| 1 | /****************************************************************************
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| 2 | **
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| 3 | ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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| 4 | ** Contact: Qt Software Information (qt-info@nokia.com)
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| 5 | **
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| 6 | ** This file is part of the QtXmlPatterns module of the Qt Toolkit.
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| 7 | **
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| 8 | ** $QT_BEGIN_LICENSE:LGPL$
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| 9 | ** Commercial Usage
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| 10 | ** Licensees holding valid Qt Commercial licenses may use this file in
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| 11 | ** accordance with the Qt Commercial License Agreement provided with the
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| 12 | ** Software or, alternatively, in accordance with the terms contained in
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| 13 | ** a written agreement between you and Nokia.
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| 14 | **
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| 15 | ** GNU Lesser General Public License Usage
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| 16 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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| 17 | ** General Public License version 2.1 as published by the Free Software
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| 18 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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| 19 | ** packaging of this file. Please review the following information to
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| 20 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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| 21 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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| 22 | **
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| 23 | ** In addition, as a special exception, Nokia gives you certain
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| 24 | ** additional rights. These rights are described in the Nokia Qt LGPL
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| 25 | ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
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| 26 | ** package.
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| 27 | **
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| 28 | ** GNU General Public License Usage
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| 29 | ** Alternatively, this file may be used under the terms of the GNU
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| 30 | ** General Public License version 3.0 as published by the Free Software
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| 31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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| 32 | ** packaging of this file. Please review the following information to
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| 33 | ** ensure the GNU General Public License version 3.0 requirements will be
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| 34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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| 35 | **
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| 36 | ** If you are unsure which license is appropriate for your use, please
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| 37 | ** contact the sales department at qt-sales@nokia.com.
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| 38 | ** $QT_END_LICENSE$
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| 39 | **
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| 40 | ****************************************************************************/
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| 41 |
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| 42 | #include <QVariant>
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| 43 | #include <QStringList>
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| 44 |
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| 45 | #include "qanyuri_p.h"
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| 46 | #include "qatomicstring_p.h"
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| 47 | #include "qbuiltintypes_p.h"
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| 48 | #include "qcommonsequencetypes_p.h"
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| 49 | #include "qgenericsequencetype_p.h"
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| 50 | #include "qinteger_p.h"
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| 51 | #include "qitem_p.h"
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| 52 | #include "qsequencetype_p.h"
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| 53 | #include "qvariableloader_p.h"
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| 54 | #include "qxmlquery_p.h"
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| 55 |
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| 56 | QT_BEGIN_NAMESPACE
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| 57 |
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| 58 | namespace QPatternist
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| 59 | {
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| 60 |
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| 61 | class VariantListIterator : public ListIteratorPlatform<QVariant, Item, VariantListIterator>
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| 62 | {
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| 63 | public:
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| 64 | inline VariantListIterator(const QVariantList &list) : ListIteratorPlatform<QVariant, Item, VariantListIterator>(list)
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| 65 | {
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| 66 | }
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| 67 |
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| 68 | private:
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| 69 | friend class ListIteratorPlatform<QVariant, Item, VariantListIterator>;
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| 70 |
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| 71 | inline Item inputToOutputItem(const QVariant &inputType) const
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| 72 | {
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| 73 | return AtomicValue::toXDM(inputType);
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| 74 | }
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| 75 | };
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| 76 |
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| 77 | class StringListIterator : public ListIteratorPlatform<QString, Item, StringListIterator>
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| 78 | {
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| 79 | public:
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| 80 | inline StringListIterator(const QStringList &list) : ListIteratorPlatform<QString, Item, StringListIterator>(list)
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| 81 | {
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| 82 | }
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| 83 |
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| 84 | private:
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| 85 | friend class ListIteratorPlatform<QString, Item, StringListIterator>;
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| 86 |
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| 87 | static inline Item inputToOutputItem(const QString &inputType)
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| 88 | {
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| 89 | return AtomicString::fromValue(inputType);
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| 90 | }
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| 91 | };
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| 92 |
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| 93 | /**
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| 94 | * Takes two DynamicContext instances, and redirects the storage of temporary trees
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| 95 | * to one of them.
