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671 lines (570 loc) · 19.6 KB
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';
const NativeModule = require('native_module');
const util = require('util');
const internalModule = require('internal/module');
const vm = require('vm');
const assert = require('assert').ok;
const fs = require('fs');
const internalFS = require('internal/fs');
const path = require('path');
const internalModuleReadFile = process.binding('fs').internalModuleReadFile;
const internalModuleStat = process.binding('fs').internalModuleStat;
const preserveSymlinks = !!process.binding('config').preserveSymlinks;
function stat(filename) {
filename = path._makeLong(filename);
const cache = stat.cache;
if (cache !== null) {
const result = cache.get(filename);
if (result !== undefined) return result;
}
const result = internalModuleStat(filename);
if (cache !== null) cache.set(filename, result);
return result;
}
stat.cache = null;
function Module(id, parent) {
this.id = id;
this.exports = {};
this.parent = parent;
if (parent && parent.children) {
parent.children.push(this);
}
this.filename = null;
this.loaded = false;
this.children = [];
}
module.exports = Module;
Module._cache = Object.create(null);
Module._pathCache = Object.create(null);
Module._extensions = Object.create(null);
var modulePaths = [];
Module.globalPaths = [];
Module.wrapper = NativeModule.wrapper;
Module.wrap = NativeModule.wrap;
Module._debug = util.debuglog('module');
// We use this alias for the preprocessor that filters it out
const debug = Module._debug;
// given a module name, and a list of paths to test, returns the first
// matching file in the following precedence.
//
// require("a.<ext>")
// -> a.<ext>
//
// require("a")
// -> a
// -> a.<ext>
// -> a/index.<ext>
// check if the directory is a package.json dir
const packageMainCache = Object.create(null);
function readPackage(requestPath) {
const entry = packageMainCache[requestPath];
if (entry)
return entry;
const jsonPath = path.resolve(requestPath, 'package.json');
const json = internalModuleReadFile(path._makeLong(jsonPath));
if (json === undefined) {
return false;
}
try {
var pkg = packageMainCache[requestPath] = JSON.parse(json).main;
} catch (e) {
e.path = jsonPath;
e.message = 'Error parsing ' + jsonPath + ': ' + e.message;
throw e;
}
return pkg;
}
function tryPackage(requestPath, exts, isMain) {
var pkg = readPackage(requestPath);
if (!pkg) return false;
var filename = path.resolve(requestPath, pkg);
return tryFile(filename, isMain) ||
tryExtensions(filename, exts, isMain) ||
tryExtensions(path.resolve(filename, 'index'), exts, isMain);
}
// In order to minimize unnecessary lstat() calls,
// this cache is a list of known-real paths.
// Set to an empty Map to reset.
const realpathCache = new Map();
// check if the file exists and is not a directory
// if using --preserve-symlinks and isMain is false,
// keep symlinks intact, otherwise resolve to the
// absolute realpath.
function tryFile(requestPath, isMain) {
const rc = stat(requestPath);
if (preserveSymlinks && !isMain) {
return rc === 0 && path.resolve(requestPath);
}
return rc === 0 && toRealPath(requestPath);
}
function toRealPath(requestPath) {
return fs.realpathSync(requestPath, {
[internalFS.realpathCacheKey]: realpathCache
});
}
// given a path check a the file exists with any of the set extensions
function tryExtensions(p, exts, isMain) {
for (var i = 0; i < exts.length; i++) {
const filename = tryFile(p + exts[i], isMain);
if (filename) {
return filename;
}
}
return false;
}
var warned = false;
Module._findPath = function(request, paths, isMain) {
if (path.isAbsolute(request)) {
paths = [''];
} else if (!paths || paths.length === 0) {
return false;
}
var cacheKey = request + '\x00' +
(paths.length === 1 ? paths[0] : paths.join('\x00'));
var entry = Module._pathCache[cacheKey];
if (entry)
return entry;
var exts;
var trailingSlash = request.length > 0 &&
request.charCodeAt(request.length - 1) === 47/*/*/;
// For each path
for (var i = 0; i < paths.length; i++) {
// Don't search further if path doesn't exist
const curPath = paths[i];
if (curPath && stat(curPath) < 1) continue;
var basePath = path.resolve(curPath, request);
var filename;
var rc = stat(basePath);
if (!trailingSlash) {
if (rc === 0) { // File.
if (preserveSymlinks && !isMain) {
filename = path.resolve(basePath);
} else {
filename = toRealPath(basePath);
}
} else if (rc === 1) { // Directory.
if (exts === undefined)
exts = Object.keys(Module._extensions);
filename = tryPackage(basePath, exts, isMain);
}
if (!filename) {
// try it with each of the extensions
if (exts === undefined)
exts = Object.keys(Module._extensions);
filename = tryExtensions(basePath, exts, isMain);
}
}
if (!filename && rc === 1) { // Directory.
if (exts === undefined)
exts = Object.keys(Module._extensions);
filename = tryPackage(basePath, exts, isMain);
}
if (!filename && rc === 1) { // Directory.
