[node] Add HOLDS macros for quick type checking

JsonNode should mimick GValue's API and have macros for easy type checking

2 files changed, 52 insertions, 1 deletions

diff --git a/json-glib/json-types.h b/json-glib/json-types.h
index 3ea885f..5793179 100644
--- a/json-glib/json-types.h
+++ b/json-glib/json-types.h
@@ -40,6 +40,57 @@ G_BEGIN_DECLS
  */
 #define JSON_NODE_TYPE(node)    (json_node_get_node_type ((node)))
 
+/**
+ * JSON_NODE_HOLDS:
+ * @node: a #JsonNode
+ * @t: a #JsonNodeType
+ *
+ * Evaluates to %TRUE if the @node holds type @t
+ *
+ * Since: 0.10
+ */
+#define JSON_NODE_HOLDS(node,t)         (json_node_get_node_type ((node)) == (t))
+
+/**
+ * JSON_NODE_HOLDS_VALUE:
+ * @node: a #JsonNode
+ *
+ * Evaluates to %TRUE if @node holds a %JSON_NODE_VALUE
+ *
+ * Since: 0.10
+ */
+#define JSON_NODE_HOLDS_VALUE(node)     (JSON_NODE_HOLDS ((node), JSON_NODE_VALUE))
+
+/**
+ * JSON_NODE_HOLDS_OBJECT:
+ * @node: a #JsonNode
+ *
+ * Evaluates to %TRUE if @node holds a %JSON_NODE_OBJECT
+ *
+ * Since: 0.10
+ */
+#define JSON_NODE_HOLDS_OBJECT(node)    (JSON_NODE_HOLDS ((node), JSON_NODE_OBJECT))
+
+/**
+ * JSON_NODE_HOLDS_ARRAY:
+ * @node: a #JsonNode
+ *
+ * Evaluates to %TRUE if @node holds a %JSON_NODE_ARRAY
+ *
+ * Since: 0.10
+ */
+#define JSON_NODE_HOLDS_ARRAY(node)     (JSON_NODE_HOLDS ((node), JSON_NODE_ARRAY))
+
+/**
+ * JSON_NODE_HOLDS_NULL:
+ * @node: a #JsonNode
+ *
+ * Evaluates to %TRUE if @node holds a %JSON_NODE_NULL
+ *
+ * Since: 0.10
+ */
+#define JSON_NODE_HOLDS_NULL(node)      (JSON_NODE_HOLDS ((node), JSON_NODE_NULL))
+
 #define JSON_TYPE_NODE          (json_node_get_type ())
 #define JSON_TYPE_OBJECT        (json_object_get_type ())
 #define JSON_TYPE_ARRAY         (json_array_get_type ())
diff --git a/json-glib/tests/node-test.c b/json-glib/tests/node-test.c
index 7c0336d..da979a4 100644
--- a/json-glib/tests/node-test.c
+++ b/json-glib/tests/node-test.c
@@ -60,7 +60,7 @@ test_null (void)
 {
   JsonNode *node = json_node_new (JSON_NODE_NULL);
 
-  g_assert_cmpint (json_node_get_node_type (node), ==, JSON_NODE_NULL);
+  g_assert (JSON_NODE_HOLDS_NULL (node));
   g_assert_cmpint (json_node_get_value_type (node), ==, G_TYPE_INVALID);
   g_assert_cmpstr (json_node_type_name (node), ==, "NULL");