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// Copyright 2018 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-segmenter.h"
#include <map>
#include <memory>
#include <string>
#include "src/heap/factory.h"
#include "src/isolate.h"
#include "src/objects-inl.h"
#include "src/objects/intl-objects.h"
#include "src/objects/js-segmenter-inl.h"
#include "src/objects/managed.h"
#include "unicode/brkiter.h"
namespace v8 {
namespace internal {
JSSegmenter::LineBreakStyle JSSegmenter::GetLineBreakStyle(const char* str) {
if (strcmp(str, "strict") == 0) return JSSegmenter::LineBreakStyle::STRICT;
if (strcmp(str, "normal") == 0) return JSSegmenter::LineBreakStyle::NORMAL;
if (strcmp(str, "loose") == 0) return JSSegmenter::LineBreakStyle::LOOSE;
UNREACHABLE();
}
JSSegmenter::Granularity JSSegmenter::GetGranularity(const char* str) {
if (strcmp(str, "grapheme") == 0) return JSSegmenter::Granularity::GRAPHEME;
if (strcmp(str, "word") == 0) return JSSegmenter::Granularity::WORD;
if (strcmp(str, "sentence") == 0) return JSSegmenter::Granularity::SENTENCE;
if (strcmp(str, "line") == 0) return JSSegmenter::Granularity::LINE;
UNREACHABLE();
}
MaybeHandle<JSSegmenter> JSSegmenter::Initialize(
Isolate* isolate, Handle<JSSegmenter> segmenter_holder,
Handle<Object> input_locales, Handle<Object> input_options) {
Factory* factory = isolate->factory();
segmenter_holder->set_flags(0);
// 3. Let requestedLocales be ? CanonicalizeLocaleList(locales).
Handle<JSObject> requested_locales;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, requested_locales,
Intl::CanonicalizeLocaleListJS(isolate, input_locales), JSSegmenter);
// 11. If options is undefined, then
Handle<JSReceiver> options;
if (input_options->IsUndefined(isolate)) {
// a. Let options be ObjectCreate(null).
options = isolate->factory()->NewJSObjectWithNullProto();
// 12. Else
} else {
// a. Let options be ? ToObject(options).
ASSIGN_RETURN_ON_EXCEPTION(isolate, options,
Object::ToObject(isolate, input_options),
JSSegmenter);
}
// 8. Set opt.[[lb]] to lineBreakStyle.
// Because currently we access localeMatcher inside ResolveLocale, we have to
// move ResolveLocale before get lineBreakStyle
// 9. Let r be ResolveLocale(%Segmenter%.[[AvailableLocales]],
// requestedLocales, opt, %Segmenter%.[[RelevantExtensionKeys]]).
Handle<JSObject> r;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, r,
Intl::ResolveLocale(isolate, "segmenter", requested_locales, options),
JSSegmenter);
Handle<Object> locale_obj =
JSObject::GetDataProperty(r, factory->locale_string());
Handle<String> locale;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, locale, Object::ToString(isolate, locale_obj), JSSegmenter);
// 7. Let lineBreakStyle be ? GetOption(options, "lineBreakStyle", "string", «
// "strict", "normal", "loose" », "normal").
std::unique_ptr<char[]> line_break_style_str = nullptr;
const std::vector<const char*> line_break_style_values = {"strict", "normal",
"loose"};
Maybe<bool> maybe_found_line_break_style = Intl::GetStringOption(
isolate, options, "lineBreakStyle", line_break_style_values,
"Intl.Segmenter", &line_break_style_str);
LineBreakStyle line_break_style_enum = LineBreakStyle::NORMAL;
MAYBE_RETURN(maybe_found_line_break_style, MaybeHandle<JSSegmenter>());
if (maybe_found_line_break_style.FromJust()) {
DCHECK_NOT_NULL(line_break_style_str.get());
line_break_style_enum = GetLineBreakStyle(line_break_style_str.get());
}
// 10. Set segmenter.[[Locale]] to the value of r.[[Locale]].
segmenter_holder->set_locale(*locale);
// 13. Let granularity be ? GetOption(options, "granularity", "string", «
// "grapheme", "word", "sentence", "line" », "grapheme").
