Windows-4.7.4/src/xmlpatterns/expr/qarithmeticexpression.cpp - platform/external/qt - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2011 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.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** GNU Lesser General Public License Usage
 ** 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.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU General
 ** Public License version 3.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of this
 ** file. Please review the following information to ensure the GNU General
 ** Public License version 3.0 requirements will be met:
 ** http://www.gnu.org/copyleft/gpl.html.
 **
 ** Other Usage
 ** Alternatively, this file may be used in accordance with the terms and
 ** conditions contained in a signed written agreement between you and Nokia.
 **
 **
 **
 **
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "qboolean_p.h"
 #include "qbuiltintypes_p.h"
 #include "qcommonsequencetypes_p.h"
 #include "qemptysequence_p.h"
 #include "qgenericsequencetype_p.h"
 #include "qliteral_p.h"
 #include "qpatternistlocale_p.h"
 #include "qschemanumeric_p.h"
 #include "quntypedatomicconverter_p.h"

 #include "qarithmeticexpression_p.h"

 QT_BEGIN_NAMESPACE

 using namespace QPatternist;

 ArithmeticExpression::ArithmeticExpression(const Expression::Ptr &op1,
                                            const AtomicMathematician::Operator op,
                                            const Expression::Ptr &op2) : PairContainer(op1, op2)
                                                                        , m_op(op)
                                                                        , m_isCompat(false)
 {
 }

 Item ArithmeticExpression::evaluateSingleton(const DynamicContext::Ptr &context) const
 {
     const Item op1(m_operand1->evaluateSingleton(context));
     if(!op1)
         return Item();

     const Item op2(m_operand2->evaluateSingleton(context));
     if(!op2)
         return Item();

     return flexiblyCalculate(op1, m_op, op2, m_mather, context, this,
                              ReportContext::XPTY0004, m_isCompat);
 }

 /**
  * Since ArithmeticExpression::flexiblyCalculate() creates Expression instances
  * at runtime, we have the problem of having SourceLocationReflections for them
  * in the case that we run into a runtime error, since the locations are always
  * located at compile time.
  *
  * This class simply delegates the reflection over to an existing expression.
  *
  * I only managed to trigger this with "current() + 1", where current()
  * evaluates to an invalid representation for @c xs:double.
  *
  * @since 4.5
  * @author Frans Englich <frans.englich@nokia.com>
  */
 class DelegatingReflectionExpression : public Literal
 {
 public:
     DelegatingReflectionExpression(const Item &item,
                                    const SourceLocationReflection *const reflection) : Literal(item)
                                                                                      , m_reflection(reflection)
     {
     }

     virtual const SourceLocationReflection *actualReflection() const
     {
         return m_reflection;
     }

 private:
     const SourceLocationReflection *const m_reflection;
 };

 Item ArithmeticExpression::flexiblyCalculate(const Item &op1,
                                              const AtomicMathematician::Operator op,
                                              const Item &op2,
                                              const AtomicMathematician::Ptr &mather,
                                              const DynamicContext::Ptr &context,
                                              const SourceLocationReflection *const reflection,
                                              const ReportContext::ErrorCode code,
                                              const bool isCompat)
 {
     if(mather)
         return mather->calculate(op1, op, op2, context);

     /* This is a very heavy code path. */
     Expression::Ptr a1(new DelegatingReflectionExpression(op1, reflection));
     Expression::Ptr a2(new DelegatingReflectionExpression(op2, reflection));

     const AtomicMathematician::Ptr ingela(fetchMathematician(a1, a2, op, true, context, reflection, code, isCompat));

     return ingela->calculate(a1->evaluateSingleton(context),
                              op,
                              a2->evaluateSingleton(context),
                              context);
 }

