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

Constructs a text node. This covers both computed and directly constructed text nodes. More...

#include <qtextnodeconstructor_p.h>

Inheritance diagram for QPatternist::TextNodeConstructor:
QPatternist::SingleContainer QPatternist::Expression QSharedData QPatternist::CppCastingHelper< Expression > QPatternist::SourceLocationReflection

Public Functions

virtual ExpressionVisitorResult::Ptr accept (const ExpressionVisitor::Ptr &visitor) const
 
virtual Item evaluateSingleton (const DynamicContext::Ptr &context) const
 
virtual void evaluateToSequenceReceiver (const DynamicContext::Ptr &context) const
 
virtual SequenceType::List expectedOperandTypes () const
 
virtual Properties properties () const
 
virtual SequenceType::Ptr staticType () const
 
 TextNodeConstructor (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 SourceLocationReflectionactualReflection () 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 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::Ptrrewrite (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 ExpressionConstPtr
 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::PtrList
 
typedef QFlags< PropertyProperties
 
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< ExpressionPtr
 A smart pointer wrapping mutable Expression instances. More...
 
typedef ::QAbstractXmlForwardIterator< Expression::PtrQAbstractXmlForwardIterator
 
typedef QVector< Expression::PtrVector
 
- 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

Constructs a text node. This covers both computed and directly constructed text nodes.

See also
XQuery 1.0: An XML Query Language, 3.7 Constructors
Author
Frans Englich frans.nosp@m..eng.nosp@m.lich@.nosp@m.noki.nosp@m.a.com

Definition at line 72 of file qtextnodeconstructor_p.h.

Constructors and Destructors

◆ TextNodeConstructor()

TextNodeConstructor::TextNodeConstructor ( const Expression::Ptr operand)

Definition at line 53 of file qtextnodeconstructor.cpp.

53  : SingleContainer(op)
54 {
55 }
SingleContainer(const Expression::Ptr &operand)

Functions

◆ accept()

ExpressionVisitorResult::Ptr TextNodeConstructor::accept ( const ExpressionVisitor::Ptr visitor) const
virtual

Implements QPatternist::Expression.

Definition at line 110 of file qtextnodeconstructor.cpp.

111 {
112  return visitor->visit(this);
113 }

◆ evaluateSingleton()

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

Reimplemented from QPatternist::Expression.

Definition at line 57 of file qtextnodeconstructor.cpp.

58 {
59  const Item chars(m_operand->evaluateSingleton(context));
60 
61  if(!chars)
62  return Item();
63 
64  const NodeBuilder::Ptr nodeBuilder(context->nodeBuilder(QUrl()));
65  const QString &v = chars.stringValue();
66  nodeBuilder->characters(QStringRef(&v));
67 
68  const QAbstractXmlNodeModel::Ptr nm(nodeBuilder->builtDocument());
69  context->addNodeModel(nm);
70 
71  return nm->root(QXmlNodeModelIndex());
72 }
The QXmlNodeModelIndex class identifies a node in an XML node model subclassed from QAbstractXmlNodeM...
virtual void addNodeModel(const QAbstractXmlNodeModel::Ptr &nm)=0
The QExplicitlySharedDataPointer class represents a pointer to an explicitly shared object...
Definition: qshareddata.h:136
The QUrl class provides a convenient interface for working with URLs.
Definition: qurl.h:61
The QString class provides a Unicode character string.
Definition: qstring.h:83
The QStringRef class provides a thin wrapper around QString substrings.
Definition: qstring.h:1099
Represents an item in the XPath 2.0 Data Model.
Definition: qitem_p.h:182
virtual NodeBuilder::Ptr nodeBuilder(const QUrl &baseURI) const =0
virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const

◆ evaluateToSequenceReceiver()

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

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

Reimplemented from QPatternist::Expression.

Definition at line 74 of file qtextnodeconstructor.cpp.

75 {
76  const Item item(m_operand->evaluateSingleton(context));
77 
78  QAbstractXmlReceiver *const receiver = context->outputReceiver();
79 
80  if(item)
81  {
82  const QString &v = item.stringValue();
83  receiver->characters(QStringRef(&v));
84  }
85  else
86  receiver->characters(QStringRef());
87 }
A push interface for the XPath Data Model. Similar to SAX&#39;s ContentHandler.
The QString class provides a Unicode character string.
Definition: qstring.h:83
The QStringRef class provides a thin wrapper around QString substrings.
Definition: qstring.h:1099
Represents an item in the XPath 2.0 Data Model.
Definition: qitem_p.h:182
virtual QAbstractXmlReceiver * outputReceiver() const =0
virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const

◆ expectedOperandTypes()

SequenceType::List TextNodeConstructor::expectedOperandTypes ( ) const
virtual

The first operand must be exactly one xs:string.

Implements QPatternist::Expression.

Definition at line 97 of file qtextnodeconstructor.cpp.

98 {
99  SequenceType::List result;
101  return result;
102 }
static const SequenceType::Ptr ZeroOrOneString
void append(const T &t)
Inserts value at the end of the list.
Definition: qlist.h:507
The QList class is a template class that provides lists.
Definition: qdatastream.h:62

◆ properties()

Expression::Properties TextNodeConstructor::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 104 of file qtextnodeconstructor.cpp.

◆ staticType()

SequenceType::Ptr TextNodeConstructor::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 89 of file qtextnodeconstructor.cpp.

90 {
93  else
95 }
static const SequenceType::Ptr ExactlyOneTextNode
virtual Cardinality cardinality() const =0
static const SequenceType::Ptr ZeroOrOneTextNode
virtual SequenceType::Ptr staticType() const =0

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