mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
125 lines
3.3 KiB
JavaScript
125 lines
3.3 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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this.EXPORTED_SYMBOLS = ["DOMHelpers"];
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/**
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* DOMHelpers
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* Makes DOM traversal easier. Goes through iframes.
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*
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* @constructor
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* @param nsIDOMWindow aWindow
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* The content window, owning the document to traverse.
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*/
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this.DOMHelpers = function DOMHelpers(aWindow) {
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this.window = aWindow;
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};
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DOMHelpers.prototype = {
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getParentObject: function Helpers_getParentObject(node)
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{
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let parentNode = node ? node.parentNode : null;
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if (!parentNode) {
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// Documents have no parentNode; Attr, Document, DocumentFragment, Entity,
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// and Notation. top level windows have no parentNode
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if (node && node == this.window.Node.DOCUMENT_NODE) {
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// document type
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if (node.defaultView) {
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let embeddingFrame = node.defaultView.frameElement;
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if (embeddingFrame)
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return embeddingFrame.parentNode;
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}
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}
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// a Document object without a parentNode or window
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return null; // top level has no parent
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}
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if (parentNode.nodeType == this.window.Node.DOCUMENT_NODE) {
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if (parentNode.defaultView) {
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return parentNode.defaultView.frameElement;
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}
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// parent is document element, but no window at defaultView.
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return null;
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}
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if (!parentNode.localName)
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return null;
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return parentNode;
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},
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getChildObject: function Helpers_getChildObject(node, index, previousSibling,
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showTextNodesWithWhitespace)
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{
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if (!node)
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return null;
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if (node.contentDocument) {
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// then the node is a frame
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if (index == 0) {
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return node.contentDocument.documentElement; // the node's HTMLElement
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}
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return null;
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}
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if (node instanceof this.window.GetSVGDocument) {
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let svgDocument = node.getSVGDocument();
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if (svgDocument) {
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// then the node is a frame
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if (index == 0) {
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return svgDocument.documentElement; // the node's SVGElement
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}
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return null;
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}
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}
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let child = null;
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if (previousSibling) // then we are walking
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child = this.getNextSibling(previousSibling);
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else
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child = this.getFirstChild(node);
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if (showTextNodesWithWhitespace)
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return child;
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for (; child; child = this.getNextSibling(child)) {
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if (!this.isWhitespaceText(child))
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return child;
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}
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return null; // we have no children worth showing.
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},
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getFirstChild: function Helpers_getFirstChild(node)
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{
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let SHOW_ALL = Components.interfaces.nsIDOMNodeFilter.SHOW_ALL;
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this.treeWalker = node.ownerDocument.createTreeWalker(node,
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SHOW_ALL, null, false);
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return this.treeWalker.firstChild();
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},
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getNextSibling: function Helpers_getNextSibling(node)
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{
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let next = this.treeWalker.nextSibling();
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if (!next)
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delete this.treeWalker;
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return next;
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},
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isWhitespaceText: function Helpers_isWhitespaceText(node)
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{
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return node.nodeType == this.window.Node.TEXT_NODE &&
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!/[^\s]/.exec(node.nodeValue);
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},
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destroy: function Helpers_destroy()
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{
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delete this.window;
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delete this.treeWalker;
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}
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};
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