XUL, XBL, JS and DOM

Writing C++ is like working out

4 Comments

I’ve just completed a first-draft, unstable, patch implementing a XPath generator in native mozilla.org code. (It is highly unstable, so unless you’re a developer willing to help fix bugs in it, don’t use it.) It’s been a marathon for me, writing a component from scratch with (until now) only peripheral experience in C++. I’m sure there are many in #developers who can attest to the large number of first-timer mistakes I’ve begged for help on.

As for the title of this blog entry, I’m pretty sure it’s accurate. First, you start off with a lot of pain. Read the “Full Article” link for a list.

Continue reading Writing C++ is like working out →

XUL, XBL, JS and DOM

Sending messages from content to chrome? (part 2)

6 Comments

A few weeks ago, bz helped me solve one of the issues blocking content-to-chrome messaging. Unfortunately, as I have just discovered, that’s not enough.

I tried giving my little nsIDOMEvent object a few JS properties from content. Little things, like a string (evt.foo = “bar”). But when the event reached my chrome event listener, that property was not available.

Whoops. I still need to figure out the solution to the original problem: getting a meaningful message across. My fault for not being clear enough in my original request

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For what it’s worth, I was making pretty good progress hacking XPathGenerator together so far. I have the revamped resolver working now. (Many, many thanks to biesi, timeless, bz and peterv for offering compile/link/crash fixes as I go along.)

UPDATE: My approach (a custom IDL + JS component) seems to be working quite nicely. When I have it fully fleshed out, I’ll try to get that part of the code released to open-source. (ManyOne probably owns the code, even if I wrote it.)

Technobabble

XPathGenerator: JavaScript or C++?

3 Comments

In designing an initial implementation of XPathGenerator, I decided I’d try first to implement it as a JavaScript-based component with a few special-case C++ functions included. The idea was to make it more generic than normal, so that converting from one language to another would be somewhat easier on my soul. The code wouldn’t have been review-ready at first, but if I could make it work in JS, it’d be relatively simple to drop the less-than-relevant portions.

There’s some wisdom to that approach now, it seems. This evening, I hit upon a new situation entirely. In executing alert(typeof JSXPathGenerator) (a test name for the component’s implemented XPathGenerator constructor), I got something I’d never seen before: a QueryInterface call with an IID that isn’t in Components.interfaces.

A little quick research and a modified dump() statement led to nsIDOMCIExtension. This defines a fair number of little macros that don’t make any sense at all until you look at the XML Extras module & factory code. Even then, it makes very little sense to me.

So, in other words, after all my initial work, it appears there’s no easy way to create a JS-based XPCOM component to deliver a constructor. Now, if someone would translate nsIDOMCIExtension’s macros into something more cross-language friendly, I wouldn’t have this problem. Or if there was a JS equivalent (I’m not in the mood to do the translation), I could keep going.

But back to the original topic. I’m trying to decide whether to pursue this in JavaScript or C++.

WeirdAl	bz: let me rephrase. I'm trying to find the path of least resistance to implementing this thing.
WeirdAl	if that path is C++, then so be it.
bz_sleep	finds all paths involving creating new components to have high resistance. ;)

So, at least for the moment, I’m in a pit. I’ll be starting over from C++ fairly soon, unless someone’s nice enough to figure out the nsIDOMCIExtension code and write some new code to support me there. At least the JS code gives me a partial mock-up to follow.

Overall, unlike my previous blog entry, I find this amusing.

Oh, one more thing: the typeof call, because of the XPCOM error, didn’t pop up any dialog at all, not even “undefined”. I have filed as bug 325707.

UPDATE: Thanks to peterv, timeless, and #developers, I’ve got a C++-based constructor component built

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XUL, XBL, JS and DOM

chrome.rdf base URL creation and contents.rdf

When I’m developing a new chrome package, I like to specify that I support both the classic and modern skins. So, in skin/contents.rdf, I would by default write:

<RDF:RDF xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:chrome="http://www.mozilla.org/rdf/chrome#">
<RDF:Seq about="urn:mozilla:skin:root">
<RDF:li resource="urn:mozilla:skin:classic/1.0"/>
<RDF:li resource="urn:mozilla:skin:modern/1.0"/>
</RDF:Seq>
<RDF:Description about="urn:mozilla:skin:classic/1.0">
<chrome:packages>
<RDF:Seq about="urn:mozilla:skin:classic/1.0:packages">
<RDF:li resource="urn:mozilla:skin:classic/1.0:xulwidgets"/>
</RDF:Seq>
</chrome:packages>
</RDF:Description>
<RDF:Description about="urn:mozilla:skin:modern/1.0">
<chrome:packages>
<RDF:Seq about="urn:mozilla:skin:modern/1.0:packages">
<RDF:li resource="urn:mozilla:skin:modern/1.0:xulwidgets"/>
</RDF:Seq>
</chrome:packages>
</RDF:Description>
</RDF:RDF>

Naturally, I keep all my skin contents under skin/, right alongside the contents.rdf file. So, for some reason, chrome://xulwidgets/skin/contents.rdf fails.

