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-// 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 Utilities for manipulating objects/maps/hashes.
- * @author arv@google.com (Erik Arvidsson)
- */
-
-goog.provide('goog.object');
-
-
-/**
- * Whether two values are not observably distinguishable. This
- * correctly detects that 0 is not the same as -0 and two NaNs are
- * practically equivalent.
- *
- * The implementation is as suggested by harmony:egal proposal.
- *
- * @param {*} v The first value to compare.
- * @param {*} v2 The second value to compare.
- * @return {boolean} Whether two values are not observably distinguishable.
- * @see http://wiki.ecmascript.org/doku.php?id=harmony:egal
- */
-goog.object.is = function(v, v2) {
- if (v === v2) {
- // 0 === -0, but they are not identical.
- // We need the cast because the compiler requires that v2 is a
- // number (although 1/v2 works with non-number). We cast to ? to
- // stop the compiler from type-checking this statement.
- return v !== 0 || 1 / v === 1 / /** @type {?} */ (v2);
- }
-
- // NaN is non-reflexive: NaN !== NaN, although they are identical.
- return v !== v && v2 !== v2;
-};
-
-
-/**
- * Calls a function for each element in an object/map/hash.
- *
- * @param {Object<K,V>} obj The object over which to iterate.
- * @param {function(this:T,V,?,Object<K,V>):?} f The function to call
- * for every element. This function takes 3 arguments (the value, the
- * key and the object) and the return value is ignored.
- * @param {T=} opt_obj This is used as the 'this' object within f.
- * @template T,K,V
- */
-goog.object.forEach = function(obj, f, opt_obj) {
- for (var key in obj) {
- f.call(/** @type {?} */ (opt_obj), obj[key], key, obj);
- }
-};
-
-
-/**
- * Calls a function for each element in an object/map/hash. If that call returns
- * true, adds the element to a new object.
- *
- * @param {Object<K,V>} obj The object over which to iterate.
- * @param {function(this:T,V,?,Object<K,V>):boolean} f The function to call
- * for every element. This
- * function takes 3 arguments (the value, the key and the object)
- * and should return a boolean. If the return value is true the
- * element is added to the result object. If it is false the
- * element is not included.
- * @param {T=} opt_obj This is used as the 'this' object within f.
- * @return {!Object<K,V>} a new object in which only elements that passed the
- * test are present.
- * @template T,K,V
- */
-goog.object.filter = function(obj, f, opt_obj) {
- var res = {};
- for (var key in obj) {
- if (f.call(/** @type {?} */ (opt_obj), obj[key], key, obj)) {
- res[key] = obj[key];
- }
- }
- return res;
-};
-
-
-/**
- * For every element in an object/map/hash calls a function and inserts the
- * result into a new object.
- *
- * @param {Object<K,V>} obj The object over which to iterate.
- * @param {function(this:T,V,?,Object<K,V>):R} f The function to call
- * for every element. This function
- * takes 3 arguments (the value, the key and the object)
- * and should return something. The result will be inserted
- * into a new object.
- * @param {T=} opt_obj This is used as the 'this' object within f.
- * @return {!Object<K,R>} a new object with the results from f.
- * @template T,K,V,R
- */
-goog.object.map = function(obj, f, opt_obj) {
- var res = {};
- for (var key in obj) {
- res[key] = f.call(/** @type {?} */ (opt_obj), obj[key], key, obj);
- }
- return res;
-};
-
-
-/**
- * Calls a function for each element in an object/map/hash. If any
- * call returns true, returns true (without checking the rest). If
- * all calls return false, returns false.
- *
- * @param {Object<K,V>} obj The object to check.
- * @param {function(this:T,V,?,Object<K,V>):boolean} f The function to
- * call for every element. This function
- * takes 3 arguments (the value, the key and the object) and should
- * return a boolean.
- * @param {T=} opt_obj This is used as the 'this' object within f.
- * @return {boolean} true if any element passes the test.
- * @template T,K,V
- */
-goog.object.some = function(obj, f, opt_obj) {
- for (var key in obj) {
- if (f.call(/** @type {?} */ (opt_obj), obj[key], key, obj)) {
- return true;
- }
- }
- return false;
-};
-
-
-/**
- * Calls a function for each element in an object/map/hash. If
- * all calls return true, returns true. If any call returns false, returns
- * false at this point and does not continue to check the remaining elements.
