// 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';

const errors = require('internal/errors');

function assertPath(path) {

if (typeof path !== 'string') {

throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'path', 'string');

}

}

// Resolves . and .. elements in a path with directory names

function normalizeStringWin32(path, allowAboveRoot) {

var res = '';

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/*/*/ || code === 92/*\*/)

break;

else

code = 47/*/*/;

if (code === 47/*/*/ || code === 92/*\*/) {

if (lastSlash === i - 1 || dots === 1) {

// NOOP

} else if (lastSlash !== i - 1 && dots === 2) {

if (res.length < 2 ||

res.charCodeAt(res.length - 1) !== 46/*.*/ ||

res.charCodeAt(res.length - 2) !== 46/*.*/) {

if (res.length > 2) {

const start = res.length - 1;

var j = start;

for (; j >= 0; --j) {

if (res.charCodeAt(j) === 92/*\*/)

break;

}

if (j !== start) {

if (j === -1)

res = '';

else

res = res.slice(0, j);

lastSlash = i;

dots = 0;

continue;

}

} else if (res.length === 2 || res.length === 1) {

res = '';

lastSlash = i;

dots = 0;

continue;

}

}

if (allowAboveRoot) {

if (res.length > 0)

res += '\\..';

else

res = '..';

}

} else {

if (res.length > 0)

res += '\\' + path.slice(lastSlash + 1, i);

else

res = path.slice(lastSlash + 1, i);

}

lastSlash = i;

dots = 0;

} else if (code === 46/*.*/ && dots !== -1) {

++dots;

} else {

dots = -1;

}

}

return res;

}

// Resolves . and .. elements in a path with directory names

function normalizeStringPosix(path, allowAboveRoot) {

var res = '';

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 ||

res.charCodeAt(res.length - 1) !== 46/*.*/ ||

res.charCodeAt(res.length - 2) !== 46/*.*/) {

if (res.length > 2) {

const start = res.length - 1;

var j = start;

for (; j >= 0; --j) {

if (res.charCodeAt(j) === 47/*/*/)

break;

}

if (j !== start) {

if (j === -1)

res = '';

else

res = res.slice(0, j);

lastSlash = i;

dots = 0;

continue;

}

} else if (res.length === 2 || res.length === 1) {

res = '';

lastSlash = i;

dots = 0;

continue;

}

}

if (allowAboveRoot) {

if (res.length > 0)

res += '/..';

else

res = '..';

}

} else {

if (res.length > 0)

res += '/' + path.slice(lastSlash + 1, i);

else

res = path.slice(lastSlash + 1, i);

}

lastSlash = i;

dots = 0;

} else if (code === 46/*.*/ && dots !== -1) {

++dots;

} else {

dots = -1;

}

}

return res;

}

function _format(sep, pathObject) {

const dir = pathObject.dir || pathObject.root;

const base = pathObject.base ||

((pathObject.name || '') + (pathObject.ext || ''));

if (!dir) {

return base;

}

if (dir === pathObject.root) {

return dir + base;

}

return dir + sep + base;

}

const win32 = {

// path.resolve([from ...], to)

resolve: function resolve() {

var resolvedDevice = '';

var resolvedTail = '';

var resolvedAbsolute = false;

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

var path;

if (i >= 0) {

path = arguments[i];

} else if (!resolvedDevice) {

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['=' + 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 ||

path.slice(0, 3).toLowerCase() !==

resolvedDevice.toLowerCase() + '\\') {

path = resolvedDevice + '\\';

}

}

assertPath(path);

// Skip empty entries

if (path.length === 0) {

continue;

}

var len = path.length;

var rootEnd = 0;

var code = path.charCodeAt(0);

var device = '';

var isAbsolute = false;

// Try to match a root

if (len > 1) {

if (code === 47/*/*/ || code === 92/*\*/) {

// 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;

code = path.charCodeAt(1);

if (code === 47/*/*/ || code === 92/*\*/) {

// Matched double path separator at beginning

var j = 2;

var last = j;

