CppTools: Extract base class CppCompletionAssistProcessor

As as side effect, this also brings some more pragma completions for the
builtin-in completion engine, e.g. "pragma once" or "pragma omp atomic".

Change-Id: If3ef22076c331c653b78a87cfff836c1da38c8fb
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>

src/plugins/cpptools/cppcompletionassistprocessor.h

@@ -0,0 +1,63 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://www.qt.io/licensing.  For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifndef CPPCOMPLETIONASSISTPROCESSOR_H
+#define CPPCOMPLETIONASSISTPROCESSOR_H
+
+#include "cpptools_global.h"
+
+#include <texteditor/codeassist/iassistprocessor.h>
+#include <texteditor/snippets/snippetassistcollector.h>
+
+#include <cplusplus/Icons.h>
+
+namespace CppTools {
+
+class CPPTOOLS_EXPORT CppCompletionAssistProcessor : public TextEditor::IAssistProcessor
+{
+public:
+    CppCompletionAssistProcessor();
+
+protected:
+    void addSnippets();
+
+    int m_startPosition;
+    QList<TextEditor::AssistProposalItem *> m_completions;
+    QStringList m_preprocessorCompletions;
+    TextEditor::IAssistProposal *m_hintProposal;
+    CPlusPlus::Icons m_icons;
+
+private:
+    TextEditor::SnippetAssistCollector m_snippetCollector;
+};
+
+} // namespace CppTools
+
+#endif // CPPCOMPLETIONASSISTPROCESSOR_H