chromium/third_party/blink/renderer/platform/fonts/utf16_ragel_iterator.h

// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_UTF16_RAGEL_ITERATOR_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_UTF16_RAGEL_ITERATOR_H_

#include <unicode/uchar.h>

#include "base/check_op.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/text/emoji_segmentation_category.h"
#include "third_party/blink/renderer/platform/text/emoji_segmentation_category_inline_header.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/character_names.h"

namespace blink {

// UTF16RagelIterator is set up on top of a UTF-16 UChar* buffer iterating over
// a Blink internal text string and as such is used as an adapter between Blink
// strings and the Ragel-based emoji scanner. It supports forwarding and
// reversing using arithmetic operators. Dereferencing the iterator means
// retrieving a character class as defined in the Ragel grammar of
// third-party/emoji-segmenter. The dereferenced character category is cached
// since Ragel dereferences multiple times without moving the iterator's cursor.
class PLATFORM_EXPORT UTF16RagelIterator { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_UTF16_RAGEL_ITERATOR_H_