- *
- * @param {Object<K,V>} obj The object to check.
- * @param {?function(this:T,V,?,Object<K,V>):boolean} f The function to
- * call for every element. This function
- * takes 3 arguments (the value, the key and the object) and should
- * return a boolean.
- * @param {T=} opt_obj This is used as the 'this' object within f.
- * @return {boolean} false if any element fails the test.
- * @template T,K,V
- */
-goog.object.every = function(obj, f, opt_obj) {
- for (var key in obj) {
- if (!f.call(/** @type {?} */ (opt_obj), obj[key], key, obj)) {
- return false;
- }
- }
- return true;
-};
-
-
-/**
- * Returns the number of key-value pairs in the object map.
- *
- * @param {Object} obj The object for which to get the number of key-value
- * pairs.
- * @return {number} The number of key-value pairs in the object map.
- */
-goog.object.getCount = function(obj) {
- var rv = 0;
- for (var key in obj) {
- rv++;
- }
- return rv;
-};
-
-
-/**
- * Returns one key from the object map, if any exists.
- * For map literals the returned key will be the first one in most of the
- * browsers (a know exception is Konqueror).
- *
- * @param {Object} obj The object to pick a key from.
- * @return {string|undefined} The key or undefined if the object is empty.
- */
-goog.object.getAnyKey = function(obj) {
- for (var key in obj) {
- return key;
- }
-};
-
-
-/**
- * Returns one value from the object map, if any exists.
- * For map literals the returned value will be the first one in most of the
- * browsers (a know exception is Konqueror).
- *
- * @param {Object<K,V>} obj The object to pick a value from.
- * @return {V|undefined} The value or undefined if the object is empty.
- * @template K,V
- */
-goog.object.getAnyValue = function(obj) {
- for (var key in obj) {
- return obj[key];
- }
-};
-
-
-/**
- * Whether the object/hash/map contains the given object as a value.
- * An alias for goog.object.containsValue(obj, val).
- *
- * @param {Object<K,V>} obj The object in which to look for val.
- * @param {V} val The object for which to check.
- * @return {boolean} true if val is present.
- * @template K,V
- */
-goog.object.contains = function(obj, val) {
- return goog.object.containsValue(obj, val);
-};
-
-
-/**
- * Returns the values of the object/map/hash.
- *
- * @param {Object<K,V>} obj The object from which to get the values.
- * @return {!Array<V>} The values in the object/map/hash.
- * @template K,V
- */
-goog.object.getValues = function(obj) {
- var res = [];
- var i = 0;
- for (var key in obj) {
- res[i++] = obj[key];
- }
- return res;
-};
-
-
-/**
- * Returns the keys of the object/map/hash.
- *
- * @param {Object} obj The object from which to get the keys.
- * @return {!Array<string>} Array of property keys.
- */
-goog.object.getKeys = function(obj) {
- var res = [];
- var i = 0;
- for (var key in obj) {
- res[i++] = key;
- }
- return res;
-};
-
-
-/**
- * Get a value from an object multiple levels deep. This is useful for
- * pulling values from deeply nested objects, such as JSON responses.
- * Example usage: getValueByKeys(jsonObj, 'foo', 'entries', 3)
- *
- * @param {!Object} obj An object to get the value from. Can be array-like.
- * @param {...(string|number|!IArrayLike<number|string>)}
- * var_args A number of keys
- * (as strings, or numbers, for array-like objects). Can also be
- * specified as a single array of keys.
- * @return {*} The resulting value. If, at any point, the value for a key
- * is undefined, returns undefined.
- */
-goog.object.getValueByKeys = function(obj, var_args) {
- var isArrayLike = goog.isArrayLike(var_args);
- var keys = isArrayLike ? var_args : arguments;
-
- // Start with the 2nd parameter for the variable parameters syntax.
- for (var i = isArrayLike ? 0 : 1; i < keys.length; i++) {
- obj = obj[keys[i]];
- if (!goog.isDef(obj)) {
- break;
- }
- }
-
- return obj;
-};
-
-
-/**
- * Whether the object/map/hash contains the given key.
- *
- * @param {Object} obj The object in which to look for key.
- * @param {?} key The key for which to check.
- * @return {boolean} true If the map contains the key.
- */
-goog.object.containsKey = function(obj, key) {
- return obj !== null && key in obj;
-};
-
-
-/**
- * Whether the object/map/hash contains the given value. This is O(n).
