diff --git a/src/FilesFinder/ClientFilesFinder.php b/src/FilesFinder/ClientFilesFinder.php
new file mode 100644
index 0000000..b8ace99
--- /dev/null
+++ b/src/FilesFinder/ClientFilesFinder.php
@@ -0,0 +1,47 @@
+<?php
+declare(strict_types = 1);
+
+namespace LanguageServer\ContentRetriever;
+
+use LanguageServer\LanguageClient;
+use Sabre\Event\Promise;
+
+/**
+ * Retrieves file content from the client through a textDocument/xcontent request
+ */
+class ClientFilesFinder implements FilesFinder
+{
+    /**
+     * @var LanguageClient
+     */
+    private $client;
+
+    /**
+     * @param LanguageClient $client
+     */
+    public function __construct(LanguageClient $client)
+    {
+        $this->client = $client;
+    }
+
+    /**
+     * Returns all files in the workspace that match a glob.
+     * If the client does not support workspace/files, it falls back to searching the file system directly.
+     *
+     * @param string $glob
+     * @return Promise <string[]> The URIs
+     */
+    private function find(string $glob): Promise
+    {
+        return $this->client->workspace->xfiles()->then(function (array $textDocuments) {
+            $uris = [];
+            foreach ($textDocuments as $textDocument) {
+                $path = Uri\parse($textDocument->uri)['path'];
+                if (Glob::match($path, $pattern)) {
+                    $uris[] = $textDocument->uri;
+                }
+            }
+            return $uris;
+        });
+    }
+}
diff --git a/src/FilesFinder/FileSystemFilesFinder.php b/src/FilesFinder/FileSystemFilesFinder.php
new file mode 100644
index 0000000..5cf3541
--- /dev/null
+++ b/src/FilesFinder/FileSystemFilesFinder.php
@@ -0,0 +1,30 @@
+<?php
+declare(strict_types = 1);
+
+namespace LanguageServer\FilesFinder;
+
+use Sabre\Event\Promise;
+use function LanguageServer\{uriToPath, timeout};
+use Webmozart\Glob\Iterator\GlobIterator;
+
+class FileSystemFindFinder implements FilesFinder
+{
+    /**
+     * Returns all files in the workspace that match a glob.
+     * If the client does not support workspace/files, it falls back to searching the file system directly.
+     *
+     * @param string $glob
+     * @return Promise <string[]>
+     */
+    public function find(string $glob): Promise
+    {
+        return coroutine(function () use ($glob) {
+            $uris = [];
+            foreach (new GlobIterator($pattern) as $path) {
+                $uris[] = pathToUri($path);
+                yield timeout();
+            }
+            return $uris;
+        });
+    }
+}
diff --git a/src/FilesFinder/FilesFinder.php b/src/FilesFinder/FilesFinder.php
new file mode 100644
index 0000000..9822856
--- /dev/null
+++ b/src/FilesFinder/FilesFinder.php
@@ -0,0 +1,21 @@
+<?php
+declare(strict_types = 1);
+
+namespace LanguageServer\ContentRetriever;
+
+use Sabre\Event\Promise;
+
+/**
+ * Interface for retrieving the content of a text document
+ */
+interface FilesFinder
+{
+    /**
+     * Returns all files in the workspace that match a glob.
+     * If the client does not support workspace/files, it falls back to searching the file system directly.
+     *
+     * @param string $glob
+     * @return Promise <string[]>
+     */
+    public function find(string $glob): Promise;
+}
diff --git a/src/LanguageServer.php b/src/LanguageServer.php
index 42a1b64..d579bf5 100644
--- a/src/LanguageServer.php
+++ b/src/LanguageServer.php
@@ -14,13 +14,12 @@ use LanguageServer\Protocol\{
     TextDocumentIdentifier,
     CompletionOptions
 };
+use LanguageServer\FilesFinder\{FilesFinder, ClientFilesFinder, FileSystemFilesFinder};
 use AdvancedJsonRpc;
 use Sabre\Event\{Loop, Promise};
 use function Sabre\Event\coroutine;
 use Exception;
 use Throwable;
-use Webmozart\Glob\Iterator\GlobIterator;
-use Webmozart\Glob\Glob;
 use Webmozart\PathUtil\Path;
 use Sabre\Uri;
 
@@ -62,6 +61,11 @@ class LanguageServer extends AdvancedJsonRpc\Dispatcher
     private $rootPath;
     private $project;
 
+    /**
+     * @var FilesFinder
+     */
+    private $filesFinder;
+
     public function __construct(ProtocolReader $reader, ProtocolWriter $writer)
     {
         parent::__construct($this, '/');
@@ -107,6 +111,11 @@ class LanguageServer extends AdvancedJsonRpc\Dispatcher
         });
         $this->protocolWriter = $writer;
         $this->client = new LanguageClient($reader, $writer);
+        if ($this->clientCapabilities->xfilesProvider) {
+            $this->filesFinder = new ClientFilesFinder($this->client);
+        } else {
+            $this->filesFinder = new FileSystemFilesFinder;
+        }
     }
 
     /**
@@ -183,7 +192,8 @@ class LanguageServer extends AdvancedJsonRpc\Dispatcher
     private function indexProject(): Promise
     {
         return coroutine(function () {
-            $textDocuments = yield $this->findPhpFiles();
+            $pattern = Path::makeAbsolute('**/*.php', $this->rootPath);
+            $textDocuments = yield $this->filesFinder->find($pattern);
             $count = count($textDocuments);
 
             $startTime = microtime(true);
@@ -219,33 +229,4 @@ class LanguageServer extends AdvancedJsonRpc\Dispatcher
         });
     }
 
-    /**
-     * Returns all PHP files in the workspace.
-     * If the client does not support workspace/files, it falls back to searching the file system directly.
-     *
-     * @return Promise <TextDocumentIdentifier[]>
-     */
-    private function findPhpFiles(): Promise
-    {
-        return coroutine(function () {
-            $textDocuments = [];
-            $pattern = Path::makeAbsolute('**/*.php', $this->rootPath);
-            if ($this->clientCapabilities->xfilesProvider) {
-                // Use xfiles request
-                foreach (yield $this->client->workspace->xfiles() as $textDocument) {
-                    $path = Uri\parse($textDocument->uri)['path'];
-                    if (Glob::match($path, $pattern)) {
-                        $textDocuments[] = $textDocument;
-                    }
-                }
-            } else {
-                // Use the file system
-                foreach (new GlobIterator($pattern) as $path) {
-                    $textDocuments[] = new TextDocumentIdentifier(pathToUri($path));
-                    yield timeout();
-                }
-            }
-            return $textDocuments;
-        });
-    }
 }