// try it with each of the extensions at "index"
if (exts === undefined)
exts = Object.keys(Module._extensions);
filename = tryExtensions(path.resolve(basePath, 'index'), exts, isMain);
}
if (filename) {
// Warn once if '.' resolved outside the module dir
if (request === '.' && i > 0) {
if (!warned) {
warned = true;
process.emitWarning(
'warning: require(\'.\') resolved outside the package ' +
'directory. This functionality is deprecated and will be removed ' +
'soon.',
'DeprecationWarning', 'DEP0019');
}
}
Module._pathCache[cacheKey] = filename;
return filename;
}
}
return false;
};
// 'node_modules' character codes reversed
var nmChars = [ 115, 101, 108, 117, 100, 111, 109, 95, 101, 100, 111, 110 ];
var nmLen = nmChars.length;
if (process.platform === 'win32') {
// 'from' is the __dirname of the module.
Module._nodeModulePaths = function(from) {
// guarantee that 'from' is absolute.
from = path.resolve(from);
// note: this approach *only* works when the path is guaranteed
// to be absolute. Doing a fully-edge-case-correct path.split
// that works on both Windows and Posix is non-trivial.
// return root node_modules when path is 'D:\\'.
// path.resolve will make sure from.length >=3 in Windows.
if (from.charCodeAt(from.length - 1) === 92/*\*/ &&
from.charCodeAt(from.length - 2) === 58/*:*/)
return [from + 'node_modules'];
const paths = [];
var p = 0;
var last = from.length;
for (var i = from.length - 1; i >= 0; --i) {
const code = from.charCodeAt(i);
// The path segment separator check ('\' and '/') was used to get
// node_modules path for every path segment.
// Use colon as an extra condition since we can get node_modules
// path for drive root like 'C:\node_modules' and don't need to
// parse drive name.
if (code === 92/*\*/ || code === 47/*/*/ || code === 58/*:*/) {
if (p !== nmLen)
paths.push(from.slice(0, last) + '\\node_modules');
last = i;
p = 0;
} else if (p !== -1) {
if (nmChars[p] === code) {
++p;
} else {
p = -1;
}
}
}
return paths;
};
} else { // posix
// 'from' is the __dirname of the module.
Module._nodeModulePaths = function(from) {
// guarantee that 'from' is absolute.
from = path.resolve(from);
// Return early not only to avoid unnecessary work, but to *avoid* returning
// an array of two items for a root: [ '//node_modules', '/node_modules' ]
if (from === '/')
return ['/node_modules'];
// note: this approach *only* works when the path is guaranteed
// to be absolute. Doing a fully-edge-case-correct path.split
// that works on both Windows and Posix is non-trivial.
const paths = [];
var p = 0;
var last = from.length;
for (var i = from.length - 1; i >= 0; --i) {
const code = from.charCodeAt(i);
if (code === 47/*/*/) {
if (p !== nmLen)
paths.push(from.slice(0, last) + '/node_modules');
last = i;
p = 0;
} else if (p !== -1) {
if (nmChars[p] === code) {
++p;
} else {
p = -1;
}
}
}
// Append /node_modules to handle root paths.
paths.push('/node_modules');
return paths;
};
}
// 'index.' character codes
var indexChars = [ 105, 110, 100, 101, 120, 46 ];
var indexLen = indexChars.length;
Module._resolveLookupPaths = function(request, parent, newReturn) {
if (NativeModule.nonInternalExists(request)) {
debug('looking for %j in []', request);
return (newReturn ? null : [request, []]);
}
// Check for relative path
if (request.length < 2 ||
request.charCodeAt(0) !== 46/*.*/ ||
(request.charCodeAt(1) !== 46/*.*/ &&
request.charCodeAt(1) !== 47/*/*/)) {
var paths = modulePaths;
if (parent) {
if (!parent.paths)
paths = parent.paths = [];
else
paths = parent.paths.concat(paths);
}
// Maintain backwards compat with certain broken uses of require('.')
