LSP: separate communication interface and client logic

Change-Id: I7d35fa634287b5f858c4a87aa10f99bf18d1ad07
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/languageclient/languageclientinterface.h

@@ -0,0 +1,96 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include <languageserverprotocol/basemessage.h>
+
+#include <QBuffer>
+#include <QProcess>
+
+namespace LanguageClient {
+
+class StdIOSettings;
+
+class BaseClientInterface : public QObject
+{
+    Q_OBJECT
+public:
+    BaseClientInterface();
+
+    virtual ~BaseClientInterface();
+
+    void sendMessage(const LanguageServerProtocol::BaseMessage &message);
+    virtual bool start() { return true; }
+
+    void resetBuffer();
+
+signals:
+    void messageReceived(LanguageServerProtocol::BaseMessage message);
+    void finished();
+    void error(const QString &message);
+
+protected:
+    virtual void sendData(const QByteArray &data) = 0;
+    void parseData(const QByteArray &data);
+
+private:
+    QBuffer m_buffer;
+    LanguageServerProtocol::BaseMessage m_currentMessage;
+};
+
+class StdIOClientInterface : public BaseClientInterface
+{
+    Q_OBJECT
+public:
+    StdIOClientInterface(const QString &executable, const QString &arguments);
+    ~StdIOClientInterface() override;
+
+    StdIOClientInterface() = delete;
+    StdIOClientInterface(const StdIOClientInterface &) = delete;
+    StdIOClientInterface(StdIOClientInterface &&) = delete;
+    StdIOClientInterface &operator=(const StdIOClientInterface &) = delete;
+    StdIOClientInterface &operator=(StdIOClientInterface &&) = delete;
+
+    bool needsRestart(const StdIOSettings *settings);
+
+    bool start() override;
+
+    void setWorkingDirectory(const QString &workingDirectory);
+
+protected:
+    void sendData(const QByteArray &data) final;
+    QProcess m_process;
+
+private:
+    void readError();
+    void readOutput();
+    void onProcessFinished(int exitCode, QProcess::ExitStatus exitStatus);
+
+    const QString m_executable;
+    const QString m_arguments;
+};
+
+} // namespace LanguageClient