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109 lines
4.2 KiB
C++
109 lines
4.2 KiB
C++
/*
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* Copyright (c) 2022, Idan Horowitz <idan.horowitz@serenityos.org>
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* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
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*
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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/Segmenter.h>
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namespace JS::Intl {
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JS_DEFINE_ALLOCATOR(Segmenter);
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// 18 Segmenter Objects, https://tc39.es/ecma402/#segmenter-objects
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Segmenter::Segmenter(Object& prototype)
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: Object(ConstructWithPrototypeTag::Tag, prototype)
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{
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}
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// 18.7.1 CreateSegmentDataObject ( segmenter, string, startIndex, endIndex ), https://tc39.es/ecma402/#sec-createsegmentdataobject
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ThrowCompletionOr<NonnullGCPtr<Object>> create_segment_data_object(VM& vm, Unicode::Segmenter const& segmenter, Utf16View const& string, size_t start_index, size_t end_index)
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{
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auto& realm = *vm.current_realm();
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// 1. Let len be the length of string.
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auto length = string.length_in_code_units();
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// 2. Assert: startIndex ≥ 0.
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// NOTE: This is always true because the type is size_t.
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// 3. Assert: endIndex ≤ len.
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VERIFY(end_index <= length);
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// 4. Assert: startIndex < endIndex.
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VERIFY(start_index < end_index);
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// 5. Let result be OrdinaryObjectCreate(%Object.prototype%).
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auto result = Object::create(realm, realm.intrinsics().object_prototype());
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// 6. Let segment be the substring of string from startIndex to endIndex.
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auto segment = string.substring_view(start_index, end_index - start_index);
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// 7. Perform ! CreateDataPropertyOrThrow(result, "segment", segment).
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MUST(result->create_data_property_or_throw(vm.names.segment, PrimitiveString::create(vm, Utf16String::create(segment))));
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// 8. Perform ! CreateDataPropertyOrThrow(result, "index", 𝔽(startIndex)).
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MUST(result->create_data_property_or_throw(vm.names.index, Value(start_index)));
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// 9. Perform ! CreateDataPropertyOrThrow(result, "input", string).
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MUST(result->create_data_property_or_throw(vm.names.input, PrimitiveString::create(vm, Utf16String::create(string))));
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// 10. Let granularity be segmenter.[[SegmenterGranularity]].
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auto granularity = segmenter.segmenter_granularity();
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// 11. If granularity is "word", then
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if (granularity == Unicode::SegmenterGranularity::Word) {
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// a. Let isWordLike be a Boolean value indicating whether the segment in string is "word-like" according to locale segmenter.[[Locale]].
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auto is_word_like = segmenter.is_current_boundary_word_like();
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// b. Perform ! CreateDataPropertyOrThrow(result, "isWordLike", isWordLike).
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MUST(result->create_data_property_or_throw(vm.names.isWordLike, Value(is_word_like)));
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}
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// 12. Return result.
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return result;
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}
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// 18.8.1 FindBoundary ( segmenter, string, startIndex, direction ), https://tc39.es/ecma402/#sec-findboundary
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size_t find_boundary(Unicode::Segmenter& segmenter, Utf16View const& string, size_t start_index, Direction direction)
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{
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// 1. Let len be the length of string.
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auto length = string.length_in_code_units();
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// 2. Assert: startIndex < len.
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VERIFY(start_index < length);
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// 3. Let locale be segmenter.[[Locale]].
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// 4. Let granularity be segmenter.[[SegmenterGranularity]].
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// 5. If direction is before, then
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if (direction == Direction::Before) {
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// a. Search string for the last segmentation boundary that is preceded by at most startIndex code units from
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// the beginning, using locale locale and text element granularity granularity.
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auto boundary = segmenter.previous_boundary(start_index, Unicode::Segmenter::Inclusive::Yes);
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// b. If a boundary is found, return the count of code units in string preceding it.
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if (boundary.has_value())
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return *boundary;
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// c. Return 0.
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return 0;
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}
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// 6. Assert: direction is after.
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// 7. Search string for the first segmentation boundary that follows the code unit at index startIndex, using locale
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// locale and text element granularity granularity.
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auto boundary = segmenter.next_boundary(start_index);
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// 8. If a boundary is found, return the count of code units in string preceding it.
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if (boundary.has_value())
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return *boundary;
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// 9. Return len.
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return length;
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}
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}
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