// by putting the module's directory in front of the lookup paths.
if (request === '.') {
if (parent && parent.filename) {
paths.unshift(path.dirname(parent.filename));
} else {
paths.unshift(path.resolve(request));
}
}
debug('looking for %j in %j', request, paths);
return (newReturn ? (paths.length > 0 ? paths : null) : [request, paths]);
}
// with --eval, parent.id is not set and parent.filename is null
if (!parent || !parent.id || !parent.filename) {
// make require('./path/to/foo') work - normally the path is taken
// from realpath(__filename) but with eval there is no filename
var mainPaths = ['.'].concat(Module._nodeModulePaths('.'), modulePaths);
debug('looking for %j in %j', request, mainPaths);
return (newReturn ? mainPaths : [request, mainPaths]);
}
// Is the parent an index module?
// We can assume the parent has a valid extension,
// as it already has been accepted as a module.
const base = path.basename(parent.filename);
var parentIdPath;
if (base.length > indexLen) {
var i = 0;
for (; i < indexLen; ++i) {
if (indexChars[i] !== base.charCodeAt(i))
break;
}
if (i === indexLen) {
// We matched 'index.', let's validate the rest
for (; i < base.length; ++i) {
const code = base.charCodeAt(i);
if (code !== 95/*_*/ &&
(code < 48/*0*/ || code > 57/*9*/) &&
(code < 65/*A*/ || code > 90/*Z*/) &&
(code < 97/*a*/ || code > 122/*z*/))
break;
}
if (i === base.length) {
// Is an index module
parentIdPath = parent.id;
} else {
// Not an index module
parentIdPath = path.dirname(parent.id);
}
} else {
// Not an index module
parentIdPath = path.dirname(parent.id);
}
} else {
// Not an index module
parentIdPath = path.dirname(parent.id);
}
var id = path.resolve(parentIdPath, request);
// make sure require('./path') and require('path') get distinct ids, even
// when called from the toplevel js file
if (parentIdPath === '.' && id.indexOf('/') === -1) {
id = './' + id;
}
debug('RELATIVE: requested: %s set ID to: %s from %s', request, id,
parent.id);
var parentDir = [path.dirname(parent.filename)];
debug('looking for %j in %j', id, parentDir);
return (newReturn ? parentDir : [id, parentDir]);
};
// Check the cache for the requested file.
// 1. If a module already exists in the cache: return its exports object.
// 2. If the module is native: call `NativeModule.require()` with the
// filename and return the result.
// 3. Otherwise, create a new module for the file and save it to the cache.
// Then have it load the file contents before returning its exports
// object.
Module._load = function(request, parent, isMain) {
if (parent) {
debug('Module._load REQUEST %s parent: %s', request, parent.id);
}
var filename = Module._resolveFilename(request, parent, isMain);
var cachedModule = Module._cache[filename];
if (cachedModule) {
return cachedModule.exports;
}
if (NativeModule.nonInternalExists(filename)) {
debug('load native module %s', request);
return NativeModule.require(filename);
}
var module = new Module(filename, parent);
if (isMain) {
process.mainModule = module;
module.id = '.';
}
Module._cache[filename] = module;
tryModuleLoad(module, filename);
return module.exports;
};
function tryModuleLoad(module, filename) {
var threw = true;
try {
module.load(filename);
threw = false;
} finally {
if (threw) {
delete Module._cache[filename];
}
}
}
Module._resolveFilename = function(request, parent, isMain) {
if (NativeModule.nonInternalExists(request)) {
return request;
}
var paths = Module._resolveLookupPaths(request, parent, true);
// look up the filename first, since that's the cache key.
var filename = Module._findPath(request, paths, isMain);
if (!filename) {
var err = new Error(`Cannot find module '${request}'`);
err.code = 'MODULE_NOT_FOUND';
throw err;
}
return filename;
};
// Given a file name, pass it to the proper extension handler.
Module.prototype.load = function(filename) {
debug('load %j for module %j', filename, this.id);
assert(!this.loaded);
this.filename = filename;
this.paths = Module._nodeModulePaths(path.dirname(filename));
var extension = path.extname(filename) || '.js';
if (!Module._extensions[extension]) extension = '.js';
Module._extensions[extension](this, filename);
this.loaded = true;
};
// Loads a module at the given file path. Returns that module's
// `exports` property.
