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| #!/usr/bin/env perl
use v5.36;
use Moo;
package VendingMachineState {
use Moo::Role;
requires 'insert_coin';
requires 'select_product';
requires 'dispense';
}
package WaitingState {
use Moo;
use v5.36;
with 'VendingMachineState';
sub insert_coin ($self, $context) {
say "コインを受け付けました";
$context->set_state(CoinInsertedState->new);
}
sub select_product ($self, $context) {
say "先にコインを入れてください";
}
sub dispense ($self, $context) {
say "払い出す商品がありません";
}
}
package CoinInsertedState {
use Moo;
use v5.36;
with 'VendingMachineState';
sub insert_coin ($self, $context) {
say "すでにコインが入っています";
}
sub select_product ($self, $context) {
if ($context->stock > 0) {
say "商品を選択しました。払い出しを開始します";
$context->set_state(DispensingState->new);
}
else {
say "申し訳ありません。売り切れです";
say "コインを返却します";
$context->set_state(SoldOutState->new);
}
}
sub dispense ($self, $context) {
say "先に商品を選択してください";
}
}
package DispensingState {
use Moo;
use v5.36;
with 'VendingMachineState';
sub insert_coin ($self, $context) {
say "払い出し中です。お待ちください";
}
sub select_product ($self, $context) {
say "払い出し中です。お待ちください";
}
sub dispense ($self, $context) {
say "商品を払い出しました";
$context->stock($context->stock - 1);
say "残り在庫: " . $context->stock . "個";
if ($context->stock > 0) {
$context->set_state(WaitingState->new);
}
else {
say "在庫がなくなりました";
$context->set_state(SoldOutState->new);
}
}
}
package SoldOutState {
use Moo;
use v5.36;
with 'VendingMachineState';
sub insert_coin ($self, $context) {
say "売り切れです。コインを受け付けられません";
}
sub select_product ($self, $context) {
say "売り切れです";
}
sub dispense ($self, $context) {
say "売り切れです。払い出せません";
}
}
package VendingMachine {
use Moo;
use v5.36;
has state => (
is => 'rw',
default => sub { WaitingState->new },
isa => sub { # 型チェック追加
my $value = shift;
die "state must do VendingMachineState role"
unless $value->does('VendingMachineState');
},
);
has stock => (
is => 'rw',
default => sub { 5 },
);
sub set_state ($self, $new_state) {
$self->state($new_state);
}
sub insert_coin ($self) {
$self->state->insert_coin($self);
}
sub select_product ($self) {
$self->state->select_product($self);
}
sub dispense ($self) {
$self->state->dispense($self);
}
sub current_state_name ($self) {
my $name = ref($self->state);
my %ja_names = (
WaitingState => '待機中',
CoinInsertedState => 'コイン投入済み',
DispensingState => '払い出し中',
SoldOutState => '売り切れ',
);
return $ja_names{$name} // $name;
}
}
# 対話的CLI
sub run_cli ($vm) {
say "=== 自動販売機シミュレーター ===";
say "コマンド: c(コイン投入), s(商品選択), d(払い出し), q(終了)";
say "";
while (1) {
print "現在の状態: " . $vm->current_state_name;
print " / 在庫: " . $vm->stock . "個";
print "\n> ";
my $input = <STDIN>;
last unless defined $input;
chomp $input;
if ($input eq 'c') {
$vm->insert_coin;
}
elsif ($input eq 's') {
$vm->select_product;
}
elsif ($input eq 'd') {
$vm->dispense;
}
elsif ($input eq 'q') {
say "終了します";
last;
}
elsif ($input eq '') {
next;
}
else {
say "不明なコマンドです: $input";
}
say "";
}
}
# メイン
my $vm = VendingMachine->new(stock => 3);
run_cli($vm);
|
