1 files changed, 96 insertions, 0 deletions
diff --git a/src/nvim/api/private/validate.h b/src/nvim/api/private/validate.h
new file mode 100644
index 0000000000..d1c977cd6e
--- /dev/null
+++ b/src/nvim/api/private/validate.h
@@ -0,0 +1,96 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stddef.h>
+
+#include "nvim/api/private/defs.h"
+#include "nvim/api/private/helpers.h"
+#include "nvim/assert_defs.h"
+#include "nvim/macros_defs.h"
+
+#define VALIDATE(cond, fmt_, fmt_arg1, code) \
+  do { \
+    if (!(cond)) { \
+      api_set_error(err, kErrorTypeValidation, fmt_, fmt_arg1); \
+      code; \
+    } \
+  } while (0)
+
+#define VALIDATE_INT(cond, name, val_, code) \
+  do { \
+    if (!(cond)) { \
+      api_err_invalid(err, name, NULL, val_, false); \
+      code; \
+    } \
+  } while (0)
+
+#define VALIDATE_S(cond, name, val_, code) \
+  do { \
+    if (!(cond)) { \
+      api_err_invalid(err, name, val_, 0, true); \
+      code; \
+    } \
+  } while (0)
+
+#define VALIDATE_EXP(cond, name, expected, actual, code) \
+  do { \
+    if (!(cond)) { \
+      api_err_exp(err, name, expected, actual); \
+      code; \
+    } \
+  } while (0)
+
+#define VALIDATE_T(name, expected_t, actual_t, code) \
+  do { \
+    STATIC_ASSERT(expected_t != kObjectTypeDictionary, "use VALIDATE_T_DICT"); \
+    if (expected_t != actual_t) { \
+      api_err_exp(err, name, api_typename(expected_t), api_typename(actual_t)); \
+      code; \
+    } \
+  } while (0)
+
+/// Checks that `obj_` has type `expected_t`.
+#define VALIDATE_T2(obj_, expected_t, code) \
+  do { \
+    STATIC_ASSERT(expected_t != kObjectTypeDictionary, "use VALIDATE_T_DICT"); \
+    if ((obj_).type != expected_t) { \
+      api_err_exp(err, STR(obj_), api_typename(expected_t), api_typename((obj_).type)); \
+      code; \
+    } \
+  } while (0)
+
+/// Checks that `obj_` has Dict type. Also allows empty Array in a Lua context.
+#define VALIDATE_T_DICT(name, obj_, code) \
+  do { \
+    if ((obj_).type != kObjectTypeDictionary \
+        && !(channel_id == LUA_INTERNAL_CALL \
+             && (obj_).type == kObjectTypeArray \
+             && (obj_).data.array.size == 0)) { \
+      api_err_exp(err, name, api_typename(kObjectTypeDictionary), api_typename((obj_).type)); \
+      code; \
+    } \
+  } while (0)
+
+/// Checks that actual_t is either the correct handle type or a type erased handle (integer)
+#define VALIDATE_T_HANDLE(name, expected_t, actual_t, code) \
+  do { \
+    if (expected_t != actual_t && kObjectTypeInteger != actual_t) { \
+      api_err_exp(err, name, api_typename(expected_t), api_typename(actual_t)); \
+      code; \
+    } \
+  } while (0)
+
+#define VALIDATE_RANGE(cond, name, code) \
+  do { \
+    if (!(cond)) { \
+      api_err_invalid(err, name, "out of range", 0, false); \
+      code; \
+    } \
+  } while (0)
+
+#define VALIDATE_R(cond, name, code) \
+  VALIDATE(cond, "Required: '%s'", name, code);
+
+#ifdef INCLUDE_GENERATED_DECLARATIONS
+# include "api/private/validate.h.generated.h"
+#endif