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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qitem_p.h"
#include "qbuiltintypes_p.h"
#include "qcardinalityverifier_p.h"
#include "qcommonsequencetypes_p.h"
#include "qemptysequence_p.h"
#include "qgenericsequencetype_p.h"
#include "qliteral_p.h"
#include "qpatternistlocale_p.h"
#include "qnamespaceresolver_p.h"
#include "qqnameconstructor_p.h"
#include "qqnamevalue_p.h"
#include "qatomicstring_p.h"
#include "qvalidationerror_p.h"
#include "qcastas_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
CastAs::CastAs(const Expression::Ptr &source,
const SequenceType::Ptr &tType) : SingleContainer(source),
m_targetType(tType)
{
Q_ASSERT(source);
Q_ASSERT(tType);
Q_ASSERT(!tType->cardinality().allowsMany());
Q_ASSERT(tType->itemType()->isAtomicType());
}
Item CastAs::evaluateSingleton(const DynamicContext::Ptr &context) const
{
Q_ASSERT(context);
const Item val(m_operand->evaluateSingleton(context));
if(val)
return cast(val, context);
else
{
/* No item supplied, let's handle the cardinality part. */
if(m_targetType->cardinality().allowsEmpty())
return Item();
else
{
Q_ASSERT(context);
context->error(QtXmlPatterns::tr("Type error in cast, expected %1, "
"received %2.")
.arg(formatType(Cardinality::exactlyOne()))
.arg(formatType(Cardinality::empty())),
ReportContext::XPTY0004, this);
return Item();
}
}
}
Expression::Ptr CastAs::typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType)
{
checkTargetType(context);
const SequenceType::Ptr seqt(m_operand->staticType());
ItemType::Ptr t(seqt->itemType());
/* Special case xs:QName */
if(BuiltinTypes::xsQName->xdtTypeMatches(m_targetType->itemType()))
{
/* Ok, We're casting to xs:QName. */
if(m_operand->is(IDStringValue)) /* A valid combination, let's do the cast. */
return castToQName(context)->typeCheck(context, reqType);
else if(BuiltinTypes::xsQName->xdtTypeMatches(t))
return m_operand->typeCheck(context, reqType);
else if(seqt->cardinality().isEmpty() && m_targetType->cardinality().allowsEmpty())
return EmptySequence::create(this, context);
else if(!(seqt->cardinality().isEmpty() && !m_targetType->cardinality().allowsEmpty()))
{
context->error(QtXmlPatterns::tr("When casting to %1 or types "
"derived from it, the source "
"value must be of the same type, "
"or it must be a string literal. "
"Type %2 is not allowed.")
.arg(formatType(context->namePool(), BuiltinTypes::xsQName))
.arg(formatType(context->namePool(), seqt)),
ReportContext::XPTY0004, this);
return Expression::Ptr(this);
}
}
const Expression::Ptr me(SingleContainer::typeCheck(context, reqType));
/* Type may have changed, such as that atomization has been applied. */
t = m_operand->staticType()->itemType();
if(m_targetType->itemType()->xdtTypeMatches(t) &&
!BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t) &&
!BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t))
{ /* At least casting is superflorous. */
if(m_operand->staticType()->cardinality().isMatch(m_targetType->cardinality()))
return m_operand; /* The whole cast expression is redundant. */
else
{ /* Only cardinality check is needed, rewrite to CardinalityVerifier. */
return Expression::Ptr(new CardinalityVerifier(m_operand,
m_targetType->cardinality(),
ReportContext::FORG0001));
}
}
/* Let the CastingPlatform look up its AtomicCaster. */
prepareCasting(context, t);
return me;
}
Expression::Ptr CastAs::compress(const StaticContext::Ptr &context)
{
/* Simplify casts to itself. */
if(*m_targetType->itemType() == *m_operand->staticType()->itemType())
return m_operand->compress(context);
else
return SingleContainer::compress(context);
}
Expression::Ptr CastAs::castToQName(const StaticContext::Ptr &context) const
{
/* Apply the whitespace facet by calling trimmed(). */
/* We can assume m_operand is an Expression because this is a requirement
* for casting to xs:QName. */
const QString lexQName(m_operand->as<Literal>()->item().as<AtomicValue>()->stringValue().trimmed());
const QXmlName
expName(QNameConstructor::expandQName<StaticContext::Ptr,
ReportContext::FORG0001,
ReportContext::FONS0004>(lexQName,
context,
context->namespaceBindings(), this));
return wrapLiteral(toItem(QNameValue::fromValue(context->namePool(), expName)), context, this);
}
SequenceType::Ptr CastAs::staticType() const
{
if(m_operand->staticType()->cardinality().allowsEmpty())
return m_targetType;
else
return makeGenericSequenceType(m_targetType->itemType(),
Cardinality::exactlyOne());
}
SequenceType::List CastAs::expectedOperandTypes() const
{
SequenceType::List result;
if(m_targetType->cardinality().allowsEmpty())
result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
else
result.append(CommonSequenceTypes::ExactlyOneAtomicType);
return result;
}
ExpressionVisitorResult::Ptr CastAs::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
QT_END_NAMESPACE
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