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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#ifndef CONDITIONALSTREAMREADER_H
#define CONDITIONALSTREAMREADER_H
#include <QtCore/QXmlStreamReader>
#include <utility>
QT_FORWARD_DECLARE_CLASS(QDebug)
class ProxyEntityResolver;
/// ConditionalStreamReader encapsulates QXmlStreamReader, offering the same
/// API (except readNextStartElement() and similar conveniences) and internally
/// uses Processing Instructions like:
/// <?if keyword1 !keyword2?> ... <?endif?>
/// to exclude/include sections depending on a list of condition keywords,
/// containing for example the OS.
/// It should be possible to use it as a drop-in replacement for
/// QXmlStreamReader for any parsing code based on readNext().
/// It also allows for specifying entities using a Processing Instruction:
/// <?entity name value?>
/// which can be used in conjunction with conditional processing.
class ConditionalStreamReader
{
public:
Q_DISABLE_COPY_MOVE(ConditionalStreamReader)
using TokenType = QXmlStreamReader::TokenType;
explicit ConditionalStreamReader(QIODevice *iod);
explicit ConditionalStreamReader(const QString &s);
~ConditionalStreamReader();
QIODevice *device() const { return m_reader.device(); }
// Note: Caching of entity values is done internally by
// ConditionalStreamReader.
void setEntityResolver(QXmlStreamEntityResolver *resolver);
QXmlStreamEntityResolver *entityResolver() const;
bool atEnd() const { return m_reader.atEnd(); }
TokenType readNext();
TokenType tokenType() const { return m_reader.tokenType(); }
qint64 lineNumber() const { return m_reader.lineNumber(); }
qint64 columnNumber() const { return m_reader.columnNumber(); }
QXmlStreamAttributes attributes() const { return m_reader.attributes(); }
QString readElementText(QXmlStreamReader::ReadElementTextBehaviour behaviour = QXmlStreamReader::ErrorOnUnexpectedElement)
{ return m_reader.readElementText(behaviour); }
QStringView name() const { return m_reader.name(); }
QStringView qualifiedName() const { return m_reader.qualifiedName(); }
QStringView text() const { return m_reader.text(); }
QString errorString() const { return m_reader.errorString(); }
QXmlStreamReader::Error error() const { return m_reader.error(); }
bool hasError() const { return m_reader.hasError(); }
// Additional functions (not delegating to QXmlStreamReader)
void defineEntity(const QString &name, const QString &value);
const QStringList &conditions() const { return m_conditions; }
void setConditions(const QStringList &newConditions);
static QStringList platformConditions();
private:
enum class PiTokens { None, If, Endif, EntityDefinition };
using ExtendedToken = std::pair<TokenType, PiTokens>;
ExtendedToken readNextInternal();
void init();
bool conditionMatches() const;
bool readEntityDefinitonPi();
QXmlStreamReader m_reader;
ProxyEntityResolver *m_proxyEntityResolver = nullptr;
QStringList m_conditions = ConditionalStreamReader::platformConditions();
};
QDebug operator<<(QDebug dbg, const QXmlStreamAttributes &a);
#endif // CONDITIONALSTREAMREADER_H
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