зеркало из https://github.com/mozilla/gecko-dev.git
777 строки
24 KiB
JavaScript
777 строки
24 KiB
JavaScript
/* vim: set ts=2 et sw=2 tw=80 filetype=javascript: */
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/* Copyright 2017 Mozilla Foundation and others
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* fluent-dom@0.2.0 */
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const { Localization } =
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ChromeUtils.import("resource://gre/modules/Localization.jsm", {});
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// Match the opening angle bracket (<) in HTML tags, and HTML entities like
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// &, &, &.
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const reOverlay = /<|&#?\w+;/;
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/**
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* Elements allowed in translations even if they are not present in the source
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* HTML. They are text-level elements as defined by the HTML5 spec:
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* https://www.w3.org/TR/html5/text-level-semantics.html with the exception of:
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*
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* - a - because we don't allow href on it anyways,
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* - ruby, rt, rp - because we don't allow nested elements to be inserted.
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*/
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const TEXT_LEVEL_ELEMENTS = {
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"http://www.w3.org/1999/xhtml": [
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"em", "strong", "small", "s", "cite", "q", "dfn", "abbr", "data",
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"time", "code", "var", "samp", "kbd", "sub", "sup", "i", "b", "u",
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"mark", "bdi", "bdo", "span", "br", "wbr"
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],
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};
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const LOCALIZABLE_ATTRIBUTES = {
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"http://www.w3.org/1999/xhtml": {
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global: ["title", "aria-label", "aria-valuetext", "aria-moz-hint"],
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a: ["download"],
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area: ["download", "alt"],
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// value is special-cased in isAttrNameLocalizable
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input: ["alt", "placeholder"],
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menuitem: ["label"],
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menu: ["label"],
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optgroup: ["label"],
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option: ["label"],
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track: ["label"],
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img: ["alt"],
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textarea: ["placeholder"],
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th: ["abbr"]
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},
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"http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul": {
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global: [
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"accesskey", "aria-label", "aria-valuetext", "aria-moz-hint", "label"
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],
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key: ["key", "keycode"],
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textbox: ["placeholder"],
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toolbarbutton: ["tooltiptext"],
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}
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};
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/**
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* Translate an element.
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*
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* Translate the element's text content and attributes. Some HTML markup is
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* allowed in the translation. The element's children with the data-l10n-name
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* attribute will be treated as arguments to the translation. If the
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* translation defines the same children, their attributes and text contents
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* will be used for translating the matching source child.
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*
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* @param {Element} element
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* @param {Object} translation
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* @private
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*/
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function translateElement(element, translation) {
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const {value} = translation;
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if (typeof value === "string") {
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if (!reOverlay.test(value)) {
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// If the translation doesn't contain any markup skip the overlay logic.
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element.textContent = value;
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} else {
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// Else parse the translation's HTML using an inert template element,
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// sanitize it and replace the element's content.
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const templateElement = element.ownerDocument.createElementNS(
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"http://www.w3.org/1999/xhtml", "template"
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);
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// eslint-disable-next-line no-unsanitized/property
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templateElement.innerHTML = value;
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overlayChildNodes(templateElement.content, element);
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}
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}
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// Even if the translation doesn't define any localizable attributes, run
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// overlayAttributes to remove any localizable attributes set by previous
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// translations.
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overlayAttributes(translation, element);
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}
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/**
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* Replace child nodes of an element with child nodes of another element.
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*
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* The contents of the target element will be cleared and fully replaced with
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* sanitized contents of the source element.
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*
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* @param {DocumentFragment} fromFragment - The source of children to overlay.
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* @param {Element} toElement - The target of the overlay.
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* @private
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*/
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function overlayChildNodes(fromFragment, toElement) {
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for (const childNode of fromFragment.childNodes) {
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if (childNode.nodeType === childNode.TEXT_NODE) {
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// Keep the translated text node.
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continue;
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}
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if (childNode.hasAttribute("data-l10n-name")) {
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const sanitized = namedChildFrom(toElement, childNode);
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fromFragment.replaceChild(sanitized, childNode);
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continue;
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}
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if (isElementAllowed(childNode)) {
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const sanitized = allowedChild(childNode);
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fromFragment.replaceChild(sanitized, childNode);
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continue;
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}
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console.warn(
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`An element of forbidden type "${childNode.localName}" was found in ` +
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"the translation. Only safe text-level elements and elements with " +
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"data-l10n-name are allowed."
