| 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 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 = options || {}; |
| var isFile = opts.isFile || defaultIsFile; |
| var readFileSync = opts.readFileSync || fs.readFileSync; |
| |
| var extensions = opts.extensions || ['.js']; |
| var basedir = opts.basedir || path.dirname(caller()); |
| |
| opts.paths = opts.paths || []; |
| |
| if (/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/.test(x)) { |
| var res = path.resolve(basedir, x); |
| if (x === '..' || x.slice(-1) === '/') res += '/'; |
| var m = loadAsFileSync(res) || loadAsDirectorySync(res); |
| if (m) return m; |
| } else { |
| var n = loadNodeModulesSync(x, basedir); |
| if (n) return n; |
| } |
| |
| if (core[x]) return x; |
| |
| var err = new Error("Cannot find module '" + x + "' from '" + basedir + "'"); |
| err.code = 'MODULE_NOT_FOUND'; |
| throw err; |
| |
| function loadAsFileSync(x) { |
| var pkg = loadpkg(path.dirname(x)); |
| |
| if (pkg && pkg.dir && pkg.pkg && opts.pathFilter) { |
| var rfile = path.relative(pkg.dir, x); |
| var r = opts.pathFilter(pkg.pkg, x, rfile); |
| if (r) { |
| x = path.resolve(pkg.dir, r); // eslint-disable-line no-param-reassign |
| } |
| } |
| |
| if (isFile(x)) { |
| return x; |
| } |
| |
| for (var i = 0; i < extensions.length; i++) { |
| var file = x + extensions[i]; |
| if (isFile(file)) { |
| return file; |
| } |
| } |
| } |
| |
| function loadpkg(dir) { |
| if (dir === '' || dir === '/') return; |
| if (process.platform === 'win32' && (/^\w:[/\\]*$/).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); |
| |
| if (opts.packageFilter) { |
| pkg = opts.packageFilter(pkg, x); |
| } |
| |
| if (pkg.main) { |
| if (pkg.main === '.' || pkg.main === './') { |
| pkg.main = 'index'; |
| } |
| 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); |
| 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; |
| } |
| } |
| }; |