Make statement sink take a statement rather than nodes

This makes the interface more extensible, towards associating more information
with statements.  The serd_sink_write_nodes wrapper remains so that user code
does not need to allocate in order to write statement.

1 files changed, 8 insertions, 6 deletions

diff --git a/src/writer.c b/src/writer.c
index 807ae8be..cbd3baa6 100644
--- a/src/writer.c
+++ b/src/writer.c
@@ -682,13 +682,15 @@ write_list_obj(SerdWriter*        writer,
 }
 
 static SerdStatus
-serd_writer_write_statement(SerdWriter*        writer,
-                            SerdStatementFlags flags,
-                            const SerdNode*    graph,
-                            const SerdNode*    subject,
-                            const SerdNode*    predicate,
-                            const SerdNode*    object)
+serd_writer_write_statement(SerdWriter*          writer,
+                            SerdStatementFlags   flags,
+                            const SerdStatement* statement)
 {
+	const SerdNode* const subject   = serd_statement_get_subject(statement);
+	const SerdNode* const predicate = serd_statement_get_predicate(statement);
+	const SerdNode* const object    = serd_statement_get_object(statement);
+	const SerdNode* const graph     = serd_statement_get_graph(statement);
+
 	if (!subject || !predicate || !object ||
 	    !is_resource(subject) || !is_resource(predicate)) {
 		return SERD_ERR_BAD_ARG;