angular.js/src/Angular.js

'use strict';

/* We need to tell jshint what variables are being exported */
/* global angular: true,
  msie: true,
  jqLite: true,
  jQuery: true,
  slice: true,
  splice: true,
  push: true,
  toString: true,
  ngMinErr: true,
  angularModule: true,
  uid: true,
  REGEX_STRING_REGEXP: true,
  VALIDITY_STATE_PROPERTY: true,

  lowercase: true,
  uppercase: true,
  manualLowercase: true,
  manualUppercase: true,
  nodeName_: true,
  isArrayLike: true,
  forEach: true,
  sortedKeys: true,
  forEachSorted: true,
  reverseParams: true,
  nextUid: true,
  setHashKey: true,
  extend: true,
  int: true,
  inherit: true,
  noop: true,
  identity: true,
  valueFn: true,
  isUndefined: true,
  isDefined: true,
  isObject: true,
  isString: true,
  isNumber: true,
  isDate: true,
  isArray: true,
  isFunction: true,
  isRegExp: true,
  isWindow: true,
  isScope: true,
  isFile: true,
  isBlob: true,
  isBoolean: true,
  isPromiseLike: true,
  trim: true,
  escapeForRegexp: true,
  isElement: true,
  makeMap: true,
  includes: true,
  arrayRemove: true,
  copy: true,
  shallowCopy: true,
  equals: true,
  csp: true,
  concat: true,
  sliceArgs: true,
  bind: true,
  toJsonReplacer: true,
  toJson: true,
  fromJson: true,
  startingTag: true,
  tryDecodeURIComponent: true,
  parseKeyValue: true,
  toKeyValue: true,
  encodeUriSegment: true,
  encodeUriQuery: true,
  angularInit: true,
  bootstrap: true,
  getTestability: true,
  snake_case: true,
  bindJQuery: true,
  assertArg: true,
  assertArgFn: true,
  assertNotHasOwnProperty: true,
  getter: true,
  getBlockNodes: true,
  hasOwnProperty: true,
  createMap: true,

  NODE_TYPE_ELEMENT: true,
  NODE_TYPE_TEXT: true,
  NODE_TYPE_COMMENT: true,
  NODE_TYPE_DOCUMENT: true,
  NODE_TYPE_DOCUMENT_FRAGMENT: true,
*/

////////////////////////////////////

/**
 * @ngdoc module
 * @name ng
 * @module ng
 * @description
 *
 * # ng (core module)
 * The ng module is loaded by default when an AngularJS application is started. The module itself
 * contains the essential components for an AngularJS application to function. The table below
 * lists a high level breakdown of each of the services/factories, filters, directives and testing
 * components available within this core module.
 *
 * <div doc-module-components="ng"></div>
 */

var REGEX_STRING_REGEXP = /^\/(.+)\/([a-z]*)$/;

// The name of a form control's ValidityState property.
// This is used so that it's possible for internal tests to create mock ValidityStates.
var VALIDITY_STATE_PROPERTY = 'validity';

/**
 * @ngdoc function
 * @name angular.lowercase
 * @module ng
 * @kind function
 *
 * @description Converts the specified string to lowercase.
 * @param {string} string String to be converted to lowercase.
 * @returns {string} Lowercased string.
 */
var lowercase = function(string) {return isString(string) ? string.toLowerCase() : string;};
var hasOwnProperty = Object.prototype.hasOwnProperty;

/**
 * @ngdoc function
 * @name angular.uppercase
 * @module ng
 * @kind function
 *
 * @description Converts the specified string to uppercase.
 * @param {string} string String to be converted to uppercase.
 * @returns {string} Uppercased string.
 */
var uppercase = function(string) {return isString(string) ? string.toUpperCase() : string;};


var manualLowercase = function(s) {
  /* jshint bitwise: false */
  return isString(s)
      ? s.replace(/[A-Z]/g, function(ch) {return String.fromCharCode(ch.charCodeAt(0) | 32);})
      : s;
};
var manualUppercase = function(s) {
  /* jshint bitwise: false */
  return isString(s)
      ? s.replace(/[a-z]/g, function(ch) {return String.fromCharCode(ch.charCodeAt(0) & ~32);})
      : s;
};


// String#toLowerCase and String#toUpperCase don't produce correct results in browsers with Turkish
// locale, for this reason we need to detect this case and redefine lowercase/uppercase methods
// with correct but slower alternatives.
if ('i' !== 'I'.toLowerCase()) {
  lowercase = manualLowercase;
  uppercase = manualUppercase;
}


var
    msie,             // holds major version number for IE, or NaN if UA is not IE.
    jqLite,           // delay binding since jQuery could be loaded after us.
    jQuery,           // delay binding
    slice             = [].slice,
    splice            = [].splice,
    push              = [].push,
    toString          = Object.prototype.toString,
    ngMinErr          = minErr('ng'),

    /** @name angular */
    angular           = window.angular || (window.angular = {}),
    angularModule,
    uid               = 0;

/**
 * documentMode is an IE-only property
 * http://msdn.microsoft.com/en-us/library/ie/cc196988(v=vs.85).aspx
 */
msie = document.documentMode;


/**
 * @private
 * @param {*} obj
 * @return {boolean} Returns true if `obj` is an array or array-like object (NodeList, Arguments,
 *                   String ...)
 */
function isArrayLike(obj) {
  if (obj == null || isWindow(obj)) {
    return false;
  }

  var length = obj.length;

  if (obj.nodeType === NODE_TYPE_ELEMENT && length) {
    return true;
  }

  return isString(obj) || isArray(obj) || length === 0 ||
         typeof length === 'number' && length > 0 && (length - 1) in obj;
}

