quickjs-tart

commit 47466258e34604cffdac2b5f9d8926f90d4adeef
parent 9c032fc272f2f01b5534ebc39fb67387e02d20c8
Author: Tyler Rockwood <rockwotj@gmail.com>
Date:   Tue, 20 Feb 2024 09:29:08 +0100

Add C API function JS_GetClassID()

If you want to extend a built-in class you need it's class ID and there
is no robust way to get that without this accessor.

* add JS_INVALID_CLASS_ID constant for invalid class ID.

Signed-off-by: Tyler Rockwood <rockwood@redpanda.com>

Diffstat:
M
quickjs/quickjs.c
 | 
9
+++++++++
M
quickjs/quickjs.h
 | 
3
+++

2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/quickjs/quickjs.c b/quickjs/quickjs.c
@@ -3395,6 +3395,15 @@ JSClassID JS_NewClassID(JSClassID *pclass_id)
     return class_id;
 }
 
+JSClassID JS_GetClassID(JSValue v)
+{
+    JSObject *p;
+    if (JS_VALUE_GET_TAG(v) != JS_TAG_OBJECT)
+        return JS_INVALID_CLASS_ID;
+    p = JS_VALUE_GET_OBJ(v);
+    return p->class_id;
+}
+
 BOOL JS_IsRegisteredClass(JSRuntime *rt, JSClassID class_id)
 {
     return (class_id < rt->class_count &&
diff --git a/quickjs/quickjs.h b/quickjs/quickjs.h
@@ -499,7 +499,10 @@ typedef struct JSClassDef {
     JSClassExoticMethods *exotic;
 } JSClassDef;
 
+#define JS_INVALID_CLASS_ID 0
 JSClassID JS_NewClassID(JSClassID *pclass_id);
+/* Returns the class ID if `v` is an object, otherwise returns JS_INVALID_CLASS_ID. */
+JSClassID JS_GetClassID(JSValue v);
 int JS_NewClass(JSRuntime *rt, JSClassID class_id, const JSClassDef *class_def);
 int JS_IsRegisteredClass(JSRuntime *rt, JSClassID class_id);