HackStudio/LanguageServers: Move some components out of Cpp

This makes them available for use by other language servers.
Also as a bonus, update the Shell language server to discover some
symbols and add go-to-definition functionality :^)

Userland/DevTools/HackStudio/LanguageServers/ClientConnection.cpp

@@ -0,0 +1,150 @@
+/*
+ * 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 <AK/Debug.h>
+#include <AK/HashMap.h>
+#include <LibCore/File.h>
+#include <LibGUI/TextDocument.h>
+
+namespace LanguageServers {
+
+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& message)
+{
+    m_filedb.set_project_root(message.project_root());
+    if (unveil(message.project_root().characters(), "r") < 0) {
+        perror("unveil");
+        exit(1);
+    }
+    if (unveil(nullptr, nullptr) < 0) {
+        perror("unveil");
+        exit(1);
+    }
+    return make<Messages::LanguageServer::GreetResponse>();
+}
+
+void ClientConnection::handle(const Messages::LanguageServer::FileOpened& message)
+{
+    if (m_filedb.is_open(message.file_name())) {
+        return;
+    }
+    m_filedb.add(message.file_name(), message.file().take_fd());
+    m_autocomplete_engine->file_opened(message.file_name());
+}
+
+void ClientConnection::handle(const Messages::LanguageServer::FileEditInsertText& message)
+{
+#if CPP_LANGUAGE_SERVER_DEBUG
+    dbgln("InsertText for file: {}", message.file_name());
+    dbgln("Text: {}", message.text());
+    dbgln("[{}:{}]", message.start_line(), message.start_column());
+#endif
+    m_filedb.on_file_edit_insert_text(message.file_name(), message.text(), message.start_line(), message.start_column());
+    m_autocomplete_engine->on_edit(message.file_name());
+}
+
+void ClientConnection::handle(const Messages::LanguageServer::FileEditRemoveText& message)
+{
+#if CPP_LANGUAGE_SERVER_DEBUG
+    dbgln("RemoveText for file: {}", message.file_name());
+    dbgln("[{}:{} - {}:{}]", message.start_line(), message.start_column(), message.end_line(), message.end_column());
+#endif
+    m_filedb.on_file_edit_remove_text(message.file_name(), message.start_line(), message.start_column(), message.end_line(), message.end_column());
+    m_autocomplete_engine->on_edit(message.file_name());
+}
+
+void ClientConnection::handle(const Messages::LanguageServer::AutoCompleteSuggestions& message)
+{
+#if CPP_LANGUAGE_SERVER_DEBUG
+    dbgln("AutoCompleteSuggestions for: {} {}:{}", message.location().file, message.location().line, message.location().column);
+#endif
+
+    auto document = m_filedb.get(message.location().file);
+    if (!document) {
+        dbgln("file {} has not been opened", message.location().file);
+        return;
+    }
+
+    GUI::TextPosition autocomplete_position = { (size_t)message.location().line, (size_t)max(message.location().column, message.location().column - 1) };
+    Vector<GUI::AutocompleteProvider::Entry> suggestions = m_autocomplete_engine->get_suggestions(message.location().file, autocomplete_position);
+    post_message(Messages::LanguageClient::AutoCompleteSuggestions(move(suggestions)));
+}
+
+void ClientConnection::handle(const Messages::LanguageServer::SetFileContent& message)
+{
+    auto document = m_filedb.get(message.file_name());
+    if (!document) {
+        dbgln("file {} has not been opened", message.file_name());
+        return;
+    }
+    auto content = message.content();
+    document->set_text(content.view());
+    m_autocomplete_engine->on_edit(message.file_name());
+}
+
+void ClientConnection::handle(const Messages::LanguageServer::FindDeclaration& message)
+{
+    dbgln_if(LANGUAGE_SERVER_DEBUG, "FindDeclaration: {} {}:{}", message.location().file, message.location().line, message.location().column);
+    auto document = m_filedb.get(message.location().file);
+    if (!document) {
+        dbgln("file {} has not been opened", message.location().file);
+        return;
+    }
+
+    GUI::TextPosition identifier_position = { (size_t)message.location().line, (size_t)message.location().column };
+    auto location = m_autocomplete_engine->find_declaration_of(message.location().file, identifier_position);
+    if (!location.has_value()) {
+        dbgln("could not find declaration");
+        return;
+    }
+    dbgln_if(LANGUAGE_SERVER_DEBUG, "declaration location: {} {}:{}", location.value().file, location.value().line, location.value().column);
+    post_message(Messages::LanguageClient::DeclarationLocation(GUI::AutocompleteProvider::ProjectLocation { location.value().file, location.value().line, location.value().column }));
+}
+
+void ClientConnection::set_declarations_of_document_callback(ClientConnection& instance, const String& filename, Vector<GUI::AutocompleteProvider::Declaration>&& declarations)
+{
+    instance.post_message(Messages::LanguageClient::DeclarationsInDocument(filename, move(declarations)));
+}
+
+}