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<?php |
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/* |
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* Go! AOP framework |
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* |
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* @copyright Copyright 2014, Lisachenko Alexander <[email protected]> |
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* |
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* This source file is subject to the license that is bundled |
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* with this source code in the file LICENSE. |
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*/ |
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namespace Go\Instrument\Transformer; |
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use Go\Aop\Framework\ReflectionConstructorInvocation; |
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use Go\Core\AspectContainer; |
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/** |
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* Transforms the source code to add an ability to intercept new instances creation |
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* |
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* @see https://github.com/php/php-src/blob/master/Zend/zend_language_parser.y |
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* |
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* new_expr: |
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* T_NEW |
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* class_name_reference |
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* ctor_arguments |
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* |
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* class_name_reference: |
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* class_name |
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* | new_variable |
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* |
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* class_name: |
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* T_STATIC |
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* | name |
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* |
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* namespace_name: |
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* T_STRING |
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* | namespace_name T_NS_SEPARATOR T_STRING |
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* |
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* name: |
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* namespace_name |
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* | T_NAMESPACE T_NS_SEPARATOR namespace_name |
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* | T_NS_SEPARATOR namespace_name |
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* |
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* ctor_arguments: |
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* / empty / |
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* | argument_list |
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*/ |
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class ConstructorExecutionTransformer implements SourceTransformer |
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{ |
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/** |
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* List of constructor invocations per class |
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* |
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* @var array|ReflectionConstructorInvocation[] |
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*/ |
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private static $constructorInvocationsCache = []; |
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/** |
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* Singletone |
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* |
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* @return static |
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*/ |
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public static function getInstance() |
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{ |
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static $instance = null; |
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if (!$instance) { |
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$instance = new static; |
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} |
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return $instance; |
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} |
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/** |
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* Rewrites all "new" expressions with our implementation |
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* |
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* @param StreamMetaData $metadata Metadata for source |
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* |
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* @return void|bool Return false if transformation should be stopped |
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*/ |
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public function transform(StreamMetaData $metadata = null) |
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{ |
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if (strpos($metadata->source, 'new ') === false) { |
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return; |
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} |
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$tokenStream = token_get_all($metadata->source); |
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$transformedSource = ''; |
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$isWaitingClass = false; |
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$isWaitingEnd = false; |
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$isClassName = true; |
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$classNamePosition = 0; |
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foreach ($tokenStream as $index=>$token) { |
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list ($token, $tokenValue) = (array) $token + array(1 => $token); |
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if ($isWaitingClass && $token !== T_WHITESPACE && $token !== T_COMMENT) { |
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$classNamePosition++; |
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if ($token === T_VARIABLE && $classNamePosition === 1) { |
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$isWaitingEnd = true; |
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$isWaitingClass = false; |
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} |
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if (in_array($tokenStream[$index + 1], array('(', ';', ')', '.'))) { |
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$isWaitingEnd = true; |
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$isWaitingClass = false; |
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} |
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if ($isClassName && $token !== T_NS_SEPARATOR && $token !== T_STRING && $token !== T_STATIC) { |
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$isClassName = false; |
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} |
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} |
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if ($token === T_NEW) { |
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$tokenValue = '\\' . __CLASS__ . '::getInstance()->{'; |
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$isWaitingClass = true; |
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$isClassName = true; |
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$classNamePosition = 0; |
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} |
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$transformedSource .= $tokenValue; |
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if ($isWaitingEnd) { |
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$transformedSource .= $isClassName ? '::class' : ''; |
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$transformedSource .= '}'; |
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$isWaitingEnd = false; |
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} |
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} |
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$metadata->source = $transformedSource; |
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} |
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/** |
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* Magic interceptor for instance creation |
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* |
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* @param string $className Name of the class to construct |
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* |
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* @return object Instance of required object |
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*/ |
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public function __get($className) |
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{ |
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return static::construct($className); |
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} |
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/** |
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* Magic interceptor for instance creation |
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* |
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* @param string $className Name of the class to construct |
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* @param array $args Arguments for the constructor |
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* |
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* @return object Instance of required object |
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*/ |
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public function __call($className, array $args) |
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{ |
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return static::construct($className, $args); |
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} |
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/** |
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* Default implementation for accessing joinpoint or creating a new one on-fly |
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* |
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* @param string $fullClassName Name of the class to create |
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* @param array $arguments Arguments for constructor |
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* |
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* @return object |
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*/ |
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protected static function construct($fullClassName, array $arguments = []) |
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{ |
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$fullClassName = ltrim($fullClassName, '\\'); |
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if (!isset(self::$constructorInvocationsCache[$fullClassName])) { |
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$invocation = null; |
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$dynamicInit = AspectContainer::INIT_PREFIX . ':root'; |
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try { |
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$joinPointsRef = new \ReflectionProperty($fullClassName, '__joinPoints'); |
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$joinPointsRef->setAccessible(true); |
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$joinPoints = $joinPointsRef->getValue(); |
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if (isset($joinPoints[$dynamicInit])) { |
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$invocation = $joinPoints[$dynamicInit]; |
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} |
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} catch (\ReflectionException $e) { |
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$invocation = null; |
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} |
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if (!$invocation) { |
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$invocation = new ReflectionConstructorInvocation($fullClassName, 'root', []); |
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} |
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self::$constructorInvocationsCache[$fullClassName] = $invocation; |
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} |
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return self::$constructorInvocationsCache[$fullClassName]->__invoke($arguments); |
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} |
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} |
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goaop /
framework
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