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var core = require('./core');
var fs = require('fs');
var path = require('path');
var caller = require('./caller.js');
var nodeModulesPaths = require('./node-modules-paths.js');
var normalizeOptions = require('./normalize-options.js');
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 maybeUnwrapSymlink = function maybeUnwrapSymlink(x, opts, cb) {
if (opts && opts.preserveSymlinks === false) {
fs.realpath(x, function (realPathErr, realPath) {
if (realPathErr && realPathErr.code !== 'ENOENT') cb(realPathErr);
else cb(null, realPathErr ? x : realPath);
});
} else {
cb(null, x);
}
};
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 extensions = opts.extensions || ['.js'];
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);
maybeUnwrapSymlink(
absoluteStart,
opts,
function (err, realStart) {
if (err) cb(err);
else init(realStart);
}
);
var res;
function init(basedir) {
if ((/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/).test(x)) {
res = path.resolve(basedir, x);
if (x === '..' || x.slice(-1) === '/') res += '/';
if ((/\/$/).test(x) && res === basedir) {
loadAsDirectory(res, opts.package, onfile);
} else loadAsFile(res, opts.package, onfile);
} else loadNodeModules(x, basedir, function (err, n, pkg) {
if (err) cb(err);
else if (core[x]) return cb(null, x);
else if (n) {
return maybeUnwrapSymlink(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) {
maybeUnwrapSymlink(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);
var pkgfile = path.join(dir, '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;
}
var pkgfile = path.join(x, '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 (opts.packageFilter) {
pkg = opts.packageFilter(pkg, pkgfile);
}
if (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(dir, isdir);
function isdir(err, isdir) {
if (err) return cb(err);
if (!isdir) return processDirs(cb, dirs.slice(1));
var file = path.join(dir, x);
loadAsFile(file, opts.package, onfile);
}
function onfile(err, m, pkg) {
if (err) return cb(err);
if (m) return cb(null, m, pkg);
loadAsDirectory(path.join(dir, x), 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) {
processDirs(cb, nodeModulesPaths(start, opts, x));
}
};
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