gecko-dev/testing/marionette/marionette-elements.js

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JavaScript

/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* The ElementManager manages DOM references and interactions with elements.
* According to the WebDriver spec (http://code.google.com/p/selenium/wiki/JsonWireProtocol), the
* server sends the client an element reference, and maintains the map of reference to element.
* The client uses this reference when querying/interacting with the element, and the
* server uses maps this reference to the actual element when it executes the command.
*/
this.EXPORTED_SYMBOLS = [
"Accessibility",
"ElementManager",
"CLASS_NAME",
"SELECTOR",
"ID",
"NAME",
"LINK_TEXT",
"PARTIAL_LINK_TEXT",
"TAG",
"XPATH",
"ANON",
"ANON_ATTRIBUTE"
];
const DOCUMENT_POSITION_DISCONNECTED = 1;
let uuidGen = Components.classes["@mozilla.org/uuid-generator;1"]
.getService(Components.interfaces.nsIUUIDGenerator);
this.CLASS_NAME = "class name";
this.SELECTOR = "css selector";
this.ID = "id";
this.NAME = "name";
this.LINK_TEXT = "link text";
this.PARTIAL_LINK_TEXT = "partial link text";
this.TAG = "tag name";
this.XPATH = "xpath";
this.ANON= "anon";
this.ANON_ATTRIBUTE = "anon attribute";
function ElementException(msg, num, stack) {
this.message = msg;
this.code = num;
this.stack = stack;
}
this.Accessibility = function Accessibility() {
// A flag indicating whether the accessibility issue should be logged or cause
// an exception. Default: log to stdout.
this.strict = false;
// An interface for in-process accessibility clients
// Note: we access it lazily to not enable accessibility when it is not needed
Object.defineProperty(this, 'accessibleRetrieval', {
configurable: true,
get: function() {
delete this.accessibleRetrieval;
this.accessibleRetrieval = Components.classes[
'@mozilla.org/accessibleRetrieval;1'].getService(
Components.interfaces.nsIAccessibleRetrieval);
return this.accessibleRetrieval;
}
});
};
Accessibility.prototype = {
/**
* Accessible object roles that support some action
* @type Object
*/
actionableRoles: new Set([
'pushbutton',
'checkbutton',
'combobox',
'key',
'link',
'menuitem',
'check menu item',
'radio menu item',
'option',
'radiobutton',
'slider',
'spinbutton',
'pagetab',
'entry',
'outlineitem'
]),
/**
* Get an accessible object for a DOM element
* @param nsIDOMElement element
* @param Boolean mustHaveAccessible a flag indicating that the element must
* have an accessible object
* @return nsIAccessible object for the element
*/
getAccessibleObject(element, mustHaveAccessible = false) {
let acc = this.accessibleRetrieval.getAccessibleFor(element);
if (!acc && mustHaveAccessible) {
this.handleErrorMessage('Element does not have an accessible object');
}
return acc;
},
/**
* Check if the accessible has a role that supports some action
* @param nsIAccessible object
* @return Boolean an indicator of role being actionable
*/
isActionableRole(accessible) {
return this.actionableRoles.has(
this.accessibleRetrieval.getStringRole(accessible.role));
},
/**
* Determine if an accessible has at least one action that it supports
* @param nsIAccessible object
* @return Boolean an indicator of supporting at least one accessible action
*/
hasActionCount(accessible) {
return accessible.actionCount > 0;
},
/**
* Determine if an accessible has a valid name
* @param nsIAccessible object
* @return Boolean an indicator that the element has a non empty valid name
*/
hasValidName(accessible) {
return accessible.name && accessible.name.trim();
},
/**
* Check if an accessible has a set hidden attribute
* @param nsIAccessible object
* @return Boolean an indicator that the element has a hidden accessible
* attribute set to true
*/
hasHiddenAttribute(accessible) {
let hidden;
try {
hidden = accessible.attributes.getStringProperty('hidden');
} finally {
// If the property is missing, exception will be thrown.