- *
- * @param {Object<K,V>} obj The object in which to look for val.
- * @param {V} val The value for which to check.
- * @return {boolean} true If the map contains the value.
- * @template K,V
- */
-goog.object.containsValue = function(obj, val) {
- for (var key in obj) {
- if (obj[key] == val) {
- return true;
- }
- }
- return false;
-};
-
-
-/**
- * Searches an object for an element that satisfies the given condition and
- * returns its key.
- * @param {Object<K,V>} obj The object to search in.
- * @param {function(this:T,V,string,Object<K,V>):boolean} f The
- * function to call for every element. Takes 3 arguments (the value,
- * the key and the object) and should return a boolean.
- * @param {T=} opt_this An optional "this" context for the function.
- * @return {string|undefined} The key of an element for which the function
- * returns true or undefined if no such element is found.
- * @template T,K,V
- */
-goog.object.findKey = function(obj, f, opt_this) {
- for (var key in obj) {
- if (f.call(/** @type {?} */ (opt_this), obj[key], key, obj)) {
- return key;
- }
- }
- return undefined;
-};
-
-
-/**
- * Searches an object for an element that satisfies the given condition and
- * returns its value.
- * @param {Object<K,V>} obj The object to search in.
- * @param {function(this:T,V,string,Object<K,V>):boolean} f The function
- * to call for every element. Takes 3 arguments (the value, the key
- * and the object) and should return a boolean.
- * @param {T=} opt_this An optional "this" context for the function.
- * @return {V} The value of an element for which the function returns true or
- * undefined if no such element is found.
- * @template T,K,V
- */
-goog.object.findValue = function(obj, f, opt_this) {
- var key = goog.object.findKey(obj, f, opt_this);
- return key && obj[key];
-};
-
-
-/**
- * Whether the object/map/hash is empty.
- *
- * @param {Object} obj The object to test.
- * @return {boolean} true if obj is empty.
- */
-goog.object.isEmpty = function(obj) {
- for (var key in obj) {
- return false;
- }
- return true;
-};
-
-
-/**
- * Removes all key value pairs from the object/map/hash.
- *
- * @param {Object} obj The object to clear.
- */
-goog.object.clear = function(obj) {
- for (var i in obj) {
- delete obj[i];
- }
-};
-
-
-/**
- * Removes a key-value pair based on the key.
- *
- * @param {Object} obj The object from which to remove the key.
- * @param {?} key The key to remove.
- * @return {boolean} Whether an element was removed.
- */
-goog.object.remove = function(obj, key) {
- var rv;
- if (rv = key in /** @type {!Object} */ (obj)) {
- delete obj[key];
- }
- return rv;
-};
-
-
-/**
- * Adds a key-value pair to the object. Throws an exception if the key is
- * already in use. Use set if you want to change an existing pair.
- *
- * @param {Object<K,V>} obj The object to which to add the key-value pair.
- * @param {string} key The key to add.
- * @param {V} val The value to add.
- * @template K,V
- */
-goog.object.add = function(obj, key, val) {
- if (obj !== null && key in obj) {
- throw Error('The object already contains the key "' + key + '"');
- }
- goog.object.set(obj, key, val);
-};
-
-
-/**
- * Returns the value for the given key.
- *
- * @param {Object<K,V>} obj The object from which to get the value.
- * @param {string} key The key for which to get the value.
- * @param {R=} opt_val The value to return if no item is found for the given
- * key (default is undefined).
- * @return {V|R|undefined} The value for the given key.
- * @template K,V,R
- */
-goog.object.get = function(obj, key, opt_val) {
- if (obj !== null && key in obj) {
- return obj[key];
- }
- return opt_val;
-};
-
-
-/**
- * Adds a key-value pair to the object/map/hash.
- *
- * @param {Object<K,V>} obj The object to which to add the key-value pair.
- * @param {string} key The key to add.
- * @param {V} value The value to add.
- * @template K,V
- */
-goog.object.set = function(obj, key, value) {
- obj[key] = value;
-};
-
-
-/**
- * Adds a key-value pair to the object/map/hash if it doesn't exist yet.
- *
- * @param {Object<K,V>} obj The object to which to add the key-value pair.
- * @param {string} key The key to add.
- * @param {V} value The value to add if the key wasn't present.
- * @return {V} The value of the entry at the end of the function.
