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| 1 | <?php |
| 2 | |
| 3 | namespace Dynart\Micro; |
| 4 | |
| 5 | use ReflectionClass; |
| 6 | use ReflectionException; |
| 7 | |
| 8 | /** |
| 9 | * Micro PHP Dependency Injection |
| 10 | */ |
| 11 | class Micro { |
| 12 | |
| 13 | /** Holds the instance of the application */ |
| 14 | protected static ?AbstractApp $app = null; |
| 15 | |
| 16 | /** Stores the classes in [interface => class] format, the class can be null */ |
| 17 | protected static array $classes = []; |
| 18 | |
| 19 | /** Stores the instances in [interface => instance] format */ |
| 20 | protected static array $instances = []; |
| 21 | |
| 22 | /** |
| 23 | * Sets the application instance and runs it |
| 24 | * |
| 25 | * First it sets the instance, then calls the `fullInit()` and `fullProcess()` methods of the `$app`. |
| 26 | * |
| 27 | * @throws MicroException if the instance was set before |
| 28 | */ |
| 29 | public static function run(AbstractApp $app): void { |
| 30 | if (self::$app) { |
| 31 | throw new MicroException("App was instantiated before!"); |
| 32 | } |
| 33 | self::$app = $app; |
| 34 | $app->fullInit(); |
| 35 | $app->fullProcess(); |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * Returns the instance of the application |
| 40 | */ |
| 41 | public static function app(): ?AbstractApp { |
| 42 | return self::$app; |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * Adds a class for an interface |
| 47 | * |
| 48 | * For example: |
| 49 | * |
| 50 | * <pre> |
| 51 | * Micro::add(ConfigInterface::class, Config::class); |
| 52 | * </pre> |
| 53 | * |
| 54 | * or |
| 55 | * |
| 56 | * <pre> |
| 57 | * Micro::add(Config::class); |
| 58 | * </pre> |
| 59 | */ |
| 60 | public static function add(string $interface, ?string $class = null): void { |
| 61 | if ($class != null && !(is_subclass_of($class, $interface))) { |
| 62 | throw new MicroException("$class does not implement $interface"); |
| 63 | } |
| 64 | self::$classes[$interface] = $class; |
| 65 | } |
| 66 | |
| 67 | public static function hasInterface(string $interface): bool { |
| 68 | return array_key_exists($interface, self::$classes); |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Returns with the class for the given interface |
| 73 | * |
| 74 | * @throws MicroException If the interface wasn't added |
| 75 | */ |
| 76 | public static function getClass(string $interface): string { |
| 77 | if (!self::hasInterface($interface)) { |
| 78 | throw new MicroException("$interface was not added"); |
| 79 | } |
| 80 | return self::$classes[$interface] ?? $interface; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * Creates the singleton instance for the given interface, stores it in `$instances`, then returns with it |
| 85 | * |
| 86 | * It returns instantly if the instance was stored before. |
| 87 | * |
| 88 | * @throws MicroException |
| 89 | */ |
| 90 | public static function get(string $interface, array $parameters = [], array $dependencyStack = []): object { |
| 91 | if (array_key_exists($interface, self::$instances)) { |
| 92 | return self::$instances[$interface]; |
| 93 | } |
| 94 | $result = self::create(self::getClass($interface), $parameters, $dependencyStack); |
| 95 | self::$instances[$interface] = $result; |
| 96 | return $result; |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Returns with all the interfaces in an array |
| 101 | */ |
| 102 | public static function interfaces(): array { |
| 103 | return array_keys(self::$classes); |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Creates an instance for the given class |
| 108 | * |
| 109 | * In the following example, the `Something` class constructor will get the `Config` instance |
| 110 | * and the 'someParameterValue' in the `$someParameter`. |
| 111 | * |
| 112 | * <pre> |
| 113 | * use Dynart\Micro\Micro; |
| 114 | * use Dynart\Micro\App; |
| 115 | * use Dynart\Micro\Config; |
| 116 | * |
| 117 | * class Something { |
| 118 | * private $someParameter; |
