QPatternist::Numeric Class Reference

Base class for all numeric values. More...

#include <qschemanumeric_p.h>

Inheritance diagram for QPatternist::Numeric:

Public Types
typedef QExplicitlySharedDataPointer< Numeric >	Ptr
Public Types inherited from QPatternist::AtomicValue
typedef QList< AtomicValue::Ptr >	List
typedef QExplicitlySharedDataPointer< AtomicValue >	Ptr

Public Functions
virtual Numeric::Ptr	abs () const =0
virtual Numeric::Ptr	ceiling () const =0
virtual Numeric::Ptr	floor () const =0
virtual bool	isInf () const =0
virtual bool	isNaN () const =0
virtual bool	isSigned () const =0
	Returns true if this value is signed. If false is returned, the value is unsigned. More...
virtual Numeric::Ptr	round () const =0
virtual Numeric::Ptr	roundHalfToEven (const xsInteger scale) const =0
virtual xsFloat	toDecimal () const =0
virtual xsDouble	toDouble () const =0
virtual xsFloat	toFloat () const =0
virtual xsInteger	toInteger () const =0
virtual Item	toNegated () const =0
virtual qulonglong	toUnsignedInteger () const =0
Public Functions inherited from QPatternist::AtomicValue
virtual bool	evaluateEBV (const QExplicitlySharedDataPointer< DynamicContext > &context) const
virtual bool	hasError () const
virtual QString	stringValue () const =0
virtual ItemType::Ptr	type () const =0
virtual	~AtomicValue ()
Public Functions inherited from QSharedData
	QSharedData ()
	Constructs a QSharedData object with a reference count of 0. More...
	QSharedData (const QSharedData &)
	Constructs a QSharedData object with reference count 0. More...
Public Functions inherited from QPatternist::CppCastingHelper< AtomicValue >
const TCastTarget *	as () const
TCastTarget *	as ()

Static Public Functions
static AtomicValue::Ptr	fromLexical (const QString &number)
Static Public Functions inherited from QPatternist::AtomicValue
static ItemType::Ptr	qtToXDMType (const QXmlItem &item)
static QVariant	toQt (const AtomicValue *const value)
static QVariant	toQt (const AtomicValue::Ptr &value)
static Item	toXDM (const QVariant &value)

Static Protected Functions
static xsDouble	roundFloat (const xsDouble val)
	Implements fn:round() for types implemented with floating point. More...

Additional Inherited Members
Public Variables inherited from QSharedData
QAtomicInt	ref
Protected Functions inherited from QPatternist::AtomicValue
	AtomicValue ()
Protected Functions inherited from QPatternist::CppCastingHelper< AtomicValue >
	CppCastingHelper ()

Detailed Description

Base class for all numeric values.

Creating Instances

See also

XQuery 1.0 and XPath 2.0 Functions and Operators, 6 Functions and Operators on Numerics

XQuery 1.0 and XPath 2.0 Functions and Operators, 1.2 Function Overloading

Author

Frans Englich frans.nosp@m..eng.nosp@m.lich@.nosp@m.noki.nosp@m.a.com

Definition at line 90 of file qschemanumeric_p.h.

Typedefs

Ptr

typedef QExplicitlySharedDataPointer<Numeric> QPatternist::Numeric::Ptr

Definition at line 94 of file qschemanumeric_p.h.

Functions

abs()

virtual Numeric::Ptr QPatternist::Numeric::abs ( ) const

pure virtual

Performs the algorithm specified for the function fn:abs on this Numeric, and whose result is returned.

See also

XQuery 1.0 and XPath 2.0 Functions and Operators, 6.4.1 fn:abs

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::AbstractFloat< isDouble >, QPatternist::Decimal, and QPatternist::Integer.

Referenced by QPatternist::AbsFN::evaluateSingleton().

ceiling()

virtual Numeric::Ptr QPatternist::Numeric::ceiling ( ) const

pure virtual

Performs the algorithm specified for the function fn:ceiling on this Numeric, and whose result is returned.

See also

XQuery 1.0 and XPath 2.0 Functions and Operators, 6.4.2 fn:ceiling

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::AbstractFloat< isDouble >, QPatternist::Decimal, and QPatternist::Integer.

Referenced by QPatternist::CeilingFN::evaluateSingleton().

floor()

virtual Numeric::Ptr QPatternist::Numeric::floor ( ) const

pure virtual

Performs the algorithm specified for the function fn:floor on this Numeric, and whose result is returned.

See also

XQuery 1.0 and XPath 2.0 Functions and Operators, 6.4.3 fn:floor

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::AbstractFloat< isDouble >, QPatternist::Decimal, and QPatternist::Integer.

Referenced by QPatternist::FloorFN::evaluateSingleton().

fromLexical()

AtomicValue::Ptr Numeric::fromLexical ( const QString &  number )

static

Creates a Numeric sub-class that is appropriate for number.

Note

usages of e/E is not handled; Double::fromLexical should be used in that case. There is no function similar to fromLexical that also takes double values into account(because that distinction is done in the scanner).

Currently used in the parser to create appropriate expressions.

Definition at line 62 of file qschemanumeric.cpp.

{
    Q_ASSERT(!number.isEmpty());
    Q_ASSERT_X(!number.contains(QLatin1Char('e')) &&
               !number.contains(QLatin1Char('E')),
               Q_FUNC_INFO, "Should not contain any e/E");

    if(number.contains(QLatin1Char('.'))) /* an xs:decimal. */
        return Decimal::fromLexical(number);
    else /* It's an integer, of some sort. E.g, -3, -2, -1, 0, 1, 2, 3 */
        return Integer::fromLexical(number);
}

isInf()

virtual bool QPatternist::Numeric::isInf ( ) const

pure virtual

Determines whether this Numeric is an infinite number. Signedness is irrelevant, -INF as well as INF is considered infinity.

For numeric types that cannot represent infinity, such as xs:integer , this function should return false.

Returns

true if this Numeric is an infinite number

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::Decimal, QPatternist::AbstractFloat< isDouble >, and QPatternist::Integer.

Referenced by QPatternist::AbstractFloatMathematician< isDouble >::calculate().

isNaN()

virtual bool QPatternist::Numeric::isNaN ( ) const

pure virtual

Determines whether this Numeric is not-a-number, NaN. For numeric types that cannot represent NaN, this function should return false.

Returns

true if this Numeric is NaN

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::AbstractFloat< isDouble >, QPatternist::Decimal, and QPatternist::Integer.

Referenced by QPatternist::AbstractFloatMathematician< isDouble >::calculate(), and qLess< Item::List >::isNaN().

isSigned()

virtual bool QPatternist::Numeric::isSigned ( ) const

pure virtual

Returns true if this value is signed. If false is returned, the value is unsigned.

For float and decimal values, xs:double, xs:float and xs:decimal, the code asserts and behavior is undefined.

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::Decimal, QPatternist::AbstractFloat< isDouble >, and QPatternist::Integer.

Referenced by QPatternist::IntegerComparator::compare().

round()

virtual Numeric::Ptr QPatternist::Numeric::round ( ) const

pure virtual

Performs the algorithm specified for the function fn:round on this Numeric, and whose result is returned.

See also

XQuery 1.0 and XPath 2.0 Functions and Operators, 6.4.4 fn:round

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::AbstractFloat< isDouble >, QPatternist::Decimal, and QPatternist::Integer.

Referenced by QPatternist::RoundFN::evaluateSingleton().

roundFloat()

xsDouble Numeric::roundFloat ( const xsDouble  val )

staticprotected

Implements fn:round() for types implemented with floating point.

MS Windows and at least IRIX does not have C99's nearbyint() function(see the man page), so we reinvent it.

Definition at line 75 of file qschemanumeric.cpp.

Referenced by QPatternist::Decimal::round(), and QPatternist::AbstractFloat< isDouble >::round().

