mirror of
https://github.com/classilla/tenfourfox.git
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681 lines
23 KiB
JavaScript
681 lines
23 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const {classes: Cc, interfaces: Ci, utils: Cu} = Components;
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this.EXPORTED_SYMBOLS = [ "TranslationDocument" ];
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const SHOW_ELEMENT = Ci.nsIDOMNodeFilter.SHOW_ELEMENT;
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const SHOW_TEXT = Ci.nsIDOMNodeFilter.SHOW_TEXT;
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const TEXT_NODE = Ci.nsIDOMNode.TEXT_NODE;
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Cu.import("resource://services-common/utils.js");
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Cu.import("resource://gre/modules/Task.jsm");
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/**
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* This class represents a document that is being translated,
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* and it is responsible for parsing the document,
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* generating the data structures translation (the list of
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* translation items and roots), and managing the original
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* and translated texts on the translation items.
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*
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* @param document The document to be translated
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*/
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this.TranslationDocument = function(document) {
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this.itemsMap = new Map();
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this.roots = [];
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this._init(document);
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};
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this.TranslationDocument.prototype = {
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translatedFrom: "",
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translatedTo: "",
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translationError: false,
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originalShown: true,
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/**
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* Initializes the object and populates
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* the roots lists.
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*
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* @param document The document to be translated
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*/
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_init: function(document) {
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let window = document.defaultView;
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let winUtils = window.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDOMWindowUtils);
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// Get all the translation nodes in the document's body:
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// a translation node is a node from the document which
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// contains useful content for translation, and therefore
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// must be included in the translation process.
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let nodeList = winUtils.getTranslationNodes(document.body);
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let length = nodeList.length;
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for (let i = 0; i < length; i++) {
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let node = nodeList.item(i);
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let isRoot = nodeList.isTranslationRootAtIndex(i);
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// Create a TranslationItem object for this node.
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// This function will also add it to the this.roots array.
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this._createItemForNode(node, i, isRoot);
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}
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// At first all roots are stored in the roots list, and only after
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// the process has finished we're able to determine which roots are
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// simple, and which ones are not.
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// A simple root is defined by a root with no children items, which
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// basically represents an element from a page with only text content
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// inside.
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// This distinction is useful for optimization purposes: we treat a
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// simple root as plain-text in the translation process and with that
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// we are able to reduce their data payload sent to the translation service.
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for (let root of this.roots) {
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if (root.children.length == 0 &&
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root.nodeRef.childElementCount == 0) {
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root.isSimpleRoot = true;
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}
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}
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},
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/**
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* Creates a TranslationItem object, which should be called
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* for each node returned by getTranslationNodes.
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*
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* @param node The DOM node for this item.
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* @param id A unique, numeric id for this item.
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* @parem isRoot A boolean saying whether this item is a root.
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*
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* @returns A TranslationItem object.
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*/
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_createItemForNode: function(node, id, isRoot) {
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if (this.itemsMap.has(node)) {
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return this.itemsMap.get(node);
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}
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let item = new TranslationItem(node, id, isRoot);
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if (isRoot) {
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// Root items do not have a parent item.
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this.roots.push(item);
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} else {
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let parentItem = this.itemsMap.get(node.parentNode);
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if (parentItem) {
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parentItem.children.push(item);
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}
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}
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this.itemsMap.set(node, item);
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return item;
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},
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/**
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* Generate the text string that represents a TranslationItem object.
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* Besides generating the string, it's also stored in the "original"
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* field of the TranslationItem object, which needs to be stored for
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* later to be used in the "Show Original" functionality.
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* If this function had already been called for the given item (determined
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* by the presence of the "original" array in the item), the text will
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* be regenerated from the "original" data instead of from the related
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* DOM nodes (because the nodes might contain translated data).
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*
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* @param item A TranslationItem object
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*
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* @returns A string representation of the TranslationItem.
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*/
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generateTextForItem: function(item) {
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if (item.original) {
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return regenerateTextFromOriginalHelper(item);
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}
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if (item.isSimpleRoot) {
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let text = item.nodeRef.firstChild.nodeValue.trim();
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item.original = [text];
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return text;
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}
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let str = "";
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item.original = [];
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let wasLastItemPlaceholder = false;
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for (let child of item.nodeRef.childNodes) {
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if (child.nodeType == TEXT_NODE) {
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let x = child.nodeValue.trim();
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if (x != "") {
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item.original.push(x);
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str += x;
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wasLastItemPlaceholder = false;
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}
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continue;
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}
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let objInMap = this.itemsMap.get(child);
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if (objInMap && !objInMap.isRoot) {
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// If this childNode is present in the itemsMap, it means
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// it's a translation node: it has useful content for translation.
