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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** 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 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 http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcommonsequencetypes_p.h"
#include "qoptimizerblocks_p.h"
#include "qoptimizationpasses_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
OptimizationPass::List OptimizationPasses::comparisonPasses;
OptimizationPass::List OptimizationPasses::forPasses;
OptimizationPass::List OptimizationPasses::ifThenPasses;
OptimizationPass::List OptimizationPasses::notFN;
void OptimizationPasses::Coordinator::init()
{
static bool isInitialized = false; // STATIC DATA
if(isInitialized)
return;
isInitialized = true;
/* Note, below is many of the building blocks re-used in several passes
* in order to reduce memory use. Thus, when changing one building block
* it potentially affects many passes. */
/* ****************************************************** */
/* Rewrite "count(<expr>) ge 1" into "exists(<expr>)" */
OptimizationPass::ExpressionMarker firstFirstChild;
firstFirstChild.append(0);
firstFirstChild.append(0);
ExpressionIdentifier::List geOpIDs;
const ExpressionIdentifier::Ptr countFN(new ByIDIdentifier(Expression::IDCountFN));
geOpIDs.append(countFN);
geOpIDs.append(ExpressionIdentifier::Ptr(new IntegerIdentifier(1)));
QVector<Expression::ID> geMatcher;
geMatcher.append(Expression::IDValueComparison);
geMatcher.append(Expression::IDGeneralComparison);
const ExpressionIdentifier::Ptr ge(new ComparisonIdentifier(geMatcher,
AtomicComparator::OperatorGreaterOrEqual));
const ExpressionCreator::Ptr existsFN(new ByIDCreator(Expression::IDExistsFN));
const OptimizationPass::Ptr geToExists(new OptimizationPass(ge, geOpIDs, firstFirstChild, existsFN));
comparisonPasses.append(geToExists);
/* ****************************************************** */
/* ****************************************************** */
/* Rewrite "count(<expr>) gt 0" into "exists(<expr>)" */
ExpressionIdentifier::List countAndIntZero;
countAndIntZero.append(countFN);
const ExpressionIdentifier::Ptr zeroInteger(new IntegerIdentifier(0));
countAndIntZero.append(zeroInteger);
const ExpressionIdentifier::Ptr gt(new ComparisonIdentifier(geMatcher,
AtomicComparator::OperatorGreaterThan));
const OptimizationPass::Ptr gtToExists(new OptimizationPass(gt, countAndIntZero,
firstFirstChild, existsFN));
comparisonPasses.append(gtToExists);
/* ****************************************************** */
/* ****************************************************** */
/* Rewrite "count(<expr>) ne 0" into "exists(<expr>)" */
const ExpressionIdentifier::Ptr ne(new ComparisonIdentifier(geMatcher,
AtomicComparator::OperatorNotEqual));
const OptimizationPass::Ptr neToExists(new OptimizationPass(ne, countAndIntZero, firstFirstChild,
existsFN,
OptimizationPass::AnyOrder));
comparisonPasses.append(neToExists);
/* ****************************************************** */
/* ****************************************************** */
/* Rewrite "count(<expr>) eq 0" into "empty(<expr>)" */
ExpressionIdentifier::List eqOpIDs;
eqOpIDs.append(countFN);
eqOpIDs.append(zeroInteger);
const ExpressionCreator::Ptr emptyFN(new ByIDCreator(Expression::IDEmptyFN));
const ExpressionIdentifier::Ptr eq(new ComparisonIdentifier(geMatcher,
AtomicComparator::OperatorEqual));
const OptimizationPass::Ptr eqToEmpty(new OptimizationPass(eq, eqOpIDs, firstFirstChild,
emptyFN,
OptimizationPass::AnyOrder));
comparisonPasses.append(eqToEmpty);
/* ****************************************************** */
/* ****************************************************** */
/* Rewrite "for $var in <expr> return $var" into "<expr>" */
ExpressionIdentifier::List forOps;
OptimizationPass::ExpressionMarker firstChild;
firstChild.append(0);
forOps.append(ExpressionIdentifier::Ptr());
forOps.append(ExpressionIdentifier::Ptr(new ByIDIdentifier(Expression::IDRangeVariableReference)));
const OptimizationPass::Ptr simplifyFor(new OptimizationPass(ExpressionIdentifier::Ptr(), forOps,
firstChild, ExpressionCreator::Ptr()));
forPasses.append(simplifyFor);
/* ****************************************************** */
/* ****************************************************** */
/* Rewrite "if(<expr>) then true() else false()" to "<expr>" */
OptimizationPass::ExpressionMarker marker;
marker.append(0);
ExpressionIdentifier::List opIDs;
opIDs.append(ExpressionIdentifier::Ptr(new BySequenceTypeIdentifier(
CommonSequenceTypes::ExactlyOneBoolean)));
opIDs.append(ExpressionIdentifier::Ptr(new BooleanIdentifier(true)));
opIDs.append(ExpressionIdentifier::Ptr(new BooleanIdentifier(false)));
const OptimizationPass::Ptr pass(new OptimizationPass(ExpressionIdentifier::Ptr(), opIDs, marker));
ifThenPasses.append(pass);
/* ****************************************************** */
/* ****************************************************** */
/* Rewrite "not(exists(X))" into "empty(X)" */
ExpressionIdentifier::List idExistsFN;
idExistsFN.append(ExpressionIdentifier::Ptr(new ByIDIdentifier(Expression::IDExistsFN)));
notFN.append(OptimizationPass::Ptr(new OptimizationPass(ExpressionIdentifier::Ptr(),
idExistsFN,
firstFirstChild,
emptyFN)));
/* Rewrite "not(empty(X))" into "exists(X)" */
ExpressionIdentifier::List idEmptyFN;
idEmptyFN.append(ExpressionIdentifier::Ptr(new ByIDIdentifier(Expression::IDEmptyFN)));
notFN.append(OptimizationPass::Ptr(new OptimizationPass(ExpressionIdentifier::Ptr(),
idEmptyFN,
firstFirstChild,
existsFN)));
/* ****************************************************** */
}
QT_END_NAMESPACE
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