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6** This file is part of the QtXmlPatterns module of the Qt Toolkit.
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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_ProjectedExpression_H
51#define Patternist_ProjectedExpression_H
52
53#include <private/qitem_p.h>
54
55QT_BEGIN_NAMESPACE
56
57namespace QPatternist
58{
59 class ProjectedExpression
60 {
61 public:
62 typedef ProjectedExpression * Ptr;
63 typedef QVector<ProjectedExpression::Ptr> Vector;
64 virtual ~ProjectedExpression()
65 {
66 }
67
68 enum Action
69 {
70 Move = 0,
71 Skip = 1,
72 Keep = 2,
73 KeepSubtree = 4 | Keep
74 };
75
76 virtual Action actionForElement(const QXmlName name,
77 ProjectedExpression::Ptr &next) const
78 {
79 Q_UNUSED(name);
80 Q_UNUSED(next);
81 return Skip;
82 }
83
84 };
85
86 class ProjectedNodeTest
87 {
88 public:
89 typedef ProjectedNodeTest * Ptr;
90 virtual ~ProjectedNodeTest()
91 {
92 }
93
94 virtual bool isMatch(const QXmlNodeModelIndex::NodeKind kind) const
95 {
96 Q_UNUSED(kind);
97 return false;
98 }
99 };
100
101 class ProjectedStep : public ProjectedExpression
102 {
103 public:
104 ProjectedStep(const ProjectedNodeTest::Ptr test,
105 const QXmlNodeModelIndex::Axis axis)
106 {
107 Q_ASSERT(test);
108 Q_UNUSED(test);
109 Q_UNUSED(axis);
110 }
111
112 virtual Action actionForElement(const QXmlName name,
113 ProjectedExpression::Ptr &next) const
114 {
115 Q_UNUSED(name);
116 Q_UNUSED(next);
117 // TODO
118 return Skip;
119 }
120
121 private:
122 };
123
124 class ProjectedPath : public ProjectedExpression
125 {
126 public:
127 ProjectedPath(const ProjectedExpression::Ptr left,
128 const ProjectedExpression::Ptr right) : m_left(left)
129 {
130 Q_ASSERT(m_left);
131 Q_ASSERT(right);
132 Q_UNUSED(right);
133 }
134
135 virtual Action actionForElement(const QXmlName name,
136 ProjectedExpression::Ptr &next) const
137 {
138 ProjectedExpression::Ptr &candidateNext = next;
139 const Action a = m_left->actionForElement(name, next&: candidateNext);
140
141 if(a != Skip)
142 {
143 /* The test accepted it, so let's replace us with the new step. */
144 next = candidateNext;
145 }
146
147 return a;
148 }
149
150 private:
151 const ProjectedExpression::Ptr m_left;
152 };
153}
154
155QT_END_NAMESPACE
156
157#endif
158

source code of qtxmlpatterns/src/xmlpatterns/projection/qprojectedexpression_p.h