Implements XPath 2.0's quantification expressions some and every. More...

#include <qquantifiedexpression_p.h>

Inheritance diagram for QPatternist::QuantifiedExpression:

Public Types
enum	Operator { Some = 1, Every }

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

Public Functions
virtual ExpressionVisitorResult::Ptr	accept (const ExpressionVisitor::Ptr &visitor) const

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

virtual SequenceType::List	expectedOperandTypes () const

Item	mapToItem (const Item &item, const DynamicContext::Ptr &context) const

Operator	operatorID () const

	QuantifiedExpression (const VariableSlotID varSlot, const Operator quantifier, const Expression::Ptr &inClause, const Expression::Ptr &testExpression)

virtual SequenceType::Ptr	staticType () const

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

virtual Expression::List	operands () const

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

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

virtual Item	evaluateSingleton (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

virtual ID	id () 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

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

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 ()

Static Public Functions
static QString	displayName (const Operator quantifier)

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

Private Types
typedef QExplicitlySharedDataPointer< const QuantifiedExpression >	ConstPtr

Properties
const Operator	m_quantifier

const VariableSlotID	m_varSlot

Additional Inherited Members
Public Variables inherited from QSharedData
QAtomicInt	ref

Protected Functions inherited from QPatternist::PairContainer
	PairContainer (const Expression::Ptr &operand1, const Expression::Ptr &operand2)

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

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

Protected Variables inherited from QPatternist::PairContainer
Expression::Ptr	m_operand1

Expression::Ptr	m_operand2

Detailed Description

Implements XPath 2.0's quantification expressions some and every.

See also: XML Path Language (XPath) 2.0, 3.9 Quantified Expressions

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

Definition at line 71 of file qquantifiedexpression_p.h.

Typedefs

◆ ConstPtr

typedef QExplicitlySharedDataPointer<const QuantifiedExpression> QPatternist::QuantifiedExpression::ConstPtr

private

Definition at line 104 of file qquantifiedexpression_p.h.

Enumerations

◆ Operator

enum QPatternist::QuantifiedExpression::Operator

Enumerator
Some
Every

Definition at line 74 of file qquantifiedexpression_p.h.

         {
             Some    = 1,
             Every
         };

Constructors and Destructors

◆ QuantifiedExpression()

QuantifiedExpression::QuantifiedExpression	(	const VariableSlotID	varSlot,
		const Operator	quantifier,
		const Expression::Ptr &	inClause,
		const Expression::Ptr &	testExpression
	)

Definition at line 52 of file qquantifiedexpression.cpp.

                                            : PairContainer(inClause, testExpression),
                                              m_varSlot(varSlot),
                                              m_quantifier(quantifier)
 {
     Q_ASSERT(quantifier == Some || quantifier == Every);
 }

Functions

◆ accept()

ExpressionVisitorResult::Ptr QuantifiedExpression::accept ( const ExpressionVisitor::Ptr & visitor ) const

virtual

Implements QPatternist::Expression.

Definition at line 135 of file qquantifiedexpression.cpp.

 {
     return visitor->visit(this);
 }

◆ displayName()

QString QuantifiedExpression::displayName ( const Operator quantifier )

static

Determines the string representation for a quantification operator.

Returns: "some" if quantifier is Some, or "every" if quantifier is Every

Definition at line 106 of file qquantifiedexpression.cpp.

 {
     if(quantifier == Some)
         return QLatin1String("some");
     else
     {
         Q_ASSERT(quantifier == Every);
         return QLatin1String("every");
     }
 }

◆ evaluateEBV()

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

virtual

Determines the Effective Boolean Value of the expression.

The Effective Boolean Value of a value is not necessarily the same as converting the value to a new value of type xs:boolean.

Note that this function cannot return the empty sequence, evaluateSingleton() must be overridden in order to be able to do that.

The default implementation results in a type error. Hence, this function must be overridden if such behavior is not of interest.

