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Diffstat (limited to 'assets/viz/1/goog/base.js')
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diff --git a/assets/viz/1/goog/base.js b/assets/viz/1/goog/base.js new file mode 100644 index 0000000..97a9947 --- /dev/null +++ b/assets/viz/1/goog/base.js @@ -0,0 +1,2727 @@ +// Copyright 2006 The Closure Library Authors. All Rights Reserved. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS-IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +/** + * @fileoverview Bootstrap for the Google JS Library (Closure). + * + * In uncompiled mode base.js will write out Closure's deps file, unless the + * global <code>CLOSURE_NO_DEPS</code> is set to true. This allows projects to + * include their own deps file(s) from different locations. + * + * @author arv@google.com (Erik Arvidsson) + * + * @provideGoog + */ + + +/** + * @define {boolean} Overridden to true by the compiler when + * --process_closure_primitives is specified. + */ +var COMPILED = false; + + +/** + * Base namespace for the Closure library. Checks to see goog is already + * defined in the current scope before assigning to prevent clobbering if + * base.js is loaded more than once. + * + * @const + */ +var goog = goog || {}; + + +/** + * Reference to the global context. In most cases this will be 'window'. + */ +goog.global = this; + + +/** + * A hook for overriding the define values in uncompiled mode. + * + * In uncompiled mode, {@code CLOSURE_UNCOMPILED_DEFINES} may be defined before + * loading base.js. If a key is defined in {@code CLOSURE_UNCOMPILED_DEFINES}, + * {@code goog.define} will use the value instead of the default value. This + * allows flags to be overwritten without compilation (this is normally + * accomplished with the compiler's "define" flag). + * + * Example: + * <pre> + * var CLOSURE_UNCOMPILED_DEFINES = {'goog.DEBUG': false}; + * </pre> + * + * @type {Object<string, (string|number|boolean)>|undefined} + */ +goog.global.CLOSURE_UNCOMPILED_DEFINES; + + +/** + * A hook for overriding the define values in uncompiled or compiled mode, + * like CLOSURE_UNCOMPILED_DEFINES but effective in compiled code. In + * uncompiled code CLOSURE_UNCOMPILED_DEFINES takes precedence. + * + * Also unlike CLOSURE_UNCOMPILED_DEFINES the values must be number, boolean or + * string literals or the compiler will emit an error. + * + * While any @define value may be set, only those set with goog.define will be + * effective for uncompiled code. + * + * Example: + * <pre> + * var CLOSURE_DEFINES = {'goog.DEBUG': false} ; + * </pre> + * + * @type {Object<string, (string|number|boolean)>|undefined} + */ +goog.global.CLOSURE_DEFINES; + + +/** + * Returns true if the specified value is not undefined. + * WARNING: Do not use this to test if an object has a property. Use the in + * operator instead. + * + * @param {?} val Variable to test. + * @return {boolean} Whether variable is defined. + */ +goog.isDef = function(val) { + // void 0 always evaluates to undefined and hence we do not need to depend on + // the definition of the global variable named 'undefined'. + return val !== void 0; +}; + + +/** + * Builds an object structure for the provided namespace path, ensuring that + * names that already exist are not overwritten. For example: + * "a.b.c" -> a = {};a.b={};a.b.c={}; + * Used by goog.provide and goog.exportSymbol. + * @param {string} name name of the object that this file defines. + * @param {*=} opt_object the object to expose at the end of the path. + * @param {Object=} opt_objectToExportTo The object to add the path to; default + * is |goog.global|. + * @private + */ +goog.exportPath_ = function(name, opt_object, opt_objectToExportTo) { + var parts = name.split('.'); + var cur = opt_objectToExportTo || goog.global; + + // Internet Explorer exhibits strange behavior when throwing errors from + // methods externed in this manner. See the testExportSymbolExceptions in + // base_test.html for an example. + if (!(parts[0] in cur) && cur.execScript) { + cur.execScript('var ' + parts[0]); + } + + // Certain browsers cannot parse code in the form for((a in b); c;); + // This pattern is produced by the JSCompiler when it collapses the + // statement above into the conditional loop below. To prevent this from + // happening, use a for-loop and reserve the init logic as below. + + // Parentheses added to eliminate strict JS warning in Firefox. + for (var part; parts.length && (part = parts.shift());) { + if (!parts.length && goog.isDef(opt_object)) { + // last part and we have an object; use it + cur[part] = opt_object; + } else if (cur[part]) { + cur = cur[part]; + } else { + cur = cur[part] = {}; + } + } +}; + + +/** + * Defines a named value. In uncompiled mode, the value is retrieved from + * CLOSURE_DEFINES or CLOSURE_UNCOMPILED_DEFINES if the object is defined and + * has the property specified, and otherwise used the defined defaultValue. + * When compiled the default can be overridden using the compiler + * options or the value set in the CLOSURE_DEFINES object. + * + * @param {string} name The distinguished name to provide. + * @param {string|number|boolean} defaultValue + */ +goog.define = function(name, defaultValue) { + var value = defaultValue; + if (!COMPILED) { + if (goog.global.CLOSURE_UNCOMPILED_DEFINES && + Object.prototype.hasOwnProperty.call( + goog.global.CLOSURE_UNCOMPILED_DEFINES, name)) { + value = goog.global.CLOSURE_UNCOMPILED_DEFINES[name]; + } else if ( + goog.global.CLOSURE_DEFINES && + Object.prototype.hasOwnProperty.call( + goog.global.CLOSURE_DEFINES, name)) { + value = goog.global.CLOSURE_DEFINES[name]; + } + } + goog.exportPath_(name, value); +}; + + +/** + * @define {boolean} DEBUG is provided as a convenience so that debugging code + * that should not be included in a production js_binary can be easily stripped + * by specifying --define goog.DEBUG=false to the JSCompiler. For example, most + * toString() methods should be declared inside an "if (goog.DEBUG)" conditional + * because they are generally used for debugging purposes and it is difficult + * for the JSCompiler to statically determine whether they are used. + */ +goog.define('goog.DEBUG', true); + + +/** + * @define {string} LOCALE defines the locale being used for compilation. It is + * used to select locale specific data to be compiled in js binary. BUILD rule + * can specify this value by "--define goog.LOCALE=<locale_name>" as JSCompiler + * option. + * + * Take into account that the locale code format is important. You should use + * the canonical Unicode format with hyphen as a delimiter. Language must be + * lowercase, Language Script - Capitalized, Region - UPPERCASE. + * There are few examples: pt-BR, en, en-US, sr-Latin-BO, zh-Hans-CN. + * + * See more info about locale codes here: + * http://www.unicode.org/reports/tr35/#Unicode_Language_and_Locale_Identifiers + * + * For language codes you should use values defined by ISO 693-1. See it here + * http://www.w3.org/WAI/ER/IG/ert/iso639.htm. There is only one exception from + * this rule: the Hebrew language. For legacy reasons the old code (iw) should + * be used instead of the new code (he), see http://wiki/Main/IIISynonyms. + */ +goog.define('goog.LOCALE', 'en'); // default to en + + +/** + * @define {boolean} Whether this code is running on trusted sites. + * + * On untrusted sites, several native functions can be defined or overridden by + * external libraries like Prototype, Datejs, and JQuery and setting this flag + * to false forces closure to use its own implementations when possible. + * + * If your JavaScript can be loaded by a third party site and you are wary about + * relying on non-standard implementations, specify + * "--define goog.TRUSTED_SITE=false" to the JSCompiler. + */ +goog.define('goog.TRUSTED_SITE', true); + + +/** + * @define {boolean} Whether a project is expected to be running in strict mode. + * + * This define can be used to trigger alternate implementations compatible with + * running in EcmaScript Strict mode or warn about unavailable functionality. + * @see https://goo.gl/PudQ4y + * + */ +goog.define('goog.STRICT_MODE_COMPATIBLE', false); + + +/** + * @define {boolean} Whether code that calls {@link goog.setTestOnly} should + * be disallowed in the compilation unit. + */ +goog.define('goog.DISALLOW_TEST_ONLY_CODE', COMPILED && !goog.DEBUG); + + +/** + * @define {boolean} Whether to use a Chrome app CSP-compliant method for + * loading scripts via goog.require. @see appendScriptSrcNode_. + */ +goog.define('goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING', false); + + +/** + * Defines a namespace in Closure. + * + * A namespace may only be defined once in a codebase. It may be defined using + * goog.provide() or goog.module(). + * + * The presence of one or more goog.provide() calls in a file indicates + * that the file defines the given objects/namespaces. + * Provided symbols must not be null or undefined. + * + * In addition, goog.provide() creates the object stubs for a namespace + * (for example, goog.provide("goog.foo.bar") will create the object + * goog.foo.bar if it does not already exist). + * + * Build tools also scan for provide/require/module statements + * to discern dependencies, build dependency files (see deps.js), etc. + * + * @see goog.require + * @see goog.module + * @param {string} name Namespace provided by this file in the form + * "goog.package.part". + */ +goog.provide = function(name) { + if (goog.isInModuleLoader_()) { + throw Error('goog.provide can not be used within a goog.module.'); + } + if (!COMPILED) { + // Ensure that the same namespace isn't provided twice. + // A goog.module/goog.provide maps a goog.require to a specific file + if (goog.isProvided_(name)) { + throw Error('Namespace "' + name + '" already declared.'); + } + } + + goog.constructNamespace_(name); +}; + + +/** + * @param {string} name Namespace provided by this file in the form + * "goog.package.part". + * @param {Object=} opt_obj The object to embed in the namespace. + * @private + */ +goog.constructNamespace_ = function(name, opt_obj) { + if (!COMPILED) { + delete goog.implicitNamespaces_[name]; + + var namespace = name; + while ((namespace = namespace.substring(0, namespace.lastIndexOf('.')))) { + if (goog.getObjectByName(namespace)) { + break; + } + goog.implicitNamespaces_[namespace] = true; + } + } + + goog.exportPath_(name, opt_obj); +}; + + +/** + * Module identifier validation regexp. + * Note: This is a conservative check, it is very possible to be more lenient, + * the primary exclusion here is "/" and "\" and a leading ".", these + * restrictions are intended to leave the door open for using goog.require + * with relative file paths rather than module identifiers. + * @private + */ +goog.VALID_MODULE_RE_ = /^[a-zA-Z_$][a-zA-Z0-9._$]*$/; + + +/** + * Defines a module in Closure. + * + * Marks that this file must be loaded as a module and claims the namespace. + * + * A namespace may only be defined once in a codebase. It may be defined using + * goog.provide() or goog.module(). + * + * goog.module() has