tools/node-hermes/nodelib/path.js

// @nolint
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';

var _primordials = primordials,
    FunctionPrototypeBind = _primordials.FunctionPrototypeBind,
    StringPrototypeCharCodeAt = _primordials.StringPrototypeCharCodeAt,
    StringPrototypeIndexOf = _primordials.StringPrototypeIndexOf,
    StringPrototypeLastIndexOf = _primordials.StringPrototypeLastIndexOf,
    StringPrototypeReplace = _primordials.StringPrototypeReplace,
    StringPrototypeSlice = _primordials.StringPrototypeSlice,
    StringPrototypeToLowerCase = _primordials.StringPrototypeToLowerCase;

var _require = require('internal/constants'),
    CHAR_UPPERCASE_A = _require.CHAR_UPPERCASE_A,
    CHAR_LOWERCASE_A = _require.CHAR_LOWERCASE_A,
    CHAR_UPPERCASE_Z = _require.CHAR_UPPERCASE_Z,
    CHAR_LOWERCASE_Z = _require.CHAR_LOWERCASE_Z,
    CHAR_DOT = _require.CHAR_DOT,
    CHAR_FORWARD_SLASH = _require.CHAR_FORWARD_SLASH,
    CHAR_BACKWARD_SLASH = _require.CHAR_BACKWARD_SLASH,
    CHAR_COLON = _require.CHAR_COLON,
    CHAR_QUESTION_MARK = _require.CHAR_QUESTION_MARK;

var _require2 = require('internal/validators'),
    validateObject = _require2.validateObject,
    validateString = _require2.validateString;

var platformIsWin32 = process.platform === 'win32';

function isPathSeparator(code) {
  return code === CHAR_FORWARD_SLASH || code === CHAR_BACKWARD_SLASH;
}

function isPosixPathSeparator(code) {
  return code === CHAR_FORWARD_SLASH;
}

function isWindowsDeviceRoot(code) {
  return code >= CHAR_UPPERCASE_A && code <= CHAR_UPPERCASE_Z || code >= CHAR_LOWERCASE_A && code <= CHAR_LOWERCASE_Z;
} // Resolves . and .. elements in a path with directory names


function normalizeString(path, allowAboveRoot, separator, isPathSeparator) {
  var res = '';
  var lastSegmentLength = 0;
  var lastSlash = -1;
  var dots = 0;
  var code = 0;

  for (var i = 0; i <= path.length; ++i) {
    if (i < path.length) code = StringPrototypeCharCodeAt(path, i);else if (isPathSeparator(code)) break;else code = CHAR_FORWARD_SLASH;

    if (isPathSeparator(code)) {
      if (lastSlash === i - 1 || dots === 1) {// NOOP
      } else if (dots === 2) {
        if (res.length < 2 || lastSegmentLength !== 2 || StringPrototypeCharCodeAt(res, res.length - 1) !== CHAR_DOT || StringPrototypeCharCodeAt(res, res.length - 2) !== CHAR_DOT) {
          if (res.length > 2) {
            var lastSlashIndex = StringPrototypeLastIndexOf(res, separator);

            if (lastSlashIndex === -1) {
              res = '';
              lastSegmentLength = 0;
            } else {
              res = StringPrototypeSlice(res, 0, lastSlashIndex);
              lastSegmentLength = res.length - 1 - StringPrototypeLastIndexOf(res, separator);
            }

            lastSlash = i;
            dots = 0;
            continue;
          } else if (res.length !== 0) {
            res = '';
            lastSegmentLength = 0;
            lastSlash = i;
            dots = 0;
            continue;
          }
        }

        if (allowAboveRoot) {
          res += res.length > 0 ? "".concat(separator, "..") : '..';
          lastSegmentLength = 2;
        }
      } else {
        if (res.length > 0) res += "".concat(separator).concat(StringPrototypeSlice(path, lastSlash + 1, i));else res = StringPrototypeSlice(path, lastSlash + 1, i);
        lastSegmentLength = i - lastSlash - 1;
      }

      lastSlash = i;
      dots = 0;
    } else if (code === CHAR_DOT && dots !== -1) {
      ++dots;
    } else {
      dots = -1;
    }
  }

  return res;
}
/**
 * @param {string} sep
 * @param {{
 *  dir?: string;
 *  root?: string;
 *  base?: string;
 *  name?: string;
 *  ext?: string;
 *  }} pathObject
 * @returns {string}
 */


function _format(sep, pathObject) {
  validateObject(pathObject, 'pathObject');
  var dir = pathObject.dir || pathObject.root;
  var base = pathObject.base || "".concat(pathObject.name || '').concat(pathObject.ext || '');

  if (!dir) {
    return base;
  }

  return dir === pathObject.root ? "".concat(dir).concat(base) : "".concat(dir).concat(sep).concat(base);
}

var win32 = {
  /**
   * path.resolve([from ...], to)
   * @param {...string} args
   * @returns {string}
   */
  resolve: function resolve() {
    var resolvedDevice = '';
    var resolvedTail = '';
    var resolvedAbsolute = false;

    for (var i = arguments.length - 1; i >= -1; i--) {
      var path = void 0;

      if (i >= 0) {
        path = i < 0 || arguments.length <= i ? undefined : arguments[i];
        validateString(path, 'path'); // Skip empty entries

        if (path.length === 0) {
          continue;
        }
      } else if (resolvedDevice.length === 0) {
        path = process.cwd();
      } else {
        // Windows has the concept of drive-specific current working
        // directories. If we've resolved a drive letter but not yet an
        // absolute path, get cwd for that drive, or the process cwd if
        // the drive cwd is not available. We're sure the device is not
        // a UNC path at this points, because UNC paths are always absolute.
        path = process.env["=".concat(resolvedDevice)] || process.cwd(); // Verify that a cwd was found and that it actually points
        // to our drive. If not, default to the drive's root.

