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LibJS: Implement Intl %SegmentsPrototype%.containing
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4 changed files with 79 additions and 1 deletions
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@ -4,9 +4,9 @@
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Utf16View.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Intl/SegmentIterator.h>
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#include <LibJS/Runtime/Intl/Segments.h>
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#include <LibJS/Runtime/Intl/SegmentsPrototype.h>
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namespace JS::Intl {
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@ -25,6 +25,40 @@ void SegmentsPrototype::initialize(GlobalObject& global_object)
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u8 attr = Attribute::Writable | Attribute::Configurable;
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define_native_function(*vm.well_known_symbol_iterator(), symbol_iterator, 0, attr);
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define_native_function(vm.names.containing, containing, 1, attr);
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}
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// 18.5.2.1 %SegmentsPrototype%.containing ( index ), https://tc39.es/ecma402/#sec-%segmentsprototype%.containing
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JS_DEFINE_NATIVE_FUNCTION(SegmentsPrototype::containing)
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{
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// 1. Let segments be the this value.
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// 2. Perform ? RequireInternalSlot(segments, [[SegmentsSegmenter]]).
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auto* segments = TRY(typed_this_object(global_object));
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// 3. Let segmenter be segments.[[SegmentsSegmenter]].
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auto const& segmenter = segments->segments_segmenter();
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// 4. Let string be segments.[[SegmentsString]].
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auto string = segments->segments_string();
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// 5. Let len be the length of string.
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auto length = string.length_in_code_units();
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// 6. Let n be ? ToIntegerOrInfinity(index).
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auto n = TRY(vm.argument(0).to_integer_or_infinity(global_object));
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// 7. If n < 0 or n ≥ len, return undefined.
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if (n < 0 || n >= length)
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return js_undefined();
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// 8. Let startIndex be ! FindBoundary(segmenter, string, n, before).
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auto start_index = find_boundary(segmenter, string, n, Direction::Before, segments->boundaries_cache());
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// 9. Let endIndex be ! FindBoundary(segmenter, string, n, after).
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auto end_index = find_boundary(segmenter, string, n, Direction::After, segments->boundaries_cache());
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// 10. Return ! CreateSegmentDataObject(segmenter, string, startIndex, endIndex).
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return create_segment_data_object(global_object, segmenter, string, start_index, end_index);
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}
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// 18.5.2.2 %SegmentsPrototype% [ @@iterator ] ( ), https://tc39.es/ecma402/#sec-%segmentsprototype%-@@iterator
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@ -20,6 +20,7 @@ public:
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virtual ~SegmentsPrototype() override = default;
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private:
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JS_DECLARE_NATIVE_FUNCTION(containing);
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JS_DECLARE_NATIVE_FUNCTION(symbol_iterator);
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};
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