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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
#ifndef V8_OBJECTS_JS_SEGMENTER_H_
#define V8_OBJECTS_JS_SEGMENTER_H_
#include "src/heap/factory.h"
#include "src/isolate.h"
#include "src/objects.h"
#include "src/objects/managed.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 v8 {
namespace internal {
class JSSegmenter : public JSObject {
public:
// Initializes segmenter object with properties derived from input
// locales and options.
V8_WARN_UNUSED_RESULT static MaybeHandle<JSSegmenter> Initialize(
Isolate* isolate, Handle<JSSegmenter> segmenter_holder,
Handle<Object> locales, Handle<Object> options);
V8_WARN_UNUSED_RESULT static Handle<JSObject> ResolvedOptions(
Isolate* isolate, Handle<JSSegmenter> segmenter_holder);
Handle<String> LineBreakStyleAsString() const;
Handle<String> GranularityAsString() const;
DECL_CAST(JSSegmenter)
// Segmenter accessors.
DECL_ACCESSORS(locale, String)
DECL_ACCESSORS(icu_break_iterator, Managed<icu::BreakIterator>)
// LineBreakStyle: identifying the style used for line break.
//
// ecma402 #sec-segmenter-internal-slots
enum class LineBreakStyle {
NOTSET, // While the granularity is not LINE
STRICT, // CSS level 3 line-break=strict, e.g. treat CJ as NS
NORMAL, // CSS level 3 line-break=normal, e.g. treat CJ as ID, break before
// hyphens for ja,zh
LOOSE, // CSS level 3 line-break=loose
COUNT
};
inline void set_line_break_style(LineBreakStyle line_break_style);
inline LineBreakStyle line_break_style() const;
// 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
LINE, // for line-breaks
COUNT
};
inline void set_granularity(Granularity granularity);
inline Granularity granularity() const;
// Bit positions in |flags|.
#define FLAGS_BIT_FIELDS(V, _) \
V(LineBreakStyleBits, LineBreakStyle, 3, _) \
V(GranularityBits, Granularity, 3, _)
DEFINE_BIT_FIELDS(FLAGS_BIT_FIELDS)
#undef FLAGS_BIT_FIELDS
STATIC_ASSERT(LineBreakStyle::NOTSET <= LineBreakStyleBits::kMax);
STATIC_ASSERT(LineBreakStyle::STRICT <= LineBreakStyleBits::kMax);
STATIC_ASSERT(LineBreakStyle::NORMAL <= LineBreakStyleBits::kMax);
STATIC_ASSERT(LineBreakStyle::LOOSE <= LineBreakStyleBits::kMax);
STATIC_ASSERT(Granularity::GRAPHEME <= GranularityBits::kMax);
STATIC_ASSERT(Granularity::WORD <= GranularityBits::kMax);
STATIC_ASSERT(Granularity::SENTENCE <= GranularityBits::kMax);
STATIC_ASSERT(Granularity::LINE <= GranularityBits::kMax);
// [flags] Bit field containing various flags about the function.
DECL_INT_ACCESSORS(flags)
DECL_PRINTER(JSSegmenter)
DECL_VERIFIER(JSSegmenter)
// Layout description.
static const int kJSSegmenterOffset = JSObject::kHeaderSize;
static const int kLocaleOffset = kJSSegmenterOffset + kPointerSize;
static const int kICUBreakIteratorOffset = kLocaleOffset + kPointerSize;
static const int kFlagsOffset = kICUBreakIteratorOffset + kPointerSize;
static const int kSize = kFlagsOffset + kPointerSize;
private:
static LineBreakStyle GetLineBreakStyle(const char* str);
static Granularity GetGranularity(const char* str);
DISALLOW_IMPLICIT_CONSTRUCTORS(JSSegmenter);
};
} // namespace internal
} // namespace v8
#include "src/objects/object-macros-undef.h"
#endif // V8_OBJECTS_JS_SEGMENTER_H_
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