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LibJS: Report string length as the code point length, not byte length

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For example, U+180E is 3 bytes, but should have a string length of 1.
This commit is contained in:
Timothy Flynn 2021-07-16 13:04:46 -04:00 • committed by Linus Groh
parent 87848cdf7d
commit a2e734d202
2 changed files with 9 additions and 1 deletions
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3
Userland/Libraries/LibJS/Runtime/StringObject.cpp
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@ -5,6 +5,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Utf8View.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/PrimitiveString.h>
@ -33,7 +34,7 @@ void StringObject::initialize(GlobalObject& global_object)
{
auto& vm = this->vm();
Object::initialize(global_object);
define_direct_property(vm.names.length, Value(m_string.string().length()), 0);
define_direct_property(vm.names.length, Value(Utf8View(m_string.string()).length()), 0);
}
void StringObject::visit_edges(Cell::Visitor& visitor)

7
Userland/Libraries/LibJS/Tests/builtins/String/String.js
View file

@ -7,3 +7,10 @@ test("typeof", () => {
expect(typeof String()).toBe("string");
expect(typeof new String()).toBe("object");
});
test("length", () => {
expect(new String().length).toBe(0);
expect(new String("a").length).toBe(1);
expect(new String("\u180E").length).toBe(1);
expect(new String("\uDBFF\uDFFF").length).toBe(2);
});