 Expression::Ptr ArithmeticExpression::typeCheck(const StaticContext::Ptr &context,
                                                 const SequenceType::Ptr &reqType)
 {
     m_isCompat = context->compatModeEnabled();

     const Expression::Ptr me(PairContainer::typeCheck(context, reqType));
     const ItemType::Ptr t1(m_operand1->staticType()->itemType());
     const ItemType::Ptr t2(m_operand2->staticType()->itemType());

     if(*CommonSequenceTypes::Empty == *t1 ||
        *CommonSequenceTypes::Empty == *t2)
     {
         return EmptySequence::create(this, context);
     }

     if(*BuiltinTypes::xsAnyAtomicType == *t1    ||
        *BuiltinTypes::xsAnyAtomicType == *t2    ||
        *BuiltinTypes::numeric == *t1            ||
        *BuiltinTypes::numeric == *t2)
     {
         /* The static type of (at least) one of the operands could not
          * be narrowed further than xs:anyAtomicType, so we do the operator
          * lookup at runtime. */
         return me;
     }

     m_mather = fetchMathematician(m_operand1, m_operand2, m_op, true, context, this,
                                   ReportContext::XPTY0004, m_isCompat);

     return me;
 }

 AtomicMathematician::Ptr
 ArithmeticExpression::fetchMathematician(Expression::Ptr &op1,
                                          Expression::Ptr &op2,
                                          const AtomicMathematician::Operator op,
                                          const bool issueError,
                                          const ReportContext::Ptr &context,
                                          const SourceLocationReflection *const reflection,
                                          const ReportContext::ErrorCode code,
                                          const bool isCompat)
 {
     ItemType::Ptr t1(op1->staticType()->itemType());
     ItemType::Ptr t2(op2->staticType()->itemType());

     if(BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t1)
        || (isCompat && (BuiltinTypes::xsString->xdtTypeMatches(t1)
                         || BuiltinTypes::xsDecimal->xdtTypeMatches(t1))))
     {
         op1 = Expression::Ptr(new UntypedAtomicConverter(op1, BuiltinTypes::xsDouble));
         /* The types might have changed, reload. */
         t1 = op1->staticType()->itemType();
     }

     if(BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t2)
        || (isCompat && (BuiltinTypes::xsString->xdtTypeMatches(t1)
                         || BuiltinTypes::xsDecimal->xdtTypeMatches(t1))))
     {
         op2 = Expression::Ptr(new UntypedAtomicConverter(op2, BuiltinTypes::xsDouble));
         /* The types might have changed, reload. */
         t2 = op2->staticType()->itemType();
     }

     const AtomicMathematicianLocator::Ptr locator
         (static_cast<const AtomicType *>(t1.data())->mathematicianLocator());

     if(!locator)
     {
         if(!issueError)
             return AtomicMathematician::Ptr();

         context->error(QtXmlPatterns::tr(
                        "Operator %1 cannot be used on type %2.")
                        .arg(formatKeyword(AtomicMathematician::displayName(op)))
                        .arg(formatType(context->namePool(), t1)),
                        code, reflection);
         return AtomicMathematician::Ptr();
     }

     const AtomicMathematician::Ptr comp
         (static_cast<const AtomicType *>(t2.data())->accept(locator, op, reflection));

     if(comp)
         return comp;

     if(!issueError)
         return AtomicMathematician::Ptr();

     context->error(QtXmlPatterns::tr("Operator %1 cannot be used on "
                                      "atomic values of type %2 and %3.")
                    .arg(formatKeyword(AtomicMathematician::displayName(op)))
                    .arg(formatType(context->namePool(), t1))
                    .arg(formatType(context->namePool(), t2)),
                    code, reflection);
     return AtomicMathematician::Ptr();
 }

 SequenceType::Ptr ArithmeticExpression::staticType() const
 {
     Cardinality card;

     /* These variables are important because they ensure staticType() only
      * gets called once from this function. Before, this lead to strange
      * semi-infinite recursion involving many arithmetic expressions. */
     const SequenceType::Ptr st1(m_operand1->staticType());
     const SequenceType::Ptr st2(m_operand2->staticType());

     if(st1->cardinality().allowsEmpty() ||
        st2->cardinality().allowsEmpty())
     {
         card = Cardinality::zeroOrOne();
     }
     else
         card = Cardinality::exactlyOne();

     if(m_op == AtomicMathematician::IDiv)
         return makeGenericSequenceType(BuiltinTypes::xsInteger, card);

     const ItemType::Ptr t1(st1->itemType());
     const ItemType::Ptr t2(st2->itemType());
     ItemType::Ptr returnType;

