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LibJS: Implement Array length setter

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This commit is contained in:
Linus Groh 2020-04-23 00:33:13 +01:00 • committed by Andreas Kling
parent d5d3e0b4ed
commit 418092a71a
4 changed files with 74 additions and 19 deletions
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30
Libraries/LibJS/Runtime/Array.cpp
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@ -49,19 +49,37 @@ Array::~Array()
{
}
Value Array::length_getter(Interpreter& interpreter)
Array* array_from(Interpreter& interpreter)
{
auto* this_object = interpreter.this_value().to_object(interpreter.heap());
if (!this_object)
return {};
if (!this_object->is_array())
return interpreter.throw_exception<TypeError>("Not an array");
return Value(static_cast<const Array*>(this_object)->length());
if (!this_object->is_array()) {
interpreter.throw_exception<TypeError>("Not an Array");
return nullptr;
}
return static_cast<Array*>(this_object);
}
void Array::length_setter(Interpreter&, Value)
Value Array::length_getter(Interpreter& interpreter)
{
ASSERT_NOT_REACHED();
auto* array = array_from(interpreter);
if (!array)
return {};
return Value(array->length());
}
void Array::length_setter(Interpreter& interpreter, Value value)
{
auto* array = array_from(interpreter);
if (!array)
return;
auto length = value.to_number();
if (length.is_nan() || length.is_infinity() || length.as_double() < 0) {
interpreter.throw_exception<RangeError>("Invalid array length");
return;
}
array->elements().resize(length.as_double());
}
}