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path.js
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1713 lines (1557 loc) · 51.5 KB
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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 {
ArrayPrototypeIncludes,
ArrayPrototypeJoin,
ArrayPrototypePush,
ArrayPrototypeSlice,
FunctionPrototypeBind,
StringPrototypeCharCodeAt,
StringPrototypeIncludes,
StringPrototypeIndexOf,
StringPrototypeLastIndexOf,
StringPrototypeRepeat,
StringPrototypeReplace,
StringPrototypeSlice,
StringPrototypeSplit,
StringPrototypeToLowerCase,
StringPrototypeToUpperCase,
} = primordials;
const {
CHAR_UPPERCASE_A,
CHAR_LOWERCASE_A,
CHAR_UPPERCASE_Z,
CHAR_LOWERCASE_Z,
CHAR_DOT,
CHAR_FORWARD_SLASH,
CHAR_BACKWARD_SLASH,
CHAR_COLON,
CHAR_QUESTION_MARK,
} = require('internal/constants');
const {
validateObject,
validateString,
} = require('internal/validators');
const {
isWindows,
getLazy,
} = require('internal/util');
const lazyMatchGlobPattern = getLazy(() => require('internal/fs/glob').matchGlobPattern);
function isPathSeparator(code) {
return code === CHAR_FORWARD_SLASH || code === CHAR_BACKWARD_SLASH;
}
function isPosixPathSeparator(code) {
return code === CHAR_FORWARD_SLASH;
}
const WINDOWS_RESERVED_NAMES = [
'CON', 'PRN', 'AUX', 'NUL',
'COM1', 'COM2', 'COM3', 'COM4', 'COM5', 'COM6', 'COM7', 'COM8', 'COM9',
'LPT1', 'LPT2', 'LPT3', 'LPT4', 'LPT5', 'LPT6', 'LPT7', 'LPT8', 'LPT9',
'COM\xb9', 'COM\xb2', 'COM\xb3',
'LPT\xb9', 'LPT\xb2', 'LPT\xb3',
];
function isWindowsReservedName(path, colonIndex) {
const devicePart = StringPrototypeToUpperCase(StringPrototypeSlice(path, 0, colonIndex));
return ArrayPrototypeIncludes(WINDOWS_RESERVED_NAMES, devicePart);
}
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) {
let res = '';
let lastSegmentLength = 0;
let lastSlash = -1;
let dots = 0;
let code = 0;
for (let 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) {
const lastSlashIndex = res.length - lastSegmentLength - 1;
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 ? `${separator}..` : '..';
lastSegmentLength = 2;
}
} else {
if (res.length > 0)
res += `${separator}${StringPrototypeSlice(path, lastSlash + 1, i)}`;
else
res = StringPrototypeSlice(path, lastSlash + 1, i);
lastSegmentLength = i - lastSlash - 1;
}
lastSlash = i;
dots = 0;
} else if (code === CHAR_DOT && dots !== -1) {
++dots;
} else {
dots = -1;
}
}
return res;
}
function formatExt(ext) {
return ext ? `${ext[0] === '.' ? '' : '.'}${ext}` : '';
}
/**
* @param {string} sep
* @param {{
* dir?: string;
* root?: string;
* base?: string;
* name?: string;
* ext?: string;
* }} pathObject
* @returns {string}
*/
function _format(sep, pathObject) {
validateObject(pathObject, 'pathObject');
const dir = pathObject.dir || pathObject.root;
const base = pathObject.base ||
`${pathObject.name || ''}${formatExt(pathObject.ext)}`;
if (!dir) {
return base;
}
return dir === pathObject.root ? `${dir}${base}` : `${dir}${sep}${base}`;
}
const forwardSlashRegExp = /\//g;
const win32 = {
/**
* path.resolve([from ...], to)
* @param {...string} args
* @returns {string}
*/
resolve(...args) {
let resolvedDevice = '';
let resolvedTail = '';
let resolvedAbsolute = false;
for (let i = args.length - 1; i >= -1; i--) {
let path;
if (i >= 0) {
path = args[i];
validateString(path, `paths[${i}]`);
// Skip empty entries
if (path.length === 0) {
continue;
}
} else if (resolvedDevice.length === 0) {
path = process.cwd();
// Fast path for current directory
if (args.length === 0 || ((args.length === 1 && (args[0] === '' || args[0] === '.')) &&
isPathSeparator(StringPrototypeCharCodeAt(path, 0)))) {
if (!isWindows) {
path = StringPrototypeReplace(path, forwardSlashRegExp, '\\');
}
return path;
}
} else {
// Windows has the concept of drive-specific current working
// directories. If we've resolved a drive letter but not yet an
// absolute path, get cwd for that drive, or the process cwd if
// the drive cwd is not available. We're sure the device is not
// a UNC path at this points, because UNC paths are always absolute.
