node/lib/module.js at master · r2d2coder/node · GitHub

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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.

var NativeModule = require('native_module');

var Script = process.binding('evals').Script;

var runInThisContext = Script.runInThisContext;

var runInNewContext = Script.runInNewContext;

var assert = require('assert').ok;

function Module(id, parent) {

this.id = id;

this.exports = {};

this.parent = parent;

this.filename = null;

this.loaded = false;

this.exited = false;

this.children = [];

}

module.exports = Module;

// Set the environ variable NODE_MODULE_CONTEXTS=1 to make node load all

// modules in thier own context.

Module._contextLoad = (+process.env['NODE_MODULE_CONTEXTS'] > 0);

Module._cache = {};

Module._pathCache = {};

Module._extensions = {};

Module._paths = [];

Module.wrapper = NativeModule.wrapper;

Module.wrap = NativeModule.wrap;

var path = NativeModule.require('path');

Module._debug = function() {};

if (process.env.NODE_DEBUG && /module/.test(process.env.NODE_DEBUG)) {

Module._debug = function(x) {

console.error(x);

};

}

// We use this alias for the preprocessor that filters it out

var 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>

function statPath(path) {

var fs = NativeModule.require('fs');

try {

return fs.statSync(path);

} catch (ex) {}

return false;

}

// check if the directory is a package.json dir

var packageCache = {};

function readPackage(requestPath) {

if (packageCache.hasOwnProperty(requestPath)) {

return packageCache[requestPath];

}

var fs = NativeModule.require('fs');

try {

var jsonPath = path.resolve(requestPath, 'package.json');

var json = fs.readFileSync(jsonPath, 'utf8');

var pkg = packageCache[requestPath] = JSON.parse(json);

return pkg;

} catch (e) {}

return false;

}

function tryPackage(requestPath, exts) {

var pkg = readPackage(requestPath);

if (!pkg || !pkg.main) return false;

var filename = path.resolve(requestPath, pkg.main);

return tryFile(filename) || tryExtensions(filename, exts) ||

tryExtensions(path.resolve(filename, 'index'), exts);

}

// In order to minimize unnecessary lstat() calls,

// this cache is a list of known-real paths.

// Set to an empty object to reset.

Module._realpathCache = {}

// check if the file exists and is not a directory

function tryFile(requestPath) {

var fs = NativeModule.require('fs');

var stats = statPath(requestPath);

if (stats && !stats.isDirectory()) {

return fs.realpathSync(requestPath, Module._realpathCache);

}

return false;

}

// given a path check a the file exists with any of the set extensions

function tryExtensions(p, exts) {

for (var i = 0, EL = exts.length; i < EL; i++) {

var filename = tryFile(p + exts[i]);

if (filename) {

return filename;

}

return false;

}

Module._findPath = function(request, paths) {

var fs = NativeModule.require('fs');

var exts = Object.keys(Module._extensions);

if (request.charAt(0) === '/') {

paths = [''];

}

var trailingSlash = (request.slice(-1) === '/');

var cacheKey = JSON.stringify({request: request, paths: paths});

if (Module._pathCache[cacheKey]) {

return Module._pathCache[cacheKey];

}

// For each path

for (var i = 0, PL = paths.length; i < PL; i++) {

var basePath = path.resolve(paths[i], request);

var filename;

if (!trailingSlash) {

// try to join the request to the path

filename = tryFile(basePath);

if (!filename && !trailingSlash) {

// try it with each of the extensions

filename = tryExtensions(basePath, exts);

}

if (!filename) {

filename = tryPackage(basePath, exts);

}

if (!filename) {

// try it with each of the extensions at "index"

filename = tryExtensions(path.resolve(basePath, 'index'), exts);

}

if (filename) {

Module._pathCache[cacheKey] = filename;

return filename;

}

return false;

};

// '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.

var splitRe = process.platform === 'win32' ? /[\/\\]/ : /\//;

// yes, '/' works on both, but let's be a little canonical.

var joiner = process.platform === 'win32' ? '\\' : '/';

var paths = [];

var parts = from.split(splitRe);

var root = parts.indexOf('node_modules') - 1;

if (root < 0) root = 0;

var tip = parts.length - 1;

for (var tip = parts.length - 1; tip >= root; tip --) {

// don't search in .../node_modules/node_modules

if (parts[tip] === 'node_modules') continue;

var dir = parts.slice(0, tip + 1).concat('node_modules').join(joiner);

paths.push(dir);

}

return paths;

}

Module._resolveLookupPaths = function(request, parent) {

if (NativeModule.exists(request)) {

return [request, []];

}

var start = request.substring(0, 2);

if (start !== './' && start !== '..') {

var paths = Module._paths;

if (parent) {

if (!parent.paths) parent.paths = [];

paths = parent.paths.concat(paths);

