X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2Fsvgtiny_css.c;h=97d6307d69c015ad8cf30ef58d1579c772ec9087;hb=1494831bf29ad3bcbc2c02cb50e0c95795a88005;hp=4e42888d59c83925d8ce3fa77eb30cb277525cdd;hpb=884fd8bb7fd5b7df1aac30d2084281de23f3a744;p=libsvgtiny.git

diff --git a/src/svgtiny_css.c b/src/svgtiny_css.c
index 4e42888..97d6307 100644
--- a/src/svgtiny_css.c
+++ b/src/svgtiny_css.c
@@ -8,6 +8,8 @@ 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);
 static css_error node_id(void *pw, void *node, lwc_string **id);
+static css_error named_ancestor_node(void *pw, void *node,
+		const css_qname *qname, void **ancestor);
 static css_error named_parent_node(void *pw, void *node,
 		const css_qname *qname, void **parent);
 static css_error named_sibling_node(void *pw, void *node,
@@ -57,8 +59,14 @@ 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 node_presentational_hint(void *pw, void *node,
+		uint32_t *nhints, css_hint **hints);
 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);
 
 
 /**
@@ -234,6 +242,40 @@ css_error node_id(void *pw, void *node, lwc_string **id)
 }
 
 
+/**
+ * Find the first ancestor of the given element having the given name
+ *
+ * This function thinly wraps dom_element_named_ancestor_node(), which
+ * performs exactly the search we want.
+ *
+ * \param pw        Pointer to the current SVG parser state
+ * \param node      Libdom SVG node whose ancestor we want
+ * \param qname     Name of the ancestor node to search for
+ * \param ancestor  Address at which to store the ancestor node pointer
+ *
+ * \return Always returns CSS_OK
+ *
+ * \post If a suitable element is found, a pointer to it will be
+ *       stored at the address pointed to by \a ancestor; otherwise,
+ *       NULL will be stored at the address pointed to by \a ancestor
+ */
+css_error named_ancestor_node(void *pw, void *node,
+		const css_qname *qname, void **ancestor)
+{
+	UNUSED(pw);
+
+	/* It's OK if node isn't an element, libdom checks for it. */
+	dom_element_named_ancestor_node((dom_element *)node,
+			qname->name,
+			(struct dom_element **)ancestor);
+
+	/* A comment in named_parent_node() explains why we unref
+	 * this here. */
+	dom_node_unref(*ancestor);
+
+	return CSS_OK;
+}
+
 
 /**
  * Find the first parent of the given element having the given name
@@ -1767,6 +1809,31 @@ static css_error node_is_lang(void *pw, void *node,
 }
 
 
+/**
+ * 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
  *
@@ -1787,3 +1854,69 @@ css_error ua_default_for_property(void *pw, uint32_t 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;
+}