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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qxsdstatemachinebuilder_p.h"
#include "qxsdelement_p.h"
#include "qxsdmodelgroup_p.h"
#include "qxsdschemahelper_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
/*
* This methods takes a list of objects and returns a list of list
* of all combinations the objects can be ordered.
*
* e.g. input = [ 1, 2, 3 ]
* output = [
* [ 1, 2, 3 ],
* [ 1, 3, 2 ],
* [ 2, 1, 3 ],
* [ 2, 3, 1 ],
* [ 3, 1, 2 ],
* [ 3, 2, 1 ]
* ]
*
* The method is used to create all possible combinations for the particles
* in an <all> model group.
*/
template <typename T>
QList< QList<T> > allCombinations(const QList<T> &input)
{
if (input.count() == 1)
return (QList< QList<T> >() << input);
QList< QList<T> > result;
for (int i = 0; i < input.count(); ++i) {
QList<T> subList = input;
T value = subList.takeAt(i);
QList< QList<T> > subLists = allCombinations(subList);
for (int j = 0; j < subLists.count(); ++j) {
subLists[j].prepend(value);
}
result << subLists;
}
return result;
}
XsdStateMachineBuilder::XsdStateMachineBuilder(XsdStateMachine<XsdTerm::Ptr> *machine, const NamePool::Ptr &namePool, Mode mode)
: m_stateMachine(machine), m_namePool(namePool), m_mode(mode)
{
}
XsdStateMachine<XsdTerm::Ptr>::StateId XsdStateMachineBuilder::reset()
{
Q_ASSERT(m_stateMachine);
m_stateMachine->clear();
return m_stateMachine->addState(XsdStateMachine<XsdTerm::Ptr>::EndState);
}
XsdStateMachine<XsdTerm::Ptr>::StateId XsdStateMachineBuilder::addStartState(XsdStateMachine<XsdTerm::Ptr>::StateId state)
{
const XsdStateMachine<XsdTerm::Ptr>::StateId startState = m_stateMachine->addState(XsdStateMachine<XsdTerm::Ptr>::StartState);
m_stateMachine->addEpsilonTransition(startState, state);
return startState;
}
/*
* Create the FSA according to Algorithm Tp(S) from http://www.ltg.ed.ac.uk/~ht/XML_Europe_2003.html
*/
XsdStateMachine<XsdTerm::Ptr>::StateId XsdStateMachineBuilder::buildParticle(const XsdParticle::Ptr &particle, XsdStateMachine<XsdTerm::Ptr>::StateId endState)
{
XsdStateMachine<XsdTerm::Ptr>::StateId currentStartState = endState;
XsdStateMachine<XsdTerm::Ptr>::StateId currentEndState = endState;
// 2
if (particle->maximumOccursUnbounded()) {
const XsdStateMachine<XsdTerm::Ptr>::StateId t = m_stateMachine->addState(XsdStateMachine<XsdTerm::Ptr>::InternalState);
const XsdStateMachine<XsdTerm::Ptr>::StateId n = buildTerm(particle->term(), t);
m_stateMachine->addEpsilonTransition(t, n);
m_stateMachine->addEpsilonTransition(n, endState);
currentEndState = t;
currentStartState = t;
} else { // 3
int count = (particle->maximumOccurs() - particle->minimumOccurs());
if (count > 100)
count = 100;
for (int i = 0; i < count; ++i) {
currentStartState = buildTerm(particle->term(), currentEndState);
m_stateMachine->addEpsilonTransition(currentStartState, endState);
currentEndState = currentStartState;
}
}
int minOccurs = particle->minimumOccurs();
if (minOccurs > 100)
minOccurs = 100;
for (int i = 0; i < minOccurs; ++i) {
currentStartState = buildTerm(particle->term(), currentEndState);
currentEndState = currentStartState;
}
return currentStartState;
}
/*
* Create the FSA according to Algorithm Tt(S) from http://www.ltg.ed.ac.uk/~ht/XML_Europe_2003.html
*/
XsdStateMachine<XsdTerm::Ptr>::StateId XsdStateMachineBuilder::buildTerm(const XsdTerm::Ptr &term, XsdStateMachine<XsdTerm::Ptr>::StateId endState)
{
if (term->isWildcard()) { // 1
const XsdStateMachine<XsdTerm::Ptr>::StateId b = m_stateMachine->addState(XsdStateMachine<XsdTerm::Ptr>::InternalState);
