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320 lines
11 KiB
320 lines
11 KiB
var fs = require('fs'); |
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var path = require('path'); |
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var caller = require('./caller'); |
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var nodeModulesPaths = require('./node-modules-paths'); |
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var normalizeOptions = require('./normalize-options'); |
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var isCore = require('is-core-module'); |
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|
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var realpathFS = fs.realpath && typeof fs.realpath.native === 'function' ? fs.realpath.native : fs.realpath; |
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var defaultIsFile = function isFile(file, cb) { |
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fs.stat(file, function (err, stat) { |
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if (!err) { |
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return cb(null, stat.isFile() || stat.isFIFO()); |
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} |
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if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false); |
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return cb(err); |
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}); |
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}; |
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var defaultIsDir = function isDirectory(dir, cb) { |
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fs.stat(dir, function (err, stat) { |
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if (!err) { |
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return cb(null, stat.isDirectory()); |
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} |
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if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false); |
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return cb(err); |
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}); |
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}; |
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var defaultRealpath = function realpath(x, cb) { |
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realpathFS(x, function (realpathErr, realPath) { |
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if (realpathErr && realpathErr.code !== 'ENOENT') cb(realpathErr); |
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else cb(null, realpathErr ? x : realPath); |
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}); |
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}; |
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var maybeRealpath = function maybeRealpath(realpath, x, opts, cb) { |
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if (opts && opts.preserveSymlinks === false) { |
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realpath(x, cb); |
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} else { |
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cb(null, x); |
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} |
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}; |
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var defaultReadPackage = function defaultReadPackage(readFile, pkgfile, cb) { |
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readFile(pkgfile, function (readFileErr, body) { |
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if (readFileErr) cb(readFileErr); |
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else { |
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try { |
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var pkg = JSON.parse(body); |
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cb(null, pkg); |
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} catch (jsonErr) { |
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cb(null); |
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} |
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} |
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}); |
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}; |
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var getPackageCandidates = function getPackageCandidates(x, start, opts) { |
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var dirs = nodeModulesPaths(start, opts, x); |
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for (var i = 0; i < dirs.length; i++) { |
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dirs[i] = path.join(dirs[i], x); |
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} |
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return dirs; |
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}; |
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module.exports = function resolve(x, options, callback) { |
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var cb = callback; |
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var opts = options; |
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if (typeof options === 'function') { |
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cb = opts; |
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opts = {}; |
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} |
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if (typeof x !== 'string') { |
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var err = new TypeError('Path must be a string.'); |
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return process.nextTick(function () { |
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cb(err); |
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}); |
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} |
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opts = normalizeOptions(x, opts); |
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var isFile = opts.isFile || defaultIsFile; |
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var isDirectory = opts.isDirectory || defaultIsDir; |
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var readFile = opts.readFile || fs.readFile; |
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var realpath = opts.realpath || defaultRealpath; |
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var readPackage = opts.readPackage || defaultReadPackage; |
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if (opts.readFile && opts.readPackage) { |
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var conflictErr = new TypeError('`readFile` and `readPackage` are mutually exclusive.'); |
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return process.nextTick(function () { |
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cb(conflictErr); |
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}); |
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} |
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var packageIterator = opts.packageIterator; |
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var extensions = opts.extensions || ['.js']; |
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var includeCoreModules = opts.includeCoreModules !== false; |
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var basedir = opts.basedir || path.dirname(caller()); |
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var parent = opts.filename || basedir; |
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opts.paths = opts.paths || []; |
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// ensure that `basedir` is an absolute path at this point, resolving against the process' current working directory |
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var absoluteStart = path.resolve(basedir); |
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maybeRealpath( |
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realpath, |
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absoluteStart, |
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opts, |
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function (err, realStart) { |
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if (err) cb(err); |
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else init(realStart); |
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} |
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); |
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var res; |
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function init(basedir) { |
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if ((/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/).test(x)) { |
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res = path.resolve(basedir, x); |
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if (x === '.' || x === '..' || x.slice(-1) === '/') res += '/'; |
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if ((/\/$/).test(x) && res === basedir) { |
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loadAsDirectory(res, opts.package, onfile); |
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} else loadAsFile(res, opts.package, onfile); |
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} else if (includeCoreModules && isCore(x)) { |
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return cb(null, x); |
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} else loadNodeModules(x, basedir, function (err, n, pkg) { |
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if (err) cb(err); |
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else if (n) { |
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return maybeRealpath(realpath, n, opts, function (err, realN) { |
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if (err) { |
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cb(err); |
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} else { |
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cb(null, realN, pkg); |
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} |
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}); |
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} else { |
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var moduleError = new Error("Cannot find module '" + x + "' from '" + parent + "'"); |
