/
Game.pm
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Game.pm
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use Event;
module Hanoi {
class DiskMoved does Event {
has $.disk;
has $.source;
has $.target;
}
class AchievementUnlocked does Event {
}
class AchievementLocked does Event {
}
class DiskRemoved does Event {
has $.disk;
has $.source;
}
class DiskAdded does Event {
has $.disk;
has $.target;
}
our sub print_hanoi_game(@all_events) {
my @disks = <tiny small medium large huge> X~ ' disk';
my @rods = <left middle right>;
my %s =
left => [reverse @disks],
middle => [],
right => [],
;
for @all_events {
when Hanoi::DiskMoved { %s{.target}.push: %s{.source}.pop }
when Hanoi::DiskRemoved { %s{.source}.pop }
when Hanoi::DiskAdded { %s{.target}.push: .disk }
}
say "";
for reverse ^6 -> $line {
my %disks =
'none' => ' | ',
'tiny disk' => ' = ',
'small disk' => ' === ',
'medium disk' => ' ===== ',
'large disk' => ' ======= ',
'huge disk' => ' ========= ',
;
sub disk($rod) {
my $disk = %s{$rod}[$line] // 'none';
%disks{ $disk };
}
say join ' ', map &disk, @rods;
}
say join '--', '-----------' xx @rods;
}
}
class X::Hanoi is Exception {
class LargerOnSmaller is X::Hanoi {
has $.larger;
has $.smaller;
method message {
"Cannot put the $.larger on the $.smaller"
}
}
class NoSuchRod is X::Hanoi {
has $.rod;
has $.name;
method message {
"No such $.rod rod '$.name'"
}
}
class RodHasNoDisks is X::Hanoi {
has $.name;
method message {
"Cannot move from the $.name rod because there is no disk there"
}
}
class CoveredDisk is X::Hanoi {
has $.disk;
has @.covered_by;
method message {
sub last_and(@things) {
map { "{'and ' if $_ == @things.end}@things[$_]" }, ^@things
}
my $disklist = @.covered_by > 1
?? join ', ', last_and map { "the $_" }, @.covered_by
!! "the @.covered_by[0]";
"Cannot move the $.disk: it is covered by $disklist"
}
}
class ForbiddenDiskRemoval is X::Hanoi {
has $.disk;
method message {
"Removing the $.disk is forbidden"
}
}
class DiskHasBeenRemoved is X::Hanoi {
has $.disk;
has $.action;
method message {
"Cannot $.action the $.disk because it has been removed"
}
}
class NoSuchDisk is X::Hanoi {
has $.disk;
has $.action;
method message {
"Cannot $.action a $.disk because there is no such disk"
}
}
class DiskAlreadyOnARod is X::Hanoi {
has $.disk;
method message {
"Cannot add the $.disk because it is already on a rod"
}
}
}
class Hanoi::Game {
my @disks = <tiny small medium large huge> X~ ' disk';
my %size_of = @disks Z 1..5;
has %!state =
left => [reverse @disks],
middle => [],
right => [],
;
has $!achievement = 'locked';
method move($source is copy, $target) {
if $source eq any @disks {
$source = self!rod_with_disk($source, 'move');
}
die X::Hanoi::NoSuchRod.new(:rod<source>, :name($source))
unless %!state.exists($source);
die X::Hanoi::NoSuchRod.new(:rod<target>, :name($target))
unless %!state.exists($target);
my @source_rod := %!state{$source};
die X::Hanoi::RodHasNoDisks.new(:name($source))
unless @source_rod;
my @target_rod := %!state{$target};
my $moved_disk = @source_rod[*-1];
if @target_rod {
my $covered_disk = @target_rod[*-1];
if %size_of{$moved_disk} > %size_of{$covered_disk} {
die X::Hanoi::LargerOnSmaller.new(
:larger($moved_disk),
:smaller($covered_disk)
);
}
}
my @events
= Hanoi::DiskMoved.new(:disk($moved_disk), :$source, :$target);
if %!state<right> == @disks-1
&& $target eq 'right'
&& $!achievement eq 'locked' {
@events.push(Hanoi::AchievementUnlocked.new);
}
if $moved_disk eq 'small disk' && $!achievement eq 'unlocked' {
@events.push(Hanoi::AchievementLocked.new);
}
self!apply_and_return: @events;
}
method remove($disk) {
die X::Hanoi::NoSuchDisk.new(:action<remove>, :$disk)
unless $disk eq any(@disks);
my $source = self!rod_with_disk($disk, 'remove');
die X::Hanoi::ForbiddenDiskRemoval.new(:$disk)
unless $disk eq 'tiny disk';
my @events = Hanoi::DiskRemoved.new(:$disk, :$source);
self!apply_and_return: @events;
}
method add($disk, $target) {
die X::Hanoi::NoSuchDisk.new(:action<add>, :$disk)
unless $disk eq any(@disks);
die X::Hanoi::NoSuchRod.new(:rod<target>, :name($target))
unless %!state.exists($target);
die X::Hanoi::DiskAlreadyOnARod.new(:$disk)
if grep { $disk eq any(@$_) }, %!state.values;
my @events = Hanoi::DiskAdded.new(:$disk, :$target);
if %!state<right> == @disks-1
&& $target eq 'right'
&& $!achievement eq 'locked' {
@events.push(Hanoi::AchievementUnlocked.new);
}
self!apply_and_return: @events;
