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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 224 insertions, 0 deletions

diff --git a/src/xmlpatterns/janitors/qcardinalityverifier.cpp b/src/xmlpatterns/janitors/qcardinalityverifier.cpp
new file mode 100644
index 0000000..7b56dbb
--- /dev/null
+++ b/src/xmlpatterns/janitors/qcardinalityverifier.cpp
@@ -0,0 +1,224 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 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