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editing: index.js

// 'path' module extracted from Node.js v8.11.1 (only the posix part)
// transplited with Babel

// 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';

function assertPath(path) {
  if (typeof path !== 'string') {
    throw new TypeError('Path must be a string. Received ' + JSON.stringify(path));
  }
}

// Resolves . and .. elements in a path with directory names
function normalizeStringPosix(path, allowAboveRoot) {
  var res = '';
  var lastSegmentLength = 0;
  var lastSlash = -1;
  var dots = 0;
  var code;
  for (var i = 0; i <= path.length; ++i) {
    if (i < path.length)
      code = path.charCodeAt(i);
    else if (code === 47 /*/*/)
      break;
    else
      code = 47 /*/*/;
    if (code === 47 /*/*/) {
      if (lastSlash === i - 1 || dots === 1) {
        // NOOP
      } else if (lastSlash !== i - 1 && dots === 2) {
        if (res.length < 2 || lastSegmentLength !== 2 || res.charCodeAt(res.length - 1) !== 46 /*.*/ || res.charCodeAt(res.length - 2) !== 46 /*.*/) {
          if (res.length > 2) {
            var lastSlashIndex = res.lastIndexOf('/');
            if (lastSlashIndex !== res.length - 1) {
              if (lastSlashIndex === -1) {
                res = '';
                lastSegmentLength = 0;
              } else {
                res = res.slice(0, lastSlashIndex);
                lastSegmentLength = res.length - 1 - res.lastIndexOf('/');
              }
              lastSlash = i;
              dots = 0;
              continue;
            }
          } else if (res.length === 2 || res.length === 1) {
            res = '';
            lastSegmentLength = 0;
            lastSlash = i;
            dots = 0;
            continue;
          }
        }
        if (allowAboveRoot) {
          if (res.length > 0)
            res += '/..';
          else
            res = '..';
          lastSegmentLength = 2;
        }
      } else {
        if (res.length > 0)
          res += '/' + path.slice(lastSlash + 1, i);
        else
          res = path.slice(lastSlash + 1, i);
        lastSegmentLength = i - lastSlash - 1;
      }
      lastSlash = i;
      dots = 0;
    } else if (code === 46 /*.*/ && dots !== -1) {
      ++dots;
    } else {
      dots = -1;
    }
  }
  return res;
}

var posix = {
  // path.resolve([from ...], to)
  resolve: function resolve() {
    var resolvedPath = '';
    var resolvedAbsolute = false;
    var cwd;

for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
      var path;
      if (i >= 0)
        path = arguments[i];
      else {
        if (cwd === undefined)
          cwd = process.cwd();
        path = cwd;
      }

assertPath(path);

// Skip empty entries
      if (path.length === 0) {
        continue;
      }

resolvedPath = path + '/' + resolvedPath;
      resolvedAbsolute = path.charCodeAt(0) === 47 /*/*/;
    }

// 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 = normalizeStringPosix(resolvedPath, !resolvedAbsolute);

if (resolvedAbsolute) {
      if (resolvedPath.length > 0)
        return '/' + resolvedPath;
      else
        return '/';
    } else if (resolvedPath.length > 0) {
      return resolvedPath;
    } else {
      return '.';
    }
  },

normalize: function normalize(path) {
    assertPath(path);

if (path.length === 0) return '.';

var isAbsolute = path.charCodeAt(0) === 47 /*/*/;
    var trailingSeparator = path.charCodeAt(path.length - 1) === 47 /*/*/;

// Normalize the path
    path = normalizeStringPosix(path, !isAbsolute);

if (path.length === 0 && !isAbsolute) path = '.';
    if (path.length > 0 && trailingSeparator) path += '/';

if (isAbsolute) return '/' + path;
    return path;
  },

isAbsolute: function isAbsolute(path) {
    assertPath(path);
    return path.length > 0 && path.charCodeAt(0) === 47 /*/*/;
  },

join: function join() {
    if (arguments.length === 0)
      return '.';
    var joined;
    for (var i = 0; i < arguments.length; ++i) {
      var arg = arguments[i];
      assertPath(arg);
      if (arg.length > 0) {
        if (joined === undefined)
          joined = arg;
        else
          joined += '/' + arg;
      }
    }
    if (joined === undefined)
      return '.';
    return posix.normalize(joined);
  },

relative: function relative(from, to) {
    assertPath(from);
    assertPath(to);

if (from === to) return '';

from = posix.resolve(from);
    to = posix.resolve(to);

if (from === to) return '';

