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Diffstat (limited to 'src/xmlpatterns/schema/qxsdstatemachine_p.h')
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1 files changed, 245 insertions, 0 deletions
diff --git a/src/xmlpatterns/schema/qxsdstatemachine_p.h b/src/xmlpatterns/schema/qxsdstatemachine_p.h new file mode 100644 index 0000000..68bc801 --- /dev/null +++ b/src/xmlpatterns/schema/qxsdstatemachine_p.h @@ -0,0 +1,245 @@ +/**************************************************************************** +** +** 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://www.qtsoftware.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 |