- * @template K,V
- */
-goog.object.setIfUndefined = function(obj, key, value) {
- return key in /** @type {!Object} */ (obj) ? obj[key] : (obj[key] = value);
-};
-
-
-/**
- * Sets a key and value to an object if the key is not set. The value will be
- * the return value of the given function. If the key already exists, the
- * object will not be changed and the function will not be called (the function
- * will be lazily evaluated -- only called if necessary).
- *
- * This function is particularly useful for use with a map used a as a cache.
- *
- * @param {!Object<K,V>} obj The object to which to add the key-value pair.
- * @param {string} key The key to add.
- * @param {function():V} f The value to add if the key wasn't present.
- * @return {V} The value of the entry at the end of the function.
- * @template K,V
- */
-goog.object.setWithReturnValueIfNotSet = function(obj, key, f) {
- if (key in obj) {
- return obj[key];
- }
-
- var val = f();
- obj[key] = val;
- return val;
-};
-
-
-/**
- * Compares two objects for equality using === on the values.
- *
- * @param {!Object<K,V>} a
- * @param {!Object<K,V>} b
- * @return {boolean}
- * @template K,V
- */
-goog.object.equals = function(a, b) {
- for (var k in a) {
- if (!(k in b) || a[k] !== b[k]) {
- return false;
- }
- }
- for (var k in b) {
- if (!(k in a)) {
- return false;
- }
- }
- return true;
-};
-
-
-/**
- * Returns a shallow clone of the object.
- *
- * @param {Object<K,V>} obj Object to clone.
- * @return {!Object<K,V>} Clone of the input object.
- * @template K,V
- */
-goog.object.clone = function(obj) {
- // We cannot use the prototype trick because a lot of methods depend on where
- // the actual key is set.
-
- var res = {};
- for (var key in obj) {
- res[key] = obj[key];
- }
- return res;
- // We could also use goog.mixin but I wanted this to be independent from that.
-};
-
-
-/**
- * Clones a value. The input may be an Object, Array, or basic type. Objects and
- * arrays will be cloned recursively.
- *
- * WARNINGS:
- * <code>goog.object.unsafeClone</code> does not detect reference loops. Objects
- * that refer to themselves will cause infinite recursion.
- *
- * <code>goog.object.unsafeClone</code> is unaware of unique identifiers, and
- * copies UIDs created by <code>getUid</code> into cloned results.
- *
- * @param {T} obj The value to clone.
- * @return {T} A clone of the input value.
- * @template T
- */
-goog.object.unsafeClone = function(obj) {
- var type = goog.typeOf(obj);
- if (type == 'object' || type == 'array') {
- if (goog.isFunction(obj.clone)) {
- return obj.clone();
- }
- var clone = type == 'array' ? [] : {};
- for (var key in obj) {
- clone[key] = goog.object.unsafeClone(obj[key]);
- }
- return clone;
- }
-
- return obj;
-};
-
-
-/**
- * Returns a new object in which all the keys and values are interchanged
- * (keys become values and values become keys). If multiple keys map to the
- * same value, the chosen transposed value is implementation-dependent.
- *
- * @param {Object} obj The object to transpose.
- * @return {!Object} The transposed object.
- */
-goog.object.transpose = function(obj) {
- var transposed = {};
- for (var key in obj) {
- transposed[obj[key]] = key;
- }
- return transposed;
-};
-
-
-/**
- * The names of the fields that are defined on Object.prototype.
- * @type {Array<string>}
- * @private
- */
-goog.object.PROTOTYPE_FIELDS_ = [
- 'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable',
- 'toLocaleString', 'toString', 'valueOf'
-];
-
-
-/**
- * Extends an object with another object.
- * This operates 'in-place'; it does not create a new Object.
- *
- * Example:
- * var o = {};
- * goog.object.extend(o, {a: 0, b: 1});
- * o; // {a: 0, b: 1}
- * goog.object.extend(o, {b: 2, c: 3});
- * o; // {a: 0, b: 2, c: 3}
- *
- * @param {Object} target The object to modify. Existing properties will be
- * overwritten if they are also present in one of the objects in
- * {@code var_args}.
- * @param {...Object} var_args The objects from which values will be copied.
