1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 /** 6 * @fileoverview Implements a shim so that the CFInstall scripts can be compiled 7 * with or without Closure. In particular, chromeframe.js is used by the stub, 8 * the implementation, and the download site, so we need to provide an 9 * implementation of goog.provide. 10 **/ 11 12 var goog = {}; 13 goog.global = this; 14 15 /** 16 * From closure/base.js:goog.exportPath_ . 17 * @param {string} name 18 * @param {Object=} opt_object 19 */ 20 goog.provide = function(name, opt_object) { 21 var parts = name.split('.'); 22 var cur = goog.global; 23 24 // Internet Explorer exhibits strange behavior when throwing errors from 25 // methods externed in this manner. See the testExportSymbolExceptions in 26 // base_test.html for an example. 27 if (!(parts[0] in cur) && cur.execScript) 28 cur.execScript('var ' + parts[0]); 29 30 // Certain browsers cannot parse code in the form for((a in b); c;); 31 // This pattern is produced by the JSCompiler when it collapses the 32 // statement above into the conditional loop below. To prevent this from 33 // happening, use a for-loop and reserve the init logic as below. 34 35 // Parentheses added to eliminate strict JS warning in Firefox. 36 for (var part; parts.length && (part = parts.shift());) { 37 if (!parts.length && opt_object !== undefined) { 38 // last part and we have an object; use it 39 cur[part] = opt_object; 40 } else if (cur[part]) { 41 cur = cur[part]; 42 } else { 43 cur = cur[part] = {}; 44 } 45 } 46 }; 47 48 // The following line causes the closureBuilder script to recognize this as 49 // base.js . 50 goog.provide('goog'); 51 52 /** 53 * From closure/base.js:goog.exportPath_ . 54 * @param {string} name 55 * @param {Object=} opt_object 56 */ 57 goog.exportSymbol = goog.provide; 58 59 /** 60 * NO-OP 61 * @param {string} name 62 */ 63 goog.require = function(name) {}; 64 65 /** 66 * A simple form that supports only bound 'this', not arguments. 67 * @param {Function} fn A function to partially apply. 68 * @param {Object|undefined} selfObj Specifies the object which |this| should 69 * point to when the function is run. 70 * @return {!Function} A partially-applied form of the function bind() was 71 * invoked as a method of. 72 */ 73 goog.bind = function(fn, selfObj) { 74 return function() { 75 return fn.apply(selfObj, arguments); 76 }; 77 }; 78
