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module.js
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module.js
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/**********************************************************************/
// Module
// Set the environ variable NODE_MODULE_CONTEXT=1 to make node load all
// modules in thier own context.
var contextLoad = false;
if (parseInt(process.env["NODE_MODULE_CONTEXTS"]) > 0) contextLoad = true;
var Script;
var internalModuleCache = {};
var extensionCache = {};
function Module (id, parent) {
this.id = id;
this.exports = {};
this.parent = parent;
if (parent) {
this.moduleCache = parent.moduleCache;
} else {
this.moduleCache = {};
}
this.filename = null;
this.loaded = false;
this.exited = false;
this.children = [];
};
function createInternalModule (id, constructor) {
var m = new Module(id);
constructor(m.exports);
m.loaded = true;
internalModuleCache[id] = m;
return m;
};
// This contains the source code for the files in lib/
// Like, natives.fs is the contents of lib/fs.js
var natives = process.binding('natives');
function loadNative (id) {
var m = new Module(id);
internalModuleCache[id] = m;
var e = m._compile(natives[id], id);
if (e) throw e;
m.loaded = true;
return m;
}
exports.requireNative = requireNative;
function requireNative (id) {
if (internalModuleCache[id]) return internalModuleCache[id].exports;
if (!natives[id]) throw new Error('No such native module ' + id);
return loadNative(id).exports;
}
// Event
var eventsFn = process.compile("(function (exports) {" + natives.events + "\n})",
"events");
var eventsModule = createInternalModule('events', eventsFn);
var events = eventsModule.exports;
// Modules
var debugLevel = parseInt(process.env["NODE_DEBUG"], 16);
function debug (x) {
if (debugLevel & 1) {
process.binding('stdio').writeError(x + "\n");
}
}
var pathFn = process.compile("(function (exports) {" + natives.path + "\n})",
"path");
var pathModule = createInternalModule('path', pathFn);
var path = pathModule.exports;
function existsSync (path) {
try {
process.binding('fs').stat(path);
return true;
} catch (e) {
return false;
}
}
var modulePaths = [path.join(process.execPath, "..", "..", "lib", "node")];
if (process.env["HOME"]) {
modulePaths.unshift(path.join(process.env["HOME"], ".node_libraries"));
}
if (process.env["NODE_PATH"]) {
modulePaths = process.env["NODE_PATH"].split(":").concat(modulePaths);
}
/* Sync unless callback given */
function findModulePath (id, dirs, callback) {
process.assert(dirs.constructor == Array);
if (/^https?:\/\//.exec(id)) {
if (callback) {
callback(id);
} else {
throw new Error("Sync http require not allowed.");
}
return;
}
if (/\.(js|node)$/.exec(id)) {
throw new Error("No longer accepting filename extension in module names");
}
if (dirs.length == 0) {
if (callback) {
callback();
} else {
return; // sync returns null
}
}
var dir = dirs[0];
var rest = dirs.slice(1, dirs.length);
if (id.charAt(0) == '/') {
dir = '';
rest = [];
}
var locations = [
path.join(dir, id + ".js"),
path.join(dir, id + ".node"),
path.join(dir, id, "index.js"),
path.join(dir, id, "index.node"),
path.join(dir, id)
];
var ext;
var extensions = Object.keys(extensionCache);
for (var i = 0, l = extensions.length; i < l; i++) {
var ext = extensions[i];
locations.push(path.join(dir, id + ext));
locations.push(path.join(dir, id, 'index' + ext));
}
function searchLocations () {
var location = locations.shift();
if (!location) {
return findModulePath(id, rest, callback);
}
// if async
if (callback) {
path.exists(location, function (found) {
if (found) {
callback(location);
} else {
return searchLocations();
}
});
// if sync
} else {
if (existsSync(location)) {
return location;
} else {
return searchLocations();
}
}
}
return searchLocations();
}
// sync - no i/o performed
function resolveModulePath(request, parent) {
var id, paths;
if (request.charAt(0) == "." && (request.charAt(1) == "/" || request.charAt(1) == ".")) {
// Relative request
var exts = ['js', 'node'], ext;
var extensions = Object.keys(extensionCache);
for (var i = 0, l = extensions.length; i < l; i++) {
var ext = extensions[i];
exts.push(ext.slice(1));
}
var parentIdPath = path.dirname(parent.id +
(path.basename(parent.filename).match(new RegExp('^index\\.(' + exts.join('|') + ')$')) ? "/." : ""));
id = path.join(parentIdPath, request);
// make sure require('./path') and require('path') get distinct ids, even
// when called from the toplevel js file
if (parentIdPath == '.' && ! id.match(new RegExp('/'))) {
id = './' + id;
}
debug("RELATIVE: requested:" + request + " set ID to: "+id+" from "+parent.id);
paths = [path.dirname(parent.filename)];
} else {
id = request;
// debug("ABSOLUTE: id="+id);
paths = modulePaths;
}
return [id, paths];
}
function loadModule (request, parent, callback) {
var resolvedModule = resolveModulePath(request, parent),
id = resolvedModule[0],
paths = resolvedModule[1];
debug("loadModule REQUEST " + (request) + " parent: " + parent.id);
// native modules always take precedence.
var cachedNative = internalModuleCache[id];
if (cachedNative) {
return callback ? callback(null, cachedNative.exports) : cachedNative.exports;
}
if (natives[id]) {
debug('load native module ' + id);
var nativeMod = loadNative(id);
return callback ? callback(null, nativeMod.exports) : nativeMod.exports;
}
// look up the filename first, since that's the cache key.
