current/lib/path.js
// 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 { ERR_INVALID_ARG_TYPE } = require('internal/errors').codes;
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 { validateString } = require('internal/validators');
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) {
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 = path.charCodeAt(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 ||
res.charCodeAt(res.length - 1) !== CHAR_DOT ||
res.charCodeAt(res.length - 2) !== CHAR_DOT) {
if (res.length > 2) {
const lastSlashIndex = res.lastIndexOf(separator);
if (lastSlashIndex === -1) {
res = '';
lastSegmentLength = 0;
} else {
res = res.slice(0, lastSlashIndex);
lastSegmentLength = res.length - 1 - res.lastIndexOf(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}${path.slice(lastSlash + 1, i)}`;
else
res = path.slice(lastSlash + 1, i);
lastSegmentLength = i - lastSlash - 1;
}
lastSlash = i;
dots = 0;
} else if (code === CHAR_DOT && dots !== -1) {
++dots;
} else {
dots = -1;
}
}
return res;
}
function _format(sep, pathObject) {
if (pathObject === null || typeof pathObject !== 'object') {
throw new ERR_INVALID_ARG_TYPE('pathObject', 'Object', pathObject);
}
const dir = pathObject.dir || pathObject.root;
const base = pathObject.base ||
`${pathObject.name || ''}${pathObject.ext || ''}`;
if (!dir) {
return base;
}
return dir === pathObject.root ? `${dir}${base}` : `${dir}${sep}${base}`;
}
const win32 = {
// path.resolve([from ...], to)
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, '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[`=${resolvedDevice}`] || process.cwd();
// Verify that a cwd was found and that it actually points
// to our drive. If not, default to the drive's root.
if (path === undefined ||
(path.slice(0, 2).toLowerCase() !== resolvedDevice.toLowerCase() &&
path.charCodeAt(2) === CHAR_BACKWARD_SLASH)) {
path = `${resolvedDevice}\\`;
}
}
const len = path.length;
let rootEnd = 0;
let device = '';
let isAbsolute = false;
const code = path.charCodeAt(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(path.charCodeAt(1))) {
// Matched double path separator at beginning
let j = 2;
let last = j;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
const firstPart = path.slice(last, j);
// Matched!
last = j;
// Match 1 or more path separators
while (j < len && isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j === len || j !== last) {
// We matched a UNC root
device = `\\\\${firstPart}\\${path.slice(last, j)}`;
rootEnd = j;
}
}
}
} else {
rootEnd = 1;
}
} else if (isWindowsDeviceRoot(code) &&
path.charCodeAt(1) === CHAR_COLON) {
// Possible device root
device = path.slice(0, 2);
rootEnd = 2;
if (len > 2 && isPathSeparator(path.charCodeAt(2))) {
// Treat separator following drive name as an absolute path
// indicator
isAbsolute = true;
rootEnd = 3;
}
}
if (device.length > 0) {
if (resolvedDevice.length > 0) {
if (device.toLowerCase() !== resolvedDevice.toLowerCase())
// This path points to another device so it is not applicable
continue;
} else {
resolvedDevice = device;
}
}
if (resolvedAbsolute) {
if (resolvedDevice.length > 0)
break;
} else {
resolvedTail = `${path.slice(rootEnd)}\\${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}` || '.';
},
normalize(path) {
validateString(path, 'path');
const len = path.length;
if (len === 0)
return '.';
let rootEnd = 0;
let device;
let isAbsolute = false;
const code = path.charCodeAt(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(path.charCodeAt(1))) {
// Matched double path separator at beginning
let j = 2;
let last = j;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
const firstPart = path.slice(last, j);
// Matched!
last = j;
// Match 1 or more path separators
while (j < len && isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(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 `\\\\${firstPart}\\${path.slice(last)}\\`;
}
if (j !== last) {
// We matched a UNC root with leftovers
device = `\\\\${firstPart}\\${path.slice(last, j)}`;
rootEnd = j;
}
}
}
} else {
rootEnd = 1;
}
} else if (isWindowsDeviceRoot(code) && path.charCodeAt(1) === CHAR_COLON) {
// Possible device root
device = path.slice(0, 2);
rootEnd = 2;
if (len > 2 && isPathSeparator(path.charCodeAt(2))) {
// Treat separator following drive name as an absolute path
// indicator
isAbsolute = true;
rootEnd = 3;
}
}
let tail = rootEnd < len ?
