Implements the function fn:number(). More...

#include <qnodefns_p.h>

Inheritance diagram for QPatternist::NumberFN:

Public Functions
virtual Item	evaluateSingleton (const DynamicContext::Ptr &context) const

ItemType::Ptr	targetType () const

virtual Expression::Ptr	typeCheck (const StaticContext::Ptr &context, const SequenceType::Ptr &reqType)

Public Functions inherited from QPatternist::FunctionCall
virtual ExpressionVisitorResult::Ptr	accept (const ExpressionVisitor::Ptr &visitor) const

virtual SequenceType::List	expectedOperandTypes () const

virtual ID	id () const

virtual Expression::Properties	properties () const

virtual void	setSignature (const FunctionSignature::Ptr &sign)

virtual FunctionSignature::Ptr	signature () const

virtual SequenceType::Ptr	staticType () const

Public Functions inherited from QPatternist::UnlimitedContainer
virtual bool	compressOperands (const StaticContext::Ptr &)

virtual Expression::List	operands () const

virtual void	setOperands (const Expression::List &list)

	UnlimitedContainer (const Expression::List &operands=Expression::List())

Public Functions inherited from QPatternist::Expression
virtual const SourceLocationReflection *	actualReflection () const
	Returns `this`. More...

virtual void	announceFocusType (const ItemType::Ptr &itemType)

virtual Expression::Ptr	compress (const StaticContext::Ptr &context)

Properties	deepProperties () const
	Computes the union of properties for this Expression and all its descending children. More...

virtual Properties	dependencies () const

virtual QString	description () const

virtual bool	evaluateEBV (const DynamicContext::Ptr &context) const

virtual Item::Iterator::Ptr	evaluateSequence (const DynamicContext::Ptr &context) const

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

virtual ItemType::Ptr	expectedContextItemType () const

	Expression ()

bool	has (const Property prop) const

bool	hasDependency (const Property prop) const

bool	is (const ID id) const

bool	isEvaluated () const

virtual ItemType::Ptr	newFocusType () const

virtual QList< QExplicitlySharedDataPointer< OptimizationPass > >	optimizationPasses () const

virtual PatternPriority	patternPriority () const

const Expression::Ptr &	rewrite (const Expression::Ptr &to, const StaticContext::Ptr &context) const
	Rewrites this Expression to `to`, and return `to`. More...

virtual	~Expression ()

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< Expression >
const TCastTarget *	as () const

TCastTarget *	as ()

Public Functions inherited from QPatternist::SourceLocationReflection
virtual QSourceLocation	sourceLocation () const

	SourceLocationReflection ()

virtual	~SourceLocationReflection ()

Additional Inherited Members
Public Types inherited from QPatternist::FunctionCall
typedef QExplicitlySharedDataPointer< FunctionCall >	Ptr

Public Types inherited from QPatternist::UnlimitedContainer
enum	CardinalityComputation { ProductOfCardinality, UnionOfCardinality }

Public Types inherited from QPatternist::Expression
typedef QExplicitlySharedDataPointer< const Expression >	ConstPtr
	A smart pointer wrapping `const` Expression instances. More...

enum	ID { IDBooleanValue = 1, IDCountFN, IDEmptyFN, IDExistsFN, IDExpressionSequence, IDGeneralComparison, IDIfThenClause, IDIgnorableExpression, IDIntegerValue, IDPositionFN, IDStringValue, IDValueComparison, IDRangeVariableReference, IDContextItem, IDUserFunctionCallsite, IDExpressionVariableReference, IDAttributeConstructor, IDUpperCaseFN, IDLowerCaseFN, IDFirstItemPredicate, IDEmptySequence, IDReturnOrderBy, IDLetClause, IDForClause, IDPath, IDNamespaceConstructor, IDArgumentReference, IDGenericPredicate, IDAxisStep, IDFloat, IDCombineNodes, IDUnresolvedVariableReference, IDCardinalityVerifier }

typedef QList< Expression::Ptr >	List

typedef QFlags< Property >	Properties

enum	Property { UseContextItem = 1, DisableElimination = 1 << 1, IsEvaluated = 1 << 2, DisableTypingDeduction = 1 << 3, EmptynessFollowsChild = 1 << 4, RewriteToEmptyOnEmpty = 1 << 5, RequiresFocus = 1 << 6, AffectsOrderOnly = 1 << 7, RequiresContextItem = (1 << 8) \| RequiresFocus, CreatesFocusForLast = 1 << 9, LastOperandIsCollation = 1 << 10, DependsOnLocalVariable = (1 << 11) \| DisableElimination, EvaluationCacheRedundant = (1 << 12), IsNodeConstructor = 1 << 13, RequiresCurrentItem = 1 << 14 }

typedef QExplicitlySharedDataPointer< Expression >	Ptr
	A smart pointer wrapping mutable Expression instances. More...

