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denoland-deno/fs/path/mod.ts
2019-01-26 23:19:56 -05:00

1431 lines
43 KiB
TypeScript

// Copyright the Browserify authors. MIT License.
// Ported from https://github.com/browserify/path-browserify/
import { cwd, env } from "deno";
import { FormatInputPathObject, ParsedPath } from "./interface.ts";
import {
isWindows,
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
} from "./constants.ts";
function assertPath(path: string): void {
if (typeof path !== "string") {
throw new TypeError(
`Path must be a string. Received ${JSON.stringify(path)}`
);
}
}
function isPosixPathSeparator(code: number): boolean {
return code === CHAR_FORWARD_SLASH;
}
function isPathSeparator(code: number): boolean {
return isPosixPathSeparator(code) || code === CHAR_BACKWARD_SLASH;
}
function isWindowsDeviceRoot(code: number): boolean {
return (
(code >= CHAR_LOWERCASE_A && code <= CHAR_LOWERCASE_Z) ||
(code >= CHAR_UPPERCASE_A && code <= CHAR_UPPERCASE_Z)
);
}
// Resolves . and .. elements in a path with directory names
function normalizeString(
path: string,
allowAboveRoot: boolean,
separator: string,
isPathSeparator: (code: number) => boolean
): string {
let res = "";
let lastSegmentLength = 0;
let lastSlash = -1;
let dots = 0;
let code: number;
for (let i = 0, len = path.length; i <= len; ++i) {
if (i < len) code = path.charCodeAt(i);
else if (isPathSeparator(code)) break;
else code = CHAR_FORWARD_SLASH;
if (isPathSeparator(code)) {
if (lastSlash === i - 1 || dots === 1) {
// NOOP
} else if (lastSlash !== i - 1 && dots === 2) {
if (
res.length < 2 ||
lastSegmentLength !== 2 ||
res.charCodeAt(res.length - 1) !== CHAR_DOT ||
res.charCodeAt(res.length - 2) !== CHAR_DOT
) {
if (res.length > 2) {
const lastSlashIndex = res.lastIndexOf(separator);
if (lastSlashIndex === -1) {
res = "";
lastSegmentLength = 0;
} else {
res = res.slice(0, lastSlashIndex);
lastSegmentLength = res.length - 1 - res.lastIndexOf(separator);
}
lastSlash = i;
dots = 0;
continue;
} else if (res.length === 2 || res.length === 1) {
res = "";
lastSegmentLength = 0;
lastSlash = i;
dots = 0;
continue;
}
}
if (allowAboveRoot) {
if (res.length > 0) res += `${separator}..`;
else res = "..";
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: string, pathObject: FormatInputPathObject): string {
const dir: string | null = pathObject.dir || pathObject.root;
const base: string =
pathObject.base || (pathObject.name || "") + (pathObject.ext || "");
if (!dir) return base;
if (dir === pathObject.root) return dir + base;
return dir + sep + base;
}
export const win32 = {
// path.resolve([from ...], to)
resolve(...pathSegments: string[]): string {
let resolvedDevice = "";
let resolvedTail = "";
let resolvedAbsolute = false;
for (let i = pathSegments.length - 1; i >= -1; i--) {
let path: string;
if (i >= 0) {
path = pathSegments[i];
} else if (!resolvedDevice) {
path = 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 = env()[`=${resolvedDevice}`] || cwd();
// Verify that a cwd was found and that it actually points
// to our drive. If not, default to the drive's root.
if (
path === undefined ||
path.slice(0, 3).toLowerCase() !== `${resolvedDevice.toLowerCase()}\\`
) {
path = `${resolvedDevice}\\`;
}
}
assertPath(path);
const len = path.length;
// Skip empty entries
if (len === 0) continue;
let rootEnd = 0;
let device = "";
let isAbsolute = false;
const code = path.charCodeAt(0);
// Try to match a root
if (len > 1) {
if (isPathSeparator(code)) {
// Possible UNC root
// If we started with a separator, we know we at least have an
// absolute path of some kind (UNC or otherwise)
isAbsolute = true;
if (isPathSeparator(path.charCodeAt(1))) {
// Matched double path separator at beginning
let j = 2;
let last = j;
// Match 1 or more non-path separators
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j))) break;
}
if (j < len && j !== last) {
const firstPart = path.slice(last, j);
// Matched!
last = j;
// Match 1 or more path separators
for (; j < len; ++j) {
if (!isPathSeparator(path.charCodeAt(j))) break;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more non-path separators
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j))) break;
}
if (j === len) {
// We matched a UNC root only
device = `\\\\${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 (isWindowsDeviceRoot(code)) {
// Possible device root
if (path.charCodeAt(1) === CHAR_COLON) {
device = path.slice(0, 2);
rootEnd = 2;
if (len > 2) {
if (isPathSeparator(path.charCodeAt(2))) {
// Treat separator following drive name as an absolute path
// indicator
isAbsolute = true;
rootEnd = 3;
}
}
}
}
} else if (isPathSeparator(code)) {
// `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 (resolvedAbsolute && 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 (
resolvedDevice + (resolvedAbsolute ? "\\" : "") + resolvedTail || "."