        if (path === undefined || StringPrototypeToLowerCase(StringPrototypeSlice(path, 0, 2)) !== StringPrototypeToLowerCase(resolvedDevice) && StringPrototypeCharCodeAt(path, 2) === CHAR_BACKWARD_SLASH) {
          path = "".concat(resolvedDevice, "\\");
        }
      }

      var len = path.length;
      var rootEnd = 0;
      var device = '';
      var isAbsolute = false;
      var code = StringPrototypeCharCodeAt(path, 0); // Try to match a root

      if (len === 1) {
        if (isPathSeparator(code)) {
          // `path` contains just a path separator
          rootEnd = 1;
          isAbsolute = true;
        }
      } else if (isPathSeparator(code)) {
        // Possible UNC root
        // If we started with a separator, we know we at least have an
        // absolute path of some kind (UNC or otherwise)
        isAbsolute = true;

        if (isPathSeparator(StringPrototypeCharCodeAt(path, 1))) {
          // Matched double path separator at beginning
          var j = 2;
          var last = j; // Match 1 or more non-path separators

          while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
            j++;
          }

          if (j < len && j !== last) {
            var firstPart = StringPrototypeSlice(path, last, j); // Matched!

            last = j; // Match 1 or more path separators

            while (j < len && isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
              j++;
            }

            if (j < len && j !== last) {
              // Matched!
              last = j; // Match 1 or more non-path separators

              while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
                j++;
              }

              if (j === len || j !== last) {
                // We matched a UNC root
                device = "\\\\".concat(firstPart, "\\").concat(StringPrototypeSlice(path, last, j));
                rootEnd = j;
              }
            }
          }
        } else {
          rootEnd = 1;
        }
      } else if (isWindowsDeviceRoot(code) && StringPrototypeCharCodeAt(path, 1) === CHAR_COLON) {
        // Possible device root
        device = StringPrototypeSlice(path, 0, 2);
        rootEnd = 2;

        if (len > 2 && isPathSeparator(StringPrototypeCharCodeAt(path, 2))) {
          // Treat separator following drive name as an absolute path
          // indicator
          isAbsolute = true;
          rootEnd = 3;
        }
      }

      if (device.length > 0) {
        if (resolvedDevice.length > 0) {
          if (StringPrototypeToLowerCase(device) !== StringPrototypeToLowerCase(resolvedDevice)) // This path points to another device so it is not applicable
            continue;
        } else {
          resolvedDevice = device;
        }
      }

      if (resolvedAbsolute) {
        if (resolvedDevice.length > 0) break;
      } else {
        resolvedTail = "".concat(StringPrototypeSlice(path, rootEnd), "\\").concat(resolvedTail);
        resolvedAbsolute = isAbsolute;

        if (isAbsolute && resolvedDevice.length > 0) {
          break;
        }
      }
    } // At this point the path should be resolved to a full absolute path,
    // but handle relative paths to be safe (might happen when process.cwd()
    // fails)
    // Normalize the tail path


    resolvedTail = normalizeString(resolvedTail, !resolvedAbsolute, '\\', isPathSeparator);
    return resolvedAbsolute ? "".concat(resolvedDevice, "\\").concat(resolvedTail) : "".concat(resolvedDevice).concat(resolvedTail) || '.';
  },

  /**
   * @param {string} path
   * @returns {string}
   */
  normalize: function normalize(path) {
    validateString(path, 'path');
    var len = path.length;
    if (len === 0) return '.';
    var rootEnd = 0;
    var device;
    var isAbsolute = false;
    var code = StringPrototypeCharCodeAt(path, 0); // Try to match a root

    if (len === 1) {
      // `path` contains just a single char, exit early to avoid
      // unnecessary work
      return isPosixPathSeparator(code) ? '\\' : path;
    }

    if (isPathSeparator(code)) {
      // Possible UNC root
      // If we started with a separator, we know we at least have an absolute
      // path of some kind (UNC or otherwise)
      isAbsolute = true;

      if (isPathSeparator(StringPrototypeCharCodeAt(path, 1))) {
        // Matched double path separator at beginning
        var j = 2;
        var last = j; // Match 1 or more non-path separators

        while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
          j++;
        }

        if (j < len && j !== last) {
          var firstPart = StringPrototypeSlice(path, last, j); // Matched!

          last = j; // Match 1 or more path separators

          while (j < len && isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
            j++;
          }

          if (j < len && j !== last) {
            // Matched!
            last = j; // Match 1 or more non-path separators

            while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
              j++;
            }

            if (j === len) {
              // We matched a UNC root only
              // Return the normalized version of the UNC root since there
              // is nothing left to process
              return "\\\\".concat(firstPart, "\\").concat(StringPrototypeSlice(path, last), "\\");
            }

            if (j !== last) {
              // We matched a UNC root with leftovers
              device = "\\\\".concat(firstPart, "\\").concat(StringPrototypeSlice(path, last, j));
              rootEnd = j;
            }
          }
        }
      } else {
        rootEnd = 1;
      }
    } else if (isWindowsDeviceRoot(code) && StringPrototypeCharCodeAt(path, 1) === CHAR_COLON) {
      // Possible device root
      device = StringPrototypeSlice(path, 0, 2);
      rootEnd = 2;

      if (len > 2 && isPathSeparator(StringPrototypeCharCodeAt(path, 2))) {
        // Treat separator following drive name as an absolute path
        // indicator
        isAbsolute = true;
        rootEnd = 3;
      }
    }

    var tail = rootEnd < len ? normalizeString(StringPrototypeSlice(path, rootEnd), !isAbsolute, '\\', isPathSeparator) : '';
    if (tail.length === 0 && !isAbsolute) tail = '.';
    if (tail.length > 0 && isPathSeparator(StringPrototypeCharCodeAt(path, len - 1))) tail += '\\';

    if (device === undefined) {
      return isAbsolute ? "\\".concat(tail) : tail;
    }

    return isAbsolute ? "".concat(device, "\\").concat(tail) : "".concat(device).concat(tail);
  },

