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

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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** Foundation and appearing in the file LICENSE.LGPL included in the

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

#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