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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_NodeFNs_H
51#define Patternist_NodeFNs_H
52
53#include <private/qfunctioncall_p.h>
54#include <private/qcastingplatform_p.h>
55
56/**
57 * @file
58 * @short Contains classes implementing the functions found in
59 * <a href="http://www.w3.org/TR/xpath-functions/#node-functions">XQuery 1.0 and
60 * XPath 2.0 Functions and Operators, 14 Functions and Operators on Nodes</a>.
61 *
62 * @ingroup Patternist_functions
63 */
64
65QT_BEGIN_NAMESPACE
66
67namespace QPatternist
68{
69 /**
70 * @short Implements the function <tt>fn:name()</tt>.
71 *
72 * @ingroup Patternist_functions
73 * @author Frans Englich <frans.englich@nokia.com>
74 */
75 class NameFN : public FunctionCall
76 {
77 public:
78 virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
79 };
80
81 /**
82 * @short Implements the function <tt>fn:local-name()</tt>.
83 *
84 * @ingroup Patternist_functions
85 * @author Frans Englich <frans.englich@nokia.com>
86 */
87 class LocalNameFN : public FunctionCall
88 {
89 public:
90 virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
91 };
92
93 /**
94 * @short Implements the function <tt>fn:namespace-uri()</tt>.
95 *
96 * @ingroup Patternist_functions
97 * @author Frans Englich <frans.englich@nokia.com>
98 */
99 class NamespaceURIFN : public FunctionCall
100 {
101 public:
102 virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
103 };
104
105 /**
106 * @short Implements the function <tt>fn:number()</tt>.
107 *
108 * NumberFN uses CastingPlatform for performing the actual casting.
109 *
110 * @ingroup Patternist_functions
111 * @author Frans Englich <frans.englich@nokia.com>
112 */
113 class NumberFN : public FunctionCall,
114 public CastingPlatform<NumberFN, false>
115 {
116 public:
117 virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
118
119 /**
120 * Overridden in order to call CastingPlatform::prepareCasting(). It also
121 * implements the optimization of rewriting to its operand if its
122 * type is xs:double(since the <tt>fn:number()</tt> call is in that case superflorous).
123 */
124 virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
125 const SequenceType::Ptr &reqType);
126
127 /**
128 * @returns always BuiltinTypes::xsDouble.
129 */
130 inline ItemType::Ptr targetType() const
131 {
132 return BuiltinTypes::xsDouble;
133 }
134 };
135
136 /**
137 * @short Implements the function <tt>fn:lang()</tt>.
138 *
139 * @ingroup Patternist_functions
140 * @author Frans Englich <frans.englich@nokia.com>
141 */
142 class LangFN : public FunctionCall
143 {
144 public:
145 virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
146
147 private:
148 static inline bool isLangMatch(const QString &candidate, const QString &toMatch);
149 };
150
151 /**
152 * @short Implements the function <tt>fn:root()</tt>.
153 *
154 * @ingroup Patternist_functions
155 * @author Frans Englich <frans.englich@nokia.com>
156 */
157 class RootFN : public FunctionCall
158 {
159 public:
160 virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
161 /**
162 * Infers its cardinality from the argument.
163 */
164 virtual SequenceType::Ptr staticType() const;
165 };
166}
167
168QT_END_NAMESPACE
169
170#endif
171

source code of qtxmlpatterns/src/xmlpatterns/functions/qnodefns_p.h