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);
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// If all else fails, replace the element with its text content.
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fromFragment.replaceChild(textNode(childNode), childNode);
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}
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toElement.textContent = "";
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toElement.appendChild(fromFragment);
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}
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/**
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* Transplant localizable attributes of an element to another element.
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*
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* Any localizable attributes already set on the target element will be
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* cleared.
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*
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* @param {Element|Object} fromElement - The source of child nodes to overlay.
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* @param {Element} toElement - The target of the overlay.
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* @private
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*/
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function overlayAttributes(fromElement, toElement) {
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const explicitlyAllowed = toElement.hasAttribute("data-l10n-attrs")
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? toElement.getAttribute("data-l10n-attrs")
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.split(",").map(i => i.trim())
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: null;
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// Remove existing localizable attributes.
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for (const attr of Array.from(toElement.attributes)) {
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if (isAttrNameLocalizable(attr.name, toElement, explicitlyAllowed)) {
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toElement.removeAttribute(attr.name);
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}
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}
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// fromElement might be a {value, attributes} object as returned by
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// Localization.messageFromContext. In which case attributes may be null to
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// save GC cycles.
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if (!fromElement.attributes) {
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return;
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}
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// Set localizable attributes.
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for (const attr of Array.from(fromElement.attributes)) {
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if (isAttrNameLocalizable(attr.name, toElement, explicitlyAllowed)) {
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toElement.setAttribute(attr.name, attr.value);
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}
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}
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}
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/**
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* Sanitize a child element created by the translation.
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*
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* Try to find a corresponding child in sourceElement and use it as the base
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* for the sanitization. This will preserve functional attribtues defined on
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* the child element in the source HTML.
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*
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* @param {Element} sourceElement - The source for data-l10n-name lookups.
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* @param {Element} translatedChild - The translated child to be sanitized.
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* @returns {Element}
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* @private
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*/
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function namedChildFrom(sourceElement, translatedChild) {
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const childName = translatedChild.getAttribute("data-l10n-name");
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const sourceChild = sourceElement.querySelector(
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`[data-l10n-name="${childName}"]`
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);
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if (!sourceChild) {
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console.warn(
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`An element named "${childName}" wasn't found in the source.`
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);
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return textNode(translatedChild);
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}
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if (sourceChild.localName !== translatedChild.localName) {
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console.warn(
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`An element named "${childName}" was found in the translation ` +
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`but its type ${translatedChild.localName} didn't match the ` +
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`element found in the source (${sourceChild.localName}).`
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);
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return textNode(translatedChild);
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}
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// Remove it from sourceElement so that the translation cannot use
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// the same reference name again.
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sourceElement.removeChild(sourceChild);
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// We can't currently guarantee that a translation won't remove
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// sourceChild from the element completely, which could break the app if
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// it relies on an event handler attached to the sourceChild. Let's make
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// this limitation explicit for now by breaking the identitiy of the
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// sourceChild by cloning it. This will destroy all event handlers
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// attached to sourceChild via addEventListener and via on<name>
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// properties.
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const clone = sourceChild.cloneNode(false);
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return shallowPopulateUsing(translatedChild, clone);
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}
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/**
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* Sanitize an allowed element.
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*
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* Text-level elements allowed in translations may only use safe attributes
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* and will have any nested markup stripped to text content.
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*
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* @param {Element} element - The element to be sanitized.
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* @returns {Element}
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* @private
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*/
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function allowedChild(element) {
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// Start with an empty element of the same type to remove nested children
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// and non-localizable attributes defined by the translation.
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const clone = element.ownerDocument.createElement(element.localName);
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return shallowPopulateUsing(element, clone);
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}
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/**
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* Convert an element to a text node.
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*
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* @param {Element} element - The element to be sanitized.
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* @returns {Node}
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* @private
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*/
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function textNode(element) {
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return element.ownerDocument.createTextNode(element.textContent);
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}
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/**
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* Check if element is allowed in the translation.