     /* Please, make this beautiful? */
     if(BuiltinTypes::xsTime->xdtTypeMatches(t1) ||
        BuiltinTypes::xsDate->xdtTypeMatches(t1) ||
        BuiltinTypes::xsDateTime->xdtTypeMatches(t1))
     {
         if(BuiltinTypes::xsDuration->xdtTypeMatches(t2))
             returnType = t1;
         else
             returnType = BuiltinTypes::xsDayTimeDuration;
     }
     else if(BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t1))
     {
         if(m_op == AtomicMathematician::Div &&
            BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t2))
         {
             returnType = BuiltinTypes::xsDecimal;
         }
         else if(BuiltinTypes::numeric->xdtTypeMatches(t2))
             returnType = BuiltinTypes::xsYearMonthDuration;
         else
             returnType = t2;
     }
     else if(BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t2))
     {
         returnType = BuiltinTypes::xsYearMonthDuration;
     }
     else if(BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t1))
     {
         if(m_op == AtomicMathematician::Div &&
            BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t2))
         {
             returnType = BuiltinTypes::xsDecimal;
         }
         else if(BuiltinTypes::numeric->xdtTypeMatches(t2))
             returnType = BuiltinTypes::xsDayTimeDuration;
         else
             returnType = t2;
     }
     else if(BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t2))
     {
         returnType = BuiltinTypes::xsDayTimeDuration;
     }
     else if(BuiltinTypes::xsDouble->xdtTypeMatches(t1) ||
             BuiltinTypes::xsDouble->xdtTypeMatches(t2))
     {
         returnType = BuiltinTypes::xsDouble;
     }
     else if(BuiltinTypes::xsFloat->xdtTypeMatches(t1) ||
             BuiltinTypes::xsFloat->xdtTypeMatches(t2))
     {
         if(m_isCompat)
             returnType = BuiltinTypes::xsFloat;
         else
             returnType = BuiltinTypes::xsDouble;
     }
     else if(BuiltinTypes::xsInteger->xdtTypeMatches(t1) &&
             BuiltinTypes::xsInteger->xdtTypeMatches(t2))
     {
         if(m_isCompat)
             returnType = BuiltinTypes::xsDouble;
         else
         {
             /* "A div B  numeric  numeric  op:numeric-divide(A, B)
              * numeric; but xs:decimal if both operands are xs:integer" */
             if(m_op == AtomicMathematician::Div)
                 returnType = BuiltinTypes::xsDecimal;
             else
                 returnType = BuiltinTypes::xsInteger;
         }
     }
     else if(m_isCompat && (BuiltinTypes::xsInteger->xdtTypeMatches(t1) &&
                            BuiltinTypes::xsInteger->xdtTypeMatches(t2)))
     {
         returnType = BuiltinTypes::xsDouble;
     }
     else
     {
         /* If typeCheck() has been called, our operands conform to expectedOperandTypes(), and
          * the types are hence either xs:decimals, or xs:anyAtomicType(meaning the static type could
          * not be inferred), or empty-sequence(). So we use the union of the two types. The combinations
          * could also be wrong.*/
         returnType = t1 | t2;

         /* However, if we're called before typeCheck(), we could potentially have nodes, so we need to make
          * sure that the type is at least atomic. */
         if(!BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(returnType))
             returnType = BuiltinTypes::xsAnyAtomicType;
     }

     return makeGenericSequenceType(returnType, card);
 }

 SequenceType::List ArithmeticExpression::expectedOperandTypes() const
 {
     SequenceType::List result;
     result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
     result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
     return result;
 }