// Trim any leading backslashes
    var fromStart = 1;
    for (; fromStart < from.length; ++fromStart) {
      if (from.charCodeAt(fromStart) !== 47 /*/*/)
        break;
    }
    var fromEnd = from.length;
    var fromLen = fromEnd - fromStart;

// Trim any leading backslashes
    var toStart = 1;
    for (; toStart < to.length; ++toStart) {
      if (to.charCodeAt(toStart) !== 47 /*/*/)
        break;
    }
    var toEnd = to.length;
    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) {
      if (i === length) {
        if (toLen > length) {
          if (to.charCodeAt(toStart + i) === 47 /*/*/) {
            // We get here if `from` is the exact base path for `to`.
            // For example: from='/foo/bar'; to='/foo/bar/baz'
            return to.slice(toStart + i + 1);
          } else if (i === 0) {
            // We get here if `from` is the root
            // For example: from='/'; to='/foo'
            return to.slice(toStart + i);
          }
        } else if (fromLen > length) {
          if (from.charCodeAt(fromStart + i) === 47 /*/*/) {
            // 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'; to='/'
            lastCommonSep = 0;
          }
        }
        break;
      }
      var fromCode = from.charCodeAt(fromStart + i);
      var toCode = to.charCodeAt(toStart + i);
      if (fromCode !== toCode)
        break;
      else if (fromCode === 47 /*/*/)
        lastCommonSep = i;
    }

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 || from.charCodeAt(i) === 47 /*/*/) {
        if (out.length === 0)
          out += '..';
        else
          out += '/..';
      }
    }

// Lastly, append the rest of the destination (`to`) path that comes after
    // the common path parts
    if (out.length > 0)
      return out + to.slice(toStart + lastCommonSep);
    else {
      toStart += lastCommonSep;
      if (to.charCodeAt(toStart) === 47 /*/*/)
        ++toStart;
      return to.slice(toStart);
    }
  },

_makeLong: function _makeLong(path) {
    return path;
  },

dirname: function dirname(path) {
    assertPath(path);
    if (path.length === 0) return '.';
    var code = path.charCodeAt(0);
    var hasRoot = code === 47 /*/*/;
    var end = -1;
    var matchedSlash = true;
    for (var i = path.length - 1; i >= 1; --i) {
      code = path.charCodeAt(i);
      if (code === 47 /*/*/) {
          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 path.slice(0, end);
  },

basename: function basename(path, ext) {
    if (ext !== undefined && typeof ext !== 'string') throw new TypeError('"ext" argument must be a string');
    assertPath(path);

var start = 0;
    var end = -1;
    var matchedSlash = true;
    var i;

if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
      if (ext.length === path.length && ext === path) return '';
      var extIdx = ext.length - 1;
      var firstNonSlashEnd = -1;
      for (i = path.length - 1; i >= 0; --i) {
        var code = path.charCodeAt(i);
        if (code === 47 /*/*/) {
            // 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 === ext.charCodeAt(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 path.slice(start, end);
    } else {
      for (i = path.length - 1; i >= 0; --i) {
        if (path.charCodeAt(i) === 47 /*/*/) {
            // 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 path.slice(start, end);
    }
  },

extname: function extname(path) {
    assertPath(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 = path.charCodeAt(i);
      if (code === 47 /*/*/) {
          // 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 === 46 /*.*/) {
          // 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;
      }
    }

format: function format(pathObject) {
    if (pathObject === null || typeof pathObject !== 'object') {
      throw new TypeError('The "pathObject" argument must be of type Object. Received type ' + typeof pathObject);
    }
    return _format('/', pathObject);
  },

parse: function parse(path) {
    assertPath(path);

// 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) {
      code = path.charCodeAt(i);
      if (code === 47 /*/*/) {
          // 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 === 46 /*.*/) {
          // 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) {
      if (end !== -1) {
        if (startPart === 0 && isAbsolute) ret.base = ret.name = path.slice(1, end);else ret.base = ret.name = path.slice(startPart, end);
      }
    } else {
      if (startPart === 0 && isAbsolute) {
        ret.name = path.slice(1, startDot);
        ret.base = path.slice(1, end);
      } else {
        ret.name = path.slice(startPart, startDot);
        ret.base = path.slice(startPart, end);
      }
      ret.ext = path.slice(startDot, end);
    }

if (startPart > 0) ret.dir = path.slice(0, startPart - 1);else if (isAbsolute) ret.dir = '/';

return ret;
  },

sep: '/',
  delimiter: ':',
  win32: null,
  posix: null
};

posix.posix = posix;

module.exports = posix;

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