Add version to navigator.userAgent (#542)

A la Deno and Bun.

Author: saghul

qjs.c

@@ -137,13 +137,20 @@ static JSValue js_gc(JSContext *ctx, JSValue this_val,
     return JS_UNDEFINED;
 }
 
-static const JSCFunctionListEntry navigator_obj[] = {
-    JS_PROP_STRING_DEF("userAgent", "quickjs-ng", JS_PROP_ENUMERABLE),
+static JSValue js_navigator_get_userAgent(JSContext *ctx, JSValue this_val)
+{
+    char version[32];
+    snprintf(version, sizeof(version), "quickjs-ng/%s", JS_GetVersion());
+    return JS_NewString(ctx, version);
+}
+
+static const JSCFunctionListEntry navigator_proto_funcs[] = {
+    JS_CGETSET_DEF2("userAgent", js_navigator_get_userAgent, NULL, JS_PROP_CONFIGURABLE | JS_PROP_ENUMERABLE),
+    JS_PROP_STRING_DEF("[Symbol.toStringTag]", "Navigator", JS_PROP_CONFIGURABLE),
 };
 
 static const JSCFunctionListEntry global_obj[] = {
     JS_CFUNC_DEF("gc", 0, js_gc),
-    JS_OBJECT_DEF("navigator", navigator_obj, countof(navigator_obj), JS_PROP_C_W_E),
 #if defined(__ASAN__) || defined(__UBSAN__)
     JS_PROP_INT32_DEF("__running_with_sanitizer__", 1, JS_PROP_C_W_E ),
 #endif
@@ -164,7 +171,12 @@ static JSContext *JS_NewCustomContext(JSRuntime *rt)
     JSValue global = JS_GetGlobalObject(ctx);
     JS_SetPropertyFunctionList(ctx, global, global_obj, countof(global_obj));
     JS_SetPropertyFunctionList(ctx, global, &argv0, 1);
+    JSValue navigator_proto = JS_NewObject(ctx);
+    JS_SetPropertyFunctionList(ctx, navigator_proto, navigator_proto_funcs, countof(navigator_proto_funcs));
+    JSValue navigator = JS_NewObjectProto(ctx, navigator_proto);
+    JS_DefinePropertyValueStr(ctx, global, "navigator", navigator, JS_PROP_CONFIGURABLE | JS_PROP_ENUMERABLE);
     JS_FreeValue(ctx, global);
+    JS_FreeValue(ctx, navigator_proto);
 
     return ctx;
 }

quickjs.h

@@ -982,6 +982,7 @@ typedef struct JSCFunctionListEntry {
 #define JS_CFUNC_SPECIAL_DEF(name, length, cproto, func1) { name, JS_PROP_WRITABLE | JS_PROP_CONFIGURABLE, JS_DEF_CFUNC, 0, { .func = { length, JS_CFUNC_ ## cproto, { .cproto = func1 } } } }
 #define JS_ITERATOR_NEXT_DEF(name, length, func1, magic) { name, JS_PROP_WRITABLE | JS_PROP_CONFIGURABLE, JS_DEF_CFUNC, magic, { .func = { length, JS_CFUNC_iterator_next, { .iterator_next = func1 } } } }
 #define JS_CGETSET_DEF(name, fgetter, fsetter) { name, JS_PROP_CONFIGURABLE, JS_DEF_CGETSET, 0, { .getset = { .get = { .getter = fgetter }, .set = { .setter = fsetter } } } }
+#define JS_CGETSET_DEF2(name, fgetter, fsetter, prop_flags) { name, prop_flags, JS_DEF_CGETSET, 0, { .getset = { .get = { .getter = fgetter }, .set = { .setter = fsetter } } } }
 #define JS_CGETSET_MAGIC_DEF(name, fgetter, fsetter, magic) { name, JS_PROP_CONFIGURABLE, JS_DEF_CGETSET_MAGIC, magic, { .getset = { .get = { .getter_magic = fgetter }, .set = { .setter_magic = fsetter } } } }
 #define JS_PROP_STRING_DEF(name, cstr, prop_flags) { name, prop_flags, JS_DEF_PROP_STRING, 0, { .str = cstr } }
 #define JS_PROP_INT32_DEF(name, val, prop_flags) { name, prop_flags, JS_DEF_PROP_INT32, 0, { .i32 = val } }