Fix Wswitch-enum warnings

src/env.c

@@ -210,6 +210,13 @@ serd_env_expand_node(const SerdEnv*  env,
                      const SerdNode* node)
 {
 	switch (node->type) {
+	case SERD_NOTHING:
+	case SERD_LITERAL:
+		break;
+	case SERD_URI: {
+		SerdURI ignored;
+		return serd_node_new_uri_from_node(node, &env->base_uri, &ignored);
+	}
 	case SERD_CURIE: {
 		SerdChunk prefix;
 		SerdChunk suffix;
@@ -223,13 +230,10 @@ serd_env_expand_node(const SerdEnv*  env,
 		ret.n_chars = serd_strlen(buf, NULL, NULL);
 		return ret;
 	}
-	case SERD_URI: {
-		SerdURI ignored;
-		return serd_node_new_uri_from_node(node, &env->base_uri, &ignored);
-	}
-	default:
-		return SERD_NODE_NULL;
+	case SERD_BLANK:
+		break;
 	}
+	return SERD_NODE_NULL;
 }
 
 void

src/writer.c

@@ -642,6 +642,8 @@ write_node(SerdWriter*        writer,
 {
 	bool ret = false;
 	switch (node->type) {
+	case SERD_NOTHING:
+		break;
 	case SERD_LITERAL:
 		ret = write_literal(writer, node, datatype, lang, flags);
 		break;
@@ -653,7 +655,7 @@ write_node(SerdWriter*        writer,
 		break;
 	case SERD_BLANK:
 		ret = write_blank(writer, node, field, flags);
-	default: break;
+		break;
 	}
 	writer->last_sep = SEP_NONE;
 	return ret;
@@ -715,9 +717,7 @@ serd_writer_write_statement(SerdWriter*        writer,
 		} \
 	} while (0)
 
-	switch (writer->syntax) {
-	case SERD_NTRIPLES:
-	case SERD_NQUADS:
+	if (writer->syntax == SERD_NTRIPLES || writer->syntax == SERD_NQUADS) {
 		TRY(write_node(writer, subject, NULL, NULL, FIELD_SUBJECT, flags));
 		sink(" ", 1, writer);
 		TRY(write_node(writer, predicate, NULL, NULL, FIELD_PREDICATE, flags));
@@ -729,8 +729,6 @@ serd_writer_write_statement(SerdWriter*        writer,
 		}
 		sink(" .\n", 3, writer);
 		return SERD_SUCCESS;
-	default:
-		break;
 	}
 
 	if ((graph && !serd_node_equals(graph, &writer->context.graph)) ||

tests/serd_test.c

@@ -486,6 +486,10 @@ test_env(void)
 	const SerdNode lit = serd_node_from_string(SERD_LITERAL, USTR("hello"));
 	assert(serd_env_set_prefix(env, &b, &lit));
 
+	const SerdNode blank  = serd_node_from_string(SERD_BLANK, USTR("b1"));
+	const SerdNode xblank = serd_env_expand_node(env, &blank);
+	assert(serd_node_equals(&xblank, &SERD_NODE_NULL));
+
 	int n_prefixes = 0;
 	serd_env_set_prefix_from_strings(env, USTR("eg.2"), USTR("http://example.org/"));
 	serd_env_foreach(env, count_prefixes, &n_prefixes);
@@ -588,6 +592,23 @@ test_writer(const char* const path)
 
 	assert(!strcmp((const char*)out, "@base <http://example.org/base> .\n"));
 	serd_free(out);
+
+	// Test writing empty node
+	SerdNode    nothing = serd_node_from_string(SERD_NOTHING, USTR(""));
+	FILE* const empty   = tmpfile();
+
+	writer = serd_writer_new(
+		SERD_TURTLE, (SerdStyle)0, env, NULL, serd_file_sink, empty);
+
+	// FIXME: error handling
+	serd_writer_write_statement(writer, 0, NULL,
+	                            &s, &p, &nothing, NULL, NULL);
+
+	assert((size_t)ftell(empty) == strlen("<>\n\t<http://example.org/pred> "));
+
+	serd_writer_free(writer);
+	fclose(empty);
+
 	serd_env_free(env);
 	fclose(fd);
 }

wscript

@@ -63,7 +63,6 @@ def configure(conf):
                 '-Wno-padded',
                 '-Wno-reserved-id-macro',
                 '-Wno-sign-conversion',
-                '-Wno-switch-enum',
             ],
             'gcc': [
                 '-Wno-cast-align',
@@ -74,7 +73,6 @@ def configure(conf):
                 '-Wno-sign-conversion',
                 '-Wno-suggest-attribute=const',
                 '-Wno-suggest-attribute=pure',
-                '-Wno-switch-enum',
             ],
             'msvc': [
                 '/wd4061',  # enumerator in switch is not explicitly handled