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*
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* This method is used by the sanitizer when the translation markup contains
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* an element which is not present in the source code.
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*
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* @param {Element} element
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* @returns {boolean}
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* @private
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*/
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function isElementAllowed(element) {
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const allowed = TEXT_LEVEL_ELEMENTS[element.namespaceURI];
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return allowed && allowed.includes(element.localName);
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}
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/**
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* Check if attribute is allowed for the given element.
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*
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* This method is used by the sanitizer when the translation markup contains
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* DOM attributes, or when the translation has traits which map to DOM
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* attributes.
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*
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* `explicitlyAllowed` can be passed as a list of attributes explicitly
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* allowed on this element.
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*
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* @param {string} name
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* @param {Element} element
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* @param {Array} explicitlyAllowed
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* @returns {boolean}
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* @private
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*/
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function isAttrNameLocalizable(name, element, explicitlyAllowed = null) {
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if (explicitlyAllowed && explicitlyAllowed.includes(name)) {
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return true;
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}
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const allowed = LOCALIZABLE_ATTRIBUTES[element.namespaceURI];
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if (!allowed) {
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return false;
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}
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const attrName = name.toLowerCase();
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const elemName = element.localName;
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// Is it a globally safe attribute?
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if (allowed.global.includes(attrName)) {
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return true;
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}
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// Are there no allowed attributes for this element?
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if (!allowed[elemName]) {
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return false;
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}
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// Is it allowed on this element?
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if (allowed[elemName].includes(attrName)) {
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return true;
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}
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// Special case for value on HTML inputs with type button, reset, submit
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if (element.namespaceURI === "http://www.w3.org/1999/xhtml" &&
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elemName === "input" && attrName === "value") {
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const type = element.type.toLowerCase();
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if (type === "submit" || type === "button" || type === "reset") {
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return true;
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}
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}
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return false;
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}
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/**
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* Helper to set textContent and localizable attributes on an element.
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*
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* @param {Element} fromElement
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* @param {Element} toElement
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* @returns {Element}
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* @private
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*/
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function shallowPopulateUsing(fromElement, toElement) {
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toElement.textContent = fromElement.textContent;
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overlayAttributes(fromElement, toElement);
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return toElement;
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}
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/**
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* Sanitizes a translation before passing them to Node.localize API.
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*
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* It returns `false` if the translation contains DOM Overlays and should
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* not go into Node.localize.
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*
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* Note: There's a third item of work that JS DOM Overlays do - removal
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* of attributes from the previous translation.
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* This is not trivial to implement for Node.localize scenario, so
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* at the moment it is not supported.
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*
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* @param {{
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* localName: string,
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* namespaceURI: string,
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* type: string || null
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* l10nId: string,
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* l10nArgs: Array<Object> || null,
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* l10nAttrs: string ||null,
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* }} l10nItems
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* @param {{value: string, attrs: Object}} translations
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* @returns boolean
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* @private
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*/
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function sanitizeTranslationForNodeLocalize(l10nItem, translation) {
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if (reOverlay.test(translation.value)) {
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return false;
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}
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if (translation.attributes) {
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const explicitlyAllowed = l10nItem.l10nAttrs === null ? null :
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l10nItem.l10nAttrs.split(",").map(i => i.trim());
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for (const [j, {name}] of translation.attributes.entries()) {
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if (!isAttrNameLocalizable(name, l10nItem, explicitlyAllowed)) {
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translation.attributes.splice(j, 1);
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}
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}
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}
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return true;
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}
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const L10NID_ATTR_NAME = "data-l10n-id";
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const L10NARGS_ATTR_NAME = "data-l10n-args";
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const L10N_ELEMENT_QUERY = `[${L10NID_ATTR_NAME}]`;
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/**
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* The `DOMLocalization` class is responsible for fetching resources and
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* formatting translations.
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*
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* It implements the fallback strategy in case of errors encountered during the
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* formatting of translations and methods for observing DOM
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* trees with a `MutationObserver`.
