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LibJS: Add Object.{isExtensible,preventExtensions}()

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Matthew Olsson 2020-06-01 21:13:16 -07:00 • committed by Andreas Kling
parent daa3f59a55
commit d5ae73a63b
6 changed files with 118 additions and 0 deletions
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20
Libraries/LibJS/Runtime/Object.cpp
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@ -89,6 +89,12 @@ bool Object::has_prototype(const Object* prototype) const
return false;
}
bool Object::prevent_extensions()
{
m_is_extensible = false;
return true;
}
Value Object::get_own_property(const Object& this_object, PropertyName property_name) const
{
Value value_here;
@ -308,6 +314,13 @@ bool Object::put_own_property(Object& this_object, const FlyString& property_nam
{
ASSERT(!(mode == PutOwnPropertyMode::Put && value.is_accessor()));
if (!is_extensible()) {
dbg() << "Disallow define_property of non-extensible object";
if (throw_exceptions && interpreter().in_strict_mode())
interpreter().throw_exception<TypeError>(String::format("Cannot define property %s on non-extensible object", property_name.characters()));
return false;
}
if (value.is_accessor()) {
auto& accessor = value.as_accessor();
if (accessor.getter())
@ -375,6 +388,13 @@ bool Object::put_own_property_by_index(Object& this_object, u32 property_index,
{
ASSERT(!(mode == PutOwnPropertyMode::Put && value.is_accessor()));
if (!is_extensible()) {
dbg() << "Disallow define_property of non-extensible object";
if (throw_exceptions && interpreter().in_strict_mode())
interpreter().throw_exception<TypeError>(String::format("Cannot define property %d on non-extensible object", property_index));
return false;
}
if (value.is_accessor()) {
auto& accessor = value.as_accessor();
if (accessor.getter())