  /**
   * @param {string} path
   * @returns {boolean}
   */
  isAbsolute: function isAbsolute(path) {
    validateString(path, 'path');
    var len = path.length;
    if (len === 0) return false;
    var code = StringPrototypeCharCodeAt(path, 0);
    return isPathSeparator(code) || // Possible device root
    len > 2 && isWindowsDeviceRoot(code) && StringPrototypeCharCodeAt(path, 1) === CHAR_COLON && isPathSeparator(StringPrototypeCharCodeAt(path, 2));
  },

  /**
   * @param {...string} args
   * @returns {string}
   */
  join: function join() {
    if (arguments.length === 0) return '.';
    var joined;
    var firstPart;

    for (var i = 0; i < arguments.length; ++i) {
      var arg = i < 0 || arguments.length <= i ? undefined : arguments[i];
      validateString(arg, 'path');

      if (arg.length > 0) {
        if (joined === undefined) joined = firstPart = arg;else joined += "\\".concat(arg);
      }
    }

    if (joined === undefined) return '.'; // Make sure that the joined path doesn't start with two slashes, because
    // normalize() will mistake it for a UNC path then.
    //
    // This step is skipped when it is very clear that the user actually
    // intended to point at a UNC path. This is assumed when the first
    // non-empty string arguments starts with exactly two slashes followed by
    // at least one more non-slash character.
    //
    // Note that for normalize() to treat a path as a UNC path it needs to
    // have at least 2 components, so we don't filter for that here.
    // This means that the user can use join to construct UNC paths from
    // a server name and a share name; for example:
    //   path.join('//server', 'share') -> '\\\\server\\share\\')

    var needsReplace = true;
    var slashCount = 0;

    if (isPathSeparator(StringPrototypeCharCodeAt(firstPart, 0))) {
      ++slashCount;
      var firstLen = firstPart.length;

      if (firstLen > 1 && isPathSeparator(StringPrototypeCharCodeAt(firstPart, 1))) {
        ++slashCount;

        if (firstLen > 2) {
          if (isPathSeparator(StringPrototypeCharCodeAt(firstPart, 2))) ++slashCount;else {
            // We matched a UNC path in the first part
            needsReplace = false;
          }
        }
      }
    }

    if (needsReplace) {
      // Find any more consecutive slashes we need to replace
      while (slashCount < joined.length && isPathSeparator(StringPrototypeCharCodeAt(joined, slashCount))) {
        slashCount++;
      } // Replace the slashes if needed


      if (slashCount >= 2) joined = "\\".concat(StringPrototypeSlice(joined, slashCount));
    }

    return win32.normalize(joined);
  },

  /**
   * It will solve the relative path from `from` to `to`, for instancee
   * from = 'C:\\orandea\\test\\aaa'
   * to = 'C:\\orandea\\impl\\bbb'
   * The output of the function should be: '..\\..\\impl\\bbb'
   * @param {string} from
   * @param {string} to
   * @returns {string}
   */
  relative: function relative(from, to) {
    validateString(from, 'from');
    validateString(to, 'to');
    if (from === to) return '';
    var fromOrig = win32.resolve(from);
    var toOrig = win32.resolve(to);
    if (fromOrig === toOrig) return '';
    from = StringPrototypeToLowerCase(fromOrig);
    to = StringPrototypeToLowerCase(toOrig);
    if (from === to) return ''; // Trim any leading backslashes

    var fromStart = 0;

    while (fromStart < from.length && StringPrototypeCharCodeAt(from, fromStart) === CHAR_BACKWARD_SLASH) {
      fromStart++;
    } // Trim trailing backslashes (applicable to UNC paths only)


    var fromEnd = from.length;

    while (fromEnd - 1 > fromStart && StringPrototypeCharCodeAt(from, fromEnd - 1) === CHAR_BACKWARD_SLASH) {
      fromEnd--;
    }

    var fromLen = fromEnd - fromStart; // Trim any leading backslashes

    var toStart = 0;

    while (toStart < to.length && StringPrototypeCharCodeAt(to, toStart) === CHAR_BACKWARD_SLASH) {
      toStart++;
    } // Trim trailing backslashes (applicable to UNC paths only)


    var toEnd = to.length;

    while (toEnd - 1 > toStart && StringPrototypeCharCodeAt(to, toEnd - 1) === CHAR_BACKWARD_SLASH) {
      toEnd--;
    }

    var toLen = toEnd - toStart; // Compare paths to find the longest common path from root

    var length = fromLen < toLen ? fromLen : toLen;
    var lastCommonSep = -1;
    var i = 0;

    for (; i < length; i++) {
      var fromCode = StringPrototypeCharCodeAt(from, fromStart + i);
      if (fromCode !== StringPrototypeCharCodeAt(to, toStart + i)) break;else if (fromCode === CHAR_BACKWARD_SLASH) lastCommonSep = i;
    } // We found a mismatch before the first common path separator was seen, so
    // return the original `to`.


