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