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LibJS: Implement the CreateListFromArrayLike() abstract operation

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We already have two separate implementations of this, so let's do it
properly. The optional value type check is done by a callback function
that returns Result<void, ErrorType> - value type accepted or message
for TypeError, that is.
This commit is contained in:
Linus Groh 2021-06-09 23:27:01 +01:00
parent 5da94b30eb
commit ad7aa05cc6
3 changed files with 36 additions and 0 deletions
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32
Userland/Libraries/LibJS/Runtime/Value.cpp
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@ -7,6 +7,7 @@
#include <AK/AllOf.h>
#include <AK/FlyString.h>
#include <AK/Result.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/Utf8View.h>
@ -1418,4 +1419,35 @@ Value require_object_coercible(GlobalObject& global_object, Value value)
return value;
}
// 7.3.19 CreateListFromArrayLike, https://tc39.es/ecma262/#sec-createlistfromarraylike
MarkedValueList create_list_from_array_like(GlobalObject& global_object, Value value, AK::Function<Result<void, ErrorType>(Value)> check_value)
{
auto& vm = global_object.vm();
auto& heap = global_object.heap();
if (!value.is_object()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotAnObject, value.to_string_without_side_effects());
return MarkedValueList { heap };
}
auto& array_like = value.as_object();
auto length = length_of_array_like(global_object, array_like);
if (vm.exception())
return MarkedValueList { heap };
auto list = MarkedValueList { heap };
for (size_t i = 0; i < length; ++i) {
auto index_name = String::number(i);
auto next = array_like.get(index_name).value_or(js_undefined());
if (vm.exception())
return MarkedValueList { heap };
if (check_value) {
auto result = check_value(next);
if (result.is_error()) {
vm.throw_exception<TypeError>(global_object, result.release_error());
return MarkedValueList { heap };
}
}
list.append(next);
}
return list;
}
}