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/****************************************************************************
**
** Copyright (C) 2009 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_UserFunctionCallsite_H
#define Patternist_UserFunctionCallsite_H
#include "qcallsite_p.h"
#include "qfunctionsignature_p.h"
#include "qunlimitedcontainer_p.h"
#include "quserfunction_p.h"
#include "qvariabledeclaration_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Performs a call to a UserFunction.
*
* UserFunctionCallsite is the call site to a function that has been
* declared in the query using <tt>declare function</tt>. That is, it is
* never used for builtin functions such as <tt>fn:count()</tt>.
*
* @see UserFunction
* @see ArgumentReference
* @author Frans Englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class UserFunctionCallsite : public CallSite
{
public:
typedef QExplicitlySharedDataPointer<UserFunctionCallsite> Ptr;
typedef QList<UserFunctionCallsite::Ptr> List;
UserFunctionCallsite(const QXmlName name,
const FunctionSignature::Arity arity);
virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;
virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
virtual void evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const;
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType);
/**
* We call compress on our body.
*/
virtual Expression::Ptr compress(const StaticContext::Ptr &context);
virtual Expression::Properties properties() const;
/**
* @short Returns the types declared in the function declaration.
*
* @see CallTemplate::expectedOperandTypes()
*/
virtual SequenceType::List expectedOperandTypes() const;
virtual SequenceType::Ptr staticType() const;
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
/**
* @returns always IDUserFunctionCallsite.
*/
virtual ID id() const;
/**
* If @p slotOffset is -1, it means this function has no arguments.
*/
void setSource(const UserFunction::Ptr &userFunction,
const VariableSlotID cacheSlotOffset);
/**
* @returns @c true, if a function definition with signature @p sign
* would be valid to call from this callsite, otherwise @c false.
*/
bool isSignatureValid(const FunctionSignature::Ptr &sign) const;
FunctionSignature::Arity arity() const;
inline Expression::Ptr body() const
{
return m_body;
}
virtual bool configureRecursion(const CallTargetDescription::Ptr &sign);
virtual CallTargetDescription::Ptr callTargetDescription() const;
private:
/**
* Creates a new context sets the arguments, and returns it.
*/
DynamicContext::Ptr bindVariables(const DynamicContext::Ptr &context) const;
const FunctionSignature::Arity m_arity;
/**
* The reason this variable, as well as others, aren't const, is that
* the binding to the actual function, is resolved after this
* UserFunctionCallsite has been created.
*/
VariableSlotID m_expressionSlotOffset;
/**
* @note This may be different from m_functionDeclaration->body(). It
* may differ on a per-callsite basis.
*/
Expression::Ptr m_body;
UserFunction::Ptr m_functionDeclaration;
};
/**
* @short Formats UserFunctionCallsite.
*
* @relates UserFunctionCallsite
*/
static inline QString formatFunction(const UserFunctionCallsite::Ptr &func)
{
Q_UNUSED(func);
// TODO TODO TODO
// TODO Make UserFunctionCallsite always use a FunctionSignature
return QLatin1String("<span class='XQuery-function'>") +
QString() +
//escape(func->name()->toString()) +
QLatin1String("</span>");
}
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
|