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// In this case, we need to stringify this node.
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// However, if this item is a root, we should skip it here in this
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// object's child list (and just add a placeholder for it), because
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// it will be stringfied separately for being a root.
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item.original.push(objInMap);
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str += this.generateTextForItem(objInMap);
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wasLastItemPlaceholder = false;
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} else {
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// Otherwise, if this node doesn't contain any useful content,
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// or if it is a root itself, we can replace it with a placeholder node.
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// We can't simply eliminate this node from our string representation
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// because that could change the HTML structure (e.g., it would
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// probably merge two separate text nodes).
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// It's not necessary to add more than one placeholder in sequence;
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// we can optimize them away.
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if (!wasLastItemPlaceholder) {
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item.original.push(TranslationItem_NodePlaceholder);
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str += '<br>';
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wasLastItemPlaceholder = true;
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}
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}
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}
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return generateTranslationHtmlForItem(item, str);
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},
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/**
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* Changes the document to display its translated
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* content.
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*/
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showTranslation: function() {
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this.originalShown = false;
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this._swapDocumentContent("translation");
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},
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/**
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* Changes the document to display its original
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* content.
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*/
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showOriginal: function() {
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this.originalShown = true;
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this._swapDocumentContent("original");
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},
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/**
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* Swap the document with the resulting translation,
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* or back with the original content.
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*
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* @param target A string that is either "translation"
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* or "original".
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*/
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_swapDocumentContent: function(target) {
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Task.spawn(function *() {
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// Let the event loop breath on every 100 nodes
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// that are replaced.
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const YIELD_INTERVAL = 100;
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let count = YIELD_INTERVAL;
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for (let root of this.roots) {
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root.swapText(target);
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if (count-- == 0) {
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count = YIELD_INTERVAL;
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yield CommonUtils.laterTickResolvingPromise();
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}
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}
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}.bind(this));
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}
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};
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/**
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* This class represents an item for translation. It's basically our
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* wrapper class around a node returned by getTranslationNode, with
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* more data and structural information on it.
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*
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* At the end of the translation process, besides the properties below,
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* a TranslationItem will contain two other properties: one called "original"
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* and one called "translation". They are twin objects, one which reflect
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* the structure of that node in its original state, and the other in its
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* translated state.
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*
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* The "original" array is generated in the generateTextForItem function,
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* and the "translation" array is generated when the translation results
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* are parsed.
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*
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* They are both arrays, which contain a mix of strings and references to
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* child TranslationItems. The references in both arrays point to the * same *
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* TranslationItem object, but they might appear in different orders between the
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* "original" and "translation" arrays.
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*
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* An example:
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*
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* English: <div id="n1">Welcome to <b id="n2">Mozilla's</b> website</div>
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* Portuguese: <div id="n1">Bem vindo a pagina <b id="n2">da Mozilla</b></div>
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*
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* TranslationItem n1 = {
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* id: 1,
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* original: ["Welcome to", ptr to n2, "website"]
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* translation: ["Bem vindo a pagina", ptr to n2]
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* }
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*
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* TranslationItem n2 = {
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* id: 2,
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* original: ["Mozilla's"],
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* translation: ["da Mozilla"]
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* }
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*/
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function TranslationItem(node, id, isRoot) {
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this.nodeRef = node;
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this.id = id;
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this.isRoot = isRoot;
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this.children = [];
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}
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TranslationItem.prototype = {
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isRoot: false,
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isSimpleRoot: false,
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toString: function() {
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let rootType = this.isRoot
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? (this.isSimpleRoot ? ' (simple root)' : ' (non simple root)')
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: '';
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return "[object TranslationItem: <" + this.nodeRef.localName + ">"
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+ rootType + "]";
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},
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/**
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* This function will parse the result of the translation of one translation
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* item. If this item was a simple root, all we sent was a plain-text version
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* of it, so the result is also straightforward text.
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*
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* For non-simple roots, we sent a simplified HTML representation of that
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* node, and we'll first parse that into an HTML doc and then call the
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* parseResultNode helper function to parse it.
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*
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* While parsing, the result is stored in the "translation" field of the
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* TranslationItem, which will be used to display the final translation when
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* all items are finished. It remains stored too to allow back-and-forth
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* switching between the "Show Original" and "Show Translation" functions.