/**
 * @ngdoc function
 * @name angular.forEach
 * @module ng
 * @kind function
 *
 * @description
 * Invokes the `iterator` function once for each item in `obj` collection, which can be either an
 * object or an array. The `iterator` function is invoked with `iterator(value, key, obj)`, where `value`
 * is the value of an object property or an array element, `key` is the object property key or
 * array element index and obj is the `obj` itself. Specifying a `context` for the function is optional.
 *
 * It is worth noting that `.forEach` does not iterate over inherited properties because it filters
 * using the `hasOwnProperty` method.
 *
 * Unlike ES262's
 * [Array.prototype.forEach](http://www.ecma-international.org/ecma-262/5.1/#sec-15.4.4.18),
 * Providing 'undefined' or 'null' values for `obj` will not throw a TypeError, but rather just
 * return the value provided.
 *
   ```js
     var values = {name: 'misko', gender: 'male'};
     var log = [];
     angular.forEach(values, function(value, key) {
       this.push(key + ': ' + value);
     }, log);
     expect(log).toEqual(['name: misko', 'gender: male']);
   ```
 *
 * @param {Object|Array} obj Object to iterate over.
 * @param {Function} iterator Iterator function.
 * @param {Object=} context Object to become context (`this`) for the iterator function.
 * @returns {Object|Array} Reference to `obj`.
 */

function forEach(obj, iterator, context) {
  var key, length;
  if (obj) {
    if (isFunction(obj)) {
      for (key in obj) {
        // Need to check if hasOwnProperty exists,
        // as on IE8 the result of querySelectorAll is an object without a hasOwnProperty function
        if (key != 'prototype' && key != 'length' && key != 'name' && (!obj.hasOwnProperty || obj.hasOwnProperty(key))) {
          iterator.call(context, obj[key], key, obj);
        }
      }
    } else if (isArray(obj) || isArrayLike(obj)) {
      var isPrimitive = typeof obj !== 'object';
      for (key = 0, length = obj.length; key < length; key++) {
        if (isPrimitive || key in obj) {
          iterator.call(context, obj[key], key, obj);
        }
      }
    } else if (obj.forEach && obj.forEach !== forEach) {
        obj.forEach(iterator, context, obj);
    } else {
      for (key in obj) {
        if (obj.hasOwnProperty(key)) {
          iterator.call(context, obj[key], key, obj);
        }
      }
    }
  }
  return obj;
}

function sortedKeys(obj) {
  return Object.keys(obj).sort();
}

function forEachSorted(obj, iterator, context) {
  var keys = sortedKeys(obj);
  for (var i = 0; i < keys.length; i++) {
    iterator.call(context, obj[keys[i]], keys[i]);
  }
  return keys;
}


/**
 * when using forEach the params are value, key, but it is often useful to have key, value.
 * @param {function(string, *)} iteratorFn
 * @returns {function(*, string)}
 */
function reverseParams(iteratorFn) {
  return function(value, key) { iteratorFn(key, value); };
}

/**
 * A consistent way of creating unique IDs in angular.
 *
 * Using simple numbers allows us to generate 28.6 million unique ids per second for 10 years before
 * we hit number precision issues in JavaScript.
 *
 * Math.pow(2,53) / 60 / 60 / 24 / 365 / 10 = 28.6M
 *
 * @returns {number} an unique alpha-numeric string
 */
function nextUid() {
  return ++uid;
}


/**
 * Set or clear the hashkey for an object.
 * @param obj object
 * @param h the hashkey (!truthy to delete the hashkey)
 */
function setHashKey(obj, h) {
  if (h) {
    obj.$$hashKey = h;
  }
  else {
    delete obj.$$hashKey;
  }
}

/**
 * @ngdoc function
 * @name angular.extend
 * @module ng
 * @kind function
 *
 * @description
 * Extends the destination object `dst` by copying own enumerable properties from the `src` object(s)
 * to `dst`. You can specify multiple `src` objects. If you want to preserve original objects, you can do so
 * by passing an empty object as the target: `var object = angular.extend({}, object1, object2)`.
 * Note: Keep in mind that `angular.extend` does not support recursive merge (deep copy).
 *
 * @param {Object} dst Destination object.
 * @param {...Object} src Source object(s).
 * @returns {Object} Reference to `dst`.
 */
function extend(dst) {
  var h = dst.$$hashKey;

  for (var i = 1, ii = arguments.length; i < ii; i++) {
    var obj = arguments[i];
    if (obj) {
      var keys = Object.keys(obj);
      for (var j = 0, jj = keys.length; j < jj; j++) {
        var key = keys[j];
        dst[key] = obj[key];
      }
    }
  }

  setHashKey(dst, h);
  return dst;
}

function int(str) {
  return parseInt(str, 10);
}


function inherit(parent, extra) {
  return extend(Object.create(parent), extra);
}

/**
 * @ngdoc function
 * @name angular.noop
 * @module ng
 * @kind function
 *
 * @description
 * A function that performs no operations. This function can be useful when writing code in the
 * functional style.
   ```js
     function foo(callback) {
       var result = calculateResult();
       (callback || angular.noop)(result);
     }
   ```
 */
function noop() {}
noop.$inject = [];


/**
 * @ngdoc function
 * @name angular.identity
 * @module ng
 * @kind function
 *
 * @description
 * A function that returns its first argument. This function is useful when writing code in the
 * functional style.
 *
   ```js
     function transformer(transformationFn, value) {
       return (transformationFn || angular.identity)(value);
     };
   ```
 */
function identity($) {return $;}
identity.$inject = [];


function valueFn(value) {return function() {return value;};}

/**
 * @ngdoc function
 * @name angular.isUndefined
 * @module ng
 * @kind function
 *
 * @description
 * Determines if a reference is undefined.
 *
 * @param {*} value Reference to check.
 * @returns {boolean} True if `value` is undefined.
 */
function isUndefined(value) {return typeof value === 'undefined';}


