Houses an AtomicValue, making it available as an Expression. More...

#include <qliteral_p.h>

Inheritance diagram for QPatternist::Literal:

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

virtual QString	description () const

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

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

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

virtual ID	id () const

Item	item () const

	Literal (const Item &item)

virtual Properties	properties () const

virtual SequenceType::Ptr	staticType () const

Public Functions inherited from QPatternist::EmptyContainer
virtual Expression::List	operands () const

virtual void	setOperands (const 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 Item::Iterator::Ptr	evaluateSequence (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::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 ()

Properties
const Item	m_item

Related Functions
(Note that these are not member functions.)
Expression::Ptr	wrapLiteral (const Item &item, const StaticContext::Ptr &context, const SourceLocationReflection *const r)
	Creates a Literal that wraps `item`, and returns it. More...

Additional Inherited Members
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::EmptyContainer
virtual bool	compressOperands (const StaticContext::Ptr &context)

virtual SequenceType::List	expectedOperandTypes () const

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

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

Detailed Description

Houses an AtomicValue, making it available as an Expression.

This is not only literals that can be created via the XQuery syntax(strings and numbers), but all other atomic values, such as xs:date or xs:time.

See also: XQuery 1.0: An XML Query Language, 3.1.1 Literals

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

Definition at line 74 of file qliteral_p.h.

Constructors and Destructors

◆ Literal()

Literal::Literal ( const Item & item )

Creates a Literal that represents item.

Parameters

item	must be non-null and cannot be a QXmlNodeModelIndex.

Definition at line 53 of file qliteral.cpp.

Referenced by wrapLiteral().

                               : m_item(i)
 {
     Q_ASSERT(m_item);
     Q_ASSERT(m_item.isAtomicValue());
 }

Functions

◆ accept()

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

virtual

Implements QPatternist::Expression.

Definition at line 79 of file qliteral.cpp.

 {
     return visitor->visit(this);
 }

◆ description()

QString Literal::description ( ) const

virtual

Reimplementation of SourceLocationReflection::description().

Reimplemented from QPatternist::Expression.

Definition at line 109 of file qliteral.cpp.

 {
     return m_item.stringValue();
 }

◆ evaluateEBV()

bool Literal::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 64 of file qliteral.cpp.

 {
     return Boolean::evaluateEBV(m_item, context);
 }

◆ evaluateSingleton()

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

virtual

Reimplemented from QPatternist::Expression.

Definition at line 59 of file qliteral.cpp.

 {
     return m_item;
 }

◆ evaluateToSequenceReceiver()

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

virtual

Evaluates this Expression by sending its output to DynamicContext::outputReceiver().

Reimplemented from QPatternist::Expression.

Definition at line 69 of file qliteral.cpp.

 {
     context->outputReceiver()->item(m_item);
 }

◆ id()

Expression::ID Literal::id ( ) const

virtual

This property, which has no setter, returns an enum value that uniquely identifies this Expression. Patternist makes no use of C++'s dynamic_cast feature, but uses this polymorphic function instead.

Returns: always IgnorableExpression.

Reimplemented from QPatternist::Expression.

Definition at line 84 of file qliteral.cpp.

 {
     Q_ASSERT(m_item);
     Q_ASSERT(m_item.isAtomicValue());
     const ItemType::Ptr t(m_item.type());
 
     if(BuiltinTypes::xsBoolean->xdtTypeMatches(t))
         return IDBooleanValue;
     else if(BuiltinTypes::xsString->xdtTypeMatches(t) ||
             BuiltinTypes::xsAnyURI->xdtTypeMatches(t) ||
             BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t))
     {
         return IDStringValue;
     }
     else if(BuiltinTypes::xsInteger->xdtTypeMatches(t))
         return IDIntegerValue;
     else
         return IDFloat;
 }

◆ item()

Item QPatternist::Literal::item ( ) const

inline

Declaring the return value of this function a const reference, leads to crashes in patternistview, for a to me unknown reason.

Definition at line 102 of file qliteral_p.h.

Referenced by QPatternist::CastAs::castToQName().

         {
             return m_item;
         }

◆ properties()

Expression::Properties Literal::properties ( ) const

virtual

Returns: Expression::DisableElimination and Expression::IsEvaluated

Reimplemented from QPatternist::Expression.

Definition at line 104 of file qliteral.cpp.

 {
     return IsEvaluated;
 }

◆ staticType()

SequenceType::Ptr Literal::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 74 of file qliteral.cpp.

 {
     return makeGenericSequenceType(m_item.type(), Cardinality::exactlyOne());
 }

Friends and Related Functions

◆ wrapLiteral()

Expression::Ptr wrapLiteral	(	const Item &	item,
		const StaticContext::Ptr &	context,
		const SourceLocationReflection *const	r
	)

This simplifies code. Instead of writing:

Expression::Ptr(new Literal(item));

One can write:

wrapLiteral(item);

This function is not declared static, because it breaks the build on at least aix-xlc-64.

Definition at line 131 of file qliteral_p.h.

     {
         Q_ASSERT(item);
 
         const Expression::Ptr retval(new Literal(item));
         context->addLocation(retval.data(), context->locationFor(r));
 
         return retval;
     }

Properties

◆ m_item

const Item QPatternist::Literal::m_item

private

Definition at line 108 of file qliteral_p.h.

Referenced by description(), evaluateEBV(), evaluateSingleton(), evaluateToSequenceReceiver(), id(), item(), Literal(), and staticType().

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

/src/xmlpatterns/expr/qliteral_p.h
/src/xmlpatterns/expr/qliteral.cpp

Public Functions

Properties

Related Functions

Additional Inherited Members

Detailed Description

Constructors and Destructors

◆ Literal()

Functions

◆ accept()

◆ description()

◆ evaluateEBV()

◆ evaluateSingleton()

◆ evaluateToSequenceReceiver()

◆ id()

◆ item()

◆ properties()

◆ staticType()

Friends and Related Functions

◆ wrapLiteral()

Properties

◆ m_item