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/****************************************************************************
**
** Copyright (C) 2012 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://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: 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 CPLUSPLUS_BACKWARDSSCANNER_H
#define CPLUSPLUS_BACKWARDSSCANNER_H
#include "SimpleLexer.h"
#include <QTextBlock>
QT_FORWARD_DECLARE_CLASS(QTextCursor)
namespace CPlusPlus {
class CPLUSPLUS_EXPORT BackwardsScanner
{
enum { MAX_BLOCK_COUNT = 10 };
public:
explicit BackwardsScanner(const QTextCursor &cursor,
int maxBlockCount = MAX_BLOCK_COUNT,
const QString &suffix = QString(),
bool skipComments = true);
int startToken() const;
int startPosition() const;
QString text() const;
QString mid(int index) const;
QString text(int index) const;
QStringRef textRef(int index) const;
// 1-based
Token LA(int index) const;
// n-la token is [startToken - n]
Token operator[](int index) const; // ### deprecate
QString indentationString(int index) const;
int startOfLine(int index) const;
int startOfMatchingBrace(int index) const;
int startOfBlock(int index) const;
int size() const;
static int previousBlockState(const QTextBlock &block);
private:
const Token &fetchToken(int tokenIndex);
private:
QList<Token> _tokens;
int _offset;
int _blocksTokenized;
QTextBlock _block;
SimpleLexer _tokenize;
QString _text;
int _maxBlockCount;
int _startToken;
};
} // namespace CPlusPlus
#endif // CPLUSPLUS_BACKWARDSSCANNER_H
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