debug("looking for " + JSON.stringify(id) + " in " + JSON.stringify(paths));
if (!callback) {
// sync
var filename = findModulePath(request, paths);
if (!filename) {
throw new Error("Cannot find module '" + request + "'");
}
var cachedModule = parent.moduleCache[filename];
if (cachedModule) return cachedModule.exports;
var module = new Module(id, parent);
module.moduleCache[filename] = module;
module.loadSync(filename);
return module.exports;
}
// async
findModulePath(request, paths, function (filename) {
if (!filename) {
var err = new Error("Cannot find module '" + request + "'");
return callback(err);
}
var cachedModule = parent.moduleCache[filename];
if (cachedModule) return callback(null, cachedModule.exports);
var module = new Module(id, parent);
module.moduleCache[filename] = module;
module.load(filename, callback);
});
};
// This function allows the user to register file extensions to custom
// Javascript 'compilers'. It accepts 2 arguments, where ext is a file
// extension as a string. E.g. '.coffee' for coffee-script files. compiler
// is the second argument, which is a function that gets called when the
// specified file extension is found. The compiler is passed a single
// argument, which is, the file contents, which need to be compiled.
//
// The function needs to return the compiled source, or an non-string
// variable that will get attached directly to the module exports. Example:
//
// require.registerExtension('.coffee', function(content) {
// return doCompileMagic(content);
// });
function registerExtension(ext, compiler) {
if ('string' !== typeof ext && false === /\.\w+$/.test(ext)) {
throw new Error('require.registerExtension: First argument not a valid extension string.');
}
if ('function' !== typeof compiler) {
throw new Error('require.registerExtension: Second argument not a valid compiler function.');
}
extensionCache[ext] = compiler;
}
Module.prototype.loadSync = function (filename) {
debug("loadSync " + JSON.stringify(filename) + " for module " + JSON.stringify(this.id));
process.assert(!this.loaded);
this.filename = filename;
if (filename.match(/\.node$/)) {
this._loadObjectSync(filename);
} else {
this._loadScriptSync(filename);
}
};
Module.prototype.load = function (filename, callback) {
debug("load " + JSON.stringify(filename) + " for module " + JSON.stringify(this.id));
process.assert(!this.loaded);
this.filename = filename;
if (filename.match(/\.node$/)) {
this._loadObject(filename, callback);
} else {
this._loadScript(filename, callback);
}
};
Module.prototype._loadObjectSync = function (filename) {
this.loaded = true;
process.dlopen(filename, this.exports);
};
Module.prototype._loadObject = function (filename, callback) {
var self = this;
// XXX Not yet supporting loading from HTTP. would need to download the
// file, store it to tmp then run dlopen on it.
self.loaded = true;
process.dlopen(filename, self.exports); // FIXME synchronus
if (callback) callback(null, self.exports);
};
function cat (id, callback) {
if (id.match(/^http:\/\//)) {
loadModule('http', process.mainModule, function (err, http) {
if (err) {
if (callback) callback(err);
} else {
http.cat(id, callback);
}
});
} else {
requireNative('fs').readFile(id, 'utf8', callback);
}
}
// Returns exception if any
Module.prototype._compile = function (content, filename) {
var self = this;
// remove shebang
content = content.replace(/^\#\!.*/, '');
// Compile content if needed
var ext = path.extname(filename);
if (extensionCache[ext]) {
content = extensionCache[ext](content);
}
function requireAsync (url, cb) {
loadModule(url, self, cb);
}
function require (path) {
return loadModule(path, self);
}
require.paths = modulePaths;
require.async = requireAsync;
require.main = process.mainModule;
require.registerExtension = registerExtension;
var dirname = path.dirname(filename);
if (contextLoad) {
if (!Script) Script = Script = process.binding('evals').Script;
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.root = global;
Script.runInNewContext(content, sandbox, filename);
} else {
debug('load root module');
// root module
global.require = require;
global.exports = self.exports;
global.__filename = filename;
global.__dirname = dirname;
global.module = self;
global.root = global;
Script.runInThisContext(content, filename);
}
} else {
if ('string' === typeof content) {
// create wrapper function
var wrapper = "(function (exports, require, module, __filename, __dirname) { "
+ content
+ "\n});";
var compiledWrapper = process.compile(wrapper, filename);
if (filename === process.argv[1] && global.v8debug) {
global.v8debug.Debug.setBreakPoint(compiledWrapper, 0, 0);
}
compiledWrapper.apply(self.exports, [self.exports, require, self, filename, dirname]);
} else {
self.exports = content;
}
}
};
Module.prototype._loadScriptSync = function (filename) {
var content = requireNative('fs').readFileSync(filename, 'utf8');
this._compile(content, filename);
this.loaded = true;
};
Module.prototype._loadScript = function (filename, callback) {
var self = this;
cat(filename, function (err, content) {
debug('cat done');
if (err) {
if (callback) callback(err);
} else {
try {
self._compile(content, filename);
} catch (err) {
if (callback) callback(err);
return;
}
self._waitChildrenLoad(function () {
self.loaded = true;
if (self.onload) self.onload();
if (callback) callback(null, self.exports);
});
}
});
};
Module.prototype._waitChildrenLoad = function (callback) {
var nloaded = 0;
var children = this.children;
for (var i = 0; i < children.length; i++) {
var child = children[i];
if (child.loaded) {
nloaded++;
} else {
child.onload = function () {
child.onload = null;
nloaded++;
if (children.length == nloaded && callback) callback();
};
}
}
if (children.length == nloaded && callback) callback();
};
// bootstrap main module.
exports.runMain = function () {
// Load the main module--the command line argument.
process.mainModule = new Module(".");
process.mainModule.loadSync(process.argv[1]);
}