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/****************************************************************************
**
** 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.
**
****************************************************************************/
#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:
BackwardsScanner(const QTextCursor &cursor,
const LanguageFeatures &languageFeatures,
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:
Tokens _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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