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

diff --git a/src/svgtiny_css.c b/src/svgtiny_css.c
index 66ccd01d97a30eebc9d3bc3533be8770646d88dd..0267325df7a7a7b202a36ffd1434e233a644469e 100644 (file)
--- a/src/svgtiny_css.c
+++ b/src/svgtiny_css.c
@@ -21,6 +21,8 @@ static css_error node_has_class(void *pw, void *node,
                lwc_string *name, bool *match);
 static css_error node_has_id(void *pw, void *node,
                lwc_string *name, bool *match);
+static css_error node_has_attribute(void *pw, void *node,
+               const css_qname *qname, bool *match);
 
 
 /**
@@ -620,3 +622,46 @@ css_error node_has_id(void *pw, void *node,
 
        return CSS_OK;
 }
+
+
+/**
+ * Test the given node for the given attribute
+ *
+ * This will return true (via the "match" pointer) if the libdom node
+ * has an attribute with the given name. The comparison is
+ * case-sensitive. It corresponds to node[attr] in CSS.
+ *
+ * \param pw       Pointer to the current SVG parser state
+ * \param node     Libdom SVG node to test
+ * \param qname    Attribute name to check for
+ * \param match    Pointer to the test result
+ *
+ * \return Returns CSS_OK if successful and CSS_NOMEM if anything
+ *         goes wrong
+ */
+css_error node_has_attribute(void *pw, void *node,
+               const css_qname *qname, bool *match)
+{
+       UNUSED(pw);
+       dom_string *name;
+       dom_exception err;
+
+       /* intern the attribute name as a dom_string so we can
+        * delegate to dom_element_has_attribute() */
+       err = dom_string_create_interned(
+               (const uint8_t *) lwc_string_data(qname->name),
+               lwc_string_length(qname->name),
+               &name);
+       if (err != DOM_NO_ERR) {
+               return CSS_NOMEM;
+       }
+
+       err = dom_element_has_attribute((dom_node *)node, name, match);
+       if (err != DOM_NO_ERR) {
+               dom_string_unref(name);
+               return CSS_OK;
+       }
+
+       dom_string_unref(name);
+       return CSS_OK;
+}