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| -rw-r--r-- | remote/shared/DOM.sys.mjs | 1219 |
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diff --git a/remote/shared/DOM.sys.mjs b/remote/shared/DOM.sys.mjs new file mode 100644 index 0000000000..664f02328c --- /dev/null +++ b/remote/shared/DOM.sys.mjs @@ -0,0 +1,1219 @@ +/* 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/. */ + +const lazy = {}; + +ChromeUtils.defineESModuleGetters(lazy, { + atom: "chrome://remote/content/marionette/atom.sys.mjs", + error: "chrome://remote/content/shared/webdriver/Errors.sys.mjs", + PollPromise: "chrome://remote/content/marionette/sync.sys.mjs", +}); + +const ORDERED_NODE_ITERATOR_TYPE = 5; +const FIRST_ORDERED_NODE_TYPE = 9; + +const DOCUMENT_FRAGMENT_NODE = 11; +const ELEMENT_NODE = 1; + +const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"; + +/** XUL elements that support checked property. */ +const XUL_CHECKED_ELS = new Set(["button", "checkbox", "toolbarbutton"]); + +/** XUL elements that support selected property. */ +const XUL_SELECTED_ELS = new Set([ + "menu", + "menuitem", + "menuseparator", + "radio", + "richlistitem", + "tab", +]); + +/** + * This module provides shared functionality for dealing with DOM- + * and web elements in Marionette. + * + * A web element is an abstraction used to identify an element when it + * is transported across the protocol, between remote- and local ends. + * + * Each element has an associated web element reference (a UUID) that + * uniquely identifies the the element across all browsing contexts. The + * web element reference for every element representing the same element + * is the same. + * + * @namespace + */ +export const dom = {}; + +dom.Strategy = { + ClassName: "class name", + Selector: "css selector", + ID: "id", + Name: "name", + LinkText: "link text", + PartialLinkText: "partial link text", + TagName: "tag name", + XPath: "xpath", +}; + +/** + * Find a single element or a collection of elements starting at the + * document root or a given node. + * + * If |timeout| is above 0, an implicit search technique is used. + * This will wait for the duration of <var>timeout</var> for the + * element to appear in the DOM. + * + * See the {@link dom.Strategy} enum for a full list of supported + * search strategies that can be passed to <var>strategy</var>. + * + * @param {Object<string, WindowProxy>} container + * Window object. + * @param {string} strategy + * Search strategy whereby to locate the element(s). + * @param {string} selector + * Selector search pattern. The selector must be compatible with + * the chosen search <var>strategy</var>. + * @param {object=} options + * @param {boolean=} options.all + * If true, a multi-element search selector is used and a sequence of + * elements will be returned, otherwise a single element. Defaults to false. + * @param {Element=} options.startNode + * Element to use as the root of the search. + * @param {number=} options.timeout + * Duration to wait before timing out the search. If <code>all</code> + * is false, a {@link NoSuchElementError} is thrown if unable to + * find the element within the timeout duration. + * + * @returns {Promise.<(Element|Array.<Element>)>} + * Single element or a sequence of elements. + * + * @throws InvalidSelectorError + * If <var>strategy</var> is unknown. + * @throws InvalidSelectorError + * If <var>selector</var> is malformed. + * @throws NoSuchElementError + * If a single element is requested, this error will throw if the + * element is not found. + */ +dom.find = function (container, strategy, selector, options = {}) { + const { all = false, startNode, timeout = 0 } = options; + + let searchFn; + if (all) { + searchFn = findElements.bind(this); + } else { + searchFn = findElement.bind(this); + } + + return new Promise((resolve, reject) => { + let findElements = new lazy.PollPromise( + async (resolve, reject) => { + try { + let res = await find_(container, strategy, selector, searchFn, { + all, + startNode, + }); + if (res.length) { + resolve(Array.from(res)); + } else { + reject([]); + } + } catch (e) { + reject(e); + } + }, + { timeout } + ); + + findElements.then(foundEls => { + // the following code ought to be moved into findElement + // and findElements when bug 1254486 is addressed + if (!all && (!foundEls || !foundEls.length)) { + let msg = `Unable to locate element: ${selector}`; + reject(new lazy.error.NoSuchElementError(msg)); + } + + if (all) { + resolve(foundEls); + } + resolve(foundEls[0]); + }, reject); + }); +}; + +async function find_( + container, + strategy, + selector, + searchFn, + { startNode = null, all = false } = {} +) { + let rootNode; + + if (dom.isShadowRoot(startNode)) { + rootNode = startNode.ownerDocument; + } else { + rootNode = container.frame.document; + } + + if (!startNode) { + startNode = rootNode; + } + + let res; + try { + res = await searchFn(strategy, selector, rootNode, startNode); + } catch (e) { + throw new lazy.error.InvalidSelectorError( + `Given ${strategy} expression "${selector}" is invalid: ${e}` + ); + } + + if (res) { + if (all) { + return res; + } + return [res]; + } + return []; +} + +/** + * Find a single element by XPath expression. + * + * @param {Document} document + * Document root. + * @param {Element} startNode + * Where in the DOM hiearchy to begin searching. + * @param {string} expression + * XPath search expression. + * + * @returns {Node} + * First element matching <var>expression</var>. + */ +dom.findByXPath = function (document, startNode, expression) { + let iter = document.evaluate( + expression, + startNode, + null, + FIRST_ORDERED_NODE_TYPE, + null + ); + return iter.singleNodeValue; +}; + +/** + * Find elements by XPath expression. + * + * @param {Document} document + * Document root. + * @param {Element} startNode + * Where in the DOM hierarchy to begin searching. + * @param {string} expression + * XPath search expression. + * + * @returns {Iterable.<Node>} + * Iterator over nodes matching <var>expression</var>. + */ +dom.findByXPathAll = function* (document, startNode, expression) { + let iter = document.evaluate( + expression, + startNode, + null, + ORDERED_NODE_ITERATOR_TYPE, + null + ); + let el = iter.iterateNext(); + while (el) { + yield el; + el = iter.iterateNext(); + } +}; + +/** + * Find all hyperlinks descendant of <var>startNode</var> which + * link text is <var>linkText</var>. + * + * @param {Element} startNode + * Where in the DOM hierarchy to begin searching. + * @param {string} linkText + * Link text to search for. + * + * @returns {Iterable.<HTMLAnchorElement>} + * Sequence of link elements which text is <var>s</var>. + */ +dom.findByLinkText = function (startNode, linkText) { + return filterLinks(startNode, async link => { + const visibleText = await lazy.atom.getVisibleText(link, link.ownerGlobal); + return visibleText.trim() === linkText; + }); +}; + +/** + * Find all hyperlinks descendant of <var>startNode</var> which + * link text contains <var>linkText</var>. + * + * @param {Element} startNode + * Where in the DOM hierachy to begin searching. + * @param {string} linkText + * Link text to search for. + * + * @returns {Iterable.<HTMLAnchorElement>} + * Iterator of link elements which text containins + * <var>linkText</var>. + */ +dom.findByPartialLinkText = function (startNode, linkText) { + return filterLinks(startNode, async link => { + const visibleText = await lazy.atom.getVisibleText(link, link.ownerGlobal); + + return visibleText.includes(linkText); + }); +}; + +/** + * Filters all hyperlinks that are descendant of <var>startNode</var> + * by <var>predicate</var>. + * + * @param {Element} startNode + * Where in the DOM hierarchy to begin searching. + * @param {function(HTMLAnchorElement): boolean} predicate + * Function that determines if given link should be included in + * return value or filtered away. + * + * @returns {Array.