three requirements: + * - goog.module may not be used in the same file as goog.provide. + * - goog.module must be the first statement in the file. + * - only one goog.module is allowed per file. + * + * When a goog.module annotated file is loaded, it is enclosed in + * a strict function closure. This means that: + * - any variables declared in a goog.module file are private to the file + * (not global), though the compiler is expected to inline the module. + * - The code must obey all the rules of "strict" JavaScript. + * - the file will be marked as "use strict" + * + * NOTE: unlike goog.provide, goog.module does not declare any symbols by + * itself. If declared symbols are desired, use + * goog.module.declareLegacyNamespace(). + * + * + * See the public goog.module proposal: http://goo.gl/Va1hin + * + * @param {string} name Namespace provided by this file in the form + * "goog.package.part", is expected but not required. + */ +goog.module = function(name) { + if (!goog.isString(name) || !name || + name.search(goog.VALID_MODULE_RE_) == -1) { + throw Error('Invalid module identifier'); + } + if (!goog.isInModuleLoader_()) { + throw Error('Module ' + name + ' has been loaded incorrectly.'); + } + if (goog.moduleLoaderState_.moduleName) { + throw Error('goog.module may only be called once per module.'); + } + + // Store the module name for the loader. + goog.moduleLoaderState_.moduleName = name; + if (!COMPILED) { + // Ensure that the same namespace isn't provided twice. + // A goog.module/goog.provide maps a goog.require to a specific file + if (goog.isProvided_(name)) { + throw Error('Namespace "' + name + '" already declared.'); + } + delete goog.implicitNamespaces_[name]; + } +}; + + +/** + * @param {string} name The module identifier. + * @return {?} The module exports for an already loaded module or null. + * + * Note: This is not an alternative to goog.require, it does not + * indicate a hard dependency, instead it is used to indicate + * an optional dependency or to access the exports of a module + * that has already been loaded. + * @suppress {missingProvide} + */ +goog.module.get = function(name) { + return goog.module.getInternal_(name); +}; + + +/** + * @param {string} name The module identifier. + * @return {?} The module exports for an already loaded module or null. + * @private + */ +goog.module.getInternal_ = function(name) { + if (!COMPILED) { + if (goog.isProvided_(name)) { + // goog.require only return a value with-in goog.module files. + return name in goog.loadedModules_ ? goog.loadedModules_[name] : + goog.getObjectByName(name); + } else { + return null; + } + } +}; + + +/** + * @private {?{moduleName: (string|undefined), declareLegacyNamespace:boolean}} + */ +goog.moduleLoaderState_ = null; + + +/** + * @private + * @return {boolean} Whether a goog.module is currently being initialized. + */ +goog.isInModuleLoader_ = function() { + return goog.moduleLoaderState_ != null; +}; + + +/** + * Provide the module's exports as a globally accessible object under the + * module's declared name. This is intended to ease migration to goog.module + * for files that have existing usages. + * @suppress {missingProvide} + */ +goog.module.declareLegacyNamespace = function() { + if (!COMPILED && !goog.isInModuleLoader_()) { + throw new Error( + 'goog.module.declareLegacyNamespace must be called from ' + + 'within a goog.module'); + } + if (!COMPILED && !goog.moduleLoaderState_.moduleName) { + throw Error( + 'goog.module must be called prior to ' + + 'goog.module.declareLegacyNamespace.'); + } + goog.moduleLoaderState_.declareLegacyNamespace = true; +}; + + +/** + * Marks that the current file should only be used for testing, and never for + * live code in production. + * + * In the case of unit tests, the message may optionally be an exact namespace + * for the test (e.g. 'goog.stringTest'). The linter will then ignore the extra + * provide (if not explicitly defined in the code). + * + * @param {string=} opt_message Optional message to add to the error that's + * raised when used in production code. + */ +goog.setTestOnly = function(opt_message) { + if (goog.DISALLOW_TEST_ONLY_CODE) { + opt_message = opt_message || ''; + throw Error( + 'Importing test-only code into non-debug environment' + + (opt_message ? ': ' + opt_message : '.')); + } +}; + + +/** + * Forward declares a symbol. This is an indication to the compiler that the + * symbol may be used in the source yet is not required and may not be provided + * in compilation. + * + * The most common usage of forward declaration is code that takes a type as a + * function parameter but does not need to require it. By forward declaring + * instead of requiring, no hard dependency is made, and (if not required + * elsewhere) the namespace may never be required and thus, not be pulled + * into the JavaScript binary. If it is required elsewhere, it will be type + * checked as normal. + * + * + * @param {string} name The namespace to forward declare in the form of + * "goog.package.part". + */ +goog.forwardDeclare = function(name) {}; + + +/** + * Forward declare type information. Used to assign types to goog.global + * referenced object that would otherwise result in unknown type references + * and thus block property disambiguation. + */ +goog.forwardDeclare('Document'); +goog.forwardDeclare('HTMLScriptElement'); +goog.forwardDeclare('XMLHttpRequest'); + + +if (!COMPILED) { + /** + * Check if the given name has been goog.provided. This will return false for + * names that are available only as implicit namespaces. + * @param {string} name name of the object to look for. + * @return {boolean} Whether the name has been provided. + * @private + */ + goog.isProvided_ = function(name) { + return (name in goog.loadedModules_) || + (!goog.implicitNamespaces_[name] && + goog.isDefAndNotNull(goog.getObjectByName(name))); + }; + + /** + * Namespaces implicitly defined by goog.provide. For example, + * goog.provide('goog.events.Event') implicitly declares that 'goog' and + * 'goog.events' must be namespaces. + * + * @type {!Object<string, (boolean|undefined)>} + * @private + */ + goog.implicitNamespaces_ = {'goog.module': true}; + + // NOTE: We add goog.module as an implicit namespace as goog.module is defined + // here and because the existing module package has not been moved yet out of + // the goog.module namespace. This satisifies both the debug loader and + // ahead-of-time dependency management. +} + + +/** + * Returns an object based on its fully qualified external name. The object + * is not found if null or undefined. If you are using a compilation pass that + * renames property names beware that using this function will not find renamed + * properties. + * + * @param {string} name The fully qualified name. + * @param {Object=} opt_obj The object within which to look; default is + * |goog.global|. + * @return {?} The value (object or primitive) or, if not found, null. + */ +goog.getObjectByName = function(name, opt_obj) { + var parts = name.split('.'); + var cur = opt_obj || goog.global; + for (var part; part = parts.shift();) { + if (goog.isDefAndNotNull(cur[part])) { + cur = cur[part]; + } else { + return null; + } + } + return cur; +}; + + +/** + * Globalizes a whole namespace, such as goog or goog.lang. + * + * @param {!Object} obj The namespace to globalize. + * @param {Object=} opt_global The object to add the properties to. + * @deprecated Properties may be explicitly exported to the global scope, but + * this should no longer be done in bulk. + */ +goog.globalize = function(obj, opt_global) { + var global = opt_global || goog.global; + for (var x in obj) { + global[x] = obj[x]; + } +}; + + +/** + * Adds a dependency from a file to the files it requires. + * @param {string} relPath The path to the js file. + * @param {!Array<string>} provides An array of strings with + * the names of the objects this file provides. + * @param {!Array<string>} requires An array of strings with + * the names of the objects this file requires. + * @param {boolean|!Object<string>=} opt_loadFlags Parameters indicating + * how the file must be loaded. The boolean 'true' is equivalent + * to {'module': 'goog'} for backwards-compatibility. Valid properties + * and values include {'module': 'goog'} and {'lang': 'es6'}. + */ +goog.addDependency = function(relPath, provides, requires, opt_loadFlags) { + if (goog.DEPENDENCIES_ENABLED) { + var provide, require; + var path = relPath.replace(/\\/g, '/'); + var deps = goog.dependencies_; + if (!opt_loadFlags || typeof opt_loadFlags === 'boolean') { + opt_loadFlags = opt_loadFlags ? {'module': 'goog'} : {}; + } + for (var i = 0; provide = provides[i]; i++) { + deps.nameToPath[provide] = path; + deps.loadFlags[path] = opt_loadFlags; + } + for (var j = 0; require = requires[j]; j++) { + if (!(path in deps.requires)) { + deps.requires[path] = {}; + } + deps.requires[path][require] = true; + } + } +}; + + + + +// NOTE(nnaze): The debug DOM loader was included in base.js as an original way +// to do "debug-mode" development. The dependency system can sometimes be +// confusing, as can the debug DOM loader's asynchronous nature. +// +// With the DOM loader, a call to goog.require() is not blocking -- the script +// will not load until some point after the current script. If a namespace is +// needed at runtime, it needs to be defined in a previous script, or loaded via +// require() with its registered dependencies. +// +// User-defined namespaces may need their own deps file. For a reference on +// creating a deps file, see: +// Externally: https://developers.google.com/closure/library/docs/depswriter +// +// Because of legacy clients, the DOM loader can't be easily removed from +// base.js. Work is being done to make it disableable or replaceable for +// different environments (DOM-less JavaScript interpreters like Rhino or V8, +// for example). See bootstrap/ for more information. + + +/** + * @define {boolean} Whether to enable the debug loader. + * + * If enabled, a call to goog.require() will attempt to load the namespace by + * appending a script tag to the DOM (if the namespace has been registered). + * + * If disabled, goog.require() will simply assert that the namespace has been + * provided (and depend on the fact that some outside tool correctly ordered + * the script). + */ +goog.define('goog.ENABLE_DEBUG_LOADER', true); + + +/** + * @param {string} msg + * @private + */ +goog.logToConsole_ = function(msg) { + if (goog.global.console) { + goog.global.console['error'](msg); + } +}; + + +/** + * Implements a system for the dynamic resolution of dependencies that works in + * parallel with the BUILD system. Note that all calls to goog.require will be + * stripped by the JSCompiler when the --process_closure_primitives option is + * used. + * @see goog.provide + * @param {string} name Namespace to include (as was given in goog.provide()) in + * the form "goog.package.part". + * @return {?