Module.prototype.require = function(path) {
assert(path, 'missing path');
assert(typeof path === 'string', 'path must be a string');
return Module._load(path, this, /* isMain */ false);
};
// Resolved path to process.argv[1] will be lazily placed here
// (needed for setting breakpoint when called with --inspect-brk)
var resolvedArgv;
// Run the file contents in the correct scope or sandbox. Expose
// the correct helper variables (require, module, exports) to
// the file.
// Returns exception, if any.
Module.prototype._compile = function(content, filename) {
content = internalModule.stripShebang(content);
// create wrapper function
var wrapper = Module.wrap(content);
var compiledWrapper = vm.runInThisContext(wrapper, {
filename: filename,
lineOffset: 0,
displayErrors: true
});
var inspectorWrapper = null;
if (process._debugWaitConnect && process._eval == null) {
if (!resolvedArgv) {
// we enter the repl if we're not given a filename argument.
if (process.argv[1]) {
resolvedArgv = Module._resolveFilename(process.argv[1], null, false);
} else {
resolvedArgv = 'repl';
}
}
// Set breakpoint on module start
if (filename === resolvedArgv) {
delete process._debugWaitConnect;
inspectorWrapper = process.binding('inspector').callAndPauseOnStart;
if (!inspectorWrapper) {
const Debug = vm.runInDebugContext('Debug');
Debug.setBreakPoint(compiledWrapper, 0, 0);
}
}
}
var dirname = path.dirname(filename);
var require = internalModule.makeRequireFunction(this);
var depth = internalModule.requireDepth;
if (depth === 0) stat.cache = new Map();
var result;
if (inspectorWrapper) {
result = inspectorWrapper(compiledWrapper, this.exports, this.exports,
require, this, filename, dirname);
} else {
result = compiledWrapper.call(this.exports, this.exports, require, this,
filename, dirname);
}
if (depth === 0) stat.cache = null;
return result;
};
// Native extension for .js
Module._extensions['.js'] = function(module, filename) {
var content = fs.readFileSync(filename, 'utf8');
module._compile(internalModule.stripBOM(content), filename);
};
// Native extension for .json
Module._extensions['.json'] = function(module, filename) {
var content = fs.readFileSync(filename, 'utf8');
try {
module.exports = JSON.parse(internalModule.stripBOM(content));
} catch (err) {
err.message = filename + ': ' + err.message;
throw err;
}
};
//Native extension for .node
Module._extensions['.node'] = function(module, filename) {
return process.dlopen(module, path._makeLong(filename));
};
// bootstrap main module.
Module.runMain = function() {
// Load the main module--the command line argument.
Module._load(process.argv[1], null, true);
// Handle any nextTicks added in the first tick of the program
process._tickCallback();
};
Module._initPaths = function() {
const isWindows = process.platform === 'win32';
var homeDir;
if (isWindows) {
homeDir = process.env.USERPROFILE;
} else {
homeDir = process.env.HOME;
}
// $PREFIX/lib/node, where $PREFIX is the root of the Node.js installation.
var prefixDir;
// process.execPath is $PREFIX/bin/node except on Windows where it is
// $PREFIX\node.exe.
if (isWindows) {
prefixDir = path.resolve(process.execPath, '..');
} else {
prefixDir = path.resolve(process.execPath, '..', '..');
}
var paths = [path.resolve(prefixDir, 'lib', 'node')];
if (homeDir) {
paths.unshift(path.resolve(homeDir, '.node_libraries'));
paths.unshift(path.resolve(homeDir, '.node_modules'));
}
var nodePath = process.env['NODE_PATH'];
if (nodePath) {
paths = nodePath.split(path.delimiter).filter(function(path) {
return !!path;
}).concat(paths);
}
modulePaths = paths;
// clone as a shallow copy, for introspection.
Module.globalPaths = modulePaths.slice(0);
};
Module._preloadModules = function(requests) {
if (!Array.isArray(requests))
return;
// Preloaded modules have a dummy parent module which is deemed to exist
// in the current working directory. This seeds the search path for
// preloaded modules.
var parent = new Module('internal/preload', null);
try {
parent.paths = Module._nodeModulePaths(process.cwd());
} catch (e) {
if (e.code !== 'ENOENT') {
throw e;
}
}
for (var n = 0; n < requests.length; n++)
parent.require(requests[n]);
};
Module._initPaths();
// backwards compatibility
Module.Module = Module;