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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 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 qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qabstractfloat_p.h"
+#include "qboolean_p.h"
+#include "qbuiltintypes_p.h"
+#include "qcommonsequencetypes_p.h"
+#include "qemptysequence_p.h"
+#include "qfirstitempredicate_p.h"
+#include "qgenericsequencetype_p.h"
+#include "qitemmappingiterator_p.h"
+#include "qliteral_p.h"
+#include "qpatternistlocale_p.h"
+#include "qtruthpredicate_p.h"
+
+#include "qgenericpredicate_p.h"
+
+QT_BEGIN_NAMESPACE
+
+using namespace QPatternist;
+
+GenericPredicate::GenericPredicate(const Expression::Ptr &sourceExpression,
+ const Expression::Ptr &predicate) : PairContainer(sourceExpression,
+ predicate)
+{
+}
+
+Expression::Ptr GenericPredicate::create(const Expression::Ptr &sourceExpression,
+ const Expression::Ptr &predicateExpression,
+ const StaticContext::Ptr &context,
+ const QSourceLocation &location)
+{
+ Q_ASSERT(sourceExpression);
+ Q_ASSERT(predicateExpression);
+ Q_ASSERT(context);
+ const ItemType::Ptr type(predicateExpression->staticType()->itemType());
+
+ if(predicateExpression->is(IDIntegerValue) &&
+ predicateExpression->as<Literal>()->item().as<Numeric>()->toInteger() == 1)
+ { /* Handle [1] */
+ return createFirstItem(sourceExpression);
+ }
+ else if(BuiltinTypes::numeric->xdtTypeMatches(type))
+ { /* A numeric predicate, other than [1]. */
+ /* TODO at somepoint we'll return a specialized expr here, NumericPredicate or so.
+ * Dependency analysis is a bit tricky, since the contained expression can depend on
+ * some loop component. */
+ return Expression::Ptr(new GenericPredicate(sourceExpression, predicateExpression));
+ }
+ else if(*CommonSequenceTypes::Empty == *type)
+ {
+ return EmptySequence::create(predicateExpression.data(), context);
+ }
+ else if(*BuiltinTypes::item == *type ||
+ *BuiltinTypes::xsAnyAtomicType == *type)
+ {
+ /* The type couldn't be narrowed at compile time, so we use
+ * a generic predicate. This check is before the CommonSequenceTypes::EBV check,
+ * because the latter matches these types as well. */
+ return Expression::Ptr(new GenericPredicate(sourceExpression, predicateExpression));
+ }
+ else if(CommonSequenceTypes::EBV->itemType()->xdtTypeMatches(type))
+ {
+ return Expression::Ptr(new TruthPredicate(sourceExpression, predicateExpression));
+ }
+ else
+ {
+ context->error(QtXmlPatterns::tr("A value of type %1 cannot be a "
+ "predicate. A predicate must have "
+ "either a numeric type or an "
+ "Effective Boolean Value type.")
+ .arg(formatType(context->namePool(),
+ sourceExpression->staticType())),
+ ReportContext::FORG0006, location);
+ return Expression::Ptr(); /* Silence compiler warning. */
+ }
+}
+
+Expression::Ptr GenericPredicate::createFirstItem(const Expression::Ptr &sourceExpression)
+
+{
+ return Expression::Ptr(new FirstItemPredicate(sourceExpression));
+}
+
+Item GenericPredicate::mapToItem(const Item &item,
+ const DynamicContext::Ptr &context) const
+{
+ const Item::Iterator::Ptr it(m_operand2->evaluateSequence(context));
+ const Item pcateItem(it->next());
+
+ if(!pcateItem)
+ return Item(); /* The predicate evaluated to the empty sequence */
+ else if(pcateItem.isNode())
+ return item;
+ /* Ok, now it must be an AtomicValue */
+ else if(BuiltinTypes::numeric->xdtTypeMatches(pcateItem.type()))
+ { /* It's a positional predicate. */
+ if(it->next())
+ {
+ context->error(QtXmlPatterns::tr("A positional predicate must "
+ "evaluate to a single numeric "
+ "value."),
+ ReportContext::FORG0006, this);
+ return Item();
+ }
+
+ if(Double::isEqual(static_cast<xsDouble>(context->contextPosition()),
+ pcateItem.as<Numeric>()->toDouble()))
+ {
+ return item;
+ }
+ else
+ return Item();
+ }
+ else if(Boolean::evaluateEBV(pcateItem, it, context)) /* It's a truth predicate. */
+ return item;
+ else
+ return Item();
+}
+
+Item::Iterator::Ptr GenericPredicate::evaluateSequence(const DynamicContext::Ptr &context) const
+{
+ const Item::Iterator::Ptr focus(m_operand1->evaluateSequence(context));
+ const DynamicContext::Ptr newContext(context->createFocus());
+ newContext->setFocusIterator(focus);
+
+ return makeItemMappingIterator<Item>(ConstPtr(this),
+ focus,
+ newContext);
+}
+
+Item GenericPredicate::evaluateSingleton(const DynamicContext::Ptr &context) const
+{
+ const Item::Iterator::Ptr focus(m_operand1->evaluateSequence(context));
+ const DynamicContext::Ptr newContext(context->createFocus());
+ newContext->setFocusIterator(focus);
+ return mapToItem(focus->next(), newContext);
+}
+
+SequenceType::List GenericPredicate::expectedOperandTypes() const
+{
+ SequenceType::List result;
+ result.append(CommonSequenceTypes::ZeroOrMoreItems);
+ result.append(CommonSequenceTypes::ZeroOrMoreItems);
+ return result;
+}
+
+SequenceType::Ptr GenericPredicate::staticType() const
+{
+ const SequenceType::Ptr type(m_operand1->staticType());
+ return makeGenericSequenceType(type->itemType(),
+ type->cardinality() | Cardinality::zeroOrOne());
+}
+
+ExpressionVisitorResult::Ptr GenericPredicate::accept(const ExpressionVisitor::Ptr &visitor) const
+{
+ return visitor->visit(this);
+}
+
+ItemType::Ptr GenericPredicate::newFocusType() const
+{
+ return m_operand1->staticType()->itemType();
+}
+
+Expression::Properties GenericPredicate::properties() const
+{
+ return CreatesFocusForLast;
+}
+
+QString GenericPredicate::description() const
+{
+ return QLatin1String("predicate");
+}
+
+Expression::ID GenericPredicate::id() const
+{
+ return IDGenericPredicate;
+}
+
+QT_END_NAMESPACE
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