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+// Copyright 2008 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 creating functions. Loosely inspired by the
+ * java classes: http://goo.gl/GM0Hmu and http://goo.gl/6k7nI8.
+ *
+ * @author nicksantos@google.com (Nick Santos)
+ */
+
+
+goog.provide('goog.functions');
+
+
+/**
+ * Creates a function that always returns the same value.
+ * @param {T} retValue The value to return.
+ * @return {function():T} The new function.
+ * @template T
+ */
+goog.functions.constant = function(retValue) {
+  return function() { return retValue; };
+};
+
+
+/**
+ * Always returns false.
+ * @type {function(...): boolean}
+ */
+goog.functions.FALSE = goog.functions.constant(false);
+
+
+/**
+ * Always returns true.
+ * @type {function(...): boolean}
+ */
+goog.functions.TRUE = goog.functions.constant(true);
+
+
+/**
+ * Always returns NULL.
+ * @type {function(...): null}
+ */
+goog.functions.NULL = goog.functions.constant(null);
+
+
+/**
+ * A simple function that returns the first argument of whatever is passed
+ * into it.
+ * @param {T=} opt_returnValue The single value that will be returned.
+ * @param {...*} var_args Optional trailing arguments. These are ignored.
+ * @return {T} The first argument passed in, or undefined if nothing was passed.
+ * @template T
+ */
+goog.functions.identity = function(opt_returnValue, var_args) {
+  return opt_returnValue;
+};
+
+
+/**
+ * Creates a function that always throws an error with the given message.
+ * @param {string} message The error message.
+ * @return {!Function} The error-throwing function.
+ */
+goog.functions.error = function(message) {
+  return function() { throw Error(message); };
+};
+
+
+/**
+ * Creates a function that throws the given object.
+ * @param {*} err An object to be thrown.
+ * @return {!Function} The error-throwing function.
+ */
+goog.functions.fail = function(err) {
+  return function() { throw err; };
+};
+
+
+/**
+ * Given a function, create a function that keeps opt_numArgs arguments and
+ * silently discards all additional arguments.
+ * @param {Function} f The original function.
+ * @param {number=} opt_numArgs The number of arguments to keep. Defaults to 0.
+ * @return {!Function} A version of f that only keeps the first opt_numArgs
+ *     arguments.
+ */
+goog.functions.lock = function(f, opt_numArgs) {
+  opt_numArgs = opt_numArgs || 0;
+  return function() {
+    return f.apply(this, Array.prototype.slice.call(arguments, 0, opt_numArgs));
+  };
+};
+
+
+/**
+ * Creates a function that returns its nth argument.
+ * @param {number} n The position of the return argument.
+ * @return {!Function} A new function.
+ */
+goog.functions.nth = function(n) {
+  return function() { return arguments[n]; };
+};
+
+
+/**
+ * Like goog.partial(), except that arguments are added after arguments to the
+ * returned function.
+ *
+ * Usage:
+ * function f(arg1, arg2, arg3, arg4) { ... }
+ * var g = goog.functions.partialRight(f, arg3, arg4);
+ * g(arg1, arg2);
+ *
+ * @param {!Function} fn A function to partially apply.
+ * @param {...*} var_args Additional arguments that are partially applied to fn
+ *     at the end.
+ * @return {!Function} A partially-applied form of the function goog.partial()
+ *     was invoked as a method of.
+ */
+goog.functions.partialRight = function(fn, var_args) {
+  var rightArgs = Array.prototype.slice.call(arguments, 1);
+  return function() {
+    var newArgs = Array.prototype.slice.call(arguments);
+    newArgs.push.apply(newArgs, rightArgs);
+    return fn.apply(this, newArgs);
+  };
+};
+
+
+/**
+ * Given a function, create a new function that swallows its return value
+ * and replaces it with a new one.
+ * @param {Function} f A function.
+ * @param {T} retValue A new return value.
+ * @return {function(...?):T} A new function.
+ * @template T
+ */
+goog.functions.withReturnValue = function(f, retValue) {
+  return goog.functions.sequence(f, goog.functions.constant(retValue));
+};
+
+
+/**
+ * Creates a function that returns whether its argument equals the given value.
+ *
+ * Example:
+ * var key = goog.object.findKey(obj, goog.functions.equalTo('needle'));
+ *
+ * @param {*} value The value to compare to.
+ * @param {boolean=} opt_useLooseComparison Whether to use a loose (==)
+ *     comparison rather than a strict (===) one. Defaults to false.
+ * @return {function(*):boolean} The new function.
+ */
+goog.functions.equalTo = function(value, opt_useLooseComparison) {
+  return function(other) {
+    return opt_useLooseComparison ? (value == other) : (value === other);
+  };
+};
+
+
+/**
+ * Creates the composition of the functions passed in.
+ * For example, (goog.functions.compose(f, g))(a) is equivalent to f(g(a)).
