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** This file is part of the QtXmlPatterns module of the Qt Toolkit.

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****************************************************************************/

#include "qcommonsequencetypes_p.h"

#include "qpatternistlocale_p.h"

#include "qnodebuilder_p.h"

#include "qqnamevalue_p.h"

#include "qprocessinginstructionconstructor_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

ProcessingInstructionConstructor::

ProcessingInstructionConstructor(const Expression::Ptr &op1,

                                 const Expression::Ptr &op2) : PairContainer(op1, op2)

{

}

QString ProcessingInstructionConstructor::leftTrimmed(const QString &input)

{

    const int len = input.length();

    for(int i = 0; i < len; ++i)

    {

        if(!input.at(i).isSpace())

            return input.mid(i);

    }

    return QString(); /* input consists only of whitespace. All was trimmed. */

}

QString ProcessingInstructionConstructor::data(const DynamicContext::Ptr &context) const

{

    const Item name(m_operand1->evaluateSingleton(context));

    const Item dataArg(m_operand2->evaluateSingleton(context));

    if(dataArg)

    {

        /* Perform trimming before validation, to increase speed. */

        const QString value(leftTrimmed(dataArg.stringValue()));

        if(value.contains(QLatin1String("?>")))

        {

            context->error(QtXmlPatterns::tr("The data of a processing instruction cannot contain the string %1").arg(formatData("?>")),

                              ReportContext::XQDY0026, this);

            return QString();

        }

        else

            return value;

    }

    else

        return QString();

}

QXmlName ProcessingInstructionConstructor::evaluateTardata(const DynamicContext::Ptr &context) const

{

    const Item name(m_operand1->evaluateSingleton(context));

    return context->namePool()->allocateQName(QString(), name.stringValue());

}

Item ProcessingInstructionConstructor::evaluateSingleton(const DynamicContext::Ptr &context) const

{

    const NodeBuilder::Ptr nodeBuilder(context->nodeBuilder(QUrl()));

    nodeBuilder->processingInstruction(evaluateTardata(context), data(context));

    const QAbstractXmlNodeModel::Ptr nm(nodeBuilder->builtDocument());

    context->addNodeModel(nm);

    return nm->root(QXmlNodeModelIndex());

}

void ProcessingInstructionConstructor::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const

{

    QAbstractXmlReceiver *const receiver = context->outputReceiver();

    receiver->processingInstruction(evaluateTardata(context), data(context));

}

SequenceType::Ptr ProcessingInstructionConstructor::staticType() const

{

    return CommonSequenceTypes::ExactlyOneProcessingInstruction;

}

SequenceType::List ProcessingInstructionConstructor::expectedOperandTypes() const

{

    SequenceType::List result;

    result.append(CommonSequenceTypes::ExactlyOneString);

    result.append(CommonSequenceTypes::ZeroOrOneString);

    return result;

}

Expression::Properties ProcessingInstructionConstructor::properties() const

{

    return DisableElimination | IsNodeConstructor;

}

ExpressionVisitorResult::Ptr

ProcessingInstructionConstructor::accept(const ExpressionVisitor::Ptr &visitor) const

{

    return visitor->visit(this);

}

QT_END_NAMESPACE