    if (i !== length) {
      if (lastCommonSep === -1) return toOrig;
    } else {
      if (toLen > length) {
        if (StringPrototypeCharCodeAt(to, toStart + i) === CHAR_BACKWARD_SLASH) {
          // We get here if `from` is the exact base path for `to`.
          // For example: from='C:\\foo\\bar'; to='C:\\foo\\bar\\baz'
          return StringPrototypeSlice(toOrig, toStart + i + 1);
        }

        if (i === 2) {
          // We get here if `from` is the device root.
          // For example: from='C:\\'; to='C:\\foo'
          return StringPrototypeSlice(toOrig, toStart + i);
        }
      }

      if (fromLen > length) {
        if (StringPrototypeCharCodeAt(from, fromStart + i) === CHAR_BACKWARD_SLASH) {
          // We get here if `to` is the exact base path for `from`.
          // For example: from='C:\\foo\\bar'; to='C:\\foo'
          lastCommonSep = i;
        } else if (i === 2) {
          // We get here if `to` is the device root.
          // For example: from='C:\\foo\\bar'; to='C:\\'
          lastCommonSep = 3;
        }
      }

      if (lastCommonSep === -1) lastCommonSep = 0;
    }

    var out = ''; // Generate the relative path based on the path difference between `to` and
    // `from`

    for (i = fromStart + lastCommonSep + 1; i <= fromEnd; ++i) {
      if (i === fromEnd || StringPrototypeCharCodeAt(from, i) === CHAR_BACKWARD_SLASH) {
        out += out.length === 0 ? '..' : '\\..';
      }
    }

    toStart += lastCommonSep; // Lastly, append the rest of the destination (`to`) path that comes after
    // the common path parts

    if (out.length > 0) return "".concat(out).concat(StringPrototypeSlice(toOrig, toStart, toEnd));
    if (StringPrototypeCharCodeAt(toOrig, toStart) === CHAR_BACKWARD_SLASH) ++toStart;
    return StringPrototypeSlice(toOrig, toStart, toEnd);
  },

  /**
   * @param {string} path
   * @returns {string}
   */
  toNamespacedPath: function toNamespacedPath(path) {
    // Note: this will *probably* throw somewhere.
    if (typeof path !== 'string' || path.length === 0) return path;
    var resolvedPath = win32.resolve(path);
    if (resolvedPath.length <= 2) return path;

    if (StringPrototypeCharCodeAt(resolvedPath, 0) === CHAR_BACKWARD_SLASH) {
      // Possible UNC root
      if (StringPrototypeCharCodeAt(resolvedPath, 1) === CHAR_BACKWARD_SLASH) {
        var code = StringPrototypeCharCodeAt(resolvedPath, 2);

        if (code !== CHAR_QUESTION_MARK && code !== CHAR_DOT) {
          // Matched non-long UNC root, convert the path to a long UNC path
          return "\\\\?\\UNC\\".concat(StringPrototypeSlice(resolvedPath, 2));
        }
      }
    } else if (isWindowsDeviceRoot(StringPrototypeCharCodeAt(resolvedPath, 0)) && StringPrototypeCharCodeAt(resolvedPath, 1) === CHAR_COLON && StringPrototypeCharCodeAt(resolvedPath, 2) === CHAR_BACKWARD_SLASH) {
      // Matched device root, convert the path to a long UNC path
      return "\\\\?\\".concat(resolvedPath);
    }

    return path;
  },

  /**
   * @param {string} path
   * @returns {string}
   */
  dirname: function dirname(path) {
    validateString(path, 'path');
    var len = path.length;
    if (len === 0) return '.';
    var rootEnd = -1;
    var offset = 0;
    var code = StringPrototypeCharCodeAt(path, 0);

    if (len === 1) {
      // `path` contains just a path separator, exit early to avoid
      // unnecessary work or a dot.
      return isPathSeparator(code) ? path : '.';
    } // Try to match a root


    if (isPathSeparator(code)) {
      // Possible UNC root
      rootEnd = offset = 1;

      if (isPathSeparator(StringPrototypeCharCodeAt(path, 1))) {
        // Matched double path separator at beginning
        var j = 2;
        var last = j; // Match 1 or more non-path separators

        while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
          j++;
        }

        if (j < len && j !== last) {
          // Matched!
          last = j; // Match 1 or more path separators

          while (j < len && isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
            j++;
          }

          if (j < len && j !== last) {
            // Matched!
            last = j; // Match 1 or more non-path separators

            while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
              j++;
            }

            if (j === len) {
              // We matched a UNC root only
              return path;
            }

            if (j !== last) {
              // We matched a UNC root with leftovers
              // Offset by 1 to include the separator after the UNC root to
              // treat it as a "normal root" on top of a (UNC) root
              rootEnd = offset = j + 1;
            }
          }
        }
      } // Possible device root