Some debugging time later, I look in dist/bin/chrome/chrome.rdf and discover the following:

  <RDF:Description RDF:about="urn:mozilla:skin:modern/1.0:xulwidgets"
c:baseURL="jar:resource:/chrome/xulwidgets.jar!/xulwidgets/skin/modern/1.0"
c:allowScripts="false">
<c:package RDF:resource="urn:mozilla:package:xulwidgets"/>
</RDF:Description>

The baseURL attribute is totally bogus. It should have been c:baseURL="jar:resource:/chrome/xulwidgets.jar!/xulwidgets/skin/". So what happened?

The code for nsChromeRegistry.cpp assumes that if I provided more than one skin package listing in the contents.rdf file, I must have provided the skins in the subdirectories. It also assumes that if I provided exactly one such entry, the skin lives in the current directory.

What annoys me about this is that it gives the package developer (me) a false impression. I can’t explicitly state I support more than one skin without having lots of duplicate files. There’s also no immediately obvious way for me to force Mozilla to accept a different base URL (say, the correct one) through contents.rdf.

This is really not cool. This is one of the issues that has bitten me again and again over the years because it’s not documented anywhere, and I finally lost my patience with it today. I remember having this problem when I first started developing Abacus, about three years ago. If there’s a better way to do this, I’d really like to know what it is

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UPDATE: I guess it would sort of make sense as currently implemented, if each individual skin had its own contents.rdf, and the install.js/rdf file referred to each individual contents.rdf file. But it’s still not nice.

Technobabble

Any Steelers/Seahawks fans in the SF Bay Area?

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Technobabble

Quick thoughts

1 Comment

  • Being sick really, really stinks. It’s 3 am; normally, I’d be fast asleep now. At the moment, I’ve slept so much that I can’t sleep all that well. Also, the prescription the doc gave me scrambles my thought processes, so I’ve avoided it for a few hours now as I seemed to be getting over the worst of this cold.
  • I know SVG in XUL documents works. I’ve been meaning to write an article for this blog about SVG in XUL applets (think images on buttons), but I haven’t figured out all the details, and I wouldn’t recommend the procedure for an end-user final application anyway

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  • I just had this crazy idea about inline SVG images in a XHTML document: being able to select the image and then clicking a button for adding float:left styling to the image, so that text runs to the right and around it. That of course brought up at least the concept for a whole toolbar of instant styling buttons, at which point my rattled biological chips went “Abort, Retry, Fail”. Oogh.
  • The Seahawks in the Super Bowl. Hallelujah.
  • I love grape juice.
  • The worst part about being sick is that it absolutely stops me cold (no pun intended) from doing anything of practical value. I can’t concentrate enough to solve problems, do any design work, or help out in testing patches on any bug that really is important. It’s frustrating, but I can’t work up enough of a rage against frustration (as I usually do) to do anything about it.
  • This is downright funny, and probably true.

Technobabble

Offline reading (and writing)

5 Comments

It’s 9:45 am on a Friday. I’m sitting on VTA’s Route 10 Flyer at Santa Clara CalTrain station, heading over to Metro/Airport Light Rail station. There is no Internet connection at all. I want to write a C++ based XPCOM component. I know extremely little about XPCOM strings, arrays or hashtables, other than they might be a good idea

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. On top of that, I’ve only glanced at “Creating XPCOM Components”, the book by Doug Turner and Ian Oeschger, and I keep thinking that’d be a very handy reference to have. Why couldn’t I just download the thing?

Ah, but I could.

The contents of www.mozilla.org are downloadable via CVS. Hooray! Now, as long as I have some idea of what I might need, I can just grab it.

The XPCOM book is just an example of a larger issue. I’m writing this blog entry from a text editor (it’s now 9:51 am), because there’s no offline version of MovableType’s blogging system that I know of for pre-caching entries. Wikis offer wonderful capabilities (as wiki.mozilla.org and developer.mozilla.org demonstrate), but only while you’re online. Bugzilla can’t be searched for bugs while you’re offline, which makes sense, but neither can you write partial bug reports in any little applet for later submission (or as note-taking when looking for dupes — something even Bugzilla doesn’t support so well).

We live in a world that’s so interconnected, we can’t help but feel a little loss when we’re disconnected.

I’m serious. I do a LOT of writing. I do even more reading. As a developer, the ability to read and write content is like the air I breathe. I’ve no desire to suffocate.

