src/svgtiny_css.c: implement get_libcss_node_data() select handler

[libsvgtiny.git] / src / svgtiny_css.c

diff --git a/src/svgtiny_css.c b/src/svgtiny_css.c
index dc2a613ea7878a933121885b066ae59d31879582..67f9fcddb48b38dd05baf0ffe2a592b9dc07d17c 100644 (file)
--- a/src/svgtiny_css.c
+++ b/src/svgtiny_css.c
@@ -47,6 +47,7 @@ static css_error node_count_siblings(void *pw, void *node,
                bool same_name, bool after, int32_t *count);
 static css_error node_is_empty(void *pw, void *node, bool *is_empty);
 static css_error node_is_link(void *pw, void *node, bool *is_link);
+static css_error node_is_visited(void *pw, void *node, bool *is_visited);
 static css_error node_is_hover(void *pw, void *node, bool *is_hover);
 static css_error node_is_active(void *pw, void *node, bool *is_active);
 static css_error node_is_focus(void *pw, void *node, bool *is_focus);
@@ -56,6 +57,12 @@ static css_error node_is_checked(void *pw, void *node, bool *is_checked);
 static css_error node_is_target(void *pw, void *node, bool *is_target);
 static css_error node_is_lang(void *pw, void *node,
                lwc_string *lang, bool *is_lang);
+static css_error ua_default_for_property(void *pw, uint32_t property,
+       css_hint *hint);
+static css_error set_libcss_node_data(void *pw, void *node,
+               void *libcss_node_data);
+static css_error get_libcss_node_data(void *pw, void *node,
+               void **libcss_node_data);
 
 
 /**
@@ -1512,6 +1519,26 @@ css_error node_is_link(void *pw, void *node, bool *is_link)
        return CSS_OK;
 }
 
+/**
+ * Check if the given node is a link that has been visited already
+ *
+ * This check always fails because the SVG DOM does not have the
+ * necessary information (it's a UI property).
+ *
+ * \param pw           Pointer to the current SVG parser state; unused
+ * \param node         Libdom SVG node to check; unused
+ * \param is_visited   Pointer to the boolean return value
+ *
+ * \return Always returns CSS_OK
+ */
+css_error node_is_visited(void *pw, void *node, bool *is_visited)
+{
+       UNUSED(pw);
+       UNUSED(node);
+       *is_visited = false;
+       return CSS_OK;
+}
+
 
 /**
  * Check if the given node is being "hovered" over
@@ -1742,3 +1769,91 @@ static css_error node_is_lang(void *pw, void *node,
        lwc_string_destroy(attr.name);
        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;
+}