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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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcontextitem_p.h"
#include "qcommonsequencetypes_p.h"
#include "qemptysequence_p.h"
#include "qfunctionsignature_p.h"
#include "qgenericsequencetype_p.h"
#include "qcollationchecker_p.h"
#include "qcommonnamespaces_p.h"
#include "qfunctioncall_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
SequenceType::List FunctionCall::expectedOperandTypes() const
{
const FunctionArgument::List args(signature()->arguments());
FunctionArgument::List::const_iterator it(args.constBegin());
const FunctionArgument::List::const_iterator end(args.constEnd());
// TODO reserve/resize()
SequenceType::List result;
for(; it != end; ++it)
result.append((*it)->type());
return result;
}
Expression::Ptr FunctionCall::typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType)
{
/* We don't cache properties() at some stages because it can be invalidated
* by the typeCheck(). */
const FunctionSignature::Arity maxArgs = signature()->maximumArguments();
/* We do this before the typeCheck() such that the appropriate conversions
* are applied to the ContextItem. */
if(m_operands.count() < maxArgs &&
has(UseContextItem))
{
m_operands.append(Expression::Ptr(new ContextItem()));
context->wrapExpressionWith(this, m_operands.last());
}
const Expression::Ptr me(UnlimitedContainer::typeCheck(context, reqType));
if(me != this)
return me;
const Properties props(properties());
if(props.testFlag(RewriteToEmptyOnEmpty) &&
*CommonSequenceTypes::Empty == *m_operands.first()->staticType()->itemType())
{
return EmptySequence::create(this, context);
}
if(props.testFlag(LastOperandIsCollation) &&
m_operands.count() == maxArgs)
{
m_operands.last() = Expression::Ptr(new CollationChecker(m_operands.last()));
context->wrapExpressionWith(this, m_operands.last());
}
return me;
}
void FunctionCall::setSignature(const FunctionSignature::Ptr &sign)
{
m_signature = sign;
}
FunctionSignature::Ptr FunctionCall::signature() const
{
Q_ASSERT(m_signature); /* It really should be set. */
return m_signature;
}
SequenceType::Ptr FunctionCall::staticType() const
{
Q_ASSERT(m_signature);
if(has(EmptynessFollowsChild))
{
if(m_operands.isEmpty())
{
/* This is a function which uses the context item when having no arguments. */
return signature()->returnType();
}
const Cardinality card(m_operands.first()->staticType()->cardinality());
if(card.allowsEmpty())
return signature()->returnType();
else
{
/* Remove empty. */
return makeGenericSequenceType(signature()->returnType()->itemType(),
card & Cardinality::oneOrMore());
}
}
return signature()->returnType();
}
Expression::Properties FunctionCall::properties() const
{
Q_ASSERT(m_signature);
return signature()->properties();
}
ExpressionVisitorResult::Ptr FunctionCall::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
Expression::ID FunctionCall::id() const
{
Q_ASSERT(m_signature);
return m_signature->id();
}
QT_END_NAMESPACE
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