source: trip-planner-front/node_modules/resolve/lib/async.js@ 6a3a178

Last change on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit
  • Property mode set to 100644
File size: 10.9 KB
Line 
1var fs = require('fs');
2var path = require('path');
3var caller = require('./caller');
4var nodeModulesPaths = require('./node-modules-paths');
5var normalizeOptions = require('./normalize-options');
6var isCore = require('is-core-module');
7
8var realpathFS = fs.realpath && typeof fs.realpath.native === 'function' ? fs.realpath.native : fs.realpath;
9
10var defaultIsFile = function isFile(file, cb) {
11 fs.stat(file, function (err, stat) {
12 if (!err) {
13 return cb(null, stat.isFile() || stat.isFIFO());
14 }
15 if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false);
16 return cb(err);
17 });
18};
19
20var defaultIsDir = function isDirectory(dir, cb) {
21 fs.stat(dir, function (err, stat) {
22 if (!err) {
23 return cb(null, stat.isDirectory());
24 }
25 if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false);
26 return cb(err);
27 });
28};
29
30var defaultRealpath = function realpath(x, cb) {
31 realpathFS(x, function (realpathErr, realPath) {
32 if (realpathErr && realpathErr.code !== 'ENOENT') cb(realpathErr);
33 else cb(null, realpathErr ? x : realPath);
34 });
35};
36
37var maybeRealpath = function maybeRealpath(realpath, x, opts, cb) {
38 if (opts && opts.preserveSymlinks === false) {
39 realpath(x, cb);
40 } else {
41 cb(null, x);
42 }
43};
44
45var defaultReadPackage = function defaultReadPackage(readFile, pkgfile, cb) {
46 readFile(pkgfile, function (readFileErr, body) {
47 if (readFileErr) cb(readFileErr);
48 else {
49 try {
50 var pkg = JSON.parse(body);
51 cb(null, pkg);
52 } catch (jsonErr) {
53 cb(null);
54 }
55 }
56 });
57};
58
59var getPackageCandidates = function getPackageCandidates(x, start, opts) {
60 var dirs = nodeModulesPaths(start, opts, x);
61 for (var i = 0; i < dirs.length; i++) {
62 dirs[i] = path.join(dirs[i], x);
63 }
64 return dirs;
65};
66
67module.exports = function resolve(x, options, callback) {
68 var cb = callback;
69 var opts = options;
70 if (typeof options === 'function') {
71 cb = opts;
72 opts = {};
73 }
74 if (typeof x !== 'string') {
75 var err = new TypeError('Path must be a string.');
76 return process.nextTick(function () {
77 cb(err);
78 });
79 }
80
81 opts = normalizeOptions(x, opts);
82
83 var isFile = opts.isFile || defaultIsFile;
84 var isDirectory = opts.isDirectory || defaultIsDir;
85 var readFile = opts.readFile || fs.readFile;
86 var realpath = opts.realpath || defaultRealpath;
87 var readPackage = opts.readPackage || defaultReadPackage;
88 if (opts.readFile && opts.readPackage) {
89 var conflictErr = new TypeError('`readFile` and `readPackage` are mutually exclusive.');
90 return process.nextTick(function () {
91 cb(conflictErr);
92 });
93 }
94 var packageIterator = opts.packageIterator;
95
96 var extensions = opts.extensions || ['.js'];
97 var includeCoreModules = opts.includeCoreModules !== false;
98 var basedir = opts.basedir || path.dirname(caller());
99 var parent = opts.filename || basedir;
100
101 opts.paths = opts.paths || [];
102
103 // ensure that `basedir` is an absolute path at this point, resolving against the process' current working directory
104 var absoluteStart = path.resolve(basedir);
105
106 maybeRealpath(
107 realpath,
108 absoluteStart,
109 opts,
110 function (err, realStart) {
111 if (err) cb(err);
112 else init(realStart);
113 }
114 );
115
116 var res;
117 function init(basedir) {
118 if ((/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/).test(x)) {
119 res = path.resolve(basedir, x);
120 if (x === '.' || x === '..' || x.slice(-1) === '/') res += '/';
121 if ((/\/$/).test(x) && res === basedir) {
122 loadAsDirectory(res, opts.package, onfile);
123 } else loadAsFile(res, opts.package, onfile);
124 } else if (includeCoreModules && isCore(x)) {
125 return cb(null, x);
126 } else loadNodeModules(x, basedir, function (err, n, pkg) {
127 if (err) cb(err);
128 else if (n) {
129 return maybeRealpath(realpath, n, opts, function (err, realN) {
130 if (err) {
131 cb(err);
132 } else {
133 cb(null, realN, pkg);
134 }
135 });
136 } else {
137 var moduleError = new Error("Cannot find module '" + x + "' from '" + parent + "'");
138 moduleError.code = 'MODULE_NOT_FOUND';
139 cb(moduleError);
140 }
141 });
142 }
143
144 function onfile(err, m, pkg) {
145 if (err) cb(err);
146 else if (m) cb(null, m, pkg);
147 else loadAsDirectory(res, function (err, d, pkg) {
148 if (err) cb(err);
149 else if (d) {
150 maybeRealpath(realpath, d, opts, function (err, realD) {
151 if (err) {
152 cb(err);
153 } else {
