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Provide the option to override keys on an object when creating a wrapper

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This commit is contained in:
Simon Kornblith 2012-04-08 22:38:59 -04:00
parent 9074c09cc3
commit 77ea5bf3f9
1 changed files with 14 additions and 12 deletions
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26
chrome/content/zotero/xpcom/translation/translate_firefox.js
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@ -36,8 +36,7 @@ const BOMs = {
Components.utils.import("resource://gre/modules/NetUtil.jsm");
Zotero.Translate.DOMWrapper = new function() {
Zotero.Translate.DOMWrapper = new function() {
/*
* BEGIN SPECIAL POWERS WRAPPING CODE
* https://mxr.mozilla.org/mozilla-central/source/testing/mochitest/tests/SimpleTest/specialpowersAPI.js?raw=1
@ -66,7 +65,7 @@ Zotero.Translate.DOMWrapper = new function() {
return Function.prototype.apply.call(fun, invocant, args);
}
function wrapPrivileged(obj) {
function wrapPrivileged(obj, overrides) {
// Primitives pass straight through.
if (!isWrappable(obj))
@ -77,7 +76,7 @@ Zotero.Translate.DOMWrapper = new function() {
throw "Trying to double-wrap object!";
// Make our core wrapper object.
var handler = new SpecialPowersHandler(obj);
var handler = new SpecialPowersHandler(obj, overrides);
// If the object is callable, make a function proxy.
if (typeof obj === "function") {
@ -136,8 +135,9 @@ Zotero.Translate.DOMWrapper = new function() {
};
function SpecialPowersHandler(obj) {
function SpecialPowersHandler(obj, overrides) {
this.wrappedObject = obj;
this.overrides = overrides ? overrides : {};
};
// Allow us to transitively maintain the membrane by wrapping descriptors
@ -163,11 +163,14 @@ Zotero.Translate.DOMWrapper = new function() {
// Note that we have several cases here, each of which requires special handling.
//
var desc;
// Hack for overriding some properties
if (name in this.overrides)
return this.overrides[name];
// Case 1: Own Properties.
//
// This one is easy, thanks to Object.getOwnPropertyDescriptor().
if (own)
else if (own)
desc = Object.getOwnPropertyDescriptor(obj, name);
// Case 2: Not own, not Xray-wrapped.
@ -251,9 +254,11 @@ Zotero.Translate.DOMWrapper = new function() {
var specialAPI = 'SpecialPowers_wrappedObject';
if (props.indexOf(specialAPI) == -1)
props.push(specialAPI);
// Do the normal thing.
var flt = function(a) { return props.indexOf(a) == -1; };
props = props.concat(Object.keys(this.overrides).filter(flt));
props = props.concat(Object.getOwnPropertyNames(obj).filter(flt));
// If we've got an Xray wrapper, include the expandos as well.
@ -317,10 +322,7 @@ Zotero.Translate.DOMWrapper = new function() {
* @param {XPCCrossOriginWrapper} obj
* @return {Object} An obj that is no longer Xrayed
*/
this.wrap = function(obj) {
var newObj = wrapPrivileged(obj);
return newObj;
}
this.wrap = wrapPrivileged;
/**
* Unwraps an object