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/****************************************************************************
**
** Copyright (C) 2014 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.
**
****************************************************************************/

#include "ASTParent.h"

#include <cplusplus/AST.h>

using namespace CPlusPlus;

ASTParent::ASTParent(TranslationUnit *translationUnit, AST *rootNode)
    : ASTVisitor(translationUnit)
{
    accept(rootNode);
}

ASTParent::~ASTParent()
{ }

AST *ASTParent::operator()(AST *ast) const
{ return parent(ast); }

AST *ASTParent::parent(AST *ast) const
{ return _parentMap.value(ast); }

bool ASTParent::preVisit(AST *ast)
{
    if (! _parentStack.isEmpty())
        _parentMap.insert(ast, _parentStack.top());

    _parentStack.push(ast);

    return true;
}

QList<AST *> ASTParent::path(AST *ast) const
{
    QList<AST *> path;
    path_helper(ast, &path);
    return path;
}

void ASTParent::path_helper(AST *ast, QList<AST *> *path) const
{
    if (! ast)
        return;

    path_helper(parent(ast), path);
    path->append(ast);
}

void ASTParent::postVisit(AST *)
{ _parentStack.pop(); }