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|
#!perl
###############################################################################
=comment
Perl Weekly Challenge 094, Task #2: Binary Tree to Linked List
=cut
###############################################################################
#--------------------------------------#
# Copyright © 2021 PerlMonk Athanasius #
#--------------------------------------#
#==============================================================================
package ListNode;
#==============================================================================
#------------------------------------------------------------------------------
sub new # Constructor
#------------------------------------------------------------------------------
{
my ($class, $value) = @_;
my %self = ( value => $value, next => undef );
return bless \%self, $class;
}
#------------------------------------------------------------------------------
sub value # Getter only
#------------------------------------------------------------------------------
{
my ($self) = @_;
return $self->{value};
}
#------------------------------------------------------------------------------
sub next # Getter/setter
#------------------------------------------------------------------------------
{
my ($self, $new_next) = @_;
if (defined $new_next)
{
$self->{next} = $new_next;
}
return $self->{next};
}
#==============================================================================
package SinglyLinkedList;
#==============================================================================
#------------------------------------------------------------------------------
sub new # Constructor
#------------------------------------------------------------------------------
{
my ($class, $value) = @_;
my %self = ( head => undef );
if (defined $value)
{
$self{head} = ListNode->new( $value );
}
return bless \%self, $class;
}
#------------------------------------------------------------------------------
sub head # Getter/setter
#------------------------------------------------------------------------------
{
my ($self, $new_head) = @_;
if (defined $new_head)
{
$self->{head} = $new_head;
}
return $self->{head};
}
#------------------------------------------------------------------------------
sub append
#------------------------------------------------------------------------------
{
my ($self, $value) = @_;
if (defined $value && $value ne '')
{
my $new_node = ListNode->new( $value );
if (defined $self->head)
{
my $current = $self->head;
$current = $current->next while defined $current->next;
$current->next( $new_node );
}
else
{
$self->head( $new_node );
}
}
}
#------------------------------------------------------------------------------
sub display
#------------------------------------------------------------------------------
{
my ($self) = @_;
my $display;
if (defined $self->head)
{
my $first = 1;
for (my $node = $self->head; defined $node; $node = $node->next)
{
$display .= ' -> ' unless $first;
$first = 0;
$display .= $node->value;
}
}
else
{
$display = '(empty)';
}
return $display;
}
##############################################################################
1;
##############################################################################
|