normalizeString(path.slice(rootEnd), !isAbsolute, '\\', isPathSeparator) :
'';
if (tail.length === 0 && !isAbsolute)
tail = '.';
if (tail.length > 0 && isPathSeparator(path.charCodeAt(len - 1)))
tail += '\\';
if (device === undefined) {
return isAbsolute ? `\\${tail}` : tail;
}
return isAbsolute ? `${device}\\${tail}` : `${device}${tail}`;
},
isAbsolute(path) {
validateString(path, 'path');
const len = path.length;
if (len === 0)
return false;
const code = path.charCodeAt(0);
return isPathSeparator(code) ||
// Possible device root
(len > 2 &&
isWindowsDeviceRoot(code) &&
path.charCodeAt(1) === CHAR_COLON &&
isPathSeparator(path.charCodeAt(2)));
},
join(...args) {
if (args.length === 0)
return '.';
let joined;
let firstPart;
for (let i = 0; i < args.length; ++i) {
const arg = args[i];
validateString(arg, 'path');
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 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(firstPart.charCodeAt(0))) {
++slashCount;
const firstLen = firstPart.length;
if (firstLen > 1 && isPathSeparator(firstPart.charCodeAt(1))) {
++slashCount;
if (firstLen > 2) {
if (isPathSeparator(firstPart.charCodeAt(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(joined.charCodeAt(slashCount))) {
slashCount++;
}
// 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(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 = fromOrig.toLowerCase();
to = toOrig.toLowerCase();
if (from === to)
return '';
// Trim any leading backslashes
let fromStart = 0;
while (fromStart < from.length &&
from.charCodeAt(fromStart) === CHAR_BACKWARD_SLASH) {
fromStart++;
}
// Trim trailing backslashes (applicable to UNC paths only)
let fromEnd = from.length;
while (fromEnd - 1 > fromStart &&
from.charCodeAt(fromEnd - 1) === CHAR_BACKWARD_SLASH) {
fromEnd--;
}
const fromLen = fromEnd - fromStart;
// Trim any leading backslashes
let toStart = 0;
while (toStart < to.length &&
to.charCodeAt(toStart) === CHAR_BACKWARD_SLASH) {
toStart++;
}
// Trim trailing backslashes (applicable to UNC paths only)
let toEnd = to.length;
while (toEnd - 1 > toStart &&
to.charCodeAt(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 = from.charCodeAt(fromStart + i);
if (fromCode !== to.charCodeAt(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 (to.charCodeAt(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 toOrig.slice(toStart + i + 1);
}
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) === 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 || from.charCodeAt(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 `${out}${toOrig.slice(toStart, toEnd)}`;
if (toOrig.charCodeAt(toStart) === CHAR_BACKWARD_SLASH)
++toStart;
return toOrig.slice(toStart, toEnd);
},
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 <= 2)
return path;
if (resolvedPath.charCodeAt(0) === CHAR_BACKWARD_SLASH) {
// Possible UNC root
if (resolvedPath.charCodeAt(1) === CHAR_BACKWARD_SLASH) {
const code = resolvedPath.charCodeAt(2);
if (code !== CHAR_QUESTION_MARK && code !== CHAR_DOT) {
// Matched non-long UNC root, convert the path to a long UNC path
return `\\\\?\\UNC\\${resolvedPath.slice(2)}`;
}
}
} else if (isWindowsDeviceRoot(resolvedPath.charCodeAt(0)) &&
resolvedPath.charCodeAt(1) === CHAR_COLON &&
resolvedPath.charCodeAt(2) === CHAR_BACKWARD_SLASH) {
// Matched device root, convert the path to a long UNC path
return `\\\\?\\${resolvedPath}`;
}
return path;
},
dirname(path) {
validateString(path, 'path');
const len = path.length;
if (len === 0)
return '.';
let rootEnd = -1;
let offset = 0;
const code = path.charCodeAt(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(path.charCodeAt(1))) {
// Matched double path separator at beginning
let j = 2;
let last = j;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more path separators
while (j < len && isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(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) && path.charCodeAt(1) === CHAR_COLON) {
rootEnd = len > 2 && isPathSeparator(path.charCodeAt(2)) ? 3 : 2;
offset = rootEnd;
}
let end = -1;
let matchedSlash = true;
for (let i = len - 1; i >= offset; --i) {
if (isPathSeparator(path.charCodeAt(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 path.slice(0, end);