path = process.env[`=${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 ||
(StringPrototypeToLowerCase(StringPrototypeSlice(path, 0, 2)) !==
StringPrototypeToLowerCase(resolvedDevice) &&
StringPrototypeCharCodeAt(path, 2) === CHAR_BACKWARD_SLASH)) {
path = `${resolvedDevice}\\`;
}
}
const len = path.length;
let rootEnd = 0;
let device = '';
let isAbsolute = false;
const code = StringPrototypeCharCodeAt(path, 0);
// Try to match a root
if (len === 1) {
if (isPathSeparator(code)) {
// `path` contains just a path separator
rootEnd = 1;
isAbsolute = true;
}
} else if (isPathSeparator(code)) {
// Possible UNC root
// If we started with a separator, we know we at least have an
// absolute path of some kind (UNC or otherwise)
isAbsolute = true;
if (isPathSeparator(StringPrototypeCharCodeAt(path, 1))) {
// Matched double path separator at beginning
let j = 2;
let last = j;
// Match 1 or more non-path separators
while (j < len &&
!isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
j++;
}
if (j < len && j !== last) {
const firstPart = StringPrototypeSlice(path, last, j);
// Matched!
last = j;
// Match 1 or more path separators
while (j < len &&
isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more non-path separators
while (j < len &&
!isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
j++;
}
if (j === len || j !== last) {
if (firstPart !== '.' && firstPart !== '?') {
// We matched a UNC root
device =
`\\\\${firstPart}\\${StringPrototypeSlice(path, last, j)}`;
rootEnd = j;
} else {
// We matched a device root (e.g. \\\\.\\PHYSICALDRIVE0)
device = `\\\\${firstPart}`;
rootEnd = 4;
}
}
}
}
} 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 =
`${StringPrototypeSlice(path, rootEnd)}\\${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 ?
`${resolvedDevice}\\${resolvedTail}` :
`${resolvedDevice}${resolvedTail}` || '.';
},
/**
* @param {string} path
* @returns {string}
*/
normalize(path) {
validateString(path, 'path');
const len = path.length;
if (len === 0)
return '.';
let rootEnd = 0;
let device;
let isAbsolute = false;
const 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
let j = 2;
let last = j;
// Match 1 or more non-path separators
while (j < len &&
!isPathSeparator(StringPrototypeCharCodeAt(path, j))) {
j++;
}
if (j < len && j !== last) {
const 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) {
if (firstPart === '.' || firstPart === '?') {
// We matched a device root (e.g. \\\\.\\PHYSICALDRIVE0)
device = `\\\\${firstPart}`;
rootEnd = 4;
const colonIndex = StringPrototypeIndexOf(path, ':');
// Special case: handle \\?\COM1: or similar reserved device paths
const possibleDevice = StringPrototypeSlice(path, 4, colonIndex + 1);
if (isWindowsReservedName(possibleDevice, possibleDevice.length - 1)) {
device = `\\\\?\\${possibleDevice}`;
rootEnd = 4 + possibleDevice.length;
}
} else 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}\\${StringPrototypeSlice(path, last)}\\`;
} else {
// We matched a UNC root with leftovers
device =
`\\\\${firstPart}\\${StringPrototypeSlice(path, last, j)}`;
rootEnd = j;
}
}
}
}
} else {
rootEnd = 1;
}
} else {
const colonIndex = StringPrototypeIndexOf(path, ':');
if (colonIndex > 0) {
if (isWindowsDeviceRoot(code) && colonIndex === 1) {
device = StringPrototypeSlice(path, 0, 2);
rootEnd = 2;
if (len > 2 && isPathSeparator(StringPrototypeCharCodeAt(path, 2))) {
isAbsolute = true;
rootEnd = 3;
}
} else if (isWindowsReservedName(path, colonIndex)) {
device = StringPrototypeSlice(path, 0, colonIndex + 1);
rootEnd = colonIndex + 1;
}
}
}
let 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 (!isAbsolute && device === undefined && StringPrototypeIncludes(path, ':')) {
// If the original path was not absolute and if we have not been able to
// resolve it relative to a particular device, we need to ensure that the
// `tail` has not become something that Windows might interpret as an
// absolute path. See CVE-2024-36139.
