Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 449 insertions, 0 deletions

diff --git a/xmloff/source/core/RDFaImportHelper.cxx b/xmloff/source/core/RDFaImportHelper.cxx
new file mode 100644
index 000000000..e0cc65698
--- /dev/null
+++ b/xmloff/source/core/RDFaImportHelper.cxx
@@ -0,0 +1,449 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <RDFaImportHelper.hxx>
+
+#include <xmloff/xmlimp.hxx>
+#include <xmloff/nmspmap.hxx>
+
+#include <comphelper/sequence.hxx>
+
+#include <com/sun/star/rdf/URI.hpp>
+#include <com/sun/star/rdf/XDocumentRepository.hpp>
+#include <com/sun/star/rdf/XRepositorySupplier.hpp>
+
+#include <rtl/ustring.hxx>
+#include <sal/log.hxx>
+
+#include <map>
+
+using namespace ::com::sun::star;
+
+namespace xmloff {
+
+namespace {
+
+/** a bit of context for parsing RDFa attributes */
+class RDFaReader
+{
+    const SvXMLImport & m_rImport;
+
+    const SvXMLImport & GetImport() const { return m_rImport; }
+
+    //FIXME: this is an ugly hack to workaround buggy SvXMLImport::GetAbsolute
+    OUString GetAbsoluteReference(OUString const & i_rURI) const
+    {
+        if (i_rURI.isEmpty() || i_rURI[0] == '#')
+        {
+            return GetImport().GetBaseURL() + i_rURI;
+        }
+        else
+        {
+            return GetImport().GetAbsoluteReference(i_rURI);
+        }
+    }
+
+public:
+    explicit RDFaReader(SvXMLImport const & i_rImport)
+        : m_rImport(i_rImport)
+    { }
+
+    // returns URI or blank node!
+    OUString ReadCURIE(OUString const & i_rCURIE) const;
+
+    std::vector< OUString >
+    ReadCURIEs(OUString const & i_rCURIEs) const;
+
+    OUString
+    ReadURIOrSafeCURIE( OUString const & i_rURIOrSafeCURIE) const;
+};
+
+/** helper to insert RDFa statements into the RDF repository */
+class RDFaInserter
+{
+    const uno::Reference<uno::XComponentContext> m_xContext;
+    uno::Reference< rdf::XDocumentRepository > m_xRepository;
+
+    typedef ::std::map< OUString, uno::Reference< rdf::XBlankNode > >
+        BlankNodeMap_t;
+
+    BlankNodeMap_t m_BlankNodeMap;
+
+public:
+    RDFaInserter(uno::Reference<uno::XComponentContext> const & i_xContext,
+            uno::Reference< rdf::XDocumentRepository > const & i_xRepository)
+        : m_xContext(i_xContext)
+        , m_xRepository(i_xRepository)
+    {}
+
+    uno::Reference< rdf::XBlankNode >
+    LookupBlankNode(OUString const & i_rNodeId );
+
+    uno::Reference< rdf::XURI >
+    MakeURI( OUString const & i_rURI) const;
+
+    uno::Reference< rdf::XResource>
+    MakeResource( OUString const & i_rResource);
+
+    void InsertRDFaEntry(struct RDFaEntry const & i_rEntry);
+};
+
+}
+
+/** store parsed RDFa attributes */
+struct ParsedRDFaAttributes
+{
+    OUString m_About;
+    ::std::vector< OUString > m_Properties;
+    OUString m_Content;
+    OUString m_Datatype;
+
+    ParsedRDFaAttributes(
+            OUString const & i_rAbout,
+            ::std::vector< OUString > const & i_rProperties,
+            OUString const & i_rContent,
+            OUString const & i_rDatatype)
+        : m_About(i_rAbout)
+        , m_Properties(i_rProperties)
+        , m_Content(i_rContent)
+        , m_Datatype(i_rDatatype)
+    { }
+};
+
+/** store metadatable object and its RDFa attributes */
+struct RDFaEntry