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*/
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class DOMLocalization extends Localization {
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/**
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* @param {Window} windowElement
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* @param {Array<String>} resourceIds - List of resource IDs
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* @param {Function} generateMessages - Function that returns a
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* generator over MessageContexts
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* @returns {DOMLocalization}
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*/
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constructor(windowElement, resourceIds, generateMessages) {
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super(resourceIds, generateMessages);
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// A Set of DOM trees observed by the `MutationObserver`.
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this.roots = new Set();
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// requestAnimationFrame handler.
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this.pendingrAF = null;
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// list of elements pending for translation.
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this.pendingElements = new Set();
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this.windowElement = windowElement;
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this.mutationObserver = new windowElement.MutationObserver(
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mutations => this.translateMutations(mutations)
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);
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this.observerConfig = {
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attribute: true,
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characterData: false,
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childList: true,
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subtree: true,
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attributeFilter: [L10NID_ATTR_NAME, L10NARGS_ATTR_NAME]
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};
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}
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onChange() {
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super.onChange();
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this.translateRoots();
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}
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/**
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* Set the `data-l10n-id` and `data-l10n-args` attributes on DOM elements.
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* FluentDOM makes use of mutation observers to detect changes
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* to `data-l10n-*` attributes and translate elements asynchronously.
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* `setAttributes` is a convenience method which allows to translate
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* DOM elements declaratively.
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*
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* You should always prefer to use `data-l10n-id` on elements (statically in
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* HTML or dynamically via `setAttributes`) over manually retrieving
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* translations with `format`. The use of attributes ensures that the
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* elements can be retranslated when the user changes their language
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* preferences.
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*
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* ```javascript
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* localization.setAttributes(
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* document.querySelector('#welcome'), 'hello', { who: 'world' }
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* );
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* ```
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*
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* This will set the following attributes on the `#welcome` element.
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* The MutationObserver will pick up this change and will localize the element
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* asynchronously.
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*
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* ```html
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* <p id='welcome'
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* data-l10n-id='hello'
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* data-l10n-args='{"who": "world"}'>
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* </p>
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* ```
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*
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* @param {Element} element - Element to set attributes on
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* @param {string} id - l10n-id string
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* @param {Object<string, string>} args - KVP list of l10n arguments
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* @returns {Element}
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*/
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setAttributes(element, id, args) {
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element.setAttribute(L10NID_ATTR_NAME, id);
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if (args) {
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element.setAttribute(L10NARGS_ATTR_NAME, JSON.stringify(args));
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} else {
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element.removeAttribute(L10NARGS_ATTR_NAME);
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}
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return element;
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}
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/**
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* Get the `data-l10n-*` attributes from DOM elements.
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*
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* ```javascript
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* localization.getAttributes(
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* document.querySelector('#welcome')
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* );
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* // -> { id: 'hello', args: { who: 'world' } }
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* ```
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*
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* @param {Element} element - HTML element
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* @returns {{id: string, args: Object}}
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*/
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getAttributes(element) {
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return {
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id: element.getAttribute(L10NID_ATTR_NAME),
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args: JSON.parse(element.getAttribute(L10NARGS_ATTR_NAME) || null)
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};
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}
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/**
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* Add `newRoot` to the list of roots managed by this `DOMLocalization`.
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*
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* Additionally, if this `DOMLocalization` has an observer, start observing
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* `newRoot` in order to translate mutations in it.
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*
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* @param {Element} newRoot - Root to observe.
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*/
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connectRoot(newRoot) {
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for (const root of this.roots) {
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if (root === newRoot ||
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root.contains(newRoot) ||
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newRoot.contains(root)) {
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throw new Error("Cannot add a root that overlaps with existing root.");
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}
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}
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this.roots.add(newRoot);
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this.mutationObserver.observe(newRoot, this.observerConfig);
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}
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/**
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* Remove `root` from the list of roots managed by this `DOMLocalization`.