if (tail.length >= 2 &&
isWindowsDeviceRoot(StringPrototypeCharCodeAt(tail, 0)) &&
StringPrototypeCharCodeAt(tail, 1) === CHAR_COLON) {
return `.\\${tail}`;
}
let index = StringPrototypeIndexOf(path, ':');
do {
if (index === len - 1 || isPathSeparator(StringPrototypeCharCodeAt(path, index + 1))) {
return `.\\${tail}`;
}
} while ((index = StringPrototypeIndexOf(path, ':', index + 1)) !== -1);
}
const colonIndex = StringPrototypeIndexOf(path, ':');
if (isWindowsReservedName(path, colonIndex)) {
return `.\\${device ?? ''}${tail}`;
}
if (device === undefined) {
return isAbsolute ? `\\${tail}` : tail;
}
return isAbsolute ? `${device}\\${tail}` : `${device}${tail}`;
},
/**
* @param {string} path
* @returns {boolean}
*/
isAbsolute(path) {
validateString(path, 'path');
const len = path.length;
if (len === 0)
return false;
const 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(...args) {
if (args.length === 0)
return '.';
const path = [];
for (let i = 0; i < args.length; ++i) {
const arg = args[i];
validateString(arg, 'path');
if (arg.length > 0) {
ArrayPrototypePush(path, arg);
}
}
if (path.length === 0)
return '.';
const firstPart = path[0];
let joined = ArrayPrototypeJoin(path, '\\');
// 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\\')
let needsReplace = true;
let slashCount = 0;
if (isPathSeparator(StringPrototypeCharCodeAt(firstPart, 0))) {
++slashCount;
const 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 = `\\${StringPrototypeSlice(joined, slashCount)}`;
}
// Skip normalization when reserved device names are present
const parts = [];
let part = '';
for (let i = 0; i < joined.length; i++) {
if (joined[i] === '\\') {
if (part) parts.push(part);
part = '';
// Skip consecutive backslashes
while (i + 1 < joined.length && joined[i + 1] === '\\') i++;
} else {
part += joined[i];
}
}
// Add the final part if any
if (part) parts.push(part);
// Check if any part has a Windows reserved name
if (parts.some((p) => {
const colonIndex = StringPrototypeIndexOf(p, ':');
return colonIndex !== -1 && isWindowsReservedName(p, colonIndex);
})) {
// Replace forward slashes with backslashes
let result = '';
for (let i = 0; i < joined.length; i++) {
result += joined[i] === '/' ? '\\' : joined[i];
}
return result;
}
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'
* @param {string} from
* @param {string} to
* @returns {string}
*/
relative(from, to) {
validateString(from, 'from');
validateString(to, 'to');
if (from === to)
return '';
const fromOrig = win32.resolve(from);
const toOrig = win32.resolve(to);
if (fromOrig === toOrig)
return '';
from = StringPrototypeToLowerCase(fromOrig);
to = StringPrototypeToLowerCase(toOrig);
if (from === to)
return '';
if (fromOrig.length !== from.length || toOrig.length !== to.length) {
const fromSplit = StringPrototypeSplit(fromOrig, '\\');
const toSplit = StringPrototypeSplit(toOrig, '\\');
if (fromSplit[fromSplit.length - 1] === '') {
fromSplit.pop();
}
if (toSplit[toSplit.length - 1] === '') {
toSplit.pop();
}
const fromLen = fromSplit.length;
const toLen = toSplit.length;
const length = fromLen < toLen ? fromLen : toLen;
let i;
for (i = 0; i < length; i++) {
if (StringPrototypeToLowerCase(fromSplit[i]) !== StringPrototypeToLowerCase(toSplit[i])) {
break;
}
}
if (i === 0) {
return toOrig;
} else if (i === length) {
if (toLen > length) {
