Constructs a namespace on an element, and naturally only appears as a child of ElementConstructor. More...

#include <qcomputednamespaceconstructor_p.h>

Inheritance diagram for QPatternist::ComputedNamespaceConstructor:

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

	ComputedNamespaceConstructor (const Expression::Ptr &prefix, const Expression::Ptr &namespaceURI)

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

virtual SequenceType::List	expectedOperandTypes () const

virtual Expression::Properties	properties () const

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

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

virtual Item	evaluateSingleton (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

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 ()

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::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

Constructs a namespace on an element, and naturally only appears as a child of ElementConstructor.

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

Since: 4.5

Definition at line 71 of file qcomputednamespaceconstructor_p.h.

Constructors and Destructors

◆ ComputedNamespaceConstructor()

ComputedNamespaceConstructor::ComputedNamespaceConstructor	(	const Expression::Ptr &	prefix,
		const Expression::Ptr &	namespaceURI
	)

Definition at line 54 of file qcomputednamespaceconstructor.cpp.

                                                                                               : PairContainer(prefix, namespaceURI)
 {
 }

Functions

◆ accept()

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

virtual

Implements QPatternist::Expression.

Definition at line 131 of file qcomputednamespaceconstructor.cpp.

 {
     return visitor->visit(this);
 }

◆ evaluateToSequenceReceiver()

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

virtual

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

Reimplemented from QPatternist::Expression.

Definition at line 59 of file qcomputednamespaceconstructor.cpp.

 {
     const Item prefixItem(m_operand1->evaluateSingleton(context));
     const QString prefix(prefixItem ? prefixItem.stringValue() : QString());
 
     const Item namespaceItem(m_operand2->evaluateSingleton(context));
     const QString namespaceURI(namespaceItem ? namespaceItem.stringValue() : QString());
 
     if(namespaceURI.isEmpty())
     {
         context->error(QtXmlPatterns::tr("In a namespace constructor, the value for a namespace cannot be an empty string."),
                        ReportContext::XTDE0930,
                        this);
     }
 
     /* One optimization could be to store a pointer to
      * the name pool as a member in order to avoid the virtual call(s). */
     const NamePool::Ptr np(context->namePool());
 
     if(!prefix.isEmpty() && !QXmlUtils::isNCName(prefix))
     {
         context->error(QtXmlPatterns::tr("The prefix must be a valid %1, which %2 is not.")
                                         .arg(formatType(np, BuiltinTypes::xsNCName),
                                              formatKeyword(prefix)),
                        ReportContext::XTDE0920,
                        this);
     }
     const QXmlName binding(np->allocateBinding(prefix, namespaceURI));
 
     AnyURI::toQUrl<ReportContext::XTDE0905, DynamicContext::Ptr>(namespaceURI,
                                                                  context,
                                                                  this);
 
     if(binding.prefix() == StandardPrefixes::xmlns)
     {
         context->error(QtXmlPatterns::tr("The prefix %1 cannot be bound.")
                                         .arg(formatKeyword(prefix)),
                        ReportContext::XTDE0920,
                        this);
     }
 
     if((binding.prefix() == StandardPrefixes::xml && binding.namespaceURI() != StandardNamespaces::xml)
        ||
        (binding.prefix() != StandardPrefixes::xml && binding.namespaceURI() == StandardNamespaces::xml))
     {
         context->error(QtXmlPatterns::tr("Only the prefix %1 can be bound to %2 and vice versa.")
                                         .arg(formatKeyword(prefix), formatKeyword(namespaceURI)),
                        ReportContext::XTDE0925,
                        this);
     }
 
      context->outputReceiver()->namespaceBinding(binding);
 }

◆ expectedOperandTypes()

SequenceType::List ComputedNamespaceConstructor::expectedOperandTypes ( ) const

virtual

Returns: a list containing one CommonSequenceTypes::ExactlyOneString instance.

Implements QPatternist::Expression.

Definition at line 118 of file qcomputednamespaceconstructor.cpp.

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

◆ properties()

Expression::Properties ComputedNamespaceConstructor::properties ( ) const

virtual

Returns: a bitwise OR'd value of properties, describing the characteristics of the expression. These properties affects how this Expression is treated in for example type checking stages.

The default implementation returns 0. Override and let the function return a different value, if that's of interest.

An important decision when re-implementing properties() is whether to OR in the properties() of ones operands. For instance, if an operand has RequiresFocus set, that flag nost likely applies to the apparent as well, since it depends on its operand.

See also: deepProperties()

Returns: Expression::None, meaning no special properties

Reimplemented from QPatternist::Expression.

Definition at line 126 of file qcomputednamespaceconstructor.cpp.

 {
     return DisableElimination | IsNodeConstructor;
 }

◆ staticType()

SequenceType::Ptr ComputedNamespaceConstructor::staticType ( ) const

virtual

The static type is exactly one attribute node. It's unclear what affects the static type has, but specifying anything else could lead to complications wrt. node order, XQTY0024. Of course, it's not conceptually correct, since a namespace node isn't an attribute node.

Implements QPatternist::Expression.

Definition at line 113 of file qcomputednamespaceconstructor.cpp.

 {
     return CommonSequenceTypes::ExactlyOneAttribute;
 }

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

/src/xmlpatterns/expr/qcomputednamespaceconstructor_p.h
/src/xmlpatterns/expr/qcomputednamespaceconstructor.cpp

Public Functions

Additional Inherited Members

Detailed Description

Constructors and Destructors

◆ ComputedNamespaceConstructor()

Functions

◆ accept()

◆ evaluateToSequenceReceiver()

◆ expectedOperandTypes()

◆ properties()

◆ staticType()