std::unique_ptr<char[]> granularity_str = nullptr;
const std::vector<const char*> granularity_values = {"grapheme", "word",
"sentence", "line"};
Maybe<bool> maybe_found_granularity =
Intl::GetStringOption(isolate, options, "granularity", granularity_values,
"Intl.Segmenter", &granularity_str);
Granularity granularity_enum = Granularity::GRAPHEME;
MAYBE_RETURN(maybe_found_granularity, MaybeHandle<JSSegmenter>());
if (maybe_found_granularity.FromJust()) {
DCHECK_NOT_NULL(granularity_str.get());
granularity_enum = GetGranularity(granularity_str.get());
}
// 14. Set segmenter.[[SegmenterGranularity]] to granularity.
segmenter_holder->set_granularity(granularity_enum);
// 15. If granularity is "line",
if (granularity_enum == Granularity::LINE) {
// a. Set segmenter.[[SegmenterLineBreakStyle]] to r.[[lb]].
segmenter_holder->set_line_break_style(line_break_style_enum);
} else {
segmenter_holder->set_line_break_style(LineBreakStyle::NOTSET);
}
icu::Locale icu_locale = Intl::CreateICULocale(isolate, locale);
DCHECK(!icu_locale.isBogus());
UErrorCode status = U_ZERO_ERROR;
std::unique_ptr<icu::BreakIterator> icu_break_iterator;
switch (granularity_enum) {
case Granularity::GRAPHEME:
icu_break_iterator.reset(
icu::BreakIterator::createCharacterInstance(icu_locale, status));
break;
case Granularity::WORD:
icu_break_iterator.reset(
icu::BreakIterator::createWordInstance(icu_locale, status));
break;
case Granularity::SENTENCE:
icu_break_iterator.reset(
icu::BreakIterator::createSentenceInstance(icu_locale, status));
break;
case Granularity::LINE:
icu_break_iterator.reset(
icu::BreakIterator::createLineInstance(icu_locale, status));
// 15. If granularity is "line",
// a. Set segmenter.[[SegmenterLineBreakStyle]] to r.[[lb]].
// TBW
break;
case Granularity::COUNT:
UNREACHABLE();
}
CHECK(U_SUCCESS(status));
CHECK_NOT_NULL(icu_break_iterator.get());
Handle<Managed<icu::BreakIterator>> managed_break_iterator =
Managed<icu::BreakIterator>::FromUniquePtr(isolate, 0,
std::move(icu_break_iterator));
segmenter_holder->set_icu_break_iterator(*managed_break_iterator);
return segmenter_holder;
}
Handle<JSObject> JSSegmenter::ResolvedOptions(
Isolate* isolate, Handle<JSSegmenter> segmenter_holder) {
Factory* factory = isolate->factory();
Handle<JSObject> result = factory->NewJSObject(isolate->object_function());
Handle<String> locale(segmenter_holder->locale(), isolate);
JSObject::AddProperty(isolate, result, factory->locale_string(), locale,
NONE);
if (segmenter_holder->line_break_style() != LineBreakStyle::NOTSET) {
JSObject::AddProperty(isolate, result, factory->lineBreakStyle_string(),
segmenter_holder->LineBreakStyleAsString(), NONE);
}
JSObject::AddProperty(isolate, result, factory->granularity_string(),
segmenter_holder->GranularityAsString(), NONE);
return result;
}
Handle<String> JSSegmenter::LineBreakStyleAsString() const {
switch (line_break_style()) {
case LineBreakStyle::STRICT:
return GetReadOnlyRoots().strict_string_handle();
case LineBreakStyle::NORMAL:
return GetReadOnlyRoots().normal_string_handle();
case LineBreakStyle::LOOSE:
return GetReadOnlyRoots().loose_string_handle();
case LineBreakStyle::COUNT:
case LineBreakStyle::NOTSET:
UNREACHABLE();
}
}
Handle<String> JSSegmenter::GranularityAsString() const {
switch (granularity()) {
case Granularity::GRAPHEME:
return GetReadOnlyRoots().grapheme_string_handle();
case Granularity::WORD:
return GetReadOnlyRoots().word_string_handle();
case Granularity::SENTENCE:
return GetReadOnlyRoots().sentence_string_handle();
case Granularity::LINE:
return GetReadOnlyRoots().line_string_handle();
case Granularity::COUNT:
UNREACHABLE();
}
}
} // namespace internal
} // namespace v8
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