1 files changed, 178 insertions, 0 deletions
diff --git a/src/object/sp-metadata.cpp b/src/object/sp-metadata.cpp
new file mode 100644
index 0000000..5a91eab
--- /dev/null
+++ b/src/object/sp-metadata.cpp
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SVG <metadata> implementation
+ *
+ * Authors:
+ *   Kees Cook <kees@outflux.net>
+ *
+ * Copyright (C) 2004 Kees Cook
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "sp-metadata.h"
+
+#include <regex>
+
+#include "xml/node-iterators.h"
+#include "document.h"
+
+#include "sp-item-group.h"
+#include "sp-root.h"
+
+#define noDEBUG_METADATA
+#ifdef DEBUG_METADATA
+# define debug(f, a...) { g_print("%s(%d) %s:", \
+                                  __FILE__,__LINE__,__FUNCTION__); \
+                          g_print(f, ## a); \
+                          g_print("\n"); \
+                        }
+#else
+# define debug(f, a...) /**/
+#endif
+
+/* Metadata base class */
+
+SPMetadata::SPMetadata() : SPObject() {
+}
+
+SPMetadata::~SPMetadata() = default;
+
+namespace {
+
+void strip_ids_recursively(Inkscape::XML::Node *node) {
+    using Inkscape::XML::NodeSiblingIterator;
+    if ( node->type() == Inkscape::XML::NodeType::ELEMENT_NODE ) {
+        node->removeAttribute("id");
+    }
+    for ( NodeSiblingIterator iter=node->firstChild() ; iter ; ++iter ) {
+        strip_ids_recursively(iter);
+    }
+}
+
+/**
+ * Return true if the given metadata belongs to a CorelDraw layer.
+ */
+bool is_corel_layer_metadata(SPMetadata const &metadata)
+{
+    char const *id = metadata.getId();
+    return id &&                                  //
+           g_str_has_prefix(id, "CorelCorpID") && //
+           g_str_has_suffix(id, "Corel-Layer");
+}
+
+/**
+ * Get the label of a CorelDraw layer.
+ */
+std::string corel_layer_get_label(SPGroup const &layer)
+{
+    char const *id = layer.getId();
+    if (id) {
+        return std::regex_replace(id, std::regex("_x0020_"), " ");
+    }
+    return "<unnamed-corel-layer>";
+}
+}
+
+
+void SPMetadata::build(SPDocument* doc, Inkscape::XML::Node* repr) {
+    using Inkscape::XML::NodeSiblingIterator;
+
+    debug("0x%08x",(unsigned int)this);
+
+    /* clean up our mess from earlier versions; elements under rdf:RDF should not
+     * have id= attributes... */
+    static GQuark const rdf_root_name = g_quark_from_static_string("rdf:RDF");
+
+    for ( NodeSiblingIterator iter=repr->firstChild() ; iter ; ++iter ) {
+        if ( (GQuark)iter->code() == rdf_root_name ) {
+            strip_ids_recursively(iter);
+        }
+    }
+
+    SPObject::build(doc, repr);
+}
+
+void SPMetadata::release() {
+    debug("0x%08x",(unsigned int)this);
+
+    // handle ourself
+
+    SPObject::release();
+}
+
+void SPMetadata::set(SPAttr key, const gchar* value) {
+    debug("0x%08x %s(%u): '%s'",(unsigned int)this,
+          sp_attribute_name(key),key,value);
+
+    // see if any parents need this value
+    SPObject::set(key, value);
+}
+
+void SPMetadata::update(SPCtx* /*ctx*/, unsigned int flags) {
+    debug("0x%08x",(unsigned int)this);
+    //SPMetadata *metadata = SP_METADATA(object);
+
+    if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG |
+                 SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
+
+        /* do something? */
+
+        // Detect CorelDraw layers
+        if (is_corel_layer_metadata(*this)) {
+            auto layer = dynamic_cast<SPGroup *>(parent);
+            if (layer && layer->layerMode() == SPGroup::GROUP) {
+                layer->setLayerMode(SPGroup::LAYER);
+                if (!layer->label()) {
+                    layer->setLabel(corel_layer_get_label(*layer).c_str());
+                }
+            }
+        }
+    }
+
+//    SPObject::onUpdate(ctx, flags);
+}
+
+Inkscape::XML::Node* SPMetadata::write(Inkscape::XML::Document* doc, Inkscape::XML::Node* repr, guint flags) {
+    debug("0x%08x",(unsigned int)this);
+
+    if ( repr != this->getRepr() ) {
+        if (repr) {
+            repr->mergeFrom(this->getRepr(), "id");
+        } else {
+            repr = this->getRepr()->duplicate(doc);
+        }
+    }
+
+    SPObject::write(doc, repr, flags);
+
+    return repr;
+}
+
+/**
+ * Retrieves the metadata object associated with a document.
+ */
+SPMetadata *sp_document_metadata(SPDocument *document)
+{
+    SPObject *nv;
+
+    g_return_val_if_fail (document != nullptr, NULL);
+
+    nv = sp_item_group_get_child_by_name( document->getRoot(), nullptr,
+                                        "metadata");
+    g_assert (nv != nullptr);
+
+    return (SPMetadata *)nv;
+}
+
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :