X-Git-Url: https://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2Fsvgtiny_css.c;h=3da3c8e165f34b0d6fb09cdcc04c488ecda3e0f8;hb=7b8fc7bb381c266a4f1ecde5b10bb4c09e2f9bc0;hp=97d6307d69c015ad8cf30ef58d1579c772ec9087;hpb=1494831bf29ad3bcbc2c02cb50e0c95795a88005;p=libsvgtiny.git

diff --git a/src/svgtiny_css.c b/src/svgtiny_css.c
index 97d6307..3da3c8e 100644
--- a/src/svgtiny_css.c
+++ b/src/svgtiny_css.c
@@ -4,6 +4,7 @@
 #include "svgtiny.h"
 #include "svgtiny_internal.h"
 
+/* select handler callbacks */
 static css_error node_name(void *pw, void *node, css_qname *qname);
 static css_error node_classes(void *pw, void *node,
 		lwc_string ***classes, uint32_t *n_classes);
@@ -68,6 +69,38 @@ static css_error set_libcss_node_data(void *pw, void *node,
 static css_error get_libcss_node_data(void *pw, void *node,
 		void **libcss_node_data);
 
+/* select handler vtable */
+static struct css_select_handler svgtiny_select_handler;
+
+
+/* Every call to svgtiny_select_style() needs this, so let's only make
+ * one copy. */
+static const css_media media_all = {
+	.type = CSS_MEDIA_ALL,
+};
+
+/**
+ * Convenient wrapper around css_select_style()
+ *
+ * \param state         The current state of the libsvgtiny parser
+ * \param node          The node that we're getting styles for
+ * \param inline_sheet  The inline stylesheet for the given node
+ * \param result        Address at which to store the results array
+ */
+css_error svgtiny_select_style(struct svgtiny_parse_state *state,
+				dom_element *node,
+				const css_stylesheet *inline_sheet,
+				css_select_results **result)
+{
+	return css_select_style(state->select_ctx,
+			node,
+			&state->unit_ctx,
+			&media_all,
+			inline_sheet,
+			&svgtiny_select_handler,
+			state,
+			result);
+}
 
 /**
  * Resolve a relative URL to an absolute one by doing nothing. This is
@@ -1856,6 +1889,57 @@ css_error ua_default_for_property(void *pw, uint32_t property,
 }
 
 
+/**
+ * A "user handler" function that we pass to dom_node_set_user_data()
+ * in set_libcss_node_data(). The set_libcss_node_data() documentation
+ * says that if the node (on which data is set) is is deleted or
+ * cloned, or if its ancestors are modified, then we must call
+ * css_libcss_node_data_handler() on the user data. This function
+ * basically just checks to see which DOM event has happened and
+ * calls css_libcss_node_data_handler() when any of those criteria
+ * are met.
+ */
+static void svgtiny_dom_user_data_handler(dom_node_operation operation,
+	dom_string *key, void *data, struct dom_node *src,
+	struct dom_node *dst)
+{
+	/* We only care about the userdata that is identified by our
+	 * userdata key. Unfortunately I see no obvious way to obtain
+	 * the copy of the userdata key that is already interned in
+	 * svgtiny_strings.h; so we duplicate it here (ugh). */
+	dom_string *str;
+	dom_string_create((const uint8_t *)"_libcss_user_data", 17, &str);
+	if (dom_string_isequal(str,key) == false || data == NULL) {
+		/* Wrong key, or no data */
+		return;
+	}
+
+	/* Check the DOM operation, and make the corresponding call to
+	 * css_libcss_node_data_handler(). No error handling is done.
+	 */
+	switch (operation) {
+		case DOM_NODE_CLONED:
+			css_libcss_node_data_handler(&svgtiny_select_handler,
+						CSS_NODE_CLONED,
+						NULL, src, dst, data);
+			break;
+		case DOM_NODE_RENAMED:
+			css_libcss_node_data_handler(&svgtiny_select_handler,
+						CSS_NODE_MODIFIED,
+						NULL, src, NULL, data);
+			break;
+		case DOM_NODE_IMPORTED:
+		case DOM_NODE_ADOPTED:
+		case DOM_NODE_DELETED:
+			css_libcss_node_data_handler(&svgtiny_select_handler,
+						CSS_NODE_DELETED,
+						NULL, src, NULL, data);
+		default:
+			/* Our list of cases should have been exhaustive */
+			assert(false);
+	}
+}
+
 /**
  * Store libcss data on a node
  *
@@ -1876,15 +1960,12 @@ css_error set_libcss_node_data(void *pw, void *node,
 	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. */
+	 * data. */
 	state = (struct svgtiny_parse_state *)pw;
 	dom_node_set_user_data((dom_node *)node,
 				state->interned_userdata_key,
 				libcss_node_data,
-				NULL,
+				svgtiny_dom_user_data_handler,
 				&old_data);
 
 	/* dom_node_set_user_data() always returns DOM_NO_ERR */
@@ -1920,3 +2001,50 @@ css_error get_libcss_node_data(void *pw, void *node,
 	/* 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,
+};
+
+