<HTMLAnchorElement>} + * Array of link elements matching <var>predicate</var>. + */ +async function filterLinks(startNode, predicate) { + const links = []; + + for (const link of getLinks(startNode)) { + if (await predicate(link)) { + links.push(link); + } + } + + return links; +} + +/** + * Finds a single element. + * + * @param {dom.Strategy} strategy + * Selector strategy to use. + * @param {string} selector + * Selector expression. + * @param {Document} document + * Document root. + * @param {Element=} startNode + * Optional Element from which to start searching. + * + * @returns {Element} + * Found element. + * + * @throws {InvalidSelectorError} + * If strategy <var>using</var> is not recognised. + * @throws {Error} + * If selector expression <var>selector</var> is malformed. + */ +async function findElement( + strategy, + selector, + document, + startNode = undefined +) { + switch (strategy) { + case dom.Strategy.ID: { + if (startNode.getElementById) { + return startNode.getElementById(selector); + } + let expr = `.//*[@id="${selector}"]`; + return dom.findByXPath(document, startNode, expr); + } + + case dom.Strategy.Name: { + if (startNode.getElementsByName) { + return startNode.getElementsByName(selector)[0]; + } + let expr = `.//*[@name="${selector}"]`; + return dom.findByXPath(document, startNode, expr); + } + + case dom.Strategy.ClassName: + return startNode.getElementsByClassName(selector)[0]; + + case dom.Strategy.TagName: + return startNode.getElementsByTagName(selector)[0]; + + case dom.Strategy.XPath: + return dom.findByXPath(document, startNode, selector); + + case dom.Strategy.LinkText: { + const links = getLinks(startNode); + for (const link of links) { + const visibleText = await lazy.atom.getVisibleText( + link, + link.ownerGlobal + ); + if (visibleText.trim() === selector) { + return link; + } + } + return undefined; + } + + case dom.Strategy.PartialLinkText: { + const links = getLinks(startNode); + for (const link of links) { + const visibleText = await lazy.atom.getVisibleText( + link, + link.ownerGlobal + ); + if (visibleText.includes(selector)) { + return link; + } + } + return undefined; + } + + case dom.Strategy.Selector: + try { + return startNode.querySelector(selector); + } catch (e) { + throw new lazy.error.InvalidSelectorError( + `${e.message}: "${selector}"` + ); + } + } + + throw new lazy.error.InvalidSelectorError(`No such strategy: ${strategy}`); +} + +/** + * Find multiple elements. + * + * @param {dom.Strategy} strategy + * Selector strategy to use. + * @param {string} selector + * Selector expression. + * @param {Document} document + * Document root. + * @param {Element=} startNode + * Optional Element from which to start searching. + * + * @returns {Array.<Element>} + * Found elements. + * + * @throws {InvalidSelectorError} + * If strategy <var>strategy</var> is not recognised. + * @throws {Error} + * If selector expression <var>selector</var> is malformed. + */ +async function findElements( + strategy, + selector, + document, + startNode = undefined +) { + switch (strategy) { + case dom.Strategy.ID: + selector = `.//*[@id="${selector}"]`; + + // fall through + case dom.Strategy.XPath: + return [...dom.findByXPathAll(document, startNode, selector)]; + + case dom.Strategy.Name: + if (startNode.getElementsByName) { + return startNode.getElementsByName(selector); + } + return [ + ...dom.findByXPathAll(document, startNode, `.//*[@name="${selector}"]`), + ]; + + case dom.Strategy.ClassName: + return startNode.getElementsByClassName(selector); + + case dom.Strategy.TagName: + return startNode.getElementsByTagName(selector); + + case dom.Strategy.LinkText: + return [...(await dom.findByLinkText(startNode, selector))]; + + case dom.Strategy.PartialLinkText: + return [...