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<?php |
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namespace DD; |
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/** |
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* DiMaria Dependency injector |
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*/ |
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class DiMaria |
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{ |
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protected $preferences = []; |
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protected $aliases = []; |
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protected $cache = []; |
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protected $injections = []; |
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protected $params = []; |
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protected $shared = []; |
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protected $sharedInstance = []; |
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/** |
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* Set multiple di rules at once. |
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* @param array $rules a multi-dimensional array of rules to set |
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* @return self |
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*/ |
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public function setRules(array $rules): self |
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{ |
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$rules['preferences'] = $rules['preferences'] ?? []; |
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$rules['aliases'] = $rules['aliases'] ?? []; |
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$rules['params'] = $rules['params'] ?? []; |
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$rules['shared'] = $rules['shared'] ?? []; |
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$rules['injections'] = $rules['injections'] ?? []; |
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foreach ($rules['preferences'] as $interface => $class) { |
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$this->setPreference($interface, $class); |
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} |
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foreach ($rules['aliases'] as $alias => $aliasConfig) { |
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$this->setAlias($alias, ...$aliasConfig); |
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}; |
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foreach ($rules['params'] as $instance => $params) { |
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$this->setParams($instance, $params); |
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} |
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foreach ($rules['shared'] as $instance => $isShared) { |
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if ($isShared) { |
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$this->setShared($instance); |
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} |
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}; |
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foreach ($rules['injections'] as $instance => $config) { |
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foreach ($config as $params) { |
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$this->setInjection($instance, ...$params); |
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} |
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} |
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return $this; |
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} |
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/** |
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* Set a preferred implementation of a class/interface |
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* @param string $alias the name of the alias |
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* @param string $className the name of the class/interface |
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* @return self |
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*/ |
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public function setPreference(string $alias, string $className): self |
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{ |
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$this->preferences[$alias] = $className; |
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return $this; |
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} |
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/** |
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* Alias a class/interface/alias to a string. |
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* @param string $alias the name of the alias |
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* @param string $className the name of the class |
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* @param array $params a key/value array of parameter names and values |
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* @return self |
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*/ |
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public function setAlias(string $alias, string $className, array $params = []): self |
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{ |
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$this->aliases[$alias] = [ |
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'className' => $className, |
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'params' => $params |
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]; |
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return $this; |
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} |
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/** |
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* Set rule to call a method after constructing a class |
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* @param string $className the name of the class |
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* @param string $method the name of the method |
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* @param array $params a key/value array of parameter names and values |
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* @return self |
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*/ |
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public function setInjection(string $className, string $method, array $params = []): self |
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{ |
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$this->injections[$className][$method][] = $params; |
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return $this; |
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} |
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/** |
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* Set parameters of a class |
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* @param string $className the name of the class |
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* @param array $params a key/value array of parameter names and values |
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* @return self |
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*/ |
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public function setParams(string $className, array $params): self |
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{ |
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$this->params[$className] = $params + ($this->params[$className] ?? []); |
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return $this; |
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} |
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/** |
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* Mark a class/alias as shared |
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* @param string $className the name of class/alias |
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* @return self |
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*/ |
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public function setShared(string $className): self |
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{ |
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$this->shared[$className] = true; |
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return $this; |
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} |
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/** |
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* Get an instance of a class |
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* @param string $className the name of class/alias to create |
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* @param array $params a key/value array of parameter names and values |
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* @return mixed an instance of the class requested |
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*/ |
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public function get(string $className, array $params = []) |
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{ |
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if (isset($this->shared[$className]) && isset($this->sharedInstance[$className])) { |
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return $this->sharedInstance[$className]; |
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} |
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while ($preference = $this->preferences[$className] ?? false) { |
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$className = $preference; |
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} |
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$originalClassName = $className; |
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while ($alias = $this->aliases[$className] ?? false) { |
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$params = $params + $alias['params']; |
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$className = $alias['className']; |
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} |
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$callback = $this->cache[$originalClassName] ?? $this->getCallback($className, $originalClassName); |
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$object = $callback($params); |
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if (isset($this->shared[$originalClassName])) { |
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$this->sharedInstance[$originalClassName] = $object; |
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} |
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return $object; |
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} |
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protected function getCallback(string $className, string $originalClassName): callable |
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{ |
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$callback = $this->generateCallback($className); |
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if (isset($this->injections[$originalClassName])) { |
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foreach ($this->injections[$originalClassName] as $method => $instance) { |
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$methodInfo = $this->getMethodInfo(new \ReflectionMethod($className, $method)); |
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foreach ($instance as $methodParameters) { |
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$methodParams = $this->getParameters($methodInfo, $methodParameters); |
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$callback = function ($params) use ($callback, $method, $methodParams) { |
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$object = $callback($params); |
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$object->$method(...$methodParams); |
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return $object; |
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}; |
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}; |
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} |
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} |
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$this->cache[$originalClassName] = $callback; |
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return $callback; |
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} |
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protected function generateCallback(string $className): callable |
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{ |
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$constructor = (new \ReflectionClass($className))->getConstructor(); |
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if (! $constructor || ! $constructor->getNumberOfParameters()) { |
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return function () use ($className) { |
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return new $className; |
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}; |
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} |
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$constructorInfo = $this->getMethodInfo($constructor); |
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$predefinedParams = $this->params[$className] ?? []; |
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return function ($params) use ($className, $constructorInfo, $predefinedParams) { |
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return new $className(...$this->getParameters($constructorInfo, $params + $predefinedParams)); |
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}; |
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} |
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protected function getMethodInfo(\ReflectionMethod $method): array |
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{ |
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$paramInfo = []; |
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foreach ($method->getParameters() as $param) { |
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$paramType = $param->hasType() ? $param->getType() : null; |
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$paramType = $paramType ? $paramType->isBuiltin() ? null : $paramType->__toString() : null; |
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$paramInfo[$param->name] = [ |
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'name' => $param->name, |
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'optional' => $param->isOptional(), |
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'default' => $param->isOptional() ? ($param->isVariadic() ? null : $param->getDefaultValue()) : null, |
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'variadic' => $param->isVariadic(), |
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'type' => $paramType, |
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]; |
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} |
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return $paramInfo; |
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} |
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protected function getParameters(array $methodInfo, array $params): array |
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{ |
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$parameters = []; |
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foreach ($methodInfo as $param) { |
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if (isset($params[$param['name']])) { |
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array_push($parameters, ...$this->determineParameter($params[$param['name']], $param['variadic'])); |
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} elseif ($param['optional']) { |
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if ($param['variadic']) { |
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break; |
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} |
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$parameters[] = $param['default']; |
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} elseif ($param['type']) { |
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$parameters[] = $this->get($param['type']); |
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} else { |
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throw new \Exception('Required parameter $' . $param['name'] . ' is missing'); |
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} |
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} |
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return $parameters; |
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} |
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protected function determineParameter($param, bool $isVariadic): array |
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{ |
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if (is_array($param)) { |
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if ($isVariadic) { |
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$params = []; |
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foreach ($param as $a) { |
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$params[] = isset($a['instanceOf']) ? $this->get($a['instanceOf']) : $a; |
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} |
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return $params; |
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} |
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return isset($param['instanceOf']) ? [$this->get($param['instanceOf'])] : [$param]; |
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} |
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return [$param]; |
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} |
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} |
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dangerousdan /
DiMaria
