// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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var pathModule = require('path');
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var isWindows = process.platform === 'win32';
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var fs = require('fs');
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// JavaScript implementation of realpath, ported from node pre-v6
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var DEBUG = process.env.NODE_DEBUG && /fs/.test(process.env.NODE_DEBUG);
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function rethrow() {
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// Only enable in debug mode. A backtrace uses ~1000 bytes of heap space and
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// is fairly slow to generate.
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var callback;
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if (DEBUG) {
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var backtrace = new Error;
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callback = debugCallback;
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} else
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callback = missingCallback;
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return callback;
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function debugCallback(err) {
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if (err) {
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backtrace.message = err.message;
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err = backtrace;
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missingCallback(err);
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}
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}
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function missingCallback(err) {
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if (err) {
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if (process.throwDeprecation)
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throw err; // Forgot a callback but don't know where? Use NODE_DEBUG=fs
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else if (!process.noDeprecation) {
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var msg = 'fs: missing callback ' + (err.stack || err.message);
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if (process.traceDeprecation)
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console.trace(msg);
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else
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console.error(msg);
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}
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}
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}
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}
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function maybeCallback(cb) {
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return typeof cb === 'function' ? cb : rethrow();
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}
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var normalize = pathModule.normalize;
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// Regexp that finds the next partion of a (partial) path
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// result is [base_with_slash, base], e.g. ['somedir/', 'somedir']
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if (isWindows) {
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var nextPartRe = /(.*?)(?:[\/\\]+|$)/g;
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} else {
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var nextPartRe = /(.*?)(?:[\/]+|$)/g;
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}
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// Regex to find the device root, including trailing slash. E.g. 'c:\\'.
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if (isWindows) {
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var splitRootRe = /^(?:[a-zA-Z]:|[\\\/]{2}[^\\\/]+[\\\/][^\\\/]+)?[\\\/]*/;
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} else {
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var splitRootRe = /^[\/]*/;
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}
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exports.realpathSync = function realpathSync(p, cache) {
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// make p is absolute
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p = pathModule.resolve(p);
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if (cache && Object.prototype.hasOwnProperty.call(cache, p)) {
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return cache[p];
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}
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var original = p,
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seenLinks = {},
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knownHard = {};
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// current character position in p
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var pos;
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// the partial path so far, including a trailing slash if any
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var current;
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// the partial path without a trailing slash (except when pointing at a root)
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var base;
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// the partial path scanned in the previous round, with slash
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var previous;
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start();
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function start() {
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// Skip over roots
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var m = splitRootRe.exec(p);
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pos = m[0].length;
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current = m[0];
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base = m[0];
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previous = '';
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// On windows, check that the root exists. On unix there is no need.
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if (isWindows && !knownHard[base]) {
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fs.lstatSync(base);
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knownHard[base] = true;
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}
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}
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// walk down the path, swapping out linked pathparts for their real
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// values
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// NB: p.length changes.
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while (pos < p.length) {
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// find the next part
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nextPartRe.lastIndex = pos;
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var result = nextPartRe.exec(p);
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previous = current;
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current += result[0];
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base = previous + result[1];
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pos = nextPartRe.lastIndex;
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// continue if not a symlink
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if (knownHard[base] || (cache && cache[base] === base)) {
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continue;
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}
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var resolvedLink;
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if (cache && Object.prototype.hasOwnProperty.call(cache, base)) {
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// some known symbolic link. no need to stat again.
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resolvedLink = cache[base];
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} else {
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var stat = fs.lstatSync(base);
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if (!stat.isSymbolicLink()) {
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knownHard[base] = true;
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if (cache) cache[base] = base;
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continue;
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}
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// read the link if it wasn't read before
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// dev/ino always return 0 on windows, so skip the check.
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var linkTarget = null;
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if (!isWindows) {
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var id = stat.dev.toString(32) + ':' + stat.ino.toString(32);
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if (seenLinks.hasOwnProperty(id)) {
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linkTarget = seenLinks[id];
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}
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}
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if (linkTarget === null) {
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fs.statSync(base);
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linkTarget = fs.readlinkSync(base);
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}
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resolvedLink = pathModule.resolve(previous, linkTarget);
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// track this, if given a cache.
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if (cache) cache[base] = resolvedLink;
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if (!isWindows) seenLinks[id] = linkTarget;
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}
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// resolve the link, then start over
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p = pathModule.resolve(resolvedLink, p.slice(pos));
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start();
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}
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if (cache) cache[original] = p;
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return p;
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};
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exports.realpath = function realpath(p, cache, cb) {
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if (typeof cb !== 'function') {
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cb = maybeCallback(cache);
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cache = null;
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}
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// make p is absolute
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p = pathModule.resolve(p);
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if (cache && Object.prototype.hasOwnProperty.call(cache, p)) {
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return process.nextTick(cb.bind(null, null, cache[p]));
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}
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var original = p,
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seenLinks = {},
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knownHard = {};
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// current character position in p
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var pos;
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// the partial path so far, including a trailing slash if any
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var current;
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// the partial path without a trailing slash (except when pointing at a root)
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var base;
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// the partial path scanned in the previous round, with slash
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var previous;
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start();
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function start() {
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// Skip over roots
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var m = splitRootRe.exec(p);
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pos = m[0].length;
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current = m[0];
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base = m[0];
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previous = '';
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// On windows, check that the root exists. On unix there is no need.
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if (isWindows && !knownHard[base]) {
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fs.lstat(base, function(err) {
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if (err) return cb(err);
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knownHard[base] = true;
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LOOP();
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});
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} else {
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process.nextTick(LOOP);
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}
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}
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// walk down the path, swapping out linked pathparts for their real
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// values
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function LOOP() {
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// stop if scanned past end of path
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if (pos >= p.length) {
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if (cache) cache[original] = p;
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return cb(null, p);
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}
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// find the next part
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nextPartRe.lastIndex = pos;
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var result = nextPartRe.exec(p);
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previous = current;
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current += result[0];
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base = previous + result[1];
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pos = nextPartRe.lastIndex;
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// continue if not a symlink
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if (knownHard[base] || (cache && cache[base] === base)) {
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return process.nextTick(LOOP);
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}
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if (cache && Object.prototype.hasOwnProperty.call(cache, base)) {
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// known symbolic link. no need to stat again.
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return gotResolvedLink(cache[base]);
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}
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return fs.lstat(base, gotStat);
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}
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function gotStat(err, stat) {
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if (err) return cb(err);
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// if not a symlink, skip to the next path part
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if (!stat.isSymbolicLink()) {
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knownHard[base] = true;
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if (cache) cache[base] = base;
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return process.nextTick(LOOP);
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}
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// stat & read the link if not read before
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// call gotTarget as soon as the link target is known
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// dev/ino always return 0 on windows, so skip the check.
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if (!isWindows) {
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var id = stat.dev.toString(32) + ':' + stat.ino.toString(32);
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if (seenLinks.hasOwnProperty(id)) {
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return gotTarget(null, seenLinks[id], base);
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}
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}
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fs.stat(base, function(err) {
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if (err) return cb(err);
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fs.readlink(base, function(err, target) {
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if (!isWindows) seenLinks[id] = target;
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gotTarget(err, target);
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});
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});
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}
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function gotTarget(err, target, base) {
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if (err) return cb(err);
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var resolvedLink = pathModule.resolve(previous, target);
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if (cache) cache[base] = resolvedLink;
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gotResolvedLink(resolvedLink);
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}
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function gotResolvedLink(resolvedLink) {
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// resolve the link, then start over
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p = pathModule.resolve(resolvedLink, p.slice(pos));
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start();
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}
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};
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