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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** 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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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_OptimizerBlocks_H
#define Patternist_OptimizerBlocks_H
#include "qatomiccomparator_p.h"
#include "qexpression_p.h"
#include "qoptimizerframework_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Identifies Expression instances by their Expression::id().
*
* @author Frans englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class ByIDIdentifier : public ExpressionIdentifier
{
public:
ByIDIdentifier(const Expression::ID id);
virtual bool matches(const Expression::Ptr &expr) const;
private:
const Expression::ID m_id;
};
/**
* @short Identifies Expression instances based on their static type.
*
* BySequenceTypeIdentifier identifies Expression instances
* if their Expression::staticType() matches the requested one,
* regardless of whether the Expression is a particular one, such
* as AndExpression.
*
* For example, constructing a BySequenceTypeIdentifier while
* passing CommonSequenceTypes::EBV in its constructor will create
* a ExpressionIdentifier that returns @c true for a static type with
* item type <tt>xs:string</tt>, but returns @c false for a static type involving
* <tt>xs:date</tt>.
*
* @author Frans englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class BySequenceTypeIdentifier : public ExpressionIdentifier
{
public:
BySequenceTypeIdentifier(const SequenceType::Ptr &seqType);
/**
* @returns @c true, if the static type of @p expr is matches
* the SequenceType passed in the BySequenceTypeIdentifier()
* constructor, otherwise @c false.
*/
virtual bool matches(const Expression::Ptr &expr) const;
private:
const SequenceType::Ptr m_seqType;
};
/**
* @short Determines whether an Expression is a value or general comparison or both,
* with a certain operator.
*
* @author Frans englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class ComparisonIdentifier : public ExpressionIdentifier
{
public:
/**
* @param comparatorHosts the possible parent that may have
* the operator. This may be Expression::IDGeneralComparison or
* Expression::IDValueComparison. The two values may also be OR'd,
* meaning any of them will do.
*
* @param op the operator that the comparator host must have. For example,
* if @p op is AtomicComparator::OperatorGreatorOrEqual this ComparisonIdentifier
* will match operator >= in the case of IDGeneralComparison and 'ge' in the
* case of IDValueComparison.
*/
ComparisonIdentifier(const QVector<Expression::ID> comparatorHosts,
const AtomicComparator::Operator op);
/**
* @returns @c true, if @p expr is a ValueComparison with the operator
* passed in ComparisonIdentifier().
*/
virtual bool matches(const Expression::Ptr &expr) const;
private:
const QVector<Expression::ID> m_hosts;
const AtomicComparator::Operator m_op;
};
/**
* @short Matches numeric literals that are of type xs:integer and
* has a specific value.
*
* For example IntegerIdentifier(4) would match the former but
* not the latter operand in this expression: "4 + 5".
*
* @author Frans englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class IntegerIdentifier : public ExpressionIdentifier
{
public:
IntegerIdentifier(const xsInteger num);
virtual bool matches(const Expression::Ptr &expr) const;
private:
const xsInteger m_num;
};
/**
* @short Matches boolean literals.
*
* For example BooleanIdentifier(true) would match the former but
* not the latter operand in this expression: "true() + false()".
*
* @author Frans englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class BooleanIdentifier : public ExpressionIdentifier
{
public:
BooleanIdentifier(const bool value);
virtual bool matches(const Expression::Ptr &expr) const;
private:
const bool m_value;
};
/**
* @short Creates a particular Expression instance identified by an Expression::ID.
*
* For example, if ByIDCreator() is passed Expression::IDCountFN, create()
* will return CountFN instances.
*
* @author Frans englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class ByIDCreator : public ExpressionCreator
{
public:
/**
* Creates a ByIDCreator that creates expressions
* of the type that @p id identifies.
*/
ByIDCreator(const Expression::ID id);
virtual Expression::Ptr create(const Expression::List &operands,
const StaticContext::Ptr &context,
const SourceLocationReflection *const r) const;
/**
* Creates an expression by id @p id with the arguments @p operands.
*/
static Expression::Ptr create(const Expression::ID id,
const Expression::List &operands,
const StaticContext::Ptr &context,
const SourceLocationReflection *const r);
private:
const Expression::ID m_id;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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