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PODetermining Source Line and File of function reference - How does Firebug do it?
 

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  1. PODetermining Source Line and File of function reference - How does Firebug do it?
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    <p>Brief introduction:</p> <p>I'm attempting to get at line number of function definition for parsing documentation comments on only public stuff. I've gotten to the point where I can find the name of the function and if I so wanted I could execute the function, but I can't seem to figure out any way to pull out line number information. Note: this is purely for documentation purposes so cross-browser isn't necessary.</p> <p>I know firebug (but not firebug lite so I don't know how possible this is) shows you the line number and script location of a referenced function on mouseover. I looked through the firebug source and got as far as finding they call (<code>domPanel.js:536</code>), but can't seem to find this "addMember" function anywhere in their source:</p> <pre><code>this.addMember(object, "userFunction", userFuncs, name, val, level, 0, context); </code></pre> <p>It may be that this just isn't possible to determine. My fallbacks are using <code>[userfunction].name</code> and <code>[userfunction].toSource()</code> and then attempt to match source to source. But I would like to avoid these if possible since the name could be non-unique and the toSource() gives the source post-processing. Maybe there is a way to tie into the firebug api?</p> <p>Minimal Explanation Code:</p> <p>[Note the goal would be to get this information: <code>window.MyWindowObject.PublicFunction: script.js line 3</code>]</p> <p>script.js</p> <pre><code>(function () { function referencedFunction() { ///&lt;summary&gt;Sample XML Doc Comment&lt;/summary&gt; alert('well hello there!'); } var publicObject = window.MyWindowObject || {}; publicObject.PublicFunction = referencedFunction; window.MyWindowObject = publicObject; }()); </code></pre> <p>index.htm</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;script src="script.js"&gt;&lt;/script&gt; &lt;/html&gt; </code></pre> <p>EDIT: for anyone who finds this on a search later here is some other useful related info that I've found:</p> <p>Stacktrace.js: <a href="https://github.com/eriwen/javascript-stacktrace" rel="noreferrer">https://github.com/eriwen/javascript-stacktrace</a> - Pretty close but not quite what I want since it doesn't seem to get the final function's location. The example on their website is not correct (though the demo "looks" like what I wanted)</p> <p>In chrome (and IE9): <code>[userfunction].toString()</code> preserves comments (does not in firefox), which is what I will probably end up using. I was going to use firefox's <code>[userfunction]</code>.toSource() but this looks like browser-manipulated source of the function. firefox's <code>[userfunction]</code>.toString() appears to preserve code, but strips comments</p>
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    1. USAnthony Sottile
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    1. CONot sure, but I think Firebug hooks directly into FF's javascript interpreter - something you can't do without building a browser extension.
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      1. USFlambino
    2. CO@Flambino has it right: Firebug has special access to stuff like this thanks to it being a browser plugin. If you need proof of this, look at Firebug Lite, which runs as plain Javascript-in-the-browser; it doesn't have a JS debugger feature because that can't be done without the privileges it gets from being a plug-in. (the Firebug Lite documentation actually states this explicitly)
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      1. USSpudley
    3. CO@Spudley: I noted in my question I've already looked at firebug lite and understand the limitations of javascript but was still asking whether there is any way to do this. I was thinking maybe something with forcing exceptions since in some browsers stack traces include the information I am looking for, but I have not found any solution yet so therefore the question.
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      1. USAnthony Sottile
 

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