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LibJS: Add Array::create_from() for generic Vector<T>

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It relies on a mapper function to convert each T& to a JS::Value. This
allows us to avoid awkward Vector<T> to MarkedValueList conversion at
the call site.
This commit is contained in:
Linus Groh 2021-09-04 17:07:46 +01:00
parent e7e2ccc04c
commit 8f3a5ba5d8
1 changed files with 17 additions and 0 deletions
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17
Userland/Libraries/LibJS/Runtime/Array.h
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@ -6,6 +6,10 @@
#pragma once
#include <AK/Assertions.h>
#include <AK/Function.h>
#include <AK/Vector.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Object.h>
namespace JS {
@ -16,6 +20,19 @@ class Array : public Object {
public:
static Array* create(GlobalObject&, size_t length, Object* prototype = nullptr);
static Array* create_from(GlobalObject&, Vector<Value> const&);
// Non-standard but equivalent to CreateArrayFromList.
template<typename T>
static Array* create_from(GlobalObject& global_object, Vector<T>& elements, Function<Value(T&)> map_fn)
{
auto& vm = global_object.vm();
auto values = MarkedValueList { global_object.heap() };
values.ensure_capacity(elements.size());
for (auto& element : elements) {
values.append(map_fn(element));
VERIFY(!vm.exception());
}
return Array::create_from(global_object, values);
}
explicit Array(Object& prototype);
virtual ~Array() override;