| /* |
| * Proxy built-in (ES6) |
| */ |
| |
| #include "duk_internal.h" |
| |
| #if defined(DUK_USE_ES6_PROXY) |
| DUK_INTERNAL duk_ret_t duk_bi_proxy_constructor(duk_context *ctx) { |
| duk_hobject *h_target; |
| duk_hobject *h_handler; |
| |
| if (!duk_is_constructor_call(ctx)) { |
| return DUK_RET_TYPE_ERROR; |
| } |
| |
| /* Reject a proxy object as the target because it would need |
| * special handler in property lookups. (ES6 has no such restriction) |
| */ |
| h_target = duk_require_hobject_or_lfunc_coerce(ctx, 0); |
| DUK_ASSERT(h_target != NULL); |
| if (DUK_HOBJECT_HAS_EXOTIC_PROXYOBJ(h_target)) { |
| return DUK_RET_TYPE_ERROR; |
| } |
| |
| /* Reject a proxy object as the handler because it would cause |
| * potentially unbounded recursion. (ES6 has no such restriction) |
| */ |
| h_handler = duk_require_hobject_or_lfunc_coerce(ctx, 1); |
| DUK_ASSERT(h_handler != NULL); |
| if (DUK_HOBJECT_HAS_EXOTIC_PROXYOBJ(h_handler)) { |
| return DUK_RET_TYPE_ERROR; |
| } |
| |
| /* XXX: the returned value is exotic in ES6, but we use a |
| * simple object here with no prototype. Without a prototype, |
| * [[DefaultValue]] coercion fails which is abit confusing. |
| * No callable check/handling in the current Proxy subset. |
| */ |
| (void) duk_push_object_helper_proto(ctx, |
| DUK_HOBJECT_FLAG_EXTENSIBLE | |
| DUK_HOBJECT_FLAG_EXOTIC_PROXYOBJ | |
| DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_OBJECT), |
| NULL); |
| DUK_ASSERT_TOP(ctx, 3); |
| |
| /* Make _Target and _Handler non-configurable and non-writable. |
| * They can still be forcibly changed by C code (both user and |
| * Duktape internal), but not by Ecmascript code. |
| */ |
| |
| /* Proxy target */ |
| duk_dup(ctx, 0); |
| duk_xdef_prop_stridx(ctx, -2, DUK_STRIDX_INT_TARGET, DUK_PROPDESC_FLAGS_NONE); |
| |
| /* Proxy handler */ |
| duk_dup(ctx, 1); |
| duk_xdef_prop_stridx(ctx, -2, DUK_STRIDX_INT_HANDLER, DUK_PROPDESC_FLAGS_NONE); |
| |
| return 1; /* replacement handler */ |
| } |
| #else /* DUK_USE_ES6_PROXY */ |
| DUK_INTERNAL duk_ret_t duk_bi_proxy_constructor(duk_context *ctx) { |
| DUK_UNREF(ctx); |
| return DUK_RET_UNSUPPORTED_ERROR; |
| } |
| #endif /* DUK_USE_ES6_PROXY */ |