return ArrayPrototypeJoin(ArrayPrototypeSlice(toSplit, i), '\\');
}
if (fromLen > length) {
return StringPrototypeRepeat('..\\', fromLen - 1 - i) + '..';
}
return '';
}
return StringPrototypeRepeat('..\\', fromLen - i) + ArrayPrototypeJoin(ArrayPrototypeSlice(toSplit, i), '\\');
}
// Trim any leading backslashes
let fromStart = 0;
while (fromStart < from.length &&
StringPrototypeCharCodeAt(from, fromStart) === CHAR_BACKWARD_SLASH) {
fromStart++;
}
// Trim trailing backslashes (applicable to UNC paths only)
let fromEnd = from.length;
while (
fromEnd - 1 > fromStart &&
StringPrototypeCharCodeAt(from, fromEnd - 1) === CHAR_BACKWARD_SLASH
) {
fromEnd--;
}
const fromLen = fromEnd - fromStart;
// Trim any leading backslashes
let toStart = 0;
while (toStart < to.length &&
StringPrototypeCharCodeAt(to, toStart) === CHAR_BACKWARD_SLASH) {
toStart++;
}
// Trim trailing backslashes (applicable to UNC paths only)
let toEnd = to.length;
while (toEnd - 1 > toStart &&
StringPrototypeCharCodeAt(to, toEnd - 1) === CHAR_BACKWARD_SLASH) {
toEnd--;
}
const toLen = toEnd - toStart;
// Compare paths to find the longest common path from root
const length = fromLen < toLen ? fromLen : toLen;
let lastCommonSep = -1;
let i = 0;
for (; i < length; i++) {
const 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;
}
let 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 `${out}${StringPrototypeSlice(toOrig, toStart, toEnd)}`;
if (StringPrototypeCharCodeAt(toOrig, toStart) === CHAR_BACKWARD_SLASH)
++toStart;
return StringPrototypeSlice(toOrig, toStart, toEnd);
},
/**
* @param {string} path
* @returns {string}
*/
toNamespacedPath(path) {
// Note: this will *probably* throw somewhere.
if (typeof path !== 'string' || path.length === 0)
return path;
const 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) {
const 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\\${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 `\\\\?\\${resolvedPath}`;
}
return resolvedPath;
},
/**
* @param {string} path
* @returns {string}
*/
dirname(path) {
validateString(path, 'path');
const len = path.length;
if (len === 0)
return '.';
let rootEnd = -1;
let offset = 0;
const 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
let j = 2;
let 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;
}
let end = -1;
let matchedSlash = true;
for (let 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} [suffix]
* @returns {string}
*/
basename(path, suffix) {
if (suffix !== undefined)
validateString(suffix, 'suffix');
validateString(path, 'path');
let start = 0;
let end = -1;
let 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 (suffix !== undefined && suffix.length > 0 && suffix.length <= path.length) {
if (suffix === path)
return '';
let extIdx = suffix.length - 1;
let firstNonSlashEnd = -1;
for (let i = path.length - 1; i >= start; --i) {
const 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(suffix, 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 (let 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(path) {
validateString(path, 'path');
let start = 0;
let startDot = -1;
let startPart = 0;
let end = -1;
let matchedSlash = true;
// Track the state of characters (if any) we see before our first dot and
// after any path separator we find
let 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