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39
40//
41// W A R N I N G
42// -------------
43//
44// This file is not part of the Qt API. It exists purely as an
45// implementation detail. This header file may change from version to
46// version without notice, or even be removed.
47//
48// We mean it.
49
50#ifndef Patternist_ContextItem_H
51#define Patternist_ContextItem_H
52
53#include <private/qemptycontainer_p.h>
54
55QT_BEGIN_NAMESPACE
56
57namespace QPatternist
58{
59 /**
60 * @short Implements the context item, the dot: <tt>.</tt>.
61 *
62 * @see <a href="http://www.w3.org/TR/xpath20/#id-context-item-expression">XML Path Language
63 * (XPath) 2.0, 3.1.4 Context Item Expression</a>
64 * @author Frans Englich <frans.englich@nokia.com>
65 * @ingroup Patternist_expressions
66 */
67 class ContextItem : public EmptyContainer
68 {
69 public:
70 /**
71 * @p expr is possibly used for error reporting. If this context item has been
72 * created implicitly, such as for the expression <tt>fn:string()</tt>, @p expr
73 * should be passed a valid pointer to the Expression that this context
74 * item is generated for.
75 */
76 inline ContextItem(const Expression::Ptr &expr = Expression::Ptr()) : m_expr(expr)
77 {
78 }
79
80 virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
81 virtual SequenceType::Ptr staticType() const;
82
83 /**
84 * @returns always DisableElimination and RequiresContextItem
85 */
86 virtual Expression::Properties properties() const;
87
88 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
89
90 /**
91 * Overridden to store a pointer to StaticContext::contextItemType().
92 */
93 virtual Expression::Ptr compress(const StaticContext::Ptr &context);
94
95 /**
96 * Overridden to store a pointer to StaticContext::contextItemType().
97 */
98 virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
99 const SequenceType::Ptr &reqType);
100
101 /**
102 * @returns always IDContextItem
103 */
104 virtual ID id() const;
105
106 /**
107 * @returns always BuiltinTypes::item;
108 */
109 virtual ItemType::Ptr expectedContextItemType() const;
110
111 virtual const SourceLocationReflection *actualReflection() const;
112 virtual void announceFocusType(const ItemType::Ptr &type);
113
114 private:
115 ItemType::Ptr m_itemType;
116 const Expression::Ptr m_expr;
117 };
118}
119
120QT_END_NAMESPACE
121
122#endif
123

source code of qtxmlpatterns/src/xmlpatterns/expr/qcontextitem_p.h