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<?php declare (strict_types=1); namespace ElementorDeps\DI\Compiler; use function chmod; use ElementorDeps\DI\Definition\ArrayDefinition; use ElementorDeps\DI\Definition\DecoratorDefinition; use ElementorDeps\DI\Definition\Definition; use ElementorDeps\DI\Definition\EnvironmentVariableDefinition; use ElementorDeps\DI\Definition\Exception\InvalidDefinition; use ElementorDeps\DI\Definition\FactoryDefinition; use ElementorDeps\DI\Definition\ObjectDefinition; use ElementorDeps\DI\Definition\Reference; use ElementorDeps\DI\Definition\Source\DefinitionSource; use ElementorDeps\DI\Definition\StringDefinition; use ElementorDeps\DI\Definition\ValueDefinition; use ElementorDeps\DI\DependencyException; use ElementorDeps\DI\Proxy\ProxyFactory; use function dirname; use function file_put_contents; use InvalidArgumentException; use ElementorDeps\Laravel\SerializableClosure\Support\ReflectionClosure; use function rename; use function sprintf; use function tempnam; use function unlink; /** * Compiles the container into PHP code much more optimized for performances. * * @author Matthieu Napoli <matthieu@mnapoli.fr> / class Compiler { /* * @var string / private $containerClass; /* * @var string / private $containerParentClass; /* * Definitions indexed by the entry name. The value can be null if the definition needs to be fetched. * * Keys are strings, values are `Definition` objects or null. * * @var \ArrayIterator / private $entriesToCompile; /* * Progressive counter for definitions. * * Each key in $entriesToCompile is defined as 'SubEntry' + counter * and each definition has always the same key in the CompiledContainer * if PHP-DI configuration does not change. * * @var int / private $subEntryCounter; /* * Progressive counter for CompiledContainer get methods. * * Each CompiledContainer method name is defined as 'get' + counter * and remains the same after each recompilation * if PHP-DI configuration does not change. * * @var int / private $methodMappingCounter; /* * Map of entry names to method names. * * @var string[] / private $entryToMethodMapping = []; /* * @var string[] / private $methods = []; /* * @var bool / private $autowiringEnabled; /* * @var ProxyFactory / private $proxyFactory; public function __construct(ProxyFactory $proxyFactory) { $this->proxyFactory = $proxyFactory; } public function getProxyFactory() : ProxyFactory { return $this->proxyFactory; } /* * Compile the container. * * @return string The compiled container file name. / public function compile(DefinitionSource $definitionSource, string $directory, string $className, string $parentClassName, bool $autowiringEnabled) : string { $fileName = \rtrim($directory, '/') . '/' . $className . '.php'; if (\file_exists($fileName)) { // The container is already compiled return $fileName; } $this->autowiringEnabled = $autowiringEnabled; // Validate that a valid class name was provided $validClassName = \preg_match('/^[a-zA-Z_][a-zA-Z0-9_]$/', $className); if (!$validClassName) { throw new InvalidArgumentException("The container cannot be compiled: `{$className}` is not a valid PHP class name"); } $this->entriesToCompile = new \ArrayIterator($definitionSource->getDefinitions()); // We use an ArrayIterator so that we can keep adding new items to the list while we compile entries foreach ($this->entriesToCompile as $entryName => $definition) { $silenceErrors = \false; // This is an entry found by reference during autowiring if (!$definition) { $definition = $definitionSource->getDefinition($entryName); // We silence errors for those entries because type-hints may reference interfaces/abstract classes // which could later be defined, or even not used (we don't want to block the compilation for those) $silenceErrors = \true; } if (!$definition) { // We do not throw a `NotFound` exception here because the dependency // could be defined at runtime continue; } // Check that the definition can be compiled $errorMessage = $this->isCompilable($definition); if ($errorMessage !== \true) { continue; } try { $this->compileDefinition($entryName, $definition); } catch (InvalidDefinition $e) { if ($silenceErrors) { // forget the entry unset($this->entryToMethodMapping[$entryName]); } else { throw $e; } } } $this->containerClass = $className; $this->containerParentClass = $parentClassName; \ob_start(); require __DIR__ . '/Template.php'; $fileContent = \ob_get_clean(); $fileContent = "<?php\n" . $fileContent; $this->createCompilationDirectory(dirname($fileName)); $this->writeFileAtomic($fileName, $fileContent); return $fileName; } private function writeFileAtomic(string $fileName, string $content) : int { $tmpFile = @tempnam(dirname($fileName), 'swap-compile'); if ($tmpFile === \false) { throw new InvalidArgumentException(sprintf('Error while creating temporary file in %s', dirname($fileName))); } @chmod($tmpFile, 0666); $written = file_put_contents($tmpFile, $content); if ($written === \false) { @unlink($tmpFile); throw new InvalidArgumentException(sprintf('Error while writing to %s', $tmpFile)); } @chmod($tmpFile, 0666); $renamed = @rename($tmpFile, $fileName); if (!$renamed) { @unlink($tmpFile); throw new InvalidArgumentException(sprintf('Error while renaming %s to %s', $tmpFile, $fileName)); } return $written; } /** * @throws DependencyException * @throws InvalidDefinition * @return string The method name / private function compileDefinition(string $entryName, Definition $definition) : string { // Generate a unique method name $methodName = 'get' . ++$this->methodMappingCounter; $this->entryToMethodMapping[$entryName] = $methodName; switch (\true) { case $definition instanceof ValueDefinition: $value = $definition->getValue(); $code = 'return ' . $this->compileValue($value) . ';'; break; case $definition instanceof Reference: $targetEntryName = $definition->getTargetEntryName(); $code = 'return $this->delegateContainer->get(' . $this->compileValue($targetEntryName) . ');'; // If this method is not yet compiled we store it for compilation if (!isset($this->entriesToCompile[$targetEntryName])) { $this->entriesToCompile[$targetEntryName] = null; } break; case $definition instanceof StringDefinition: $entryName = $this->compileValue($definition->getName()); $expression = $this->compileValue($definition->getExpression()); $code = 'return \\DI\\Definition\\StringDefinition::resolveExpression(' . $entryName . ', ' . $expression . ', $this->delegateContainer);'; break; case $definition instanceof EnvironmentVariableDefinition: $variableName = $this->compileValue($definition->getVariableName()); $isOptional = $this->compileValue($definition->isOptional()); $defaultValue = $this->compileValue($definition->getDefaultValue()); $code = <<<PHP \$value = \$_ENV[{$variableName}] ?? \$_SERVER[{$variableName}] ?? getenv({$variableName}); if (false !