},
basename(path, ext) {
if (ext !== undefined)
validateString(ext, 'ext');
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(path.charCodeAt(0)) &&
path.charCodeAt(1) === CHAR_COLON) {
start = 2;
}
if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
if (ext === path)
return '';
let extIdx = ext.length - 1;
let firstNonSlashEnd = -1;
for (let i = path.length - 1; i >= start; --i) {
const code = path.charCodeAt(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 === 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);
}
for (let i = path.length - 1; i >= start; --i) {
if (isPathSeparator(path.charCodeAt(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 path.slice(start, end);
},
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
if (path.length >= 2 &&
path.charCodeAt(1) === CHAR_COLON &&
isWindowsDeviceRoot(path.charCodeAt(0))) {
start = startPart = 2;
}
for (let i = path.length - 1; i >= start; --i) {
const code = path.charCodeAt(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 path.slice(startDot, end);
},
format: _format.bind(null, '\\'),
parse(path) {
validateString(path, 'path');
const ret = { root: '', dir: '', base: '', ext: '', name: '' };
if (path.length === 0)
return ret;
const len = path.length;
let rootEnd = 0;
let code = path.charCodeAt(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(path.charCodeAt(1))) {
// Matched double path separator at beginning
let j = 2;
let last = j;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more path separators
while (j < len && isPathSeparator(path.charCodeAt(j))) {
j++;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more non-path separators
while (j < len && !isPathSeparator(path.charCodeAt(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) && path.charCodeAt(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(path.charCodeAt(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 = path.slice(0, rootEnd);
let startDot = -1;
let startPart = rootEnd;
let end = -1;
let matchedSlash = true;
let i = path.length - 1;
// Track the state of characters (if any) we see before our first dot and
// after any path separator we find
let preDotState = 0;
// Get non-dir info
for (; i >= rootEnd; --i) {
code = path.charCodeAt(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 = path.slice(startPart, end);
} else {
ret.name = path.slice(startPart, startDot);
ret.base = path.slice(startPart, end);
ret.ext = path.slice(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 = path.slice(0, startPart - 1);
else
ret.dir = ret.root;
return ret;
},
sep: '\\',
delimiter: ';',
win32: null,
posix: null
};
const posix = {
// path.resolve([from ...], to)
resolve(...args) {
let resolvedPath = '';
let resolvedAbsolute = false;
for (let i = args.length - 1; i >= -1 && !resolvedAbsolute; i--) {
const path = i >= 0 ? args[i] : process.cwd();
validateString(path, 'path');
// Skip empty entries
if (path.length === 0) {
continue;
}
resolvedPath = `${path}/${resolvedPath}`;
resolvedAbsolute = path.charCodeAt(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 `/${resolvedPath}`;
}
return resolvedPath.length > 0 ? resolvedPath : '.';
},
normalize(path) {
validateString(path, 'path');
if (path.length === 0)
return '.';
const isAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
const trailingSeparator =
path.charCodeAt(path.length - 1) === CHAR_FORWARD_SLASH;
// Normalize the path
path = normalizeString(path, !isAbsolute, '/', isPosixPathSeparator);
if (path.length === 0) {
if (isAbsolute)
return '/';
return trailingSeparator ? './' : '.';
}
if (trailingSeparator)
path += '/';
return isAbsolute ? `/${path}` : path;
},
isAbsolute(path) {
validateString(path, 'path');
return path.length > 0 && path.charCodeAt(0) === CHAR_FORWARD_SLASH;
},
join(...args) {
if (args.length === 0)
return '.';
let joined;
for (let i = 0; i < args.length; ++i) {
const arg = args[i];
validateString(arg, 'path');
if (arg.length > 0) {
if (joined === undefined)
joined = arg;
else
joined += `/${arg}`;
}
}
if (joined === undefined)
return '.';
return posix.normalize(joined);
},
relative(from, to) {
validateString(from, 'from');
validateString(to, 'to');
if (from === to)
return '';
// Trim leading forward slashes.