(await dom.findByPartialLinkText(startNode, selector))]; + + case dom.Strategy.Selector: + return startNode.querySelectorAll(selector); + + default: + throw new lazy.error.InvalidSelectorError( + `No such strategy: ${strategy}` + ); + } +} + +function getLinks(startNode) { + // DocumentFragment doesn't have `getElementsByTagName` so using `querySelectorAll`. + if (dom.isShadowRoot(startNode)) { + return startNode.querySelectorAll("a"); + } + return startNode.getElementsByTagName("a"); +} + +/** + * Finds the closest parent node of <var>startNode</var> matching a CSS + * <var>selector</var> expression. + * + * @param {Node} startNode + * Cycle through <var>startNode</var>'s parent nodes in tree-order + * and return the first match to <var>selector</var>. + * @param {string} selector + * CSS selector expression. + * + * @returns {Node=} + * First match to <var>selector</var>, or null if no match was found. + */ +dom.findClosest = function (startNode, selector) { + let node = startNode; + while (node.parentNode && node.parentNode.nodeType == ELEMENT_NODE) { + node = node.parentNode; + if (node.matches(selector)) { + return node; + } + } + return null; +}; + +/** + * Determines if <var>obj<var> is an HTML or JS collection. + * + * @param {object} seq + * Type to determine. + * + * @returns {boolean} + * True if <var>seq</va> is a collection. + */ +dom.isCollection = function (seq) { + switch (Object.prototype.toString.call(seq)) { + case "[object Arguments]": + case "[object Array]": + case "[object DOMTokenList]": + case "[object FileList]": + case "[object HTMLAllCollection]": + case "[object HTMLCollection]": + case "[object HTMLFormControlsCollection]": + case "[object HTMLOptionsCollection]": + case "[object NodeList]": + return true; + + default: + return false; + } +}; + +/** + * Determines if <var>shadowRoot</var> is detached. + * + * A ShadowRoot is detached if its node document is not the active document + * or if the element node referred to as its host is stale. + * + * @param {ShadowRoot} shadowRoot + * ShadowRoot to check for detached state. + * + * @returns {boolean} + * True if <var>shadowRoot</var> is detached, false otherwise. + */ +dom.isDetached = function (shadowRoot) { + return !shadowRoot.ownerDocument.isActive() || dom.isStale(shadowRoot.host); +}; + +/** + * Determines if <var>el</var> is stale. + * + * An element is stale if its node document is not the active document + * or if it is not connected. + * + * @param {Element} el + * Element to check for staleness. + * + * @returns {boolean} + * True if <var>el</var> is stale, false otherwise. + */ +dom.isStale = function (el) { + if (!el.ownerGlobal) { + // Without a valid inner window the document is basically closed. + return true; + } + + return !el.ownerDocument.isActive() || !el.isConnected; +}; + +/** + * Determine if <var>el</var> is selected or not. + * + * This operation only makes sense on + * <tt><input type=checkbox></tt>, + * <tt><input type=radio></tt>, + * and <tt>>option></tt> elements. + * + * @param {Element} el + * Element to test if selected. + * + * @returns {boolean} + * True if element is selected, false otherwise. + */ +dom.isSelected = function (el) { + if (!el) { + return false; + } + + if (dom.isXULElement(el)) { + if (XUL_CHECKED_ELS.has(el.tagName)) { + return el.checked; + } else if (XUL_SELECTED_ELS.has(el.tagName)) { + return el.selected; + } + } else if (dom.isDOMElement(el)) { + if (el.localName == "input" && ["checkbox", "radio"].includes(el.type)) { + return el.checked; + } else if (el.localName == "option") { + return el.selected; + } + } + + return false; +}; + +/** + * An element is considered read only if it is an + * <code><input></code> or <code><textarea></code> + * element whose <code>readOnly</code> content IDL attribute is set. + * + * @param {Element} el + * Element to test is read only. + * + * @returns {boolean} + * True if element is read only. + */ +dom.isReadOnly = function (el) { + return ( + dom.isDOMElement(el) && + ["input", "textarea"].includes(el.localName) && + el.readOnly + ); +}; + +/** + * An element is considered disabled if it is a an element + * that can be disabled, or it belongs to a container group which + * <code>disabled</code> content IDL attribute affects it. + * + * @param {Element} el + * Element to test for disabledness. + * + * @returns {boolean} + * True if element, or its container group, is disabled. + */ +dom.isDisabled = function (el) { + if (!dom.isDOMElement(el)) { + return false; + } + + switch (el.localName) { + case "option": + case "optgroup": + if (el.disabled) { + return true; + } + let parent = dom.findClosest(el, "optgroup,select"); + return dom.isDisabled(parent); + + case "button": + case "input": + case "select": + case "textarea": + return el.disabled; + + default: + return false; + } +}; + +/** + * Denotes elements that can be used for typing and clearing. + * + * Elements that are considered WebDriver-editable are non-readonly + * and non-disabled <code><input></code> elements in the Text, + * Search, URL, Telephone, Email, Password, Date, Month, Date and + * Time Local, Number, Range, Color, and File Upload states, and + * <code><textarea></code> elements. + * + * @param {Element} el + * Element to test. + * + * @returns {boolean} + * True if editable, false otherwise. + */ +dom.isMutableFormControl = function (el) { + if (!dom.isDOMElement(el)) { + return false; + } + if (dom.isReadOnly(el) || dom.isDisabled(el)) { + return false; + } + + if (el.localName == "textarea") { + return true; + } + + if (el.localName != "input") { + return false; + } + + switch (el.type) { + case "color": + case "date": + case "datetime-local": + case "email": + case "file": + case "month": + case "number": + case "password": + case "range": + case "search": + case "tel": + case "text": + case "time": + case "url": + case "week": + return true; + + default: + return false; + } +}; + +/** + * An editing host is a node that is either an HTML element with a + * <code>contenteditable</code> attribute, or the HTML element child + * of a document whose <code>designMode</code> is enabled. + * + * @param {Element} el + * Element to determine if is an editing host. + * + * @returns {boolean} + * True if editing host, false otherwise. + */ +dom.isEditingHost = function (el) { + return ( + dom.isDOMElement(el) && + (el.isContentEditable || el.ownerDocument.designMode == "on") + ); +}; + +/** + * Determines if an element is editable according to WebDriver. + * + * An element is considered editable if it is not read-only or + * disabled, and one of the following conditions are met: + * + * <ul> + * <li>It is a <code><textarea></code> element. + * + * <li>It is an <code><input></code> element that is not of + * the <code>checkbox</code>, <code>radio</code>, <code>hidden</code>, + * <code>submit</code>, <code>button</code>, or <code>image</code> types. + * + * <li>It is content-editable. + * + * <li>It belongs to a document in design mode. + * </ul> + * + * @param {Element} el + * Element to test if editable. + * + * @returns {boolean} + * True if editable, false otherwise. + */ +dom.isEditable = function (el) { + if (!dom.isDOMElement(el)) { + return false; + } + + if (dom.isReadOnly(el) || dom.isDisabled(el)) { + return false; + } + + return dom.isMutableFormControl(el) || dom.isEditingHost(el); +}; + +/** + * This function generates a pair of coordinates relative to the viewport + * given a target element and coordinates relative to that element's + * top-left corner. + * + * @param {Node} node + * Target node. + * @param {number=} xOffset + * Horizontal offset relative to target's top-left corner. + * Defaults to the centre of the target's bounding box. + * @param {number=} yOffset + * Vertical offset relative to target's top-left corner. Defaults to + * the centre of the target's bounding box. + * + * @returns {Object<string, number>} + * X- and Y coordinates. + * + * @throws TypeError + * If <var>xOffset</var> or <var>yOffset</var> are not numbers. + */ +dom.coordinates = function (node, xOffset = undefined, yOffset = undefined) { + let box = node.getBoundingClientRect(); + + if (typeof xOffset == "undefined" || xOffset === null) { + xOffset = box.width / 2.0; + } + if (typeof yOffset == "undefined" || yOffset === null) { + yOffset = box.height / 2.0; + } + + if (typeof yOffset != "number" || typeof xOffset != "number") { + throw new TypeError("Offset must be a number"); + } + + return { + x: box.left + xOffset, + y: box.top + yOffset, + }; +}; + +/** + * This function returns true