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