+
+
+/**
+ * Return presentational hints for the given node
+ *
+ * Unless an SVG is being rendered from within an HTML document,
+ * there are no presentational hints. We always return an empty
+ * array (no hints).
+ *
+ * \param pw Pointer to the current SVG parser state; unused
+ * \param node Libdom SVG node whose hints we want; unused
+ * \param nhints How many hints are returned (return by reference)
+ * \param hints Array of css_hint structures (return by reference)
+ *
+ * \return Always returns CSS_OK
+ */
+css_error node_presentational_hint(void *pw, void *node,
+ uint32_t *nhints, css_hint **hints)
+{
+ UNUSED(pw);
+ UNUSED(node);
+ *nhints = 0;
+ *hints = NULL;
+ return CSS_OK;
+}
+
+
+/**
+ * User-agent defaults for CSS properties
+ *
+ * For the moment, we provide no defaults, because libsvgtiny does not
+ * yet support any CSS properties that might need them.
+ *
+ * \param pw Pointer to the current SVG parser state; unused
+ * \param property LibCSS property identifier; unused
+ * \param hint Pointer to hint object (a return value); unused
+ *
+ * \return Always returns CSS_INVALID
+ */
+css_error ua_default_for_property(void *pw, uint32_t property,
+ css_hint *hint)
+{
+ UNUSED(pw);
+ UNUSED(property);
+ UNUSED(hint);
+ return CSS_INVALID;
+}
+
+
+/**
+ * Store libcss data on a node
+ *
+ * This is part of the libcss select handler API that we need to
+ * implement. It is essentially a thin dom_node_set_user_data()
+ * wrapper.
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node on which to store the data
+ * \param libcss_node_data Pointer to the data to store
+ *
+ * \return Always returns CSS_OK
+ */
+css_error set_libcss_node_data(void *pw, void *node,
+ void *libcss_node_data)
+{
+ struct svgtiny_parse_state *state;
+ void *old_data;
+
+ /* A unique "userdata key" (a string) is used to identify this
+ * data. The fourth parameter (NULL) is a "user handler
+ * function." We will eventually have one, but for now we set
+ * it to NULL to avoid a circular reference mess that would
+ * break the build temporarily. */
+ state = (struct svgtiny_parse_state *)pw;
+ dom_node_set_user_data((dom_node *)node,
+ state->interned_userdata_key,
+ libcss_node_data,
+ NULL,
+ &old_data);
+
+ /* dom_node_set_user_data() always returns DOM_NO_ERR */
+ return CSS_OK;
+}
+
+
+/**
+ * Retrieve libcss data from a node
+ *
+ * This is part of the libcss select handler API that we need to
+ * implement. It is essentially a thin dom_node_get_user_data()
+ * wrapper.
+ *
+ * \param pw Pointer to the current SVG parser state
+ * \param node Libdom SVG node from which to get the data
+ * \param libcss_node_data Address at which to store a pointer to the data
+ *
+ * \return Always returns CSS_OK
+ */
+css_error get_libcss_node_data(void *pw, void *node,
+ void **libcss_node_data)
+{
+ struct svgtiny_parse_state *state;
+
+ /* A unique "userdata key" (a string) is used to identify this
+ * data. */
+ state = (struct svgtiny_parse_state *)pw;
+ dom_node_get_user_data((dom_node *)node,
+ state->interned_userdata_key,
+ libcss_node_data);
+
+ /* dom_node_get_user_data() always returns DOM_NO_ERR */
+ return CSS_OK;
+}
+
+
+/**
+ * The vtable of select handler callbacks passed by libsvgtiny to
+ * css_select_style().
+ */
+static css_select_handler svgtiny_select_handler = {
+ CSS_SELECT_HANDLER_VERSION_1,
+ node_name,
+ node_classes,
+ node_id,
+ named_ancestor_node,
+ named_parent_node,
+ named_sibling_node,
+ named_generic_sibling_node,
+ parent_node,
+ sibling_node,
+ node_has_name,
+ node_has_class,
+ node_has_id,
+ node_has_attribute,
+ node_has_attribute_equal,
+ node_has_attribute_dashmatch,
+ node_has_attribute_includes,
+ node_has_attribute_prefix,
+ node_has_attribute_suffix,
+ node_has_attribute_substring,
+ node_is_root,
+ node_count_siblings,
+ node_is_empty,
+ node_is_link,
+ node_is_visited,
+ node_is_hover,
+ node_is_active,
+ node_is_focus,
+ node_is_enabled,
+ node_is_disabled,
+ node_is_checked,
+ node_is_target,
+ node_is_lang,
+ node_presentational_hint,
+ ua_default_for_property,
+ set_libcss_node_data,
+ get_libcss_node_data,
+};