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*
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* @param result A string with the textual result received from the server,
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* which can be plain-text or a serialized HTML doc.
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*/
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parseResult: function(result) {
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if (this.isSimpleRoot) {
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this.translation = [result];
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return;
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}
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let domParser = Cc["@mozilla.org/xmlextras/domparser;1"]
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.createInstance(Ci.nsIDOMParser);
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let doc = domParser.parseFromString(result, "text/html");
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parseResultNode(this, doc.body.firstChild);
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},
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/**
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* This function finds a child TranslationItem
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* with the given id.
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* @param id The id to look for, in the format "n#"
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* @returns A TranslationItem with the given id, or null if
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* it was not found.
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*/
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getChildById: function(id) {
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for (let child of this.children) {
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if (("n" + child.id) == id) {
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return child;
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}
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}
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return null;
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},
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/**
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* Swap the text of this TranslationItem between
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* its original and translated states.
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*
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* @param target A string that is either "translation"
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* or "original".
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*/
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swapText: function(target) {
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swapTextForItem(this, target);
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}
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};
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/**
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* This object represents a placeholder item for translation. It's similar to
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* the TranslationItem class, but it represents nodes that have no meaningful
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* content for translation. These nodes will be replaced by "<br>" in a
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* translation request. It's necessary to keep them to use it as a mark
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* for correct positioning and spliting of text nodes.
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*/
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const TranslationItem_NodePlaceholder = {
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toString: function() {
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return "[object TranslationItem_NodePlaceholder]";
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}
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};
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/**
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* Generate the outer HTML representation for a given item.
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*
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* @param item A TranslationItem object.
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* param content The inner content for this item.
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* @returns string The outer HTML needed for translation
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* of this item.
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*/
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function generateTranslationHtmlForItem(item, content) {
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let localName = item.isRoot ? "div" : "b";
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return '<' + localName + ' id=n' + item.id + '>' +
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content +
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"</" + localName + ">";
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}
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/**
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* Regenerate the text string that represents a TranslationItem object,
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* with data from its "original" array. The array must have already
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* been created by TranslationDocument.generateTextForItem().
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*
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* @param item A TranslationItem object
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*
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* @returns A string representation of the TranslationItem.
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*/
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function regenerateTextFromOriginalHelper(item) {
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if (item.isSimpleRoot) {
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return item.original[0];
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}
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let str = "";
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for (let child of item.original) {
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if (child instanceof TranslationItem) {
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str += regenerateTextFromOriginalHelper(child);
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} else if (child === TranslationItem_NodePlaceholder) {
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str += "<br>";
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} else {
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str += child;
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}
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}
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return generateTranslationHtmlForItem(item, str);
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}
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/**
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* Helper function to parse a HTML doc result.
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* How it works:
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*
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* An example result string is:
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*
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* <div id="n1">Hello <b id="n2">World</b> of Mozilla.</div>
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*
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* For an element node, we look at its id and find the corresponding
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* TranslationItem that was associated with this node, and then we
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* walk down it repeating the process.
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*
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* For text nodes we simply add it as a string.
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*/
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function parseResultNode(item, node) {
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item.translation = [];
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for (let child of node.childNodes) {
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if (child.nodeType == TEXT_NODE) {
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item.translation.push(child.nodeValue);
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} else if (child.localName == "br") {
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item.translation.push(TranslationItem_NodePlaceholder);
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} else {
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let translationItemChild = item.getChildById(child.id);
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if (translationItemChild) {
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item.translation.push(translationItemChild);
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parseResultNode(translationItemChild, child);
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}
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}
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}
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}
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/**
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* Helper function to swap the text of a TranslationItem
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* between its original and translated states.
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* How it works:
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*
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* The function iterates through the target array (either the `original` or
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* `translation` array from the TranslationItem), while also keeping a pointer
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* to a current position in the child nodes from the actual DOM node that we
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* are modifying. This pointer is moved forward after each item of the array
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* is translated. If, at any given time, the pointer doesn't match the expected
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* node that was supposed to be seen, it means that the original and translated
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* contents have a different ordering, and thus we need to adjust that.
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*
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* A full example of the reordering process, swapping from Original to
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* Translation:
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*
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* Original (en): <div>I <em>miss</em> <b>you</b></div>
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*
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* Translation (fr): <div><b>Tu</b> me <em>manques</em></div>
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*
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* Step 1:
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* pointer points to firstChild of the DOM node, textnode "I "
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* first item in item.translation is [object TranslationItem <b>]
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*
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* pointer does not match the expected element, <b>. So let's move <b> to the
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* pointer position.