| 119 | * public function __construct(Config $config, $someParameter) { |
| 120 | * $this->someParameter = $someParameter; |
| 121 | * } |
| 122 | * |
| 123 | * public function someParameter() { |
| 124 | * return $this->someParameter; |
| 125 | * } |
| 126 | * } |
| 127 | * |
| 128 | * class App extends AbstractApp { |
| 129 | * private $something; |
| 130 | * public function __construct() { |
| 131 | * Micro::add(Config::class); |
| 132 | * Micro::add(Something::class); |
| 133 | * } |
| 134 | * |
| 135 | * public function init() { |
| 136 | * $this->something = Micro::create(Something::class, ['someParameterValue']); |
| 137 | * } |
| 138 | * |
| 139 | * public function process() { |
| 140 | * echo $this->something->someParameter(); |
| 141 | * } |
| 142 | * } |
| 143 | * </pre> |
| 144 | * |
| 145 | * If the class has a `postConstruct()` method it will be called after creation. It can be used for lazy injection. |
| 146 | * |
| 147 | * @throws MicroException |
| 148 | */ |
| 149 | public static function create(string $class, array $parameters = [], array $dependencyStack = []): object { |
| 150 | if (in_array($class, $dependencyStack)) { |
| 151 | throw new MicroException("Circular dependency: ".join(" <- ", $dependencyStack)); |
| 152 | } |
| 153 | $dependencyStack[] = $class; |
| 154 | try { |
| 155 | $reflectionClass = new ReflectionClass($class); |
| 156 | } catch (ReflectionException $e) { |
| 157 | throw new MicroException("Couldn't create reflection class for `$class`"); |
| 158 | } |
| 159 | $dependencies = self::createDependencies($class, $reflectionClass, $dependencyStack); |
| 160 | try { |
| 161 | $result = $reflectionClass->newInstanceArgs(array_merge($dependencies, $parameters)); |
| 162 | } catch (ReflectionException $e) { |
| 163 | throw new MicroException("Couldn't create class `$class`:\nMessage: ".$e->getMessage()."\n".$e->getTraceAsString()); |
| 164 | } |
| 165 | if (method_exists($result, 'postConstruct')) { |
| 166 | $result->postConstruct(); |
| 167 | } |
| 168 | return $result; |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Creates the singleton dependencies for a given class and returns with it as an array |
| 173 | * |
| 174 | * @throws MicroException |
| 175 | */ |
| 176 | private static function createDependencies(string $class, ReflectionClass $reflectionClass, array $dependencyStack = []): array { |
| 177 | $result = []; |
| 178 | $constructor = $reflectionClass->getConstructor(); |
| 179 | if (!$constructor) { |
| 180 | return $result; |
| 181 | } |
| 182 | foreach ($constructor->getParameters() as $parameter) { |
| 183 | $type = $parameter->getType(); |
| 184 | if (!$type || $type->isBuiltin()) { |
| 185 | continue; |
| 186 | } |
| 187 | $interface = $type->getName(); |
| 188 | if (self::hasInterface($interface)) { |
| 189 | $result[] = self::get($interface, [], $dependencyStack); |
| 190 | } else { |
| 191 | throw new MicroException("Non existing dependency `$interface` for `$class`"); |
| 192 | } |
| 193 | } |
| 194 | return $result; |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * Creates an instance of the callable if needed, then returns with it |
| 199 | * |
| 200 | * @throws MicroException |
| 201 | */ |
| 202 | public static function getCallable(mixed $callable): mixed { |
| 203 | return self::isMicroCallable($callable) ? [Micro::get($callable[0]), $callable[1]] : $callable; |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * Returns true if the `$callable` is a Micro Framework callable |
| 208 | * |
| 209 | * Micro Framework callable means: an array with two strings. |
| 210 | * The first one is the class name, the second is the method name. |
| 211 | * |
| 212 | * Example: |
| 213 | * <pre> |
| 214 | * [Something::class, 'theMethodName'] |
| 215 | * </pre> |
| 216 | */ |
| 217 | public static function isMicroCallable(mixed $callable): bool { |
| 218 | return is_array($callable) |
| 219 | && count($callable) == 2 |
| 220 | && is_string($callable[0]) |
| 221 | && is_string($callable[1]); |
| 222 | } |
| 223 | } |