diff options
Diffstat (limited to 'node_modules/resolve/lib/async.js')
| -rw-r--r-- | node_modules/resolve/lib/async.js | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/node_modules/resolve/lib/async.js b/node_modules/resolve/lib/async.js new file mode 100644 index 00000000..296b5ffa --- /dev/null +++ b/node_modules/resolve/lib/async.js @@ -0,0 +1,206 @@ +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, cb) { + fs.stat(file, function (err, stat) { + if (!err) { + return cb(null, stat.isFile() || stat.isFIFO()); + } + if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false); + return cb(err); + }); +}; + +module.exports = function resolve(x, options, callback) { + var cb = callback; + var opts = options || {}; + if (typeof opts === 'function') { + cb = opts; + opts = {}; + } + if (typeof x !== 'string') { + var err = new TypeError('Path must be a string.'); + return process.nextTick(function () { + cb(err); + }); + } + + var isFile = opts.isFile || defaultIsFile; + var readFile = opts.readFile || fs.readFile; + + var extensions = opts.extensions || ['.js']; + var basedir = opts.basedir || path.dirname(caller()); + var parent = opts.filename || basedir; + + opts.paths = opts.paths || []; + + if (/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/.test(x)) { + var res = path.resolve(basedir, x); + if (x === '..' || x.slice(-1) === '/') res += '/'; + if (/\/$/.test(x) && res === basedir) { + loadAsDirectory(res, opts.package, onfile); + } else loadAsFile(res, opts.package, onfile); + } else loadNodeModules(x, basedir, function (err, n, pkg) { + if (err) cb(err); + else if (n) cb(null, n, pkg); + else if (core[x]) return cb(null, x); + else { + var moduleError = new Error("Cannot find module '" + x + "' from '" + parent + "'"); + moduleError.code = 'MODULE_NOT_FOUND'; + cb(moduleError); + } + }); + + function onfile(err, m, pkg) { + if (err) cb(err); + else if (m) cb(null, m, pkg); + else loadAsDirectory(res, function (err, d, pkg) { + if (err) cb(err); + else if (d) cb(null, d, pkg); + else { + var moduleError = new Error("Cannot find module '" + x + "' from '" + parent + "'"); + moduleError.code = 'MODULE_NOT_FOUND'; + cb(moduleError); + } + }); + } + + function loadAsFile(x, thePackage, callback) { + var loadAsFilePackage = thePackage; + var cb = callback; + if (typeof loadAsFilePackage === 'function') { + cb = loadAsFilePackage; + loadAsFilePackage = undefined; + } + + var exts = [''].concat(extensions); + load(exts, x, loadAsFilePackage); + + function load(exts, x, loadPackage) { + if (exts.length === 0) return cb(null, undefined, loadPackage); + var file = x + exts[0]; + + var pkg = loadPackage; + if (pkg) onpkg(null, pkg); + else loadpkg(path.dirname(file), onpkg); + + function onpkg(err, pkg_, dir) { + pkg = pkg_; + if (err) return cb(err); + if (dir && pkg && opts.pathFilter) { + var rfile = path.relative(dir, file); + var rel = rfile.slice(0, rfile.length - exts[0].length); + var r = opts.pathFilter(pkg, x, rel); + if (r) return load( + [''].concat(extensions.slice()), + path.resolve(dir, r), + pkg + ); + } + isFile(file, onex); + } + function onex(err, ex) { + if (err) return cb(err); + if (ex) return cb(null, file, pkg); + load(exts.slice(1), x, pkg); + } + } + } + + function loadpkg(dir, cb) { + if (dir === '' || dir === '/') return cb(null); + if (process.platform === 'win32' && (/^\w:[/\\]*$/).test(dir)) { + return cb(null); + } + if (/[/\\]node_modules[/\\]*$/.test(dir)) return cb(null); + + var pkgfile = path.join(dir, 'package.json'); + isFile(pkgfile, function (err, ex) { + // on err, ex is false + if (!ex) return loadpkg(path.dirname(dir), cb); + + readFile(pkgfile, function (err, body) { + if (err) cb(err); + try { var pkg = JSON.parse(body); } catch (jsonErr) {} + + if (pkg && opts.packageFilter) { + pkg = opts.packageFilter(pkg, pkgfile); + } + cb(null, pkg, dir); + }); + }); + } + + function loadAsDirectory(x, loadAsDirectoryPackage, callback) { + var cb = callback; + var fpkg = loadAsDirectoryPackage; + 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 (jsonErr) {} + + if (opts.packageFilter) { + pkg = opts.packageFilter(pkg, pkgfile); + } + + 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 processDirs(cb, dirs) { + if (dirs.length === 0) return cb(null, undefined); + var dir = dirs[0]; + + var file = path.join(dir, x); + loadAsFile(file, opts.package, onfile); + + function onfile(err, m, pkg) { + if (err) return cb(err); + if (m) return cb(null, m, pkg); + loadAsDirectory(path.join(dir, x), opts.package, ondir); + } + + function ondir(err, n, pkg) { + if (err) return cb(err); + if (n) return cb(null, n, pkg); + processDirs(cb, dirs.slice(1)); + } + } + function loadNodeModules(x, start, cb) { + processDirs(cb, nodeModulesPaths(start, opts)); + } +}; |