| // Copyright 2020 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_INTL_SUPPORT |
| #error Internationalization is expected to be enabled. |
| #endif // V8_INTL_SUPPORT |
| |
| #include "src/objects/js-segments.h" |
| |
| #include <map> |
| #include <memory> |
| #include <string> |
| |
| #include "src/execution/isolate.h" |
| #include "src/heap/factory.h" |
| #include "src/objects/intl-objects.h" |
| #include "src/objects/js-segment-iterator-inl.h" |
| #include "src/objects/js-segmenter-inl.h" |
| #include "src/objects/js-segments-inl.h" |
| #include "src/objects/managed-inl.h" |
| #include "src/objects/objects-inl.h" |
| #include "unicode/brkiter.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // ecma402 #sec-createsegmentsobject |
| MaybeHandle<JSSegments> JSSegments::Create(Isolate* isolate, |
| Handle<JSSegmenter> segmenter, |
| Handle<String> string) { |
| icu::BreakIterator* break_iterator = |
| segmenter->icu_break_iterator()->raw()->clone(); |
| DCHECK_NOT_NULL(break_iterator); |
| |
| Handle<Managed<icu::UnicodeString>> unicode_string = |
| Intl::SetTextToBreakIterator(isolate, string, break_iterator); |
| Handle<Managed<icu::BreakIterator>> managed_break_iterator = |
| Managed<icu::BreakIterator>::FromRawPtr(isolate, 0, break_iterator); |
| |
| // 1. Let internalSlotsList be « [[SegmentsSegmenter]], [[SegmentsString]] ». |
| // 2. Let segments be ! ObjectCreate(%Segments.prototype%, internalSlotsList). |
| Handle<Map> map(isolate->native_context()->intl_segments_map(), isolate); |
| Handle<JSObject> result = isolate->factory()->NewJSObjectFromMap(map); |
| |
| Handle<JSSegments> segments = Handle<JSSegments>::cast(result); |
| segments->set_flags(0); |
| |
| // 3. Set segments.[[SegmentsSegmenter]] to segmenter. |
| segments->set_icu_break_iterator(*managed_break_iterator); |
| segments->set_granularity(segmenter->granularity()); |
| |
| // 4. Set segments.[[SegmentsString]] to string. |
| segments->set_raw_string(*string); |
| segments->set_unicode_string(*unicode_string); |
| |
| // 5. Return segments. |
| return segments; |
| } |
| |
| // ecma402 #sec-%segmentsprototype%.containing |
| MaybeHandle<Object> JSSegments::Containing(Isolate* isolate, |
| Handle<JSSegments> segments, |
| double n_double) { |
| // 5. Let len be the length of string. |
| int32_t len = segments->unicode_string()->raw()->length(); |
| |
| // 7. If n < 0 or n ≥ len, return undefined. |
| if (n_double < 0 || n_double >= len) { |
| return isolate->factory()->undefined_value(); |
| } |
| |
| int32_t n = static_cast<int32_t>(n_double); |
| // n may point to the surrogate tail- adjust it back to the lead. |
| n = segments->unicode_string()->raw()->getChar32Start(n); |
| |
| icu::BreakIterator* break_iterator = segments->icu_break_iterator()->raw(); |
| // 8. Let startIndex be ! FindBoundary(segmenter, string, n, before). |
| int32_t start_index = |
| break_iterator->isBoundary(n) ? n : break_iterator->preceding(n); |
| |
| // 9. Let endIndex be ! FindBoundary(segmenter, string, n, after). |
| int32_t end_index = break_iterator->following(n); |
| |
| // 10. Return ! CreateSegmentDataObject(segmenter, string, startIndex, |
| // endIndex). |
| return CreateSegmentDataObject( |
| isolate, segments->granularity(), break_iterator, |
| handle(segments->raw_string(), isolate), |
