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diff --git a/Userland/DevTools/HackStudio/LanguageServers/Cpp/ClientConnection.cpp b/Userland/DevTools/HackStudio/LanguageServers/Cpp/ClientConnection.cpp
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index 0000000000..7952696b60
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+++ b/Userland/DevTools/HackStudio/LanguageServers/Cpp/ClientConnection.cpp
@@ -0,0 +1,177 @@
+/*
+ * 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.
+ */
+
+#include "ClientConnection.h"
+#include "AutoComplete.h"
+#include <AK/HashMap.h>
+#include <LibCore/File.h>
+#include <LibGUI/TextDocument.h>
+
+// #define DEBUG_CPP_LANGUAGE_SERVER
+// #define DEBUG_FILE_CONTENT
+
+namespace LanguageServers::Cpp {
+
+static HashMap<int, RefPtr<ClientConnection>> s_connections;
+
+ClientConnection::ClientConnection(NonnullRefPtr<Core::LocalSocket> socket, int client_id)
+    : IPC::ClientConnection<LanguageClientEndpoint, LanguageServerEndpoint>(*this, move(socket), client_id)
+{
+    s_connections.set(client_id, *this);
+}
+
+ClientConnection::~ClientConnection()
+{
+}
+
+void ClientConnection::die()
+{
+    s_connections.remove(client_id());
+    exit(0);
+}
+
+OwnPtr<Messages::LanguageServer::GreetResponse> ClientConnection::handle(const Messages::LanguageServer::Greet&)
+{
+    return make<Messages::LanguageServer::GreetResponse>(client_id());
+}
+
+class DefaultDocumentClient final : public GUI::TextDocument::Client {
+public:
+    virtual ~DefaultDocumentClient() override = default;
+    virtual void document_did_append_line() override {};
+    virtual void document_did_insert_line(size_t) override {};
+    virtual void document_did_remove_line(size_t) override {};
+    virtual void document_did_remove_all_lines() override {};
+    virtual void document_did_change() override {};
+    virtual void document_did_set_text() override {};
+    virtual void document_did_set_cursor(const GUI::TextPosition&) override {};
+
+    virtual bool is_automatic_indentation_enabled() const override { return false; }
+    virtual int soft_tab_width() const override { return 4; }
+};
+
+static DefaultDocumentClient s_default_document_client;
+
+void ClientConnection::handle(const Messages::LanguageServer::FileOpened& message)
+{
+    auto file = Core::File::construct(this);
+    if (!file->open(message.file().fd(), Core::IODevice::ReadOnly, Core::File::ShouldCloseFileDescriptor::Yes)) {
+        errno = file->error();
+        perror("open");
+        dbgln("Failed to open project file");
+        return;
+    }
+    auto content = file->read_all();
+    StringView content_view(content);
+    auto document = GUI::TextDocument::create(&s_default_document_client);
+    document->set_text(content_view);
+    m_open_files.set(message.file_name(), document);
+#ifdef DEBUG_FILE_CONTENT
+    dbg() << document->text();
+#endif
+}
+
+void ClientConnection::handle(const Messages::LanguageServer::FileEditInsertText& message)
+{
+#ifdef DEBUG_CPP_LANGUAGE_SERVER
+    dbgln("InsertText for file: {}", message.file_name());
+    dbgln("Text: {}", message.text());
+    dbgln("[{}:{}]", message.start_line(), message.start_column());
+#endif
+    auto document = document_for(message.file_name());
+    if (!document) {
+        dbgln("file {} has not been opened", message.file_name());
+        return;
+    }
+    GUI::TextPosition start_position { (size_t)message.start_line(), (size_t)message.start_column() };
+    document->insert_at(start_position, message.text(), &s_default_document_client);
+#ifdef DEBUG_FILE_CONTENT
+    dbgln("{}", document->text());
+#endif
+}
+
+void ClientConnection::handle(const Messages::LanguageServer::FileEditRemoveText& message)
+{
+#ifdef DEBUG_CPP_LANGUAGE_SERVER
+    dbgln("RemoveText for file: {}", message.file_name());
+    dbgln("[{}:{} - {}:{}]", message.start_line(), message.start_column(), message.end_line(), message.end_column());
+#endif
+    auto document = document_for(message.file_name());
+    if (!document) {
+        dbgln("file {} has not been opened", message.file_name());
+        return;
+    }
+    GUI::TextPosition start_position { (size_t)message.start_line(), (size_t)message.start_column() };
+    GUI::TextRange range {
+        GUI::TextPosition { (size_t)message.start_line(),
+            (size_t)message.start_column() },
+        GUI::TextPosition { (size_t)message.end_line(),
+            (size_t)message.end_column() }
+    };
+
+    document->remove(range);
+#ifdef DEBUG_FILE_CONTENT
+    dbgln("{}", document->text());
+#endif
+}
+
+void ClientConnection::handle(const Messages::LanguageServer::AutoCompleteSuggestions& message)
+{
+#ifdef DEBUG_CPP_LANGUAGE_SERVER
+    dbgln("AutoCompleteSuggestions for: {} {}:{}", message.file_name(), message.cursor_line(), message.cursor_column());
+#endif
+
+    auto document = document_for(message.file_name());
+    if (!document) {
+        dbgln("file {} has not been opened", message.file_name());
+        return;
+    }
+
+    auto suggestions = AutoComplete::get_suggestions(document->text(), { (size_t)message.cursor_line(), (size_t)max(message.cursor_column(), message.cursor_column() - 1) });
+    post_message(Messages::LanguageClient::AutoCompleteSuggestions(move(suggestions)));
+}
+
+RefPtr<GUI::TextDocument> ClientConnection::document_for(const String& file_name)
+{
+    auto document_optional = m_open_files.get(file_name);
+    if (!document_optional.has_value())
+        return nullptr;
+
+    return document_optional.value();
+}
+
+void ClientConnection::handle(const Messages::LanguageServer::SetFileContent& message)
+{
+    auto document = document_for(message.file_name());
+    if (!document) {
+        dbgln("file {} has not been opened", message.file_name());
+        return;
+    }
+    auto content = message.content();
+    document->set_text(content.view());
+}
+
+}