var fs = require('fs'); var path = require('path'); var caller = require('./caller'); var nodeModulesPaths = require('./node-modules-paths'); var normalizeOptions = require('./normalize-options'); var isCore = require('is-core-module'); var realpathFS = fs.realpath && typeof fs.realpath.native === 'function' ? fs.realpath.native : fs.realpath; var defaultIsFile = function isFile(file, cb) { fs.stat(file, function (err, stat) { if (!err) { return cb(null, stat.isFile() || stat.isFIFO()); } if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false); return cb(err); }); }; var defaultIsDir = function isDirectory(dir, cb) { fs.stat(dir, function (err, stat) { if (!err) { return cb(null, stat.isDirectory()); } if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false); return cb(err); }); }; var defaultRealpath = function realpath(x, cb) { realpathFS(x, function (realpathErr, realPath) { if (realpathErr && realpathErr.code !== 'ENOENT') cb(realpathErr); else cb(null, realpathErr ? x : realPath); }); }; var maybeRealpath = function maybeRealpath(realpath, x, opts, cb) { if (opts && opts.preserveSymlinks === false) { realpath(x, cb); } else { cb(null, x); } }; var getPackageCandidates = function getPackageCandidates(x, start, opts) { var dirs = nodeModulesPaths(start, opts, x); for (var i = 0; i < dirs.length; i++) { dirs[i] = path.join(dirs[i], x); } return dirs; }; module.exports = function resolve(x, options, callback) { var cb = callback; var opts = options; if (typeof options === 'function') { cb = opts; opts = {}; } if (typeof x !== 'string') { var err = new TypeError('Path must be a string.'); return process.nextTick(function () { cb(err); }); } opts = normalizeOptions(x, opts); var isFile = opts.isFile || defaultIsFile; var isDirectory = opts.isDirectory || defaultIsDir; var readFile = opts.readFile || fs.readFile; var realpath = opts.realpath || defaultRealpath; var packageIterator = opts.packageIterator; var extensions = opts.extensions || ['.js']; var includeCoreModules = opts.includeCoreModules !== false; var basedir = opts.basedir || path.dirname(caller()); var parent = opts.filename || basedir; opts.paths = opts.paths || []; // ensure that `basedir` is an absolute path at this point, resolving against the process' current working directory var absoluteStart = path.resolve(basedir); maybeRealpath( realpath, absoluteStart, opts, function (err, realStart) { if (err) cb(err); else init(realStart); } ); var res; function init(basedir) { if ((/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/).test(x)) { res = path.resolve(basedir, x); if (x === '.' || x === '..' || x.slice(-1) === '/') res += '/'; if ((/\/$/).test(x) && res === basedir) { loadAsDirectory(res, opts.package, onfile); } else loadAsFile(res, opts.package, onfile); } else if (includeCoreModules && isCore(x)) { return cb(null, x); } else loadNodeModules(x, basedir, function (err, n, pkg) { if (err) cb(err); else if (n) { return maybeRealpath(realpath, n, opts, function (err, realN) { if (err) { cb(err); } else { cb(null, realN, pkg); } }); } else { var moduleError = new Error("Cannot find module '" + x + "' from '" + parent + "'"); moduleError.code = 'MODULE_NOT_FOUND'; cb(moduleError); } }); } function onfile(err, m, pkg) { if (err) cb(err); else if (m) cb(null, m, pkg); else loadAsDirectory(res, function (err, d, pkg) { if (err) cb(err); else if (d) { maybeRealpath(realpath, d, opts, function (err, realD) { if (err) { cb(err); } else { cb(null, realD, pkg); } }); } else { var moduleError = new Error("Cannot find module '" + x + "' from '" + parent + "'"); moduleError.code = 'MODULE_NOT_FOUND'; cb(moduleError); } }); } function loadAsFile(x, thePackage, callback) { var loadAsFilePackage = thePackage; var cb = callback; if (typeof loadAsFilePackage === 'function') { cb = loadAsFilePackage; loadAsFilePackage = undefined; } var exts = [''].concat(extensions); load(exts, x, loadAsFilePackage); function load(exts, x, loadPackage) { if (exts.length === 0) return cb(null, undefined, loadPackage); var file = x + exts[0]; var pkg = loadPackage; if (pkg) onpkg(null, pkg); else loadpkg(path.dirname(file), onpkg); function onpkg(err, pkg_, dir) { pkg = pkg_; if (err) return cb(err); if (dir && pkg && opts.pathFilter) { var rfile = path.relative(dir, file); var rel = rfile.slice(0, rfile.length - exts[0].length); var r = opts.pathFilter(pkg, x, rel); if (r) return load( [''].concat(extensions.slice()), path.resolve(dir, r), pkg ); } isFile(file, onex); } function onex(err, ex) { if (err) return cb(err); if (ex) return cb(null, file, pkg); load(exts.slice(1), x, pkg); } } } function loadpkg(dir, cb) { if (dir === '' || dir === '/') return cb(null); if (process.platform === 'win32' && (/^\w:[/\\]*$/).test(dir)) { return cb(null); } if ((/[/\\]node_modules[/\\]*$/).test(dir)) return cb(null); maybeRealpath(realpath, dir, opts, function (unwrapErr, pkgdir) { if (unwrapErr) return loadpkg(path.dirname(dir), cb); var pkgfile = path.join(pkgdir, 'package.json'); isFile(pkgfile, function (err, ex) { // on err, ex is false if (!ex) return loadpkg(path.dirname(dir), cb); readFile(pkgfile, function (err, body) { if (err) cb(err); try { var pkg = JSON.parse(body); } catch (jsonErr) {} if (pkg && opts.packageFilter) { pkg = opts.packageFilter(pkg, pkgfile); } cb(null, pkg, dir); }); }); }); } function loadAsDirectory(x, loadAsDirectoryPackage, callback) { var cb = callback; var fpkg = loadAsDirectoryPackage; if (typeof fpkg === 'function') { cb = fpkg; fpkg = opts.package; } maybeRealpath(realpath, x, opts, function (unwrapErr, pkgdir) { if (unwrapErr) return cb(unwrapErr); var pkgfile = path.join(pkgdir, 'package.json'); isFile(pkgfile, function (err, ex) { if (err) return cb(err); if (!ex) return loadAsFile(path.join(x, 'index'), fpkg, cb); readFile(pkgfile, function (err, body) { if (err) return cb(err); try { var pkg = JSON.parse(body); } catch (jsonErr) {} if (pkg && opts.packageFilter) { pkg = opts.packageFilter(pkg, pkgfile); } if (pkg && pkg.main) { if (typeof pkg.main !== 'string') { var mainError = new TypeError('package “' + pkg.name + '” `main` must be a string'); mainError.code = 'INVALID_PACKAGE_MAIN'; return cb(mainError); } if (pkg.main === '.' || pkg.main === './') { pkg.main = 'index'; } loadAsFile(path.resolve(x, pkg.main), pkg, function (err, m, pkg) { if (err) return cb(err); if (m) return cb(null, m, pkg); if (!pkg) return loadAsFile(path.join(x, 'index'), pkg, cb); var dir = path.resolve(x, pkg.main); loadAsDirectory(dir, pkg, function (err, n, pkg) { if (err) return cb(err); if (n) return cb(null, n, pkg); loadAsFile(path.join(x, 'index'), pkg, cb); }); }); return; } loadAsFile(path.join(x, '/index'), pkg, cb); }); }); }); } function processDirs(cb, dirs) { if (dirs.length === 0) return cb(null, undefined); var dir = dirs[0]; isDirectory(path.dirname(dir), isdir); function isdir(err, isdir) { if (err) return cb(err); if (!isdir) return processDirs(cb, dirs.slice(1)); loadAsFile(dir, opts.package, onfile); } function onfile(err, m, pkg) { if (err) return cb(err); if (m) return cb(null, m, pkg); loadAsDirectory(dir, opts.package, ondir); } function ondir(err, n, pkg) { if (err) return cb(err); if (n) return cb(null, n, pkg); processDirs(cb, dirs.slice(1)); } } function loadNodeModules(x, start, cb) { var thunk = function () { return getPackageCandidates(x, start, opts); }; processDirs( cb, packageIterator ? packageIterator(x, start, thunk, opts) : thunk() ); } };