FactoryGenerator.php

#!/usr/bin/php
<?php

require_once __DIR__ . '/vendor/autoload.php';

// Path to file was passed to the script, find out FQCN of the class with the power of PSR4 mapping!
$file = substr(getcwd() . '/' . $argv[1], 0, -4);
$namespaces = include __DIR__ . '/vendor/composer/autoload_psr4.php';
foreach ($namespaces as $namespace => $paths) {
    if (strpos($file, $paths[0]) === 0) {
        $file = str_replace(
            [$paths[0], '\\', '/'],
            [$namespace, '', '\\'],
            $file
        );
        break;
    }
}

$explode = explode('\\', $file);
$ns = $explode[0];

$class = new ReflectionClass($file);
if ($class->hasMethod('__construct')) {
    $constructorArguments = $class->getConstructor()->getParameters();

    // generate contents of Factory class
    $factory = '<?php' . PHP_EOL . PHP_EOL . 'namespace ' . $ns . '\Factory;' . PHP_EOL . PHP_EOL
        . 'use Interop\Container\ContainerInterface;' . PHP_EOL
        . 'use ' . $class->getName() . ';' . PHP_EOL;

    foreach ($constructorArguments as $item) {
        if ($item->getClass() !== null) {
            $factory .= 'use ' . $item->getClass()->getName() . ';' . PHP_EOL;
        }
    }

    $ind = '    ';

    $factory .= PHP_EOL . 'final class ' . $class->getShortName() . 'Factory' . PHP_EOL
        . '{' . PHP_EOL
        . $ind . 'public function __invoke(ContainerInterface $container): ' . $class->getShortName() . PHP_EOL
        . $ind . '{' . PHP_EOL
        . $ind . $ind . 'return new ' . $class->getShortName() . '(' . PHP_EOL;

    foreach ($constructorArguments as $item) {
        if ($item->getClass() !== null) {
            $factory .= $ind . $ind . $ind . '$container->get(' . $item->getClass()->getShortName() . '::class)';
        } else {
            $factory .= $ind . $ind . $ind . '$' . $item->getName();
        }
        // ommit last comma
        $factory .= $item === end($constructorArguments) ? PHP_EOL : ',' . PHP_EOL;
    }

    $factory .= $ind . $ind . ');' . PHP_EOL . $ind . '}' . PHP_EOL . '}';

    $target = dirname($class->getFileName()) . '/../Factory/' . $class->getShortName() . 'Factory.php';
    file_put_contents(
        $target,
        $factory
    );

    echo 'Factory generated in ' . $target . '.' . PHP_EOL;
    echo $class->getName() . '::class => ' . $ns . '\Factory\\' . $class->getShortName() . 'Factory::class,' . PHP_EOL;
} else {
    echo 'Class doesn\'t have a constructor!' . PHP_EOL;
}