Add debugging macros

Similarly to what GTK+ and Clutter do, we can use macros that evaluate
to nothing if JSON_ENABLE_DEBUG is disabled; they evaluate to messages
when the JSON_DEBUG environment variable is set to a debug domain.

1 files changed, 37 insertions, 0 deletions

diff --git a/json-glib/json-debug.c b/json-glib/json-debug.c
new file mode 100644
index 0000000..471d082
--- /dev/null
+++ b/json-glib/json-debug.c
@@ -0,0 +1,37 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "json-debug.h"
+
+static unsigned int json_debug_flags     = 0;
+static gboolean     json_debug_flags_set = FALSE;
+
+#ifdef JSON_ENABLE_DEBUG
+static const GDebugKey json_debug_keys[] = {
+  { "parser", JSON_DEBUG_PARSER }
+};
+#endif /* JSON_ENABLE_DEBUG */
+
+JsonDebugFlags
+_json_get_debug_flags (void)
+{
+#ifdef JSON_ENABLE_DEBUG
+  const gchar *env_str;
+
+  if (json_debug_flags_set)
+    return json_debug_flags;
+
+  env_str = g_getenv ("JSON_DEBUG");
+  if (env_str != NULL && *env_str != '\0')
+    {
+      json_debug_flags |= g_parse_debug_string (env_str,
+                                                json_debug_keys,
+                                                G_N_ELEMENTS (json_debug_keys));
+    }
+
+  json_debug_flags_set = TRUE;
+#endif /* JSON_ENABLE_DEBUG */
+
+  return json_debug_flags;
+}