} If called within a goog.module file, the associated namespace or + * module otherwise null. + */ +goog.require = function(name) { + // If the object already exists we do not need do do anything. + if (!COMPILED) { + if (goog.ENABLE_DEBUG_LOADER && goog.IS_OLD_IE_) { + goog.maybeProcessDeferredDep_(name); + } + + if (goog.isProvided_(name)) { + if (goog.isInModuleLoader_()) { + return goog.module.getInternal_(name); + } else { + return null; + } + } + + if (goog.ENABLE_DEBUG_LOADER) { + var path = goog.getPathFromDeps_(name); + if (path) { + goog.writeScripts_(path); + return null; + } + } + + var errorMessage = 'goog.require could not find: ' + name; + goog.logToConsole_(errorMessage); + + throw Error(errorMessage); + } +}; + + +/** + * Path for included scripts. + * @type {string} + */ +goog.basePath = ''; + + +/** + * A hook for overriding the base path. + * @type {string|undefined} + */ +goog.global.CLOSURE_BASE_PATH; + + +/** + * Whether to write out Closure's deps file. By default, the deps are written. + * @type {boolean|undefined} + */ +goog.global.CLOSURE_NO_DEPS; + + +/** + * A function to import a single script. This is meant to be overridden when + * Closure is being run in non-HTML contexts, such as web workers. It's defined + * in the global scope so that it can be set before base.js is loaded, which + * allows deps.js to be imported properly. + * + * The function is passed the script source, which is a relative URI. It should + * return true if the script was imported, false otherwise. + * @type {(function(string): boolean)|undefined} + */ +goog.global.CLOSURE_IMPORT_SCRIPT; + + +/** + * Null function used for default values of callbacks, etc. + * @return {void} Nothing. + */ +goog.nullFunction = function() {}; + + +/** + * When defining a class Foo with an abstract method bar(), you can do: + * Foo.prototype.bar = goog.abstractMethod + * + * Now if a subclass of Foo fails to override bar(), an error will be thrown + * when bar() is invoked. + * + * Note: This does not take the name of the function to override as an argument + * because that would make it more difficult to obfuscate our JavaScript code. + * + * @type {!Function} + * @throws {Error} when invoked to indicate the method should be overridden. + */ +goog.abstractMethod = function() { + throw Error('unimplemented abstract method'); +}; + + +/** + * Adds a {@code getInstance} static method that always returns the same + * instance object. + * @param {!Function} ctor The constructor for the class to add the static + * method to. + */ +goog.addSingletonGetter = function(ctor) { + ctor.getInstance = function() { + if (ctor.instance_) { + return ctor.instance_; + } + if (goog.DEBUG) { + // NOTE: JSCompiler can't optimize away Array#push. + goog.instantiatedSingletons_[goog.instantiatedSingletons_.length] = ctor; + } + return ctor.instance_ = new ctor; + }; +}; + + +/** + * All singleton classes that have been instantiated, for testing. Don't read + * it directly, use the {@code goog.testing.singleton} module. The compiler + * removes this variable if unused. + * @type {!Array<!Function>} + * @private + */ +goog.instantiatedSingletons_ = []; + + +/** + * @define {boolean} Whether to load goog.modules using {@code eval} when using + * the debug loader. This provides a better debugging experience as the + * source is unmodified and can be edited using Chrome Workspaces or similar. + * However in some environments the use of {@code eval} is banned + * so we provide an alternative. + */ +goog.define('goog.LOAD_MODULE_USING_EVAL', true); + + +/** + * @define {boolean} Whether the exports of goog.modules should be sealed when + * possible. + */ +goog.define('goog.SEAL_MODULE_EXPORTS', goog.DEBUG); + + +/** + * The registry of initialized modules: + * the module identifier to module exports map. + * @private @const {!Object<string, ?>} + */ +goog.loadedModules_ = {}; + + +/** + * True if goog.dependencies_ is available. + * @const {boolean} + */ +goog.DEPENDENCIES_ENABLED = !COMPILED && goog.ENABLE_DEBUG_LOADER; + + +/** + * @define {string} How to decide whether to transpile. Valid values + * are 'always', 'never', and 'detect'. The default ('detect') is to + * use feature detection to determine which language levels need + * transpilation. + */ +// NOTE(user): we could expand this to accept a language level to bypass +// detection: e.g. goog.TRANSPILE == 'es5' would transpile ES6 files but +// would leave ES3 and ES5 files alone. +goog.define('goog.TRANSPILE', 'detect'); + + +/** + * @define {string} Path to the transpiler. Executing the script at this + * path (relative to base.js) should define a function $jscomp.transpile. + */ +goog.define('goog.TRANSPILER', 'transpile.js'); + + +if (goog.DEPENDENCIES_ENABLED) { + /** + * This object is used to keep track of dependencies and other data that is + * used for loading scripts. + * @private + * @type {{ + * loadFlags: !Object<string, !Object<string, string>>, + * nameToPath: !Object<string, string>, + * requires: !Object<string, !Object<string, boolean>>, + * visited: !Object<string, boolean>, + * written: !Object<string, boolean>, + * deferred: !Object<string, string> + * }} + */ + goog.dependencies_ = { + loadFlags: {}, // 1 to 1 + + nameToPath: {}, // 1 to 1 + + requires: {}, // 1 to many + + // Used when resolving dependencies to prevent us from visiting file twice. + visited: {}, + + written: {}, // Used to keep track of script files we have written. + + deferred: {} // Used to track deferred module evaluations in old IEs + }; + + + /** + * Tries to detect whether is in the context of an HTML document. + * @return {boolean} True if it looks like HTML document. + * @private + */ + goog.inHtmlDocument_ = function() { + /** @type {Document} */ + var doc = goog.global.document; + return doc != null && 'write' in doc; // XULDocument misses write. + }; + + + /** + * Tries to detect the base path of base.js script that bootstraps Closure. + * @private + */ + goog.findBasePath_ = function() { + if (goog.isDef(goog.global.CLOSURE_BASE_PATH)) { + goog.basePath = goog.global.CLOSURE_BASE_PATH; + return; + } else if (!goog.inHtmlDocument_()) { + return; + } + /** @type {Document} */ + var doc = goog.global.document; + var scripts = doc.getElementsByTagName('SCRIPT'); + // Search backwards since the current script is in almost all cases the one + // that has base.js. + for (var i = scripts.length - 1; i >= 0; --i) { + var script = /** @type {!HTMLScriptElement} */ (scripts[i]); + var src = script.src; + var qmark = src.lastIndexOf('?'); + var l = qmark == -1 ? src.length : qmark; + if (src.substr(l - 7, 7) == 'base.js') { + goog.basePath = src.substr(0, l - 7); + return; + } + } + }; + + + /** + * Imports a script if, and only if, that script hasn't already been imported. + * (Must be called at execution time) + * @param {string} src Script source. + * @param {string=} opt_sourceText The optionally source text to evaluate + * @private + */ + goog.importScript_ = function(src, opt_sourceText) { + var importScript = + goog.global.CLOSURE_IMPORT_SCRIPT || goog.writeScriptTag_; + if (importScript(src, opt_sourceText)) { + goog.dependencies_.written[src] = true; + } + }; + + + /** + * Whether the browser is IE9 or earlier, which needs special handling + * for deferred modules. + * @const @private {boolean} + */ + goog.IS_OLD_IE_ = + !!(!goog.global.atob && goog.global.document && goog.global.document.all); + + + /** + * Given a URL initiate retrieval and execution of a script that needs + * pre-processing. + * @param {string} src Script source URL. + * @param {boolean} isModule Whether this is a goog.module. + * @param {boolean} needsTranspile Whether this source needs transpilation. + * @private + */ + goog.importProcessedScript_ = function(src, isModule, needsTranspile) { + // In an attempt to keep browsers from timing out loading scripts using + // synchronous XHRs, put each load in its own script block. + var bootstrap = 'goog.retrieveAndExec_("' + src + '", ' + isModule + ', ' + + needsTranspile + ');'; + + goog.importScript_('', bootstrap); + }; + + + /** @private {!Array<string>} */ + goog.queuedModules_ = []; + + + /** + * Return an appropriate module text. Suitable to insert into + * a script tag (that is unescaped). + * @param {string} srcUrl + * @param {string} scriptText + * @return {string} + * @private + */ + goog.wrapModule_ = function(srcUrl, scriptText) { + if (!goog.LOAD_MODULE_USING_EVAL || !goog.isDef(goog.global.JSON)) { + return '' + + 'goog.loadModule(function(exports) {' + + '"use strict";' + scriptText + + '\n' + // terminate any trailing single line comment. + ';return exports' + + '});' + + '\n//# sourceURL=' + srcUrl + '\n'; + } else { + return '' + + 'goog.loadModule(' + + goog.global.JSON.stringify( + scriptText + '\n//# sourceURL=' + srcUrl + '\n') + + ');'; + } + }; + + // On IE9 and earlier, it is necessary to handle + // deferred module loads. In later browsers, the + // code to be evaluated is simply inserted as a script + // block in the correct order. To eval deferred + // code at the right time, we piggy back on goog.require to call + // goog.maybeProcessDeferredDep_. + // + // The goog.requires are used both to bootstrap + // the loading process (when no deps are available) and + // declare that they should be available. + // + // Here we eval the sources, if all the deps are available + // either already eval'd or goog.require'd. This will + // be the case when all the dependencies have already + // been loaded, and the dependent module is loaded. + // + // But this alone isn't sufficient because it is also + // necessary to handle the case where there is no root + // that is not deferred. For that there we register for an event + // and trigger goog.loadQueuedModules_ handle any remaining deferred + // evaluations. + + /** + * Handle any remaining deferred goog.module evals. + * @private + */ + goog.loadQueuedModules_ = function() { + var count = goog.queuedModules_.length; + if (count > 0) { + var queue = goog.queuedModules_; + goog.queuedModules_ = []; + for (var i = 0; i < count; i++) { + var path = queue[i]; + goog.maybeProcessDeferredPath_(path); + } + } + }; + + + /** + * Eval the named module if its dependencies are + * available. + * @param {string} name The module to load. + * @private + */ + goog.maybeProcessDeferredDep_ = function(name) { + if (goog.isDeferredModule_(name) && goog.allDepsAreAvailable_(name)) { + var path = goog.getPathFromDeps_(name); + goog.maybeProcessDeferredPath_(goog.basePath + path); + } + }; + + /** + * @param {string} name The module to check. + * @return {boolean} Whether the name represents a + * module whose evaluation has been deferred. + * @private + */ + goog.isDeferredModule_ = function(name) { + var path = goog.getPathFromDeps_(name); + var loadFlags = path && goog.dependencies_.loadFlags[path] || {}; + if (path && (loadFlags['module'] == 'goog' || + goog.needsTranspile_(loadFlags['lang']))) { + var abspath = goog.basePath + path; + return (abspath) in goog.dependencies_.deferred; + } + return false; + }; + + /** + * @param {string} name The module to check. + * @return {boolean} Whether the name represents a + * module whose declared dependencies have all