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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) {
try {
var stat = fs.statSync(file);
} catch (e) {
if (e && (e.code === 'ENOENT' || e.code === 'ENOTDIR')) return false;
throw e;
}
return stat.isFile() || stat.isFIFO();
};
module.exports = function (x, options) {
if (typeof x !== 'string') {
throw new TypeError('Path must be a string.');
}
var opts = normalizeOptions(x, options);
var isFile = opts.isFile || defaultIsFile;
var readFileSync = opts.readFileSync || fs.readFileSync;
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);
if (opts.preserveSymlinks === false) {
try {
absoluteStart = fs.realpathSync(absoluteStart);
} catch (realPathErr) {
if (realPathErr.code !== 'ENOENT') {
throw realPathErr;
}
}
}
if ((/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/).test(x)) {
var res = path.resolve(absoluteStart, x);
if (x === '..' || x.slice(-1) === '/') res += '/';
var m = loadAsFileSync(res) || loadAsDirectorySync(res);
if (m) return m;
} else {
var n = loadNodeModulesSync(x, absoluteStart);
if (n) return n;
}
if (core[x]) return x;
var err = new Error("Cannot find module '" + x + "' from '" + parent + "'");
err.code = 'MODULE_NOT_FOUND';
throw err;
function loadAsFileSync(x) {
var pkg = loadpkg(path.dirname(x));
if (pkg && pkg.dir && pkg.pkg && opts.pathFilter) {
var rfile = path.relative(pkg.dir, x);
var r = opts.pathFilter(pkg.pkg, x, rfile);
if (r) {
x = path.resolve(pkg.dir, r); // eslint-disable-line no-param-reassign
}
}
if (isFile(x)) {
return x;
}
for (var i = 0; i < extensions.length; i++) {
var file = x + extensions[i];
if (isFile(file)) {
return file;
}
}
}
function loadpkg(dir) {
if (dir === '' || dir === '/') return;
if (process.platform === 'win32' && (/^\w:[/\\]*$/).test(dir)) {
return;
}
if ((/[/\\]node_modules[/\\]*$/).test(dir)) return;
var pkgfile = path.join(dir, 'package.json');
if (!isFile(pkgfile)) {
return loadpkg(path.dirname(dir));
}
var body = readFileSync(pkgfile);
try {
var pkg = JSON.parse(body);
} catch (jsonErr) {}
if (pkg && opts.packageFilter) {
pkg = opts.packageFilter(pkg, dir);
}
return { pkg: pkg, dir: dir };
}
function loadAsDirectorySync(x) {
var pkgfile = path.join(x, '/package.json');
if (isFile(pkgfile)) {
try {
var body = readFileSync(pkgfile, 'UTF8');
var pkg = JSON.parse(body);
} catch (e) {}
if (opts.packageFilter) {
pkg = opts.packageFilter(pkg, x);
}
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';
throw mainError;
}
if (pkg.main === '.' || pkg.main === './') {
pkg.main = 'index';
}
try {
var m = loadAsFileSync(path.resolve(x, pkg.main));
if (m) return m;
var n = loadAsDirectorySync(path.resolve(x, pkg.main));
if (n) return n;
} catch (e) {}
}
}
return loadAsFileSync(path.join(x, '/index'));
}
function loadNodeModulesSync(x, start) {
var dirs = nodeModulesPaths(start, opts, x);
for (var i = 0; i < dirs.length; i++) {
var dir = dirs[i];
var m = loadAsFileSync(path.join(dir, '/', x));
if (m) return m;
var n = loadAsDirectorySync(path.join(dir, '/', x));
if (n) return n;
}
}
};
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