- */
-goog.object.extend = function(target, var_args) {
- var key, source;
- for (var i = 1; i < arguments.length; i++) {
- source = arguments[i];
- for (key in source) {
- 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 j = 0; j < goog.object.PROTOTYPE_FIELDS_.length; j++) {
- key = goog.object.PROTOTYPE_FIELDS_[j];
- if (Object.prototype.hasOwnProperty.call(source, key)) {
- target[key] = source[key];
- }
- }
- }
-};
-
-
-/**
- * Creates a new object built from the key-value pairs provided as arguments.
- * @param {...*} var_args If only one argument is provided and it is an array
- * then this is used as the arguments, otherwise even arguments are used as
- * the property names and odd arguments are used as the property values.
- * @return {!Object} The new object.
- * @throws {Error} If there are uneven number of arguments or there is only one
- * non array argument.
- */
-goog.object.create = function(var_args) {
- var argLength = arguments.length;
- if (argLength == 1 && goog.isArray(arguments[0])) {
- return goog.object.create.apply(null, arguments[0]);
- }
-
- if (argLength % 2) {
- throw Error('Uneven number of arguments');
- }
-
- var rv = {};
- for (var i = 0; i < argLength; i += 2) {
- rv[arguments[i]] = arguments[i + 1];
- }
- return rv;
-};
-
-
-/**
- * Creates a new object where the property names come from the arguments but
- * the value is always set to true
- * @param {...*} var_args If only one argument is provided and it is an array
- * then this is used as the arguments, otherwise the arguments are used
- * as the property names.
- * @return {!Object} The new object.
- */
-goog.object.createSet = function(var_args) {
- var argLength = arguments.length;
- if (argLength == 1 && goog.isArray(arguments[0])) {
- return goog.object.createSet.apply(null, arguments[0]);
- }
-
- var rv = {};
- for (var i = 0; i < argLength; i++) {
- rv[arguments[i]] = true;
- }
- return rv;
-};
-
-
-/**
- * Creates an immutable view of the underlying object, if the browser
- * supports immutable objects.
- *
- * In default mode, writes to this view will fail silently. In strict mode,
- * they will throw an error.
- *
- * @param {!Object<K,V>} obj An object.
- * @return {!Object<K,V>} An immutable view of that object, or the
- * original object if this browser does not support immutables.
- * @template K,V
- */
-goog.object.createImmutableView = function(obj) {
- var result = obj;
- if (Object.isFrozen && !Object.isFrozen(obj)) {
- result = Object.create(obj);
- Object.freeze(result);
- }
- return result;
-};
-
-
-/**
- * @param {!Object} obj An object.
- * @return {boolean} Whether this is an immutable view of the object.
- */
-goog.object.isImmutableView = function(obj) {
- return !!Object.isFrozen && Object.isFrozen(obj);
-};
-
-
-/**
- * Get all properties names on a given Object regardless of enumerability.
- *
- * <p> If the browser does not support {@code Object.getOwnPropertyNames} nor
- * {@code Object.getPrototypeOf} then this is equivalent to using {@code
- * goog.object.getKeys}
- *
- * @param {?Object} obj The object to get the properties of.
- * @param {boolean=} opt_includeObjectPrototype Whether properties defined on
- * {@code Object.prototype} should be included in the result.
- * @param {boolean=} opt_includeFunctionPrototype Whether properties defined on
- * {@code Function.prototype} should be included in the result.
- * @return {!Array<string>}
- * @public
- */
-goog.object.getAllPropertyNames = function(
- obj, opt_includeObjectPrototype, opt_includeFunctionPrototype) {
- if (!obj) {
- return [];
- }
-
- // Naively use a for..in loop to get the property names if the browser doesn't
- // support any other APIs for getting it.
- if (!Object.getOwnPropertyNames || !Object.getPrototypeOf) {
- return goog.object.getKeys(obj);
- }
-
- var visitedSet = {};
-
- // Traverse the prototype chain and add all properties to the visited set.
- var proto = obj;
- while (proto &&
- (proto !== Object.prototype || !!opt_includeObjectPrototype) &&
- (proto !== Function.prototype || !!opt_includeFunctionPrototype)) {
- var names = Object.getOwnPropertyNames(proto);
- for (var i = 0; i < names.length; i++) {
- visitedSet[names[i]] = true;
- }
- proto = Object.getPrototypeOf(proto);
- }
-
- return goog.object.getKeys(visitedSet);
-};

Please direct all issues, questions, and patches to me@mediocregopher.com.

Check mediocregopher.com for periodic updates about projects I'm working on.