+{
+    uno::Reference<rdf::XMetadatable> m_xObject;
+    std::shared_ptr<ParsedRDFaAttributes> m_xRDFaAttributes;
+
+    RDFaEntry(uno::Reference<rdf::XMetadatable> const & i_xObject,
+            std::shared_ptr<ParsedRDFaAttributes> const& i_pRDFaAttributes)
+        : m_xObject(i_xObject)
+        , m_xRDFaAttributes(i_pRDFaAttributes)
+    { }
+};
+
+static bool isWS(const sal_Unicode i_Char)
+{
+    return ('\t' == i_Char) || ('\n' == i_Char) || ('\r' == i_Char)
+        || (' ' == i_Char);
+}
+
+static OUString splitAtWS(OUString & io_rString)
+{
+    const sal_Int32 len( io_rString.getLength() );
+    sal_Int32 idxstt(0);
+    while ((idxstt < len) && ( isWS(io_rString[idxstt])))
+        ++idxstt; // skip leading ws
+    sal_Int32 idxend(idxstt);
+    while ((idxend < len) && (!isWS(io_rString[idxend])))
+        ++idxend; // the CURIE
+    const OUString ret(io_rString.copy(idxstt, idxend - idxstt));
+    io_rString = io_rString.copy(idxend); // rest
+    return ret;
+}
+
+OUString
+RDFaReader::ReadCURIE(OUString const & i_rCURIE) const
+{
+    // the RDFa spec says that a prefix is required (it may be empty: ":foo")
+    const sal_Int32 idx( i_rCURIE.indexOf(':') );
+    if (idx >= 0)
+    {
+        OUString Prefix;
+        OUString LocalName;
+        OUString Namespace;
+        // LocalName may contain ':', see "ipchar" in RFC 3987
+        sal_uInt16 nKey( GetImport().GetNamespaceMap().GetKeyByQName(
+            i_rCURIE, &Prefix, &LocalName, &Namespace, SvXMLNamespaceMap::QNameMode::AttrValue) );
+        if ( Prefix == "_" )
+        {
+            // eeek, it's a bnode!
+            // "_" is not a valid URI scheme => we can identify bnodes
+            return i_rCURIE;
+        }
+        else
+        {
+            SAL_WARN_IF(XML_NAMESPACE_NONE == nKey, "xmloff.core", "no namespace?");
+            if ((XML_NAMESPACE_UNKNOWN != nKey) &&
+                (XML_NAMESPACE_XMLNS   != nKey))
+            {
+                // N.B.: empty LocalName is valid!
+                const OUString URI(Namespace + LocalName);
+                return GetAbsoluteReference(URI);
+            }
+            else
+            {
+                SAL_INFO("xmloff.core", "ReadCURIE: invalid CURIE: invalid prefix" );
+                return OUString();
+            }
+        }
+    }
+    SAL_INFO("xmloff.core", "ReadCURIE: invalid CURIE: no prefix" );
+    return OUString();
+}
+
+::std::vector< OUString >
+RDFaReader::ReadCURIEs(OUString const & i_rCURIEs) const
+{
+    std::vector< OUString > vec;
+    OUString CURIEs(i_rCURIEs);
+    do {
+      OUString curie( splitAtWS(CURIEs) );
+      if (!curie.isEmpty())
+      {
+          const OUString uri(ReadCURIE(curie));
+          if (!uri.isEmpty())
+          {
+              vec.push_back(uri);
+          }
+      }
+    }
+    while (!CURIEs.isEmpty());
+    if (vec.empty())
+    {
+        SAL_INFO("xmloff.core", "ReadCURIEs: invalid CURIEs" );
+    }
+    return vec;
+}
+
+OUString
+RDFaReader::ReadURIOrSafeCURIE(OUString const & i_rURIOrSafeCURIE) const
+{
+    const sal_Int32 len(i_rURIOrSafeCURIE.getLength());
+    if (len && (i_rURIOrSafeCURIE[0] == '['))
+    {
+        if ((len >= 2) && (i_rURIOrSafeCURIE[len - 1] == ']'))
+        {
