[webkit-help] Trouble figuring out JavaScriptCore way of getting into this JavaScript code

Alexey Proskuryakov ap at webkit.org
Sat Jul 3 12:02:00 PDT 2010

02.07.2010, в 22:58, Dan Wood написал(а):

> * Create a generic object (to be the global 'window' object) with JSObjectMake(ctx, NULL, NULL)
> * Set this object to be the property "window" of the global object with JSObjectSetProperty

less.js project page says "will be able to run directly in the browser, as well as on the server, with node.js". Assuming it's currently capable of the latter, it sounds like you need to implement whatever node.js requires from its environment, evaluate node.js, and then evaluate less.js without adding a window object. Or it could be easier to just run it in a WebView.

When window is not undefined, less.js starts using things that are only available in browser DOM, such as XMLHttpRequest or document.getElementsByTagName.

> So I'm kind of stuck.  I'm wondering if it's that mysterious wrapping around the source code that is confusing me enough to either pass in the wrong environment (e.g. a global 'window' object) or extract the results out incorrectly.

The reason JavaScript code is often wrapped this way is to avoid defining functions and variables in global scope.

I'm not sure why exactly you are not getting a "less" property added to your stub object. It seems that it should be added unless an uncaught exception were raised (and then you'd get null from JSEvaluateScript, not undefined).

In fact, I cannot replicate your results with jsc command line tool:

$ WebKitBuild/Debug/jsc
> window={}
[object Object]
> load("/Users/ap/Desktop/less-1.0.30.js");
Exception: ReferenceError: Can't find variable: location

- WBR, Alexey Proskuryakov

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