source: trunk/src/xmlpatterns/expr/qcomputednamespaceconstructor.cpp@ 365

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** This file is part of the QtXmlPatterns module of the Qt Toolkit.
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#include "qanyuri_p.h"
#include "qbuiltintypes_p.h"
#include "qcommonsequencetypes_p.h"
#include "qpatternistlocale_p.h"
#include "private/qxmlutils_p.h"

#include "qcomputednamespaceconstructor_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

ComputedNamespaceConstructor::ComputedNamespaceConstructor(const Expression::Ptr &prefix,
                                                           const Expression::Ptr &namespaceURI) : PairContainer(prefix, namespaceURI)
{
}

void ComputedNamespaceConstructor::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
    const Item prefixItem(m_operand1->evaluateSingleton(context));
    const QString prefix(prefixItem ? prefixItem.stringValue() : QString());

    const Item namespaceItem(m_operand2->evaluateSingleton(context));
    const QString namespaceURI(namespaceItem ? namespaceItem.stringValue() : QString());

    if(namespaceURI.isEmpty())
    {
        context->error(QtXmlPatterns::tr("In a namespace constructor, the value for a namespace cannot be an empty string."),
                       ReportContext::XTDE0930,
                       this);
    }

    /* One optimization could be to store a pointer to
     * the name pool as a member in order to avoid the virtual call(s). */
    const NamePool::Ptr np(context->namePool());

    if(!prefix.isEmpty() && !QXmlUtils::isNCName(prefix))
    {
        context->error(QtXmlPatterns::tr("The prefix must be a valid %1, which %2 is not.")
                                        .arg(formatType(np, BuiltinTypes::xsNCName),
                                             formatKeyword(prefix)),
                       ReportContext::XTDE0920,
                       this);
    }
    const QXmlName binding(np->allocateBinding(prefix, namespaceURI));

    AnyURI::toQUrl<ReportContext::XTDE0905, DynamicContext::Ptr>(namespaceURI,
                                                                 context,
                                                                 this);

    if(binding.prefix() == StandardPrefixes::xmlns)
    {
        context->error(QtXmlPatterns::tr("The prefix %1 cannot be bound.")
                                        .arg(formatKeyword(prefix)),
                       ReportContext::XTDE0920,
                       this);
    }

    if((binding.prefix() == StandardPrefixes::xml && binding.namespaceURI() != StandardNamespaces::xml)
       ||
       (binding.prefix() != StandardPrefixes::xml && binding.namespaceURI() == StandardNamespaces::xml))
    {
        context->error(QtXmlPatterns::tr("Only the prefix %1 can be bound to %2 and vice versa.")
                                        .arg(formatKeyword(prefix), formatKeyword(namespaceURI)),
                       ReportContext::XTDE0925,
                       this);
    }

     context->outputReceiver()->namespaceBinding(binding);
}

SequenceType::Ptr ComputedNamespaceConstructor::staticType() const
{
    return CommonSequenceTypes::ExactlyOneAttribute;
}

SequenceType::List ComputedNamespaceConstructor::expectedOperandTypes() const
{
    SequenceType::List result;
    result.append(CommonSequenceTypes::ZeroOrOneString);
    result.append(CommonSequenceTypes::ZeroOrOneString);
    return result;
}

Expression::Properties ComputedNamespaceConstructor::properties() const
{
    return DisableElimination | IsNodeConstructor;
}

ExpressionVisitorResult::Ptr ComputedNamespaceConstructor::accept(const ExpressionVisitor::Ptr &visitor) const
{
    return visitor->visit(this);
}

QT_END_NAMESPACE