if the node is in the viewport. + * + * @param {Element} el + * Target element. + * @param {number=} x + * Horizontal offset relative to target. Defaults to the centre of + * the target's bounding box. + * @param {number=} y + * Vertical offset relative to target. Defaults to the centre of + * the target's bounding box. + * + * @returns {boolean} + * True if if <var>el</var> is in viewport, false otherwise. + */ +dom.inViewport = function (el, x = undefined, y = undefined) { + let win = el.ownerGlobal; + let c = dom.coordinates(el, x, y); + let vp = { + top: win.pageYOffset, + left: win.pageXOffset, + bottom: win.pageYOffset + win.innerHeight, + right: win.pageXOffset + win.innerWidth, + }; + + return ( + vp.left <= c.x + win.pageXOffset && + c.x + win.pageXOffset <= vp.right && + vp.top <= c.y + win.pageYOffset && + c.y + win.pageYOffset <= vp.bottom + ); +}; + +/** + * Gets the element's container element. + * + * An element container is defined by the WebDriver + * specification to be an <tt><option></tt> element in a + * <a href="https://html.spec.whatwg.org/#concept-element-contexts">valid + * element context</a>, meaning that it has an ancestral element + * that is either <tt><datalist></tt> or <tt><select></tt>. + * + * If the element does not have a valid context, its container element + * is itself. + * + * @param {Element} el + * Element to get the container of. + * + * @returns {Element} + * Container element of <var>el</var>. + */ +dom.getContainer = function (el) { + // Does <option> or <optgroup> have a valid context, + // meaning is it a child of <datalist> or <select>? + if (["option", "optgroup"].includes(el.localName)) { + return dom.findClosest(el, "datalist,select") || el; + } + + return el; +}; + +/** + * An element is in view if it is a member of its own pointer-interactable + * paint tree. + * + * This means an element is considered to be in view, but not necessarily + * pointer-interactable, if it is found somewhere in the + * <code>elementsFromPoint</code> list at <var>el</var>'s in-view + * centre coordinates. + * + * Before running the check, we change <var>el</var>'s pointerEvents + * style property to "auto", since elements without pointer events + * enabled do not turn up in the paint tree we get from + * document.elementsFromPoint. This is a specialisation that is only + * relevant when checking if the element is in view. + * + * @param {Element} el + * Element to check if is in view. + * + * @returns {boolean} + * True if <var>el</var> is inside the viewport, or false otherwise. + */ +dom.isInView = function (el) { + let originalPointerEvents = el.style.pointerEvents; + + try { + el.style.pointerEvents = "auto"; + const tree = dom.getPointerInteractablePaintTree(el); + + // Bug 1413493 - <tr> is not part of the returned paint tree yet. As + // workaround check the visibility based on the first contained cell. + if (el.localName === "tr" && el.cells && el.cells.length) { + return tree.includes(el.cells[0]); + } + + return tree.includes(el); + } finally { + el.style.pointerEvents = originalPointerEvents; + } +}; + +/** + * This function throws the visibility of the element error if the element is + * not displayed or the given coordinates are not within the viewport. + * + * @param {Element} el + * Element to check if visible. + * @param {number=} x + * Horizontal offset relative to target. Defaults to the centre of + * the target's bounding box. + * @param {number=} y + * Vertical offset relative to target. Defaults to the centre of + * the target's bounding box. + * + * @returns {boolean} + * True if visible, false otherwise. + */ +dom.isVisible = async function (el, x = undefined, y = undefined) { + let win = el.ownerGlobal; + + if (!