}
# The method will throw X::Hanoi::CoveredDisk if the disk is not topmost,
# or X::Hanoi::DiskHasBeenRemoved if the disk isn't found on any rod.
method !rod_with_disk($disk, $action) {
for %!state -> (:key($rod), :value(@disks)) {
if $disk eq any(@disks) {
sub smaller_disks {
grep { %size_of{$_} < %size_of{$disk} }, @disks;
}
die X::Hanoi::CoveredDisk.new(:$disk, :covered_by(smaller_disks))
unless @disks[*-1] eq $disk;
return $rod;
}
}
die X::Hanoi::DiskHasBeenRemoved.new(:$disk, :$action);
}
method !apply_and_return(@events) {
self!apply($_) for @events;
return @events;
}
# RAKUDO: private multimethods NYI
method !apply(Event $_) {
when Hanoi::DiskMoved {
my @source_rod := %!state{.source};
my @target_rod := %!state{.target};
@target_rod.push( @source_rod.pop );
}
when Hanoi::AchievementUnlocked {
$!achievement = 'unlocked';
}
when Hanoi::AchievementLocked {
$!achievement = 'locked';
}
when Hanoi::DiskRemoved {
my @source_rod := %!state{.source};
@source_rod.pop;
}
when Hanoi::DiskAdded {
my @target_rod := %!state{.target};
@target_rod.push(.disk);
}
}
}
sub CLI {
my Hanoi::Game $game .= new;
sub params($method) {
$method.signature.params
==> grep { .positional && !.invocant }
==> map { .name.substr(1) }
}
my %commands = map { $^m.name => params($m) }, $game.^methods;
my @all_events;
Hanoi::print_hanoi_game(@all_events);
say "";
loop {
my $command = prompt('> ');
unless defined $command {
say "";
last;
}
given lc $command {
when 'q' | 'quit' { last }
when 'h' | 'help' {
say "Goal: get all the disks to the right rod.";
say "You can never place a larger disk on a smaller one.";
say "Available commands:";
for %commands.sort {
say " {.key} {map { "<$_>" }, .value.list}";
}
say " q[uit]";
say " h[elp]";
say " s[how]";
say "";
my @disks = <tiny small medium large huge> X~ ' disk';
my @rods = <left middle right>;
say "Disks: ", join ', ', @disks;
say "Rods: ", join ', ', @rods;
}
when 's' | 'show' { Hanoi::print_hanoi_game(@all_events) }
sub munge { $^s.subst(/' disk'»/, '_disk', :g) }
sub unmunge { $^s.subst(/'_disk'»/, ' disk', :g) }
my $verb = .&munge.words[0].&unmunge;
my @args = .&munge.words[1..*]».&unmunge;
when %commands.exists($verb) {
my @req_args = %commands{$verb}.list;
when @args != @req_args {
say "You passed in {+@args} arguments, but $verb requires {+@req_args}.";
say "The arguments are {map { "<$_>" }, @req_args}.";
say "'help' for more help.";
}
my @events = $game."$verb"(|@args);
push @all_events, @events;
Hanoi::print_hanoi_game(@all_events);
for @events {
when Hanoi::AchievementUnlocked { say "Achievement unlocked!" }
when Hanoi::AchievementLocked { say "Achievement locked!" }
}
CATCH {
when X::Hanoi { say .message, '.' }
}
}
default {
say "Sorry, the game doesn't recognize that command. :/";
say "'help' if you're confused as well.";
}
}
say "";
}
}