chromium/base/strings/utf_offset_string_conversions.h

// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_STRINGS_UTF_OFFSET_STRING_CONVERSIONS_H_
#define BASE_STRINGS_UTF_OFFSET_STRING_CONVERSIONS_H_

#include <stddef.h>

#include <string>
#include <string_view>
#include <vector>

#include "base/base_export.h"

namespace base {

// A helper class and associated data structures to adjust offsets into a
// string in response to various adjustments one might do to that string
// (e.g., eliminating a range).  For details on offsets, see the comments by
// the AdjustOffsets() function below.
class BASE_EXPORT OffsetAdjuster { … };

// Like the conversions in utf_string_conversions.h, but also fills in an
// |adjustments| parameter that reflects the alterations done to the string.
// It may be NULL.
BASE_EXPORT bool UTF8ToUTF16WithAdjustments(
    const char* src,
    size_t src_len,
    std::u16string* output,
    base::OffsetAdjuster::Adjustments* adjustments);
[[nodiscard]] BASE_EXPORT std::u16string UTF8ToUTF16WithAdjustments(
    std::string_view utf8,
    base::OffsetAdjuster::Adjustments* adjustments);
// As above, but instead internally examines the adjustments and applies them
// to |offsets_for_adjustment|.  Input offsets greater than the length of the
// input string will be set to std::u16string::npos.  See comments by
// AdjustOffsets().
BASE_EXPORT std::u16string UTF8ToUTF16AndAdjustOffsets(
    std::string_view utf8,
    std::vector<size_t>* offsets_for_adjustment);
BASE_EXPORT std::string UTF16ToUTF8AndAdjustOffsets(
    std::u16string_view utf16,
    std::vector<size_t>* offsets_for_adjustment);

}  // namespace base

#endif  // BASE_STRINGS_UTF_OFFSET_STRING_CONVERSIONS_H_