/**
 * @ngdoc function
 * @name angular.isDefined
 * @module ng
 * @kind function
 *
 * @description
 * Determines if a reference is defined.
 *
 * @param {*} value Reference to check.
 * @returns {boolean} True if `value` is defined.
 */
function isDefined(value) {return typeof value !== 'undefined';}


/**
 * @ngdoc function
 * @name angular.isObject
 * @module ng
 * @kind function
 *
 * @description
 * Determines if a reference is an `Object`. Unlike `typeof` in JavaScript, `null`s are not
 * considered to be objects. Note that JavaScript arrays are objects.
 *
 * @param {*} value Reference to check.
 * @returns {boolean} True if `value` is an `Object` but not `null`.
 */
function isObject(value) {
  // http://jsperf.com/isobject4
  return value !== null && typeof value === 'object';
}


/**
 * @ngdoc function
 * @name angular.isString
 * @module ng
 * @kind function
 *
 * @description
 * Determines if a reference is a `String`.
 *
 * @param {*} value Reference to check.
 * @returns {boolean} True if `value` is a `String`.
 */
function isString(value) {return typeof value === 'string';}


/**
 * @ngdoc function
 * @name angular.isNumber
 * @module ng
 * @kind function
 *
 * @description
 * Determines if a reference is a `Number`.
 *
 * @param {*} value Reference to check.
 * @returns {boolean} True if `value` is a `Number`.
 */
function isNumber(value) {return typeof value === 'number';}


/**
 * @ngdoc function
 * @name angular.isDate
 * @module ng
 * @kind function
 *
 * @description
 * Determines if a value is a date.
 *
 * @param {*} value Reference to check.
 * @returns {boolean} True if `value` is a `Date`.
 */
function isDate(value) {
  return toString.call(value) === '[object Date]';
}


/**
 * @ngdoc function
 * @name angular.isArray
 * @module ng
 * @kind function
 *
 * @description
 * Determines if a reference is an `Array`.
 *
 * @param {*} value Reference to check.
 * @returns {boolean} True if `value` is an `Array`.
 */
var isArray = Array.isArray;

/**
 * @ngdoc function
 * @name angular.isFunction
 * @module ng
 * @kind function
 *
 * @description
 * Determines if a reference is a `Function`.
 *
 * @param {*} value Reference to check.
 * @returns {boolean} True if `value` is a `Function`.
 */
function isFunction(value) {return typeof value === 'function';}


/**
 * Determines if a value is a regular expression object.
 *
 * @private
 * @param {*} value Reference to check.
 * @returns {boolean} True if `value` is a `RegExp`.
 */
function isRegExp(value) {
  return toString.call(value) === '[object RegExp]';
}


/**
 * Checks if `obj` is a window object.
 *
 * @private
 * @param {*} obj Object to check
 * @returns {boolean} True if `obj` is a window obj.
 */
function isWindow(obj) {
  return obj && obj.window === obj;
}


function isScope(obj) {
  return obj && obj.$evalAsync && obj.$watch;
}


function isFile(obj) {
  return toString.call(obj) === '[object File]';
}


function isBlob(obj) {
  return toString.call(obj) === '[object Blob]';
}


function isBoolean(value) {
  return typeof value === 'boolean';
}


function isPromiseLike(obj) {
  return obj && isFunction(obj.then);
}


var trim = function(value) {
  return isString(value) ? value.trim() : value;
};

// Copied from:
// http://docs.closure-library.googlecode.com/git/local_closure_goog_string_string.js.source.html#line1021
// Prereq: s is a string.
var escapeForRegexp = function(s) {
  return s.replace(/([-()\[\]{}+?*.$\^|,:#<!\\])/g, '\\$1').
           replace(/\x08/g, '\\x08');
};


/**
 * @ngdoc function
 * @name angular.isElement
 * @module ng
 * @kind function
 *
 * @description
 * Determines if a reference is a DOM element (or wrapped jQuery element).
 *
 * @param {*} value Reference to check.
 * @returns {boolean} True if `value` is a DOM element (or wrapped jQuery element).
 */
function isElement(node) {
  return !!(node &&
    (node.nodeName  // we are a direct element
    || (node.prop && node.attr && node.find)));  // we have an on and find method part of jQuery API
}

/**
 * @param str 'key1,key2,...'
 * @returns {object} in the form of {key1:true, key2:true, ...}
 */
function makeMap(str) {
  var obj = {}, items = str.split(","), i;
  for (i = 0; i < items.length; i++)
    obj[ items[i] ] = true;
  return obj;
}


function nodeName_(element) {
  return lowercase(element.nodeName || (element[0] && element[0].nodeName));
}

function includes(array, obj) {
  return Array.prototype.indexOf.call(array, obj) != -1;
}

function arrayRemove(array, value) {
  var index = array.indexOf(value);
  if (index >= 0)
    array.splice(index, 1);
  return value;
}

/**
 * @ngdoc function
 * @name angular.copy
 * @module ng
 * @kind function
 *
 * @description
 * Creates a deep copy of `source`, which should be an object or an array.
 *
 * * If no destination is supplied, a copy of the object or array is created.
 * * If a destination is provided, all of its elements (for array) or properties (for objects)
 *   are deleted and then all elements/properties from the source are copied to it.
 * * If `source` is not an object or array (inc. `null` and `undefined`), `source` is returned.
 * * If `source` is identical to 'destination' an exception will be thrown.
 *
 * @param {*} source The source that will be used to make a copy.
 *                   Can be any type, including primitives, `null`, and `undefined`.
 * @param {(Object|Array)=} destination Destination into which the source is copied. If
 *     provided, must be of the same type as `source`.
 * @returns {*} The copy or updated `destination`, if `destination` was specified.
 *
 * @example
 <example module="copyExample">
 <file name="index.html">
 <div ng-controller="ExampleController">
 <form novalidate class="simple-form">
 Name: <input type="text" ng-model="user.name" /><br />
 E-mail: <input type="email" ng-model="user.email" /><br />
 Gender: <input type="radio" ng-model="user.gender" value="male" />male
 <input type="radio" ng-model="user.gender" value="female" />female<br />
 <button ng-click="reset()">RESET</button>
 <button ng-click="update(user)">SAVE</button>
 </form>
 <pre>form = {{user | json}}</pre>
 <pre>master = {{master | json}}</pre>
 </div>

 <script>
  angular.module('copyExample', [])
    .controller('ExampleController', ['$scope', function($scope) {
      $scope.master= {};

      $scope.update = function(user) {
        // Example with 1 argument
        $scope.master= angular.copy(user);
      };

      $scope.reset = function() {
        // Example with 2 arguments
        angular.copy($scope.master, $scope.user);
      };

      $scope.reset();
    }]);
 </script>
 </file>
 </example>
 */
function copy(source, destination, stackSource, stackDest) {
  if (isWindow(source) || isScope(source)) {
    throw ngMinErr('cpws',
      "Can't copy! Making copies of Window or Scope instances is not supported.");
  }

  if (!destination) {
    destination = source;
    if (source) {
      if (isArray(source)) {
        destination = copy(source, [], stackSource, stackDest);
      } else if (isDate(source)) {
        destination = new Date(source.getTime());
      } else if (isRegExp(source)) {
        destination = new RegExp(source.source, source.toString().match(/[^\/]*$/)[0]);
        destination.lastIndex = source.lastIndex;
      } else if (isObject(source)) {
        var emptyObject = Object.create(Object.getPrototypeOf(source));
        destination = copy(source, emptyObject, stackSource, stackDest);
      }
    }
  } else {
    if (source === destination) throw ngMinErr('cpi',
      "Can't copy! Source and destination are identical.");

    stackSource = stackSource || [];
    stackDest = stackDest || [];

    if (isObject(source)) {
      var index = stackSource.indexOf(source);
      if (index !== -1) return stackDest[index];

      stackSource.push(source);
      stackDest.push(destination);
    }

    var result;
    if (isArray(source)) {
      destination.length = 0;
      for (var i = 0; i < source.length; i++) {
        result = copy(source[i], null, stackSource, stackDest);
        if (isObject(source[i])) {
          stackSource.push(source[i]);
          stackDest.push(result);
        }
        destination.push(result);
      }
    } else {
      var h = destination.$$hashKey;
      if (isArray(destination)) {
        destination.length = 0;
      } else {
        forEach(destination, function(value, key) {
          delete destination[key];
        });
      }
      for (var key in source) {
        if (source.hasOwnProperty(key)) {
          result = copy(source[key], null, stackSource, stackDest);
          if (isObject(source[key])) {
            stackSource.push(source[key]);
            stackDest.push(result);
          }
          destination[key] = result;
        }
      }
      setHashKey(destination,h);
    }

  }
  return destination;
}

/**
 * Creates a shallow copy of an object, an array or a primitive.
 *
 * Assumes that there are no proto properties for objects.
 */
function shallowCopy(src, dst) {
  if (isArray(src)) {
    dst = dst || [];

    for (var i = 0, ii = src.length; i < ii; i++) {
      dst[i] = src[i];
    }
  } else if (isObject(src)) {
    dst = dst || {};

    for (var key in src) {
      if (!(key.charAt(0) === '$' && key.charAt(1) === '$')) {
        dst[key] = src[key];
      }
    }
  }

  return dst || src;
}


/**
 * @ngdoc function
 * @name angular.equals
 * @module ng
 * @kind function
 *
 * @description
 * Determines if two objects or two values are equivalent. Supports value types, regular
 * expressions, arrays and objects.
 *
 * Two objects or values are considered equivalent if at least one of the following is true:
 *
 * * Both objects or values pass `===` comparison.
 * * Both objects or values are of the same type and all of their properties are equal by
 *   comparing them with `angular.equals`.
 * * Both values are NaN. (In JavaScript, NaN == NaN => false. But we consider two NaN as equal)
 * * Both values represent the same regular expression (In JavaScript,
 *   /abc/ == /abc/ => false. But we consider two regular expressions as equal when their textual
 *   representation matches).
 *
 * During a property comparison, properties of `function` type and properties with names
 * that begin with `$` are ignored.
 *
 * Scope and DOMWindow objects are being compared only by identify (`===`).
 *
 * @param {*} o1 Object or value to compare.
 * @param {*} o2 Object or value to compare.
 * @returns {boolean} True if arguments are equal.
 */
function equals(o1, o2) {
  if (o1 === o2) return true;
  if (o1 === null || o2 === null) return false;
  if (o1 !== o1 && o2 !== o2) return true; // NaN === NaN
  var t1 = typeof o1, t2 = typeof o2, length, key, keySet;
  if (t1 == t2) {
    if (t1 == 'object') {
      if (isArray(o1)) {
        if (!isArray(o2)) return false;
        if ((length = o1.length) == o2.length) {
          for (key = 0; key < length; key++) {
            if (!equals(o1[key], o2[key])) return false;
          }
          return true;
        }
      } else if (isDate(o1)) {
        if (!isDate(o2)) return false;
        return equals(o1.getTime(), o2.getTime());
      } else if (isRegExp(o1) && isRegExp(o2)) {
        return o1.toString() == o2.toString();
      } else {
        if (isScope(o1) || isScope(o2) || isWindow(o1) || isWindow(o2) || isArray(o2)) return false;
        keySet = {};
        for (key in o1) {
          if (key.charAt(0) === '$' || isFunction(o1[key])) continue;
          if (!equals(o1[key], o2[key])) return false;
          keySet[key] = true;
        }
        for (key in o2) {
          if (!keySet.hasOwnProperty(key) &&
              key.charAt(0) !== '$' &&
              o2[key] !== undefined &&
              !isFunction(o2[key])) return false;
        }
        return true;
      }
    }
  }
  return false;
}

var csp = function() {
  if (isDefined(csp.isActive_)) return csp.isActive_;

  var active = !!(document.querySelector('[ng-csp]') ||
                  document.querySelector('[data-ng-csp]'));

  if (!active) {
    try {
      /* jshint -W031, -W054 */
      new Function('');
      /* jshint +W031, +W054 */
    } catch (e) {
      active = true;
    }
  }

  return (csp.isActive_ = active);
};



function concat(array1, array2, index) {
  return array1.concat(slice.call(array2, index));
}

function sliceArgs(args, startIndex) {
  return slice.call(args, startIndex || 0);
}


/* jshint -W101 */
/**
 * @ngdoc function
 * @name angular.bind
 * @module ng
 * @kind function
 *
 * @description
 * Returns a function which calls function `fn` bound to `self` (`self` becomes the `this` for
 * `fn`). You can supply optional `args` that are prebound to the function. This feature is also
 * known as [partial application](http://en.wikipedia.org/wiki/Partial_application), as
 * distinguished from [function currying](http://en.wikipedia.org/wiki/Currying#Contrast_with_partial_function_application).
 *
 * @param {Object} self Context which `fn` should be evaluated in.
 * @param {function()} fn Function to be bound.
 * @param {...*} args Optional arguments to be prebound to the `fn` function call.
 * @returns {function()} Function that wraps the `fn` with all the specified bindings.
 */
/* jshint +W101 */
function bind(self, fn) {
  var curryArgs = arguments.length > 2 ? sliceArgs(arguments, 2) : [];
  if (isFunction(fn) && !(fn instanceof RegExp)) {
    return curryArgs.length
      ? function() {
          return arguments.length
            ? fn.apply(self, concat(curryArgs, arguments, 0))
            : fn.apply(self, curryArgs);
        }
      : function() {
          return arguments.length
            ? fn.apply(self, arguments)
            : fn.call(self);
        };
  } else {
    // in IE, native methods are not functions so they cannot be bound (note: they don't need to be)
    return fn;
  }
}


function toJsonReplacer(key, value) {
  var val = value;

  if (typeof key === 'string' && key.charAt(0) === '$' && key.charAt(1) === '$') {
    val = undefined;
  } else if (isWindow(value)) {
    val = '$WINDOW';
  } else if (value &&  document === value) {
    val = '$DOCUMENT';
  } else if (isScope(value)) {
    val = '$SCOPE';
  }

  return val;
}


/**
 * @ngdoc function
 * @name angular.toJson
 * @module ng
 * @kind function
 *
 * @description
 * Serializes input into a JSON-formatted string. Properties with leading $$ characters will be
 * stripped since angular uses this notation internally.
 *
 * @param {Object|Array|Date|string|number} obj Input to be serialized into JSON.
 * @param {boolean=} pretty If set to true, the JSON output will contain newlines and whitespace.
 * @returns {string|undefined} JSON-ified string representing `obj`.
 */
function toJson(obj, pretty) {
  if (typeof obj === 'undefined') return undefined;
  return JSON.stringify(obj, toJsonReplacer, pretty ? '  ' : null);
}


/**
 * @ngdoc function
 * @name angular.fromJson
 * @module ng
 * @kind function
 *
 * @description
 * Deserializes a JSON string.
 *
 * @param {string} json JSON string to deserialize.
 * @returns {Object|Array|string|number} Deserialized thingy.
 */
function fromJson(json) {
  return isString(json)
      ? JSON.parse(json)
      : json;
}


/**
 * @returns {string} Returns the string representation of the element.
 */
function startingTag(element) {
  element = jqLite(element).clone();
  try {
    // turns out IE does not let you set .html() on elements which
    // are not allowed to have children. So we just ignore it.
    element.empty();
  } catch (e) {}
  var elemHtml = jqLite('<div>').append(element).html();
  try {
    return element[0].nodeType === NODE_TYPE_TEXT ? lowercase(elemHtml) :
        elemHtml.
          match(/^(<[^>]+>)/)[1].
          replace(/^<([\w\-]+)/, function(match, nodeName) { return '<' + lowercase(nodeName); });
  } catch (e) {
    return lowercase(elemHtml);
  }

}


/////////////////////////////////////////////////

/**
 * Tries to decode the URI component without throwing an exception.
 *
 * @private
 * @param str value potential URI component to check.
 * @returns {boolean} True if `value` can be decoded
 * with the decodeURIComponent function.
 */
function tryDecodeURIComponent(value) {
  try {
    return decodeURIComponent(value);
  } catch (e) {
    // Ignore any invalid uri component
  }
}


/**
 * Parses an escaped url query string into key-value pairs.
 * @returns {Object.<string,boolean|Array>}
 */
function parseKeyValue(/**string*/keyValue) {
  var obj = {}, key_value, key;
  forEach((keyValue || "").split('&'), function(keyValue) {
    if (keyValue) {
      key_value = keyValue.replace(/\+/g,'%20').split('=');
      key = tryDecodeURIComponent(key_value[0]);
      if (isDefined(key)) {
        var val = isDefined(key_value[1]) ? tryDecodeURIComponent(key_value[1]) : true;
        if (!hasOwnProperty.call(obj, key)) {
          obj[key] = val;
        } else if (isArray(obj[key])) {
          obj[key].push(val);
        } else {
          obj[key] = [obj[key],val];
        }
      }
    }
  });
  return obj;
}

function toKeyValue(obj) {
  var parts = [];
  forEach(obj, function(value, key) {
    if (isArray(value)) {
      forEach(value, function(arrayValue) {
        parts.push(encodeUriQuery(key, true) +
                   (arrayValue === true ? '' : '=' + encodeUriQuery(arrayValue, true)));
      });
    } else {
    parts.push(encodeUriQuery(key, true) +
               (value === true ? '' : '=' + encodeUriQuery(value, true)));
    }
  });
  return parts.length ? parts.join('&') : '';
}


/**
 * We need our custom method because encodeURIComponent is too aggressive and doesn't follow
 * http://www.ietf.org/rfc/rfc3986.txt with regards to the character set (pchar) allowed in path
 * segments:
 *    segment       = *pchar
 *    pchar         = unreserved / pct-encoded / sub-delims / ":" / "@"
 *    pct-encoded   = "%" HEXDIG HEXDIG
 *    unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"
 *    sub-delims    = "!" / "$" / "&" / "'" / "(" / ")"
 *                     / "*" / "+" / "," / ";" / "="
 */
function encodeUriSegment(val) {
  return encodeUriQuery(val, true).
             replace(/%26/gi, '&').
             replace(/%3D/gi, '=').
             replace(/%2B/gi, '+');
}


/**
 * This method is intended for encoding *key* or *value* parts of query component. We need a custom
 * method because encodeURIComponent is too aggressive and encodes stuff that doesn't have to be
 * encoded per http://tools.ietf.org/html/rfc3986:
 *    query       = *( pchar / "/" / "?" )
 *    pchar         = unreserved / pct-encoded / sub-delims / ":" / "@"
 *    unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"
 *    pct-encoded   = "%" HEXDIG HEXDIG
 *    sub-delims    = "!" / "$" / "&" / "'" / "(" / ")"
 *                     / "*" / "+" / "," / ";" / "="
 */
function encodeUriQuery(val, pctEncodeSpaces) {
  return encodeURIComponent(val).
             replace(/%40/gi, '@').
             replace(/%3A/gi, ':').
             replace(/%24/g, '$').
             replace(/%2C/gi, ',').
             replace(/%3B/gi, ';').
             replace(/%20/g, (pctEncodeSpaces ? '%20' : '+'));
}

var ngAttrPrefixes = ['ng-', 'data-ng-', 'ng:', 'x-ng-'];

function getNgAttribute(element, ngAttr) {
  var attr, i, ii = ngAttrPrefixes.length;
  element = jqLite(element);
  for (i = 0; i < ii; ++i) {
    attr = ngAttrPrefixes[i] + ngAttr;
    if (isString(attr = element.attr(attr))) {
      return attr;
    }
  }
  return null;
}

/**
 * @ngdoc directive
 * @name ngApp
 * @module ng
 *
 * @element ANY
 * @param {angular.Module} ngApp an optional application
 *   {@link angular.module module} name to load.
 * @param {boolean=} ngStrictDi if this attribute is present on the app element, the injector will be
 *   created in "strict-di" mode. This means that the application will fail to invoke functions which
 *   do not use explicit function annotation (and are thus unsuitable for minification), as described
 *   in {@link guide/di the Dependency Injection guide}, and useful debugging info will assist in
 *   tracking down the root of these bugs.
 *
 * @description
 *
 * Use this directive to **auto-bootstrap** an AngularJS application. The `ngApp` directive
 * designates the **root element** of the application and is typically placed near the root element
 * of the page - e.g. on the `<body>` or `<html>` tags.
 *
 * Only one AngularJS application can be auto-bootstrapped per HTML document. The first `ngApp`
 * found in the document will be used to define the root element to auto-bootstrap as an
 * application. To run multiple applications in an HTML document you must manually bootstrap them using
 * {@link angular.bootstrap} instead. AngularJS applications cannot be nested within each other.
 *
 * You can specify an **AngularJS module** to be used as the root module for the application.  This
 * module will be loaded into the {@link auto.$injector} when the application is bootstrapped and
 * should contain the application code needed or have dependencies on other modules that will
 * contain the code. See {@link angular.module} for more information.
 *
 * In the example below if the `ngApp` directive were not placed on the `html` element then the
 * document would not be compiled, the `AppController` would not be instantiated and the `{{ a+b }}`
 * would not be resolved to `3`.
 *
 * `ngApp` is the easiest, and most common, way to bootstrap an application.
 *
 <example module="ngAppDemo">
   <file name="index.html">
   <div ng-controller="ngAppDemoController">
     I can add: {{a}} + {{b}} =  {{ a+b }}
   </div>
   </file>
   <file name="script.js">
   angular.module('ngAppDemo', []).controller('ngAppDemoController', function($scope) {
     $scope.a = 1;
     $scope.b = 2;
   });
   </file>
 </example>
 *
 * Using `ngStrictDi`, you would see something like this:
 *
 <example ng-app-included="true">
   <file name="index.html">
   <div ng-app="ngAppStrictDemo" ng-strict-di>
       <div ng-controller="GoodController1">
           I can add: {{a}} + {{b}} =  {{ a+b }}

           <p>This renders because the controller does not fail to
              instantiate, by using explicit annotation style (see
              script.js for details)
           </p>
       </div>

       <div ng-controller="GoodController2">
           Name: <input ng-model="name"><br />
           Hello, {{name}}!

           <p>This renders because the controller does not fail to
              instantiate, by using explicit annotation style
              (see script.js for details)
           </p>
       </div>

       <div ng-controller="BadController">
           I can add: {{a}} + {{b}} =  {{ a+b }}

           <p>The controller could not be instantiated, due to relying
              on automatic function annotations (which are disabled in
              strict mode). As such, the content of this section is not
              interpolated, and there should be an error in your web console.
           </p>
       </div>
   </div>
   </file>
   <file name="script.js">
   angular.module('ngAppStrictDemo', [])
     // BadController will fail to instantiate, due to relying on automatic function annotation,
     // rather than an explicit annotation
     .controller('BadController', function($scope) {
       $scope.a = 1;
       $scope.b = 2;
     })
     // Unlike BadController, GoodController1 and GoodController2 will not fail to be instantiated,
     // due to using explicit annotations using the array style and $inject property, respectively.
     .controller('GoodController1', ['$scope', function($scope) {
       $scope.a = 1;
       $scope.b = 2;
     }])
     .controller('GoodController2', GoodController2);
     function GoodController2($scope) {
       $scope.name = "World";
     }
     GoodController2.$inject = ['$scope'];
   </file>
   <file name="style.css">
   div[ng-controller] {
       margin-bottom: 1em;
       -webkit-border-radius: 4px;
       border-radius: 4px;
       border: 1px solid;
       padding: .5em;
   }
   div[ng-controller^=Good] {
       border-color: #d6e9c6;
       background-color: #dff0d8;
       color: #3c763d;
   }
   div[ng-controller^=Bad] {
       border-color: #ebccd1;
       background-color: #f2dede;
       color: #a94442;
       margin-bottom: 0;
   }
   </file>
 </example>
 */
function angularInit(element, bootstrap) {
  var appElement,
      module,
      config = {};

  // The element `element` has priority over any other element
  forEach(ngAttrPrefixes, function(prefix) {
    var name = prefix + 'app';

    if (!appElement && element.hasAttribute && element.hasAttribute(name)) {
      appElement = element;
      module = element.getAttribute(name);
    }
  });
  forEach(ngAttrPrefixes, function(prefix) {
    var name = prefix + 'app';
    var candidate;

    if (!appElement && (candidate = element.querySelector('[' + name.replace(':', '\\:') + ']'))) {
      appElement = candidate;
      module = candidate.getAttribute(name);
    }
  });
  if (appElement) {
    config.strictDi = getNgAttribute(appElement, "strict-di") !== null;
    bootstrap(appElement, module ? [module] : [], config);
  }
}

/**
 * @ngdoc function
 * @name angular.bootstrap
 * @module ng
 * @description
 * Use this function to manually start up angular application.
 *
 * See: {@link guide/bootstrap Bootstrap}
 *
 * Note that Protractor based end-to-end tests cannot use this function to bootstrap manually.
 * They must use {@link ng.directive:ngApp ngApp}.
 *
 * Angular will detect if it has been loaded into the browser more than once and only allow the
 * first loaded script to be bootstrapped and will report a warning to the browser console for
 * each of the subsequent scripts. This prevents strange results in applications, where otherwise
 * multiple instances of Angular try to work on the DOM.
 *
 * ```html
 * <!doctype html>
 * <html>
 * <body>
 * <div ng-controller="WelcomeController">
 *   {{greeting}}
 * </div>
 *
 * <script src="angular.js"></script>
 * <script>
 *   var app = angular.module('demo', [])
 *   .controller('WelcomeController', function($scope) {
 *       $scope.greeting = 'Welcome!';
 *   });
 *   angular.bootstrap(document, ['demo']);
 * </script>
 * </body>
 * </html>
 * ```
 *
 * @param {DOMElement} element DOM element which is the root of angular application.
 * @param {Array<String|Function|Array>=} modules an array of modules to load into the application.
 *     Each item in the array should be the name of a predefined module or a (DI annotated)
 *     function that will be invoked by the injector as a run block.
 *     See: {@link angular.module modules}
 * @param {Object=} config an object for defining configuration options for the application. The
 *     following keys are supported:
 *
 * * `strictDi` - disable automatic function annotation for the application. This is meant to
 *   assist in finding bugs which break minified code. Defaults to `false`.
 *
 * @returns {auto.$injector} Returns the newly created injector for this app.
 */
function bootstrap(element, modules, config) {
  if (!isObject(config)) config = {};
  var defaultConfig = {
    strictDi: false
  };
  config = extend(defaultConfig, config);
  var doBootstrap = function() {
    element = jqLite(element);

    if (element.injector()) {
      var tag = (element[0] === document) ? 'document' : startingTag(element);
      //Encode angle brackets to prevent input from being sanitized to empty string #8683
      throw ngMinErr(
          'btstrpd',
          "App Already Bootstrapped with this Element '{0}'",
          tag.replace(/</,'&lt;').replace(/>/,'&gt;'));
    }

    modules = modules || [];
    modules.unshift(['$provide', function($provide) {
      $provide.value('$rootElement', element);
    }]);

    if (config.debugInfoEnabled) {
      // Pushing so that this overrides `debugInfoEnabled` setting defined in user's `modules`.
      modules.push(['$compileProvider', function($compileProvider) {
        $compileProvider.debugInfoEnabled(true);
      }]);
    }

    modules.unshift('ng');
    var injector = createInjector(modules, config.strictDi);
    injector.invoke(['$rootScope', '$rootElement', '$compile', '$injector',
       function bootstrapApply(scope, element, compile, injector) {
        scope.$apply(function() {
          element.data('$injector', injector);
          compile(element)(scope);
        });
      }]
    );
    return injector;
  };

  var NG_ENABLE_DEBUG_INFO = /^NG_ENABLE_DEBUG_INFO!/;
  var NG_DEFER_BOOTSTRAP = /^NG_DEFER_BOOTSTRAP!/;

  if (window && NG_ENABLE_DEBUG_INFO.test(window.name)) {
    config.debugInfoEnabled = true;
    window.name = window.name.replace(NG_ENABLE_DEBUG_INFO, '');
  }

  if (window && !NG_DEFER_BOOTSTRAP.test(window.name)) {
    return doBootstrap();
  }

  window.name = window.name.replace(NG_DEFER_BOOTSTRAP, '');
  angular.resumeBootstrap = function(extraModules) {
    forEach(extraModules, function(module) {
      modules.push(module);
    });
    doBootstrap();
  };
}

/**
 * @ngdoc function
 * @name angular.reloadWithDebugInfo
 * @module ng
 * @description
 * Use this function to reload the current application with debug information turned on.
 * This takes precedence over a call to `$compileProvider.debugInfoEnabled(false)`.
 *
 * See {@link ng.$compileProvider#debugInfoEnabled} for more.
 */
function reloadWithDebugInfo() {
  window.name = 'NG_ENABLE_DEBUG_INFO!' + window.name;
  window.location.reload();
}

/**
 * @name angular.getTestability
 * @module ng
 * @description
 * Get the testability service for the instance of Angular on the given
 * element.
 * @param {DOMElement} element DOM element which is the root of angular application.
 */
function getTestability(rootElement) {
  return angular.element(rootElement).injector().get('$$testability');
}

var SNAKE_CASE_REGEXP = /[A-Z]/g;
function snake_case(name, separator) {
  separator = separator || '_';
  return name.replace(SNAKE_CASE_REGEXP, function(letter, pos) {
    return (pos ? separator : '') + letter.toLowerCase();
  });
}

var bindJQueryFired = false;
var skipDestroyOnNextJQueryCleanData;
function bindJQuery() {
  var originalCleanData;

  if (bindJQueryFired) {
    return;
  }

  // bind to jQuery if present;
  jQuery = window.jQuery;
  // Use jQuery if it exists with proper functionality, otherwise default to us.
  // Angular 1.2+ requires jQuery 1.7+ for on()/off() support.
  // Angular 1.3+ technically requires at least jQuery 2.1+ but it may work with older
  // versions. It will not work for sure with jQuery <1.7, though.
  if (jQuery && jQuery.fn.on) {
    jqLite = jQuery;
    extend(jQuery.fn, {
      scope: JQLitePrototype.scope,
      isolateScope: JQLitePrototype.isolateScope,
      controller: JQLitePrototype.controller,
      injector: JQLitePrototype.injector,
      inheritedData: JQLitePrototype.inheritedData
    });

    // All nodes removed from the DOM via various jQuery APIs like .remove()
    // are passed through jQuery.cleanData. Monkey-patch this method to fire
    // the $destroy event on all removed nodes.
    originalCleanData = jQuery.cleanData;
    jQuery.cleanData = function(elems) {
      var events;
      if (!skipDestroyOnNextJQueryCleanData) {
        for (var i = 0, elem; (elem = elems[i]) != null; i++) {
          events = jQuery._data(elem, "events");
          if (events && events.$destroy) {
            jQuery(elem).triggerHandler('$destroy');
          }
        }
      } else {
        skipDestroyOnNextJQueryCleanData = false;
      }
      originalCleanData(elems);
    };
  } else {
    jqLite = JQLite;
  }

  angular.element = jqLite;

  // Prevent double-proxying.
  bindJQueryFired = true;
}

/**
 * throw error if the argument is falsy.
 */
function assertArg(arg, name, reason) {
  if (!arg) {
    throw ngMinErr('areq', "Argument '{0}' is {1}", (name || '?'), (reason || "required"));
  }
  return arg;
}

function assertArgFn(arg, name, acceptArrayAnnotation) {
  if (acceptArrayAnnotation && isArray(arg)) {
      arg = arg[arg.length - 1];
  }

  assertArg(isFunction(arg), name, 'not a function, got ' +
      (arg && typeof arg === 'object' ? arg.constructor.name || 'Object' : typeof arg));
  return arg;
}

/**
 * throw error if the name given is hasOwnProperty
 * @param  {String} name    the name to test
 * @param  {String} context the context in which the name is used, such as module or directive
 */
function assertNotHasOwnProperty(name, context) {
  if (name === 'hasOwnProperty') {
    throw ngMinErr('badname', "hasOwnProperty is not a valid {0} name", context);
  }
}

/**
 * Return the value accessible from the object by path. Any undefined traversals are ignored
 * @param {Object} obj starting object
 * @param {String} path path to traverse
 * @param {boolean} [bindFnToScope=true]
 * @returns {Object} value as accessible by path
 */
//TODO(misko): this function needs to be removed
function getter(obj, path, bindFnToScope) {
  if (!path) return obj;
  var keys = path.split('.');
  var key;
  var lastInstance = obj;
  var len = keys.length;

  for (var i = 0; i < len; i++) {
    key = keys[i];
    if (obj) {
      obj = (lastInstance = obj)[key];
    }
  }
  if (!bindFnToScope && isFunction(obj)) {
    return bind(lastInstance, obj);
  }
  return obj;
}

/**
 * Return the DOM siblings between the first and last node in the given array.
 * @param {Array} array like object
 * @returns {jqLite} jqLite collection containing the nodes
 */
function getBlockNodes(nodes) {
  // TODO(perf): just check if all items in `nodes` are siblings and if they are return the original
  //             collection, otherwise update the original collection.
  var node = nodes[0];
  var endNode = nodes[nodes.length - 1];
  var blockNodes = [node];

  do {
    node = node.nextSibling;
    if (!node) break;
    blockNodes.push(node);
  } while (node !== endNode);

  return jqLite(blockNodes);
}


/**
 * Creates a new object without a prototype. This object is useful for lookup without having to
 * guard against prototypically inherited properties via hasOwnProperty.
 *
 * Related micro-benchmarks:
 * - http://jsperf.com/object-create2
 * - http://jsperf.com/proto-map-lookup/2
 * - http://jsperf.com/for-in-vs-object-keys2
 *
 * @returns {Object}
 */
function createMap() {
  return Object.create(null);
}

var NODE_TYPE_ELEMENT = 1;
var NODE_TYPE_TEXT = 3;
var NODE_TYPE_COMMENT = 8;
var NODE_TYPE_DOCUMENT = 9;
var NODE_TYPE_DOCUMENT_FRAGMENT = 11;