been loaded + * (eval'd or a deferred module load) + * @private + */ + goog.allDepsAreAvailable_ = function(name) { + var path = goog.getPathFromDeps_(name); + if (path && (path in goog.dependencies_.requires)) { + for (var requireName in goog.dependencies_.requires[path]) { + if (!goog.isProvided_(requireName) && + !goog.isDeferredModule_(requireName)) { + return false; + } + } + } + return true; + }; + + + /** + * @param {string} abspath + * @private + */ + goog.maybeProcessDeferredPath_ = function(abspath) { + if (abspath in goog.dependencies_.deferred) { + var src = goog.dependencies_.deferred[abspath]; + delete goog.dependencies_.deferred[abspath]; + goog.globalEval(src); + } + }; + + + /** + * Load a goog.module from the provided URL. This is not a general purpose + * code loader and does not support late loading code, that is it should only + * be used during page load. This method exists to support unit tests and + * "debug" loaders that would otherwise have inserted script tags. Under the + * hood this needs to use a synchronous XHR and is not recommeneded for + * production code. + * + * The module's goog.requires must have already been satisified; an exception + * will be thrown if this is not the case. This assumption is that no + * "deps.js" file exists, so there is no way to discover and locate the + * module-to-be-loaded's dependencies and no attempt is made to do so. + * + * There should only be one attempt to load a module. If + * "goog.loadModuleFromUrl" is called for an already loaded module, an + * exception will be throw. + * + * @param {string} url The URL from which to attempt to load the goog.module. + */ + goog.loadModuleFromUrl = function(url) { + // Because this executes synchronously, we don't need to do any additional + // bookkeeping. When "goog.loadModule" the namespace will be marked as + // having been provided which is sufficient. + goog.retrieveAndExec_(url, true, false); + }; + + + /** + * @param {function(?):?|string} moduleDef The module definition. + */ + goog.loadModule = function(moduleDef) { + // NOTE: we allow function definitions to be either in the from + // of a string to eval (which keeps the original source intact) or + // in a eval forbidden environment (CSP) we allow a function definition + // which in its body must call {@code goog.module}, and return the exports + // of the module. + var previousState = goog.moduleLoaderState_; + try { + goog.moduleLoaderState_ = { + moduleName: undefined, + declareLegacyNamespace: false + }; + var exports; + if (goog.isFunction(moduleDef)) { + exports = moduleDef.call(goog.global, {}); + } else if (goog.isString(moduleDef)) { + exports = goog.loadModuleFromSource_.call(goog.global, moduleDef); + } else { + throw Error('Invalid module definition'); + } + + var moduleName = goog.moduleLoaderState_.moduleName; + if (!goog.isString(moduleName) || !moduleName) { + throw Error('Invalid module name \"' + moduleName + '\"'); + } + + // Don't seal legacy namespaces as they may be uses as a parent of + // another namespace + if (goog.moduleLoaderState_.declareLegacyNamespace) { + goog.constructNamespace_(moduleName, exports); + } else if (goog.SEAL_MODULE_EXPORTS && Object.seal) { + Object.seal(exports); + } + + goog.loadedModules_[moduleName] = exports; + } finally { + goog.moduleLoaderState_ = previousState; + } + }; + + + /** + * @private @const {function(string):?} + * + * The new type inference warns because this function has no formal + * parameters, but its jsdoc says that it takes one argument. + * (The argument is used via arguments[0], but NTI does not detect this.) + * @suppress {newCheckTypes} + */ + goog.loadModuleFromSource_ = function() { + // NOTE: we avoid declaring parameters or local variables here to avoid + // masking globals or leaking values into the module definition. + 'use strict'; + var exports = {}; + eval(arguments[0]); + return exports; + }; + + + /** + * Writes a new script pointing to {@code src} directly into the DOM. + * + * NOTE: This method is not CSP-compliant. @see goog.appendScriptSrcNode_ for + * the fallback mechanism. + * + * @param {string} src The script URL. + * @private + */ + goog.writeScriptSrcNode_ = function(src) { + goog.global.document.write( + '<script type="text/javascript" src="' + src + '"></' + + 'script>'); + }; + + + /** + * Appends a new script node to the DOM using a CSP-compliant mechanism. This + * method exists as a fallback for document.write (which is not allowed in a + * strict CSP context, e.g., Chrome apps). + * + * NOTE: This method is not analogous to using document.write to insert a + * <script> tag; specifically, the user agent will execute a script added by + * document.write immediately after the current script block finishes + * executing, whereas the DOM-appended script node will not be executed until + * the entire document is parsed and executed. That is to say, this script is + * added to the end of the script execution queue. + * + * The page must not attempt to call goog.required entities until after the + * document has loaded, e.g., in or after the window.onload callback. + * + * @param {string} src The script URL. + * @private + */ + goog.appendScriptSrcNode_ = function(src) { + /** @type {Document} */ + var doc = goog.global.document; + var scriptEl = + /** @type {HTMLScriptElement} */ (doc.createElement('script')); + scriptEl.type = 'text/javascript'; + scriptEl.src = src; + scriptEl.defer = false; + scriptEl.async = false; + doc.head.appendChild(scriptEl); + }; + + + /** + * The default implementation of the import function. Writes a script tag to + * import the script. + * + * @param {string} src The script url. + * @param {string=} opt_sourceText The optionally source text to evaluate + * @return {boolean} True if the script was imported, false otherwise. + * @private + */ + goog.writeScriptTag_ = function(src, opt_sourceText) { + if (goog.inHtmlDocument_()) { + /** @type {!HTMLDocument} */ + var doc = goog.global.document; + + // If the user tries to require a new symbol after document load, + // something has gone terribly wrong. Doing a document.write would + // wipe out the page. This does not apply to the CSP-compliant method + // of writing script tags. + if (!goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING && + doc.readyState == 'complete') { + // Certain test frameworks load base.js multiple times, which tries + // to write deps.js each time. If that happens, just fail silently. + // These frameworks wipe the page between each load of base.js, so this + // is OK. + var isDeps = /\bdeps.js$/.test(src); + if (isDeps) { + return false; + } else { + throw Error('Cannot write "' + src + '" after document load'); + } + } + + if (opt_sourceText === undefined) { + if (!goog.IS_OLD_IE_) { + if (goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING) { + goog.appendScriptSrcNode_(src); + } else { + goog.writeScriptSrcNode_(src); + } + } else { + var state = " onreadystatechange='goog.onScriptLoad_(this, " + + ++goog.lastNonModuleScriptIndex_ + ")' "; + doc.write( + '<script type="text/javascript" src="' + src + '"' + state + + '></' + + 'script>'); + } + } else { + doc.write( + '<script type="text/javascript">' + opt_sourceText + '</' + + 'script>'); + } + return true; + } else { + return false; + } + }; + + + /** + * Determines whether the given language needs to be transpiled. + * @param {string} lang + * @return {boolean} + * @private + */ + goog.needsTranspile_ = function(lang) { + if (goog.TRANSPILE == 'always') { + return true; + } else if (goog.TRANSPILE == 'never') { + return false; + } else if (!goog.transpiledLanguages_) { + goog.transpiledLanguages_ = {'es5': true, 'es6': true, 'es6-impl': true}; + /** @preserveTry */ + try { + // Perform some quick conformance checks, to distinguish + // between browsers that support es5, es6-impl, or es6. + + // Identify ES3-only browsers by their incorrect treatment of commas. + goog.transpiledLanguages_['es5'] = eval('[1,].length!=1'); + + // As browsers mature, features will be moved from the full test + // into the impl test. This must happen before the corresponding + // features are changed in the Closure Compiler's FeatureSet object. + + // Test 1: es6-impl [FF49, Edge 13, Chrome 49] + // (a) let/const keyword, (b) class expressions, (c) Map object, + // (d) iterable arguments, (e) spread operator + var es6implTest = + 'let a={};const X=class{constructor(){}x(z){return new Map([' + + '...arguments]).get(z[0])==3}};return new X().x([a,3])'; + + // Test 2: es6 [FF50 (?), Edge 14 (?), Chrome 50] + // (a) default params (specifically shadowing locals), + // (b) destructuring, (c) block-scoped functions, + // (d) for-of (const), (e) new.target/Reflect.construct + var es6fullTest = + 'class X{constructor(){if(new.target!=String)throw 1;this.x=42}}' + + 'let q=Reflect.construct(X,[],String);if(q.x!=42||!(q instanceof ' + + 'String))throw 1;for(const a of[2,3]){if(a==2)continue;function ' + + 'f(z={a}){let a=0;return z.a}{function f(){return 0;}}return f()' + + '==3}'; + + if (eval('(()=>{"use strict";' + es6implTest + '})()')) { + goog.transpiledLanguages_['es6-impl'] = false; + } + if (eval('(()=>{"use strict";' + es6fullTest + '})()')) { + goog.transpiledLanguages_['es6'] = false; + } + } catch (err) { + } + } + return !!goog.transpiledLanguages_[lang]; + }; + + + /** @private {?Object<string, boolean>} */ + goog.transpiledLanguages_ = null; + + + /** @private {number} */ + goog.lastNonModuleScriptIndex_ = 0; + + + /** + * A readystatechange handler for legacy IE + * @param {!HTMLScriptElement} script + * @param {number} scriptIndex + * @return {boolean} + * @private + */ + goog.onScriptLoad_ = function(script, scriptIndex) { + // for now load the modules when we reach the last script, + // later allow more inter-mingling. + if (script.readyState == 'complete' && + goog.lastNonModuleScriptIndex_ == scriptIndex) { + goog.loadQueuedModules_(); + } + return true; + }; + + /** + * Resolves dependencies based on the dependencies added using addDependency + * and calls importScript_ in the correct order. + * @param {string} pathToLoad The path from which to start discovering + * dependencies. + * @private + */ + goog.writeScripts_ = function(pathToLoad) { + /** @type {!Array<string>} The scripts we need to write this time. */ + var scripts = []; + var seenScript = {}; + var deps = goog.dependencies_; + + /** @param {string} path */ + function visitNode(path) { + if (path in deps.written) { + return; + } + + // We have already visited this one. We can get here if we have cyclic + // dependencies. + if (path in deps.visited) { + return; + } + + deps.visited[path] = true; + + if (path in deps.requires) { + for (var requireName in deps.requires[path]) { + // If the required name is defined, we assume that it was already + // bootstrapped by other means. + if (!goog.isProvided_(requireName)) { + if (requireName in deps.nameToPath) { + visitNode(deps.nameToPath[requireName]); + } else { + throw Error('Undefined nameToPath for ' + requireName); + } + } + } + } + + if (!