+ * @param {function(...?):T} fn The final function.
+ * @param {...Function} var_args A list of functions.
+ * @return {function(...?):T} The composition of all inputs.
+ * @template T
+ */
+goog.functions.compose = function(fn, var_args) {
+  var functions = arguments;
+  var length = functions.length;
+  return function() {
+    var result;
+    if (length) {
+      result = functions[length - 1].apply(this, arguments);
+    }
+
+    for (var i = length - 2; i >= 0; i--) {
+      result = functions[i].call(this, result);
+    }
+    return result;
+  };
+};
+
+
+/**
+ * Creates a function that calls the functions passed in in sequence, and
+ * returns the value of the last function. For example,
+ * (goog.functions.sequence(f, g))(x) is equivalent to f(x),g(x).
+ * @param {...Function} var_args A list of functions.
+ * @return {!Function} A function that calls all inputs in sequence.
+ */
+goog.functions.sequence = function(var_args) {
+  var functions = arguments;
+  var length = functions.length;
+  return function() {
+    var result;
+    for (var i = 0; i < length; i++) {
+      result = functions[i].apply(this, arguments);
+    }
+    return result;
+  };
+};
+
+
+/**
+ * Creates a function that returns true if each of its components evaluates
+ * to true. The components are evaluated in order, and the evaluation will be
+ * short-circuited as soon as a function returns false.
+ * For example, (goog.functions.and(f, g))(x) is equivalent to f(x) && g(x).
+ * @param {...Function} var_args A list of functions.
+ * @return {function(...?):boolean} A function that ANDs its component
+ *      functions.
+ */
+goog.functions.and = function(var_args) {
+  var functions = arguments;
+  var length = functions.length;
+  return function() {
+    for (var i = 0; i < length; i++) {
+      if (!functions[i].apply(this, arguments)) {
+        return false;
+      }
+    }
+    return true;
+  };
+};
+
+
+/**
+ * Creates a function that returns true if any of its components evaluates
+ * to true. The components are evaluated in order, and the evaluation will be
+ * short-circuited as soon as a function returns true.
+ * For example, (goog.functions.or(f, g))(x) is equivalent to f(x) || g(x).
+ * @param {...Function} var_args A list of functions.
+ * @return {function(...?):boolean} A function that ORs its component
+ *    functions.
+ */
+goog.functions.or = function(var_args) {
+  var functions = arguments;
+  var length = functions.length;
+  return function() {
+    for (var i = 0; i < length; i++) {
+      if (functions[i].apply(this, arguments)) {
+        return true;
+      }
+    }
+    return false;
+  };
+};
+
+
+/**
+ * Creates a function that returns the Boolean opposite of a provided function.
+ * For example, (goog.functions.not(f))(x) is equivalent to !f(x).
+ * @param {!Function} f The original function.
+ * @return {function(...?):boolean} A function that delegates to f and returns
+ * opposite.
+ */
+goog.functions.not = function(f) {
+  return function() { return !f.apply(this, arguments); };
+};
+
+
+/**
+ * Generic factory function to construct an object given the constructor
+ * and the arguments. Intended to be bound to create object factories.
+ *
+ * Example:
+ *
+ * var factory = goog.partial(goog.functions.create, Class);
+ *
+ * @param {function(new:T, ...)} constructor The constructor for the Object.
+ * @param {...*} var_args The arguments to be passed to the constructor.
+ * @return {T} A new instance of the class given in {@code constructor}.
+ * @template T
+ */
+goog.functions.create = function(constructor, var_args) {
+  /**
+   * @constructor
+   * @final
+   */
+  var temp = function() {};
+  temp.prototype = constructor.prototype;
+
+  // obj will have constructor's prototype in its chain and
+  // 'obj instanceof constructor' will be true.
+  var obj = new temp();
+
+  // obj is initialized by constructor.
+  // arguments is only array-like so lacks shift(), but can be used with
+  // the Array prototype function.
+  constructor.apply(obj, Array.prototype.slice.call(arguments, 1));
+  return obj;
+};
+
+
+/**
+ * @define {boolean} Whether the return value cache should be used.
+ *    This should only be used to disable caches when testing.
+ */
+goog.define('goog.functions.CACHE_RETURN_VALUE', true);
+
+
+/**
+ * Gives a wrapper function that caches the return value of a parameterless
+ * function when first called.
+ *
+ * When called for the first time, the given function is called and its
+ * return value is cached (thus this is only appropriate for idempotent
+ * functions).  Subsequent calls will return the cached return value. This
+ * allows the evaluation of expensive functions to be delayed until first used.
+ *
+ * To cache the return values of functions with parameters, see goog.memoize.
+ *
+ * @param {function():T} fn A function to lazily evaluate.
+ * @return {function():T} A wrapped version the function.
