Add a few useful lookup functions.

1 files changed, 60 insertions, 0 deletions

diff --git a/src/xml/repr-util.cpp b/src/xml/repr-util.cpp
index a5dea02a2..a02997105 100644
--- a/src/xml/repr-util.cpp
+++ b/src/xml/repr-util.cpp
@@ -21,6 +21,8 @@
 
 
 #include <glib.h>
+#include <glibmm.h>
+
 #include <2geom/point.h>
 #include "svg/stringstream.h"
 #include "svg/css-ostringstream.h"
@@ -334,6 +336,36 @@ Inkscape::XML::Node *sp_repr_lookup_child(Inkscape::XML::Node *repr,
     return nullptr;
 }
 
+/**
+ * Recursive version of sp_repr_lookup_child().
+ */
+Inkscape::XML::Node const *sp_repr_lookup_descendant(Inkscape::XML::Node const *repr,
+                                                     gchar const *key,
+                                                     gchar const *value)
+{
+    Inkscape::XML::Node const *found = nullptr;
+    g_return_val_if_fail(repr != nullptr, NULL);
+    gchar const *repr_value = repr->attribute(key);
+    if ( (repr_value == value) ||
+         (repr_value && value && strcmp(repr_value, value) == 0) ) {
+        found = repr;
+    } else {
+        for (Inkscape::XML::Node const *child = repr->firstChild() ; child && !found; child = child->next() ) {
+            found = sp_repr_lookup_descendant( child, key, value );
+        }
+    }
+    return found;
+}
+
+
+Inkscape::XML::Node *sp_repr_lookup_descendant(Inkscape::XML::Node *repr,
+                                              gchar const *key,
+                                              gchar const *value)
+{
+    Inkscape::XML::Node const *found = sp_repr_lookup_descendant( const_cast<Inkscape::XML::Node const *>(repr), key, value );
+    return const_cast<Inkscape::XML::Node *>(found);
+}
+
 Inkscape::XML::Node const *sp_repr_lookup_name( Inkscape::XML::Node const *repr, gchar const *name, gint maxdepth )
 {
     Inkscape::XML::Node const *found = nullptr;
@@ -391,6 +423,34 @@ std::vector<Inkscape::XML::Node const *> sp_repr_lookup_name_many( Inkscape::XML
     return nodes;
 }
 
+std::vector<Inkscape::XML::Node *>
+sp_repr_lookup_property_many( Inkscape::XML::Node *repr, Glib::ustring const& property,
+                              Glib::ustring const &value, int maxdepth )
+{
+    std::vector<Inkscape::XML::Node *> nodes;
+    std::vector<Inkscape::XML::Node *> found;
+    g_return_val_if_fail(repr     != nullptr, nodes);
+
+    SPCSSAttr* css = sp_repr_css_attr (repr, "style");
+    if (value == sp_repr_css_property (css, property, "")) {
+        nodes.push_back(repr);
+    }
+
+    if ( maxdepth != 0 ) {
+        // maxdepth == -1 means unlimited
+        if ( maxdepth == -1 ) {
+            maxdepth = 0;
+        }
+
+        for (Inkscape::XML::Node *child = repr->firstChild() ; child; child = child->next() ) {
+            found = sp_repr_lookup_property_many( child, property, value, maxdepth - 1);
+            nodes.insert(nodes.end(), found.begin(), found.end());
+        }
+    }
+
+    return nodes;
+}
+
 /**
  * Determine if the node is a 'title', 'desc' or 'metadata' element.
  */