{
    if(qIsInf(val) || AbstractFloat<true>::isEqual(val, 0.0))
        return val;
    else if(qIsNaN(val))
        return val;
    else
    {
        if(val >= -0.5 && val < 0)
            return -0.0;
        else
            return ::floor(val + 0.5);

    }
}

roundHalfToEven()

virtual Numeric::Ptr QPatternist::Numeric::roundHalfToEven ( const xsInteger  scale ) const

pure virtual

Performs rounding as defined for the fn:round-half-to-even on this Numeric, and whose result is returned.

See also

XQuery 1.0 and XPath 2.0 Functions and Operators, 6.4.5 fn:round-half-to-even

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::AbstractFloat< isDouble >, QPatternist::Decimal, and QPatternist::Integer.

Referenced by QPatternist::RoundHalfToEvenFN::evaluateSingleton().

toDecimal()

virtual xsFloat QPatternist::Numeric::toDecimal ( ) const

pure virtual

Returns

the particular number's value as a native representation of the type xs:decimal. This can be considered that the value is cast to xs:decimal.

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::AbstractFloat< isDouble >, QPatternist::Decimal, and QPatternist::Integer.

Referenced by QPatternist::ComparingAggregator< oper, result >::applyNumericPromotion(), QPatternist::DecimalMathematician::calculate(), QPatternist::IntegerMathematician::calculate(), and QPatternist::DecimalComparator::equals().

toDouble()

virtual xsDouble QPatternist::Numeric::toDouble ( ) const

pure virtual

Returns

the particular number's value as a native representation of the type xs:double. This can be considered that the value is cast to xs:double.

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::AbstractFloat< isDouble >, QPatternist::Decimal, and QPatternist::Integer.

Referenced by QPatternist::ComparingAggregator< oper, result >::applyNumericPromotion(), QPatternist::AbstractFloatMathematician< isDouble >::calculate(), QPatternist::XsdTypeChecker::checkConstrainingFacets(), QPatternist::AbstractFloatComparator::equals(), QPatternist::SubstringFN::evaluateSingleton(), QPatternist::GenericPredicate::mapToItem(), and QPatternist::AtomicValue::toQt().

toFloat()

virtual xsFloat QPatternist::Numeric::toFloat ( ) const

pure virtual

Returns

the particular number's value as a native representation of the type xs:float. This can be considered that the value is cast to xs:float.

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::AbstractFloat< isDouble >, QPatternist::Decimal, and QPatternist::Integer.

toInteger()

virtual xsInteger QPatternist::Numeric::toInteger ( ) const

pure virtual

Returns

the particular number's value as a native representation of the type xs:integer. This can be considered that the value is cast to xs:integer.

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::AbstractFloat< isDouble >, QPatternist::Decimal, and QPatternist::Integer.

Referenced by QPatternist::DecimalMathematician::calculate(), QPatternist::IntegerMathematician::calculate(), QPatternist::XsdTypeChecker::checkConstrainingFacets(), QPatternist::SubsequenceFN::compress(), QPatternist::SubsequenceFN::evaluateSequence(), QPatternist::SubsequenceFN::staticType(), and QPatternist::AtomicValue::toQt().

toNegated()

virtual Item QPatternist::Numeric::toNegated ( ) const

pure virtual

Unary minus.

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::Decimal, QPatternist::AbstractFloat< isDouble >, and QPatternist::Integer.

toUnsignedInteger()

virtual qulonglong QPatternist::Numeric::toUnsignedInteger ( ) const

pure virtual

Returns

the number as an unsigned integer. If the value is not unsigned, the code asserts and behavior is undefined.

Implemented in QPatternist::DerivedInteger< DerivedType >, QPatternist::AbstractFloat< isDouble >, QPatternist::Decimal, and QPatternist::Integer.

Referenced by QPatternist::XsdTypeChecker::checkConstrainingFacets().

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The documentation for this class was generated from the following files:

• /src/xmlpatterns/data/qschemanumeric_p.h
• /src/xmlpatterns/data/qschemanumeric.cpp