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| 96 | *
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| 97 | * @since 4.5
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| 98 | */
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| 99 | class TemporaryTreesRedirectingContext : public DelegatingDynamicContext
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| 100 | {
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| 101 | public:
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| 102 | TemporaryTreesRedirectingContext(const DynamicContext::Ptr &other,
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| 103 | const DynamicContext::Ptr &modelStorage) : DelegatingDynamicContext(other)
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| 104 | , m_modelStorage(modelStorage)
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| 105 | {
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| 106 | Q_ASSERT(m_modelStorage);
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| 107 | }
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| 108 |
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| 109 | virtual void addNodeModel(const QAbstractXmlNodeModel::Ptr &nodeModel)
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| 110 | {
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| 111 | m_modelStorage->addNodeModel(nodeModel);
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| 112 | }
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| 113 |
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| 114 | private:
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| 115 | const DynamicContext::Ptr m_modelStorage;
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| 116 | };
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| 117 | }
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| 118 |
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| 119 | using namespace QPatternist;
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| 120 |
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| 121 | SequenceType::Ptr VariableLoader::announceExternalVariable(const QXmlName name,
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| 122 | const SequenceType::Ptr &declaredType)
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| 123 | {
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| 124 | Q_UNUSED(declaredType);
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| 125 | const QVariant &variant = m_bindingHash.value(name);
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| 126 |
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| 127 |
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| 128 | if(variant.isNull())
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| 129 | return SequenceType::Ptr();
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| 130 | else if(variant.userType() == qMetaTypeId<QIODevice *>())
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| 131 | return CommonSequenceTypes::ExactlyOneAnyURI;
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| 132 | else if(variant.userType() == qMetaTypeId<QXmlQuery>())
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| 133 | {
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| 134 | const QXmlQuery variableQuery(qVariantValue<QXmlQuery>(variant));
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| 135 | return variableQuery.d->expression()->staticType();
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| 136 | }
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| 137 | else
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| 138 | {
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| 139 | return makeGenericSequenceType(AtomicValue::qtToXDMType(qVariantValue<QXmlItem>(variant)),
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| 140 | Cardinality::exactlyOne());
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| 141 | }
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| 142 | }
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| 143 |
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| 144 | Item::Iterator::Ptr VariableLoader::evaluateSequence(const QXmlName name,
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| 145 | const DynamicContext::Ptr &context)
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| 146 | {
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| 147 |
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| 148 | const QVariant &variant = m_bindingHash.value(name);
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| 149 | Q_ASSERT_X(!variant.isNull(), Q_FUNC_INFO,
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| 150 | "We assume that we have a binding.");
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| 151 |
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| 152 | /* Same code as in the default clause below. */
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| 153 | if(variant.userType() == qMetaTypeId<QIODevice *>())
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| 154 | return makeSingletonIterator(itemForName(name));
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| 155 | else if(variant.userType() == qMetaTypeId<QXmlQuery>())
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| 156 | {
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| 157 | const QXmlQuery variableQuery(qVariantValue<QXmlQuery>(variant));
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| 158 |
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| 159 | return variableQuery.d->expression()->evaluateSequence(DynamicContext::Ptr(new TemporaryTreesRedirectingContext(variableQuery.d->dynamicContext(), context)));
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| 160 | }
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| 161 |
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| 162 | const QVariant v(qVariantValue<QXmlItem>(variant).toAtomicValue());
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| 163 |
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| 164 | switch(v.type())
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| 165 | {
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| 166 | case QVariant::StringList:
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| 167 | return Item::Iterator::Ptr(new StringListIterator(v.toStringList()));
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| 168 | case QVariant::List:
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| 169 | return Item::Iterator::Ptr(new VariantListIterator(v.toList()));
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| 170 | default:
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| 171 | return makeSingletonIterator(itemForName(name));
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| 172 | }
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| 173 | }
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| 174 |
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| 175 | Item VariableLoader::itemForName(const QXmlName &name) const
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| 176 | {
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| 177 | const QVariant &variant = m_bindingHash.value(name);
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| 178 |
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| 179 | if(variant.userType() == qMetaTypeId<QIODevice *>())