);
},
normalize(path: string): string {
assertPath(path);
const len = path.length;
if (len === 0) return ".";
let rootEnd = 0;
let device: string;
let isAbsolute = false;
const code = path.charCodeAt(0);
// Try to match a root
if (len > 1) {
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
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j))) 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) {
if (!isPathSeparator(path.charCodeAt(j))) break;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more non-path separators
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j))) 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 (isWindowsDeviceRoot(code)) {
// Possible device root
if (path.charCodeAt(1) === CHAR_COLON) {
device = path.slice(0, 2);
rootEnd = 2;
if (len > 2) {
if (isPathSeparator(path.charCodeAt(2))) {
// Treat separator following drive name as an absolute path
// indicator
isAbsolute = true;
rootEnd = 3;
}
}
}
}
} else if (isPathSeparator(code)) {
// `path` contains just a path separator, exit early to avoid unnecessary
// work
return "\\";
}
let tail: string;
if (rootEnd < len) {
tail = normalizeString(
path.slice(rootEnd),
!isAbsolute,
"\\",
isPathSeparator
);
} else {
tail = "";
}
if (tail.length === 0 && !isAbsolute) tail = ".";
if (tail.length > 0 && isPathSeparator(path.charCodeAt(len - 1)))
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 `${device}\\`;
} else if (tail.length > 0) {
return device + tail;
} else {
return device;
}
},
isAbsolute(path: string): boolean {
assertPath(path);
const len = path.length;
if (len === 0) return false;
const code = path.charCodeAt(0);
if (isPathSeparator(code)) {
return true;
} else if (isWindowsDeviceRoot(code)) {
// Possible device root
if (len > 2 && path.charCodeAt(1) === CHAR_COLON) {
if (isPathSeparator(path.charCodeAt(2))) return true;
}
}
return false;
},
join(...paths: string[]): string {
const pathsCount = paths.length;
if (pathsCount === 0) return ".";
let joined: string;
let firstPart: string;
for (let i = 0; i < pathsCount; ++i) {
let path = paths[i];
assertPath(path);
if (path.length > 0) {
if (joined === undefined) joined = firstPart = path;
else joined += `\\${path}`;
}
}
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\\')
let needsReplace = true;
let slashCount = 0;
if (isPathSeparator(firstPart.charCodeAt(0))) {
++slashCount;
const firstLen = firstPart.length;
if (firstLen > 1) {
if (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
for (; slashCount < joined.length; ++slashCount) {
if (!isPathSeparator(joined.charCodeAt(slashCount))) 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(from: string, to: string): string {
assertPath(from);
assertPath(to);
if (from === to) return "";
let fromOrig = win32.resolve(from);
let 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;
let fromEnd = from.length;
for (; fromStart < fromEnd; ++fromStart) {
if (from.charCodeAt(fromStart) !== CHAR_BACKWARD_SLASH) break;
}
// Trim trailing backslashes (applicable to UNC paths only)
for (; fromEnd - 1 > fromStart; --fromEnd) {
if (from.charCodeAt(fromEnd - 1) !== CHAR_BACKWARD_SLASH) break;
}
let fromLen = fromEnd - fromStart;
// Trim any leading backslashes
let toStart = 0;
let toEnd = to.length;
for (; toStart < toEnd; ++toStart) {
if (to.charCodeAt(toStart) !== CHAR_BACKWARD_SLASH) break;
}
// Trim trailing backslashes (applicable to UNC paths only)
for (; toEnd - 1 > toStart; --toEnd) {
if (to.charCodeAt(toEnd - 1) !== CHAR_BACKWARD_SLASH) break;
}
let toLen = toEnd - toStart;
// Compare paths to find the longest common path from root
let length = fromLen < toLen ? fromLen : toLen;
let lastCommonSep = -1;
let i = 0;
for (; i <= length; ++i) {
if (i === length) {
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);
} 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) === 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;
}
}
break;
}
let fromCode = from.charCodeAt(fromStart + i);
let toCode = to.charCodeAt(toStart + i);
if (fromCode !== toCode) 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 && lastCommonSep === -1) {
return toOrig;
}
let 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) === CHAR_BACKWARD_SLASH) {
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) === CHAR_BACKWARD_SLASH) ++toStart;
return toOrig.slice(toStart, toEnd);
}
},
toNamespacedPath(path: string): string {
// 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) {
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))) {
// Possible device root
if (
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: string): string {
assertPath(path);
const len = path.length;
if (len === 0) return ".";
let rootEnd = -1;
let end = -1;
let matchedSlash = true;
let offset = 0;
const code = path.charCodeAt(0);
// Try to match a root
if (len > 1) {
