/
async.js
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/
async.js
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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 resolve (x, opts, cb) {
if (typeof opts === 'function') {
cb = opts;
opts = {};
}
if (!opts) opts = {};
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());
var modules = opts.moduleDirectory || 'node_modules';
opts.paths = opts.paths || [];
if (x.match(/^(?:\.\.?\/|\/|([A-Za-z]:)?\\)/)) {
loadAsFile(path.resolve(y, x), function (err, m, pkg) {
if (err) cb(err)
else if (m) cb(null, m, pkg)
else loadAsDirectory(path.resolve(y, x), 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 + "'"))
})
});
}
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 loadAsFile (x, pkg, cb) {
if (typeof pkg === 'function') {
cb = pkg;
pkg = opts.package;
}
(function load (exts) {
if (exts.length === 0) return cb(null, undefined, pkg);
var file = x + exts[0];
isFile(file, function (err, ex) {
if (err) cb(err)
else if (ex) cb(null, file, pkg)
else load(exts.slice(1))
});
})([''].concat(extensions));
}
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, x);
}
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];
loadAsFile(path.join(dir, '/', x), undefined, function (err, m, pkg) {
if (err) return cb(err);
if (m) return cb(null, m, pkg);
loadAsDirectory(path.join(dir, '/', x), undefined, function (err, n, pkg) {
if (err) return cb(err);
if (n) return cb(null, n, pkg);
process(dirs.slice(1));
});
});
})(nodeModulesPaths(start, opts));
}
};