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moduleError.code = 'MODULE_NOT_FOUND'; |
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cb(moduleError); |
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} |
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}); |
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} |
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function onfile(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(res, function (err, d, pkg) { |
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if (err) cb(err); |
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else if (d) { |
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maybeRealpath(realpath, d, opts, function (err, realD) { |
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if (err) { |
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cb(err); |
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} else { |
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cb(null, realD, pkg); |
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} |
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}); |
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} else { |
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var moduleError = new Error("Cannot find module '" + x + "' from '" + parent + "'"); |
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moduleError.code = 'MODULE_NOT_FOUND'; |
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cb(moduleError); |
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} |
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}); |
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} |
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function loadAsFile(x, thePackage, callback) { |
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var loadAsFilePackage = thePackage; |
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var cb = callback; |
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if (typeof loadAsFilePackage === 'function') { |
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cb = loadAsFilePackage; |
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loadAsFilePackage = undefined; |
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} |
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var exts = [''].concat(extensions); |
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load(exts, x, loadAsFilePackage); |
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function load(exts, x, loadPackage) { |
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if (exts.length === 0) return cb(null, undefined, loadPackage); |
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var file = x + exts[0]; |
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var pkg = loadPackage; |
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if (pkg) onpkg(null, pkg); |
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else loadpkg(path.dirname(file), onpkg); |
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function onpkg(err, pkg_, dir) { |
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pkg = pkg_; |
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if (err) return cb(err); |
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if (dir && pkg && opts.pathFilter) { |
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var rfile = path.relative(dir, file); |
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var rel = rfile.slice(0, rfile.length - exts[0].length); |
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var r = opts.pathFilter(pkg, x, rel); |
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if (r) return load( |
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[''].concat(extensions.slice()), |
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path.resolve(dir, r), |
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pkg |
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); |
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} |
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isFile(file, onex); |
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} |
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function onex(err, ex) { |
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if (err) return cb(err); |
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if (ex) return cb(null, file, pkg); |
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load(exts.slice(1), x, pkg); |
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} |
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} |
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} |
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function loadpkg(dir, cb) { |
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if (dir === '' || dir === '/') return cb(null); |
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if (process.platform === 'win32' && (/^\w:[/\\]*$/).test(dir)) { |
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return cb(null); |
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} |
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if ((/[/\\]node_modules[/\\]*$/).test(dir)) return cb(null); |
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maybeRealpath(realpath, dir, opts, function (unwrapErr, pkgdir) { |
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if (unwrapErr) return loadpkg(path.dirname(dir), cb); |
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var pkgfile = path.join(pkgdir, 'package.json'); |
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isFile(pkgfile, function (err, ex) { |
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// on err, ex is false |
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if (!ex) return loadpkg(path.dirname(dir), cb); |
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readPackage(readFile, pkgfile, function (err, pkgParam) { |
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if (err) cb(err); |
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var pkg = pkgParam; |
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if (pkg && opts.packageFilter) { |
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pkg = opts.packageFilter(pkg, pkgfile); |
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} |
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cb(null, pkg, dir); |
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}); |
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}); |
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}); |
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} |
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function loadAsDirectory(x, loadAsDirectoryPackage, callback) { |
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var cb = callback; |
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var fpkg = loadAsDirectoryPackage; |
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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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maybeRealpath(realpath, x, opts, function (unwrapErr, pkgdir) { |
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if (unwrapErr) return cb(unwrapErr); |
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var pkgfile = path.join(pkgdir, '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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readPackage(readFile, pkgfile, function (err, pkgParam) { |
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if (err) return cb(err); |
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var pkg = pkgParam; |
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if (pkg && opts.packageFilter) { |
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pkg = opts.packageFilter(pkg, pkgfile); |
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} |
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if (pkg && pkg.main) { |
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if (typeof pkg.main !== 'string') { |
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var mainError = new TypeError('package “' + pkg.name + '” `main` must be a string'); |
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mainError.code = 'INVALID_PACKAGE_MAIN'; |
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return cb(mainError); |
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} |
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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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} |
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function processDirs(cb, 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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isDirectory(path.dirname(dir), isdir); |
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function isdir(err, isdir) { |
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if (err) return cb(err); |
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if (!isdir) return processDirs(cb, dirs.slice(1)); |
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loadAsFile(dir, opts.package, onfile); |
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} |
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function onfile(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(dir, opts.package, ondir); |
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} |
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function ondir(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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processDirs(cb, dirs.slice(1)); |
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} |
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} |
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function loadNodeModules(x, start, cb) { |
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var thunk = function () { return getPackageCandidates(x, start, opts); }; |
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processDirs( |
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cb, |
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packageIterator ? packageIterator(x, start, thunk, opts) : thunk() |
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); |
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} |
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};
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