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<?php declare(strict_types=1); |
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namespace jschreuder\MiddleDi; |
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use ReflectionClass; |
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use ReflectionMethod; |
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use ReflectionNamedType; |
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use RuntimeException; |
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final class DiCompiler implements DiCompilerInterface |
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{ |
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const COMPILED_EXTENSION = '__Compiled'; |
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private string $parentDi; |
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public function __construct(string $parentDi) |
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{ |
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$this->parentDi = $parentDi; |
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} |
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private function getCompiledName(): string |
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{ |
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return $this->parentDi . self::COMPILED_EXTENSION; |
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} |
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public function compiledClassExists(): bool |
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{ |
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return class_exists($this->getCompiledName()); |
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} |
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public function compile(): void |
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{ |
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if ($this->compiledClassExists()) { |
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throw new \RuntimeException('Cannot recompile already compiled container'); |
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} |
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eval(substr($this->generateCode(), 32)); |
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} |
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public function generateCode(): string |
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{ |
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$parent = new ReflectionClass($this->parentDi); |
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$code = $this->generateHeader($parent); |
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$methods = $parent->getMethods(); |
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foreach ($methods as $method) { |
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$code .= $this->processMethod($method); |
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} |
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return $code . $this->generateFooter(); |
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} |
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private function generateHeader(ReflectionClass $parent) |
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{ |
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return |
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'<?php declare(strict_types=1); |
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namespace ' . $parent->getNamespaceName() . '; |
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use ' . $parent->getName() . '; |
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class ' . $parent->getShortName() . self::COMPILED_EXTENSION . ' extends ' . $parent->getShortName() . ' |
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{ |
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private array $__services = []; |
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private function __service(string $method, ?string $instanceName = null) |
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{ |
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$suffix = is_null($instanceName) ? \'\' : \'.\' . $instanceName; |
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return $this->__services[$method . $suffix] ?? ($this->__services[$method . $suffix] = parent::{$method}($instanceName)); |
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} |
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'; |
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} |
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2 |
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public function processMethod(ReflectionMethod $method): string |
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{ |
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// Decide if the method needs to be overloaded |
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if (substr($method->getName(), 0, 3) !== 'get') { |
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return ''; |
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} |
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// Run validations |
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$this->validateServiceDefinitionReturnType($method); |
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$this->validateServiceDefinitionParameters($method); |
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// Generate method-overload code |
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return ' |
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public function ' . $method->getName() . '(?string $instanceName = null): \\' . $method->getReturnType()->getName() . ' |
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{ |
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return $this->__service(\'' . $method->getName() . '\', $instanceName); |
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} |
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'; |
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} |
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private function validateServiceDefinitionReturnType(ReflectionMethod $method): void |
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{ |
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// It must have a return type, and the return type must only define a single class or interface |
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if (!$method->hasReturnType()) { |
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throw new RuntimeException('Service definitions must have return types'); |
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} |
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$returnType = $method->getReturnType(); |
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if (!$returnType instanceof ReflectionNamedType) { |
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throw new RuntimeException('Service definitions must define only a single class or interface returntype'); |
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} |
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if ($returnType->isBuiltin()) { |
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throw new RuntimeException('Service definitions must return objects'); |
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} |
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} |
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private function validateServiceDefinitionParameters(ReflectionMethod $method): void |
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{ |
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if ($method->getNumberOfParameters() > 1) { |
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throw new RuntimeException('Service definitions cannot take more than a name parameter'); |
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} |
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if ($method->getNumberOfParameters() === 1) { |
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$parameter = $method->getParameters()[0]; |
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if (!is_a($parameter->getType(), ReflectionNamedType::class) || $parameter->getType()->getName() !== 'string') { |
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throw new \RuntimeException('Service definitions are only allowed a single named nullable string argument.'); |
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} |
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} |
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} |
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private function generateFooter(): string |
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{ |
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return PHP_EOL . '}' . PHP_EOL; |
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} |
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public function newInstance(array ...$args): mixed |
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{ |
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$reflectedClass = new ReflectionClass($this->getCompiledName()); |
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return $reflectedClass->newInstance(...$args); |
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} |
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} |
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jschreuder /
Middle-DI
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