1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
/****************************************************************************
**
** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
#ifndef Patternist_XsdStateMachine_H
#define Patternist_XsdStateMachine_H
#include "qnamepool_p.h"
#include <QtCore/QHash>
#include <QtCore/QSet>
#include <QtCore/QTextStream>
class QIODevice;
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short A state machine used for evaluation.
*
* @ingroup Patternist_schema
* @author Tobias Koenig <tobias.koenig@trolltech.com>
*/
template <typename TransitionType>
class XsdStateMachine
{
public:
typedef qint32 StateId;
/**
* Describes the type of state.
*/
enum StateType
{
StartState, ///< The state the machine will start with.
StartEndState, ///< The state the machine will start with, can be end state as well.
InternalState, ///< Any state that is not start or end state.
EndState ///< Any state where the machine is allowed to stop.
};
/**
* Creates a new state machine object.
*/
XsdStateMachine();
/**
* Creates a new state machine object.
*
* The name pool to use for accessing object names.
*/
XsdStateMachine(const NamePool::Ptr &namePool);
/**
* Adds a new state of the given @p type to the state machine.
*
* @return The id of the new state.
*/
StateId addState(StateType type);
/**
* Adds a new @p transition to the state machine.
*
* @param start The start state.
* @param transition The transition to come from the start to the end state.
* @param end The end state.
*/
void addTransition(StateId start, TransitionType transition, StateId end);
/**
* Adds a new epsilon @p transition to the state machine.
*
* @param start The start state.
* @param end The end state.
*/
void addEpsilonTransition(StateId start, StateId end);
/**
* Resets the machine to the start state.
*/
void reset();
/**
* Removes all states and transitions from the state machine.
*/
void clear();
/**
* Continues execution of the machine with the given input @p transition.
*
* @return @c true if the transition was successfull, @c false otherwise.
*/
bool proceed(TransitionType transition);
/**
* Returns the list of transitions that are reachable from the current
* state.
*/
QList<TransitionType> possibleTransitions() const;
/**
* Continues execution of the machine with the given @p input.
*
* @note To use this method, inputEqualsTransition must be implemented
* to find the right transition to use.
*
* @return @c true if the transition was successfull, @c false otherwise.
*/
template <typename InputType>
bool proceed(InputType input);
/**
* Returns whether the given @p input matches the given @p transition.
*/
template <typename InputType>
bool inputEqualsTransition(InputType input, TransitionType transition) const;
/**
* Returns whether the machine is in an allowed end state.
*/
bool inEndState() const;
/**
* Returns the last transition that was taken.
*/
TransitionType lastTransition() const;
/**
* Returns the start state of the machine.
*/
StateId startState() const;
/**
* This method should be redefined by template specialization for every
* concret TransitionType.
*/
QString transitionTypeToString(TransitionType type) const;
/**
* Outputs the state machine in DOT format to the given
* output @p device.
*/
bool outputGraph(QIODevice *device, const QString &graphName) const;
/**
* Returns a DFA that is equal to the NFA of the state machine.
*/
XsdStateMachine<TransitionType> toDFA() const;
/**
* Returns the information of all states of the state machine.
*/
QHash<StateId, StateType> states() const;
/**
* Returns the information of all transitions of the state machine.
*/
QHash<StateId, QHash<TransitionType, QVector<StateId> > > transitions() const;
private:
/**
* Returns the DFA state for the given @p nfaStat from the given @p stateTable.
* If there is no corresponding DFA state yet, a new one is created.
*/
StateId dfaStateForNfaState(QSet<StateId> nfaState, QList< QPair< QSet<StateId>, StateId> > &stateTable, XsdStateMachine<TransitionType> &dfa) const;
/**
* Returns the set of all states that can be reached from the set of @p input states
* by the epsilon transition.
*/
QSet<StateId> epsilonClosure(const QSet<StateId> &input) const;
/**
* Returns the set of all states that can be reached from the set of given @p states
* by the given @p input.
*/
QSet<StateId> move(const QSet<StateId> &states, TransitionType input) const;
NamePool::Ptr m_namePool;
QHash<StateId, StateType> m_states;
QHash<StateId, QHash<TransitionType, QVector<StateId> > > m_transitions;
QHash<StateId, QVector<StateId> > m_epsilonTransitions;
StateId m_currentState;
qint32 m_counter;
TransitionType m_lastTransition;
};
#include "qxsdstatemachine.cpp"
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
|