    } else if (isWindowsDeviceRoot(code) && StringPrototypeCharCodeAt(path, 1) === CHAR_COLON) {
      rootEnd = len > 2 && isPathSeparator(StringPrototypeCharCodeAt(path, 2)) ? 3 : 2;
      offset = rootEnd;
    }

    var end = -1;
    var matchedSlash = true;

    for (var i = len - 1; i >= offset; --i) {
      if (isPathSeparator(StringPrototypeCharCodeAt(path, i))) {
        if (!matchedSlash) {
          end = i;
          break;
        }
      } else {
        // We saw the first non-path separator
        matchedSlash = false;
      }
    }

    if (end === -1) {
      if (rootEnd === -1) return '.';
      end = rootEnd;
    }

    return StringPrototypeSlice(path, 0, end);
  },

  /**
   * @param {string} path
   * @param {string} [ext]
   * @returns {string}
   */
  basename: function basename(path, ext) {
    if (ext !== undefined) validateString(ext, 'ext');
    validateString(path, 'path');
    var start = 0;
    var end = -1;
    var matchedSlash = true; // Check for a drive letter prefix so as not to mistake the following
    // path separator as an extra separator at the end of the path that can be
    // disregarded

    if (path.length >= 2 && isWindowsDeviceRoot(StringPrototypeCharCodeAt(path, 0)) && StringPrototypeCharCodeAt(path, 1) === CHAR_COLON) {
      start = 2;
    }

    if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
      if (ext === path) return '';
      var extIdx = ext.length - 1;
      var firstNonSlashEnd = -1;

      for (var i = path.length - 1; i >= start; --i) {
        var code = StringPrototypeCharCodeAt(path, i);

        if (isPathSeparator(code)) {
          // If we reached a path separator that was not part of a set of path
          // separators at the end of the string, stop now
          if (!matchedSlash) {
            start = i + 1;
            break;
          }
        } else {
          if (firstNonSlashEnd === -1) {
            // We saw the first non-path separator, remember this index in case
            // we need it if the extension ends up not matching
            matchedSlash = false;
            firstNonSlashEnd = i + 1;
          }

          if (extIdx >= 0) {
            // Try to match the explicit extension
            if (code === StringPrototypeCharCodeAt(ext, extIdx)) {
              if (--extIdx === -1) {
                // We matched the extension, so mark this as the end of our path
                // component
                end = i;
              }
            } else {
              // Extension does not match, so our result is the entire path
              // component
              extIdx = -1;
              end = firstNonSlashEnd;
            }
          }
        }
      }

      if (start === end) end = firstNonSlashEnd;else if (end === -1) end = path.length;
      return StringPrototypeSlice(path, start, end);
    }

    for (var _i = path.length - 1; _i >= start; --_i) {
      if (isPathSeparator(StringPrototypeCharCodeAt(path, _i))) {
        // If we reached a path separator that was not part of a set of path
        // separators at the end of the string, stop now
        if (!matchedSlash) {
          start = _i + 1;
          break;
        }
      } else if (end === -1) {
        // We saw the first non-path separator, mark this as the end of our
        // path component
        matchedSlash = false;
        end = _i + 1;
      }
    }

    if (end === -1) return '';
    return StringPrototypeSlice(path, start, end);
  },

  /**
   * @param {string} path
   * @returns {string}
   */
  extname: function extname(path) {
    validateString(path, 'path');
    var start = 0;
    var startDot = -1;
    var startPart = 0;
    var end = -1;
    var matchedSlash = true; // Track the state of characters (if any) we see before our first dot and
    // after any path separator we find

    var preDotState = 0; // Check for a drive letter prefix so as not to mistake the following
    // path separator as an extra separator at the end of the path that can be
    // disregarded

    if (path.length >= 2 && StringPrototypeCharCodeAt(path, 1) === CHAR_COLON && isWindowsDeviceRoot(StringPrototypeCharCodeAt(path, 0))) {
      start = startPart = 2;
    }

    for (var i = path.length - 1; i >= start; --i) {
      var code = StringPrototypeCharCodeAt(path, i);

      if (isPathSeparator(code)) {
        // If we reached a path separator that was not part of a set of path
        // separators at the end of the string, stop now
        if (!matchedSlash) {
          startPart = i + 1;
          break;
        }

        continue;
      }

      if (end === -1) {
        // We saw the first non-path separator, mark this as the end of our
        // extension
        matchedSlash = false;
        end = i + 1;
      }

      if (code === CHAR_DOT) {
        // If this is our first dot, mark it as the start of our extension
        if (startDot === -1) startDot = i;else if (preDotState !== 1) preDotState = 1;
      } else if (startDot !== -1) {
        // We saw a non-dot and non-path separator before our dot, so we should
        // have a good chance at having a non-empty extension
        preDotState = -1;
      }
    }

    if (startDot === -1 || end === -1 || // We saw a non-dot character immediately before the dot
    preDotState === 0 || // The (right-most) trimmed path component is exactly '..'
    preDotState === 1 && startDot === end - 1 && startDot === startPart + 1) {
      return '';
    }

    return StringPrototypeSlice(path, startDot, end);
  },
  format: FunctionPrototypeBind(_format, null, '\\'),

  /**
   * @param {string} path
   * @returns {{
   *  dir: string;
   *  root: string;
   *  base: string;
   *  name: string;
   *  ext: string;
   *  }}
   */
  parse: function parse(path) {
    validateString(path, 'path');
    var ret = {
      root: '',
      dir: '',
      base: '',
      ext: '',
      name: ''
    };
    if (path.length === 0) return ret;
    var len = path.length;
    var rootEnd = 0;
    var code = StringPrototypeCharCodeAt(path, 0);

    if (len === 1) {
      if (isPathSeparator(code)) {
        // `path` contains just a path separator, exit early to avoid
        // unnecessary work
        ret.root = ret.dir = path;
        return ret;
      }

      ret.base = ret.name = path;
      return ret;
    } // Try to match a root


    if (isPathSeparator(code)) {
      // Possible UNC root
      rootEnd = 1;

      if (isPathSeparator(StringPrototypeCharCodeAt(path, 1))) {
        // Matched double path separator at beginning
        var j = 2;
        var last = j; // Match 1 or more non-path separators

