From: Michael Orlitzky <michael@orlitzky.com>
Date: Tue, 17 Oct 2023 20:41:37 +0000 (-0400)
Subject: src/svgtiny_css.c: implement named_ancestor_node() select handler
X-Git-Url: http://gitweb.michael.orlitzky.com/?a=commitdiff_plain;h=1494831bf29ad3bcbc2c02cb50e0c95795a88005;p=libsvgtiny.git

src/svgtiny_css.c: implement named_ancestor_node() select handler
---

diff --git a/src/svgtiny_css.c b/src/svgtiny_css.c
index f01c3b4..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,
@@ -240,6 +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