// Match 1 or more non-path separators

for (; j < len; ++j) {

code = path.charCodeAt(j);

if (code === 47/*/*/ || code === 92/*\*/)

break;

}

if (j < len && j !== last) {

const firstPart = path.slice(last, j);

// Matched!

last = j;

// Match 1 or more path separators

for (; j < len; ++j) {

code = path.charCodeAt(j);

if (code !== 47/*/*/ && code !== 92/*\*/)

break;

}

if (j < len && j !== last) {

// Matched!

last = j;

// Match 1 or more non-path separators

for (; j < len; ++j) {

code = path.charCodeAt(j);

if (code === 47/*/*/ || code === 92/*\*/)

break;

}

if (j === len) {

// We matched a UNC root only

device = '\\\\' + firstPart + '\\' + path.slice(last);

rootEnd = j;

} else if (j !== last) {

// We matched a UNC root with leftovers

device = '\\\\' + firstPart + '\\' + path.slice(last, j);

rootEnd = j;

}

}

}

} else {

rootEnd = 1;

}

} else if ((code >= 65/*A*/ && code <= 90/*Z*/) ||

(code >= 97/*a*/ && code <= 122/*z*/)) {

// Possible device root

code = path.charCodeAt(1);

if (path.charCodeAt(1) === 58/*:*/) {

device = path.slice(0, 2);

rootEnd = 2;

if (len > 2) {

code = path.charCodeAt(2);

if (code === 47/*/*/ || code === 92/*\*/) {

// Treat separator following drive name as an absolute path

// indicator

isAbsolute = true;

rootEnd = 3;

}

}

}

}

} else if (code === 47/*/*/ || code === 92/*\*/) {

// `path` contains just a path separator

rootEnd = 1;

isAbsolute = true;

}

if (device.length > 0 &&

resolvedDevice.length > 0 &&

device.toLowerCase() !== resolvedDevice.toLowerCase()) {

// This path points to another device so it is not applicable

continue;

}

if (resolvedDevice.length === 0 && device.length > 0) {

resolvedDevice = device;

}

if (!resolvedAbsolute) {

resolvedTail = path.slice(rootEnd) + '\\' + resolvedTail;

resolvedAbsolute = isAbsolute;

}

if (resolvedDevice.length > 0 && resolvedAbsolute) {

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 = normalizeStringWin32(resolvedTail, !resolvedAbsolute);

return (resolvedDevice + (resolvedAbsolute ? '\\' : '') + resolvedTail) ||

'.';

},

normalize: function normalize(path) {

assertPath(path);

const len = path.length;

if (len === 0)

return '.';

var rootEnd = 0;

var code = path.charCodeAt(0);

var device;

var isAbsolute = false;

// Try to match a root

if (len > 1) {

if (code === 47/*/*/ || code === 92/*\*/) {

// 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;

code = path.charCodeAt(1);

if (code === 47/*/*/ || code === 92/*\*/) {

// Matched double path separator at beginning

var j = 2;

var last = j;

// Match 1 or more non-path separators

for (; j < len; ++j) {

code = path.charCodeAt(j);

if (code === 47/*/*/ || code === 92/*\*/)

break;

}

if (j < len && j !== last) {

const firstPart = path.slice(last, j);

// Matched!

last = j;

// Match 1 or more path separators

for (; j < len; ++j) {

code = path.charCodeAt(j);

if (code !== 47/*/*/ && code !== 92/*\*/)

break;

}

if (j < len && j !== last) {

// Matched!

last = j;

// Match 1 or more non-path separators

for (; j < len; ++j) {

code = path.charCodeAt(j);

if (code === 47/*/*/ || code === 92/*\*/)

break;

}

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 '\\\\' + firstPart + '\\' + path.slice(last) + '\\';

} else if (j !== last) {

// We matched a UNC root with leftovers

device = '\\\\' + firstPart + '\\' + path.slice(last, j);

rootEnd = j;

