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diff --git a/Userland/DevTools/HackStudio/LanguageServers/Cpp/ClientConnection.h b/Userland/DevTools/HackStudio/LanguageServers/Cpp/ClientConnection.h
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+++ b/Userland/DevTools/HackStudio/LanguageServers/Cpp/ClientConnection.h
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+/*
+ * Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/HashMap.h>
+#include <AK/LexicalPath.h>
+#include <DevTools/HackStudio/AutoCompleteResponse.h>
+#include <LibGUI/TextDocument.h>
+#include <LibIPC/ClientConnection.h>
+
+#include <DevTools/HackStudio/LanguageServers/LanguageClientEndpoint.h>
+#include <DevTools/HackStudio/LanguageServers/LanguageServerEndpoint.h>
+
+namespace LanguageServers::Cpp {
+
+class ClientConnection final
+    : public IPC::ClientConnection<LanguageClientEndpoint, LanguageServerEndpoint>
+    , public LanguageServerEndpoint {
+    C_OBJECT(ClientConnection);
+
+public:
+    explicit ClientConnection(NonnullRefPtr<Core::LocalSocket>, int client_id);
+    ~ClientConnection() override;
+
+    virtual void die() override;
+
+private:
+    virtual OwnPtr<Messages::LanguageServer::GreetResponse> handle(const Messages::LanguageServer::Greet&) override;
+    virtual void handle(const Messages::LanguageServer::FileOpened&) override;
+    virtual void handle(const Messages::LanguageServer::FileEditInsertText&) override;
+    virtual void handle(const Messages::LanguageServer::FileEditRemoveText&) override;
+    virtual void handle(const Messages::LanguageServer::SetFileContent&) override;
+    virtual void handle(const Messages::LanguageServer::AutoCompleteSuggestions&) override;
+
+    RefPtr<GUI::TextDocument> document_for(const String& file_name);
+
+    HashMap<String, NonnullRefPtr<GUI::TextDocument>> m_open_files;
+};
+
+}