverse(print_rel($r_id, \@right));
|
|
shift @end;
|
|
@way = (print_rel($#left, \@left), @end); # build the way between the words
|
|
last SEARCH; # and finish the search
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
my @right_ids = $rightstart..$#right; # all the same :) the tree is build from both ends to speed up the process
|
|
$rightstart = $#right;
|
|
die "Cannot solve! Bad word '$right' :(\n" if $rightstarts{$rightstart}++ > 2;
|
|
for my $id (@right_ids) { # build right relational table
|
|
my @prefix = @{$right[$id]};
|
|
my $searched = pop @prefix;
|
|
push @prefix, $id;
|
|
foreach my $word (@{$list->{$searched}}) {
|
|
next if $right{$word};
|
|
push @right, [@prefix, $word];
|
|
$right{$word} = $#right;
|
|
# print join " ", @{$right[-1]}, "\n"; #debugging
|
|
if ( defined(my $l_id = $left{$word}) ) {
|
|
my @end = reverse print_rel($#right, \@right);
|
|
shift @end;
|
|
@way = (print_rel($l_id, \@left), @end);
|
|
last SEARCH;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return @way;
|
|
}
|
|
|
|
|
|
sub print_rel {
|
|
my $id = shift;
|
|
my $ary = shift;
|
|
my @line;
|
|
my @rel = @{$ary->[$id]};
|
|
push @line, (pop @rel);
|
|
|
|
foreach my $ref_id (reverse @rel) {
|
|
unshift @line, $ary->[$ref_id]->[-1];
|
|
}
|
|
return wantarray ? @line : join "\n", @line, "";
|
|
}
|
|
|
|
sub printway {
|
|
my @way = @{+shift};
|
|
print join "-", @way;
|
|
print "\n";
|
|
}
|