== \$value) return \$value; if (!{$isOptional}) { throw new \\DI\\Definition\\Exception\\InvalidDefinition("The environment variable '{$definition->getVariableName()}' has not been defined"); } return {$defaultValue}; PHP; break; case $definition instanceof ArrayDefinition: try { $code = 'return ' . $this->compileValue($definition->getValues()) . ';'; } catch (\Exception $e) { throw new DependencyException(sprintf('Error while compiling %s. %s', $definition->getName(), $e->getMessage()), 0, $e); } break; case $definition instanceof ObjectDefinition: $compiler = new ObjectCreationCompiler($this); $code = $compiler->compile($definition); $code .= "\n return \$object;"; break; case $definition instanceof DecoratorDefinition: $decoratedDefinition = $definition->getDecoratedDefinition(); if (!$decoratedDefinition instanceof Definition) { if (!$definition->getName()) { throw new InvalidDefinition('Decorators cannot be nested in another definition'); } throw new InvalidDefinition(sprintf('Entry "%s" decorates nothing: no previous definition with the same name was found', $definition->getName())); } $code = sprintf('return call_user_func(%s, %s, $this->delegateContainer);', $this->compileValue($definition->getCallable()), $this->compileValue($decoratedDefinition)); break; case $definition instanceof FactoryDefinition: $value = $definition->getCallable(); // Custom error message to help debugging $isInvokableClass = \is_string($value) && \class_exists($value) && \method_exists($value, '__invoke'); if ($isInvokableClass && !$this->autowiringEnabled) { throw new InvalidDefinition(sprintf('Entry "%s" cannot be compiled. Invokable classes cannot be automatically resolved if autowiring is disabled on the container, you need to enable autowiring or define the entry manually.', $entryName)); } $definitionParameters = ''; if (!empty($definition->getParameters())) { $definitionParameters = ', ' . $this->compileValue($definition->getParameters()); } $code = sprintf('return $this->resolveFactory(%s, %s%s);', $this->compileValue($value), \var_export($entryName, \true), $definitionParameters); break; default: // This case should not happen (so it cannot be tested) throw new \Exception('Cannot compile definition of type ' . \get_class($definition)); } $this->methods[$methodName] = $code; return $methodName; } public function compileValue($value) : string { // Check that the value can be compiled $errorMessage = $this->isCompilable($value); if ($errorMessage !== \true) { throw new InvalidDefinition($errorMessage); } if ($value instanceof Definition) { // Give it an arbitrary unique name $subEntryName = 'subEntry' . ++$this->subEntryCounter; // Compile the sub-definition in another method $methodName = $this->compileDefinition($subEntryName, $value); // The value is now a method call to that method (which returns the value) return "\$this->{$methodName}()"; } if (\is_array($value)) { $value = \array_map(function ($value, $key) { $compiledValue = $this->compileValue($value); $key = \var_export($key, \true); return " {$key} => {$compiledValue},\n"; }, $value, \array_keys($value)); $value = \implode('', $value); return "[\n{$value} ]"; } if ($value instanceof \Closure) { return $this->compileClosure($value); } return \var_export($value, \true); } private function createCompilationDirectory(string $directory) { if (!\is_dir($directory) && !@\mkdir($directory, 0777, \true) && !\is_dir($directory)) { throw new InvalidArgumentException(sprintf('Compilation directory does not exist and cannot be created: %s.', $directory)); } if (!\is_writable($directory)) { throw new InvalidArgumentException(sprintf('Compilation directory is not writable: %s.', $directory)); } } /* * @return string\|true If true is returned that means that the value is compilable. / private function isCompilable($value) { if ($value instanceof ValueDefinition) { return $this->isCompilable($value->getValue()); } if ($value instanceof DecoratorDefinition) { if (empty($value->getName())) { return 'Decorators cannot be nested in another definition'; } } // All other definitions are compilable if ($value instanceof Definition) { return \true; } if ($value instanceof \Closure) { return \true; } if (\is_object($value)) { return 'An object was found but objects cannot be compiled'; } if (\is_resource($value)) { return 'A resource was found but resources cannot be compiled'; } return \true; } /* * @throws \DI\Definition\Exception\InvalidDefinition */ private function compileClosure(\Closure $closure) : string { $reflector = new ReflectionClosure($closure); if ($reflector->getUseVariables()) { throw new InvalidDefinition('Cannot compile closures which import variables using the `use` keyword'); } if ($reflector->isBindingRequired() \|\| $reflector->isScopeRequired()) { throw new InvalidDefinition('Cannot compile closures which use $this or self/static/parent references'); } // Force all closures to be static (add the `static` keyword), i.e. they can't use // $this, which makes sense since their code is copied into another class. $code = ($reflector->isStatic() ? '' : 'static ') . $reflector->getCode(); $code = \trim($code, "\t\n\r;"); return $code; } }

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