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*
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* Current state of the DOM:
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* <div><b>you</b>I <em>miss</em> </div>
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*
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* Step 2:
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* pointer moves forward to nextSibling, textnode "I " again.
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* second item in item.translation is the string " me "
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*
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* pointer points to a text node, and we were expecting a text node. Match!
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* just replace the text content.
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*
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* Current state of the DOM:
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* <div><b>you</b> me <em>miss</em> </div>
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*
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* Step 3:
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* pointer moves forward to nextSibling, <em>miss</em>
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* third item in item.translation is [object TranslationItem <em>]
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*
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* pointer points to the expected node. Match! Nothing to do.
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*
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* Step 4:
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* all items in this item.translation were transformed. The remaining
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* text nodes are cleared to "", and domNode.normalize() removes them.
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*
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* Current state of the DOM:
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* <div><b>you</b> me <em>miss</em></div>
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*
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* Further steps:
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* After that, the function will visit the child items (from the visitStack),
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* and the text inside the <b> and <em> nodes will be swapped as well,
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* yielding the final result:
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*
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* <div><b>Tu</b> me <em>manques</em></div>
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*
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*
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* @param item A TranslationItem object
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* @param target A string that is either "translation"
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* or "original".
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*/
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function swapTextForItem(item, target) {
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// visitStack is the stack of items that we still need to visit.
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// Let's start the process by adding the root item.
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let visitStack = [ item ];
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let source = target == "translation" ? "original" : "translation";
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while (visitStack.length > 0) {
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let curItem = visitStack.shift();
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let domNode = curItem.nodeRef;
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if (!domNode) {
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// Skipping this item due to a missing node.
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continue;
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}
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if (!curItem[target]) {
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// Translation not found for this item. This could be due to
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// an error in the server response. For example, if a translation
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// was broken in various chunks, and one of the chunks failed,
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// the items from that chunk will be missing its "translation"
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// field.
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continue;
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}
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domNode.normalize();
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// curNode points to the child nodes of the DOM node that we are
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// modifying. During most of the process, while the target array is
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// being iterated (in the for loop below), it should walk together with
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// the array and be pointing to the correct node that needs to modified.
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// If it's not pointing to it, that means some sort of node reordering
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// will be necessary to produce the correct translation.
|
|
// Note that text nodes don't need to be reordered, as we can just replace
|
|
// the content of one text node with another.
|
|
//
|
|
// curNode starts in the firstChild...
|
|
let curNode = domNode.firstChild;
|
|
|
|
// ... actually, let's make curNode start at the first useful node (either
|
|
// a non-blank text node or something else). This is not strictly necessary,
|
|
// as the reordering algorithm would correctly handle this case. However,
|
|
// this better aligns the resulting translation with the DOM content of the
|
|
// page, avoiding cases that would need to be unecessarily reordered.
|
|
//
|
|
// An example of how this helps:
|
|
//
|
|
// ---- Original: <div> <b>Hello </b> world.</div>
|
|
// ^textnode 1 ^item 1 ^textnode 2
|
|
//
|
|
// - Translation: <div><b>Hallo </b> Welt.</div>
|
|
//
|
|
// Transformation process without this optimization:
|
|
// 1 - start pointer at textnode 1
|
|
// 2 - move item 1 to first position inside the <div>
|
|
//
|
|
// Node now looks like: <div><b>Hello </b>[ ][ world.]</div>
|
|
// textnode 1^ ^textnode 2
|
|
//
|
|
// 3 - replace textnode 1 with " Welt."
|
|
// 4 - clear remaining text nodes (in this case, textnode 2)
|
|
//
|
|
// Transformation process with this optimization:
|
|
// 1 - start pointer at item 1
|
|
// 2 - item 1 is already in position
|
|
// 3 - replace textnode 2 with " Welt."
|
|
//
|
|
// which completely avoids any node reordering, and requires only one
|
|
// text change instead of two (while also leaving the page closer to
|
|
// its original state).
|
|
while (curNode &&
|
|
curNode.nodeType == TEXT_NODE &&
|
|
curNode.nodeValue.trim() == "") {
|
|
curNode = curNode.nextSibling;
|
|
}
|
|
|
|
// Now let's walk through all items in the `target` array of the
|
|
// TranslationItem. This means either the TranslationItem.original or
|
|
// TranslationItem.translation array.
