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path.js
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path.js
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// 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 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/*/*/ || 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 || lastSegmentLength !== 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 = '';
lastSegmentLength = 0;
} else {
res = res.slice(0, j);
lastSegmentLength = j;
}
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;
}
// 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) {
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 = '';
lastSegmentLength = 0;
} else {
res = res.slice(0, j);
lastSegmentLength = j;
}
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;
}
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);
}
},
toNamespacedPath: function toNamespacedPath(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/*\*/) {
// `path` contains just a path separator, exit early to avoid
// unnecessary work
return path;
}
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 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) {
const code = path.charCodeAt(0);
if (path.charCodeAt(1) === 58/*:*/ &&
((code >= 65/*A*/ && code <= 90/*Z*/) ||
(code >= 97/*a*/ && code <= 122/*z*/))) {
start = startPart = 2;
}
}
for (var 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) {
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',
pathObject);
}
return _format('\\', pathObject);
},
parse: function parse(path) {
assertPath(path);