Qt 4.8
qcastas.cpp
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41 
42 #include "qitem_p.h"
43 #include "qbuiltintypes_p.h"
44 #include "qcardinalityverifier_p.h"
45 #include "qcommonsequencetypes_p.h"
46 #include "qemptysequence_p.h"
47 #include "qgenericsequencetype_p.h"
48 #include "qliteral_p.h"
49 #include "qpatternistlocale_p.h"
50 #include "qnamespaceresolver_p.h"
51 #include "qqnameconstructor_p.h"
52 #include "qqnamevalue_p.h"
53 #include "qatomicstring_p.h"
54 #include "qvalidationerror_p.h"
55 
56 #include "qcastas_p.h"
57 
59 
60 using namespace QPatternist;
61 
63  const SequenceType::Ptr &tType) : SingleContainer(source),
64  m_targetType(tType)
65 {
66  Q_ASSERT(source);
67  Q_ASSERT(tType);
68  Q_ASSERT(!tType->cardinality().allowsMany());
69  Q_ASSERT(tType->itemType()->isAtomicType());
70 }
71 
73 {
74  Q_ASSERT(context);
75  const Item val(m_operand->evaluateSingleton(context));
76 
77  if(val)
78  return cast(val, context);
79  else
80  {
81  /* No item supplied, let's handle the cardinality part. */
82 
84  return Item();
85  else
86  {
87  Q_ASSERT(context);
88  context->error(QtXmlPatterns::tr("Type error in cast, expected %1, "
89  "received %2.")
93  return Item();
94  }
95  }
96 }
97 
99  const SequenceType::Ptr &reqType)
100 {
101  checkTargetType(context);
102  const SequenceType::Ptr seqt(m_operand->staticType());
103  ItemType::Ptr t(seqt->itemType());
104 
105  /* Special case xs:QName */
106  if(BuiltinTypes::xsQName->xdtTypeMatches(m_targetType->itemType()))
107  {
108  /* Ok, We're casting to xs:QName. */
109  if(m_operand->is(IDStringValue)) /* A valid combination, let's do the cast. */
110  return castToQName(context)->typeCheck(context, reqType);
111  else if(BuiltinTypes::xsQName->xdtTypeMatches(t))
112  return m_operand->typeCheck(context, reqType);
113  else if(seqt->cardinality().isEmpty() && m_targetType->cardinality().allowsEmpty())
114  return EmptySequence::create(this, context);
115  else if(!(seqt->cardinality().isEmpty() && !m_targetType->cardinality().allowsEmpty()))
116  {
117  context->error(QtXmlPatterns::tr("When casting to %1 or types "
118  "derived from it, the source "
119  "value must be of the same type, "
120  "or it must be a string literal. "
121  "Type %2 is not allowed.")
122  .arg(formatType(context->namePool(), BuiltinTypes::xsQName))
123  .arg(formatType(context->namePool(), seqt)),
125  return Expression::Ptr(this);
126  }
127  }
128 
129  const Expression::Ptr me(SingleContainer::typeCheck(context, reqType));
130  /* Type may have changed, such as that atomization has been applied. */
131  t = m_operand->staticType()->itemType();
132 
134  !BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t) &&
135  !BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t))
136  { /* At least casting is superflorous. */
138  return m_operand; /* The whole cast expression is redundant. */
139  else
140  { /* Only cardinality check is needed, rewrite to CardinalityVerifier. */
144  }
145  }
146 
147  /* Let the CastingPlatform look up its AtomicCaster. */
148  prepareCasting(context, t);
149 
150  return me;
151 }
152 
154 {
155  /* Simplify casts to itself. */
157  return m_operand->compress(context);
158  else
159  return SingleContainer::compress(context);
160 }
161 
163 {
164  /* Apply the whitespace facet by calling trimmed(). */
165  /* We can assume m_operand is an Expression because this is a requirement
166  * for casting to xs:QName. */
167  const QString lexQName(m_operand->as<Literal>()->item().as<AtomicValue>()->stringValue().trimmed());
168 
169  const QXmlName
172  ReportContext::FONS0004>(lexQName,
173  context,
174  context->namespaceBindings(), this));
175  return wrapLiteral(toItem(QNameValue::fromValue(context->namePool(), expName)), context, this);
176 }
177 
179 {
181  return m_targetType;
182  else
183  return makeGenericSequenceType(m_targetType->itemType(),
185 }
186 
188 {
189  SequenceType::List result;
190 
193  else
195 
196  return result;
197 }
198 
200 {
201  return visitor->visit(this);
202 }
203 
static const AtomicType::Ptr xsDayTimeDuration
Item cast(const Item &sourceValue, const ReportContext::Ptr &context) const
#define QT_END_NAMESPACE
This macro expands to.