Ultimately, I’m looking for two types of things here:

  1. Clear instructions on how I can grab a collection of written documentation at once — from wikis, Bugzilla, cvs, Google (yeah, you, Google, let me click a few checkboxes from your search results page and give me a downloadable zip from your cache), etc.
  2. Tools that will let me write content for wikis, Bugzilla, blogs, etc. while I’m offline, even in an incomplete state, for me to submit later. SeaMonkey- and XULRunner-compatible extensions preferred. (If one’s crashed, I can use the other.)

This wouldn’t match what I can do online entirely, but it would save me a bunch of trouble.

Oh, I’m done writing this article — it’s 10:05 am, and the bus is arriving at the light rail station. Gotta go!

(Links added afterward.)

XUL, XBL, JS and DOM

XPath Generator is coming

Thanks, everyone, for your comments on generating xpaths. I now have preliminary module owner’s approval from peterv to implement XPathGenerator in mozilla.org code. (I’ll go to him for review as a condition of moa.)

Almost two years ago, I wrote a whimsical article about how not to add code to the tree. (I believe that was for serverpost.) This time, I think I’m following the right path, including an open API, and keeping other developers (sicking, mixedpuppy, timeless) specifically informed.

This also, by the way, marks two significant milestones for me. First, it is the first time I’ll be writing a component for mozilla.org native code from scratch. I’ve filed patches before, many times. I’ve started spinoff projects a few times too. This time, it’s going straight in to the core. That’s a good feeling

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. Second, it’s the first time I’ll be attempting to write a XPCOM component in C++. As a JavaScript guy, that’s going to be a test, but I won’t fail it. I’ll just keep trying until I get it right.

UPDATE: I need test cases! Please send me some. I’ll pick the clearest and most comprehensive, and add them to the bug. (No, I’m not nearly ready to run the tests; I just need something to compare my results against.)

XUL, XBL, JS and DOM

Open-source development: sometimes too fast

3 Comments 

WeirdAl	what's this nsINode thingy?
ah, hell, you bitrotted me AGAIN
didn't you? :)
bz	mmm... maybe
depends
I did wait till after you landed your doRemoveChild stuff, right?
WeirdAl	yeah, you did, but I just reposted the mutation-events-for-standalone-docs patch a couple days after that patch landed
WeirdAl	chuckles, annoyed
WeirdAl	that's got to be the fifth time I've been bitrotted, at least
bz	WeirdAl: does this really break that?
WeirdAl: with a very few exceptions this should be very very compatible with all existing code
WeirdAl	bz: it probably broke the patch
(the newest version of the muts patch, that is)
I'll know when this fresh tree checkout finishes
bz	WeirdAl: URI?
WeirdAl: to patch?
WeirdAl	https://bugzilla.mozilla.org/attachment.cgi?id=208460
I'm not really upset -- patches that don't have r+sr, nobody owes anything to
probably affects smaug's "centralize event dispatch" patch as well (which didn't compile)
bz	ah
yeah
@@ -2759,23 +2766,25 @@ doInsertChildAt(nsIContent* aKid, PRUint
That hunk will have conflicts
WeirdAl	probably a few others too
damn, why you content guys gotta be so proactive? :-D
how's a little wannabe going to keep up?
bz	mmmm
good question. ;)

In actuality, it’s the third time a patch on bug 201236 has been bitrotted. But there have been a couple times where, while I was waiting on the doRemoveChild patch (for bug 312522), that the underlying code changed.

I guess the heart of my gripe (which isn’t too serious, just mildly annoying) is that patches can land without much consideration for other work happening in the same space and waiting for reviews

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Technobabble

From contractor to employee…

2 Comments

In late 2004, I went from being a wannabe software engineer to a real software engineer. I was a contractor working through a placement agency. For the last seven months, I’ve been working through the placement agency at ManyOne Networks, Inc.

Effective today, I am now working directly for ManyOne, as a software developer focused primarily on Mozilla. Not only does this mean a very nice salary bump, but it means that I’ve made my dreams come true

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. I’m doing what I love doing, and I’m getting paid to do it.

In case you’re wondering what my plans are to do with the additional money, they include:

  • Moving into my own apartment in Scotts Valley
  • Buying a Mac for Mozilla work
  • Starting college (yes, I’ve never been, and now I won’t owe anything when I get out)
  • Shoving some money into my Roth IRA
  • Finishing the donation to a church that I gave a verbal agreement to

The most significant part about being hired directly is that I’m no longer hourly. While this can mean very long hours on occasion, it also means that on other occasions, I can spend time working on mozilla.org code at the office freely. The goal is to make our corporate product better, of course, but if we can share the improvements with SeaMonkey (and later, Firefox), so much the better.

Happy Happy Joy Joy!

Alex Vincent’s ramblings about Mozilla technology, authoring, and whatever he feels like.