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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Shared util methods between api.js and api_implementation.js
* for doing common tasks such as passing node references between page script
* and ChromeVox.
*/
if (typeof(goog) != 'undefined' && goog.provide){
goog.provide('cvox.ApiUtil');
}
if (!window['cvox']) {
window['cvox'] = {};
}
/**
* @constructor
*/
cvox.ApiUtils = function() {
};
/**
* The next id to use for the cvoxid attribute that we add to elements
* in order to be able to find them from the content script.
* @type {number}
*/
cvox.ApiUtils.nextCvoxId_ = 1;
/**
* Makes a serializable reference to a node.
* If the node or its parent has an ID, reference it directly. Otherwise,
* add a temporary cvoxid attribute. This has a corresponding method in
* api_implementation.js to decode this and return a node.
* @param {Node} targetNode The node to reference.
* @return {Object} A serializable node reference.
*/
cvox.ApiUtils.makeNodeReference = function(targetNode) {
if (targetNode.id && document.getElementById(targetNode.id) == targetNode) {
return {'id': targetNode.id};
} else if (targetNode instanceof HTMLElement) {
var cvoxid = cvox.ApiUtils.nextCvoxId_;
targetNode.setAttribute('cvoxid', cvoxid);
cvox.ApiUtils.nextCvoxId_ = (cvox.ApiUtils.nextCvoxId_ + 1) % 100;
return {'cvoxid': cvoxid};
} else if (targetNode.parentElement) {
var parent = targetNode.parentElement;
var childIndex = -1;
for (var i = 0; i < parent.childNodes.length; i++) {
if (parent.childNodes[i] == targetNode) {
childIndex = i;
break;
}
}
if (childIndex >= 0) {
var cvoxid = cvox.ApiUtils.nextCvoxId_;
parent.setAttribute('cvoxid', cvoxid);
cvox.ApiUtils.nextCvoxId_ = (cvox.ApiUtils.nextCvoxId_ + 1) % 100;
return {'cvoxid': cvoxid, 'childIndex': childIndex};
}
}
throw 'Cannot reference node: ' + targetNode;
};
/**
* Retrieves a node from its serializable node reference.
*
* @param {Object} nodeRef A serializable reference to a node.
* @return {Node} The node on the page that this object refers to.
*/
cvox.ApiUtils.getNodeFromRef = function(nodeRef) {
if (nodeRef['id']) {
return document.getElementById(nodeRef['id']);
} else if (nodeRef['cvoxid']) {
var selector = '*[cvoxid="' + nodeRef['cvoxid'] + '"]';
var element = document.querySelector(selector);
if (element && element.removeAttribute) {
element.removeAttribute('cvoxid');
}
if (nodeRef['childIndex'] != null) {
return element.childNodes[nodeRef['childIndex']];
} else {
return element;
}
}
throw 'Bad node reference: ' + cvox.ChromeVoxJSON.stringify(nodeRef);
};
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