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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 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, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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
|
