Move CanonicalSymbol from CppEditor to CppTools

Needed for a follow-up change.

Change-Id: Ibb4815f3411f0d63deac8c32583178470668f67b
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/cpptools/cppcanonicalsymbol.h

@@ -0,0 +1,62 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 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 "cpptools_global.h"
+
+#include <cplusplus/LookupContext.h>
+#include <cplusplus/Symbol.h>
+#include <cplusplus/TypeOfExpression.h>
+
+QT_FORWARD_DECLARE_CLASS(QTextCursor)
+
+namespace CppTools {
+
+class CPPTOOLS_EXPORT CanonicalSymbol
+{
+public:
+    CanonicalSymbol(const CPlusPlus::Document::Ptr &document,
+                    const CPlusPlus::Snapshot &snapshot);
+
+    const CPlusPlus::LookupContext &context() const;
+
+    CPlusPlus::Scope *getScopeAndExpression(const QTextCursor &cursor, QString *code);
+
+    CPlusPlus::Symbol *operator()(const QTextCursor &cursor);
+    CPlusPlus::Symbol *operator()(CPlusPlus::Scope *scope, const QString &code);
+
+public:
+    static CPlusPlus::Symbol *canonicalSymbol(CPlusPlus::Scope *scope,
+                                              const QString &code,
+                                              CPlusPlus::TypeOfExpression &typeOfExpression);
+
+private:
+    CPlusPlus::Document::Ptr m_document;
+    CPlusPlus::Snapshot m_snapshot;
+    CPlusPlus::TypeOfExpression m_typeOfExpression;
+};
+
+} // namespace CppTools