Implements XSL-T's construction of simple content, which is different from XQuery's approach. More...

#include <qxsltsimplecontentconstructor_p.h>

Inheritance diagram for QPatternist::XSLTSimpleContentConstructor:

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

virtual SequenceType::List	expectedOperandTypes () const

virtual SequenceType::Ptr	staticType () const

	XSLTSimpleContentConstructor (const Expression::Ptr &source)

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

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

	SimpleContentConstructor (const Expression::Ptr &operand)

Public Functions inherited from QPatternist::SingleContainer
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)

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

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 Private Functions
static QString	processItem (const Item &item, bool &discard, bool &isText)

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::SingleContainer
	SingleContainer (const Expression::Ptr &operand)

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::SingleContainer
Expression::Ptr	m_operand

Detailed Description

Implements XSL-T's construction of simple content, which is different from XQuery's approach.

See also: XSL Transformations (XSLT) Version 2.0, 5.7.2 Constructing Simple Content

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

Definition at line 71 of file qxsltsimplecontentconstructor_p.h.

Constructors and Destructors

◆ XSLTSimpleContentConstructor()

XSLTSimpleContentConstructor::XSLTSimpleContentConstructor ( const Expression::Ptr & source )

Definition at line 51 of file qxsltsimplecontentconstructor.cpp.

                                                                                       : SimpleContentConstructor(source)
 {
 }

Functions

◆ evaluateSingleton()

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

virtual

Reimplemented from QPatternist::SimpleContentConstructor.

Definition at line 100 of file qxsltsimplecontentconstructor.cpp.

 {
     const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
 
     Item next(it->next());
     QString result;
 
     bool previousIsText = false;
     bool discard = false;
 
     if(next)
     {
         const QString unit(processItem(next, discard, previousIsText));
 
         if(!discard)
             result = unit;
 
         next = it->next();
     }
     else
         return Item();
 
     while(next)
     {
         bool currentIsText = false;
         const QString unit(processItem(next, discard, currentIsText));
 
         if(!discard)
         {
             /* "Adjacent text nodes in the sequence are merged into a single text
              * node." */
             if(previousIsText && currentIsText)
                 ;
             else
                 result += QLatin1Char(' ');
 
             result += unit;
         }
 
         next = it->next();
         previousIsText = currentIsText;
     }
 
     return AtomicString::fromValue(result);
 }

◆ expectedOperandTypes()

SequenceType::List XSLTSimpleContentConstructor::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.

Reimplemented from QPatternist::SimpleContentConstructor.

Definition at line 146 of file qxsltsimplecontentconstructor.cpp.

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

◆ processItem()

QString XSLTSimpleContentConstructor::processItem	(	const Item &	item,
		bool &	discard,
		bool &	isText
	)

inlinestaticprivate

Definition at line 55 of file qxsltsimplecontentconstructor.cpp.

Referenced by evaluateSingleton().

 {
     if(item.isNode())
     {
         isText = (item.asNode().kind() == QXmlNodeModelIndex::Text);
 
         if(isText)
         {
             const QString value(item.stringValue());
 
             /* "1. Zero-length text nodes in the sequence are discarded." */
             discard = value.isEmpty();
             return value;
         }
         else
         {
             Item::Iterator::Ptr it(item.sequencedTypedValue()); /* Atomic values. */
             Item next(it->next());
             QString result;
 
             if(next)
                 result = next.stringValue();
 
             next = it->next();
 
             while(next)
             {
                 result += next.stringValue();
                 result += QLatin1Char(' ');
                 next = it->next();
             }
 
             return result;
         }
     }
     else
     {
         discard = false;
         isText = false;
         return item.stringValue();
     }
 }

◆ staticType()

SequenceType::Ptr XSLTSimpleContentConstructor::staticType ( ) const

virtual

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

Reimplemented from QPatternist::SimpleContentConstructor.

Definition at line 153 of file qxsltsimplecontentconstructor.cpp.

 {
     return CommonSequenceTypes::ZeroOrOneString;
 }

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

/src/xmlpatterns/expr/qxsltsimplecontentconstructor_p.h
/src/xmlpatterns/expr/qxsltsimplecontentconstructor.cpp

Public Functions

Static Private Functions

Additional Inherited Members

Detailed Description

Constructors and Destructors

◆ XSLTSimpleContentConstructor()

Functions

◆ evaluateSingleton()

◆ expectedOperandTypes()

◆ processItem()

◆ staticType()