}

return [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._paths);

mainPaths = Module._nodeModulePaths('.').concat(mainPaths);

return [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.

var isIndex = /^index\.\w+?$/.test(path.basename(parent.filename));

var parentIdPath = isIndex ? parent.id : 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:' + request +

' set ID to: ' + id + ' from ' + parent.id);

return [id, [path.dirname(parent.filename)]];

};

Module._load = function(request, parent, isMain) {

if (parent) {

debug('Module._load REQUEST ' + (request) + ' parent: ' + parent.id);

}

var resolved = Module._resolveFilename(request, parent);

var id = resolved[0];

var filename = resolved[1];

var cachedModule = Module._cache[filename];

if (cachedModule) {

return cachedModule.exports;

}

if (NativeModule.exists(id)) {

// REPL is a special case, because it needs the real require.

if (id == 'repl') {

var replModule = new Module('repl');

replModule._compile(NativeModule.getSource('repl'), 'repl.js');

NativeModule._cache.repl = replModule;

return replModule.exports;

}

debug('load native module ' + request);

return NativeModule.require(id);

}

var module = new Module(id, parent);

if (isMain) {

process.mainModule = module;

module.id = '.';

}

Module._cache[filename] = module;

try {

module.load(filename);

} catch (err) {

delete Module._cache[filename];

throw err;

}

return module.exports;

};

Module._resolveFilename = function(request, parent) {

if (NativeModule.exists(request)) {

return [request, request];

}

var resolvedModule = Module._resolveLookupPaths(request, parent);

var id = resolvedModule[0];

var paths = resolvedModule[1];

// look up the filename first, since that's the cache key.

debug('looking for ' + JSON.stringify(id) +

' in ' + JSON.stringify(paths));

var filename = Module._findPath(request, paths);

if (!filename) {

throw new Error("Cannot find module '" + request + "'");

}

id = filename;

return [id, filename];

};

Module.prototype.load = function(filename) {

debug('load ' + JSON.stringify(filename) +

' for module ' + JSON.stringify(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;

};

// Returns exception if any

Module.prototype._compile = function(content, filename) {

var self = this;

// remove shebang

content = content.replace(/^\#\!.*/, '');

function require(path) {

return Module._load(path, self);

}

require.resolve = function(request) {

return Module._resolveFilename(request, self)[1];

}

require.paths = Module._paths;

require.main = process.mainModule;

// Enable support to add extra extension types

require.extensions = Module._extensions;

require.registerExtension = function() {

throw new Error('require.registerExtension() removed. Use ' +

'require.extensions instead.');

}

require.cache = Module._cache;

var dirname = path.dirname(filename);

if (Module._contextLoad) {

if (self.id !== '.') {

debug('load submodule');

// not root module

var sandbox = {};

for (var k in global) {

sandbox[k] = global[k];

}

sandbox.require = require;

sandbox.exports = self.exports;

sandbox.__filename = filename;

sandbox.__dirname = dirname;

sandbox.module = self;

sandbox.global = sandbox;

sandbox.root = root;

return runInNewContext(content, sandbox, filename, true);

}

debug('load root module');

// root module

global.require = require;

global.exports = self.exports;

global.__filename = filename;

global.__dirname = dirname;

global.module = self;

return runInThisContext(content, filename, true);

}

// create wrapper function

var wrapper = Module.wrap(content);

var compiledWrapper = runInThisContext(wrapper, filename, true);

if (filename === process.argv[1] && global.v8debug) {

global.v8debug.Debug.setBreakPoint(compiledWrapper, 0, 0);

}

var args = [self.exports, require, self, filename, dirname];

return compiledWrapper.apply(self.exports, args);

};

// Native extension for .js

Module._extensions['.js'] = function(module, filename) {

var content = NativeModule.require('fs').readFileSync(filename, 'utf8');

module._compile(content, filename);

};

// Native extension for .node

Module._extensions['.node'] = function(module, filename) {

process.dlopen(filename, module.exports);

};

// bootstrap main module.

Module.runMain = function() {

// Load the main module--the command line argument.

Module._load(process.argv[1], null, true);

};

Module._initPaths = function() {

var paths = [path.resolve(process.execPath, '..', '..', 'lib', 'node')];

if (process.env['HOME']) {

paths.unshift(path.resolve(process.env['HOME'], '.node_libraries'));

paths.unshift(path.resolve(process.env['HOME'], '.node_modules'));

}

if (process.env['NODE_PATH']) {

paths = process.env['NODE_PATH'].split(':').concat(paths);

}

Module._paths = paths;

};

// bootstrap repl

Module.requireRepl = function() {

return Module._load('repl', '.');

};

Module._initPaths();

// backwards compatibility

Module.Module = Module;

node/lib/module.js at master · r2d2coder/node · GitHub

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