(path in seenScript)) { + seenScript[path] = true; + scripts.push(path); + } + } + + visitNode(pathToLoad); + + // record that we are going to load all these scripts. + for (var i = 0; i < scripts.length; i++) { + var path = scripts[i]; + goog.dependencies_.written[path] = true; + } + + // If a module is loaded synchronously then we need to + // clear the current inModuleLoader value, and restore it when we are + // done loading the current "requires". + var moduleState = goog.moduleLoaderState_; + goog.moduleLoaderState_ = null; + + for (var i = 0; i < scripts.length; i++) { + var path = scripts[i]; + if (path) { + var loadFlags = deps.loadFlags[path] || {}; + var needsTranspile = goog.needsTranspile_(loadFlags['lang']); + if (loadFlags['module'] == 'goog' || needsTranspile) { + goog.importProcessedScript_( + goog.basePath + path, loadFlags['module'] == 'goog', + needsTranspile); + } else { + goog.importScript_(goog.basePath + path); + } + } else { + goog.moduleLoaderState_ = moduleState; + throw Error('Undefined script input'); + } + } + + // restore the current "module loading state" + goog.moduleLoaderState_ = moduleState; + }; + + + /** + * Looks at the dependency rules and tries to determine the script file that + * fulfills a particular rule. + * @param {string} rule In the form goog.namespace.Class or project.script. + * @return {?string} Url corresponding to the rule, or null. + * @private + */ + goog.getPathFromDeps_ = function(rule) { + if (rule in goog.dependencies_.nameToPath) { + return goog.dependencies_.nameToPath[rule]; + } else { + return null; + } + }; + + goog.findBasePath_(); + + // Allow projects to manage the deps files themselves. + if (!goog.global.CLOSURE_NO_DEPS) { + goog.importScript_(goog.basePath + 'deps.js'); + } +} + + +/** + * Normalize a file path by removing redundant ".." and extraneous "." file + * path components. + * @param {string} path + * @return {string} + * @private + */ +goog.normalizePath_ = function(path) { + var components = path.split('/'); + var i = 0; + while (i < components.length) { + if (components[i] == '.') { + components.splice(i, 1); + } else if ( + i && components[i] == '..' && components[i - 1] && + components[i - 1] != '..') { + components.splice(--i, 2); + } else { + i++; + } + } + return components.join('/'); +}; + + +/** + * Loads file by synchronous XHR. Should not be used in production environments. + * @param {string} src Source URL. + * @return {?string} File contents, or null if load failed. + * @private + */ +goog.loadFileSync_ = function(src) { + if (goog.global.CLOSURE_LOAD_FILE_SYNC) { + return goog.global.CLOSURE_LOAD_FILE_SYNC(src); + } else { + try { + /** @type {XMLHttpRequest} */ + var xhr = new goog.global['XMLHttpRequest'](); + xhr.open('get', src, false); + xhr.send(); + // NOTE: Successful http: requests have a status of 200, but successful + // file: requests may have a status of zero. Any other status, or a + // thrown exception (particularly in case of file: requests) indicates + // some sort of error, which we treat as a missing or unavailable file. + return xhr.status == 0 || xhr.status == 200 ? xhr.responseText : null; + } catch (err) { + // No need to rethrow or log, since errors should show up on their own. + return null; + } + } +}; + + +/** + * Retrieve and execute a script that needs some sort of wrapping. + * @param {string} src Script source URL. + * @param {boolean} isModule Whether to load as a module. + * @param {boolean} needsTranspile Whether to transpile down to ES3. + * @private + */ +goog.retrieveAndExec_ = function(src, isModule, needsTranspile) { + if (!COMPILED) { + // The full but non-canonicalized URL for later use. + var originalPath = src; + // Canonicalize the path, removing any /./ or /../ since Chrome's debugging + // console doesn't auto-canonicalize XHR loads as it does <script> srcs. + src = goog.normalizePath_(src); + + var importScript = + goog.global.CLOSURE_IMPORT_SCRIPT || goog.writeScriptTag_; + + var scriptText = goog.loadFileSync_(src); + if (scriptText == null) { + throw new Error('Load of "' + src + '" failed'); + } + + if (needsTranspile) { + scriptText = goog.transpile_.call(goog.global, scriptText, src); + } + + if (isModule) { + scriptText = goog.wrapModule_(src, scriptText); + } else { + scriptText += '\n//# sourceURL=' + src; + } + var isOldIE = goog.IS_OLD_IE_; + if (isOldIE) { + goog.dependencies_.deferred[originalPath] = scriptText; + goog.queuedModules_.push(originalPath); + } else { + importScript(src, scriptText); + } + } +}; + + +/** + * Lazily retrieves the transpiler and applies it to the source. + * @param {string} code JS code. + * @param {string} path Path to the code. + * @return {string} The transpiled code. + * @private + */ +goog.transpile_ = function(code, path) { + var jscomp = goog.global['$jscomp']; + if (!jscomp) { + goog.global['$jscomp'] = jscomp = {}; + } + var transpile = jscomp.transpile; + if (!transpile) { + var transpilerPath = goog.basePath + goog.TRANSPILER; + var transpilerCode = goog.loadFileSync_(transpilerPath); + if (transpilerCode) { + // This must be executed synchronously, since by the time we know we + // need it, we're about to load and write the ES6 code synchronously, + // so a normal script-tag load will be too slow. + eval(transpilerCode + '\n//# sourceURL=' + transpilerPath); + // Note: transpile.js reassigns goog.global['$jscomp'] so pull it again. + jscomp = goog.global['$jscomp']; + transpile = jscomp.transpile; + } + } + if (!transpile) { + // The transpiler is an optional component. If it's not available then + // replace it with a pass-through function that simply logs. + var suffix = ' requires transpilation but no transpiler was found.'; + transpile = jscomp.transpile = function(code, path) { + // TODO(user): figure out some way to get this error to show up + // in test results, noting that the failure may occur in many + // different ways, including in loadModule() before the test + // runner even comes up. + goog.logToConsole_(path + suffix); + return code; + }; + } + // Note: any transpilation errors/warnings will be logged to the console. + return transpile(code, path); +}; + + +//============================================================================== +// Language Enhancements +//============================================================================== + + +/** + * This is a "fixed" version of the typeof operator. It differs from the typeof + * operator in such a way that null returns 'null' and arrays return 'array'. + * @param {?} value The value to get the type of. + * @return {string} The name of the type. + */ +goog.typeOf = function(value) { + var s = typeof value; + if (s == 'object') { + if (value) { + // Check these first, so we can avoid calling Object.prototype.toString if + // possible. + // + // IE improperly marshals typeof across execution contexts, but a + // cross-context object will still return false for "instanceof Object". + if (value instanceof Array) { + return 'array'; + } else if (value instanceof Object) { + return s; + } + + // HACK: In order to use an Object prototype method on the arbitrary + // value, the compiler requires the value be cast to type Object, + // even though the ECMA spec explicitly allows it. + var className = Object.prototype.toString.call( + /** @type {!Object} */ (value)); + // In Firefox 3.6, attempting to access iframe window objects' length + // property throws an NS_ERROR_FAILURE, so we need to special-case it + // here. + if (className == '[object Window]') { + return 'object'; + } + + // We cannot always use constructor == Array or instanceof Array because + // different frames have different Array objects. In IE6, if the iframe + // where the array was created is destroyed, the array loses its + // prototype. Then dereferencing val.splice here throws an exception, so + // we can't use goog.isFunction. Calling typeof directly returns 'unknown' + // so that will work. In this case, this function will return false and + // most array functions will still work because the array is still + // array-like (supports length and []) even though it has lost its + // prototype. + // Mark Miller noticed that Object.prototype.toString + // allows access to the unforgeable [[Class]] property. + // 15.2.4.2 Object.prototype.toString ( ) + // When the toString method is called, the following steps are taken: + // 1. Get the [[Class]] property of this object. + // 2. Compute a string value by concatenating the three strings + // "[object ", Result(1), and "]". + // 3. Return Result(2). + // and this behavior survives the destruction of the execution context. + if ((className == '[object Array]' || + // In IE all non value types are wrapped as objects across window + // boundaries (not iframe though) so we have to do object detection + // for this edge case. + typeof value.length == 'number' && + typeof value.splice != 'undefined' && + typeof value.propertyIsEnumerable != 'undefined' && + !value.propertyIsEnumerable('splice') + + )) { + return 'array'; + } + // HACK: There is still an array case that fails. + // function ArrayImpostor() {} + // ArrayImpostor.prototype = []; + // var impostor = new ArrayImpostor; + // this can be fixed by getting rid of the fast path + // (value instanceof Array) and solely relying on + // (value && Object.prototype.toString.vall(value) === '[object Array]') + // but that would require many more function calls and is not warranted + // unless closure code is receiving objects from untrusted sources. + + // IE in cross-window calls does not correctly marshal the function type + // (it appears just as an object) so we cannot use just typeof val == + // 'function'. However, if the object has a call property, it is a + // function. + if ((className == '[object Function]' || + typeof value.call != 'undefined' && + typeof value.propertyIsEnumerable != 'undefined' && + !value.propertyIsEnumerable('call'))) { + return 'function'; + } + + } else { + return 'null'; + } + + } else if (s == 'function' && typeof value.call == 'undefined') { + // In Safari typeof nodeList returns 'function', and on Firefox typeof + // behaves similarly for HTML{Applet,Embed,Object}, Elements and RegExps. We + // would like to return object for those and we can detect an invalid + // function by making sure that the function object has a call method. + return 'object'; + } + return s; +}; + + +/** + * Returns true if the specified value is null. + * @param {?} val Variable to test. + * @return {boolean} Whether variable is null. + */ +goog.isNull = function(val) { + return val === null; +}; + + +/** + * Returns true if the specified value is defined and not null. + * @param {?} val Variable to test. + * @return {boolean} Whether variable is defined and not null. + */ +goog.isDefAndNotNull = function(val) { + // Note that undefined == null. + return val != null; +}; + + +/** + * Returns true if the specified value is an array. + * @param {?