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
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j))) break;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more path separators
for (; j < len; ++j) {
if (!isPathSeparator(path.charCodeAt(j))) break;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more non-path separators
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j))) 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 (isWindowsDeviceRoot(code)) {
// Possible device root
if (path.charCodeAt(1) === CHAR_COLON) {
rootEnd = offset = 2;
if (len > 2) {
if (isPathSeparator(path.charCodeAt(2))) rootEnd = offset = 3;
}
}
}
} else if (isPathSeparator(code)) {
// `path` contains just a path separator, exit early to avoid
// unnecessary work
return path;
}
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 ".";
else end = rootEnd;
}
return path.slice(0, end);
},
basename(path: string, ext = ""): string {
if (ext !== undefined && typeof ext !== "string")
throw new TypeError('"ext" argument must be a string');
assertPath(path);
let start = 0;
let end = -1;
let matchedSlash = true;
let i: number;
// 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 (isWindowsDeviceRoot(drive)) {
if (path.charCodeAt(1) === CHAR_COLON) start = 2;
}
}
if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
if (ext.length === path.length && ext === path) return "";
let extIdx = ext.length - 1;
let firstNonSlashEnd = -1;
for (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);
} else {
for (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: string): string {
assertPath(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(pathObject: FormatInputPathObject): string {
if (pathObject === null || typeof pathObject !== "object") {
throw new TypeError(
`The "pathObject" argument must be of type Object. Received type ${typeof pathObject}`
);
}
return _format("\\", pathObject);
},
parse(path: string): ParsedPath {
assertPath(path);
let ret = { root: "", dir: "", base: "", ext: "", name: "" } as ParsedPath;
const len = path.length;
if (len === 0) return ret;
let rootEnd = 0;
let code = path.charCodeAt(0);
// Try to match a root
if (len > 1) {
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
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j))) break;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more path separators
for (; j < len; ++j) {
if (!isPathSeparator(path.charCodeAt(j))) break;
}
if (j < len && j !== last) {
// Matched!
last = j;
// Match 1 or more non-path separators
for (; j < len; ++j) {
if (isPathSeparator(path.charCodeAt(j))) break;
}
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)) {
// Possible device root
if (path.charCodeAt(1) === CHAR_COLON) {
rootEnd = 2;
if (len > 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;
}
} else {
// `path` contains just a drive root, exit early to avoid
// unnecessary work
ret.root = ret.dir = path;
return ret;
}
}
}
} else if (isPathSeparator(code)) {
// `path` contains just a path separator, exit early to avoid
// unnecessary work
ret.root = ret.dir = path;
return ret;
}
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 (
startDot === -1 ||
end === -1 ||
// We saw a non-dot character immediately before the dot
preDotState === 0 ||
// The (right-most) trimmed path component is exactly '..'
(preDotState === 1 && startDot === end - 1 && startDot === startPart + 1)
) {
if (end !== -1) {
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
};
export const posix = {
// path.resolve([from ...], to)
resolve(...pathSegments: string[]): string {
let resolvedPath = "";
let resolvedAbsolute = false;
for (let i = pathSegments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
let path: string;
if (i >= 0) path = pathSegments[i];
else path = cwd();
assertPath(path);
// Skip empty entries
if (path.length === 0) {
continue;
}
resolvedPath = `${path}/${resolvedPath}`;
resolvedAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
}
// At this point the path should be resolved to a full absolute path, but
// handle relative paths to be safe (might happen when process.cwd() fails)
// Normalize the path
resolvedPath = normalizeString(
resolvedPath,
!resolvedAbsolute,
"/",
isPosixPathSeparator
);
if (resolvedAbsolute) {
if (resolvedPath.length > 0) return `/${resolvedPath}`;
else return "/";
} else if (resolvedPath.length > 0) return resolvedPath;
else return ".";
},
normalize(path: string): string {
assertPath(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 && !isAbsolute) path = ".";
if (path.length > 0 && trailingSeparator) path += "/";
if (isAbsolute) return `/${path}`;
return path;
},
isAbsolute(path: string): boolean {
assertPath(path);
return path.length > 0 && path.charCodeAt(0) === CHAR_FORWARD_SLASH;
},
join(...paths: string[]): string {
