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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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_ExpressionFactory_H
#define Patternist_ExpressionFactory_H
#include <QXmlQuery>
#include "qexpression_p.h"
#include "qtokenizer_p.h"
#include <QSharedData>
#include <QUrl>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
class QIODevice;
namespace QPatternist
{
/**
* @short The central entry point for compiling expressions.
*
* @ingroup Patternist_expressions
* @author Frans Englich <frans.englich@nokia.com>
*/
class Q_AUTOTEST_EXPORT ExpressionFactory : public QSharedData
{
public:
typedef QExplicitlySharedDataPointer<ExpressionFactory> Ptr;
/**
* @short This constructor cannot be synthesized since we
* use the Q_DISABLE_COPY macro.
*/
inline ExpressionFactory()
{
}
virtual ~ExpressionFactory()
{
}
enum CompilationStage
{
QueryBodyInitial = 1,
QueryBodyTypeCheck = 1 << 1,
QueryBodyCompression = 1 << 2,
UserFunctionTypeCheck = 1 << 3,
UserFunctionCompression = 1 << 4,
GlobalVariableTypeCheck = 1 << 5
};
/**
* Creates a compiled representation of the XPath expression @p expr, with Static
* Context information supplied via @p context. This is for example whether the expression
* is an XPath 1.0 or XPath 2.0 expression, or what functions that are available.
*
* @p requiredType specifies what type results of the evaluating the expression
* must match. Passing CommonValues::ZeroOrMoreItems allows anything as result, while
* passing CommonSequenceTypes::EBV means anything but an Effective %Boolean Value extractable
* result is a type error, for example.
*
* @note An empty @p expr is an invalid XPath expression. It will be reported as such,
* but it is neverthless the caller's resonsibility to ensure that it's not that(since
* it is likely invalid already in the medium it was stored).
*/
virtual Expression::Ptr createExpression(const QString &expr,
const StaticContext::Ptr &context,
const QXmlQuery::QueryLanguage lang,
const SequenceType::Ptr &requiredType,
const QUrl &queryURI,
const QXmlName &initialTemplateName);
virtual Expression::Ptr createExpression(QIODevice *const device,
const StaticContext::Ptr &context,
const QXmlQuery::QueryLanguage lang,
const SequenceType::Ptr &requiredType,
const QUrl &queryURI,
const QXmlName &initialTemplateName);
/**
* Finds the last paths of a set of paths(if any) and tells the Path
* so, such that it can generate the code for checking XPTY0018.
*
* Must be called before typeCheck() is called on the operand, since
* the typeCheck() uses the information for type checking.
*/
static void registerLastPath(const Expression::Ptr &operand);
protected:
enum TemplateCompilationStage
{
TemplateInitial = 1,
TemplateTypeCheck = 1 << 1,
TemplateCompress = 1 << 2
};
/**
* This function is called by createExpression() each time
* after a pass on the AST has been completed. Under a typical
* compilation this function is thus called three times: after the initial
* build, after the Expression::typeCheck() stage, and after
* Expression::compress(). @p tree is the AST after each pass.
*
* This mechanism is currently used for debugging, since it provides a
* way of introspecting what the compilation process do to the tree. The
* current implementation do nothing.
*/
virtual void processTreePass(const Expression::Ptr &tree,
const CompilationStage stage);
virtual void processTemplateRule(const Expression::Ptr &body,
const TemplatePattern::Ptr &pattern,
const QXmlName &mode,
const TemplateCompilationStage stage);
virtual void processNamedTemplate(const QXmlName &name,
const Expression::Ptr &tree,
const TemplateCompilationStage stage);
Expression::Ptr createExpression(const Tokenizer::Ptr &tokenizer,
const StaticContext::Ptr &context,
const QXmlQuery::QueryLanguage lang,
const SequenceType::Ptr &requiredType,
const QUrl &queryURI,
const QXmlName &initialTemplateName);
private:
Q_DISABLE_COPY(ExpressionFactory)
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
|