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| 180 | return Item(AnyURI::fromValue(QLatin1String("tag:trolltech.com,2007:QtXmlPatterns:QIODeviceVariable:") + m_namePool->stringForLocalName(name.localName())));
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| 181 |
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| 182 | const QXmlItem item(qVariantValue<QXmlItem>(variant));
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| 183 |
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| 184 | if(item.isNode())
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| 185 | return Item::fromPublic(item);
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| 186 | else
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| 187 | {
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| 188 | const QVariant atomicValue(item.toAtomicValue());
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| 189 | /* If the atomicValue is null it means it doesn't exist in m_bindingHash, and therefore it must
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| 190 | * be a QIODevice, since Patternist guarantees to only ask for variables that announceExternalVariable()
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| 191 | * has accepted. */
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| 192 | if(atomicValue.isNull())
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| 193 | return Item(AnyURI::fromValue(QLatin1String("tag:trolltech.com,2007:QtXmlPatterns:QIODeviceVariable:") + m_namePool->stringForLocalName(name.localName())));
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| 194 | else
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| 195 | return AtomicValue::toXDM(atomicValue);
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| 196 | }
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| 197 | }
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| 198 |
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| 199 | Item VariableLoader::evaluateSingleton(const QXmlName name,
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| 200 | const DynamicContext::Ptr &)
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| 201 | {
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| 202 | return itemForName(name);
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| 203 | }
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| 204 |
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| 205 | bool VariableLoader::isSameType(const QVariant &v1,
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| 206 | const QVariant &v2) const
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| 207 | {
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| 208 | /* Are both of type QIODevice *? */
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| 209 | if(v1.userType() == qMetaTypeId<QIODevice *>() && v1.userType() == v2.userType())
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| 210 | return true;
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| 211 |
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| 212 | /* Ok, we have two QXmlItems. */
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| 213 | const QXmlItem i1(qVariantValue<QXmlItem>(v1));
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| 214 | const QXmlItem i2(qVariantValue<QXmlItem>(v2));
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| 215 |
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| 216 | if(i1.isNode())
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| 217 | {
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| 218 | Q_ASSERT(false);
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| 219 | return false;
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| 220 | }
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| 221 | else if(i2.isAtomicValue())
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| 222 | return i1.toAtomicValue().type() == i2.toAtomicValue().type();
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| 223 | else
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| 224 | {
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| 225 | /* One is an atomic, the other is a node or they are null. */
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| 226 | return false;
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| 227 | }
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| 228 | }
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| 229 |
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| 230 | void VariableLoader::removeBinding(const QXmlName &name)
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| 231 | {
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| 232 | m_bindingHash.remove(name);
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| 233 | }
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| 234 |
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| 235 | bool VariableLoader::hasBinding(const QXmlName &name) const
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| 236 | {
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| 237 | return m_bindingHash.contains(name)
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| 238 | || (m_previousLoader && m_previousLoader->hasBinding(name));
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| 239 | }
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| 240 |
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| 241 | QVariant VariableLoader::valueFor(const QXmlName &name) const
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| 242 | {
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| 243 | if(m_bindingHash.contains(name))
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| 244 | return m_bindingHash.value(name);
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| 245 | else if(m_previousLoader)
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| 246 | return m_previousLoader->valueFor(name);
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| 247 | else
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| 248 | return QVariant();
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| 249 | }
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| 250 |
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| 251 | void VariableLoader::addBinding(const QXmlName &name,
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| 252 | const QVariant &value)
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| 253 | {
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| 254 | m_bindingHash.insert(name, value);
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| 255 | }
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| 256 |
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| 257 | bool VariableLoader::invalidationRequired(const QXmlName &name,
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| 258 | const QVariant &variant) const
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| 259 | {
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| 260 | return hasBinding(name) && !isSameType(valueFor(name), variant);
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| 261 | }
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| 262 |
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| 263 | QT_END_NAMESPACE
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| 264 |
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