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<?php |
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declare(strict_types = 1); |
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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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use PhpParser\Node; |
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use PhpParser\NodeTraverser; |
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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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*/ |
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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 $instance; |
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if (!$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 string See RESULT_XXX constants in the interface |
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*/ |
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public function transform(StreamMetaData $metadata): string |
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{ |
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$newExpressionFinder = new NodeFinderVisitor([Node\Expr\New_::class]); |
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// TODO: move this logic into walkSyntaxTree(Visitor $nodeVistor) method |
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$traverser = new NodeTraverser(); |
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$traverser->addVisitor($newExpressionFinder); |
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$traverser->traverse($metadata->syntaxTree); |
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/** @var Node\Expr\New_[] $newExpressions */ |
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$newExpressions = $newExpressionFinder->getFoundNodes(); |
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if (empty($newExpressions)) { |
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return self::RESULT_ABSTAIN; |
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} |
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foreach ($newExpressions as $newExpressionNode) { |
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$startPosition = $newExpressionNode->getAttribute('startTokenPos'); |
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$metadata->tokenStream[$startPosition][1] = '\\' . __CLASS__ . '::getInstance()->{'; |
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if ($metadata->tokenStream[$startPosition+1][0] === T_WHITESPACE) { |
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unset($metadata->tokenStream[$startPosition+1]); |
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} |
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$isExplicitClass = $newExpressionNode->class instanceof Node\Name; |
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$endClassNamePos = $newExpressionNode->class->getAttribute('endTokenPos'); |
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$expressionSuffix = $isExplicitClass ? '::class}' : '}'; |
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$metadata->tokenStream[$endClassNamePos][1] .= $expressionSuffix; |
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} |
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return self::RESULT_TRANSFORMED; |
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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(string $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
