311 lines
11 KiB
JavaScript
311 lines
11 KiB
JavaScript
import { validateString } from "./util.mjs";
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const CHAR_DOT = 46; /* . */
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const CHAR_FORWARD_SLASH = 47; /* / */
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const CHAR_BACKWARD_SLASH = 92; /* \ */
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const CHAR_COLON = 58; /* : */
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const CHAR_UPPERCASE_A = 65; /* A */
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const CHAR_UPPERCASE_Z = 90; /* Z */
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const CHAR_LOWERCASE_A = 97; /* a */
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const CHAR_LOWERCASE_Z = 122; /* z */
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function isPathSeparatorWin(code) {
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return code === CHAR_FORWARD_SLASH || code === CHAR_BACKWARD_SLASH;
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}
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function isWindowsDeviceRoot(code) {
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return (code >= CHAR_UPPERCASE_A && code <= CHAR_UPPERCASE_Z) ||
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(code >= CHAR_LOWERCASE_A && code <= CHAR_LOWERCASE_Z);
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}
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const _isWin32 = typeof process !== 'undefined' && process.platform === 'win32';
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/**
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* Windows variant of `resolve()`. Mirrors Node's `path.win32.resolve`
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* semantics enough for the WASI shim's needs (drive-letter absolutes
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* + UNC paths + per-drive cwd lookups via `process.env`/`process.cwd`).
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*
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* Why this is needed: on Windows, `FileDescriptor.realPath` is the
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* host realpath returned by `fs.realpathSync(realPath, 'utf8')` — the
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* backslash form `D:\…`. The POSIX-only `resolveImpl` below only
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* treats `/` as a separator, reads `D` as non-`/`, decides realPath
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* is "relative", and produces a garbage joined path. Downstream
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* `fs.openSync(garbage)` then returns `EINVAL` and the WASI caller
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* sees a permanent failure. This function gives us the correct
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* Windows-style resolution without taking a Node-only `path` import
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* (which would break browser bundles of this package).
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*
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* Cribbed from Node's `lib/path.js` `win32.resolve()` (MIT-licensed),
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* trimmed to what WASI realpath resolution actually exercises.
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*/
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function resolveWin32(args) {
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let resolvedDevice = '';
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let resolvedTail = '';
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let resolvedAbsolute = false;
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for (let i = args.length - 1; i >= -1; i--) {
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let path;
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if (i >= 0) {
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path = args[i];
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validateString(path, 'path');
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if (path.length === 0)
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continue;
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}
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else if (resolvedDevice.length === 0) {
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path = (typeof process !== 'undefined' && typeof process.cwd === 'function')
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? process.cwd()
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: '';
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}
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else {
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// Look up per-drive cwd via the `=X:` env var convention; fall back
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// to the global cwd if absent.
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const envKey = `=${resolvedDevice}`;
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const env = (typeof process !== 'undefined') ? process.env : undefined;
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path = (env && typeof env[envKey] === 'string')
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? env[envKey]
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: (typeof process !== 'undefined' && typeof process.cwd === 'function')
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? process.cwd()
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: '';
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if (path === undefined ||
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(path.slice(0, 2).toLowerCase() !== resolvedDevice.toLowerCase() &&
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path.charCodeAt(2) === CHAR_BACKWARD_SLASH)) {
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path = `${resolvedDevice}\\`;
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}
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}
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const len = path.length;
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let rootEnd = 0;
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let device = '';
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let isAbsolute = false;
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const code = path.charCodeAt(0);
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if (len === 1) {
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if (isPathSeparatorWin(code)) {
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rootEnd = 1;
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isAbsolute = true;
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}
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}
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else if (isPathSeparatorWin(code)) {
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isAbsolute = true;
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if (isPathSeparatorWin(path.charCodeAt(1))) {
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// UNC path: `\\server\share\…`
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let j = 2;
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let last = j;
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while (j < len && !isPathSeparatorWin(path.charCodeAt(j)))
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j++;
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if (j < len && j !== last) {
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const firstPart = path.slice(last, j);
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last = j;
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while (j < len && isPathSeparatorWin(path.charCodeAt(j)))
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j++;
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if (j < len && j !== last) {
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last = j;
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while (j < len && !isPathSeparatorWin(path.charCodeAt(j)))
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j++;
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if (j === len || j !== last) {
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device = `\\\\${firstPart}\\${path.slice(last, j)}`;
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rootEnd = j;
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}
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}
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}
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}
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else {
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rootEnd = 1;
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}
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}
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else if (isWindowsDeviceRoot(code) && path.charCodeAt(1) === CHAR_COLON) {
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device = path.slice(0, 2);
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rootEnd = 2;
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if (len > 2 && isPathSeparatorWin(path.charCodeAt(2))) {
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isAbsolute = true;
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rootEnd = 3;
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}
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}
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if (device.length > 0) {
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if (resolvedDevice.length > 0) {
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if (device.toLowerCase() !== resolvedDevice.toLowerCase())
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continue;
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}
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else {
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resolvedDevice = device;
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}
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}
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if (resolvedAbsolute) {
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if (resolvedDevice.length > 0)
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break;
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}
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else {
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resolvedTail = `${path.slice(rootEnd)}\\${resolvedTail}`;
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resolvedAbsolute = isAbsolute;
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if (isAbsolute && resolvedDevice.length > 0)
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break;
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}
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}
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resolvedTail = normalizeString(resolvedTail, !resolvedAbsolute, '\\', isPathSeparatorWin);
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return resolvedDevice + (resolvedAbsolute ? '\\' : '') + resolvedTail || '.';
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}
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function isPosixPathSeparator(code) {
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return code === CHAR_FORWARD_SLASH;
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}
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function normalizeString(path, allowAboveRoot, separator, isPathSeparator) {
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let res = '';
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let lastSegmentLength = 0;
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let lastSlash = -1;
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let dots = 0;
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let code = 0;
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for (let i = 0; i <= path.length; ++i) {
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if (i < path.length) {
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code = path.charCodeAt(i);
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}
