Qt 4.8
Public Functions | List of all members
QPatternist::InsertBeforeFN Class Reference

Implements the function fn:insert-before(). More...

#include <qsequencefns_p.h>

Inheritance diagram for QPatternist::InsertBeforeFN:
QPatternist::FunctionCall QPatternist::UnlimitedContainer QPatternist::Expression QSharedData QPatternist::CppCastingHelper< Expression > QPatternist::SourceLocationReflection

Public Functions

virtual Item::Iterator::Ptr evaluateSequence (const DynamicContext::Ptr &context) const
 
virtual Item evaluateSingleton (const DynamicContext::Ptr &context) const
 
virtual SequenceType::Ptr staticType () const
 
- 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 Expression::Ptr typeCheck (const StaticContext::Ptr &context, const SequenceType::Ptr &reqType)
 
- 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 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 Variables inherited from QPatternist::UnlimitedContainer
Expression::List m_operands
 

Detailed Description

Implements the function fn:insert-before().

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

Definition at line 230 of file qsequencefns_p.h.

Functions

◆ evaluateSequence()

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

Evaluate this Expression by iterating over it. This is a central function for evaluating expressions.

Expressions must always always return a valid QAbstractXmlForwardIterator and may never return 0. If an empty result is of interest to be returned, the EmptyIterator should be returned.

The default implementation returns a SingletonIterator over the item returned from evaluateSingleton().

Note
This function may raise an exception when calling, not only when QAbstractXmlForwardIterator::next() is called on the return value. This is because in some cases evaluateSingleton() is called directly.

Reimplemented from QPatternist::Expression.

Definition at line 135 of file qsequencefns.cpp.

136 {
137  const Item::Iterator::Ptr target(m_operands.first()->evaluateSequence(context));
138  const Item::Iterator::Ptr inserts(m_operands.at(2)->evaluateSequence(context));
139 
140  xsInteger position = m_operands.at(1)->evaluateSingleton(context).as<Numeric>()->toInteger();
141 
142  if(position < 1)
143  position = 1;
144 
145  return Item::Iterator::Ptr(new InsertionIterator(target, position, inserts));
146 }
QPatternist::xsInteger
qint64 xsInteger
Definition: qprimitives_p.h:130
position
static qreal position(QGraphicsObject *item, QDeclarativeAnchorLine::AnchorLine anchorLine)
Definition: qdeclarativeanchors.cpp:82
QExplicitlySharedDataPointer
The QExplicitlySharedDataPointer class represents a pointer to an explicitly shared object...
Definition: qshareddata.h:136
QAbstractXmlForwardIterator< Item >::Ptr
QExplicitlySharedDataPointer< QAbstractXmlForwardIterator< Item > > Ptr
A smart pointer wrapping an instance of a QAbstractXmlForwardIterator subclass.
Definition: qabstractxmlforwarditerator_p.h:98
QList::at
const T & at(int i) const
Returns the item at index position i in the list.
Definition: qlist.h:468
QList::first
T & first()
Returns a reference to the first item in the list.
Definition: qlist.h:282
QPatternist::InsertionIterator
Conceptually inserts one QAbstractXmlForwardIterator into another, make two QAbstractXmlForwardIterat...
Definition: qinsertioniterator_p.h:81
QPatternist::Numeric
Base class for all numeric values.
Definition: qschemanumeric_p.h:90
QPatternist::Item::as
TCastTarget * as() const
Definition: qitem_p.h:278
QPatternist::Expression::evaluateSingleton
virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const
Definition: qexpression.cpp:310
QPatternist::Expression::evaluateSequence
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const
Definition: qexpression.cpp:300

◆ evaluateSingleton()

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

Reimplemented from QPatternist::Expression.

Definition at line 148 of file qsequencefns.cpp.

149 {
150  return evaluateSequence(context)->next();
151 }
QPatternist::InsertBeforeFN::evaluateSequence
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const
Definition: qsequencefns.cpp:135

◆ staticType()

SequenceType::Ptr InsertBeforeFN::staticType ( ) const
virtual

Implements the static enferences rules. The function's static item type is the union type of the first and third argument, and the cardinality is the cardinalities of the two operands added together. For example, insert-before((1, "str"), 1, xs:double(0)) has the static type xs:anyAtomicType+.

See also
XQuery 1.0 and XPath 2.0 Formal Semantics, 7.2.15 The fn:insert-before function

Reimplemented from QPatternist::FunctionCall.

Definition at line 153 of file qsequencefns.cpp.

154 {
155  const SequenceType::Ptr t1(m_operands.first()->staticType());
156  const SequenceType::Ptr t2(m_operands.last()->staticType());
157 
158  return makeGenericSequenceType(t1->itemType() | t2->itemType(),
159  t1->cardinality() + t2->cardinality());
160 }
QList::first
T & first()
Returns a reference to the first item in the list.
Definition: qlist.h:282
QPatternist::Expression::staticType
virtual SequenceType::Ptr staticType() const =0
QList::last
T & last()
Returns a reference to the last item in the list.
Definition: qlist.h:284
The documentation for this class was generated from the following files:
Qt 4.8 Source Code Browser