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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 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_VariableDeclaration_H
#define Patternist_VariableDeclaration_H
#include <QSharedData>
#include "qexpression_p.h"
#include "qpatternistlocale_p.h"
#include "qvariablereference_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
template<typename T> class QStack;
namespace QPatternist
{
/**
* @short Represents a declared variable. Only used at
* the compilation stage.
*
* @see FunctionArgument
* @author Frans Englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class VariableDeclaration : public QSharedData
{
public:
typedef QExplicitlySharedDataPointer<VariableDeclaration> Ptr;
typedef QStack<VariableDeclaration::Ptr> Stack;
typedef QList<VariableDeclaration::Ptr> List;
/**
* @short The key is the variable name.
*/
typedef QHash<QXmlName, VariableDeclaration::Ptr> Hash;
enum Type
{
RangeVariable,
ExpressionVariable,
FunctionArgument,
PositionalVariable,
TemplateParameter,
/**
* A global variable is always an external variable, but it is
* cached differently.
*
* @see DynamicContext::globalItemCacheCell()
*/
GlobalVariable,
/**
* External variables doesn't use slots, that's a big difference
* compared to the other types.
*/
ExternalVariable
};
/**
* Creates a VariableDeclaration.
*
* @p sourceExpr and @p seqType may be @c null.
*/
VariableDeclaration(const QXmlName n,
const VariableSlotID varSlot,
const Type t,
const SequenceType::Ptr &seqType) : name(n)
, slot(varSlot)
, type(t)
, sequenceType(seqType)
, canSourceRewrite(true)
{
Q_ASSERT(!name.isNull());
Q_ASSERT(t == ExternalVariable || t == TemplateParameter || varSlot > -1);
}
inline bool isUsed() const
{
return !references.isEmpty();
}
inline const Expression::Ptr &expression() const
{
return m_expression;
}
inline void setExpression(const Expression::Ptr &expr)
{
m_expression = expr;
}
/**
* @short Returns how many times this variable is used.
*/
inline bool usedByMany() const
{
return references.count() > 1;
}
/**
* @short Returns @c true if @p list contains @p lookup.
*/
static bool contains(const VariableDeclaration::List &list,
const QXmlName &lookup);
const QXmlName name;
const VariableSlotID slot;
const Type type;
/**
* The declared type of the variable. What the value might be, depends
* on the context which VariableDeclaration is used in. Note that
* sequenceType is hence not in anyway obligated to the type of
* expression().
*/
const SequenceType::Ptr sequenceType;
VariableReference::List references;
/**
* @short Whether a reference can rewrite itself to expression().
*
* The default value is @c true.
*/
bool canSourceRewrite;
private:
Expression::Ptr m_expression;
Q_DISABLE_COPY(VariableDeclaration)
};
/**
* @short Formats @p var appropriately for display.
*
* @relates VariableDeclaration
*/
static inline QString formatKeyword(const VariableDeclaration::Ptr &var,
const NamePool::Ptr &np)
{
Q_ASSERT(var);
Q_ASSERT(np);
return formatKeyword(np->displayName(var->name));
}
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
|