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else if (isPathSeparator(code)) {
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break;
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}
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else {
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code = CHAR_FORWARD_SLASH;
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}
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if (isPathSeparator(code)) {
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if (lastSlash === i - 1 || dots === 1) {
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// NOOP
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}
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else if (dots === 2) {
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if (res.length < 2 || lastSegmentLength !== 2 ||
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res.charCodeAt(res.length - 1) !== CHAR_DOT ||
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res.charCodeAt(res.length - 2) !== CHAR_DOT) {
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if (res.length > 2) {
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const lastSlashIndex = res.indexOf(separator);
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if (lastSlashIndex === -1) {
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res = '';
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lastSegmentLength = 0;
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}
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else {
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res = res.slice(0, lastSlashIndex);
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lastSegmentLength =
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res.length - 1 - res.indexOf(separator);
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}
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lastSlash = i;
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dots = 0;
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continue;
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}
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else if (res.length !== 0) {
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res = '';
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lastSegmentLength = 0;
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lastSlash = i;
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dots = 0;
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continue;
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}
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}
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if (allowAboveRoot) {
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res += res.length > 0 ? `${separator}..` : '..';
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lastSegmentLength = 2;
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}
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}
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else {
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if (res.length > 0) {
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res += `${separator}${path.slice(lastSlash + 1, i)}`;
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}
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else {
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res = path.slice(lastSlash + 1, i);
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}
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lastSegmentLength = i - lastSlash - 1;
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}
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lastSlash = i;
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dots = 0;
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}
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else if (code === CHAR_DOT && dots !== -1) {
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++dots;
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}
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else {
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dots = -1;
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}
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}
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return res;
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}
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export function resolve(...args) {
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// On Windows, host paths are `D:\…` style. The POSIX-only resolver
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// below treats `D` as a non-`/` character and produces garbage; route
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// to the Windows-aware variant. POSIX hosts (Linux/macOS/browser)
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// run the original code path unchanged — `_isWin32` is constant-folded
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// away on those targets.
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if (_isWin32)
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return resolveWin32(args);
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let resolvedPath = '';
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let resolvedAbsolute = false;
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for (let i = args.length - 1; i >= -1 && !resolvedAbsolute; i--) {
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const path = i >= 0 ? args[i] : '/';
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validateString(path, 'path');
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// Skip empty entries
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if (path.length === 0) {
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continue;
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}
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resolvedPath = `${path}/${resolvedPath}`;
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resolvedAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
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}
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// At this point the path should be resolved to a full absolute path, but
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// handle relative paths to be safe (might happen when process.cwd() fails)
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// Normalize the path
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resolvedPath = normalizeString(resolvedPath, !resolvedAbsolute, '/', isPosixPathSeparator);
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if (resolvedAbsolute) {
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return `/${resolvedPath}`;
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}
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return resolvedPath.length > 0 ? resolvedPath : '.';
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}
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export function relative(from, to) {
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validateString(from, 'from');
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validateString(to, 'to');
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if (from === to)
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return '';
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// Trim leading forward slashes.
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from = resolve(from);
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to = resolve(to);
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if (from === to)
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return '';
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const fromStart = 1;
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const fromEnd = from.length;
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const fromLen = fromEnd - fromStart;
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const toStart = 1;
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const toLen = to.length - toStart;
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// Compare paths to find the longest common path from root
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const length = (fromLen < toLen ? fromLen : toLen);
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let lastCommonSep = -1;
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let i = 0;
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for (; i < length; i++) {
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const fromCode = from.charCodeAt(fromStart + i);
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if (fromCode !== to.charCodeAt(toStart + i)) {
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break;
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}
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else if (fromCode === CHAR_FORWARD_SLASH) {
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lastCommonSep = i;
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}
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}
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if (i === length) {
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if (toLen > length) {
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if (to.charCodeAt(toStart + i) === CHAR_FORWARD_SLASH) {
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// We get here if `from` is the exact base path for `to`.
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// For example: from='/foo/bar'; to='/foo/bar/baz'
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return to.slice(toStart + i + 1);
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}
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if (i === 0) {
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// We get here if `from` is the root
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// For example: from='/'; to='/foo'
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return to.slice(toStart + i);
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}
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}
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else if (fromLen > length) {
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if (from.charCodeAt(fromStart + i) === CHAR_FORWARD_SLASH) {
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// We get here if `to` is the exact base path for `from`.
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// For example: from='/foo/bar/baz'; to='/foo/bar'
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lastCommonSep = i;
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}
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else if (i === 0) {
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// We get here if `to` is the root.
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// For example: from='/foo/bar'; to='/'
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lastCommonSep = 0;
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}
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}
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}
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let out = '';
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// Generate the relative path based on the path difference between `to`
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// and `from`.
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for (i = fromStart + lastCommonSep + 1; i <= fromEnd; ++i) {
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if (i === fromEnd ||
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from.charCodeAt(i) === CHAR_FORWARD_SLASH) {
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out += out.length === 0 ? '..' : '/..';
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}
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}
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// Lastly, append the rest of the destination (`to`) path that comes after
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// the common path parts.
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return `${out}${to.slice(toStart + lastCommonSep)}`;
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}
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