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diff --git a/src/Registration/Autoloader.php b/src/Registration/Autoloader.php
new file mode 100644
--- /dev/null
+++ b/src/Registration/Autoloader.php
@@ -0,0 +1,39 @@
+<?php
+declare(strict_types=1);
+
+namespace Keruald\OmniTools\Registration;
+
+class Autoloader {
+
+ ///
+ /// PSR-4
+ ///
+
+ public static function registerPSR4 (string $namespace, string $path) : void {
+ spl_autoload_register(function ($class) use ($namespace, $path) {
+ $len = strlen($namespace);
+
+ if (substr($class, 0, $len) === $namespace) {
+ $classPath = Autoloader::getPathFor(substr($class, $len));
+ include $path . '/' . $classPath;
+ }
+ });
+ }
+
+ public static function getPathFor (string $name) : string {
+ return str_replace("\\", "/", $name) . '.php';
+ }
+
+ ///
+ /// Methods to register OmniTools library
+ ///
+
+ public static function selfRegister () : void {
+ self::registerPSR4("Keruald\\OmniTools\\", self::getLibraryPath());
+ }
+
+ public static function getLibraryPath () : string {
+ return dirname(__DIR__);
+ }
+
+}
diff --git a/tests/Registration/AutoloaderTest.php b/tests/Registration/AutoloaderTest.php
new file mode 100644
--- /dev/null
+++ b/tests/Registration/AutoloaderTest.php
@@ -0,0 +1,61 @@
+<?php
+declare(strict_types=1);
+
+namespace Keruald\OmniTools\Tests\Registration;
+
+use Keruald\OmniTools\Registration\Autoloader;
+use PHPUnit\Framework\TestCase;
+
+use Acme\MockLib\Foo; // a mock class in a mock namespace to test autoload.
+
+class AutoloaderTest extends TestCase {
+
+ ///
+ /// Tests
+ ///
+
+ /**
+ * @dataProvider providePaths
+ */
+ public function testGetPathFor (string $class, string $expected) : void {
+ $this->assertEquals($expected, Autoloader::getPathFor($class));
+ }
+
+ public function testRegisterPSR4 () : void {
+ $class = Foo::class;
+ $this->assertFalse(
+ class_exists($class),
+ "Please reconfigure the test suite not to include the $class class."
+ );
+
+ Autoloader::registerPSR4("Acme\\MockLib\\", __DIR__ . "/MockLib");
+ $this->assertTrue(class_exists($class));
+ }
+
+ public function testGetLibraryPath () : void {
+ $this->assertStringStartsWith(
+ dirname(Autoloader::getLibraryPath()), // lib is in <root>/src
+ __DIR__ // we are in <root>/tests/…
+ );
+ }
+
+ public function testRegister () : void {
+ $count = count(spl_autoload_functions());
+
+ Autoloader::selfRegister();
+
+ $this->assertEquals(++$count, count(spl_autoload_functions()));
+ }
+
+ ///
+ /// Data provider
+ ///
+
+ public function providePaths () : iterable {
+ // Example from PSR-4 canonical document
+ yield ['File_Writer', 'File_Writer.php'];
+ yield ['Response\Status', 'Response/Status.php'];
+ yield ['Request', 'Request.php'];
+ }
+
+}
diff --git a/tests/Registration/MockLib/Foo.php b/tests/Registration/MockLib/Foo.php
new file mode 100644
--- /dev/null
+++ b/tests/Registration/MockLib/Foo.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace Acme\MockLib;
+
+/**
+ * Class Foo
+ *
+ * This class allows to check if the autoloader can register
+ * the Acme\MockLib namespace and include this file.
+ *
+ * @package Acme\MockLib
+ */
+class Foo {
+
+}

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