/****************************************************************************+
−
**+
−
** 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.+
−
**+
−
**+
−
**+
−
**+
−
**+
−
**+
−
**+
−
**+
−
** $QT_END_LICENSE$+
−
**+
−
****************************************************************************/+
−
+
−
#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+
−