Definition: qglobal.h:90
Verifies that the sequence an Expression evaluates to conforms to a Cardinality.
QString formatType(const NamePool::Ptr &np, const T &type)
Formats ItemType and SequenceType.
Due to strong interdependencies, this file contains the definitions for the classes Item...
virtual SequenceType::Ptr staticType() const
Definition: qcastas.cpp:178
virtual NamePool::Ptr namePool() const =0
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, const SequenceType::Ptr &reqType)
Definition: qexpression.cpp:70
Item item() const
Definition: qliteral_p.h:102
Item toItem(const QExplicitlySharedDataPointer< T > atomicValue)
Definition: qitem_p.h:431
static QXmlName expandQName(const QString &lexicalQName, const TReportContext &context, const NamespaceResolver::Ptr &nsResolver, const SourceLocationReflection *const r, const bool asForAttribute=false)
The QString class provides a Unicode character string.
Definition: qstring.h:83
static Expression::Ptr create(const Expression *const replacementFor, const StaticContext::Ptr &context)
Creates an EmptySequence that is a replacement for replacementFor.
#define Q_ASSERT(cond)
Definition: qglobal.h:1823
static const SequenceType::Ptr ExactlyOneAtomicType
static const AtomicType::Ptr xsYearMonthDuration
virtual Item evaluateSingleton(const DynamicContext::Ptr &) const
Definition: qcastas.cpp:72
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, const SequenceType::Ptr &reqType)
Definition: qcastas.cpp:98
virtual Expression::Ptr compress(const StaticContext::Ptr &context)
void append(const T &t)
Inserts value at the end of the list.
Definition: qlist.h:507
static Cardinality empty()
#define QT_BEGIN_NAMESPACE
This macro expands to.
Definition: qglobal.h:89
const TCastTarget * as() const
void error(const QString &message, const ReportContext::ErrorCode errorCode, const QSourceLocation &sourceLocation)
static QNameValue::Ptr fromValue(const NamePool::Ptr &np, const QXmlName name)
Definition: qqnamevalue.cpp:59
Base class for all classes representing atomic values.
Definition: qitem_p.h:118
CastAs(const Expression::Ptr &source, const SequenceType::Ptr &targetType)
Definition: qcastas.cpp:62
virtual Expression::Ptr compress(const StaticContext::Ptr &context)
Definition: qcastas.cpp:153
The namespace for the internal API of QtXmlPatterns.
bool prepareCasting(const ReportContext::Ptr &context, const ItemType::Ptr &sourceType)
virtual NamespaceResolver::Ptr namespaceBindings() const =0
virtual Cardinality cardinality() const =0
virtual SequenceType::List expectedOperandTypes() const
Definition: qcastas.cpp:187
Expression::Ptr castToQName(const StaticContext::Ptr &context) const
Definition: qcastas.cpp:162
Houses an AtomicValue, making it available as an Expression.
Definition: qliteral_p.h:74
QExplicitlySharedDataPointer< Expression > Ptr
A smart pointer wrapping mutable Expression instances.
virtual SequenceType::Ptr staticType() const =0
The QXmlName class represents the name of an XML node, in an efficient, namespace-aware way...
Definition: qxmlname.h:58
Contains functions used for formatting arguments, such as keywords and paths, in translated strings...
Represents an item in the XPath 2.0 Data Model.
Definition: qitem_p.h:182
static const AtomicType::Ptr xsQName
virtual bool isAtomicType() const =0
void checkTargetType(const ReportContext::Ptr &context) const
static Cardinality exactlyOne()
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const
Definition: qcastas.cpp:199
virtual bool xdtTypeMatches(const ItemType::Ptr &other) const =0
Returns true if other matches this type. That is, if other is equal to this type or a subtype of this...
virtual ItemType::Ptr itemType() const =0
bool isMatch(const Cardinality &other) const
TCastTarget * as() const
Definition: qitem_p.h:278
static const SequenceType::Ptr ZeroOrOneAtomicType
bool is(const ID id) const
virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const
const SequenceType::Ptr m_targetType
Definition: qcastas_p.h:140
The QList class is a template class that provides lists.
Definition: qdatastream.h:62
Base class for expressions that has exactly one operand.