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*
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* Additionally, if this `DOMLocalization` has an observer, stop observing
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* `root`.
|
|
*
|
|
* Returns `true` if the root was the last one managed by this
|
|
* `DOMLocalization`.
|
|
*
|
|
* @param {Element} root - Root to disconnect.
|
|
* @returns {boolean}
|
|
*/
|
|
disconnectRoot(root) {
|
|
this.roots.delete(root);
|
|
// Pause and resume the mutation observer to stop observing `root`.
|
|
this.pauseObserving();
|
|
this.resumeObserving();
|
|
|
|
return this.roots.size === 0;
|
|
}
|
|
|
|
/**
|
|
* Translate all roots associated with this `DOMLocalization`.
|
|
*
|
|
* @returns {Promise}
|
|
*/
|
|
translateRoots() {
|
|
const roots = Array.from(this.roots);
|
|
return Promise.all(
|
|
roots.map(root => this.translateFragment(root))
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Pauses the `MutationObserver`.
|
|
*
|
|
* @private
|
|
*/
|
|
pauseObserving() {
|
|
this.translateMutations(this.mutationObserver.takeRecords());
|
|
this.mutationObserver.disconnect();
|
|
}
|
|
|
|
/**
|
|
* Resumes the `MutationObserver`.
|
|
*
|
|
* @private
|
|
*/
|
|
resumeObserving() {
|
|
for (const root of this.roots) {
|
|
this.mutationObserver.observe(root, this.observerConfig);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Translate mutations detected by the `MutationObserver`.
|
|
*
|
|
* @private
|
|
*/
|
|
translateMutations(mutations) {
|
|
for (const mutation of mutations) {
|
|
switch (mutation.type) {
|
|
case "attributes":
|
|
if (mutation.target.hasAttribute("data-l10n-id")) {
|
|
this.pendingElements.add(mutation.target);
|
|
}
|
|
break;
|
|
case "childList":
|
|
for (const addedNode of mutation.addedNodes) {
|
|
if (addedNode.nodeType === addedNode.ELEMENT_NODE) {
|
|
if (addedNode.childElementCount) {
|
|
for (const element of this.getTranslatables(addedNode)) {
|
|
this.pendingElements.add(element);
|
|
}
|
|
} else if (addedNode.hasAttribute(L10NID_ATTR_NAME)) {
|
|
this.pendingElements.add(addedNode);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
// This fragment allows us to coalesce all pending translations
|
|
// into a single requestAnimationFrame.
|
|
if (this.pendingElements.size > 0) {
|
|
if (this.pendingrAF === null) {
|
|
this.pendingrAF = this.windowElement.requestAnimationFrame(() => {
|
|
// We need to filter for elements that lost their l10n-id while
|
|
// waiting for the animation frame.
|
|
this.translateElements(Array.from(this.pendingElements)
|
|
.filter(elem => elem.hasAttribute("data-l10n-id")));
|
|
this.pendingElements.clear();
|
|
this.pendingrAF = null;
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Translate a DOM element or fragment asynchronously using this
|
|
* `DOMLocalization` object.
|
|
*
|
|
* Manually trigger the translation (or re-translation) of a DOM fragment.
|
|
* Use the `data-l10n-id` and `data-l10n-args` attributes to mark up the DOM
|
|
* with information about which translations to use.
|
|
*
|
|
* Returns a `Promise` that gets resolved once the translation is complete.
|
|
*
|
|
* @param {DOMFragment} frag - Element or DocumentFragment to be translated
|
|
* @returns {Promise}
|
|
*/
|
|
translateFragment(frag) {
|
|
if (frag.localize) {
|
|
// This is a temporary fast-path offered by Gecko to workaround performance
|
|
// issues coming from Fluent and XBL+Stylo performing unnecesary
|
|
// operations during startup.
|
|
// For details see bug 1441037, bug 1442262, and bug 1363862.
|
|
|
|
// A sparse array which will store translations separated out from
|
|
// all translations that is needed for DOM Overlay.
|
|
const overlayTranslations = [];
|
|
|
|
const getTranslationsForItems = async l10nItems => {
|
|
const keys = l10nItems.map(
|
|
l10nItem => ({id: l10nItem.l10nId, args: l10nItem.l10nArgs}));
|
|
const translations = await this.formatMessages(keys);
|
|
|
|
// Here we want to separate out elements that require DOM Overlays.
|
|
// Those elements will have to be translated using our JS
|
|
// implementation, while everything else is going to use the fast-path.
