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<?php |
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|
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declare(strict_types=1); |
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|
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namespace IvyForms\Vendor\DI\Compiler; |
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|
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use IvyForms\Vendor\DI\Definition\Exception\InvalidDefinition; |
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use IvyForms\Vendor\DI\Definition\ObjectDefinition; |
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use IvyForms\Vendor\DI\Definition\ObjectDefinition\MethodInjection; |
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use ReflectionClass; |
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use ReflectionMethod; |
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use ReflectionParameter; |
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use ReflectionProperty; |
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|
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/** |
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* Compiles an object definition into native PHP code that, when executed, creates the object. |
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* |
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* @author Matthieu Napoli <[email protected]> |
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*/ |
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class ObjectCreationCompiler |
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{ |
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/** |
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* @var Compiler |
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*/ |
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private $compiler; |
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|
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public function __construct(Compiler $compiler) |
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{ |
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$this->compiler = $compiler; |
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} |
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|
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public function compile(ObjectDefinition $definition) : string |
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{ |
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$this->assertClassIsNotAnonymous($definition); |
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$this->assertClassIsInstantiable($definition); |
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|
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// Lazy? |
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if ($definition->isLazy()) { |
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return $this->compileLazyDefinition($definition); |
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} |
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|
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try { |
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$classReflection = new ReflectionClass($definition->getClassName()); |
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$constructorArguments = $this->resolveParameters($definition->getConstructorInjection(), $classReflection->getConstructor()); |
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$dumpedConstructorArguments = array_map(function ($value) { |
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return $this->compiler->compileValue($value); |
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}, $constructorArguments); |
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|
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$code = []; |
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$code[] = sprintf( |
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'$object = new %s(%s);', |
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$definition->getClassName(), |
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implode(', ', $dumpedConstructorArguments) |
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); |
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|
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// Property injections |
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foreach ($definition->getPropertyInjections() as $propertyInjection) { |
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$value = $propertyInjection->getValue(); |
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$value = $this->compiler->compileValue($value); |
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|
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$className = $propertyInjection->getClassName() ?: $definition->getClassName(); |
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$property = new ReflectionProperty($className, $propertyInjection->getPropertyName()); |
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if ($property->isPublic()) { |
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$code[] = sprintf('$object->%s = %s;', $propertyInjection->getPropertyName(), $value); |
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} else { |
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// Private/protected property |
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$code[] = sprintf( |
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'\IvyForms\Vendor\DI\Definition\Resolver\ObjectCreator::setPrivatePropertyValue(%s, $object, \'%s\', %s);', |
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var_export($propertyInjection->getClassName(), true), |
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$propertyInjection->getPropertyName(), |
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$value |
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); |
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} |
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} |
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|
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// Method injections |
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foreach ($definition->getMethodInjections() as $methodInjection) { |
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$methodReflection = new \ReflectionMethod($definition->getClassName(), $methodInjection->getMethodName()); |
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$parameters = $this->resolveParameters($methodInjection, $methodReflection); |
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|
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$dumpedParameters = array_map(function ($value) { |
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return $this->compiler->compileValue($value); |
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}, $parameters); |
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|
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$code[] = sprintf( |
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'$object->%s(%s);', |
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$methodInjection->getMethodName(), |
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implode(', ', $dumpedParameters) |
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); |
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} |
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} catch (InvalidDefinition $e) { |
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throw InvalidDefinition::create($definition, sprintf( |
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'Entry "%s" cannot be compiled: %s', |
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$definition->getName(), |
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$e->getMessage() |
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)); |
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} |
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|
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return implode("\n ", $code); |
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} |
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|
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public function resolveParameters(MethodInjection $definition = null, ReflectionMethod $method = null) : array |
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{ |
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$args = []; |
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|
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if (! $method) { |
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return $args; |
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} |
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|
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$definitionParameters = $definition ? $definition->getParameters() : []; |
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|
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foreach ($method->getParameters() as $index => $parameter) { |
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if (array_key_exists($index, $definitionParameters)) { |
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// Look in the definition |
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$value = &$definitionParameters[$index]; |
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} elseif ($parameter->isOptional()) { |
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// If the parameter is optional and wasn't specified, we take its default value |
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$args[] = $this->getParameterDefaultValue($parameter, $method); |
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continue; |
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} else { |
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throw new InvalidDefinition(sprintf( |
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'Parameter $%s of %s has no value defined or guessable', |
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$parameter->getName(), |
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$this->getFunctionName($method) |
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)); |
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} |
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|
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$args[] = &$value; |
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} |
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|
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return $args; |
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} |
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|
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private function compileLazyDefinition(ObjectDefinition $definition) : string |
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{ |
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$subDefinition = clone $definition; |
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$subDefinition->setLazy(false); |
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$subDefinition = $this->compiler->compileValue($subDefinition); |
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|
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$this->compiler->getProxyFactory()->generateProxyClass($definition->getClassName()); |
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|
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return <<<PHP |
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\$object = \$this->proxyFactory->createProxy( |
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'{$definition->getClassName()}', |
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function (&\$wrappedObject, \$proxy, \$method, \$params, &\$initializer) { |
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\$wrappedObject = $subDefinition; |
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\$initializer = null; // turning off further lazy initialization |
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return true; |
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} |
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); |
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PHP; |
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} |
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|
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/** |
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* Returns the default value of a function parameter. |
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* |
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* @throws InvalidDefinition Can't get default values from PHP internal classes and functions |
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* @return mixed |
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*/ |
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private function getParameterDefaultValue(ReflectionParameter $parameter, ReflectionMethod $function) |
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{ |
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try { |
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return $parameter->getDefaultValue(); |
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} catch (\ReflectionException $e) { |
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throw new InvalidDefinition(sprintf( |
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'The parameter "%s" of %s has no type defined or guessable. It has a default value, ' |
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. 'but the default value can\'t be read through Reflection because it is a PHP internal class.', |
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$parameter->getName(), |
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$this->getFunctionName($function) |
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)); |
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} |
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} |
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|
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private function getFunctionName(ReflectionMethod $method) : string |
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{ |
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return $method->getName() . '()'; |
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} |
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|
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private function assertClassIsNotAnonymous(ObjectDefinition $definition) |
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{ |
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if (strpos($definition->getClassName(), '@') !== false) { |
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throw InvalidDefinition::create($definition, sprintf( |
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'Entry "%s" cannot be compiled: anonymous classes cannot be compiled', |
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$definition->getName() |
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)); |
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} |
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} |
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|
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private function assertClassIsInstantiable(ObjectDefinition $definition) |
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{ |
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if ($definition->isInstantiable()) { |
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return; |
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} |
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|
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$message = ! $definition->classExists() |
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? 'Entry "%s" cannot be compiled: the class doesn\'t exist' |
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: 'Entry "%s" cannot be compiled: the class is not instantiable'; |
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|
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throw InvalidDefinition::create($definition, sprintf($message, $definition->getName())); |
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} |
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} |
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|
