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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
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**
****************************************************************************/
//
// 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_TokenSource_H
#define Patternist_TokenSource_H
#include <private/qfunctionargument_p.h>
#include <private/qitem_p.h>
#include <private/qitemtype_p.h>
#include <private/qtokenvalue_p.h>
#include <private/qparsercontext_p.h>
#include <private/qquerytransformparser_p.h>
QT_BEGIN_NAMESPACE
template<typename T> class QQueue;
namespace QPatternist
{
/**
* @short Base class for components that needs to return tokens.
*
* TokenSource represents a stream of Token instances. The end
* is reached when readNext() returns a Token constructed with
* END_OF_FILE.
*
* @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 TokenSource : public QSharedData
{
public:
/**
* typedef for the enum Bison generates that contains
* the token symbols.
*/
typedef XPathtokentype TokenType;
/**
* Represents a token by carrying its name and value.
*/
class Token
{
public:
/**
* Constructs an invalid Token. This default constructor
* is need in Qt's container classes.
*/
inline Token() {}
inline Token(const TokenType t) : type(t) {}
inline Token(const TokenType t, const QString &val) : type(t), value(val) {}
bool hasError() const
{
return type == T_ERROR;
}
TokenType type;
QString value;
};
typedef QExplicitlySharedDataPointer<TokenSource> Ptr;
typedef QQueue<Ptr> Queue;
/**
* The C++ compiler cannot synthesize it when we use the
* Q_DISABLE_COPY() macro.
*/
inline TokenSource()
{
}
virtual ~TokenSource();
/**
* @returns the next token.
*/
virtual Token nextToken(XPATHLTYPE *const sourceLocator) = 0;
private:
Q_DISABLE_COPY(TokenSource)
};
}
QT_END_NAMESPACE
#endif
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