typedef ::QAbstractXmlForwardIterator< Expression::Ptr >	QAbstractXmlForwardIterator

typedef QVector< Expression::Ptr >	Vector

Static Public Functions inherited from QPatternist::Expression
static void	rewrite (Expression::Ptr &old, const Expression::Ptr &New, const StaticContext::Ptr &context)

Public Variables inherited from QSharedData
QAtomicInt	ref

Protected Functions inherited from QPatternist::UnlimitedContainer
template<CardinalityComputation suppliedCard>
SequenceType::Ptr	operandsUnionType () const

Protected Functions inherited from QPatternist::Expression
void	typeCheckOperands (const StaticContext::Ptr &context)

Protected Functions inherited from QPatternist::CppCastingHelper< Expression >
	CppCastingHelper ()

Protected Functions inherited from QPatternist::CastingPlatform< NumberFN, false >
Item	cast (const Item &sourceValue, const ReportContext::Ptr &context) const

	CastingPlatform (const ReportContext::ErrorCode code=ReportContext::FORG0001)

void	checkTargetType (const ReportContext::Ptr &context) const

bool	prepareCasting (const ReportContext::Ptr &context, const ItemType::Ptr &sourceType)

Protected Variables inherited from QPatternist::UnlimitedContainer
Expression::List	m_operands

Detailed Description

Implements the function fn:number().

NumberFN uses CastingPlatform for performing the actual casting.

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

Definition at line 117 of file qnodefns_p.h.

Functions

◆ evaluateSingleton()

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

virtual

Reimplemented from QPatternist::Expression.

Definition at line 108 of file qnodefns.cpp.

 {
     const Item item(m_operands.first()->evaluateSingleton(context));
 
     if(!item)
         return CommonValues::DoubleNaN;
 
     const Item val(cast(item, context));
     Q_ASSERT(val);
 
     if(val.as<AtomicValue>()->hasError())
         return CommonValues::DoubleNaN;
     else
         return val;
 }

◆ targetType()

ItemType::Ptr QPatternist::NumberFN::targetType ( ) const

inline

Returns: always BuiltinTypes::xsDouble.

Definition at line 134 of file qnodefns_p.h.

         {
             return BuiltinTypes::xsDouble;
         }

◆ typeCheck()

Expression::Ptr NumberFN::typeCheck	(	const StaticContext::Ptr &	context,
		const SequenceType::Ptr &	reqType
	)

virtual

Overridden in order to call CastingPlatform::prepareCasting(). It also implements the optimization of rewriting to its operand if its type is xs:double(since the fn:number() call is in that case superflorous).

Reimplemented from QPatternist::FunctionCall.

Definition at line 124 of file qnodefns.cpp.

 {
     const Expression::Ptr me(FunctionCall::typeCheck(context, reqType));
     const ItemType::Ptr sourceType(m_operands.first()->staticType()->itemType());
 
     if(BuiltinTypes::xsDouble->xdtTypeMatches(sourceType))
     {
         /* The operand is already xs:double, no need for fn:number(). */
         return m_operands.first()->typeCheck(context, reqType);
     }
     else if(prepareCasting(context, sourceType))
         return me;
     else
     {
         /* Casting to xs:double will never succeed and we would always return NaN.*/
         return wrapLiteral(CommonValues::DoubleNaN, context, this)->typeCheck(context, reqType);
     }
 }

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

/src/xmlpatterns/functions/qnodefns_p.h
/src/xmlpatterns/functions/qnodefns.cpp

Public Functions

Additional Inherited Members

Detailed Description

Functions

◆ evaluateSingleton()

◆ targetType()

◆ typeCheck()