} val Variable to test. + * @return {boolean} Whether variable is an array. + */ +goog.isArray = function(val) { + return goog.typeOf(val) == 'array'; +}; + + +/** + * Returns true if the object looks like an array. To qualify as array like + * the value needs to be either a NodeList or an object with a Number length + * property. As a special case, a function value is not array like, because its + * length property is fixed to correspond to the number of expected arguments. + * @param {?} val Variable to test. + * @return {boolean} Whether variable is an array. + */ +goog.isArrayLike = function(val) { + var type = goog.typeOf(val); + // We do not use goog.isObject here in order to exclude function values. + return type == 'array' || type == 'object' && typeof val.length == 'number'; +}; + + +/** + * Returns true if the object looks like a Date. To qualify as Date-like the + * value needs to be an object and have a getFullYear() function. + * @param {?} val Variable to test. + * @return {boolean} Whether variable is a like a Date. + */ +goog.isDateLike = function(val) { + return goog.isObject(val) && typeof val.getFullYear == 'function'; +}; + + +/** + * Returns true if the specified value is a string. + * @param {?} val Variable to test. + * @return {boolean} Whether variable is a string. + */ +goog.isString = function(val) { + return typeof val == 'string'; +}; + + +/** + * Returns true if the specified value is a boolean. + * @param {?} val Variable to test. + * @return {boolean} Whether variable is boolean. + */ +goog.isBoolean = function(val) { + return typeof val == 'boolean'; +}; + + +/** + * Returns true if the specified value is a number. + * @param {?} val Variable to test. + * @return {boolean} Whether variable is a number. + */ +goog.isNumber = function(val) { + return typeof val == 'number'; +}; + + +/** + * Returns true if the specified value is a function. + * @param {?} val Variable to test. + * @return {boolean} Whether variable is a function. + */ +goog.isFunction = function(val) { + return goog.typeOf(val) == 'function'; +}; + + +/** + * Returns true if the specified value is an object. This includes arrays and + * functions. + * @param {?} val Variable to test. + * @return {boolean} Whether variable is an object. + */ +goog.isObject = function(val) { + var type = typeof val; + return type == 'object' && val != null || type == 'function'; + // return Object(val) === val also works, but is slower, especially if val is + // not an object. +}; + + +/** + * Gets a unique ID for an object. This mutates the object so that further calls + * with the same object as a parameter returns the same value. The unique ID is + * guaranteed to be unique across the current session amongst objects that are + * passed into {@code getUid}. There is no guarantee that the ID is unique or + * consistent across sessions. It is unsafe to generate unique ID for function + * prototypes. + * + * @param {Object} obj The object to get the unique ID for. + * @return {number} The unique ID for the object. + */ +goog.getUid = function(obj) { + // TODO(arv): Make the type stricter, do not accept null. + + // In Opera window.hasOwnProperty exists but always returns false so we avoid + // using it. As a consequence the unique ID generated for BaseClass.prototype + // and SubClass.prototype will be the same. + return obj[goog.UID_PROPERTY_] || + (obj[goog.UID_PROPERTY_] = ++goog.uidCounter_); +}; + + +/** + * Whether the given object is already assigned a unique ID. + * + * This does not modify the object. + * + * @param {!Object} obj The object to check. + * @return {boolean} Whether there is an assigned unique id for the object. + */ +goog.hasUid = function(obj) { + return !!obj[goog.UID_PROPERTY_]; +}; + + +/** + * Removes the unique ID from an object. This is useful if the object was + * previously mutated using {@code goog.getUid} in which case the mutation is + * undone. + * @param {Object} obj The object to remove the unique ID field from. + */ +goog.removeUid = function(obj) { + // TODO(arv): Make the type stricter, do not accept null. + + // In IE, DOM nodes are not instances of Object and throw an exception if we + // try to delete. Instead we try to use removeAttribute. + if (obj !== null && 'removeAttribute' in obj) { + obj.removeAttribute(goog.UID_PROPERTY_); + } + /** @preserveTry */ + try { + delete obj[goog.UID_PROPERTY_]; + } catch (ex) { + } +}; + + +/** + * Name for unique ID property. Initialized in a way to help avoid collisions + * with other closure JavaScript on the same page. + * @type {string} + * @private + */ +goog.UID_PROPERTY_ = 'closure_uid_' + ((Math.random() * 1e9) >>> 0); + + +/** + * Counter for UID. + * @type {number} + * @private + */ +goog.uidCounter_ = 0; + + +/** + * Adds a hash code field to an object. The hash code is unique for the + * given object. + * @param {Object} obj The object to get the hash code for. + * @return {number} The hash code for the object. + * @deprecated Use goog.getUid instead. + */ +goog.getHashCode = goog.getUid; + + +/** + * Removes the hash code field from an object. + * @param {Object} obj The object to remove the field from. + * @deprecated Use goog.removeUid instead. + */ +goog.removeHashCode = goog.removeUid; + + +/** + * Clones a value. The input may be an Object, Array, or basic type. Objects and + * arrays will be cloned recursively. + * + * WARNINGS: + * <code>goog.cloneObject</code> does not detect reference loops. Objects that + * refer to themselves will cause infinite recursion. + * + * <code>goog.cloneObject</code> is unaware of unique identifiers, and copies + * UIDs created by <code>getUid</code> into cloned results. + * + * @param {*} obj The value to clone. + * @return {*} A clone of the input value. + * @deprecated goog.cloneObject is unsafe. Prefer the goog.object methods. + */ +goog.cloneObject = function(obj) { + var type = goog.typeOf(obj); + if (type == 'object' || type == 'array') { + if (obj.clone) { + return obj.clone(); + } + var clone = type == 'array' ? [] : {}; + for (var key in obj) { + clone[key] = goog.cloneObject(obj[key]); + } + return clone; + } + + return obj; +}; + + +/** + * A native implementation of goog.bind. + * @param {Function} fn A function to partially apply. + * @param {Object|undefined} selfObj Specifies the object which this should + * point to when the function is run. + * @param {...*} var_args Additional arguments that are partially applied to the + * function. + * @return {!Function} A partially-applied form of the function bind() was + * invoked as a method of. + * @private + * @suppress {deprecated} The compiler thinks that Function.prototype.bind is + * deprecated because some people have declared a pure-JS version. + * Only the pure-JS version is truly deprecated. + */ +goog.bindNative_ = function(fn, selfObj, var_args) { + return /** @type {!Function} */ (fn.call.apply(fn.bind, arguments)); +}; + + +/** + * A pure-JS implementation of goog.bind. + * @param {Function} fn A function to partially apply. + * @param {Object|undefined} selfObj Specifies the object which this should + * point to when the function is run. + * @param {...*} var_args Additional arguments that are partially applied to the + * function. + * @return {!Function} A partially-applied form of the function bind() was + * invoked as a method of. + * @private + */ +goog.bindJs_ = function(fn, selfObj, var_args) { + if (!fn) { + throw new Error(); + } + + if (arguments.length > 2) { + var boundArgs = Array.prototype.slice.call(arguments, 2); + return function() { + // Prepend the bound arguments to the current arguments. + var newArgs = Array.prototype.slice.call(arguments); + Array.prototype.unshift.apply(newArgs, boundArgs); + return fn.apply(selfObj, newArgs); + }; + + } else { + return function() { return fn.apply(selfObj, arguments); }; + } +}; + + +/** + * Partially applies this function to a particular 'this object' and zero or + * more arguments. The result is a new function with some arguments of the first + * function pre-filled and the value of this 'pre-specified'. + * + * Remaining arguments specified at call-time are appended to the pre-specified + * ones. + * + * Also see: {@link #partial}. + * + * Usage: + * <pre>var barMethBound = goog.bind(myFunction, myObj, 'arg1', 'arg2'); + * barMethBound('arg3', 'arg4');</pre> + * + * @param {?function(this:T, ...)} fn A function to partially apply. + * @param {T} selfObj Specifies the object which this should point to when the + * function is run. + * @param {...*} var_args Additional arguments that are partially applied to the + * function. + * @return {!Function} A partially-applied form of the function goog.bind() was + * invoked as a method of. + * @template T + * @suppress {deprecated} See above. + */ +goog.bind = function(fn, selfObj, var_args) { + // TODO(nicksantos): narrow the type signature. + if (Function.prototype.bind && + // NOTE(nicksantos): Somebody pulled base.js into the default Chrome + // extension environment. This means that for Chrome extensions, they get + // the implementation of Function.prototype.bind that calls goog.bind + // instead of the native one. Even worse, we don't want to introduce a + // circular dependency between goog.bind and Function.prototype.bind, so + // we have to hack this to make sure it works correctly. + Function.prototype.bind.toString().indexOf('native code') != -1) { + goog.bind = goog.bindNative_; + } else { + goog.bind = goog.bindJs_; + } + return goog.bind.apply(null, arguments); +}; + + +/** + * Like goog.bind(), except that a 'this object' is not required. Useful when + * the target function is already bound. + * + * Usage: + * var g = goog.partial(f, arg1, arg2); + * g(arg3, arg4); + * + * @param {Function} fn A function to partially apply. + * @param {...