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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 splitRe = process.platform === 'win32' ? /[\/\\]/ : /\//;
module.exports = function resolve (x, opts, cb) {
if (typeof opts === 'function') {
cb = opts;
opts = {};
}
if (!opts) opts = {};
if (typeof x !== 'string') {
return process.nextTick(function () {
cb(new Error('path must be a string'));
});
}
var isFile = opts.isFile || function (file, cb) {
fs.stat(file, function (err, stat) {
if (err && err.code === 'ENOENT') cb(null, false)
else if (err) cb(err)
else cb(null, stat.isFile() || stat.isFIFO())
});
};
var readFile = opts.readFile || fs.readFile;
var extensions = opts.extensions || [ '.js' ];
var y = opts.basedir || path.dirname(caller());
opts.paths = opts.paths || [];
if (/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[\\\/])/.test(x)) {
var res = path.resolve(y, x);
if (x === '..') res += '/';
if (/\/$/.test(x) && res === y) {
loadAsDirectory(res, opts.package, onfile);
}
else loadAsFile(res, opts.package, onfile);
}
else loadNodeModules(x, y, function (err, n, pkg) {
if (err) cb(err)
else if (n) cb(null, n, pkg)
else if (core[x]) return cb(null, x);
else cb(new Error("Cannot find module '" + x + "' from '" + y + "'"))
});
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) cb(null, d, pkg)
else cb(new Error("Cannot find module '" + x + "' from '" + y + "'"))
})
}
function loadAsFile (x, pkg, cb) {
if (typeof pkg === 'function') {
cb = pkg;
pkg = undefined;
}
var exts = [''].concat(extensions);
load(exts, x, pkg)
function load (exts, x, pkg) {
if (exts.length === 0) return cb(null, undefined, pkg);
var file = x + exts[0];
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) cb(err)
else if (!ex) load(exts.slice(1), x, pkg)
else cb(null, file, 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 (err) {}
if (pkg && opts.packageFilter) {
pkg = opts.packageFilter(pkg, pkgfile);
}
cb(null, pkg, dir);
});
});
}
function loadAsDirectory (x, fpkg, cb) {
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 (err) {}
if (opts.packageFilter) {
pkg = opts.packageFilter(pkg, pkgfile);
}
if (pkg.main) {
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 loadNodeModules (x, start, cb) {
(function process (dirs) {
if (dirs.length === 0) return cb(null, undefined);
var dir = dirs[0];
var file = path.join(dir, '/', x);
loadAsFile(file, undefined, onfile);
function onfile (err, m, pkg) {
if (err) return cb(err);
if (m) return cb(null, m, pkg);
loadAsDirectory(path.join(dir, '/', x), undefined, ondir);
}
function ondir (err, n, pkg) {
if (err) return cb(err);
if (n) return cb(null, n, pkg);
process(dirs.slice(1));
}
})(nodeModulesPaths(start, opts));
}
};
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