        while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
          j++;
        }

        if (j < len && j !== last) {
          // Matched!
          last = j; // Match 1 or more path separators

          while (j < len && isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
            j++;
          }

          if (j < len && j !== last) {
            // Matched!
            last = j; // Match 1 or more non-path separators

            while (j < len && !isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
              j++;
            }

            if (j === len) {
              // We matched a UNC root only
              rootEnd = j;
            } else if (j !== last) {
              // We matched a UNC root with leftovers
              rootEnd = j + 1;
            }
          }
        }
      }
    } else if (isWindowsDeviceRoot(code) && StringPrototypeCharCodeAt(path, 1) === CHAR_COLON) {
      // Possible device root
      if (len <= 2) {
        // `path` contains just a drive root, exit early to avoid
        // unnecessary work
        ret.root = ret.dir = path;
        return ret;
      }

      rootEnd = 2;

      if (isPathSeparator(StringPrototypeCharCodeAt(path, 2))) {
        if (len === 3) {
          // `path` contains just a drive root, exit early to avoid
          // unnecessary work
          ret.root = ret.dir = path;
          return ret;
        }

        rootEnd = 3;
      }
    }

    if (rootEnd > 0) ret.root = StringPrototypeSlice(path, 0, rootEnd);
    var startDot = -1;
    var startPart = rootEnd;
    var end = -1;
    var matchedSlash = true;
    var i = path.length - 1; // Track the state of characters (if any) we see before our first dot and
    // after any path separator we find

    var preDotState = 0; // Get non-dir info

    for (; i >= rootEnd; --i) {
      code = StringPrototypeCharCodeAt(path, i);

      if (isPathSeparator(code)) {
        // If we reached a path separator that was not part of a set of path
        // separators at the end of the string, stop now
        if (!matchedSlash) {
          startPart = i + 1;
          break;
        }

        continue;
      }

      if (end === -1) {
        // We saw the first non-path separator, mark this as the end of our
        // extension
        matchedSlash = false;
        end = i + 1;
      }

      if (code === CHAR_DOT) {
        // If this is our first dot, mark it as the start of our extension
        if (startDot === -1) startDot = i;else if (preDotState !== 1) preDotState = 1;
      } else if (startDot !== -1) {
        // We saw a non-dot and non-path separator before our dot, so we should
        // have a good chance at having a non-empty extension
        preDotState = -1;
      }
    }

    if (end !== -1) {
      if (startDot === -1 || // We saw a non-dot character immediately before the dot
      preDotState === 0 || // The (right-most) trimmed path component is exactly '..'
      preDotState === 1 && startDot === end - 1 && startDot === startPart + 1) {
        ret.base = ret.name = StringPrototypeSlice(path, startPart, end);
      } else {
        ret.name = StringPrototypeSlice(path, startPart, startDot);
        ret.base = StringPrototypeSlice(path, startPart, end);
        ret.ext = StringPrototypeSlice(path, startDot, end);
      }
    } // If the directory is the root, use the entire root as the `dir` including
    // the trailing slash if any (`C:\abc` -> `C:\`). Otherwise, strip out the
    // trailing slash (`C:\abc\def` -> `C:\abc`).


    if (startPart > 0 && startPart !== rootEnd) ret.dir = StringPrototypeSlice(path, 0, startPart - 1);else ret.dir = ret.root;
    return ret;
  },
  sep: '\\',
  delimiter: ';',
  win32: null,
  posix: null
};

var posixCwd = function () {
  if (platformIsWin32) {
    // Converts Windows' backslash path separators to POSIX forward slashes
    // and truncates any drive indicator
    var regexp = /\\/g;
    return function () {
      var cwd = StringPrototypeReplace(process.cwd(), regexp, '/');
      return StringPrototypeSlice(cwd, StringPrototypeIndexOf(cwd, '/'));
    };
  } // We're already on POSIX, no need for any transformations


  return function () {
    return process.cwd();
  };
}();

var posix = {
  /**
   * path.resolve([from ...], to)
   * @param {...string} args
   * @returns {string}
   */
  resolve: function resolve() {
    var resolvedPath = '';
    var resolvedAbsolute = false;

    for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
      var path = i >= 0 ? i < 0 || arguments.length <= i ? undefined : arguments[i] : posixCwd();
      validateString(path, 'path'); // Skip empty entries

      if (path.length === 0) {
        continue;
      }

      resolvedPath = "".concat(path, "/").concat(resolvedPath);
      resolvedAbsolute = StringPrototypeCharCodeAt(path, 0) === CHAR_FORWARD_SLASH;
    } // At this point the path should be resolved to a full absolute path, but
    // handle relative paths to be safe (might happen when process.cwd() fails)
    // Normalize the path


    resolvedPath = normalizeString(resolvedPath, !resolvedAbsolute, '/', isPosixPathSeparator);

    if (resolvedAbsolute) {
      return "/".concat(resolvedPath);
    }

    return resolvedPath.length > 0 ? resolvedPath : '.';
  },

  /**
   * @param {string} path
   * @returns {string}
   */
  normalize: function normalize(path) {
    validateString(path, 'path');
    if (path.length === 0) return '.';
    var isAbsolute = StringPrototypeCharCodeAt(path, 0) === CHAR_FORWARD_SLASH;
    var trailingSeparator = StringPrototypeCharCodeAt(path, path.length - 1) === CHAR_FORWARD_SLASH; // Normalize the path

    path = normalizeString(path, !isAbsolute, '/', isPosixPathSeparator);

    if (path.length === 0) {
      if (isAbsolute) return '/';
      return trailingSeparator ? './' : '.';
    }

    if (trailingSeparator) path += '/';
    return isAbsolute ? "/".concat(path) : path;
  },