}

}

}

} else {

rootEnd = 1;

}

} else if ((code >= 65/*A*/ && code <= 90/*Z*/) ||

(code >= 97/*a*/ && code <= 122/*z*/)) {

// Possible device root

code = path.charCodeAt(1);

if (path.charCodeAt(1) === 58/*:*/) {

device = path.slice(0, 2);

rootEnd = 2;

if (len > 2) {

code = path.charCodeAt(2);

if (code === 47/*/*/ || code === 92/*\*/) {

// Treat separator following drive name as an absolute path

// indicator

isAbsolute = true;

rootEnd = 3;

}

}

}

}

} else if (code === 47/*/*/ || code === 92/*\*/) {

// `path` contains just a path separator, exit early to avoid unnecessary

// work

return '\\';

}

code = path.charCodeAt(len - 1);

var trailingSeparator = (code === 47/*/*/ || code === 92/*\*/);

var tail;

if (rootEnd < len)

tail = normalizeStringWin32(path.slice(rootEnd), !isAbsolute);

else

tail = '';

if (tail.length === 0 && !isAbsolute)

tail = '.';

if (tail.length > 0 && trailingSeparator)

tail += '\\';

if (device === undefined) {

if (isAbsolute) {

if (tail.length > 0)

return '\\' + tail;

else

return '\\';

} else if (tail.length > 0) {

return tail;

} else {

return '';

}

} else {

if (isAbsolute) {

if (tail.length > 0)

return device + '\\' + tail;

else

return device + '\\';

} else if (tail.length > 0) {

return device + tail;

} else {

return device;

}

}

},

isAbsolute: function isAbsolute(path) {

assertPath(path);

const len = path.length;

if (len === 0)

return false;

var code = path.charCodeAt(0);

if (code === 47/*/*/ || code === 92/*\*/) {

return true;

} else if ((code >= 65/*A*/ && code <= 90/*Z*/) ||

(code >= 97/*a*/ && code <= 122/*z*/)) {

// Possible device root

if (len > 2 && path.charCodeAt(1) === 58/*:*/) {

code = path.charCodeAt(2);

if (code === 47/*/*/ || code === 92/*\*/)

return true;

}

}

return false;

},

join: function join() {

if (arguments.length === 0)

return '.';

var joined;

var firstPart;

for (var i = 0; i < arguments.length; ++i) {

var arg = arguments[i];

assertPath(arg);

if (arg.length > 0) {

if (joined === undefined)

joined = firstPart = arg;

else

joined += '\\' + arg;

}

}

if (joined === undefined)

return '.';

// Make sure that the joined path doesn't start with two slashes, because

// normalize() will mistake it for an UNC path then.

//

// This step is skipped when it is very clear that the user actually

// intended to point at an 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 an 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 firstPart = paths[0];

var needsReplace = true;

var slashCount = 0;

var code = firstPart.charCodeAt(0);

if (code === 47/*/*/ || code === 92/*\*/) {

++slashCount;

const firstLen = firstPart.length;

if (firstLen > 1) {

code = firstPart.charCodeAt(1);

if (code === 47/*/*/ || code === 92/*\*/) {

++slashCount;

if (firstLen > 2) {

code = firstPart.charCodeAt(2);

if (code === 47/*/*/ || code === 92/*\*/)

++slashCount;

else {

// We matched a UNC path in the first part

needsReplace = false;

}

}

}

}

}

if (needsReplace) {

// Find any more consecutive slashes we need to replace

for (; slashCount < joined.length; ++slashCount) {

code = joined.charCodeAt(slashCount);

if (code !== 47/*/*/ && code !== 92/*\*/)

break;

}

// Replace the slashes if needed

if (slashCount >= 2)

joined = '\\' + joined.slice(slashCount);

}

return win32.normalize(joined);

},

// It will solve the relative path from `from` to `to`, for instance:

// from = 'C:\\orandea\\test\\aaa'

// to = 'C:\\orandea\\impl\\bbb'