+ * @template T
+ */
+goog.functions.cacheReturnValue = function(fn) {
+  var called = false;
+  var value;
+
+  return function() {
+    if (!goog.functions.CACHE_RETURN_VALUE) {
+      return fn();
+    }
+
+    if (!called) {
+      value = fn();
+      called = true;
+    }
+
+    return value;
+  };
+};
+
+
+/**
+ * Wraps a function to allow it to be called, at most, once. All
+ * additional calls are no-ops.
+ *
+ * This is particularly useful for initialization functions
+ * that should be called, at most, once.
+ *
+ * @param {function():*} f Function to call.
+ * @return {function():undefined} Wrapped function.
+ */
+goog.functions.once = function(f) {
+  // Keep a reference to the function that we null out when we're done with
+  // it -- that way, the function can be GC'd when we're done with it.
+  var inner = f;
+  return function() {
+    if (inner) {
+      var tmp = inner;
+      inner = null;
+      tmp();
+    }
+  };
+};
+
+
+/**
+ * Wraps a function to allow it to be called, at most, once per interval
+ * (specified in milliseconds). If the wrapper function is called N times within
+ * that interval, only the Nth call will go through.
+ *
+ * This is particularly useful for batching up repeated actions where the
+ * last action should win. This can be used, for example, for refreshing an
+ * autocomplete pop-up every so often rather than updating with every keystroke,
+ * since the final text typed by the user is the one that should produce the
+ * final autocomplete results. For more stateful debouncing with support for
+ * pausing, resuming, and canceling debounced actions, use {@code
+ * goog.async.Debouncer}.
+ *
+ * @param {function(this:SCOPE, ...?)} f Function to call.
+ * @param {number} interval Interval over which to debounce. The function will
+ *     only be called after the full interval has elapsed since the last call.
+ * @param {SCOPE=} opt_scope Object in whose scope to call the function.
+ * @return {function(...?): undefined} Wrapped function.
+ * @template SCOPE
+ */
+goog.functions.debounce = function(f, interval, opt_scope) {
+  var timeout = 0;
+  return /** @type {function(...?)} */ (function(var_args) {
+    goog.global.clearTimeout(timeout);
+    var args = arguments;
+    timeout = goog.global.setTimeout(function() {
+      f.apply(opt_scope, args);
+    }, interval);
+  });
+};
+
+
+/**
+ * Wraps a function to allow it to be called, at most, once per interval
+ * (specified in milliseconds). If the wrapper function is called N times in
+ * that interval, both the 1st and the Nth calls will go through.
+ *
+ * This is particularly useful for limiting repeated user requests where the
+ * the last action should win, but you also don't want to wait until the end of
+ * the interval before sending a request out, as it leads to a perception of
+ * slowness for the user.
+ *
+ * @param {function(this:SCOPE, ...?)} f Function to call.
+ * @param {number} interval Interval over which to throttle. The function can
+ *     only be called once per interval.
+ * @param {SCOPE=} opt_scope Object in whose scope to call the function.
+ * @return {function(...?): undefined} Wrapped function.
+ * @template SCOPE
+ */
+goog.functions.throttle = function(f, interval, opt_scope) {
+  var timeout = 0;
+  var shouldFire = false;
+  var args = [];
+
+  var handleTimeout = function() {
+    timeout = 0;
+    if (shouldFire) {
+      shouldFire = false;
+      fire();
+    }
+  };
+
+  var fire = function() {
+    timeout = goog.global.setTimeout(handleTimeout, interval);
+    f.apply(opt_scope, args);
+  };
+
+  return /** @type {function(...?)} */ (function(var_args) {
+    args = arguments;
+    if (!timeout) {
+      fire();
+    } else {
+      shouldFire = true;
+    }
+  });
+};
+
+
+/**
+ * Wraps a function to allow it to be called, at most, once per interval
+ * (specified in milliseconds). If the wrapper function is called N times within
+ * that interval, only the 1st call will go through.
+ *
+ * This is particularly useful for limiting repeated user requests where the
+ * first request is guaranteed to have all the data required to perform the
+ * final action, so there's no need to wait until the end of the interval before
+ * sending the request out.
+ *
+ * @param {function(this:SCOPE, ...?)} f Function to call.
+ * @param {number} interval Interval over which to rate-limit. The function will
+ *     only be called once per interval, and ignored for the remainer of the
+ *     interval.
+ * @param {SCOPE=} opt_scope Object in whose scope to call the function.
+ * @return {function(...?): undefined} Wrapped function.
+ * @template SCOPE
+ */
+goog.functions.rateLimit = function(f, interval, opt_scope) {
+  var timeout = 0;
+
+  var handleTimeout = function() {
+    timeout = 0;
+  };
+
+  return /** @type {function(...?)} */ (function(var_args) {
+    if (!timeout) {
+      timeout = goog.global.setTimeout(handleTimeout, interval);
+      f.apply(opt_scope, arguments);
+    }
+  });
+};