var fs = require('fs');
|
var getHomedir = require('./homedir');
|
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 = process.platform !== 'win32' && fs.realpath && typeof fs.realpath.native === 'function' ? fs.realpath.native : fs.realpath;
|
|
var homedir = getHomedir();
|
var defaultPaths = function () {
|
return [
|
path.join(homedir, '.node_modules'),
|
path.join(homedir, '.node_libraries')
|
];
|
};
|
|
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 defaultReadPackage = function defaultReadPackage(readFile, pkgfile, cb) {
|
readFile(pkgfile, function (readFileErr, body) {
|
if (readFileErr) cb(readFileErr);
|
else {
|
try {
|
var pkg = JSON.parse(body);
|
cb(null, pkg);
|
} catch (jsonErr) {
|
cb(null);
|
}
|
}
|
});
|
};
|
|
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 readPackage = opts.readPackage || defaultReadPackage;
|
if (opts.readFile && opts.readPackage) {
|
var conflictErr = new TypeError('`readFile` and `readPackage` are mutually exclusive.');
|
return process.nextTick(function () {
|
cb(conflictErr);
|
});
|
}
|
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 || defaultPaths();
|
|
// 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);
|
|
readPackage(readFile, pkgfile, function (err, pkgParam) {
|
if (err) cb(err);
|
|
var pkg = pkgParam;
|
|
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);
|
|
readPackage(readFile, pkgfile, function (err, pkgParam) {
|
if (err) return cb(err);
|
|
var pkg = pkgParam;
|
|
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()
|
);
|
}
|
};
|