  /**
   * @param {string} path
   * @returns {boolean}
   */
  isAbsolute: function isAbsolute(path) {
    validateString(path, 'path');
    return path.length > 0 && StringPrototypeCharCodeAt(path, 0) === CHAR_FORWARD_SLASH;
  },

  /**
   * @param {...string} args
   * @returns {string}
   */
  join: function join() {
    if (arguments.length === 0) return '.';
    var joined;

    for (var i = 0; i < arguments.length; ++i) {
      var arg = i < 0 || arguments.length <= i ? undefined : arguments[i];
      validateString(arg, 'path');

      if (arg.length > 0) {
        if (joined === undefined) joined = arg;else joined += "/".concat(arg);
      }
    }

    if (joined === undefined) return '.';
    return posix.normalize(joined);
  },

  /**
   * @param {string} from
   * @param {string} to
   * @returns {string}
   */
  relative: function relative(from, to) {
    validateString(from, 'from');
    validateString(to, 'to');
    if (from === to) return ''; // Trim leading forward slashes.

    from = posix.resolve(from);
    to = posix.resolve(to);
    if (from === to) return '';
    var fromStart = 1;
    var fromEnd = from.length;
    var fromLen = fromEnd - fromStart;
    var toStart = 1;
    var toLen = to.length - toStart; // Compare paths to find the longest common path from root

    var length = fromLen < toLen ? fromLen : toLen;
    var lastCommonSep = -1;
    var i = 0;

    for (; i < length; i++) {
      var fromCode = StringPrototypeCharCodeAt(from, fromStart + i);
      if (fromCode !== StringPrototypeCharCodeAt(to, toStart + i)) break;else if (fromCode === CHAR_FORWARD_SLASH) lastCommonSep = i;
    }

    if (i === length) {
      if (toLen > length) {
        if (StringPrototypeCharCodeAt(to, toStart + i) === CHAR_FORWARD_SLASH) {
          // We get here if `from` is the exact base path for `to`.
          // For example: from='/foo/bar'; to='/foo/bar/baz'
          return StringPrototypeSlice(to, toStart + i + 1);
        }

        if (i === 0) {
          // We get here if `from` is the root
          // For example: from='/'; to='/foo'
          return StringPrototypeSlice(to, toStart + i);
        }
      } else if (fromLen > length) {
        if (StringPrototypeCharCodeAt(from, fromStart + i) === CHAR_FORWARD_SLASH) {
          // We get here if `to` is the exact base path for `from`.
          // For example: from='/foo/bar/baz'; to='/foo/bar'
          lastCommonSep = i;
        } else if (i === 0) {
          // We get here if `to` is the root.
          // For example: from='/foo/bar'; to='/'
          lastCommonSep = 0;
        }
      }
    }

    var out = ''; // Generate the relative path based on the path difference between `to`
    // and `from`.

    for (i = fromStart + lastCommonSep + 1; i <= fromEnd; ++i) {
      if (i === fromEnd || StringPrototypeCharCodeAt(from, i) === CHAR_FORWARD_SLASH) {
        out += out.length === 0 ? '..' : '/..';
      }
    } // Lastly, append the rest of the destination (`to`) path that comes after
    // the common path parts.


    return "".concat(out).concat(StringPrototypeSlice(to, toStart + lastCommonSep));
  },

  /**
   * @param {string} path
   * @returns {string}
   */
  toNamespacedPath: function toNamespacedPath(path) {
    // Non-op on posix systems
    return path;
  },

  /**
   * @param {string} path
   * @returns {string}
   */
  dirname: function dirname(path) {
    validateString(path, 'path');
    if (path.length === 0) return '.';
    var hasRoot = StringPrototypeCharCodeAt(path, 0) === CHAR_FORWARD_SLASH;
    var end = -1;
    var matchedSlash = true;

    for (var i = path.length - 1; i >= 1; --i) {
      if (StringPrototypeCharCodeAt(path, i) === CHAR_FORWARD_SLASH) {
        if (!matchedSlash) {
          end = i;
          break;
        }
      } else {
        // We saw the first non-path separator
        matchedSlash = false;
      }
    }

    if (end === -1) return hasRoot ? '/' : '.';
    if (hasRoot && end === 1) return '//';
    return StringPrototypeSlice(path, 0, end);
  },

  /**
   * @param {string} path
   * @param {string} [ext]
   * @returns {string}
   */
  basename: function basename(path, ext) {
    if (ext !== undefined) validateString(ext, 'ext');
    validateString(path, 'path');
    var start = 0;
    var end = -1;
    var matchedSlash = true;

    if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
      if (ext === path) return '';
      var extIdx = ext.length - 1;
      var firstNonSlashEnd = -1;

      for (var i = path.length - 1; i >= 0; --i) {
        var code = StringPrototypeCharCodeAt(path, i);

        if (code === CHAR_FORWARD_SLASH) {
          // If we reached a path separator that was not part of a set of path
          // separators at the end of the string, stop now
          if (!matchedSlash) {
            start = i + 1;
            break;
          }
        } else {
          if (firstNonSlashEnd === -1) {
            // We saw the first non-path separator, remember this index in case
            // we need it if the extension ends up not matching
            matchedSlash = false;
            firstNonSlashEnd = i + 1;
          }