from = posix.resolve(from);
to = posix.resolve(to);
if (from === to)
return '';
const fromStart = 1;
const fromEnd = from.length;
const fromLen = fromEnd - fromStart;
const toStart = 1;
const toLen = to.length - toStart;
// Compare paths to find the longest common path from root
const length = (fromLen < toLen ? fromLen : toLen);
let lastCommonSep = -1;
let i = 0;
for (; i < length; i++) {
const fromCode = from.charCodeAt(fromStart + i);
if (fromCode !== to.charCodeAt(toStart + i))
break;
else if (fromCode === CHAR_FORWARD_SLASH)
lastCommonSep = i;
}
if (i === length) {
if (toLen > length) {
if (to.charCodeAt(toStart + i) === CHAR_FORWARD_SLASH) {
// We get here if `from` is the exact base path for `to`.
// For example: from='/foo/bar'; to='/foo/bar/baz'
return to.slice(toStart + i + 1);
}
if (i === 0) {
// We get here if `from` is the root
// For example: from='/'; to='/foo'
return to.slice(toStart + i);
}
} else if (fromLen > length) {
if (from.charCodeAt(fromStart + i) === CHAR_FORWARD_SLASH) {
// We get here if `to` is the exact base path for `from`.
// For example: from='/foo/bar/baz'; to='/foo/bar'
lastCommonSep = i;
} else if (i === 0) {
// We get here if `to` is the root.
// For example: from='/foo/bar'; to='/'
lastCommonSep = 0;
}
}
}
let out = '';
// Generate the relative path based on the path difference between `to`
// and `from`.
for (i = fromStart + lastCommonSep + 1; i <= fromEnd; ++i) {
if (i === fromEnd || from.charCodeAt(i) === CHAR_FORWARD_SLASH) {
out += out.length === 0 ? '..' : '/..';
}
}
// Lastly, append the rest of the destination (`to`) path that comes after
// the common path parts.
return `${out}${to.slice(toStart + lastCommonSep)}`;
},
toNamespacedPath(path) {
// Non-op on posix systems
return path;
},
dirname(path) {
validateString(path, 'path');
if (path.length === 0)
return '.';
const hasRoot = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
let end = -1;
let matchedSlash = true;
for (let i = path.length - 1; i >= 1; --i) {
if (path.charCodeAt(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 path.slice(0, end);
},
basename(path, ext) {
if (ext !== undefined)
validateString(ext, 'ext');
validateString(path, 'path');
let start = 0;
let end = -1;
let matchedSlash = true;
if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
if (ext === path)
return '';
let extIdx = ext.length - 1;
let firstNonSlashEnd = -1;
for (let i = path.length - 1; i >= 0; --i) {
const code = path.charCodeAt(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 === 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);
}
for (let i = path.length - 1; i >= 0; --i) {
if (path.charCodeAt(i) === 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 (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(path) {
validateString(path, 'path');
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;
for (let i = path.length - 1; i >= 0; --i) {
const code = path.charCodeAt(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 path.slice(startDot, end);
},
format: _format.bind(null, '/'),
parse(path) {
validateString(path, 'path');
const ret = { root: '', dir: '', base: '', ext: '', name: '' };
if (path.length === 0)
return ret;
const isAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
let start;
if (isAbsolute) {
ret.root = '/';
start = 1;
} else {
start = 0;
}
let startDot = -1;
let startPart = 0;
let end = -1;
let matchedSlash = true;
let i = path.length - 1;
// Track the state of characters (if any) we see before our first dot and
// after any path separator we find
let preDotState = 0;
// Get non-dir info
for (; i >= start; --i) {
const code = path.charCodeAt(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) {
const 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 = path.slice(start, end);
} else {
ret.name = path.slice(start, startDot);
ret.base = path.slice(start, 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.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 = process.platform === 'win32' ? win32 : posix;