/*
    This file is part of TON Blockchain Library.

    TON Blockchain Library is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    (at your option) any later version.

    TON Blockchain Library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.

    Copyright 2017-2020 Telegram Systems LLP
*/

#include "td/utils/PathView.h"

#include "td/utils/misc.h"

namespace td {

PathView::PathView(Slice path) : path_(path) {
  last_slash_ = narrow_cast<int32>(path_.size()) - 1;
  while (last_slash_ >= 0 && !is_slash(path_[last_slash_])) {
    last_slash_--;
  }

  last_dot_ = static_cast<int32>(path_.size());
  for (auto i = last_dot_ - 1; i > last_slash_ + 1; i--) {
    if (path_[i] == '.') {
      last_dot_ = i;
      break;
    }
  }
}

Slice PathView::relative(Slice path, Slice dir, bool force) {
  if (begins_with(path, dir)) {
    path.remove_prefix(dir.size());
    return path;
  }
  if (force) {
    return Slice();
  }
  return path;
}

Slice PathView::dir_and_file(Slice path) {
  auto last_slash = static_cast<int32>(path.size()) - 1;
  while (last_slash >= 0 && !is_slash(path[last_slash])) {
    last_slash--;
  }
  if (last_slash < 0) {
    return Slice();
  }
  last_slash--;
  while (last_slash >= 0 && !is_slash(path[last_slash])) {
    last_slash--;
  }
  if (last_slash < 0) {
    return Slice();
  }
  return path.substr(last_slash + 1);
}

}  // namespace td