154 cb(null, realD, pkg);
155 }
156 });
157 } else {
158 var moduleError = new Error("Cannot find module '" + x + "' from '" + parent + "'");
159 moduleError.code = 'MODULE_NOT_FOUND';
160 cb(moduleError);
161 }
162 });
163 }
164
165 function loadAsFile(x, thePackage, callback) {
166 var loadAsFilePackage = thePackage;
167 var cb = callback;
168 if (typeof loadAsFilePackage === 'function') {
169 cb = loadAsFilePackage;
170 loadAsFilePackage = undefined;
171 }
172
173 var exts = [''].concat(extensions);
174 load(exts, x, loadAsFilePackage);
175
176 function load(exts, x, loadPackage) {
177 if (exts.length === 0) return cb(null, undefined, loadPackage);
178 var file = x + exts[0];
179
180 var pkg = loadPackage;
181 if (pkg) onpkg(null, pkg);
182 else loadpkg(path.dirname(file), onpkg);
183
184 function onpkg(err, pkg_, dir) {
185 pkg = pkg_;
186 if (err) return cb(err);
187 if (dir && pkg && opts.pathFilter) {
188 var rfile = path.relative(dir, file);
189 var rel = rfile.slice(0, rfile.length - exts[0].length);
190 var r = opts.pathFilter(pkg, x, rel);
191 if (r) return load(
192 [''].concat(extensions.slice()),
193 path.resolve(dir, r),
194 pkg
195 );
196 }
197 isFile(file, onex);
198 }
199 function onex(err, ex) {
200 if (err) return cb(err);
201 if (ex) return cb(null, file, pkg);
202 load(exts.slice(1), x, pkg);
203 }
204 }
205 }
206
207 function loadpkg(dir, cb) {
208 if (dir === '' || dir === '/') return cb(null);
209 if (process.platform === 'win32' && (/^\w:[/\\]*$/).test(dir)) {
210 return cb(null);
211 }
212 if ((/[/\\]node_modules[/\\]*$/).test(dir)) return cb(null);
213
214 maybeRealpath(realpath, dir, opts, function (unwrapErr, pkgdir) {
215 if (unwrapErr) return loadpkg(path.dirname(dir), cb);
216 var pkgfile = path.join(pkgdir, 'package.json');
217 isFile(pkgfile, function (err, ex) {
218 // on err, ex is false
219 if (!ex) return loadpkg(path.dirname(dir), cb);
220
221 readPackage(readFile, pkgfile, function (err, pkgParam) {
222 if (err) cb(err);
223
224 var pkg = pkgParam;
225
226 if (pkg && opts.packageFilter) {
227 pkg = opts.packageFilter(pkg, pkgfile);
228 }
229 cb(null, pkg, dir);
230 });
231 });
232 });
233 }
234
235 function loadAsDirectory(x, loadAsDirectoryPackage, callback) {
236 var cb = callback;
237 var fpkg = loadAsDirectoryPackage;
238 if (typeof fpkg === 'function') {
239 cb = fpkg;
240 fpkg = opts.package;
241 }
242
243 maybeRealpath(realpath, x, opts, function (unwrapErr, pkgdir) {
244 if (unwrapErr) return cb(unwrapErr);
245 var pkgfile = path.join(pkgdir, 'package.json');
246 isFile(pkgfile, function (err, ex) {
247 if (err) return cb(err);
248 if (!ex) return loadAsFile(path.join(x, 'index'), fpkg, cb);
249
250 readPackage(readFile, pkgfile, function (err, pkgParam) {
251 if (err) return cb(err);
252
253 var pkg = pkgParam;
254
255 if (pkg && opts.packageFilter) {
256 pkg = opts.packageFilter(pkg, pkgfile);
257 }
258
259 if (pkg && pkg.main) {
260 if (typeof pkg.main !== 'string') {
261 var mainError = new TypeError('package “' + pkg.name + '” `main` must be a string');
262 mainError.code = 'INVALID_PACKAGE_MAIN';
263 return cb(mainError);
264 }
265 if (pkg.main === '.' || pkg.main === './') {
266 pkg.main = 'index';
267 }
268 loadAsFile(path.resolve(x, pkg.main), pkg, function (err, m, pkg) {
269 if (err) return cb(err);
270 if (m) return cb(null, m, pkg);
271 if (!pkg) return loadAsFile(path.join(x, 'index'), pkg, cb);
272
273 var dir = path.resolve(x, pkg.main);
274 loadAsDirectory(dir, pkg, function (err, n, pkg) {
275 if (err) return cb(err);
276 if (n) return cb(null, n, pkg);
277 loadAsFile(path.join(x, 'index'), pkg, cb);
278 });
279 });
280 return;
281 }
282
283 loadAsFile(path.join(x, '/index'), pkg, cb);
284 });
285 });
286 });
287 }
288
289 function processDirs(cb, dirs) {
290 if (dirs.length === 0) return cb(null, undefined);
291 var dir = dirs[0];
292
293 isDirectory(path.dirname(dir), isdir);
294
295 function isdir(err, isdir) {
296 if (err) return cb(err);
297 if (!isdir) return processDirs(cb, dirs.slice(1));
298 loadAsFile(dir, opts.package, onfile);
299 }
300
301 function onfile(err, m, pkg) {
302 if (err) return cb(err);
303 if (m) return cb(null, m, pkg);
304 loadAsDirectory(dir, opts.package, ondir);
305 }
306
307 function ondir(err, n, pkg) {
308 if (err) return cb(err);
309 if (n) return cb(null, n, pkg);
310 processDirs(cb, dirs.slice(1));
311 }
312 }
313 function loadNodeModules(x, start, cb) {
314 var thunk = function () { return getPackageCandidates(x, start, opts); };
315 processDirs(
316 cb,
317 packageIterator ? packageIterator(x, start, thunk, opts) : thunk()
318 );
319 }
320};
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