return hidden && hidden === 'true';
}
},
/**
* Verify if an accessible has a given state
* @param nsIAccessible object
* @param String stateName name of the state to match
* @return Boolean accessible has a state
*/
matchState(accessible, stateName) {
let stateToMatch = Components.interfaces.nsIAccessibleStates[stateName];
let state = {};
accessible.getState(state, {});
return !!(state.value & stateToMatch);
},
/**
* Check if an accessible is hidden from the user of the accessibility API
* @param nsIAccessible object
* @return Boolean an indicator that the element is hidden from the user
*/
isHidden(accessible) {
while (accessible) {
if (this.hasHiddenAttribute(accessible)) {
return true;
}
accessible = accessible.parent;
}
return false;
},
/**
* Send an error message or log the error message in the log
* @param String message
*/
handleErrorMessage(message) {
if (!message) {
return;
}
if (this.strict) {
throw new ElementException(message, 56, null);
}
dump(Date.now() + " Marionette: " + message);
}
};
this.ElementManager = function ElementManager(notSupported) {
this.seenItems = {};
this.timer = Components.classes["@mozilla.org/timer;1"].createInstance(Components.interfaces.nsITimer);
this.elementStrategies = [CLASS_NAME, SELECTOR, ID, NAME, LINK_TEXT, PARTIAL_LINK_TEXT, TAG, XPATH, ANON, ANON_ATTRIBUTE];
for (let i = 0; i < notSupported.length; i++) {
this.elementStrategies.splice(this.elementStrategies.indexOf(notSupported[i]), 1);
}
}
ElementManager.prototype = {
/**
* Reset values
*/
reset: function EM_clear() {
this.seenItems = {};
},
/**
* Add element to list of seen elements
*
* @param nsIDOMElement element
* The element to add
*
* @return string
* Returns the server-assigned reference ID
*/
addToKnownElements: function EM_addToKnownElements(element) {
for (let i in this.seenItems) {
let foundEl = null;
try {
foundEl = this.seenItems[i].get();
}
catch(e) {}
if (foundEl) {
if (XPCNativeWrapper(foundEl) == XPCNativeWrapper(element)) {
return i;
}
}
else {
//cleanup reference to GC'd element
delete this.seenItems[i];
}
}
var id = uuidGen.generateUUID().toString();
this.seenItems[id] = Components.utils.getWeakReference(element);
return id;
},
/**
* Retrieve element from its unique ID
*
* @param String id
* The DOM reference ID
* @param nsIDOMWindow win
* The window that contains the element
*
* @returns nsIDOMElement
* Returns the element or throws Exception if not found
*/
getKnownElement: function EM_getKnownElement(id, win) {
let el = this.seenItems[id];
if (!el) {
throw new ElementException("Element has not been seen before. Id given was " + id, 17, null);
}
try {
el = el.get();
}
catch(e) {
el = null;
delete this.seenItems[id];
}
// use XPCNativeWrapper to compare elements; see bug 834266
let wrappedWin = XPCNativeWrapper(win);
if (!el ||
!(XPCNativeWrapper(el).ownerDocument == wrappedWin.document) ||
(XPCNativeWrapper(el).compareDocumentPosition(wrappedWin.document.documentElement) &
DOCUMENT_POSITION_DISCONNECTED)) {
throw new ElementException("The element reference is stale. Either the element " +
"is no longer attached to the DOM or the page has been refreshed.", 10, null);
}
return el;
},
/**
* Convert values to primitives that can be transported over the
* Marionette protocol.
*
* This function implements the marshaling algorithm defined in the
* WebDriver specification:
*
* https://dvcs.w3.org/hg/webdriver/raw-file/tip/webdriver-spec.html#synchronous-javascript-execution
*
* @param object val
* object to be marshaled
*
* @return object
* Returns a JSON primitive or Object
*/
wrapValue: function EM_wrapValue(val) {
let result = null;
switch (typeof(val)) {
case "undefined":
result = null;
break;
case "string":
case "number":
case "boolean":
result = val;
break;
case "object":
let type = Object.prototype.toString.call(val);
if (type == "[object Array]" ||
type == "[object NodeList]") {
result = [];
for (let i = 0; i < val.length; ++i) {
result.push(this.wrapValue(val[i]));
}
}
else if (val == null) {
result = null;
}
else if (val.nodeType == 1) {
result = {'ELEMENT': this.addToKnownElements(val)};
}
else {
result = {};
for (let prop in val) {
result[prop] = this.wrapValue(val[prop]);
}
}
break;
}
return result;
},
/**
* Convert any ELEMENT references in 'args' to the actual elements
*
* @param object args
* Arguments passed in by client
* @param nsIDOMWindow win
* The window that contains the elements
*
* @returns object
* Returns the objects passed in by the client, with the
* reference IDs replaced by the actual elements.
