File indexing completed on 2024-04-14 03:58:28

 /*
     This file is part of the syndication library
     SPDX-FileCopyrightText: 2006 Frank Osterfeld <osterfeld@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "parser.h"
 #include "document.h"
 #include "model.h"
 #include "modelmaker.h"
 #include "property.h"
 #include "rdfvocab.h"
 #include "resource.h"
 #include "rssvocab.h"
 #include "statement.h"
 
 #include <documentsource.h>
 
 #include <QDomDocument>
 #include <QDomNodeList>
 #include <QHash>
 #include <QList>
 #include <QMap>
 #include <QString>
 #include <QStringList>
 
 namespace Syndication
 {
 namespace RDF
 {
 class SYNDICATION_NO_EXPORT Parser::ParserPrivate
 {
 public:
     QDomDocument addEnumeration(const QDomDocument &doc);
     void map09to10(Model model);
     void addSequenceFor09(Model model);
 
     QString strInternalNs;
     QString strItemIndex;
 };
 
 bool Parser::accept(const DocumentSource &source) const
 {
     QDomDocument doc = source.asDomDocument();
 
     if (doc.isNull()) {
         return false;
     }
     QDomElement root = doc.documentElement();
 
     if (!root.isElement()) {
         return false;
     }
 
     return root.namespaceURI() == RDFVocab::self()->namespaceURI();
 }
 
 SpecificDocumentPtr Parser::parse(const DocumentSource &source) const
 {
     QDomDocument doc = source.asDomDocument();
 
     if (doc.isNull()) {
         return Syndication::SpecificDocumentPtr(new Document());
     }
 
     doc = d->addEnumeration(doc);
 
     ModelMaker maker;
     Model model = maker.createFromXML(doc);
 
     bool is09 = !model.resourcesWithType(RSS09Vocab::self()->channel()).isEmpty();
 
     if (is09) {
         d->map09to10(model);
         d->addSequenceFor09(model);
     }
 
     QList<ResourcePtr> channels = model.resourcesWithType(RSSVocab::self()->channel());
 
     if (channels.isEmpty()) {
         return Syndication::SpecificDocumentPtr(new Document());
     }
 
     return DocumentPtr(new Document(*(channels.begin())));
 }
 
 QDomDocument Parser::ParserPrivate::addEnumeration(const QDomDocument &docp)
 {
     QDomDocument doc(docp);
 
     const QDomNodeList list = doc.elementsByTagNameNS(RSS09Vocab::self()->namespaceURI(), QStringLiteral("item"));
 
     for (int i = 0; i < list.size(); ++i) {
         QDomElement item = list.item(i).toElement();
         if (!item.isNull()) {
             QDomElement ie = doc.createElementNS(strInternalNs, strItemIndex);
             item.appendChild(ie);
             ie.appendChild(doc.createTextNode(QString::number(i)));
         }
     }
 
     return doc;
 }
 
 void Parser::ParserPrivate::map09to10(Model model)
 {
     QHash<QString, PropertyPtr> hash;
 
     hash.insert(RSS09Vocab::self()->title()->uri(), RSSVocab::self()->title());
     hash.insert(RSS09Vocab::self()->description()->uri(), RSSVocab::self()->description());
     hash.insert(RSS09Vocab::self()->link()->uri(), RSSVocab::self()->link());
     hash.insert(RSS09Vocab::self()->name()->uri(), RSSVocab::self()->name());
     hash.insert(RSS09Vocab::self()->url()->uri(), RSSVocab::self()->url());
     hash.insert(RSS09Vocab::self()->image()->uri(), RSSVocab::self()->image());
     hash.insert(RSS09Vocab::self()->textinput()->uri(), RSSVocab::self()->textinput());
 
     QStringList uris09 = RSS09Vocab::self()->properties();
 
     // map statement predicates to RSS 1.0
 
     const QList<StatementPtr> &statements = model.statements();
 
     for (const auto &stmt : statements) {
         const QString predUri = stmt->predicate()->uri();
         if (uris09.contains(predUri)) {
             model.addStatement(stmt->subject(), hash[predUri], stmt->object());
         }
     }
     // map channel type
     QList<ResourcePtr> channels = model.resourcesWithType(RSS09Vocab::self()->channel());
 
     ResourcePtr channel;
 
     if (!channels.isEmpty()) {
         channel = *(channels.begin());
 
         model.removeStatement(channel, RDFVocab::self()->type(), RSS09Vocab::self()->channel());
         model.addStatement(channel, RDFVocab::self()->type(), RSSVocab::self()->channel());
     }
 }
 
 void Parser::ParserPrivate::addSequenceFor09(Model model)
 {
     // RDF 0.9 doesn't contain an item sequence, and the items don't have rdf:about, so add both
 
     const QList<ResourcePtr> items = model.resourcesWithType(RSS09Vocab::self()->item());
 
     if (items.isEmpty()) {
         return;
     }
 
     const QList<ResourcePtr> channels = model.resourcesWithType(RSSVocab::self()->channel());
 
     if (channels.isEmpty()) {
         return;
     }
 
     PropertyPtr itemIndex = model.createProperty(strInternalNs + strItemIndex);
 
     // use QMap here, not QHash. as we need the sorting functionality
     QMap<uint, ResourcePtr> sorted;
 
     for (const ResourcePtr &i : items) {
         QString numstr = i->property(itemIndex)->asString();
         bool ok = false;
         uint num = numstr.toUInt(&ok);
         if (ok) {
             sorted[num] = i;
         }
     }
 
     SequencePtr seq = model.createSequence();
     model.addStatement(channels.first(), RSSVocab::self()->items(), seq);
 
     for (const ResourcePtr &i : std::as_const(sorted)) {
         seq->append(i);
         // add rdf:about (type)
         model.addStatement(i, RDFVocab::self()->type(), RSSVocab::self()->item());
 
         // add to items sequence
         model.addStatement(seq, RDFVocab::self()->li(), i);
     }
 }
 
 Parser::Parser()
     : d(new ParserPrivate)
 {
     d->strInternalNs = QStringLiteral("http://akregator.sf.net/libsyndication/internal#");
     d->strItemIndex = QStringLiteral("itemIndex");
 }
 
 Parser::~Parser() = default;
 
 Parser::Parser(const Parser &other)
     : AbstractParser(other)
     , d(nullptr)
 {
 }
 Parser &Parser::operator=(const Parser & /*other*/)
 {
     return *this;
 }
 
 QString Parser::format() const
 {
     return QStringLiteral("rdf");
 }
 
 } // namespace RDF
 } // namespace Syndication