// The output of the function should be: '..\\..\\impl\\bbb'

relative: function relative(from, to) {

assertPath(from);

assertPath(to);

if (from === to)

return '';

var fromOrig = win32.resolve(from);

var toOrig = win32.resolve(to);

if (fromOrig === toOrig)

return '';

from = fromOrig.toLowerCase();

to = toOrig.toLowerCase();

if (from === to)

return '';

// Trim any leading backslashes

var fromStart = 0;

for (; fromStart < from.length; ++fromStart) {

if (from.charCodeAt(fromStart) !== 92/*\*/)

break;

}

// Trim trailing backslashes (applicable to UNC paths only)

var fromEnd = from.length;

for (; fromEnd - 1 > fromStart; --fromEnd) {

if (from.charCodeAt(fromEnd - 1) !== 92/*\*/)

break;

}

var fromLen = (fromEnd - fromStart);

// Trim any leading backslashes

var toStart = 0;

for (; toStart < to.length; ++toStart) {

if (to.charCodeAt(toStart) !== 92/*\*/)

break;

}

// Trim trailing backslashes (applicable to UNC paths only)

var toEnd = to.length;

for (; toEnd - 1 > toStart; --toEnd) {

if (to.charCodeAt(toEnd - 1) !== 92/*\*/)

break;

}

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) === 92/*\*/) {

// We get here if `from` is the exact base path for `to`.

// For example: from='C:\\foo\\bar'; to='C:\\foo\\bar\\baz'

return toOrig.slice(toStart + i + 1);

} else if (i === 2) {

// We get here if `from` is the device root.

// For example: from='C:\\'; to='C:\\foo'

return toOrig.slice(toStart + i);

}

}

if (fromLen > length) {

if (from.charCodeAt(fromStart + i) === 92/*\*/) {

// 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;

}

}

break;

}

var fromCode = from.charCodeAt(fromStart + i);

var toCode = to.charCodeAt(toStart + i);

if (fromCode !== toCode)

break;

else if (fromCode === 92/*\*/)

lastCommonSep = i;

}

// We found a mismatch before the first common path separator was seen, so

// return the original `to`.

if (i !== length && lastCommonSep === -1) {

return toOrig;

}

var out = '';

if (lastCommonSep === -1)

lastCommonSep = 0;

// 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) === 92/*\*/) {

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 + toOrig.slice(toStart + lastCommonSep, toEnd);

else {

toStart += lastCommonSep;

if (toOrig.charCodeAt(toStart) === 92/*\*/)

++toStart;

return toOrig.slice(toStart, toEnd);

}

},

_makeLong: function _makeLong(path) {

// Note: this will *probably* throw somewhere.

if (typeof path !== 'string')

return path;

if (path.length === 0) {

return '';

}

const resolvedPath = win32.resolve(path);

if (resolvedPath.length >= 3) {

var code = resolvedPath.charCodeAt(0);

if (code === 92/*\*/) {

// Possible UNC root

if (resolvedPath.charCodeAt(1) === 92/*\*/) {

code = resolvedPath.charCodeAt(2);

if (code !== 63/*?*/ && code !== 46/*.*/) {

// Matched non-long UNC root, convert the path to a long UNC path

return '\\\\?\\UNC\\' + resolvedPath.slice(2);

}

}

} else if ((code >= 65/*A*/ && code <= 90/*Z*/) ||

(code >= 97/*a*/ && code <= 122/*z*/)) {

// Possible device root

if (resolvedPath.charCodeAt(1) === 58/*:*/ &&

resolvedPath.charCodeAt(2) === 92/*\*/) {

// Matched device root, convert the path to a long UNC path

return '\\\\?\\' + resolvedPath;

}

}

}

return path;

},

dirname: function dirname(path) {

assertPath(path);

const len = path.length;

if (len === 0)

return '.';

var rootEnd = -1;

var end = -1;

var matchedSlash = true;

var offset = 0;

var code = path.charCodeAt(0);