if (paths.length === 0) return ".";
let joined: string | undefined;
for (let i = 0, len = paths.length; i < len; ++i) {
let path = paths[i];
assertPath(path);
if (path.length > 0) {
if (!joined) joined = path;
else joined += `/${path}`;
}
}
if (!joined) return ".";
return posix.normalize(joined);
},
relative(from: string, to: string): string {
assertPath(from);
assertPath(to);
if (from === to) return "";
from = posix.resolve(from);
to = posix.resolve(to);
if (from === to) return "";
// Trim any leading backslashes
let fromStart = 1;
let fromEnd = from.length;
for (; fromStart < fromEnd; ++fromStart) {
if (from.charCodeAt(fromStart) !== CHAR_FORWARD_SLASH) break;
}
let fromLen = fromEnd - fromStart;
// Trim any leading backslashes
let toStart = 1;
const toEnd = to.length;
for (; toStart < toEnd; ++toStart) {
if (to.charCodeAt(toStart) !== CHAR_FORWARD_SLASH) break;
}
let toLen = toEnd - toStart;
// Compare paths to find the longest common path from root
let length = fromLen < toLen ? fromLen : toLen;
let lastCommonSep = -1;
let i = 0;
for (; i <= length; ++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);
} else if (i === 0) {
// We get here if `from` is the root
// For example: from='/'; to='/foo'
return to.slice(toStart + i);
}
} else if (fromLen > length) {
if (from.charCodeAt(fromStart + i) === 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'; to='/'
lastCommonSep = 0;
}
}
break;
}
let fromCode = from.charCodeAt(fromStart + i);
let toCode = to.charCodeAt(toStart + i);
if (fromCode !== toCode) break;
else if (fromCode === CHAR_FORWARD_SLASH) lastCommonSep = i;
}
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) {
if (out.length === 0) out += "..";
else out += "/..";
}
}
// Lastly, append the rest of the destination (`to`) path that comes after
// the common path parts
if (out.length > 0) return out + to.slice(toStart + lastCommonSep);
else {
toStart += lastCommonSep;
if (to.charCodeAt(toStart) === CHAR_FORWARD_SLASH) ++toStart;
return to.slice(toStart);
}
},
toNamespacedPath(path: string): string {
// Non-op on posix systems
return path;
},
dirname(path: string): string {
assertPath(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: string, ext = ""): string {
if (ext !== undefined && typeof ext !== "string")
throw new TypeError('"ext" argument must be a string');
assertPath(path);
let start = 0;
let end = -1;
let matchedSlash = true;
let i: number;
if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
if (ext.length === path.length && ext === path) return "";
let extIdx = ext.length - 1;
let firstNonSlashEnd = -1;
for (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);
} else {
for (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: string): string {
assertPath(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(pathObject: FormatInputPathObject): string {
if (pathObject === null || typeof pathObject !== "object") {
throw new TypeError(
`The "pathObject" argument must be of type Object. Received type ${typeof pathObject}`
);
}
return _format("/", pathObject);
},
parse(path: string): ParsedPath {
assertPath(path);
let ret = { root: "", dir: "", base: "", ext: "", name: "" } as ParsedPath;
if (path.length === 0) return ret;
let isAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
let start: number;
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 (
startDot === -1 ||
end === -1 ||
// We saw a non-dot character immediately before the dot
preDotState === 0 ||
// The (right-most) trimmed path component is exactly '..'
(preDotState === 1 && startDot === end - 1 && startDot === startPart + 1)
) {
if (end !== -1) {
if (startPart === 0 && isAbsolute) {
ret.base = ret.name = path.slice(1, end);
} else {
ret.base = ret.name = path.slice(startPart, end);
}
}
} else {
if (startPart === 0 && isAbsolute) {
ret.name = path.slice(1, startDot);
ret.base = path.slice(1, end);
} else {
ret.name = path.slice(startPart, startDot);
ret.base = path.slice(startPart, end);
}
ret.ext = path.slice(startDot, end);
}
if (startPart > 0) ret.dir = path.slice(0, startPart - 1);
else if (isAbsolute) ret.dir = "/";
return ret;
},
sep: "/",
delimiter: ":",
win32: null,
posix: null
};
posix.win32 = win32.win32 = win32;
posix.posix = win32.posix = posix;
const module = isWindows ? win32 : posix;
export const resolve = module.resolve;
export const normalize = module.normalize;
export const isAbsolute = module.isAbsolute;
export const join = module.join;
export const relative = module.relative;
export const toNamespacedPath = module.toNamespacedPath;
export const dirname = module.dirname;
export const basename = module.basename;
export const extname = module.extname;
export const format = module.format;
export const parse = module.parse;
export const sep = module.sep;
export const delimiter = module.delimiter;