woocommerce-paypal-payments/inc/autoload.php

<?php
declare( strict_types=1 );

namespace Inpsyde\PayPalCommerce;

function autoload() {

	/**
	 * Custom WordPress autoloader.
	 */
	spl_autoload_register(
		function( $class_name ) {
			if (
				strpos($class_name, 'Inpsyde\PayPalCommerce') === false
				&& strpos($class_name, 'Inpsyde\Woocommerce') === false
			) {
				return;
			}
			$class_parts = explode("\\", $class_name);
			$module_dir = dirname(__DIR__) . '/modules.local/';
			$modules = [
				'Button' => $module_dir . 'ppcp-button/src/',
				'Onboarding' => $module_dir . 'ppcp-onboarding/src/',
				'Subscription' => $module_dir . 'ppcp-subscription/src/',
				'WcGateway' => $module_dir . 'ppcp-wc-gateway/src/',
				'Webhooks' => $module_dir . 'ppcp-webhooks/src/',
				'Logging' => $module_dir . 'woocommerce-logging/src/',
			];

			if (isset($class_parts[2]) && ! isset($class_parts[3])) {
				$file_path = dirname(__DIR__) . '/src/class-' . strtolower($class_parts[2]) . '.php';
				include $file_path;
				return;
			}

			if (! isset($modules[$class_parts[2]])) {
				return;
			}

			$file_path = $modules[$class_parts[2]];
			unset ($class_parts[0]);
			unset ($class_parts[1]);
			unset ($class_parts[2]);
			$file_name = 'class-' . strtolower(end($class_parts)) . '.php';
			array_pop($class_parts);

			$file_path .= implode(DIRECTORY_SEPARATOR, $class_parts) . '/' . $file_name;
			include $file_path;
		}
	);

	// Load composer autoloader.
	include dirname(__DIR__) . '/vendor/autoload.php';

}