--- /dev/null
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\drupalmoduleupgrader\Plugin\DMU\Fixer\PSR4.
+ */
+
+namespace Drupal\drupalmoduleupgrader\Plugin\DMU\Fixer;
+
+use Drupal\drupalmoduleupgrader\FixerBase;
+use Pharborist\Namespaces\NameNode;
+use Pharborist\Parser;
+use Pharborist\RootNode;
+use Pharborist\WhitespaceNode;
+
+/**
+ * @Fixer(
+ * id = "psr4ify"
+ * )
+ */
+class PSR4 extends FixerBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function execute() {
+ /** @var \Pharborist\Objects\ClassNode $class */
+ $class = $this
+ ->target
+ ->getIndexer('class')
+ ->get($this->configuration['source']);
+
+ $ns = substr($this->configuration['destination'], 0, strrpos($this->configuration['destination'], '\\'));
+ $doc = RootNode::create($ns);
+ $ns = $doc->getNamespace($ns);
+ WhitespaceNode::create("\n")->appendTo($ns);
+
+ $import = [];
+
+ if ($parent = $class->getExtends()) {
+ $import[] = $parent->getAbsolutePath();
+ }
+
+ $interfaces = $class->getImplementList();
+ if ($interfaces) {
+ foreach ($interfaces->getItems() as $interface) {
+ $import[] = $interface->getAbsolutePath();
+ }
+ }
+
+ foreach ($class->getMethods() as $method) {
+ foreach ($method->getParameters() as $parameter) {
+ $type_hint = $parameter->getTypeHint();
+ if ($type_hint instanceof NameNode) {
+ $import[] = $type_hint->getAbsolutePath();
+ }
+ }
+ }
+
+ foreach (array_unique($import) as $i) {
+ Parser::parseSnippet('use ' . ltrim($i, '\\') . ';')->appendTo($ns);
+ WhitespaceNode::create("\n")->appendTo($ns);
+ }
+
+ WhitespaceNode::create("\n")->appendTo($ns);
+ $class->remove()->appendTo($ns);
+
+ $search_for = ['Drupal\\' . $this->target->id(), '\\'];
+ $replace_with = ['src', '/'];
+ $path = str_replace($search_for, $replace_with, $this->configuration['destination']) . '.php';
+ file_put_contents($this->target->getPath($path), $doc->getText());
+ }
+
+}