m_stateMachine->addTransition(b, term, endState);
return b;
} else if (term->isElement()) { // 2
const XsdStateMachine<XsdTerm::Ptr>::StateId b = m_stateMachine->addState(XsdStateMachine<XsdTerm::Ptr>::InternalState);
m_stateMachine->addTransition(b, term, endState);
const XsdElement::Ptr element(term);
if (m_mode == CheckingMode) {
const XsdElement::List substGroups = element->substitutionGroups();
for (int i = 0; i < substGroups.count(); ++i)
m_stateMachine->addTransition(b, substGroups.at(i), endState);
} else if (m_mode == ValidatingMode) {
const XsdElement::List substGroups = element->substitutionGroups();
for (int i = 0; i < substGroups.count(); ++i) {
if (XsdSchemaHelper::substitutionGroupOkTransitive(element, substGroups.at(i), m_namePool))
m_stateMachine->addTransition(b, substGroups.at(i), endState);
}
}
return b;
} else if (term->isModelGroup()) {
const XsdModelGroup::Ptr group(term);
if (group->compositor() == XsdModelGroup::ChoiceCompositor) { // 3
const XsdStateMachine<XsdTerm::Ptr>::StateId b = m_stateMachine->addState(XsdStateMachine<XsdTerm::Ptr>::InternalState);
for (int i = 0; i < group->particles().count(); ++i) {
const XsdParticle::Ptr particle(group->particles().at(i));
if (particle->maximumOccurs() != 0) {
const XsdStateMachine<XsdTerm::Ptr>::StateId state = buildParticle(particle, endState);
m_stateMachine->addEpsilonTransition(b, state);
}
}
return b;
} else if (group->compositor() == XsdModelGroup::SequenceCompositor) { // 4
XsdStateMachine<XsdTerm::Ptr>::StateId currentStartState = endState;
XsdStateMachine<XsdTerm::Ptr>::StateId currentEndState = endState;
for (int i = (group->particles().count() - 1); i >= 0; --i) { // iterate reverse
const XsdParticle::Ptr particle(group->particles().at(i));
if (particle->maximumOccurs() != 0) {
currentStartState = buildParticle(particle, currentEndState);
currentEndState = currentStartState;
}
}
return currentStartState;
} else if (group->compositor() == XsdModelGroup::AllCompositor) {
const XsdStateMachine<XsdTerm::Ptr>::StateId newStartState = m_stateMachine->addState(XsdStateMachine<XsdTerm::Ptr>::InternalState);
const QList<XsdParticle::List> list = allCombinations(group->particles());
for (int i = 0; i < list.count(); ++i) {
XsdStateMachine<XsdTerm::Ptr>::StateId currentStartState = endState;
XsdStateMachine<XsdTerm::Ptr>::StateId currentEndState = endState;
const XsdParticle::List particles = list.at(i);
for (int j = (particles.count() - 1); j >= 0; --j) { // iterate reverse
const XsdParticle::Ptr particle(particles.at(j));
if (particle->maximumOccurs() != 0) {
currentStartState = buildParticle(particle, currentEndState);
currentEndState = currentStartState;
}
}
m_stateMachine->addEpsilonTransition(newStartState, currentStartState);
}
if (list.isEmpty())
return endState;
else
return newStartState;
}
}
Q_ASSERT(false);
return 0;
}
static void internalParticleLookupMap(const XsdParticle::Ptr &particle, QHash<XsdTerm::Ptr, XsdParticle::Ptr> &hash)
{
hash.insert(particle->term(), particle);
if (particle->term()->isModelGroup()) {
const XsdModelGroup::Ptr group(particle->term());
const XsdParticle::List particles = group->particles();
for (int i = 0; i < particles.count(); ++i)
internalParticleLookupMap(particles.at(i), hash);
}
}
QHash<XsdTerm::Ptr, XsdParticle::Ptr> XsdStateMachineBuilder::particleLookupMap(const XsdParticle::Ptr &particle)
{
QHash<XsdTerm::Ptr, XsdParticle::Ptr> result;
internalParticleLookupMap(particle, result);
return result;
}
QT_END_NAMESPACE
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