|
|
for (let targetItem of curItem[target]) {
|
|
|
|
if (targetItem instanceof TranslationItem) {
|
|
// If the array element is another TranslationItem object, let's
|
|
// add it to the stack to be visited.
|
|
visitStack.push(targetItem);
|
|
|
|
let targetNode = targetItem.nodeRef;
|
|
|
|
// If the node is not in the expected position, let's reorder
|
|
// it into position...
|
|
if (curNode != targetNode &&
|
|
// ...unless the page has reparented this node under a totally
|
|
// different node (or removed it). In this case, all bets are off
|
|
// on being able to do anything correctly, so it's better not to
|
|
// bring back the node to this parent.
|
|
targetNode.parentNode == domNode) {
|
|
|
|
// We don't need to null-check curNode because insertBefore(..., null)
|
|
// does what we need in that case: reorder this node to the end
|
|
// of child nodes.
|
|
domNode.insertBefore(targetNode, curNode);
|
|
curNode = targetNode;
|
|
}
|
|
|
|
// Move pointer forward. Since we do not add empty text nodes to the
|
|
// list of translation items, we must skip them here too while
|
|
// traversing the DOM in order to get better alignment between the
|
|
// text nodes and the translation items.
|
|
if (curNode) {
|
|
curNode = getNextSiblingSkippingEmptyTextNodes(curNode);
|
|
}
|
|
|
|
} else if (targetItem === TranslationItem_NodePlaceholder) {
|
|
// If the current item is a placeholder node, we need to move
|
|
// our pointer "past" it, jumping from one side of a block of
|
|
// elements + empty text nodes to the other side. Even if
|
|
// non-placeholder elements exists inside the jumped block,
|
|
// they will be pulled correctly later in the process when the
|
|
// targetItem for those nodes are handled.
|
|
|
|
while (curNode &&
|
|
(curNode.nodeType != TEXT_NODE ||
|
|
curNode.nodeValue.trim() == "")) {
|
|
curNode = curNode.nextSibling;
|
|
}
|
|
|
|
} else {
|
|
// Finally, if it's a text item, we just need to find the next
|
|
// text node to use. Text nodes don't need to be reordered, so
|
|
// the first one found can be used.
|
|
while (curNode && curNode.nodeType != TEXT_NODE) {
|
|
curNode = curNode.nextSibling;
|
|
}
|
|
|
|
// If none was found and we reached the end of the child nodes,
|
|
// let's create a new one.
|
|
if (!curNode) {
|
|
// We don't know if the original content had a space or not,
|
|
// so the best bet is to create the text node with " " which
|
|
// will add one space at the beginning and one at the end.
|
|
curNode = domNode.appendChild(domNode.ownerDocument.createTextNode(" "));
|
|
}
|
|
|
|
// A trailing and a leading space must be preserved because
|
|
// they are meaningful in HTML.
|
|
let preSpace = /^\s/.test(curNode.nodeValue) ? " " : "";
|
|
let endSpace = /\s$/.test(curNode.nodeValue) ? " " : "";
|
|
|
|
curNode.nodeValue = preSpace + targetItem + endSpace;
|
|
curNode = getNextSiblingSkippingEmptyTextNodes(curNode);
|
|
}
|
|
}
|
|
|
|
// The translated version of a node might have less text nodes than its
|
|
// original version. If that's the case, let's clear the remaining nodes.
|
|
if (curNode) {
|
|
clearRemainingNonEmptyTextNodesFromElement(curNode);
|
|
}
|
|
|
|
// And remove any garbage "" nodes left after clearing.
|
|
domNode.normalize();
|
|
}
|
|
}
|
|
|
|
function getNextSiblingSkippingEmptyTextNodes(startSibling) {
|
|
let item = startSibling.nextSibling;
|
|
while (item &&
|
|
item.nodeType == TEXT_NODE &&
|
|
item.nodeValue.trim() == "") {
|
|
item = item.nextSibling;
|
|
}
|
|
return item;
|
|
}
|
|
|
|
function clearRemainingNonEmptyTextNodesFromElement(startSibling) {
|
|
let item = startSibling;
|
|
while (item) {
|
|
if (item.nodeType == TEXT_NODE &&
|
|
item.nodeValue != "") {
|
|
item.nodeValue = "";
|
|
}
|
|
item = item.nextSibling;
|
|
}
|
|
}
|