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LibJS: Add %TypedArray%.prototype.subarray
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f98a98506f
Notes:
sideshowbarker
2024-07-18 09:59:59 +09:00
Author: https://github.com/IdanHo Commit: https://github.com/SerenityOS/serenity/commit/f98a98506fe Pull-request: https://github.com/SerenityOS/serenity/pull/8582 Reviewed-by: https://github.com/linusg ✅
@ -303,6 +303,7 @@ namespace JS {
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P(strike) \
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P(strike) \
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P(stringify) \
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P(stringify) \
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P(sub) \
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P(sub) \
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P(subarray) \
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P(substr) \
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P(substr) \
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P(substring) \
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P(substring) \
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P(sup) \
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P(sup) \
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@ -46,6 +46,7 @@ void TypedArrayPrototype::initialize(GlobalObject& object)
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define_native_function(vm.names.entries, entries, 0, attr);
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define_native_function(vm.names.entries, entries, 0, attr);
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define_native_function(vm.names.set, set, 1, attr);
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define_native_function(vm.names.set, set, 1, attr);
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define_native_function(vm.names.slice, slice, 2, attr);
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define_native_function(vm.names.slice, slice, 2, attr);
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define_native_function(vm.names.subarray, subarray, 2, attr);
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define_native_function(vm.names.reverse, reverse, 0, attr);
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define_native_function(vm.names.reverse, reverse, 0, attr);
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define_native_function(vm.names.copyWithin, copy_within, 2, attr);
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define_native_function(vm.names.copyWithin, copy_within, 2, attr);
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define_native_function(vm.names.filter, filter, 1, attr);
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define_native_function(vm.names.filter, filter, 1, attr);
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@ -907,6 +908,61 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::slice)
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return new_array;
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return new_array;
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}
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}
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// 23.2.3.27 %TypedArray%.prototype.subarray ( begin, end ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.subarray
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JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::subarray)
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{
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auto* typed_array = typed_array_from(global_object);
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if (!typed_array)
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return {};
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auto length = typed_array->array_length();
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auto relative_begin = vm.argument(0).to_integer_or_infinity(global_object);
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if (vm.exception())
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return {};
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i32 begin_index;
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if (Value(relative_begin).is_negative_infinity())
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begin_index = 0;
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else if (relative_begin < 0)
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begin_index = max(length + relative_begin, 0);
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else
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begin_index = min(relative_begin, length);
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double relative_end;
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if (vm.argument(1).is_undefined()) {
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relative_end = length;
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} else {
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relative_end = vm.argument(1).to_integer_or_infinity(global_object);
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if (vm.exception())
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return {};
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}
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i32 end_index;
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if (Value(relative_end).is_negative_infinity())
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end_index = 0;
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else if (relative_end < 0)
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end_index = max(length + relative_end, 0);
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else
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end_index = min(relative_end, length);
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auto new_length = max(end_index - begin_index, 0);
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Checked<u32> begin_byte_offset = begin_index;
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begin_byte_offset *= typed_array->element_size();
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begin_byte_offset += typed_array->byte_offset();
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if (begin_byte_offset.has_overflow()) {
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dbgln("TypedArrayPrototype::begin_byte_offset: limit overflowed, returning as if succeeded.");
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return typed_array;
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}
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MarkedValueList arguments(vm.heap());
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arguments.empend(typed_array->viewed_array_buffer());
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arguments.empend(begin_byte_offset.value());
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arguments.empend(new_length);
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return typed_array_species_create(global_object, *typed_array, move(arguments));
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}
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// 23.2.3.22 %TypedArray%.prototype.reverse ( ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.reverse
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// 23.2.3.22 %TypedArray%.prototype.reverse ( ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.reverse
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JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::reverse)
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JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::reverse)
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{
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{
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@ -43,6 +43,7 @@ private:
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JS_DECLARE_NATIVE_FUNCTION(entries);
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JS_DECLARE_NATIVE_FUNCTION(entries);
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JS_DECLARE_NATIVE_FUNCTION(set);
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JS_DECLARE_NATIVE_FUNCTION(set);
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JS_DECLARE_NATIVE_FUNCTION(slice);
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JS_DECLARE_NATIVE_FUNCTION(slice);
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JS_DECLARE_NATIVE_FUNCTION(subarray);
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JS_DECLARE_NATIVE_FUNCTION(reverse);
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JS_DECLARE_NATIVE_FUNCTION(reverse);
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JS_DECLARE_NATIVE_FUNCTION(copy_within);
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JS_DECLARE_NATIVE_FUNCTION(copy_within);
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JS_DECLARE_NATIVE_FUNCTION(filter);
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JS_DECLARE_NATIVE_FUNCTION(filter);
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@ -0,0 +1,45 @@
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const TYPED_ARRAYS = [
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Uint8Array,
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Uint8ClampedArray,
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Uint16Array,
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Uint32Array,
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Int8Array,
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Int16Array,
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Int32Array,
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Float32Array,
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Float64Array,
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];
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const BIGINT_TYPED_ARRAYS = [BigUint64Array, BigInt64Array];
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test("basic functionality", () => {
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TYPED_ARRAYS.forEach(T => {
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expect(T.prototype.subarray).toHaveLength(2);
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const typedArray = new T(3);
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typedArray[0] = 1;
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typedArray[1] = 2;
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typedArray[2] = 3;
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const subarray = typedArray.subarray(1, 2);
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expect(subarray).toHaveLength(1);
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expect(subarray[0]).toBe(2);
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subarray[0] = 4;
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expect(typedArray[1]).toBe(4);
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});
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BIGINT_TYPED_ARRAYS.forEach(T => {
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expect(T.prototype.subarray).toHaveLength(2);
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const typedArray = new T(3);
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typedArray[0] = 1n;
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typedArray[1] = 2n;
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typedArray[2] = 3n;
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const subarray = typedArray.subarray(1, 2);
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expect(subarray).toHaveLength(1);
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expect(subarray[0]).toBe(2n);
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subarray[0] = 4n;
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expect(typedArray[1]).toBe(4n);
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});
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});
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