| *(segments->unicode_string()->raw()), start_index, end_index); |
| } |
| |
| namespace { |
| |
| bool CurrentSegmentIsWordLike(icu::BreakIterator* break_iterator) { |
| int32_t rule_status = break_iterator->getRuleStatus(); |
| return (rule_status >= UBRK_WORD_NUMBER && |
| rule_status < UBRK_WORD_NUMBER_LIMIT) || |
| (rule_status >= UBRK_WORD_LETTER && |
| rule_status < UBRK_WORD_LETTER_LIMIT) || |
| (rule_status >= UBRK_WORD_KANA && |
| rule_status < UBRK_WORD_KANA_LIMIT) || |
| (rule_status >= UBRK_WORD_IDEO && rule_status < UBRK_WORD_IDEO_LIMIT); |
| } |
| |
| } // namespace |
| |
| // ecma402 #sec-createsegmentdataobject |
| MaybeHandle<JSSegmentDataObject> JSSegments::CreateSegmentDataObject( |
| Isolate* isolate, JSSegmenter::Granularity granularity, |
| icu::BreakIterator* break_iterator, Handle<String> input_string, |
| const icu::UnicodeString& unicode_string, int32_t start_index, |
| int32_t end_index) { |
| Factory* factory = isolate->factory(); |
| |
| // 1. Let len be the length of string. |
| // 2. Assert: startIndex ≥ 0. |
| DCHECK_GE(start_index, 0); |
| // 3. Assert: endIndex ≤ len. |
| DCHECK_LE(end_index, unicode_string.length()); |
| // 4. Assert: startIndex < endIndex. |
| DCHECK_LT(start_index, end_index); |
| |
| // 5. Let result be ! ObjectCreate(%ObjectPrototype%). |
| Handle<Map> map( |
| granularity == JSSegmenter::Granularity::WORD |
| ? isolate->native_context()->intl_segment_data_object_wordlike_map() |
| : isolate->native_context()->intl_segment_data_object_map(), |
| isolate); |
| Handle<JSSegmentDataObject> result = |
| Handle<JSSegmentDataObject>::cast(factory->NewJSObjectFromMap(map)); |
| |
| // 6. Let segment be the String value equal to the substring of string |
| // consisting of the code units at indices startIndex (inclusive) through |
| // endIndex (exclusive). |
| Handle<String> segment; |
| ASSIGN_RETURN_ON_EXCEPTION( |
| isolate, segment, |
| Intl::ToString(isolate, unicode_string, start_index, end_index), |
| JSSegmentDataObject); |
| Handle<Object> index = factory->NewNumberFromInt(start_index); |
| |
| // 7. Perform ! CreateDataPropertyOrThrow(result, "segment", segment). |
| DisallowGarbageCollection no_gc; |
| Tagged<JSSegmentDataObject> raw = JSSegmentDataObject::cast(*result); |
| raw->set_segment(*segment); |
| // 8. Perform ! CreateDataPropertyOrThrow(result, "index", startIndex). |
| raw->set_index(*index); |
| // 9. Perform ! CreateDataPropertyOrThrow(result, "input", string). |
| raw->set_input(*input_string); |
| |
| // 10. Let granularity be segmenter.[[SegmenterGranularity]]. |
| // 11. If granularity is "word", then |
| if (granularity == JSSegmenter::Granularity::WORD) { |
| // a. Let isWordLike be a Boolean value indicating whether the segment in |
| // string is "word-like" according to locale segmenter.[[Locale]]. |
| Handle<Boolean> is_word_like = |
| factory->ToBoolean(CurrentSegmentIsWordLike(break_iterator)); |
| // b. Perform ! CreateDataPropertyOrThrow(result, "isWordLike", isWordLike). |
| JSSegmentDataObjectWithIsWordLike::cast(raw)->set_is_word_like( |
| *is_word_like); |
| } |
| return result; |
| } |
| |
| Handle<String> JSSegments::GranularityAsString(Isolate* isolate) const { |
| return JSSegmenter::GetGranularityString(isolate, granularity()); |
| } |
| |
| } // namespace internal |
| } // namespace v8 |