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| #!/usr/bin/env perl
use v5.36;
package Command {
use Moo::Role;
requires 'execute';
has actor => (
is => 'ro',
required => 1,
);
has target => (
is => 'ro',
required => 0,
);
}
package Character {
use Moo;
has name => (
is => 'ro',
required => 1,
);
has hp => (
is => 'rw',
default => 100,
);
has max_hp => (
is => 'ro',
default => 100,
);
has attack_power => (
is => 'ro',
default => 10,
);
has is_defending => (
is => 'rw',
default => 0,
);
sub is_alive($self) {
return $self->hp > 0;
}
sub take_damage($self, $damage) {
my $actual_damage = $self->is_defending ? int($damage / 2) : $damage;
my $new_hp = $self->hp - $actual_damage;
$self->hp($new_hp < 0 ? 0 : $new_hp);
$self->is_defending(0);
return $actual_damage;
}
}
package AttackCommand {
use Moo;
with 'Command';
sub execute($self) {
my $actor = $self->actor;
my $target = $self->target;
my $damage = $actor->attack_power;
my $actual = $target->take_damage($damage);
my $msg = $actor->name . "の攻撃！ " . $target->name . "に " . $actual . " のダメージ！";
$msg .= "（防御で軽減）" if $actual < $damage;
say $msg;
}
}
package BattleState {
use Moo::Role;
requires 'enter';
requires 'execute';
requires 'exit';
}
package BattleContext {
use Moo;
has player => (
is => 'ro',
required => 1,
);
has enemy => (
is => 'ro',
required => 1,
);
has current_state => (
is => 'rw',
default => sub { undef },
);
has is_finished => (
is => 'rw',
default => 0,
);
sub change_state($self, $new_state) {
$self->current_state->exit($self) if $self->current_state;
$self->current_state($new_state);
$new_state->enter($self);
}
sub update($self) {
return if $self->is_finished;
$self->current_state->execute($self) if $self->current_state;
}
}
package BattleStartState {
use Moo;
with 'BattleState';
sub enter($self, $context) {
say "=== 戦闘開始！ ===";
say $context->enemy->name . "が現れた！";
}
sub execute($self, $context) {
say "";
say $context->player->name . " HP: " . $context->player->hp;
say $context->enemy->name . " HP: " . $context->enemy->hp;
say "";
$context->change_state(PlayerTurnState->new());
}
sub exit($self, $context) {}
}
package PlayerTurnState {
use Moo;
with 'BattleState';
sub enter($self, $context) {
say "--- " . $context->player->name . "のターン ---";
}
sub execute($self, $context) {
my $command = AttackCommand->new(
actor => $context->player,
target => $context->enemy,
);
$command->execute();
unless ($context->enemy->is_alive) {
$context->change_state(BattleEndState->new(winner => 'player'));
return;
}
$context->change_state(EnemyTurnState->new());
}
sub exit($self, $context) {}
}
package EnemyTurnState {
use Moo;
with 'BattleState';
sub enter($self, $context) {
say "";
say "--- " . $context->enemy->name . "のターン ---";
}
sub execute($self, $context) {
my $command = AttackCommand->new(
actor => $context->enemy,
target => $context->player,
);
$command->execute();
unless ($context->player->is_alive) {
$context->change_state(BattleEndState->new(winner => 'enemy'));
return;
}
$context->change_state(PlayerTurnState->new());
}
sub exit($self, $context) {}
}
package BattleEndState {
use Moo;
with 'BattleState';
has winner => (
is => 'ro',
required => 1,
);
sub enter($self, $context) {
say "";
say "=== 戦闘終了！ ===";
}
sub execute($self, $context) {
if ($self->winner eq 'player') {
say $context->enemy->name . "を倒した！";
} else {
say $context->player->name . "は倒れた...";
}
$context->is_finished(1);
}
sub exit($self, $context) {}
}
# メイン処理
my $hero = Character->new(
name => '勇者',
hp => 100,
attack_power => 15,
);
my $slime = Character->new(
name => 'スライム',
hp => 30,
attack_power => 5,
);
my $battle = BattleContext->new(
player => $hero,
enemy => $slime,
);
$battle->change_state(BattleStartState->new());
while (!$battle->is_finished) {
$battle->update();
}
|