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

 QT_END_NAMESPACE
	/****************************************************************************
	**
	** Copyright (C) 2011 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.
	**
	** $QT_BEGIN_LICENSE:LGPL$
	** GNU Lesser General Public License Usage
	** 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.
	**
	** GNU General Public License Usage
	** Alternatively, this file may be used under the terms of the GNU General
	** Public License version 3.0 as published by the Free Software Foundation
	** and appearing in the file LICENSE.GPL included in the packaging of this
	** file. Please review the following information to ensure the GNU General
	** Public License version 3.0 requirements will be met:
	** http://www.gnu.org/copyleft/gpl.html.
	**
	** Other Usage
	** Alternatively, this file may be used in accordance with the terms and
	** conditions contained in a signed written agreement between you and Nokia.
	**
	**
	**
	**
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	#include "qboolean_p.h"
	#include "qbuiltintypes_p.h"
	#include "qcommonsequencetypes_p.h"
	#include "qemptysequence_p.h"
	#include "qgenericsequencetype_p.h"
	#include "qliteral_p.h"
	#include "qpatternistlocale_p.h"
	#include "qschemanumeric_p.h"
	#include "quntypedatomicconverter_p.h"

	#include "qarithmeticexpression_p.h"

	QT_BEGIN_NAMESPACE

	using namespace QPatternist;

	ArithmeticExpression::ArithmeticExpression(const Expression::Ptr &op1,
	const AtomicMathematician::Operator op,
	const Expression::Ptr &op2) : PairContainer(op1, op2)
	, m_op(op)
	, m_isCompat(false)
	{
	}

	Item ArithmeticExpression::evaluateSingleton(const DynamicContext::Ptr &context) const
	{
	const Item op1(m_operand1->evaluateSingleton(context));
	if(!op1)
	return Item();

	const Item op2(m_operand2->evaluateSingleton(context));
	if(!op2)
	return Item();

	return flexiblyCalculate(op1, m_op, op2, m_mather, context, this,
	ReportContext::XPTY0004, m_isCompat);
	}

	/**
	* Since ArithmeticExpression::flexiblyCalculate() creates Expression instances
	* at runtime, we have the problem of having SourceLocationReflections for them
	* in the case that we run into a runtime error, since the locations are always
	* located at compile time.
	*
	* This class simply delegates the reflection over to an existing expression.
	*
	* I only managed to trigger this with "current() + 1", where current()
	* evaluates to an invalid representation for @c xs:double.
	*
	* @since 4.5
	* @author Frans Englich <frans.englich@nokia.com>
	*/
	class DelegatingReflectionExpression : public Literal
	{
	public:
	DelegatingReflectionExpression(const Item &item,
	const SourceLocationReflection *const reflection) : Literal(item)
	, m_reflection(reflection)
	{
	}

	virtual const SourceLocationReflection *actualReflection() const
	{
	return m_reflection;
	}

	private:
	const SourceLocationReflection *const m_reflection;
	};

	Item ArithmeticExpression::flexiblyCalculate(const Item &op1,
	const AtomicMathematician::Operator op,
	const Item &op2,
	const AtomicMathematician::Ptr &mather,
	const DynamicContext::Ptr &context,
	const SourceLocationReflection *const reflection,
	const ReportContext::ErrorCode code,
	const bool isCompat)
	{
	if(mather)
	return mather->calculate(op1, op, op2, context);

	/* This is a very heavy code path. */
	Expression::Ptr a1(new DelegatingReflectionExpression(op1, reflection));
	Expression::Ptr a2(new DelegatingReflectionExpression(op2, reflection));

	const AtomicMathematician::Ptr ingela(fetchMathematician(a1, a2, op, true, context, reflection, code, isCompat));

	return ingela->calculate(a1->evaluateSingleton(context),
	op,
	a2->evaluateSingleton(context),
	context);
	}

