js-segmenter.h

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// 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_OBJECTS_JS_SEGMENTER_H_
#define V8_OBJECTS_JS_SEGMENTER_H_
 
#ifndef V8_INTL_SUPPORT
#error Internationalization is expected to be enabled.
#endif  // V8_INTL_SUPPORT
 
#include <set>
#include <string>
 
#include "src/base/bit-field.h"
#include "src/execution/isolate.h"
#include "src/heap/factory.h"
#include "src/objects/managed.h"
#include "src/objects/objects.h"
#include "unicode/uversion.h"
 
// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"
 
namespace U_ICU_NAMESPACE {
class BreakIterator;
}  // namespace U_ICU_NAMESPACE
 
namespace v8 {
namespace internal {
 
#include "torque-generated/src/objects/js-segmenter-tq.inc"
 
class JSSegmenter : public TorqueGeneratedJSSegmenter<JSSegmenter, JSObject> {
 public:
  // Creates segmenter object with properties derived from input locales and
  // options.
  V8_WARN_UNUSED_RESULT static MaybeDirectHandle<JSSegmenter> New(
      Isolate* isolate, DirectHandle<Map> map, DirectHandle<Object> locales,
      DirectHandle<Object> options);
 
  V8_WARN_UNUSED_RESULT static DirectHandle<JSObject> ResolvedOptions(
      Isolate* isolate, DirectHandle<JSSegmenter> segmenter_holder);
 
  V8_EXPORT_PRIVATE static const std::set<std::string>& GetAvailableLocales();
 
  Handle<String> GranularityAsString(Isolate* isolate) const;
 
  // Segmenter accessors.
  DECL_ACCESSORS(icu_break_iterator, Tagged<Managed<icu::BreakIterator>>)
 
  // Granularity: identifying the segmenter used.
  //
  // ecma402 #sec-segmenter-internal-slots
  enum class Granularity {
    GRAPHEME,  // for character-breaks
    WORD,      // for word-breaks
    SENTENCE   // for sentence-breaks
  };
  inline void set_granularity(Granularity granularity);
  inline Granularity granularity() const;
 
  Handle<String> static GetGranularityString(Isolate* isolate,
                                             Granularity granularity);
 
  // Bit positions in |flags|.
  DEFINE_TORQUE_GENERATED_JS_SEGMENTER_FLAGS()
 
  static_assert(GranularityBits::is_valid(Granularity::GRAPHEME));
  static_assert(GranularityBits::is_valid(Granularity::WORD));
  static_assert(GranularityBits::is_valid(Granularity::SENTENCE));
 
  DECL_PRINTER(JSSegmenter)
 
  TQ_OBJECT_CONSTRUCTORS(JSSegmenter)
};
 
}  // namespace internal
}  // namespace v8
 
#include "src/objects/object-macros-undef.h"
 
#endif  // V8_OBJECTS_JS_SEGMENTER_H_