1 files changed, 15 insertions, 0 deletions
diff --git a/src/core/config.h b/src/core/config.h
index 389a146..63b131b 100644
--- a/src/core/config.h
+++ b/src/core/config.h
@@ -5,11 +5,26 @@
 // not opaque) type which the consumer of the core library is supposed to
 // assemble themselves. It contains hooks which the State will use for all effects.
 
+#include "location.h"
+
+#include <stddef.h>
+
 // This handler is used for output from the user-supplied actual program.
 typedef void (* SandPrintHandler)(const char *message, size_t length);
 
+typedef enum {
+	SAND_DIAGNOSTIC_INFO,
+	SAND_DIAGNOSTIC_WARNING,
+	SAND_DIAGNOSTIC_ERROR,
+} SandDiagnosticLevel;
+
+// This handler is used when the implementation has a report to make.
+// These could for example be displayed in tan editor's interface.
+typedef void (* SandDiagnosticHandler)(const SandLocation *, SandDiagnosticLevel, const char *message, size_t message_length);
+
 typedef struct {
 	SandPrintHandler print_handler;
+	SandDiagnosticHandler diagnostic_handler;
 } SandConfig;
 
 #endif