const _DRIVE_LETTER_START_RE = /^[A-Za-z]:\//;
function normalizeWindowsPath(input = "") {
  if (!input) {
    return input;
  }
  return input.replace(/\\/g, "/").replace(_DRIVE_LETTER_START_RE, (r) => r.toUpperCase());
}

const _UNC_REGEX = /^[/\\]{2}/;
const _IS_ABSOLUTE_RE = /^[/\\](?![/\\])|^[/\\]{2}(?!\.)|^[A-Za-z]:[/\\]/;
const _DRIVE_LETTER_RE = /^[A-Za-z]:$/;
const _ROOT_FOLDER_RE = /^\/([A-Za-z]:)?$/;
const sep = "/";
const delimiter = ":";
const normalize = function(path) {
  if (path.length === 0) {
    return ".";
  }
  path = normalizeWindowsPath(path);
  const isUNCPath = path.match(_UNC_REGEX);
  const isPathAbsolute = isAbsolute(path);
  const trailingSeparator = path[path.length - 1] === "/";
  path = normalizeString(path, !isPathAbsolute);
  if (path.length === 0) {
    if (isPathAbsolute) {
      return "/";
    }
    return trailingSeparator ? "./" : ".";
  }
  if (trailingSeparator) {
    path += "/";
  }
  if (_DRIVE_LETTER_RE.test(path)) {
    path += "/";
  }
  if (isUNCPath) {
    if (!isPathAbsolute) {
      return `//./${path}`;
    }
    return `//${path}`;
  }
  return isPathAbsolute && !isAbsolute(path) ? `/${path}` : path;
};
const join = function(...arguments_) {
  if (arguments_.length === 0) {
    return ".";
  }
  let joined;
  for (const argument of arguments_) {
    if (argument && argument.length > 0) {
      if (joined === void 0) {
        joined = argument;
      } else {
        joined += `/${argument}`;
      }
    }
  }
  if (joined === void 0) {
    return ".";
  }
  return normalize(joined.replace(/\/\/+/g, "/"));
};
function cwd() {
  if (typeof process !== "undefined" && typeof process.cwd === "function") {
    return process.cwd().replace(/\\/g, "/");
  }
  return "/";
}
const resolve = function(...arguments_) {
  arguments_ = arguments_.map((argument) => normalizeWindowsPath(argument));
  let resolvedPath = "";
  let resolvedAbsolute = false;
  for (let index = arguments_.length - 1; index >= -1 && !resolvedAbsolute; index--) {
    const path = index >= 0 ? arguments_[index] : cwd();
    if (!path || path.length === 0) {
      continue;
    }
    resolvedPath = `${path}/${resolvedPath}`;
    resolvedAbsolute = isAbsolute(path);
  }
  resolvedPath = normalizeString(resolvedPath, !resolvedAbsolute);
  if (resolvedAbsolute && !isAbsolute(resolvedPath)) {
    return `/${resolvedPath}`;
  }
  return resolvedPath.length > 0 ? resolvedPath : ".";
};
function normalizeString(path, allowAboveRoot) {
  let res = "";
  let lastSegmentLength = 0;
  let lastSlash = -1;
  let dots = 0;
  let char = null;
  for (let index = 0; index <= path.length; ++index) {
    if (index < path.length) {
      char = path[index];
    } else if (char === "/") {
      break;
    } else {
      char = "/";
    }
    if (char === "/") {
      if (lastSlash === index - 1 || dots === 1) ; else if (dots === 2) {
        if (res.length < 2 || lastSegmentLength !== 2 || res[res.length - 1] !== "." || res[res.length - 2] !== ".") {
          if (res.length > 2) {
            const lastSlashIndex = res.lastIndexOf("/");
            if (lastSlashIndex === -1) {
              res = "";
              lastSegmentLength = 0;
            } else {
              res = res.slice(0, lastSlashIndex);
              lastSegmentLength = res.length - 1 - res.lastIndexOf("/");
            }
            lastSlash = index;
            dots = 0;
            continue;
          } else if (res.length > 0) {
            res = "";
            lastSegmentLength = 0;
            lastSlash = index;
            dots = 0;
            continue;
          }
        }
        if (allowAboveRoot) {
          res += res.length > 0 ? "/.." : "..";
          lastSegmentLength = 2;
        }
      } else {
        if (res.length > 0) {
          res += `/${path.slice(lastSlash + 1, index)}`;
        } else {
          res = path.slice(lastSlash + 1, index);
        }
        lastSegmentLength = index - lastSlash - 1;
      }
      lastSlash = index;
      dots = 0;
    } else if (char === "." && dots !== -1) {
      ++dots;
    } else {
      dots = -1;
    }
  }
  return res;
}
const isAbsolute = function(p) {
  return _IS_ABSOLUTE_RE.test(p);
};
const toNamespacedPath = function(p) {
  return normalizeWindowsPath(p);
};
const _EXTNAME_RE = /.(\.[^./]+)$/;
const extname = function(p) {
  const match = _EXTNAME_RE.exec(normalizeWindowsPath(p));
  return match && match[1] || "";
};
const relative = function(from, to) {
  const _from = resolve(from).replace(_ROOT_FOLDER_RE, "$1").split("/");
  const _to = resolve(to).replace(_ROOT_FOLDER_RE, "$1").split("/");
  if (_to[0][1] === ":" && _from[0][1] === ":" && _from[0] !== _to[0]) {
    return _to.join("/");
  }
  const _fromCopy = [..._from];
  for (const segment of _fromCopy) {
    if (_to[0] !== segment) {
      break;
    }
    _from.shift();
    _to.shift();
  }
  return [..._from.map(() => ".."), ..._to].join("/");
};
const dirname = function(p) {
  const segments = normalizeWindowsPath(p).replace(/\/$/, "").split("/").slice(0, -1);
  if (segments.length === 1 && _DRIVE_LETTER_RE.test(segments[0])) {
    segments[0] += "/";
  }
  return segments.join("/") || (isAbsolute(p) ? "/" : ".");
};
const format = function(p) {
  const segments = [p.root, p.dir, p.base ?? p.name + p.ext].filter(Boolean);
  return normalizeWindowsPath(
    p.root ? resolve(...segments) : segments.join("/")
  );
};
const basename = function(p, extension) {
  const lastSegment = normalizeWindowsPath(p).split("/").pop();
  return extension && lastSegment.endsWith(extension) ? lastSegment.slice(0, -extension.length) : lastSegment;
};
const parse = function(p) {
  const root = normalizeWindowsPath(p).split("/").shift() || "/";
  const base = basename(p);
  const extension = extname(base);
  return {
    root,
    dir: dirname(p),
    base,
    ext: extension,
    name: base.slice(0, base.length - extension.length)
  };
};

const path = {
  __proto__: null,
  basename: basename,
  delimiter: delimiter,
  dirname: dirname,
  extname: extname,
  format: format,
  isAbsolute: isAbsolute,
  join: join,
  normalize: normalize,
  normalizeString: normalizeString,
  parse: parse,
  relative: relative,
  resolve: resolve,
  sep: sep,
  toNamespacedPath: toNamespacedPath
};

export { normalize as a, normalizeString as b, relative as c, delimiter as d, extname as e, dirname as f, format as g, basename as h, isAbsolute as i, join as j, parse as k, normalizeWindowsPath as n, path as p, resolve as r, sep as s, toNamespacedPath as t };