*/
convertWrappedArguments: function EM_convertWrappedArguments(args, win) {
let converted;
switch (typeof(args)) {
case 'number':
case 'string':
case 'boolean':
converted = args;
break;
case 'object':
if (args == null) {
converted = null;
}
else if (Object.prototype.toString.call(args) == '[object Array]') {
converted = [];
for (let i in args) {
converted.push(this.convertWrappedArguments(args[i], win));
}
}
else if (typeof(args['ELEMENT'] === 'string') &&
args.hasOwnProperty('ELEMENT')) {
converted = this.getKnownElement(args['ELEMENT'], win);
if (converted == null)
throw new ElementException("Unknown element: " + args['ELEMENT'], 500, null);
}
else {
converted = {};
for (let prop in args) {
converted[prop] = this.convertWrappedArguments(args[prop], win);
}
}
break;
}
return converted;
},
/*
* Execute* helpers
*/
/**
* Return an object with any namedArgs applied to it. Used
* to let clients use given names when refering to arguments
* in execute calls, instead of using the arguments list.
*
* @param object args
* list of arguments being passed in
*
* @return object
* If '__marionetteArgs' is in args, then
* it will return an object with these arguments
* as its members.
*/
applyNamedArgs: function EM_applyNamedArgs(args) {
namedArgs = {};
args.forEach(function(arg) {
if (arg && typeof(arg['__marionetteArgs']) === 'object') {
for (let prop in arg['__marionetteArgs']) {
namedArgs[prop] = arg['__marionetteArgs'][prop];
}
}
});
return namedArgs;
},
/**
* Find an element or elements starting at the document root or
* given node, using the given search strategy. Search
* will continue until the search timelimit has been reached.
*
* @param nsIDOMWindow win
* The window to search in
* @param object values
* The 'using' member of values will tell us which search
* method to use. The 'value' member tells us the value we
* are looking for.
* If this object has an 'element' member, this will be used
* as the start node instead of the document root
* If this object has a 'time' member, this number will be
* used to see if we have hit the search timelimit.
* @param function on_success
* The notification callback used when we are returning successfully.
* @param function on_error
The callback to invoke when an error occurs.
* @param boolean all
* If true, all found elements will be returned.
* If false, only the first element will be returned.
*
* @return nsIDOMElement or list of nsIDOMElements
* Returns the element(s) by calling the on_success function.
*/
find: function EM_find(win, values, searchTimeout, on_success, on_error, all, command_id) {
let startTime = values.time ? values.time : new Date().getTime();
let startNode = (values.element != undefined) ?
this.getKnownElement(values.element, win) : win.document;
if (this.elementStrategies.indexOf(values.using) < 0) {
throw new ElementException("No such strategy.", 32, null);
}
let found = all ? this.findElements(values.using, values.value, win.document, startNode) :
this.findElement(values.using, values.value, win.document, startNode);
let type = Object.prototype.toString.call(found);
let isArrayLike = ((type == '[object Array]') || (type == '[object HTMLCollection]') || (type == '[object NodeList]'));
if (found == null || (isArrayLike && found.length <= 0)) {
if (!searchTimeout || new Date().getTime() - startTime > searchTimeout) {
if (all) {
on_success([], command_id); // findElements should return empty list
} else {
// Format message depending on strategy if necessary
let message = "Unable to locate element: " + values.value;
if (values.using == ANON) {
message = "Unable to locate anonymous children";
} else if (values.using == ANON_ATTRIBUTE) {
message = "Unable to locate anonymous element: " + JSON.stringify(values.value);
}
on_error(message, 7, null, command_id);
}
} else {
values.time = startTime;
this.timer.initWithCallback(this.find.bind(this, win, values,
searchTimeout,
on_success, on_error, all,
command_id),
100,
Components.interfaces.nsITimer.TYPE_ONE_SHOT);
}
} else {
if (isArrayLike) {
let ids = []
for (let i = 0 ; i < found.length ; i++) {
ids.push({'ELEMENT': this.addToKnownElements(found[i])});
}
on_success(ids, command_id);
} else {
let id = this.addToKnownElements(found);
on_success({'ELEMENT':id}, command_id);
}
return;
}
},
/**
* Find a value by XPATH
*
* @param nsIDOMElement root
* Document root
* @param string value
* XPATH search string
* @param nsIDOMElement node
* start node
*
* @return nsIDOMElement
* returns the found element
*/
findByXPath: function EM_findByXPath(root, value, node) {
return root.evaluate(value, node, null,
Components.interfaces.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
},
/**
* Find values by XPATH
*
* @param nsIDOMElement root
* Document root
* @param string value
* XPATH search string
* @param nsIDOMElement node
* start node
*
* @return object
* returns a list of found nsIDOMElements
*/
findByXPathAll: function EM_findByXPathAll(root, value, node) {
let values = root.evaluate(value, node, null,
Components.interfaces.nsIDOMXPathResult.ORDERED_NODE_ITERATOR_TYPE, null);
let elements = [];
let element = values.iterateNext();
while (element) {
elements.push(element);
element = values.iterateNext();
}
return elements;
},
/**
* Helper method to find. Finds one element using find's criteria
*
* @param string using
* String identifying which search method to use
* @param string value
* Value to look for
* @param nsIDOMElement rootNode
* Document root
* @param nsIDOMElement startNode
* Node from which we start searching
*
* @return nsIDOMElement
* Returns found element or throws Exception if not found
*/
findElement: function EM_findElement(using, value, rootNode, startNode) {
let element;
switch (using) {
case ID:
element = startNode.getElementById ?