+            return ReadCURIE(i_rURIOrSafeCURIE.copy(1, len - 2));
+        }
+        else
+        {
+            SAL_INFO("xmloff.core", "ReadURIOrSafeCURIE: invalid SafeCURIE" );
+            return OUString();
+        }
+    }
+    else
+    {
+        if (i_rURIOrSafeCURIE.startsWith("_:")) // blank node
+        {
+            SAL_INFO("xmloff.core", "ReadURIOrSafeCURIE: invalid URI: scheme is _" );
+            return OUString();
+        }
+        else
+        {
+            return GetAbsoluteReference(i_rURIOrSafeCURIE);
+        }
+    }
+}
+
+uno::Reference< rdf::XBlankNode >
+RDFaInserter::LookupBlankNode(OUString const & i_rNodeId )
+{
+    uno::Reference< rdf::XBlankNode > & rEntry( m_BlankNodeMap[ i_rNodeId ] );
+    if (!rEntry.is())
+    {
+        rEntry = m_xRepository->createBlankNode();
+    }
+    return rEntry;
+}
+
+uno::Reference< rdf::XURI >
+RDFaInserter::MakeURI( OUString const & i_rURI) const
+{
+    if (i_rURI.startsWith("_:")) // blank node
+    {
+        SAL_INFO("xmloff.core", "MakeURI: cannot create URI for blank node");
+        return nullptr;
+    }
+    else
+    {
+        try
+        {
+            return rdf::URI::create( m_xContext, i_rURI );
+        }
+        catch (uno::Exception &)
+        {
+            SAL_WARN("xmloff.core", "MakeURI: cannot create URI");
+            return nullptr;
+        }
+    }
+}
+
+uno::Reference<rdf::XResource>
+RDFaInserter::MakeResource( OUString const & i_rResource)
+{
+    if (i_rResource.startsWith("_:")) // blank node
+    {
+        // we cannot use the blank node label as-is: it must be distinct
+        // from labels in other graphs, so create fresh ones per XML stream
+        // N.B.: content.xml and styles.xml are distinct graphs
+        OUString name( i_rResource.copy(2) );
+        const uno::Reference< rdf::XBlankNode > xBNode( LookupBlankNode(name) );
+        SAL_WARN_IF(!xBNode.is(), "xmloff.core", "no blank node?");
+        return xBNode;
+    }
+    else
+    {
+        return MakeURI( i_rResource );
+    }
+}
+
+void RDFaInserter::InsertRDFaEntry(
+    struct RDFaEntry const & i_rEntry)
+{
+    SAL_WARN_IF(!i_rEntry.m_xObject.is(), "xmloff.core", "InsertRDFaEntry: invalid arg: null object");
+    if (!i_rEntry.m_xObject.is()) return;
+
+    const uno::Reference< rdf::XResource > xSubject(
+        MakeResource( i_rEntry.m_xRDFaAttributes->m_About ) );
+    if (!xSubject.is())
+    {
+        return; // invalid
+    }
+
+    ::std::vector< uno::Reference< rdf::XURI > > predicates;
+
+    predicates.reserve(i_rEntry.m_xRDFaAttributes->m_Properties.size());
+
+    for (OUString const& prop : i_rEntry.m_xRDFaAttributes->m_Properties)
+    {
+        auto const xURI(MakeURI(prop));
+        if (xURI.is())
+        {
+            predicates.push_back(xURI);
+        }
+    }
+
+    if (predicates.empty())
+    {
+        return; // invalid
+    }
+
+    uno::Reference<rdf::XURI> xDatatype;
+    if (!i_rEntry.m_xRDFaAttributes->m_Datatype.isEmpty())
+    {
+        xDatatype = MakeURI( i_rEntry.m_xRDFaAttributes->m_Datatype );
+    }
+
+    try
+    {
+        // N.B.: this will call xMeta->ensureMetadataReference, which is why
+        // this must be done _after_ importing the whole XML file,