	Expression::Ptr ArithmeticExpression::typeCheck(const StaticContext::Ptr &context,
	const SequenceType::Ptr &reqType)
	{
	m_isCompat = context->compatModeEnabled();

	const Expression::Ptr me(PairContainer::typeCheck(context, reqType));
	const ItemType::Ptr t1(m_operand1->staticType()->itemType());
	const ItemType::Ptr t2(m_operand2->staticType()->itemType());

	if(CommonSequenceTypes::Empty == t1 \|\|
	CommonSequenceTypes::Empty == t2)
	{
	return EmptySequence::create(this, context);
	}

	if(BuiltinTypes::xsAnyAtomicType == t1 \|\|
	BuiltinTypes::xsAnyAtomicType == t2 \|\|
	BuiltinTypes::numeric == t1 \|\|
	BuiltinTypes::numeric == t2)
	{
	/* The static type of (at least) one of the operands could not
	* be narrowed further than xs:anyAtomicType, so we do the operator
	* lookup at runtime. */
	return me;
	}

	m_mather = fetchMathematician(m_operand1, m_operand2, m_op, true, context, this,
	ReportContext::XPTY0004, m_isCompat);

	return me;
	}

	AtomicMathematician::Ptr
	ArithmeticExpression::fetchMathematician(Expression::Ptr &op1,
	Expression::Ptr &op2,
	const AtomicMathematician::Operator op,
	const bool issueError,
	const ReportContext::Ptr &context,
	const SourceLocationReflection *const reflection,
	const ReportContext::ErrorCode code,
	const bool isCompat)
	{
	ItemType::Ptr t1(op1->staticType()->itemType());
	ItemType::Ptr t2(op2->staticType()->itemType());

	if(BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t1)
	\|\| (isCompat && (BuiltinTypes::xsString->xdtTypeMatches(t1)
	\|\| BuiltinTypes::xsDecimal->xdtTypeMatches(t1))))
	{
	op1 = Expression::Ptr(new UntypedAtomicConverter(op1, BuiltinTypes::xsDouble));
	/* The types might have changed, reload. */
	t1 = op1->staticType()->itemType();
	}

	if(BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t2)
	\|\| (isCompat && (BuiltinTypes::xsString->xdtTypeMatches(t1)
	\|\| BuiltinTypes::xsDecimal->xdtTypeMatches(t1))))
	{
	op2 = Expression::Ptr(new UntypedAtomicConverter(op2, BuiltinTypes::xsDouble));
	/* The types might have changed, reload. */
	t2 = op2->staticType()->itemType();
	}

	const AtomicMathematicianLocator::Ptr locator
	(static_cast<const AtomicType *>(t1.data())->mathematicianLocator());

	if(!locator)
	{
	if(!issueError)
	return AtomicMathematician::Ptr();

	context->error(QtXmlPatterns::tr(
	"Operator %1 cannot be used on type %2.")
	.arg(formatKeyword(AtomicMathematician::displayName(op)))
	.arg(formatType(context->namePool(), t1)),
	code, reflection);
	return AtomicMathematician::Ptr();
	}

	const AtomicMathematician::Ptr comp
	(static_cast<const AtomicType *>(t2.data())->accept(locator, op, reflection));

	if(comp)
	return comp;

	if(!issueError)
	return AtomicMathematician::Ptr();

	context->error(QtXmlPatterns::tr("Operator %1 cannot be used on "
	"atomic values of type %2 and %3.")
	.arg(formatKeyword(AtomicMathematician::displayName(op)))
	.arg(formatType(context->namePool(), t1))
	.arg(formatType(context->namePool(), t2)),
	code, reflection);
	return AtomicMathematician::Ptr();
	}

	SequenceType::Ptr ArithmeticExpression::staticType() const
	{
	Cardinality card;

	/* These variables are important because they ensure staticType() only
	* gets called once from this function. Before, this lead to strange
	* semi-infinite recursion involving many arithmetic expressions. */
	const SequenceType::Ptr st1(m_operand1->staticType());
	const SequenceType::Ptr st2(m_operand2->staticType());

	if(st1->cardinality().allowsEmpty() \|\|
	st2->cardinality().allowsEmpty())
	{
	card = Cardinality::zeroOrOne();
	}
	else
	card = Cardinality::exactlyOne();

	if(m_op == AtomicMathematician::IDiv)
	return makeGenericSequenceType(BuiltinTypes::xsInteger, card);

	const ItemType::Ptr t1(st1->itemType());
	const ItemType::Ptr t2(st2->itemType());
	ItemType::Ptr returnType;

