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LibJS: Rewrite String.raw() closer to the specification

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This includes not throwing a custom exception and using the
length_of_array_like abstract operation where required.
This commit is contained in:
Idan Horowitz 2021-06-28 13:14:41 +03:00 • committed by Linus Groh
parent d1ffeaf66d
commit 596324ae9c
3 changed files with 29 additions and 20 deletions
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46
Userland/Libraries/LibJS/Runtime/StringConstructor.cpp
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@ -6,6 +6,7 @@
#include <AK/StringBuilder.h>
#include <AK/Utf32View.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
@ -68,41 +69,50 @@ Value StringConstructor::construct(FunctionObject&)
// 22.1.2.4 String.raw ( template, ...substitutions ), https://tc39.es/ecma262/#sec-string.raw
JS_DEFINE_NATIVE_FUNCTION(StringConstructor::raw)
{
auto* template_object = vm.argument(0).to_object(global_object);
auto* cooked = vm.argument(0).to_object(global_object);
if (vm.exception())
return {};
auto raw = template_object->get(vm.names.raw);
auto raw_value = cooked->get(vm.names.raw).value_or(js_undefined());
if (vm.exception())
return {};
if (raw.is_empty() || raw.is_nullish()) {
vm.throw_exception<TypeError>(global_object, ErrorType::StringRawCannotConvert, raw.is_null() ? "null" : "undefined");
auto* raw = raw_value.to_object(global_object);
if (vm.exception())
return {};
}
// FIXME: This should use length_of_array_like() and work with any object
if (!raw.is_object() || !raw.as_object().is_array())
auto literal_segments = length_of_array_like(global_object, *raw);
if (vm.exception())
return {};
if (literal_segments == 0)
return js_string(vm, "");
auto* array = static_cast<Array*>(raw.to_object(global_object));
auto& raw_array_elements = array->indexed_properties();
StringBuilder builder;
const auto number_of_substituions = vm.argument_count() - 1;
for (size_t i = 0; i < raw_array_elements.array_like_size(); ++i) {
auto result = raw_array_elements.get(array, i);
StringBuilder builder;
for (size_t i = 0; i < literal_segments; ++i) {
auto next_key = String::number(i);
auto next_segment_value = raw->get(next_key).value_or(js_undefined());
if (vm.exception())
return {};
if (!result.has_value())
continue;
builder.append(result.value().value.to_string(global_object));
auto next_segment = next_segment_value.to_string(global_object);
if (vm.exception())
return {};
if (i + 1 < vm.argument_count() && i < raw_array_elements.array_like_size() - 1) {
builder.append(vm.argument(i + 1).to_string(global_object));
builder.append(next_segment);
if (i + 1 == literal_segments)
break;
if (i < number_of_substituions) {
auto next = vm.argument(i + 1);
auto next_sub = next.to_string(global_object);
if (vm.exception())
return {};
builder.append(next_sub);
}
}
return js_string(vm, builder.build());
}