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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');
module.exports = function (x, opts) {
if (!opts) opts = {};
var isFile = opts.isFile || function (file) {
try { var stat = fs.statSync(file) }
catch (err) { if (err && err.code === 'ENOENT') return false }
return stat.isFile() || stat.isFIFO();
};
var readFileSync = opts.readFileSync || fs.readFileSync;
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 += '/';
var m = loadAsFileSync(res) || loadAsDirectorySync(res);
if (m) return m;
} else {
var n = loadNodeModulesSync(x, y);
if (n) return n;
}
if (core[x]) return x;
throw new Error("Cannot find module '" + x + "' from '" + y + "'");
function loadAsFileSync (x) {
if (isFile(x)) {
return x;
}
for (var i = 0; i < extensions.length; i++) {
var file = x + extensions[i];
if (isFile(file)) {
return file;
}
}
}
function loadAsDirectorySync (x) {
var pkgfile = path.join(x, '/package.json');
if (isFile(pkgfile)) {
var body = readFileSync(pkgfile, 'utf8');
try {
var pkg = JSON.parse(body);
if (opts.packageFilter) {
pkg = opts.packageFilter(pkg, x);
}
if (pkg.main) {
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 (err) {}
}
return loadAsFileSync(path.join( x, '/index'));
}
function loadNodeModulesSync (x, start) {
var dirs = nodeModulesPaths(start, opts);
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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