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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 http://www.qt.io/terms-conditions. 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.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
#ifndef Patternist_Tokenizer_H
#define Patternist_Tokenizer_H
#include <QPair>
#include <QSharedData>
#include <QString>
#include <QUrl>
#include <private/qparsercontext_p.h>
#include <private/qtokensource_p.h>
#include <private/qtokenvalue_p.h>
/**
* Macro for the data type of semantic values; int by default.
* See section Data Types of Semantic Values.
*/
#define YYSTYPE QPatternist::TokenValue
#include <private/qquerytransformparser_p.h> /* This inclusion must be after TokenValue. */
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Base class for all tokenizers.
*
* The main entry point is nextToken(), which ones calls to retrieve the stream
* of tokens this Tokenizer delivers.
*
* @see <a href="http://www.w3.org/TR/xquery-xpath-parsing/">Building a
* Tokenizer for XPath or XQuery</a>
* @author Frans Englich <frans.englich@nokia.com>
*/
class Tokenizer : public TokenSource
{
public:
inline Tokenizer(const QUrl &queryU) : m_queryURI(queryU)
{
Q_ASSERT(queryU.isValid());
}
typedef QExplicitlySharedDataPointer<Tokenizer> Ptr;
/**
* Switches the Tokenizer to only do scanning, and returns complete
* strings for attribute value templates as opposed to the tokens for
* the contained expressions.
*
* The current position in the stream is returned. It can be used to
* later resume regular tokenization.
*/
virtual int commenceScanOnly() = 0;
/**
* Resumes regular parsing from @p position. The tokenizer must be in
* the scan-only state, which the commenceScanOnly() call transists to.
*
* The tokenizer will return the token POSITION_SET once after this
* function has been called.
*/
virtual void resumeTokenizationFrom(const int position) = 0;
/**
* @returns the URI of the resource being tokenized.
*/
inline const QUrl &queryURI() const
{
return m_queryURI;
}
virtual void setParserContext(const ParserContext::Ptr &parseInfo) = 0;
protected:
/**
* Returns a string representation of @p token.
*
* This function is used for debugging purposes. The implementation of
* this function is in querytransformparser.ypp.
*/
static QString tokenToString(const Token &token);
private:
Q_DISABLE_COPY(Tokenizer)
const QUrl m_queryURI;
};
}
#undef Patternist_DEBUG_PARSER // disable it for now
QT_END_NAMESPACE
#endif
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