// Try to match a root

if (len > 1) {

if (code === 47/*/*/ || code === 92/*\*/) {

// Possible UNC root

rootEnd = offset = 1;

code = path.charCodeAt(1);

if (code === 47/*/*/ || code === 92/*\*/) {

// Matched double path separator at beginning

var j = 2;

var last = j;

// Match 1 or more non-path separators

for (; j < len; ++j) {

code = path.charCodeAt(j);

if (code === 47/*/*/ || code === 92/*\*/)

break;

}

if (j < len && j !== last) {

// Matched!

last = j;

// Match 1 or more path separators

for (; j < len; ++j) {

code = path.charCodeAt(j);

if (code !== 47/*/*/ && code !== 92/*\*/)

break;

}

if (j < len && j !== last) {

// Matched!

last = j;

// Match 1 or more non-path separators

for (; j < len; ++j) {

code = path.charCodeAt(j);

if (code === 47/*/*/ || code === 92/*\*/)

break;

}

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;

}

}

}

}

} else if ((code >= 65/*A*/ && code <= 90/*Z*/) ||

(code >= 97/*a*/ && code <= 122/*z*/)) {

// Possible device root

code = path.charCodeAt(1);

if (path.charCodeAt(1) === 58/*:*/) {

rootEnd = offset = 2;

if (len > 2) {

code = path.charCodeAt(2);

if (code === 47/*/*/ || code === 92/*\*/)

rootEnd = offset = 3;

}

}

}

} else if (code === 47/*/*/ || code === 92/*\*/) {

return path[0];

}

for (var i = len - 1; i >= offset; --i) {

code = path.charCodeAt(i);

if (code === 47/*/*/ || code === 92/*\*/) {

if (!matchedSlash) {

end = i;

break;

}

} else {

// We saw the first non-path separator

matchedSlash = false;

}

}

if (end === -1) {

if (rootEnd === -1)

return '.';

else

end = rootEnd;

}

return path.slice(0, end);

},

basename: function basename(path, ext) {

if (ext !== undefined && typeof ext !== 'string')

throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'ext', 'string');

assertPath(path);

var start = 0;

var end = -1;

var matchedSlash = true;

var i;

// 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) {

const drive = path.charCodeAt(0);

if ((drive >= 65/*A*/ && drive <= 90/*Z*/) ||

(drive >= 97/*a*/ && drive <= 122/*z*/)) {

if (path.charCodeAt(1) === 58/*:*/)

start = 2;

}

}

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 >= start; --i) {

const code = path.charCodeAt(i);

if (code === 47/*/*/ || code === 92/*\*/) {

// 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 >= start; --i) {

const code = path.charCodeAt(i);

if (code === 47/*/*/ || code === 92/*\*/) {

// 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) {

const code = path.charCodeAt(i);

if (code === 47/*/*/ || code === 92/*\*/) {

// 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)) {

return '';

}

return path.slice(startDot, end);

},

format: function format(pathObject) {

if (pathObject === null || typeof pathObject !== 'object') {

throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'pathObject', 'Object',

typeof pathObject);

}

return _format('\\', pathObject);

},

parse: function parse(path) {

assertPath(path);

var ret = { root: '', dir: '', base: '', ext: '', name: '' };

if (path.length === 0)

return ret;

var len = path.length;

var rootEnd = 0;

var code = path.charCodeAt(0);

var isAbsolute = false;

// Try to match a root

if (len > 1) {

if (code === 47/*/*/ || code === 92/*\*/) {

// Possible UNC root

isAbsolute = true;

code = path.charCodeAt(1);

rootEnd = 1;

if (code === 47/*/*/ || code === 92/*\*/) {

// Matched double path separator at beginning

var j = 2;

var last = j;

// Match 1 or more non-path separators

for (; j < len; ++j) {

code = path.charCodeAt(j);

if (code === 47/*/*/ || code === 92/*\*/)

break;

}

if (j < len && j !== last) {