Introduce CurrentSymbolsRequestTask

It's going to be used as task item inside a filter for
LanguageClient::DocumentLocatorFilter.

Change-Id: Icf091af83e9e6979628a7c01f3fcc5bd4cd95a9a
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/languageclient/currentdocumentsymbolsrequesttask.cpp

@@ -0,0 +1,83 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "currentdocumentsymbolsrequesttask.h"
+
+#include "documentsymbolcache.h"
+#include "languageclientmanager.h"
+
+#include <coreplugin/editormanager/editormanager.h>
+
+using namespace Core;
+using namespace LanguageServerProtocol;
+using namespace TextEditor;
+using namespace Utils;
+
+namespace LanguageClient {
+
+void CurrentDocumentSymbolsRequestTask::start()
+{
+    QTC_ASSERT(!isRunning(), return);
+
+    m_currentDocumentSymbolsData = {};
+
+    TextDocument *document = TextDocument::currentTextDocument();
+    Client *client = LanguageClientManager::clientForDocument(document);
+    if (!client) {
+        emit done(false);
+        return;
+    }
+
+    DocumentSymbolCache *symbolCache = client->documentSymbolCache();
+    DocumentUri currentUri = client->hostPathToServerUri(document->filePath());
+    DocumentUri::PathMapper pathMapper = client->hostPathMapper();
+
+    const auto reportFailure = [this] {
+        clearConnections();
+        emit done(false);
+    };
+
+    const auto updateSymbols = [this, currentUri, pathMapper](const DocumentUri &uri,
+                                                              const DocumentSymbolsResult &symbols)
+    {
+        if (uri != currentUri) // We might get updates for not current editor
+            return;
+
+        const FilePath filePath = pathMapper ? currentUri.toFilePath(pathMapper) : FilePath();
+        m_currentDocumentSymbolsData = {filePath, pathMapper, symbols};
+        clearConnections();
+        emit done(true);
+    };
+
+    m_connections.append(connect(EditorManager::instance(), &EditorManager::currentEditorChanged,
+                                 this, reportFailure));
+    m_connections.append(connect(client, &Client::finished, this, reportFailure));
+    m_connections.append(connect(document, &IDocument::contentsChanged, this, reportFailure));
+    m_connections.append(connect(symbolCache, &DocumentSymbolCache::gotSymbols,
+                                 this, updateSymbols));
+    symbolCache->requestSymbols(currentUri, Schedule::Now);
+}
+
+bool CurrentDocumentSymbolsRequestTask::isRunning() const
+{
+    return !m_connections.isEmpty();
+}
+
+void CurrentDocumentSymbolsRequestTask::clearConnections()
+{
+    for (const QMetaObject::Connection &connection : std::as_const(m_connections))
+        disconnect(connection);
+    m_connections.clear();
+}
+
+CurrentDocumentSymbolsRequestTaskAdapter::CurrentDocumentSymbolsRequestTaskAdapter()
+{
+    connect(task(), &CurrentDocumentSymbolsRequestTask::done, this, &TaskInterface::done);
+}
+
+void CurrentDocumentSymbolsRequestTaskAdapter::start()
+{
+    task()->start();
+}
+
+} // namespace LanguageClient