(await lazy.atom.isElementDisplayed(el, win))) { + return false; + } + + if (el.tagName.toLowerCase() == "body") { + return true; + } + + if (!dom.inViewport(el, x, y)) { + dom.scrollIntoView(el); + if (!dom.inViewport(el)) { + return false; + } + } + return true; +}; + +/** + * A pointer-interactable element is defined to be the first + * non-transparent element, defined by the paint order found at the centre + * point of its rectangle that is inside the viewport, excluding the size + * of any rendered scrollbars. + * + * An element is obscured if the pointer-interactable paint tree at its + * centre point is empty, or the first element in this tree is not an + * inclusive descendant of itself. + * + * @param {DOMElement} el + * Element determine if is pointer-interactable. + * + * @returns {boolean} + * True if element is obscured, false otherwise. + */ +dom.isObscured = function (el) { + let tree = dom.getPointerInteractablePaintTree(el); + return !el.contains(tree[0]); +}; + +// TODO(ato): Only used by deprecated action API +// https://bugzil.la/1354578 +/** + * Calculates the in-view centre point of an element's client rect. + * + * The portion of an element that is said to be _in view_, is the + * intersection of two squares: the first square being the initial + * viewport, and the second a DOM element. From this square we + * calculate the in-view _centre point_ and convert it into CSS pixels. + * + * Although Gecko's system internals allow click points to be + * given in floating point precision, the DOM operates in CSS pixels. + * When the in-view centre point is later used to retrieve a coordinate's + * paint tree, we need to ensure to operate in the same language. + * + * As a word of warning, there appears to be inconsistencies between + * how `DOMElement.elementsFromPoint` and `DOMWindowUtils.sendMouseEvent` + * internally rounds (ceils/floors) coordinates. + * + * @param {DOMRect} rect + * Element off a DOMRect sequence produced by calling + * `getClientRects` on an {@link Element}. + * @param {WindowProxy} win + * Current window global. + * + * @returns {Map.<string, number>} + * X and Y coordinates that denotes the in-view centre point of + * `rect`. + */ +dom.getInViewCentrePoint = function (rect, win) { + const { floor, max, min } = Math; + + // calculate the intersection of the rect that is inside the viewport + let visible = { + left: max(0, min(rect.x, rect.x + rect.width)), + right: min(win.innerWidth, max(rect.x, rect.x + rect.width)), + top: max(0, min(rect.y, rect.y + rect.height)), + bottom: min(win.innerHeight, max(rect.y, rect.y + rect.height)), + }; + + // arrive at the centre point of the visible rectangle + let x = (visible.left + visible.right) / 2.0; + let y = (visible.top + visible.bottom) / 2.0; + + // convert to CSS pixels, as centre point can be float + x = floor(x); + y = floor(y); + + return { x, y }; +}; + +/** + * Produces a pointer-interactable elements tree from a given element. + * + * The tree is defined by the paint order found at the centre point of + * the element's rectangle that is inside the viewport, excluding the size + * of any rendered scrollbars. + * + * @param {DOMElement} el + * Element to determine if is pointer-interactable. + * + * @returns {Array.<DOMElement>} + * Sequence of elements in paint order. + */ +dom.getPointerInteractablePaintTree = function (el) { + const win = el.ownerGlobal; + const rootNode = el.getRootNode(); + + // pointer-interactable elements tree, step 1 + if (!el.isConnected) { + return []; + } + + // steps 2-3 + let rects = el.getClientRects(); + if (!rects.length) { + return []; + } + + // step 4 + let centre = dom.getInViewCentrePoint(rects[0], win); + + // step 5 + return rootNode.elementsFromPoint(centre.x, centre.y); +}; + +// TODO(ato): Not implemented. +// In fact, it's not defined in the spec. +dom.isKeyboardInteractable = () => true; + +/** + * Attempts to scroll into view |el|. + * + * @param {DOMElement} el + * Element to scroll into view. + */ +dom.scrollIntoView = function (el) { + if (el.scrollIntoView) { + el.scrollIntoView({ block: "end", inline: "nearest" }); + } +}; + +/** + * Ascertains whether <var>obj</var> is a DOM-, SVG-, or XUL element. + * + * @param {object} obj + * Object thought to be an <code>Element</code> or + * <code>XULElement</code>. + * + * @returns {boolean} + * True if <var>obj</var> is an element, false otherwise. + */ +dom.isElement = function (obj) { + return dom.isDOMElement(obj) || dom.isXULElement(obj); +}; + +/** + * Returns the shadow root of an element. + * + * @param {Element} el + * Element thought to have a <code>shadowRoot</code> + * @returns {ShadowRoot} + * Shadow root of the element. + */ +dom.getShadowRoot = function (el) { + const shadowRoot = el.openOrClosedShadowRoot; + if (!shadowRoot) { + throw new lazy.error.NoSuchShadowRootError(); + } + return shadowRoot; +}; + +/** + * Ascertains whether <var>node</var> is a shadow root. + * + * @param {ShadowRoot} node + * The node that will be checked to see if it has a shadow root + * + * @returns {boolean} + * True if <var>node</var> is a shadow root, false otherwise. + */ +dom.isShadowRoot = function (node) { + return ( + node && + node.nodeType === DOCUMENT_FRAGMENT_NODE && + node.containingShadowRoot == node + ); +}; + +/** + * Ascertains whether <var>obj</var> is a DOM element. + * + * @param {object} obj + * Object to check. + * + * @returns {boolean} + * True if <var>obj</var> is a DOM element, false otherwise. + */ +dom.isDOMElement = function (obj) { + return obj && obj.nodeType == ELEMENT_NODE && !dom.isXULElement(obj); +}; + +/** + * Ascertains whether <var>obj</var> is a XUL element. + * + * @param {object} obj + * Object to check. + * + * @returns {boolean} + * True if <var>obj</var> is a XULElement, false otherwise. + */ +dom.isXULElement = function (obj) { + return obj && obj.nodeType === ELEMENT_NODE && obj.namespaceURI === XUL_NS; +}; + +/** + * Ascertains whether <var>node</var> is in a privileged document. + * + * @param {Node} node + * Node to check. + * + * @returns {boolean} + * True if <var>node</var> is in a privileged document, + * false otherwise. + */ +dom.isInPrivilegedDocument = function (node) { + return !!node?.nodePrincipal?.isSystemPrincipal; +}; + +/** + * Ascertains whether <var>obj</var> is a <code>WindowProxy</code>. + * + * @param {object} obj + * Object to check. + * + * @returns {boolean} + * True if <var>obj</var> is a DOM window. + */ +dom.isDOMWindow = function (obj) { + // TODO(ato): This should use Object.prototype.toString.call(node) + // but it's not clear how to write a good xpcshell test for that, + // seeing as we stub out a WindowProxy. + return ( + typeof obj == "object" && + obj !== null && + typeof obj.toString == "function" && + obj.toString() == "[object Window]" && + obj.self === obj + ); +}; + +const boolEls = { + audio: ["autoplay", "controls", "loop", "muted"], + button: ["autofocus", "disabled", "formnovalidate"], + details: ["open"], + dialog: ["open"], + fieldset: ["disabled"], + form: ["novalidate"], + iframe: ["allowfullscreen"], + img: ["ismap"], + input: [ + "autofocus", + "checked", + "disabled", + "formnovalidate", + "multiple", + "readonly", + "required", + ], + keygen: ["autofocus", "disabled"], + menuitem: ["checked", "default", "disabled"], + ol: ["reversed"], + optgroup: ["disabled"], + option: ["disabled", "selected"], + script: ["async", "defer"], + select: ["autofocus", "disabled", "multiple", "required"], + textarea: ["autofocus", "disabled", "readonly", "required"], + track: ["default"], + video: ["autoplay", "controls", "loop", "muted"], +}; + +/** + * Tests if the attribute is a boolean attribute on element. + * + * @param {Element} el + * Element to test if <var>attr</var> is a boolean attribute on. + * @param {string} attr + * Attribute to test is a boolean attribute. + * + * @returns {boolean} + * True if the attribute is boolean, false otherwise. + */ +dom.isBooleanAttribute = function (el, attr) { + if (!dom.isDOMElement(el)) { + return false; + } + + // global boolean attributes that apply to all HTML elements, + // except for custom elements + const customElement = !el.localName.includes("-"); + if ((attr == "hidden" || attr == "itemscope") && customElement) { + return true; + } + + if (!boolEls.hasOwnProperty(el.localName)) { + return false; + } + return boolEls[el.localName].includes(attr); +}; |