|
|
for (const [i, translation] of translations.entries()) {
|
|
if (translation === undefined) {
|
|
continue;
|
|
}
|
|
|
|
const hasOnlyText =
|
|
sanitizeTranslationForNodeLocalize(l10nItems[i], translation);
|
|
if (!hasOnlyText) {
|
|
// Removing from translations to make Node.localize skip it.
|
|
// We will translate it below using JS DOM Overlays.
|
|
overlayTranslations[i] = translations[i];
|
|
translations[i] = undefined;
|
|
}
|
|
}
|
|
|
|
// We pause translation observing here because Node.localize
|
|
// will translate the whole DOM next, using the `translations`.
|
|
//
|
|
// The observer will be resumed after DOM Overlays are localized
|
|
// in the next microtask.
|
|
this.pauseObserving();
|
|
return translations;
|
|
};
|
|
|
|
return frag.localize(getTranslationsForItems.bind(this))
|
|
.then(untranslatedElements => {
|
|
for (let i = 0; i < overlayTranslations.length; i++) {
|
|
if (overlayTranslations[i] !== undefined &&
|
|
untranslatedElements[i] !== undefined) {
|
|
translateElement(untranslatedElements[i], overlayTranslations[i]);
|
|
}
|
|
}
|
|
this.resumeObserving();
|
|
})
|
|
.catch(e => {
|
|
this.resumeObserving();
|
|
throw e;
|
|
});
|
|
}
|
|
return this.translateElements(this.getTranslatables(frag));
|
|
}
|
|
|
|
/**
|
|
* Translate a list of DOM elements asynchronously using this
|
|
* `DOMLocalization` object.
|
|
*
|
|
* Manually trigger the translation (or re-translation) of a list of elements.
|
|
* Use the `data-l10n-id` and `data-l10n-args` attributes to mark up the DOM
|
|
* with information about which translations to use.
|
|
*
|
|
* Returns a `Promise` that gets resolved once the translation is complete.
|
|
*
|
|
* @param {Array<Element>} elements - List of elements to be translated
|
|
* @returns {Promise}
|
|
*/
|
|
async translateElements(elements) {
|
|
if (!elements.length) {
|
|
return undefined;
|
|
}
|
|
|
|
const keys = elements.map(this.getKeysForElement);
|
|
const translations = await this.formatMessages(keys);
|
|
return this.applyTranslations(elements, translations);
|
|
}
|
|
|
|
/**
|
|
* Applies translations onto elements.
|
|
*
|
|
* @param {Array<Element>} elements
|
|
* @param {Array<Object>} translations
|
|
* @private
|
|
*/
|
|
applyTranslations(elements, translations) {
|
|
this.pauseObserving();
|
|
|
|
for (let i = 0; i < elements.length; i++) {
|
|
if (translations[i] !== undefined) {
|
|
translateElement(elements[i], translations[i]);
|
|
}
|
|
}
|
|
|
|
this.resumeObserving();
|
|
}
|
|
|
|
/**
|
|
* Collects all translatable child elements of the element.
|
|
*
|
|
* @param {Element} element
|
|
* @returns {Array<Element>}
|
|
* @private
|
|
*/
|
|
getTranslatables(element) {
|
|
const nodes = Array.from(element.querySelectorAll(L10N_ELEMENT_QUERY));
|
|
|
|
if (typeof element.hasAttribute === "function" &&
|
|
element.hasAttribute(L10NID_ATTR_NAME)) {
|
|
nodes.push(element);
|
|
}
|
|
|
|
return nodes;
|
|
}
|
|
|
|
/**
|
|
* Get the `data-l10n-*` attributes from DOM elements as a two-element
|
|
* array.
|
|
*
|
|
* @param {Element} element
|
|
* @returns {Object}
|
|
* @private
|
|
*/
|
|
getKeysForElement(element) {
|
|
return {
|
|
id: element.getAttribute(L10NID_ATTR_NAME),
|
|
args: JSON.parse(element.getAttribute(L10NARGS_ATTR_NAME) || null)
|
|
};
|
|
}
|
|
}
|
|
|
|
this.DOMLocalization = DOMLocalization;
|
|
var EXPORTED_SYMBOLS = ["DOMLocalization"];
|