	/* Please, make this beautiful? */
	if(BuiltinTypes::xsTime->xdtTypeMatches(t1) \|\|
	BuiltinTypes::xsDate->xdtTypeMatches(t1) \|\|
	BuiltinTypes::xsDateTime->xdtTypeMatches(t1))
	{
	if(BuiltinTypes::xsDuration->xdtTypeMatches(t2))
	returnType = t1;
	else
	returnType = BuiltinTypes::xsDayTimeDuration;
	}
	else if(BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t1))
	{
	if(m_op == AtomicMathematician::Div &&
	BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t2))
	{
	returnType = BuiltinTypes::xsDecimal;
	}
	else if(BuiltinTypes::numeric->xdtTypeMatches(t2))
	returnType = BuiltinTypes::xsYearMonthDuration;
	else
	returnType = t2;
	}
	else if(BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t2))
	{
	returnType = BuiltinTypes::xsYearMonthDuration;
	}
	else if(BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t1))
	{
	if(m_op == AtomicMathematician::Div &&
	BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t2))
	{
	returnType = BuiltinTypes::xsDecimal;
	}
	else if(BuiltinTypes::numeric->xdtTypeMatches(t2))
	returnType = BuiltinTypes::xsDayTimeDuration;
	else
	returnType = t2;
	}
	else if(BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t2))
	{
	returnType = BuiltinTypes::xsDayTimeDuration;
	}
	else if(BuiltinTypes::xsDouble->xdtTypeMatches(t1) \|\|
	BuiltinTypes::xsDouble->xdtTypeMatches(t2))
	{
	returnType = BuiltinTypes::xsDouble;
	}
	else if(BuiltinTypes::xsFloat->xdtTypeMatches(t1) \|\|
	BuiltinTypes::xsFloat->xdtTypeMatches(t2))
	{
	if(m_isCompat)
	returnType = BuiltinTypes::xsFloat;
	else
	returnType = BuiltinTypes::xsDouble;
	}
	else if(BuiltinTypes::xsInteger->xdtTypeMatches(t1) &&
	BuiltinTypes::xsInteger->xdtTypeMatches(t2))
	{
	if(m_isCompat)
	returnType = BuiltinTypes::xsDouble;
	else
	{
	/* "A div B numeric numeric op:numeric-divide(A, B)
	* numeric; but xs:decimal if both operands are xs:integer" */
	if(m_op == AtomicMathematician::Div)
	returnType = BuiltinTypes::xsDecimal;
	else
	returnType = BuiltinTypes::xsInteger;
	}
	}
	else if(m_isCompat && (BuiltinTypes::xsInteger->xdtTypeMatches(t1) &&
	BuiltinTypes::xsInteger->xdtTypeMatches(t2)))
	{
	returnType = BuiltinTypes::xsDouble;
	}
	else
	{
	/* If typeCheck() has been called, our operands conform to expectedOperandTypes(), and
	* the types are hence either xs:decimals, or xs:anyAtomicType(meaning the static type could
	* not be inferred), or empty-sequence(). So we use the union of the two types. The combinations
	* could also be wrong.*/
	returnType = t1 \| t2;

	/* However, if we're called before typeCheck(), we could potentially have nodes, so we need to make
	* sure that the type is at least atomic. */
	if(!BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(returnType))
	returnType = BuiltinTypes::xsAnyAtomicType;
	}

	return makeGenericSequenceType(returnType, card);
	}

	SequenceType::List ArithmeticExpression::expectedOperandTypes() const
	{
	SequenceType::List result;
	result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
	result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
	return result;
	}

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

	QT_END_NAMESPACE