startNode.getElementById(value) :
this.findByXPath(rootNode, './/*[@id="' + value + '"]', startNode);
break;
case NAME:
element = startNode.getElementsByName ?
startNode.getElementsByName(value)[0] :
this.findByXPath(rootNode, './/*[@name="' + value + '"]', startNode);
break;
case CLASS_NAME:
element = startNode.getElementsByClassName(value)[0]; //works for >=FF3
break;
case TAG:
element = startNode.getElementsByTagName(value)[0]; //works for all elements
break;
case XPATH:
element = this.findByXPath(rootNode, value, startNode);
break;
case LINK_TEXT:
case PARTIAL_LINK_TEXT:
let allLinks = startNode.getElementsByTagName('A');
for (let i = 0; i < allLinks.length && !element; i++) {
let text = allLinks[i].text;
if (PARTIAL_LINK_TEXT == using) {
if (text.indexOf(value) != -1) {
element = allLinks[i];
}
} else if (text == value) {
element = allLinks[i];
}
}
break;
case SELECTOR:
element = startNode.querySelector(value);
break;
case ANON:
element = rootNode.getAnonymousNodes(startNode);
if (element != null) {
element = element[0];
}
break;
case ANON_ATTRIBUTE:
let attr = Object.keys(value)[0];
element = rootNode.getAnonymousElementByAttribute(startNode, attr, value[attr]);
break;
default:
throw new ElementException("No such strategy", 500, null);
}
return element;
},
/**
* Helper method to find. Finds all element using find's criteria
*
* @param string using
* String identifying which search method to use
* @param string value
* Value to look for
* @param nsIDOMElement rootNode
* Document root
* @param nsIDOMElement startNode
* Node from which we start searching
*
* @return nsIDOMElement
* Returns found elements or throws Exception if not found
*/
findElements: function EM_findElements(using, value, rootNode, startNode) {
let elements = [];
switch (using) {
case ID:
value = './/*[@id="' + value + '"]';
case XPATH:
elements = this.findByXPathAll(rootNode, value, startNode);
break;
case NAME:
elements = startNode.getElementsByName ?
startNode.getElementsByName(value) :
this.findByXPathAll(rootNode, './/*[@name="' + value + '"]', startNode);
break;
case CLASS_NAME:
elements = startNode.getElementsByClassName(value);
break;
case TAG:
elements = startNode.getElementsByTagName(value);
break;
case LINK_TEXT:
case PARTIAL_LINK_TEXT:
let allLinks = rootNode.getElementsByTagName('A');
for (let i = 0; i < allLinks.length; i++) {
let text = allLinks[i].text;
if (PARTIAL_LINK_TEXT == using) {
if (text.indexOf(value) != -1) {
elements.push(allLinks[i]);
}
} else if (text == value) {
elements.push(allLinks[i]);
}
}
break;
case SELECTOR:
elements = Array.slice(startNode.querySelectorAll(value));
break;
case ANON:
elements = rootNode.getAnonymousNodes(startNode) || [];
break;
case ANON_ATTRIBUTE:
let attr = Object.keys(value)[0];
let el = rootNode.getAnonymousElementByAttribute(startNode, attr, value[attr]);
if (el != null) {
elements = [el];
}
break;
default:
throw new ElementException("No such strategy", 500, null);
}
return elements;
},
}