File: utf_offset.h

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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_BASE_IME_UTF_OFFSET_H_
#define UI_BASE_IME_UTF_OFFSET_H_

#include <stddef.h>

#include <optional>
#include <string_view>

#include "base/component_export.h"

namespace ui {

// Given UTF8 string and its valid offset, returns the offset in UTF16.
// Returns nullopt if the given offset is invalid (not at a valid boundary
// or out of range).
COMPONENT_EXPORT(UI_BASE)
std::optional<size_t> Utf16OffsetFromUtf8Offset(std::string_view text,
                                                size_t utf8_offset);

// Given UTF16 string and its valid offset, returns the offset in UTF8.
// Returns nullopt if the given offset is invalid (not at a valid boundary
// or out of range).
COMPONENT_EXPORT(UI_BASE)
std::optional<size_t> Utf8OffsetFromUtf16Offset(std::u16string_view text,
                                                size_t utf16_offset);

}  // namespace ui

#endif  // UI_BASE_IME_UTF_OFFSET_H_