*} var_args Additional arguments that are partially applied to fn. + * @return {!Function} A partially-applied form of the function goog.partial() + * was invoked as a method of. + */ +goog.partial = function(fn, var_args) { + var args = Array.prototype.slice.call(arguments, 1); + return function() { + // Clone the array (with slice()) and append additional arguments + // to the existing arguments. + var newArgs = args.slice(); + newArgs.push.apply(newArgs, arguments); + return fn.apply(this, newArgs); + }; +}; + + +/** + * Copies all the members of a source object to a target object. This method + * does not work on all browsers for all objects that contain keys such as + * toString or hasOwnProperty. Use goog.object.extend for this purpose. + * @param {Object} target Target. + * @param {Object} source Source. + */ +goog.mixin = function(target, source) { + for (var x in source) { + target[x] = source[x]; + } + + // For IE7 or lower, the for-in-loop does not contain any properties that are + // not enumerable on the prototype object (for example, isPrototypeOf from + // Object.prototype) but also it will not include 'replace' on objects that + // extend String and change 'replace' (not that it is common for anyone to + // extend anything except Object). +}; + + +/** + * @return {number} An integer value representing the number of milliseconds + * between midnight, January 1, 1970 and the current time. + */ +goog.now = (goog.TRUSTED_SITE && Date.now) || (function() { + // Unary plus operator converts its operand to a number which in + // the case of + // a date is done by calling getTime(). + return +new Date(); + }); + + +/** + * Evals JavaScript in the global scope. In IE this uses execScript, other + * browsers use goog.global.eval. If goog.global.eval does not evaluate in the + * global scope (for example, in Safari), appends a script tag instead. + * Throws an exception if neither execScript or eval is defined. + * @param {string} script JavaScript string. + */ +goog.globalEval = function(script) { + if (goog.global.execScript) { + goog.global.execScript(script, 'JavaScript'); + } else if (goog.global.eval) { + // Test to see if eval works + if (goog.evalWorksForGlobals_ == null) { + goog.global.eval('var _evalTest_ = 1;'); + if (typeof goog.global['_evalTest_'] != 'undefined') { + try { + delete goog.global['_evalTest_']; + } catch (ignore) { + // Microsoft edge fails the deletion above in strict mode. + } + goog.evalWorksForGlobals_ = true; + } else { + goog.evalWorksForGlobals_ = false; + } + } + + if (goog.evalWorksForGlobals_) { + goog.global.eval(script); + } else { + /** @type {Document} */ + var doc = goog.global.document; + var scriptElt = + /** @type {!HTMLScriptElement} */ (doc.createElement('SCRIPT')); + scriptElt.type = 'text/javascript'; + scriptElt.defer = false; + // Note(user): can't use .innerHTML since "t('<test>')" will fail and + // .text doesn't work in Safari 2. Therefore we append a text node. + scriptElt.appendChild(doc.createTextNode(script)); + doc.body.appendChild(scriptElt); + doc.body.removeChild(scriptElt); + } + } else { + throw Error('goog.globalEval not available'); + } +}; + + +/** + * Indicates whether or not we can call 'eval' directly to eval code in the + * global scope. Set to a Boolean by the first call to goog.globalEval (which + * empirically tests whether eval works for globals). @see goog.globalEval + * @type {?boolean} + * @private + */ +goog.evalWorksForGlobals_ = null; + + +/** + * Optional map of CSS class names to obfuscated names used with + * goog.getCssName(). + * @private {!Object<string, string>|undefined} + * @see goog.setCssNameMapping + */ +goog.cssNameMapping_; + + +/** + * Optional obfuscation style for CSS class names. Should be set to either + * 'BY_WHOLE' or 'BY_PART' if defined. + * @type {string|undefined} + * @private + * @see goog.setCssNameMapping + */ +goog.cssNameMappingStyle_; + + +/** + * Handles strings that are intended to be used as CSS class names. + * + * This function works in tandem with @see goog.setCssNameMapping. + * + * Without any mapping set, the arguments are simple joined with a hyphen and + * passed through unaltered. + * + * When there is a mapping, there are two possible styles in which these + * mappings are used. In the BY_PART style, each part (i.e. in between hyphens) + * of the passed in css name is rewritten according to the map. In the BY_WHOLE + * style, the full css name is looked up in the map directly. If a rewrite is + * not specified by the map, the compiler will output a warning. + * + * When the mapping is passed to the compiler, it will replace calls to + * goog.getCssName with the strings from the mapping, e.g. + * var x = goog.getCssName('foo'); + * var y = goog.getCssName(this.baseClass, 'active'); + * becomes: + * var x = 'foo'; + * var y = this.baseClass + '-active'; + * + * If one argument is passed it will be processed, if two are passed only the + * modifier will be processed, as it is assumed the first argument was generated + * as a result of calling goog.getCssName. + * + * @param {string} className The class name. + * @param {string=} opt_modifier A modifier to be appended to the class name. + * @return {string} The class name or the concatenation of the class name and + * the modifier. + */ +goog.getCssName = function(className, opt_modifier) { + var getMapping = function(cssName) { + return goog.cssNameMapping_[cssName] || cssName; + }; + + var renameByParts = function(cssName) { + // Remap all the parts individually. + var parts = cssName.split('-'); + var mapped = []; + for (var i = 0; i < parts.length; i++) { + mapped.push(getMapping(parts[i])); + } + return mapped.join('-'); + }; + + var rename; + if (goog.cssNameMapping_) { + rename = + goog.cssNameMappingStyle_ == 'BY_WHOLE' ? getMapping : renameByParts; + } else { + rename = function(a) { return a; }; + } + + if (opt_modifier) { + return className + '-' + rename(opt_modifier); + } else { + return rename(className); + } +}; + + +/** + * Sets the map to check when returning a value from goog.getCssName(). Example: + * <pre> + * goog.setCssNameMapping({ + * "goog": "a", + * "disabled": "b", + * }); + * + * var x = goog.getCssName('goog'); + * // The following evaluates to: "a a-b". + * goog.getCssName('goog') + ' ' + goog.getCssName(x, 'disabled') + * </pre> + * When declared as a map of string literals to string literals, the JSCompiler + * will replace all calls to goog.getCssName() using the supplied map if the + * --process_closure_primitives flag is set. + * + * @param {!Object} mapping A map of strings to strings where keys are possible + * arguments to goog.getCssName() and values are the corresponding values + * that should be returned. + * @param {string=} opt_style The style of css name mapping. There are two valid + * options: 'BY_PART', and 'BY_WHOLE'. + * @see goog.getCssName for a description. + */ +goog.setCssNameMapping = function(mapping, opt_style) { + goog.cssNameMapping_ = mapping; + goog.cssNameMappingStyle_ = opt_style; +}; + + +/** + * To use CSS renaming in compiled mode, one of the input files should have a + * call to goog.setCssNameMapping() with an object literal that the JSCompiler + * can extract and use to replace all calls to goog.getCssName(). In uncompiled + * mode, JavaScript code should be loaded before this base.js file that declares + * a global variable, CLOSURE_CSS_NAME_MAPPING, which is used below. This is + * to ensure that the mapping is loaded before any calls to goog.getCssName() + * are made in uncompiled mode. + * + * A hook for overriding the CSS name mapping. + * @type {!Object<string, string>|undefined} + */ +goog.global.CLOSURE_CSS_NAME_MAPPING; + + +if (!COMPILED && goog.global.CLOSURE_CSS_NAME_MAPPING) { + // This does not call goog.setCssNameMapping() because the JSCompiler + // requires that goog.setCssNameMapping() be called with an object literal. + goog.cssNameMapping_ = goog.global.CLOSURE_CSS_NAME_MAPPING; +} + + +/** + * Gets a localized message. + * + * This function is a compiler primitive. If you give the compiler a localized + * message bundle, it will replace the string at compile-time with a localized + * version, and expand goog.getMsg call to a concatenated string. + * + * Messages must be initialized in the form: + * <code> + * var MSG_NAME = goog.getMsg('Hello {$placeholder}', {'placeholder': 'world'}); + * </code> + * + * This function produces a string which should be treated as plain text. Use + * {@link goog.html.SafeHtmlFormatter} in conjunction with goog.getMsg to + * produce SafeHtml. + * + * @param {string} str Translatable string, places holders in the form {$foo}. + * @param {Object<string, string>=} opt_values Maps place holder name to value. + * @return {string} message with placeholders filled. + */ +goog.getMsg = function(str, opt_values) { + if (opt_values) { + str = str.replace(/\{\$([^}]+)}/g, function(match, key) { + return (opt_values != null && key in opt_values) ? opt_values[key] : + match; + }); + } + return str; +}; + + +/** + * Gets a localized message. If the message does not have a translation, gives a + * fallback message. + * + * This is useful when introducing a new message that has not yet been + * translated into all languages. + * + * This function is a compiler primitive. Must be used in the form: + * <code>var x = goog.getMsgWithFallback(MSG_A, MSG_B);</code> + * where MSG_A and MSG_B were initialized with goog.getMsg. + * + * @param {string} a The preferred message. + * @param {string} b The fallback message. + * @return {string} The best translated message. + */ +goog.getMsgWithFallback = function(a, b) { + return a; +}; + + +/** + * Exposes an unobfuscated global namespace path for the given object. + * Note that fields of the exported object *will* be obfuscated, unless they are + * exported in turn via this function or goog.exportProperty. + * + * Also handy for making public items that are defined in anonymous closures. + * + * ex. goog.exportSymbol('public.path.Foo', Foo); + * + * ex. goog.exportSymbol('public.path.Foo.staticFunction', Foo.staticFunction); + * public.path.Foo.staticFunction(); + * + * ex. goog.exportSymbol('public.path.Foo.prototype.myMethod', + * Foo.prototype.myMethod); + * new public.path.Foo().myMethod(); + * + * @param {string} publicPath Unobfuscated name to export. + * @param {*} object Object the name should point to. + * @param {Object=} opt_objectToExportTo The object to add the path to; default + * is goog.global. + */ +goog.exportSymbol = function(publicPath, object, opt_objectToExportTo) { + goog.exportPath_(publicPath, object, opt_objectToExportTo); +}; + + +/** + * Exports a property unobfuscated into the object's namespace. + * ex. goog.exportProperty(Foo, 'staticFunction', Foo.staticFunction); + * ex. goog.exportProperty(Foo.prototype, 'myMethod', Foo.prototype.myMethod); + * @param {Object} object Object whose static property is being exported. + * @param {string} publicName Unobfuscated name to export. + * @param {*} symbol Object the name should point to. + */ +goog.exportProperty = function(object, publicName, symbol) { + object[publicName] = symbol; +}; + + +/** + * Inherit the prototype methods from one constructor into another. + * + * Usage: + * <pre> + * function ParentClass(a, b) { } + * ParentClass.prototype.foo = function(a) { }; + * + * function ChildClass(a, b, c) { + * ChildClass.base(this, 'constructor', a, b); + * } + * goog.inherits(ChildClass, ParentClass); + * + * var child = new ChildClass('a', 'b', 'see'); + * child.foo(); // This works. + * </pre> + * + * @param {!Function} childCtor Child class. + * @param {!Function} parentCtor Parent class. + */ +goog.inherits = function(childCtor, parentCtor) { + /** @constructor */ + function tempCtor() {} + tempCtor.prototype = parentCtor.prototype; + childCtor.superClass_ = parentCtor.prototype; + childCtor.prototype = new tempCtor(); + /** @override */ + childCtor.prototype.constructor = childCtor; + + /** + * Calls superclass constructor/method. + * + * This function is only available if you use goog.inherits to + * express inheritance relationships between classes. + * + * NOTE: This is a replacement for goog.base and for superClass_ + * property defined in childCtor. + * + * @param {!Object} me Should always be "this". + * @param {string} methodName The method name to call. Calling + * superclass constructor can be done with the special string + * 'constructor'. + * @param {...