get/js/get-nodejs.js

get-nodejs.js revision b2d7247c96abef31a62c61f5ba4432b2293402e7
   /**
   * NodeJS specific Get module used to load remote resources. It contains the same signature as the default Get module so there is no code change needed.
   * @module get-nodejs
   * @class GetNodeJS
   */

   var path = require('path'),
       vm = require('vm'),
       fs = require('fs'),
       request = require('request');


   Y.Get = function() {
   };

   //Setup the default config base path
   Y.config.base = path.join(__dirname, '../');

   YUI.require = require;
   YUI.process = process;

   /**
   * Escape the path for Windows, they need to be double encoded when used as `__dirname` or `__filename`
   * @method escapeWinPath
   * @protected
   * @param {String} p The path to modify
   * @return {String} The encoded path
   */
   var escapeWinPath = function(p) {
       return p.replace(/\\/g, '\\\\');
   };

   /**
   * Takes the raw JS files and wraps them to be executed in the YUI context so they can be loaded
   * into the YUI object
   * @method _exec
   * @private
   * @param {String} data The JS to execute
   * @param {String} url The path to the file that was parsed
   * @param {Callback} cb The callback to execute when this is completed
   * @param {Error} cb.err=null Error object
   * @param {String} cb.url The URL that was just parsed
   */

   Y.Get._exec = function(data, url, cb) {
       var dirName = escapeWinPath(path.dirname(url));
       var fileName = escapeWinPath(url);

       if (dirName.match(/^https?:\/\//)) {
           dirName = '.';
           fileName = 'remoteResource';
       }

       var mod = "(function(YUI) { var __dirname = '" + dirName + "'; "+
           "var __filename = '" + fileName + "'; " +
           "var process = YUI.process;" +
           "var require = function(file) {" +
           " if (file.indexOf('./') === 0) {" +
           "   file = __dirname + file.replace('./', '/'); }" +
           " return YUI.require(file); }; " +
           data + " ;return YUI; })";

       //var mod = "(function(YUI) { " + data + ";return YUI; })";
       var script = vm.createScript(mod, url);
       var fn = script.runInThisContext(mod);
       YUI = fn(YUI);
       cb(null, url);
   };

   /**
   * Fetches the content from a remote URL or a file from disc and passes the content
   * off to `_exec` for parsing
   * @method _include
   * @private
   * @param {String} url The URL/File path to fetch the content from
   * @param {Callback} cb The callback to fire once the content has been executed via `_exec`
   */
   Y.Get._include = function(url, cb) {
       if (url.match(/^https?:\/\//)) {
           request(url, function (err, response, body) {
               if (err) {
                   Y.log(err, 'error', 'get');
                   cb(err, url);
               } else {
                   Y.Get._exec(body, url, cb);
               }
           });
       } else {
           if (Y.config.useSync) {
               //Needs to be in useSync
               if (path.existsSync(url)) {
                   var mod = fs.readFileSync(url,'utf8');
                   Y.Get._exec(mod, url, cb);
               } else {
                   cb('Path does not exist: ' + url, url);
               }
           } else {
               fs.readFile(url, 'utf8', function(err, mod) {
                   if (err) {
                       cb(err, url);
                   } else {
                       Y.Get._exec(mod, url, cb);
                   }
               });
           }
       }

   };


   var end = function(cb, msg, result) {
       //Y.log('Get end: ' + cb.onEnd);
       if (Y.Lang.isFunction(cb.onEnd)) {
           cb.onEnd.call(Y, msg, result);
       }
   }, pass = function(cb) {
       //Y.log('Get pass: ' + cb.onSuccess);
       if (Y.Lang.isFunction(cb.onSuccess)) {
           cb.onSuccess.call(Y, cb);
       }
       end(cb, 'success', 'success');
   }, fail = function(cb, er) {
       //Y.log('Get fail: ' + er);
       if (Y.Lang.isFunction(cb.onFailure)) {
           cb.onFailure.call(Y, er, cb);
       }
       end(cb, er, 'fail');
   };


   /**
   * Override for Get.script for loading local or remote YUI modules.
   * @method js
   * @param {Array|String} s The URL's to load into this context
   * @param {Object} options Transaction options
   */
   Y.Get.js = function(s, options) {
       var A = Y.Array,
           self = this,
           urls = A(s), url, i, l = urls.length, c= 0,
           check = function() {
               if (c === l) {
                   pass(options);
               }
           };


       for (i=0; i<l; i++) {
           url = urls[i];
           if (Y.Lang.isObject(url)) {
               url = url.url;
           }

           url = url.replace(/'/g, '%27');
           Y.log('URL: ' + url, 'info', 'get');
           Y.Get._include(url, function(err, url) {
               if (!Y.config) {
                   Y.config = {
                       debug: true
                   };
               }
               if (options.onProgress) {
                   options.onProgress.call(options.context || Y, url);
               }
               Y.log('After Load: ' + url, 'info', 'get');
               if (err) {
                   fail(options, err);
                   Y.log('----------------------------------------------------------', 'error', 'get');
                   Y.log(err, 'error', 'get');
                   Y.log('----------------------------------------------------------', 'error', 'get');
               } else {
                   c++;
                   check();
               }
           });
       }
   };

   /**
   * Alias for `Y.Get.js`
   * @method script
   */
   Y.Get.script = Y.Get.js;

   //Place holder for SS Dom access
   Y.Get.css = function(s, cb) {
       Y.log('Y.Get.css is not supported, just reporting that it has loaded but not fetching.', 'warn', 'get');
       pass(cb);
   };