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128 lines
4.4 KiB
JavaScript
128 lines
4.4 KiB
JavaScript
var core = require('./core');
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var fs = require('fs');
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var path = require('path');
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var caller = require('./caller.js');
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var nodeModulesPaths = require('./node-modules-paths.js');
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module.exports = function resolve (x, opts, cb) {
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if (typeof opts === 'function') {
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cb = opts;
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opts = {};
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}
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if (!opts) opts = {};
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var isFile = opts.isFile || function (file, cb) {
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fs.stat(file, function (err, stat) {
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if (err && err.code === 'ENOENT') cb(null, false)
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else if (err) cb(err)
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else cb(null, stat.isFile() || stat.isFIFO())
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});
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};
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var readFile = opts.readFile || fs.readFile;
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var extensions = opts.extensions || [ '.js' ];
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var y = opts.basedir || path.dirname(caller());
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var modules = opts.moduleDirectory || 'node_modules';
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opts.paths = opts.paths || [];
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if (x.match(/^(?:\.\.?\/|\/|([A-Za-z]:)?\\)/)) {
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loadAsFile(path.resolve(y, x), function (err, m, pkg) {
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if (err) cb(err)
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else if (m) cb(null, m, pkg)
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else loadAsDirectory(path.resolve(y, x), function (err, d, pkg) {
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if (err) cb(err)
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else if (d) cb(null, d, pkg)
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else cb(new Error("Cannot find module '" + x + "' from '" + y + "'"))
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})
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});
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}
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else loadNodeModules(x, y, function (err, n, pkg) {
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if (err) cb(err)
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else if (n) cb(null, n, pkg)
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else if (core[x]) return cb(null, x);
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else cb(new Error("Cannot find module '" + x + "' from '" + y + "'"))
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});
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function loadAsFile (x, pkg, cb) {
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if (typeof pkg === 'function') {
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cb = pkg;
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pkg = opts.package;
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}
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(function load (exts) {
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if (exts.length === 0) return cb(null, undefined, pkg);
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var file = x + exts[0];
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isFile(file, function (err, ex) {
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if (err) cb(err)
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else if (ex) cb(null, file, pkg)
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else load(exts.slice(1))
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});
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})([''].concat(extensions));
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}
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function loadAsDirectory (x, fpkg, cb) {
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if (typeof fpkg === 'function') {
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cb = fpkg;
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fpkg = opts.package;
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}
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var pkgfile = path.join(x, '/package.json');
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isFile(pkgfile, function (err, ex) {
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if (err) return cb(err);
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if (!ex) return loadAsFile(path.join(x, '/index'), fpkg, cb);
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readFile(pkgfile, function (err, body) {
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if (err) return cb(err);
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try {
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var pkg = JSON.parse(body);
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}
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catch (err) {}
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if (opts.packageFilter) {
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pkg = opts.packageFilter(pkg, x);
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}
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if (pkg.main) {
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if (pkg.main === '.' || pkg.main === './'){
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pkg.main = 'index'
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}
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loadAsFile(path.resolve(x, pkg.main), pkg, function (err, m, pkg) {
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if (err) return cb(err);
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if (m) return cb(null, m, pkg);
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if (!pkg) return loadAsFile(path.join(x, '/index'), pkg, cb);
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var dir = path.resolve(x, pkg.main);
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loadAsDirectory(dir, pkg, function (err, n, pkg) {
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if (err) return cb(err);
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if (n) return cb(null, n, pkg);
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loadAsFile(path.join(x, '/index'), pkg, cb);
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});
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});
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return;
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}
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loadAsFile(path.join(x, '/index'), pkg, cb);
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});
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});
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}
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function loadNodeModules (x, start, cb) {
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(function process (dirs) {
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if (dirs.length === 0) return cb(null, undefined);
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var dir = dirs[0];
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loadAsFile(path.join(dir, '/', x), undefined, function (err, m, pkg) {
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if (err) return cb(err);
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if (m) return cb(null, m, pkg);
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loadAsDirectory(path.join(dir, '/', x), undefined, function (err, n, pkg) {
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if (err) return cb(err);
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if (n) return cb(null, n, pkg);
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process(dirs.slice(1));
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});
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});
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})(nodeModulesPaths(start, opts));
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}
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};
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