--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/xmlpatterns/janitors/qcardinalityverifier.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,224 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtXmlPatterns module 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qcommonsequencetypes_p.h"
+#include "qcommonvalues_p.h"
+#include "qgenericpredicate_p.h"
+#include "qgenericsequencetype_p.h"
+#include "qinsertioniterator_p.h"
+#include "qpatternistlocale_p.h"
+
+#include "qcardinalityverifier_p.h"
+
+QT_BEGIN_NAMESPACE
+
+using namespace QPatternist;
+
+QString CardinalityVerifier::wrongCardinality(const Cardinality &req,
+ const Cardinality &got)
+{
+ return QtXmlPatterns::tr("Required cardinality is %1; got cardinality %2.")
+ .arg(formatType(req), formatType(got));
+}
+
+Expression::Ptr CardinalityVerifier::verifyCardinality(const Expression::Ptr &operand,
+ const Cardinality &requiredCard,
+ const StaticContext::Ptr &context,
+ const ReportContext::ErrorCode code)
+{
+ const Cardinality opCard(operand->staticType()->cardinality());
+
+ if(requiredCard.isMatch(opCard))
+ return operand;
+ else if(requiredCard.canMatch(opCard))
+ return Expression::Ptr(new CardinalityVerifier(operand, requiredCard, code));
+ else if(context->compatModeEnabled() &&
+ !opCard.isEmpty())
+ {
+ return GenericPredicate::createFirstItem(operand);
+ }
+ else
+ {
+ /* Sequences within this cardinality can never match. */
+ context->error(wrongCardinality(requiredCard, opCard), code, operand.data());
+ return operand;
+ }
+}
+
+CardinalityVerifier::CardinalityVerifier(const Expression::Ptr &operand,
+ const Cardinality &card,
+ const ReportContext::ErrorCode code)
+ : SingleContainer(operand),
+ m_reqCard(card),
+ m_allowsMany(operand->staticType()->cardinality().allowsMany()),
+ m_errorCode(code)
+{
+ Q_ASSERT_X(m_reqCard != Cardinality::zeroOrMore(), Q_FUNC_INFO,
+ "It makes no sense to use CardinalityVerifier for cardinality zero-or-more.");
+}
+
+Item::Iterator::Ptr CardinalityVerifier::evaluateSequence(const DynamicContext::Ptr &context) const
+{
+ const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
+ const Item next(it->next());
+
+ if(next)
+ {
+ const Item next2(it->next());
+
+ if(next2)
+ {
+ if(m_reqCard.allowsMany())
+ {
+ Item::List start;
+ start.append(next);
+ start.append(next2);
+
+ return Item::Iterator::Ptr(new InsertionIterator(it, 1, makeListIterator(start)));
+ }
+ else
+ {
+ context->error(wrongCardinality(m_reqCard, Cardinality::twoOrMore()), m_errorCode, this);
+ return CommonValues::emptyIterator;
+ }
+ }
+ else
+ {
+ /* We might be instantiated for the empty sequence. */
+ if(m_reqCard.isEmpty())
+ {
+ context->error(wrongCardinality(m_reqCard, Cardinality::twoOrMore()), m_errorCode, this);
+ return CommonValues::emptyIterator;
+ }
+ else
+ return makeSingletonIterator(next);
+ }
+ }
+ else
+ {
+ if(m_reqCard.allowsEmpty())
+ return CommonValues::emptyIterator;
+ else
+ {
+ context->error(wrongCardinality(m_reqCard, Cardinality::twoOrMore()), m_errorCode, this);
+ return CommonValues::emptyIterator;
+ }
+ }
+}
+
+Item CardinalityVerifier::evaluateSingleton(const DynamicContext::Ptr &context) const
+{
+ if(m_allowsMany)
+ {
+ const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));
+ const Item item(it->next());
+
+ if(item)
+ {
+ if(it->next())
+ {
+ context->error(wrongCardinality(m_reqCard, Cardinality::twoOrMore()),
+ m_errorCode, this);
+ return Item();
+ }
+ else
+ return item;
+ }
+ else if(m_reqCard.allowsEmpty())
+ return Item();
+ else
+ {
+ context->error(wrongCardinality(m_reqCard), m_errorCode, this);
+ return Item();
+ }
+ }
+ else
+ {
+ const Item item(m_operand->evaluateSingleton(context));
+
+ if(item)
+ return item;
+ else if(m_reqCard.allowsEmpty())
+ return Item();
+ else
+ {
+ context->error(wrongCardinality(m_reqCard), m_errorCode, this);
+ return Item();
+ }
+ }
+}
+
+const SourceLocationReflection *CardinalityVerifier::actualReflection() const
+{
+ return m_operand->actualReflection();
+}
+
+Expression::Ptr CardinalityVerifier::compress(const StaticContext::Ptr &context)
+{
+ if(m_reqCard.isMatch(m_operand->staticType()->cardinality()))
+ return m_operand->compress(context);
+ else
+ return SingleContainer::compress(context);
+}
+
+SequenceType::List CardinalityVerifier::expectedOperandTypes() const
+{
+ SequenceType::List result;
+ result.append(CommonSequenceTypes::ZeroOrMoreItems);
+ return result;
+}
+
+SequenceType::Ptr CardinalityVerifier::staticType() const
+{
+ return makeGenericSequenceType(m_operand->staticType()->itemType(), m_reqCard);
+}
+
+ExpressionVisitorResult::Ptr CardinalityVerifier::accept(const ExpressionVisitor::Ptr &visitor) const
+{
+ return visitor->visit(this);
+}
+
+Expression::ID CardinalityVerifier::id() const
+{
+ return IDCardinalityVerifier;
+}
+
+QT_END_NAMESPACE