See also: XML Path Language (XPath) 2.0, 2.4.3 Effective Boolean Value

Reimplemented from QPatternist::Expression.

Definition at line 70 of file qquantifiedexpression.cpp.

 {
     const Item::Iterator::Ptr it(makeItemMappingIterator<Item>(ConstPtr(this),
                                                                m_operand1->evaluateSequence(context),
                                                                context));
 
     Item item(it->next());
 
     if(m_quantifier == Some)
     {
         while(item)
         {
             if(m_operand2->evaluateEBV(context))
                 return true;
             else
                 item = it->next();
         };
 
         return false;
     }
     else
     {
         Q_ASSERT(m_quantifier == Every);
 
         while(item)
         {
             if(m_operand2->evaluateEBV(context))
                 item = it->next();
             else
                 return false;
         }
 
         return true;
     }
 }

◆ expectedOperandTypes()

SequenceType::List QuantifiedExpression::expectedOperandTypes ( ) const

virtual

Returns a list of Sequence Types, describing the type of each of the expression's operands. Hence, this function has a relationship to the operands() function:

- The lengths of the lists returned by expectedOperandTypes()
and operands() should always be equal in length, since one
cannot describe the type of a non-existent operand(and all
operands must have type information).
- A significant difference between the two functions is that while
the type of objects in the list returned by operands() may vary
between compilations/static context, simply because the particular
Expression is part of different XPath expressions, the
types in the list returned by expectedOperandTypes is always the same
since the function/operator signature never changes.

This function should not be confused with staticType(), which returns the static type of the expression itself, not its operands. The function call is an expression where this is clear: the type of the return value is not the same as the arguments' types. The static type of the operands supplied to the expression can be determined via the staticType() function of the instances returned by operands().

If the expression has no operands, an empty list should be returned.

Implements QPatternist::Expression.

Definition at line 122 of file qquantifiedexpression.cpp.

 {
     SequenceType::List result;
     result.append(CommonSequenceTypes::ZeroOrMoreItems);
     result.append(CommonSequenceTypes::EBV);
     return result;
 }

◆ mapToItem()

Item QuantifiedExpression::mapToItem	(	const Item &	item,
		const DynamicContext::Ptr &	context
	)		const

inline

Definition at line 63 of file qquantifiedexpression.cpp.

 {
     context->setRangeVariable(m_varSlot, item);
     return item;
 }

◆ operatorID()

QuantifiedExpression::Operator QuantifiedExpression::operatorID ( ) const

Definition at line 130 of file qquantifiedexpression.cpp.

 {
     return m_quantifier;
 }

◆ staticType()

SequenceType::Ptr QuantifiedExpression::staticType ( ) const

virtual

Returns: the static type of this Expression. For example, an 'and' expression have as static type xs:boolean

Implements QPatternist::Expression.

Definition at line 117 of file qquantifiedexpression.cpp.

 {
     return CommonSequenceTypes::ExactlyOneBoolean;
 }

Properties

◆ m_quantifier

const Operator QPatternist::QuantifiedExpression::m_quantifier

private

Definition at line 106 of file qquantifiedexpression_p.h.

Referenced by evaluateEBV(), and operatorID().

◆ m_varSlot

const VariableSlotID QPatternist::QuantifiedExpression::m_varSlot

private

Definition at line 105 of file qquantifiedexpression_p.h.

Referenced by mapToItem().

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

/src/xmlpatterns/expr/qquantifiedexpression_p.h
/src/xmlpatterns/expr/qquantifiedexpression.cpp

Public Types

Public Functions

Static Public Functions

Private Types

Properties

Additional Inherited Members

Detailed Description

Typedefs

◆ ConstPtr

Enumerations

◆ Operator

Constructors and Destructors

◆ QuantifiedExpression()

Functions

◆ accept()

◆ displayName()

◆ evaluateEBV()

◆ expectedOperandTypes()

◆ mapToItem()

◆ operatorID()

◆ staticType()

Properties

◆ m_quantifier

◆ m_varSlot