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<?php |
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declare(strict_types=1); |
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namespace HeroesofAbenez\Chat; |
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/** |
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* ChatCommandsProcessor |
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* |
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* @author Jakub Konečný |
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*/ |
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final class ChatCommandsProcessor implements ChatMessageProcessor |
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{ |
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/** @var IChatCommand[] */ |
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private array $commands = []; |
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/** |
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* Add new command |
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* |
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* @throws CommandNameAlreadyUsedException |
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*/ |
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public function addCommand(IChatCommand $command): void |
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{ |
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$name = $command->getName(); |
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if ($this->hasCommand($name)) { |
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throw new CommandNameAlreadyUsedException("Command $name is already defined."); |
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} |
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$this->commands[] = $command; |
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} |
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/** |
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* Add an alias for already defined command |
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* |
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* @throws CommandNotFoundException |
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* @throws CommandNameAlreadyUsedException |
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*/ |
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public function addAlias(string $oldName, string $newName): void |
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{ |
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$command = $this->getCommand($oldName); |
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$new = clone $command; |
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$new->setName($newName); |
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$this->addCommand($new); |
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} |
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/** |
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* Extract command from text |
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*/ |
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public function extractCommand(string $text): string |
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{ |
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if (!str_starts_with($text, "/")) { |
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return ""; |
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} |
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if (!str_contains($text, " ")) { |
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$command = substr($text, 1); |
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} else { |
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$parts = explode(" ", substr($text, 1)); |
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$command = $parts[0]; |
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} |
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if ($this->hasCommand($command)) { |
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return $command; |
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} |
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return ""; |
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} |
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/** |
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* Extract parameters from text |
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*/ |
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public function extractParameters(string $text): array |
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{ |
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if (!str_starts_with($text, "/") || !str_contains($text, " ")) { |
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return []; |
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} |
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$params = explode(" ", $text); |
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unset($params[0]); |
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return $params; |
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} |
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/** |
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* Check whether a command is defined |
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*/ |
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public function hasCommand(string $name): bool |
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{ |
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foreach ($this->commands as $command) { |
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if ($command->getName() === $name) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Get command's definition |
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* |
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* @throws CommandNotFoundException |
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*/ |
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public function getCommand(string $name): IChatCommand |
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{ |
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foreach ($this->commands as $command) { |
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if ($command->getName() === $name) { |
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return $command; |
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} |
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} |
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throw new CommandNotFoundException("Command $name is not defined."); |
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} |
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public function parse(string $message): ?string |
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{ |
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$commandName = $this->extractCommand($message); |
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if ($commandName === "") { |
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return null; |
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} |
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$command = $this->getCommand($commandName); |
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$params = $this->extractParameters($message); |
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return call_user_func_array([$command, "execute"], $params); |
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} |
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} |
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heroesofabenez /
chat
