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Diffstat (limited to 'src/xmlpatterns/expr/qifthenclause.cpp')
| -rw-r--r-- | src/xmlpatterns/expr/qifthenclause.cpp | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/xmlpatterns/expr/qifthenclause.cpp b/src/xmlpatterns/expr/qifthenclause.cpp new file mode 100644 index 0000000..cd9cbc3 --- /dev/null +++ b/src/xmlpatterns/expr/qifthenclause.cpp @@ -0,0 +1,152 @@ +/**************************************************************************** +** +** 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 "qgenericsequencetype_p.h" +#include "qoptimizationpasses_p.h" + +#include "qifthenclause_p.h" + +QT_BEGIN_NAMESPACE + +using namespace QPatternist; + +IfThenClause::IfThenClause(const Expression::Ptr &test, + const Expression::Ptr &then, + const Expression::Ptr &el) : TripleContainer(test, then, el) +{ +} + +Item::Iterator::Ptr IfThenClause::evaluateSequence(const DynamicContext::Ptr &context) const +{ + return m_operand1->evaluateEBV(context) + ? m_operand2->evaluateSequence(context) + : m_operand3->evaluateSequence(context); +} + +Item IfThenClause::evaluateSingleton(const DynamicContext::Ptr &context) const +{ + return m_operand1->evaluateEBV(context) + ? m_operand2->evaluateSingleton(context) + : m_operand3->evaluateSingleton(context); +} + +bool IfThenClause::evaluateEBV(const DynamicContext::Ptr &context) const +{ + return m_operand1->evaluateEBV(context) + ? m_operand2->evaluateEBV(context) + : m_operand3->evaluateEBV(context); +} + +void IfThenClause::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const +{ + if(m_operand1->evaluateEBV(context)) + m_operand2->evaluateToSequenceReceiver(context); + else + m_operand3->evaluateToSequenceReceiver(context); +} + +Expression::Ptr IfThenClause::compress(const StaticContext::Ptr &context) +{ + const Expression::Ptr me(TripleContainer::compress(context)); + + if(me != this) + return me; + + /* All operands mustn't be evaluated in order for const folding to + * be possible. Let's see how far we get. */ + + if(m_operand1->isEvaluated()) + { + if(m_operand1->evaluateEBV(context->dynamicContext())) + return m_operand2; + else + return m_operand3; + } + else + return me; +} + +QList<QExplicitlySharedDataPointer<OptimizationPass> > IfThenClause::optimizationPasses() const +{ + return OptimizationPasses::ifThenPasses; +} + +SequenceType::List IfThenClause::expectedOperandTypes() const +{ + SequenceType::List result; + result.append(CommonSequenceTypes::EBV); + result.append(CommonSequenceTypes::ZeroOrMoreItems); + result.append(CommonSequenceTypes::ZeroOrMoreItems); + return result; +} + +SequenceType::Ptr IfThenClause::staticType() const +{ + const SequenceType::Ptr t1(m_operand2->staticType()); + const SequenceType::Ptr t2(m_operand3->staticType()); + + return makeGenericSequenceType(t1->itemType() | t2->itemType(), + t1->cardinality() | t2->cardinality()); +} + +ExpressionVisitorResult::Ptr IfThenClause::accept(const ExpressionVisitor::Ptr &visitor) const +{ + return visitor->visit(this); +} + +Expression::ID IfThenClause::id() const +{ + return IDIfThenClause; +} + +/* +Expression::Properties IfThenClause::properties() const +{ + return m_operand1->properties() + | m_operand2->properties() + | m_operand3->properties() + & ( Expression::RequiresFocus + | Expression::IsEvaluated + | Expression::DisableElimination); +} +*/ +QT_END_NAMESPACE |