          if (extIdx >= 0) {
            // Try to match the explicit extension
            if (code === StringPrototypeCharCodeAt(ext, extIdx)) {
              if (--extIdx === -1) {
                // We matched the extension, so mark this as the end of our path
                // component
                end = i;
              }
            } else {
              // Extension does not match, so our result is the entire path
              // component
              extIdx = -1;
              end = firstNonSlashEnd;
            }
          }
        }
      }

      if (start === end) end = firstNonSlashEnd;else if (end === -1) end = path.length;
      return StringPrototypeSlice(path, start, end);
    }

    for (var _i2 = path.length - 1; _i2 >= 0; --_i2) {
      if (StringPrototypeCharCodeAt(path, _i2) === CHAR_FORWARD_SLASH) {
        // If we reached a path separator that was not part of a set of path
        // separators at the end of the string, stop now
        if (!matchedSlash) {
          start = _i2 + 1;
          break;
        }
      } else if (end === -1) {
        // We saw the first non-path separator, mark this as the end of our
        // path component
        matchedSlash = false;
        end = _i2 + 1;
      }
    }

    if (end === -1) return '';
    return StringPrototypeSlice(path, start, end);
  },

  /**
   * @param {string} path
   * @returns {string}
   */
  extname: function extname(path) {
    validateString(path, 'path');
    var startDot = -1;
    var startPart = 0;
    var end = -1;
    var matchedSlash = true; // Track the state of characters (if any) we see before our first dot and
    // after any path separator we find

    var preDotState = 0;

    for (var i = path.length - 1; i >= 0; --i) {
      var code = StringPrototypeCharCodeAt(path, i);

      if (code === CHAR_FORWARD_SLASH) {
        // If we reached a path separator that was not part of a set of path
        // separators at the end of the string, stop now
        if (!matchedSlash) {
          startPart = i + 1;
          break;
        }

        continue;
      }

      if (end === -1) {
        // We saw the first non-path separator, mark this as the end of our
        // extension
        matchedSlash = false;
        end = i + 1;
      }

      if (code === CHAR_DOT) {
        // If this is our first dot, mark it as the start of our extension
        if (startDot === -1) startDot = i;else if (preDotState !== 1) preDotState = 1;
      } else if (startDot !== -1) {
        // We saw a non-dot and non-path separator before our dot, so we should
        // have a good chance at having a non-empty extension
        preDotState = -1;
      }
    }

    if (startDot === -1 || end === -1 || // We saw a non-dot character immediately before the dot
    preDotState === 0 || // The (right-most) trimmed path component is exactly '..'
    preDotState === 1 && startDot === end - 1 && startDot === startPart + 1) {
      return '';
    }

    return StringPrototypeSlice(path, startDot, end);
  },
  format: FunctionPrototypeBind(_format, null, '/'),

  /**
   * @param {string} path
   * @returns {{
   *   dir: string;
   *   root: string;
   *   base: string;
   *   name: string;
   *   ext: string;
   *   }}
   */
  parse: function parse(path) {
    validateString(path, 'path');
    var ret = {
      root: '',
      dir: '',
      base: '',
      ext: '',
      name: ''
    };
    if (path.length === 0) return ret;
    var isAbsolute = StringPrototypeCharCodeAt(path, 0) === CHAR_FORWARD_SLASH;
    var start;

    if (isAbsolute) {
      ret.root = '/';
      start = 1;
    } else {
      start = 0;
    }

    var startDot = -1;
    var startPart = 0;
    var end = -1;
    var matchedSlash = true;
    var i = path.length - 1; // Track the state of characters (if any) we see before our first dot and
    // after any path separator we find

    var preDotState = 0; // Get non-dir info

    for (; i >= start; --i) {
      var code = StringPrototypeCharCodeAt(path, i);

      if (code === CHAR_FORWARD_SLASH) {
        // If we reached a path separator that was not part of a set of path
        // separators at the end of the string, stop now
        if (!matchedSlash) {
          startPart = i + 1;
          break;
        }

        continue;
      }

      if (end === -1) {
        // We saw the first non-path separator, mark this as the end of our
        // extension
        matchedSlash = false;
        end = i + 1;
      }

      if (code === CHAR_DOT) {
        // If this is our first dot, mark it as the start of our extension
        if (startDot === -1) startDot = i;else if (preDotState !== 1) preDotState = 1;
      } else if (startDot !== -1) {
        // We saw a non-dot and non-path separator before our dot, so we should
        // have a good chance at having a non-empty extension
        preDotState = -1;
      }
    }

    if (end !== -1) {
      var _start = startPart === 0 && isAbsolute ? 1 : startPart;

      if (startDot === -1 || // We saw a non-dot character immediately before the dot
      preDotState === 0 || // The (right-most) trimmed path component is exactly '..'
      preDotState === 1 && startDot === end - 1 && startDot === startPart + 1) {
        ret.base = ret.name = StringPrototypeSlice(path, _start, end);
      } else {
        ret.name = StringPrototypeSlice(path, _start, startDot);
        ret.base = StringPrototypeSlice(path, _start, end);
        ret.ext = StringPrototypeSlice(path, startDot, end);
      }
    }

    if (startPart > 0) ret.dir = StringPrototypeSlice(path, 0, startPart - 1);else if (isAbsolute) ret.dir = '/';
    return ret;
  },
  sep: '/',
  delimiter: ':',
  win32: null,
  posix: null
};
posix.win32 = win32.win32 = win32;
posix.posix = win32.posix = posix; // Legacy internal API, docs-only deprecated: DEP0080

win32._makeLong = win32.toNamespacedPath;
posix._makeLong = posix.toNamespacedPath;
module.exports = platformIsWin32 ? win32 : posix;