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diff --git a/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Indexer/Classes.php b/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Indexer/Classes.php
new file mode 100644
index 000000000..e5d962497
--- /dev/null
+++ b/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Indexer/Classes.php
@@ -0,0 +1,118 @@
+<?php
+
+namespace Drupal\drupalmoduleupgrader\Plugin\DMU\Indexer;
+
+use Drupal\drupalmoduleupgrader\IndexerBase;
+use Drupal\drupalmoduleupgrader\IndexerUsageInterface;
+use Pharborist\Filter;
+use Pharborist\NodeCollection;
+use Pharborist\NodeInterface;
+use Pharborist\Objects\ClassNode;
+use Pharborist\Objects\NewNode;
+use Pharborist\Parser;
+
+/**
+ * @Indexer(
+ *  id = "class"
+ * )
+ */
+class Classes extends IndexerBase implements IndexerUsageInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function addFile($path) {
+    $doc = Parser::parseFile($path);
+
+    $doc
+      ->find(Filter::isInstanceOf('\Pharborist\Objects\ClassNode'))
+      ->each([ $this, 'add' ]);
+
+    $doc
+      ->find(Filter::isInstanceOf('\Pharborist\Objects\NewNode'))
+      ->each([ $this, 'add' ]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function add(NodeInterface $node) {
+    $fields = [
+      'file' => $node->getFilename(),
+      'type' => get_class($node),
+    ];
+
+    if ($node instanceof ClassNode) {
+      $fields['id'] = (string) $node->getName();
+      $fields['parent'] = (string) $node->getExtends();
+    }
+    elseif ($node instanceof NewNode) {
+      $fields['id'] = (string) $node->getClassName();
+    }
+    else {
+      throw new \InvalidArgumentException('Unexpected node type (expected ClassNode or NewNode).');
+    }
+
+    $this->db->insert($this->table)->fields($fields)->execute();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function get($identifier) {
+    $file = $this->getQuery(['file'])
+      ->condition('id', $identifier)
+      ->execute()
+      ->fetchField();
+
+    return $this->target
+      ->open($file)
+      ->find(Filter::isClass($identifier))
+      ->get(0);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFields() {
+    $fields = parent::getFields();
+
+    $fields['type'] = array(
+      'type' => 'varchar',
+      'length' => 255,
+      'not null' => TRUE,
+    );
+    $fields['parent'] = array(
+      'type' => 'varchar',
+      'length' => 255,
+    );
+
+    return $fields;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getUsages($identifier) {
+    $files = $this->getQuery(['file'])
+      ->distinct()
+      ->condition('id', $identifier)
+      ->condition('type', 'Pharborist\Objects\NewNode')
+      ->execute()
+      ->fetchCol();
+
+    $usages = new NodeCollection();
+    foreach ($files as $file) {
+      $this->target
+        ->open($file)
+        ->find(Filter::isInstanceOf('\Pharborist\Objects\NewNode'))
+        ->filter(function(NewNode $node) use ($identifier) {
+          return $node->getClassName() == $identifier;
+        })
+        ->addTo($usages);
+    }
+
+    return $usages;
+  }
+
+}