*} var_args The arguments to pass to superclass + * method/constructor. + * @return {*} The return value of the superclass method/constructor. + */ + childCtor.base = function(me, methodName, var_args) { + // Copying using loop to avoid deop due to passing arguments object to + // function. This is faster in many JS engines as of late 2014. + var args = new Array(arguments.length - 2); + for (var i = 2; i < arguments.length; i++) { + args[i - 2] = arguments[i]; + } + return parentCtor.prototype[methodName].apply(me, args); + }; +}; + + +/** + * Call up to the superclass. + * + * If this is called from a constructor, then this calls the superclass + * constructor with arguments 1-N. + * + * If this is called from a prototype method, then you must pass the name of the + * method as the second argument to this function. If you do not, you will get a + * runtime error. This calls the superclass' method with arguments 2-N. + * + * This function only works if you use goog.inherits to express inheritance + * relationships between your classes. + * + * This function is a compiler primitive. At compile-time, the compiler will do + * macro expansion to remove a lot of the extra overhead that this function + * introduces. The compiler will also enforce a lot of the assumptions that this + * function makes, and treat it as a compiler error if you break them. + * + * @param {!Object} me Should always be "this". + * @param {*=} opt_methodName The method name if calling a super method. + * @param {...*} var_args The rest of the arguments. + * @return {*} The return value of the superclass method. + * @suppress {es5Strict} This method can not be used in strict mode, but + * all Closure Library consumers must depend on this file. + */ +goog.base = function(me, opt_methodName, var_args) { + var caller = arguments.callee.caller; + + if (goog.STRICT_MODE_COMPATIBLE || (goog.DEBUG && !caller)) { + throw Error( + 'arguments.caller not defined. goog.base() cannot be used ' + + 'with strict mode code. See ' + + 'http://www.ecma-international.org/ecma-262/5.1/#sec-C'); + } + + if (caller.superClass_) { + // Copying using loop to avoid deop due to passing arguments object to + // function. This is faster in many JS engines as of late 2014. + var ctorArgs = new Array(arguments.length - 1); + for (var i = 1; i < arguments.length; i++) { + ctorArgs[i - 1] = arguments[i]; + } + // This is a constructor. Call the superclass constructor. + return caller.superClass_.constructor.apply(me, ctorArgs); + } + + // Copying using loop to avoid deop due to passing arguments object to + // function. This is faster in many JS engines as of late 2014. + var args = new Array(arguments.length - 2); + for (var i = 2; i < arguments.length; i++) { + args[i - 2] = arguments[i]; + } + var foundCaller = false; + for (var ctor = me.constructor; ctor; + ctor = ctor.superClass_ && ctor.superClass_.constructor) { + if (ctor.prototype[opt_methodName] === caller) { + foundCaller = true; + } else if (foundCaller) { + return ctor.prototype[opt_methodName].apply(me, args); + } + } + + // If we did not find the caller in the prototype chain, then one of two + // things happened: + // 1) The caller is an instance method. + // 2) This method was not called by the right caller. + if (me[opt_methodName] === caller) { + return me.constructor.prototype[opt_methodName].apply(me, args); + } else { + throw Error( + 'goog.base called from a method of one name ' + + 'to a method of a different name'); + } +}; + + +/** + * Allow for aliasing within scope functions. This function exists for + * uncompiled code - in compiled code the calls will be inlined and the aliases + * applied. In uncompiled code the function is simply run since the aliases as + * written are valid JavaScript. + * + * + * @param {function()} fn Function to call. This function can contain aliases + * to namespaces (e.g. "var dom = goog.dom") or classes + * (e.g. "var Timer = goog.Timer"). + */ +goog.scope = function(fn) { + if (goog.isInModuleLoader_()) { + throw Error('goog.scope is not supported within a goog.module.'); + } + fn.call(goog.global); +}; + + +/* + * To support uncompiled, strict mode bundles that use eval to divide source + * like so: + * eval('someSource;//# sourceUrl sourcefile.js'); + * We need to export the globally defined symbols "goog" and "COMPILED". + * Exporting "goog" breaks the compiler optimizations, so we required that + * be defined externally. + * NOTE: We don't use goog.exportSymbol here because we don't want to trigger + * extern generation when that compiler option is enabled. + */ +if (!COMPILED) { + goog.global['COMPILED'] = COMPILED; +} + + +//============================================================================== +// goog.defineClass implementation +//============================================================================== + + +/** + * Creates a restricted form of a Closure "class": + * - from the compiler's perspective, the instance returned from the + * constructor is sealed (no new properties may be added). This enables + * better checks. + * - the compiler will rewrite this definition to a form that is optimal + * for type checking and optimization (initially this will be a more + * traditional form). + * + * @param {Function} superClass The superclass, Object or null. + * @param {goog.defineClass.ClassDescriptor} def + * An object literal describing + * the class. It may have the following properties: + * "constructor": the constructor function + * "statics": an object literal containing methods to add to the constructor + * as "static" methods or a function that will receive the constructor + * function as its only parameter to which static properties can + * be added. + * all other properties are added to the prototype. + * @return {!Function} The class constructor. + */ +goog.defineClass = function(superClass, def) { + // TODO(johnlenz): consider making the superClass an optional parameter. + var constructor = def.constructor; + var statics = def.statics; + // Wrap the constructor prior to setting up the prototype and static methods. + if (!constructor || constructor == Object.prototype.constructor) { + constructor = function() { + throw Error('cannot instantiate an interface (no constructor defined).'); + }; + } + + var cls = goog.defineClass.createSealingConstructor_(constructor, superClass); + if (superClass) { + goog.inherits(cls, superClass); + } + + // Remove all the properties that should not be copied to the prototype. + delete def.constructor; + delete def.statics; + + goog.defineClass.applyProperties_(cls.prototype, def); + if (statics != null) { + if (statics instanceof Function) { + statics(cls); + } else { + goog.defineClass.applyProperties_(cls, statics); + } + } + + return cls; +}; + + +/** + * @typedef {{ + * constructor: (!Function|undefined), + * statics: (Object|undefined|function(Function):void) + * }} + * @suppress {missingProvide} + */ +goog.defineClass.ClassDescriptor; + + +/** + * @define {boolean} Whether the instances returned by goog.defineClass should + * be sealed when possible. + * + * When sealing is disabled the constructor function will not be wrapped by + * goog.defineClass, making it incompatible with ES6 class methods. + */ +goog.define('goog.defineClass.SEAL_CLASS_INSTANCES', goog.DEBUG); + + +/** + * If goog.defineClass.SEAL_CLASS_INSTANCES is enabled and Object.seal is + * defined, this function will wrap the constructor in a function that seals the + * results of the provided constructor function. + * + * @param {!Function} ctr The constructor whose results maybe be sealed. + * @param {Function} superClass The superclass constructor. + * @return {!Function} The replacement constructor. + * @private + */ +goog.defineClass.createSealingConstructor_ = function(ctr, superClass) { + if (!goog.defineClass.SEAL_CLASS_INSTANCES) { + // Do now wrap the constructor when sealing is disabled. Angular code + // depends on this for injection to work properly. + return ctr; + } + + // Compute whether the constructor is sealable at definition time, rather + // than when the instance is being constructed. + var superclassSealable = !goog.defineClass.isUnsealable_(superClass); + + /** + * @this {Object} + * @return {?} + */ + var wrappedCtr = function() { + // Don't seal an instance of a subclass when it calls the constructor of + // its super class as there is most likely still setup to do. + var instance = ctr.apply(this, arguments) || this; + instance[goog.UID_PROPERTY_] = instance[goog.UID_PROPERTY_]; + + if (this.constructor === wrappedCtr && superclassSealable && + Object.seal instanceof Function) { + Object.seal(instance); + } + return instance; + }; + + return wrappedCtr; +}; + + +/** + * @param {Function} ctr The constructor to test. + * @returns {boolean} Whether the constructor has been tagged as unsealable + * using goog.tagUnsealableClass. + * @private + */ +goog.defineClass.isUnsealable_ = function(ctr) { + return ctr && ctr.prototype && + ctr.prototype[goog.UNSEALABLE_CONSTRUCTOR_PROPERTY_]; +}; + + +// TODO(johnlenz): share these values with the goog.object +/** + * The names of the fields that are defined on Object.prototype. + * @type {!Array<string>} + * @private + * @const + */ +goog.defineClass.OBJECT_PROTOTYPE_FIELDS_ = [ + 'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable', + 'toLocaleString', 'toString', 'valueOf' +]; + + +// TODO(johnlenz): share this function with the goog.object +/** + * @param {!Object} target The object to add properties to. + * @param {!Object} source The object to copy properties from. + * @private + */ +goog.defineClass.applyProperties_ = function(target, source) { + // TODO(johnlenz): update this to support ES5 getters/setters + + var key; + for (key in source) { + if (Object.prototype.hasOwnProperty.call(source, key)) { + target[key] = source[key]; + } + } + + // For IE the for-in-loop does not contain any properties that are not + // enumerable on the prototype object (for example isPrototypeOf from + // Object.prototype) and it will also not include 'replace' on objects that + // extend String and change 'replace' (not that it is common for anyone to + // extend anything except Object). + for (var i = 0; i < goog.defineClass.OBJECT_PROTOTYPE_FIELDS_.length; i++) { + key = goog.defineClass.OBJECT_PROTOTYPE_FIELDS_[i]; + if (Object.prototype.hasOwnProperty.call(source, key)) { + target[key] = source[key]; + } + } +}; + + +/** + * Sealing classes breaks the older idiom of assigning properties on the + * prototype rather than in the constructor. As such, goog.defineClass + * must not seal subclasses of these old-style classes until they are fixed. + * Until then, this marks a class as "broken", instructing defineClass + * not to seal subclasses. + * @param {!Function} ctr The legacy constructor to tag as unsealable. + */ +goog.tagUnsealableClass = function(ctr) { + if (!COMPILED && goog.defineClass.SEAL_CLASS_INSTANCES) { + ctr.prototype[goog.UNSEALABLE_CONSTRUCTOR_PROPERTY_] = true; + } +}; + + +/** + * Name for unsealable tag property. + * @const @private {string} + */ +goog.UNSEALABLE_CONSTRUCTOR_PROPERTY_ = 'goog_defineClass_legacy_unsealable'; |