chromium/src/third_party/blink/renderer/platform/wtf/text/text_offset_map.cc

// Copyright 2019 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 "third_party/blink/renderer/platform/wtf/text/text_offset_map.h"

#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"

namespace WTF {

std::ostream& operator<<(std::ostream& stream,
                         const TextOffsetMap::Entry& entry) {
  return stream << "{" << entry.source << ", " << entry.target << "}";
}

void TextOffsetMap::Append(wtf_size_t source, wtf_size_t target) {
  DCHECK(IsEmpty() ||
         (source > entries_.back().source && target > entries_.back().target));
  entries_.emplace_back(source, target);
}

void TextOffsetMap::Append(const icu::Edits& edits) {
  DCHECK(IsEmpty());

  UErrorCode error = U_ZERO_ERROR;
  auto edit = edits.getFineChangesIterator();
  while (edit.next(error)) {
    if (!edit.hasChange() || edit.oldLength() == edit.newLength())
      continue;

    entries_.emplace_back(edit.sourceIndex() + edit.oldLength(),
                          edit.destinationIndex() + edit.newLength());
  }
  DCHECK(U_SUCCESS(error));
}

}  // namespace WTF