| 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(); |
| }; |
| |
| var defaultIsDir = function isDirectory(dir) { |
| try { |
| var stat = fs.statSync(dir); |
| } catch (e) { |
| if (e && (e.code === 'ENOENT' || e.code === 'ENOTDIR')) return false; |
| throw e; |
| } |
| return stat.isDirectory(); |
| }; |
| |
| var maybeUnwrapSymlink = function maybeUnwrapSymlink(x, opts) { |
| if (opts && opts.preserveSymlinks === false) { |
| try { |
| return fs.realpathSync(x); |
| } catch (realPathErr) { |
| if (realPathErr.code !== 'ENOENT') { |
| throw realPathErr; |
| } |
| } |
| } |
| return x; |
| }; |
| |
| 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 isDirectory = opts.isDirectory || defaultIsDir; |
| |
| 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 = maybeUnwrapSymlink(path.resolve(basedir), opts); |
| |
| if ((/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/).test(x)) { |
| var res = path.resolve(absoluteStart, x); |
| if (x === '..' || x.slice(-1) === '/') res += '/'; |
| var m = loadAsFileSync(res) || loadAsDirectorySync(res); |
| if (m) return maybeUnwrapSymlink(m, opts); |
| } else if (core[x]) { |
| return x; |
| } else { |
| var n = loadNodeModulesSync(x, absoluteStart); |
| if (n) return maybeUnwrapSymlink(n, opts); |
| } |
| |
| if (core[x]) return x; |
| |
| var err = new Error("Cannot find module '" + x + "' from '" + parent + "'"); |
| err.code = 'MODULE_NOT_FOUND'; |
| throw err; |
| |
| function loadAsFileSync(x) { |
| var pkg = loadpkg(path.dirname(x)); |
| |
| if (pkg && pkg.dir && pkg.pkg && opts.pathFilter) { |
| var rfile = path.relative(pkg.dir, x); |
| var r = opts.pathFilter(pkg.pkg, x, rfile); |
| if (r) { |
| x = path.resolve(pkg.dir, r); // eslint-disable-line no-param-reassign |
| } |
| } |
| |
| if (isFile(x)) { |
| return x; |
| } |
| |
| for (var i = 0; i < extensions.length; i++) { |
| var file = x + extensions[i]; |
| if (isFile(file)) { |
| return file; |
| } |
| } |
| } |
| |
| function loadpkg(dir) { |
| if (dir === '' || dir === '/') return; |
| if (process.platform === 'win32' && (/^\w:[/\\]*$/).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]; |
| if (isDirectory(dir)) { |
| var m = loadAsFileSync(path.join(dir, '/', x)); |
| if (m) return m; |
| var n = loadAsDirectorySync(path.join(dir, '/', x)); |
| if (n) return n; |
| } |
| } |
| } |
| }; |