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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/base/ime/utf_offset.h"
#include <string>
#include "base/strings/string16.h"
#include "base/strings/string_piece.h"
#include "base/strings/utf_string_conversions.h"
namespace ui {
base::Optional<size_t> Utf16OffsetFromUtf8Offset(base::StringPiece text,
size_t utf8_offset) {
if (utf8_offset > text.length())
return base::nullopt;
// TODO(hidehiko): Update not to depend on UTF8ToUTF16 to avoid
// unnecessary memory allocation.
base::string16 converted;
if (!base::UTF8ToUTF16(text.data(), utf8_offset, &converted))
return base::nullopt;
return converted.length();
}
base::Optional<size_t> Utf8OffsetFromUtf16Offset(base::StringPiece16 text,
size_t utf16_offset) {
if (utf16_offset > text.length())
return base::nullopt;
// TODO(hidehiko): Update not to depend on UTF16ToUTF8 to avoid
// unnecessary memory allocation.
std::string converted;
if (!base::UTF16ToUTF8(text.data(), utf16_offset, &converted))
return base::nullopt;
return converted.length();
}
} // namespace ui
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