+        // to prevent collision between generated ids and ids in the file
+        m_xRepository->setStatementRDFa(xSubject, comphelper::containerToSequence(predicates),
+            i_rEntry.m_xObject,
+            i_rEntry.m_xRDFaAttributes->m_Content, xDatatype);
+    }
+    catch (uno::Exception &)
+    {
+        SAL_WARN("xmloff.core", "InsertRDFaEntry: setStatementRDFa failed?");
+    }
+}
+
+RDFaImportHelper::RDFaImportHelper(const SvXMLImport & i_rImport)
+    : m_rImport(i_rImport)
+{
+}
+
+RDFaImportHelper::~RDFaImportHelper()
+{
+}
+
+std::shared_ptr<ParsedRDFaAttributes>
+RDFaImportHelper::ParseRDFa(
+    OUString const & i_rAbout,
+    OUString const & i_rProperty,
+    OUString const & i_rContent,
+    OUString const & i_rDatatype)
+{
+    if (i_rProperty.isEmpty())
+    {
+        SAL_INFO("xmloff.core", "AddRDFa: invalid input: xhtml:property empty");
+        return std::shared_ptr<ParsedRDFaAttributes>();
+    }
+    // must parse CURIEs here: need namespace declaration context
+    RDFaReader reader(GetImport());
+    const OUString about( reader.ReadURIOrSafeCURIE(i_rAbout) );
+    if (about.isEmpty()) {
+        return std::shared_ptr<ParsedRDFaAttributes>();
+    }
+    const ::std::vector< OUString > properties(
+        reader.ReadCURIEs(i_rProperty) );
+    if (properties.empty()) {
+        return std::shared_ptr<ParsedRDFaAttributes>();
+    }
+    const OUString datatype( !i_rDatatype.isEmpty()
+        ?   reader.ReadCURIE(i_rDatatype)
+        :   OUString() );
+    return std::make_shared<ParsedRDFaAttributes>(
+            about, properties, i_rContent, datatype);
+}
+
+void
+RDFaImportHelper::AddRDFa(
+    uno::Reference<rdf::XMetadatable> const & i_xObject,
+    std::shared_ptr<ParsedRDFaAttributes> const & i_pRDFaAttributes)
+{
+    if (!i_xObject.is())
+    {
+        SAL_WARN("xmloff.core", "AddRDFa: invalid arg: null textcontent");
+        return;
+    }
+    if (!i_pRDFaAttributes)
+    {
+        SAL_WARN("xmloff.core", "AddRDFa: invalid arg: null RDFa attributes");
+        return;
+    }
+    m_RDFaEntries.emplace_back(i_xObject, i_pRDFaAttributes);
+}
+
+void
+RDFaImportHelper::ParseAndAddRDFa(
+    uno::Reference<rdf::XMetadatable> const & i_xObject,
+    OUString const & i_rAbout,
+    OUString const & i_rProperty,
+    OUString const & i_rContent,
+    OUString const & i_rDatatype)
+{
+    std::shared_ptr<ParsedRDFaAttributes> pAttributes(
+        ParseRDFa(i_rAbout, i_rProperty, i_rContent, i_rDatatype) );
+    if (pAttributes)
+    {
+        AddRDFa(i_xObject, pAttributes);
+    }
+}
+
+void RDFaImportHelper::InsertRDFa(
+    uno::Reference< rdf::XRepositorySupplier> const & i_xModel)
+{
+    SAL_WARN_IF(!i_xModel.is(), "xmloff.core", "InsertRDFa: invalid arg: model null");
+    if (!i_xModel.is()) return;
+    const uno::Reference< rdf::XDocumentRepository > xRepository(
+        i_xModel->getRDFRepository(), uno::UNO_QUERY);
+    SAL_WARN_IF(!xRepository.is(), "xmloff.core", "InsertRDFa: no DocumentRepository?");
+    if (!xRepository.is()) return;
+    RDFaInserter inserter(GetImport().GetComponentContext(), xRepository);
+    for (const auto& RDFaEntry : m_RDFaEntries)
+        inserter.InsertRDFaEntry(RDFaEntry);
+}
+
+} // namespace xmloff
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */