text: /*!
   * Casper is a navigation utility for PhantomJS.
   *
   * Documentation: http://casperjs.org/
   * Repository:    http://github.com/n1k0/casperjs
   *
   * Copyright (c) 2011-2012 Nicolas Perriault
   *
   * Part of source code is Copyright Joyent, Inc. and other Node contributors.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included
   * in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   *
   */
  
  /*global console, escape, exports, NodeList, window*/
  
  (function(exports) {
      "use strict";
  
      exports.create = function create(options) {
          return new this.ClientUtils(options);
      };
  
      /**
       * Casper client-side helpers.
       */
      exports.ClientUtils = function ClientUtils(options) {
          /*jshint maxstatements:40*/
          // private members
          var BASE64_ENCODE_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
          var BASE64_DECODE_CHARS = new Array(
              -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
              -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
              -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
              52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
              -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
              15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
              -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
              41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
          );
          var SUPPORTED_SELECTOR_TYPES = ['css', 'xpath'];
  
          // public members
          this.options = options || {};
          this.options.scope = this.options.scope || document;
  
          /**
           * Calls a method part of the current prototype, with arguments.
           *
           * @param  {String} method Method name
           * @param  {Array}  args   arguments
           * @return {Mixed}
           */
          this.__call = function __call(method, args) {
              if (method === "__call") {
                  return;
              }
              try {
                  return this[method].apply(this, args);
              } catch (err) {
                  err.__isCallError = true;
                  return err;
              }
          };
  
          /**
           * Clicks on the DOM element behind the provided selector.
           *
           * @param  String  selector  A CSS3 selector to the element to click
           * @return Boolean
           */
          this.click = function click(selector) {
              return this.mouseEvent('click', selector);
          };
  
          /**
           * Decodes a base64 encoded string. Succeeds where window.atob() fails.
           *
           * @param  String  str  The base64 encoded contents
           * @return string
           */
          this.decode = function decode(str) {
              /*jshint maxstatements:30, maxcomplexity:30 */
              var c1, c2, c3, c4, i = 0, len = str.length, out = "";
              while (i < len) {
                  do {
                      c1 = BASE64_DECODE_CHARS[str.charCodeAt(i++) & 0xff];
                  } while (i < len && c1 === -1);
                  if (c1 === -1) {
                      break;
                  }
                  do {
                      c2 = BASE64_DECODE_CHARS[str.charCodeAt(i++) & 0xff];
                  } while (i < len && c2 === -1);
                  if (c2 === -1) {
                      break;
                  }
                  out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
                  do {
                      c3 = str.charCodeAt(i++) & 0xff;
                      if (c3 === 61)
                      return out;
                      c3 = BASE64_DECODE_CHARS[c3];
                  } while (i < len && c3 === -1);
                  if (c3 === -1) {
                      break;
                  }
                  out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
                  do {
                      c4 = str.charCodeAt(i++) & 0xff;
                      if (c4 === 61) {
                          return out;
                      }
                      c4 = BASE64_DECODE_CHARS[c4];
                  } while (i < len && c4 === -1);
                  if (c4 === -1) {
                      break;
                  }
                  out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
              }
              return out;
          };
  
          /**
           * Echoes something to casper console.
           *
           * @param  String  message
           * @return
           */
          this.echo = function echo(message) {
              console.log("[casper.echo] " + message);
          };
  
          /**
           * Browser callback.
           *
           * @param  String  message
           * @return
           */
          this.callFn = function(type, data) {
              console.log("[casper:callFn] " + JSON.stringify({type: type || false, data: data || false}));
          };
  
          /**
           * used to rewrite the dom prototype
           *
           * @param  String  message
           * @return
           */
          this.spyEnabled = true;
          this.spy = function spy(obj, fn, callback) {
              var origFn = obj[fn];
              var self = this;
  
              if (typeof origFn !== 'function') {
                  self.log('not a function...');
                  return false;
              }
  
              self.log('Attaching a spy to "' + fn + '" function...');
  
              obj[fn] = function() {
                  if (self.spyEnabled) callback.apply(this, arguments);
                  return origFn.apply(this, arguments);
              };
  
              // copy custom properties of original function to the mocked one
              Object.keys(origFn).forEach(function(key) {
                  obj[fn][key] = origFn[key];
              });
  
              obj[fn].prototype = origFn.prototype;
  
              return true;
          };
  
          /**
           * Checks if a given DOM element is visible in remove page.
           *
           * @param  Object   element  DOM element
           * @return Boolean
           */
          this.elementVisible = function elementVisible(elem) {
              var style;
              try {
                  style = window.getComputedStyle(elem, null);
              } catch (e) {
                  return false;
              }
              var hidden = style.visibility === 'hidden' || style.display === 'none';
              if (hidden) {
                  return false;
              }
              if (style.display === "inline" || style.display === "inline-block") {
                  return true;
              }
              return elem.clientHeight > 0 && elem.clientWidth > 0;
          }
  
          /**
           * Base64 encodes a string, even binary ones. Succeeds where
           * window.btoa() fails.
           *
           * @param  String  str  The string content to encode
           * @return string
           */
          this.encode = function encode(str) {
              /*jshint maxstatements:30 */
              var out = "", i = 0, len = str.length, c1, c2, c3;
              while (i < len) {
                  c1 = str.charCodeAt(i++) & 0xff;
                  if (i === len) {
                      out += BASE64_ENCODE_CHARS.charAt(c1 >> 2);
                      out += BASE64_ENCODE_CHARS.charAt((c1 & 0x3) << 4);
                      out += "==";
                      break;
                  }
                  c2 = str.charCodeAt(i++);
                  if (i === len) {
                      out += BASE64_ENCODE_CHARS.charAt(c1 >> 2);
                      out += BASE64_ENCODE_CHARS.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
                      out += BASE64_ENCODE_CHARS.charAt((c2 & 0xF) << 2);
                      out += "=";
                      break;
                  }
                  c3 = str.charCodeAt(i++);
                  out += BASE64_ENCODE_CHARS.charAt(c1 >> 2);
                  out += BASE64_ENCODE_CHARS.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));
                  out += BASE64_ENCODE_CHARS.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6));
                  out += BASE64_ENCODE_CHARS.charAt(c3 & 0x3F);
              }
              return out;
          };
  
          /**
           * Checks if a given DOM element exists in remote page.
           *
           * @param  String  selector  CSS3 selector
           * @return Boolean
           */
          this.exists = function exists(selector) {
              try {
                  return this.findAll(selector).length > 0;
              } catch (e) {
                  return false;
              }
          };
  
          /**
           * Fetches innerText within the element(s) matching a given CSS3
           * selector.
           *
           * @param  String  selector  A CSS3 selector
           * @return String
           */
          this.fetchText = function fetchText(selector) {
              var text = '', elements = this.findAll(selector);
              if (elements && elements.length) {
                  Array.prototype.forEach.call(elements, function _forEach(element) {
                      text += element.textContent || element.innerText;
                  });
              }
              return text;
          };
  
          /**
           * Fills a form with provided field values, and optionally submits it.
           *
           * @param  HTMLElement|String  form      A form element, or a CSS3 selector to a form element
           * @param  Object              vals      Field values
           * @param  Function            findType  Element finder type (css, names, xpath)
           * @return Object                        An object containing setting result for each field, including file uploads
           */
          this.fill = function fill(form, vals, findType) {
              /*jshint maxcomplexity:8*/
              var out = {
                  errors: [],
                  fields: [],
                  files:  []
              };
  
              if (!(form instanceof HTMLElement) || typeof form === "string") {
                  this.log("attempting to fetch form element from selector: '" + form + "'", "info");
                  try {
                      form = this.findOne(form);
                  } catch (e) {
                      if (e.name === "SYNTAX_ERR") {
                          out.errors.push("invalid form selector provided: '" + form + "'");
                          return out;
                      }
                  }
              }
  
              if (!form) {
                  out.errors.push("form not found");
                  return out;
              }
  
              var finders = {
                  css: function(inputSelector, formSelector) {
                      return this.findAll(inputSelector, form);
                  },
                  names: function(elementName, formSelector) {
                      return this.findAll('[name="' + elementName + '"]', form);
                  },
                  xpath: function(xpath, formSelector) {
                      return this.findAll({type: "xpath", path: xpath}, form);
                  }
              };
  
              for (var fieldSelector in vals) {
                  if (!vals.hasOwnProperty(fieldSelector)) {
                      continue;
                  }
                  var field = finders[findType || "names"].call(this, fieldSelector, form),
                      value = vals[fieldSelector];
                  if (!field || field.length === 0) {
                      out.errors.push('no field matching ' + findType + ' selector "' + fieldSelector + '" in form');
                      continue;
                  }
                  try {
                      out.fields[fieldSelector] = this.setField(field, value);
                  } catch (err) {
                      if (err.name === "FileUploadError") {
                          out.files.push({
                              type: findType,
                              selector: fieldSelector,
                              path: err.path
                          });
                      } else if (err.name === "FieldNotFound") {
                          out.errors.push('Unable to find field element in form: ' + err.toString());
                      } else {
                          out.errors.push(err.toString());
                      }
                  }
              }
              return out;
          };
  
          /**
           * Finds all DOM elements matching by the provided selector.
           *
           * @param  String            selector  CSS3 selector
           * @param  HTMLElement|null  scope     Element to search child elements within
           * @return Array|undefined
           */
          this.findAll = function findAll(selector, scope) {
              scope = scope || this.options.scope;
              try {
                  var pSelector = this.processSelector(selector);
                  if (pSelector.type === 'xpath') {
                      return this.getElementsByXPath(pSelector.path, scope);
                  } else {
                      return Array.prototype.slice.call(scope.querySelectorAll(pSelector.path));
                  }
              } catch (e) {
                  this.log('findAll(): invalid selector provided "' + selector + '":' + e, "error");
              }
          };
  
          /**
           * Finds a DOM element by the provided selector.
           *
           * @param  String            selector  CSS3 selector
           * @param  HTMLElement|null  scope     Element to search child elements within
           * @return HTMLElement|undefined
           */
          this.findOne = function findOne(selector, scope) {
              scope = scope || this.options.scope;
              try {
                  var pSelector = this.processSelector(selector);
                  if (pSelector.type === 'xpath') {
                      return this.getElementByXPath(pSelector.path, scope);
                  } else {
                      return scope.querySelector(pSelector.path);
                  }
              } catch (e) {
                  this.log('findOne(): invalid selector provided "' + selector + '":' + e, "error");
              }
          };
  
          /**
           * Downloads a resource behind an url and returns its base64-encoded
           * contents.
           *
           * @param  String  url     The resource url
           * @param  String  method  The request method, optional (default: GET)
           * @param  Object  data    The request data, optional
           * @return String          Base64 contents string
           */
          this.getBase64 = function getBase64(url, method, data) {
              return this.encode(this.getBinary(url, method, data));
          };
  
          /**
           * Retrieves string contents from a binary file behind an url. Silently
           * fails but log errors.
           *
           * @param   String   url     Url.
           * @param   String   method  HTTP method.
           * @param   Object   data    Request parameters.
           * @return  String
           */
          this.getBinary = function getBinary(url, method, data) {
              try {
                  return this.sendAJAX(url, method, data, false, {
                      overrideMimeType: "text/plain; charset=x-user-defined"
                  });
              } catch (e) {
                  if (e.name === "NETWORK_ERR" && e.code === 101) {
                      this.log("getBinary(): Unfortunately, casperjs cannot make cross domain ajax requests", "warning");
                  }
                  this.log("getBinary(): Error while fetching " + url + ": " + e, "error");
                  return "";
              }
          };
  
          /**
           * Retrieves total document height.
           * http://james.padolsey.com/javascript/get-document-height-cross-browser/
           *
           * @return {Number}
           */
          this.getDocumentHeight = function getDocumentHeight() {
              return Math.max(
                  Math.max(document.body.scrollHeight, document.documentElement.scrollHeight),
                  Math.max(document.body.offsetHeight, document.documentElement.offsetHeight),
                  Math.max(document.body.clientHeight, document.documentElement.clientHeight)
              );
          };
  
          /**
           * Retrieves bounding rect coordinates of the HTML element matching the
           * provided CSS3 selector in the following form:
           *
           * {top: y, left: x, width: w, height:, h}
           *
           * @param  String  selector
           * @return Object or null
           */
          this.getElementBounds = function getElementBounds(selector) {
              try {
                  var clipRect = this.findOne(selector).getBoundingClientRect();
                  return {
                      top:    clipRect.top,
                      left:   clipRect.left,
                      width:  clipRect.width,
                      height: clipRect.height
                  };
              } catch (e) {
                  this.log("Unable to fetch bounds for element " + selector, "warning");
              }
          };
  
          /**
           * Retrieves the list of bounding rect coordinates for all the HTML elements matching the
           * provided CSS3 selector, in the following form:
           *
           * [{top: y, left: x, width: w, height:, h},
           *  {top: y, left: x, width: w, height:, h},
           *  ...]
           *
           * @param  String  selector
           * @return Array
           */
          this.getElementsBounds = function getElementsBounds(selector) {
              var elements = this.findAll(selector);
              var self = this;
              try {
                  return Array.prototype.map.call(elements, function(element) {
                      var clipRect = element.getBoundingClientRect();
                      return {
                          top:    clipRect.top,
                          left:   clipRect.left,
                          width:  clipRect.width,
                          height: clipRect.height
                      };
                  });
              } catch (e) {
                  this.log("Unable to fetch bounds for elements matching " + selector, "warning");
              }
          };
  
          /**
           * Retrieves information about the node matching the provided selector.
           *
           * @param  String|Object  selector  CSS3/XPath selector
           * @return Object
           */
          this.getElementInfo = function getElementInfo(selector) {
              var element = this.findOne(selector);
              var bounds = this.getElementBounds(selector);
              var attributes = {};
              [].forEach.call(element.attributes, function(attr) {
                  attributes[attr.name.toLowerCase()] = attr.value;
              });
              return {
                  nodeName: element.nodeName.toLowerCase(),
                  attributes: attributes,
                  tag: element.outerHTML,
                  html: element.innerHTML,
                  text: element.textContent || element.innerText,
                  x: bounds.left,
                  y: bounds.top,
                  width: bounds.width,
                  height: bounds.height,
                  visible: this.visible(selector)
              };
          };
  
          /**
           * Retrieves information about the nodes matching the provided selector.
           *
           * @param  String|Object  selector  CSS3/XPath selector
           * @return Array
           */
          this.getElementsInfo = function getElementsInfo(selector) {
              var bounds = this.getElementsBounds(selector);
              var eleVisible = this.elementVisible;
              return [].map.call(this.findAll(selector), function(element, index) {
                  var attributes = {};
                  [].forEach.call(element.attributes, function(attr) {
                      attributes[attr.name.toLowerCase()] = attr.value;
                  });
                  return {
                      nodeName: element.nodeName.toLowerCase(),
                      attributes: attributes,
                      tag: element.outerHTML,
                      html: element.innerHTML,
                      text: element.textContent || element.innerText,
                      x: bounds[index].left,
                      y: bounds[index].top,
                      width: bounds[index].width,
                      height: bounds[index].height,
                      visible: eleVisible(element)
                  };
              });
          };
  
          /**
           * Retrieves a single DOM element matching a given XPath expression.
           *
           * @param  String            expression  The XPath expression
           * @param  HTMLElement|null  scope       Element to search child elements within
           * @return HTMLElement or null
           */
          this.getElementByXPath = function getElementByXPath(expression, scope) {
              scope = scope || this.options.scope;
              var a = document.evaluate(expression, scope, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
              if (a.snapshotLength > 0) {
                  return a.snapshotItem(0);
              }
          };
  
          /**
           * Retrieves all DOM elements matching a given XPath expression.
           *
           * @param  String            expression  The XPath expression
           * @param  HTMLElement|null  scope       Element to search child elements within
           * @return Array
           */
          this.getElementsByXPath = function getElementsByXPath(expression, scope) {
              scope = scope || this.options.scope;
              var nodes = [];
              var a = document.evaluate(expression, scope, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
              for (var i = 0; i < a.snapshotLength; i++) {
                  nodes.push(a.snapshotItem(i));
              }
              return nodes;
          };
  
          /**
           * Retrieves the value of a form field.
           *
           * @param  String  inputName  The for input name attr value
           * @param  Object  options    Object with formSelector, optional
           * @return Mixed
           */
          this.getFieldValue = function getFieldValue(inputName, options) {
              options = options || {};
              function getSingleValue(input) {
                  var type;
                  try {
                      type = input.getAttribute('type').toLowerCase();
                  } catch (e) {
                      type = 'other';
                  }
  
                  if (input.type === 'select-multiple') {
                      return [].filter.call(input.options, function(option) {
                          return !!option.selected;
                      }).map(function(option) {
                          return option.value;
                      });
                  }
  
                  if (['checkbox', 'radio'].indexOf(type) === -1) {
                      return input.value;
                  }
                  // single checkbox or… radio button (weird, I know)
                  if (input.hasAttribute('value')) {
                      return input.checked ? input.getAttribute('value') : undefined;
                  }
                  return input.checked;
              }
              function getMultipleValues(inputs) {
                  var type;
                  type = inputs[0].getAttribute('type').toLowerCase();
                  if (type === 'radio') {
                      var value;
                      [].forEach.call(inputs, function(radio) {
                          value = radio.checked ? radio.value : value;
                      });
                      return value;
                  } else if (type === 'checkbox') {
                      var values = [];
                      [].forEach.call(inputs, function(checkbox) {
                          if (checkbox.checked) {
                              values.push(checkbox.value);
                          }
                      });
                      return values;
                  }
              }
              var formSelector = '';
              if (options.formSelector) {
                  formSelector = options.formSelector + ' ';
              }
              var inputs = this.findAll(formSelector + '[name="' + inputName + '"]');
  
              if (options.inputSelector) {
                  inputs = inputs.concat(this.findAll(options.inputSelector));
              }
  
              if (options.inputXPath) {
                  inputs = inputs.concat(this.getElementsByXPath(options.inputXPath));
              }
  
              switch (inputs.length) {
                  case 0:  return undefined;
                  case 1:  return getSingleValue(inputs[0]);
                  default: return getMultipleValues(inputs);
              }
          };
  
          /**
           * Retrieves a given form all of its field values.
           *
           * @param  String  selector  A DOM CSS3/XPath selector
           * @return Object
           */
          this.getFormValues = function getFormValues(selector) {
              var form = this.findOne(selector);
              var values = {};
              var self = this;
              [].forEach.call(form.elements, function(element) {
                  var name = element.getAttribute('name');
                  if (name && !values[name]) {
                      values[name] = self.getFieldValue(name, {formSelector: selector});
                  }
              });
              return values;
          };
  
          /**
           * Logs a message. Will format the message a way CasperJS will be able
           * to log phantomjs side.
           *
           * @param  String  message  The message to log
           * @param  String  level    The log level
           */
          this.log = function log(message, level) {
              console.log("[casper:" + (level || "debug") + "] " + message);
          };
  
          /**
           * Dispatches a mouse event to the DOM element behind the provided selector.
           *
           * @param  String   type     Type of event to dispatch
           * @param  String  selector  A CSS3 selector to the element to click
           * @return Boolean
           */
          this.mouseEvent = function mouseEvent(type, selector) {
              var elem = this.findOne(selector);
              if (!elem) {
                  this.log("mouseEvent(): Couldn't find any element matching '" + selector + "' selector", "error");
                  return false;
              }
              try {
                  var evt = document.createEvent("MouseEvents");
                  var center_x = 1, center_y = 1;
                  try {
                      var pos = elem.getBoundingClientRect();
                      center_x = Math.floor((pos.left + pos.right) / 2);
                      center_y = Math.floor((pos.top + pos.bottom) / 2);
                  } catch(e) {}
                  evt.initMouseEvent(type, true, true, window, 1, 1, 1, center_x, center_y, false, false, false, false, 0, elem);
                  // dispatchEvent return value is false if at least one of the event
                  // handlers which handled this event called preventDefault;
                  // so we cannot returns this results as it cannot accurately informs on the status
                  // of the operation
                  // let's assume the event has been sent ok it didn't raise any error
                  elem.dispatchEvent(evt);
                  return true;
              } catch (e) {
                  this.log("Failed dispatching " + type + "mouse event on " + selector + ": " + e, "error");
                  return false;
              }
          };
  
          /**
           * Processes a selector input, either as a string or an object.
           *
           * If passed an object, if must be of the form:
           *
           *     selectorObject = {
           *         type: <'css' or 'xpath'>,
           *         path: <a string>
           *     }
           *
           * @param  String|Object  selector  The selector string or object
           *
           * @return an object containing 'type' and 'path' keys
           */
          this.processSelector = function processSelector(selector) {
              var selectorObject = {
                  toString: function toString() {
                      return this.type + ' selector: ' + this.path;
                  }
              };
              if (typeof selector === "string") {
                  // defaults to CSS selector
                  selectorObject.type = "css";
                  selectorObject.path = selector;
                  return selectorObject;
              } else if (typeof selector === "object") {
                  // validation
                  if (!selector.hasOwnProperty('type') || !selector.hasOwnProperty('path')) {
                      throw new Error("Incomplete selector object");
                  } else if (SUPPORTED_SELECTOR_TYPES.indexOf(selector.type) === -1) {
                      throw new Error("Unsupported selector type: " + selector.type);
                  }
                  if (!selector.hasOwnProperty('toString')) {
                      selector.toString = selectorObject.toString;
                  }
                  return selector;
              }
              throw new Error("Unsupported selector type: " + typeof selector);
          };
  
          /**
           * Removes all DOM elements matching a given XPath expression.
           *
           * @param  String  expression  The XPath expression
           * @return Array
           */
          this.removeElementsByXPath = function removeElementsByXPath(expression) {
              var a = document.evaluate(expression, document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
              for (var i = 0; i < a.snapshotLength; i++) {
                  a.snapshotItem(i).parentNode.removeChild(a.snapshotItem(i));
              }
          };
  
          /**
           * Scrolls current document to x, y coordinates.
           *
           * @param  {Number} x X position
           * @param  {Number} y Y position
           */
          this.scrollTo = function scrollTo(x, y) {
              window.scrollTo(parseInt(x || 0, 10), parseInt(y || 0, 10));
          };
  
          /**
           * Scrolls current document up to its bottom.
           */
          this.scrollToBottom = function scrollToBottom() {
              this.scrollTo(0, this.getDocumentHeight());
          },
  
          /**
           * Performs an AJAX request.
           *
           * @param   String   url      Url.
           * @param   String   method   HTTP method (default: GET).
           * @param   Object   data     Request parameters.
           * @param   Boolean  async    Asynchroneous request? (default: false)
           * @param   Object   settings Other settings when perform the ajax request
           * @return  String            Response text.
           */
          this.sendAJAX = function sendAJAX(url, method, data, async, settings) {
              var xhr = new XMLHttpRequest(),
                  dataString = "",
                  dataList = [];
              method = method && method.toUpperCase() || "GET";
              var contentType = settings && settings.contentType || "application/x-www-form-urlencoded";
              xhr.open(method, url, !!async);
              this.log("sendAJAX(): Using HTTP method: '" + method + "'", "debug");
              if (settings && settings.overrideMimeType) {
                  xhr.overrideMimeType(settings.overrideMimeType);
              }
              if (method === "POST") {
                  if (typeof data === "object") {
                      for (var k in data) {
                          dataList.push(encodeURIComponent(k) + "=" + encodeURIComponent(data[k].toString()));
                      }
                      dataString = dataList.join('&');
                      this.log("sendAJAX(): Using request data: '" + dataString + "'", "debug");
                  } else if (typeof data === "string") {
                      dataString = data;
                  }
                  xhr.setRequestHeader("Content-Type", contentType);
              }
              xhr.send(method === "POST" ? dataString : null);
              return xhr.responseText;
          };
  
          /**
           * Sets a field (or a set of fields) value. Fails silently, but log
           * error messages.
           *
           * @param  HTMLElement|NodeList  field  One or more element defining a field
           * @param  mixed                 value  The field value to set
           */
          this.setField = function setField(field, value) {
              /*jshint maxcomplexity:99 */
              var logValue, fields, out;
              value = logValue = (value || "");
  
              if (field instanceof NodeList || field instanceof Array) {
                  fields = field;
                  field = fields[0];
              }
  
              if (!(field instanceof HTMLElement)) {
                  var error = new Error('Invalid field type; only HTMLElement and NodeList are supported');
                  error.name = 'FieldNotFound';
                  throw error;
              }
  
              if (this.options && this.options.safeLogs && field.getAttribute('type') === "password") {
                  // obfuscate password value
                  logValue = new Array(value.length + 1).join("*");
              }
  
              this.log('Set "' + field.getAttribute('name') + '" field value to ' + logValue, "debug");
  
              try {
                  field.focus();
              } catch (e) {
                  this.log("Unable to focus() input field " + field.getAttribute('name') + ": " + e, "warning");
              }
  
              var nodeName = field.nodeName.toLowerCase();
  
              switch (nodeName) {
                  case "input":
                      var type = field.getAttribute('type') || "text";
                      switch (type.toLowerCase()) {
                          case "checkbox":
                              if (fields.length > 1) {
                                  var values = value;
                                  if (!Array.isArray(values)) {
                                      values = [values];
                                  }
                                  Array.prototype.forEach.call(fields, function _forEach(f) {
                                      f.checked = values.indexOf(f.value) !== -1 ? true : false;
                                  });
                              } else {
                                  field.checked = value ? true : false;
                              }
                              break;
                          case "file":
                              throw {
                                  name:    "FileUploadError",
                                  message: "File field must be filled using page.uploadFile",
                                  path:    value
                              };
                          case "radio":
                              if (fields) {
                                  Array.prototype.forEach.call(fields, function _forEach(e) {
                                      e.checked = (e.value === value);
                                  });
                              } else {
                                  out = 'Provided radio elements are empty';
                              }
                              break;
                          default:
                              field.value = value;
                              break;
                      }
                      break;
                  case "select":
                      if (field.multiple) {
                          [].forEach.call(field.options, function(option) {
                              option.selected = value.indexOf(option.value) !== -1;
                          });
                      } else {
                        field.value = value;
                      }
                      break;
                  case "textarea":
                      field.value = value;
                      break;
                  default:
                      out = 'Unsupported field type: ' + nodeName;
                      break;
              }
  
              // firing the `change` and `input` events
              ['change', 'input'].forEach(function(name) {
                  var event = document.createEvent("HTMLEvents");
                  event.initEvent(name, true, true);
                  field.dispatchEvent(event);
              });
  
              // blur the field
              try {
                  field.blur();
              } catch (err) {
                  this.log("Unable to blur() input field " + field.getAttribute('name') + ": " + err, "warning");
              }
              return out;
          };
  
          /**
           * Checks if any element matching a given selector is visible in remote page.
           *
           * @param  String  selector  CSS3 selector
           * @return Boolean
           */
          this.visible = function visible(selector) {
              return [].some.call(this.findAll(selector), this.elementVisible);
          };
  
          /**
           * Global storage used for counting
           *
           */
          var storage = {};
          function set(key, val) {
              storage[key] = val;
          }
          function incr(key, incrBy /* =1 */) {
              storage[key] = (storage[key] || 0) + (incrBy || 1);
          }
          function get(key) {
              return storage[key];
          }
  
          // exports
          this.set = set;
          this.incr = incr;
          this.get = get;
      };
  })(typeof exports ===  "object" && !(exports instanceof Element) ? exports : window);
  