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Arbitrary Scripting Languages in XPages
Jesse Gallagher    

I think I've settled on JSR 223, the generic "Scripting in Java" specification, as the likely best way to embed Ruby. It seems like the "correct" way to do it and generally the cleanest. I don't like the notion that the way to customize the runtime is by setting system properties, so I'm still a little wary, but it'll do for now, in any event.

The side benefit of JSR 223 (and this would be true of BSF as well) is that it supports a crapload of languages, and it does so in a very unified and generic way. Accordingly, I modified my ViewHandler and created a GenericBindingFactory to browse through the list of non-Ruby available languages and create EL bindings for each.

The upshot is that, when this code is active, any JSR-223-compliant language in your server's classpath will become available for "#{whatever: ... }" bindings just by virtue of its presence. Note, though, that that doesn't necessarily mean it will be a good experience. For one, the page's variables (like param, facesContext, view, and so forth) aren't just available - you'd have to make something like the method_missing method I wrote for Ruby to automatically resolve them via FacesContext.getCurrentInstance(). Furthermore, some languages are problematic: for some reason, Jython throws NullPointerException errors for even the most basic formulas on almost every page load, while PHP still requires <?php ?> tags and spits anything else out to the server console.

I know what question is on the tip of your tongue, though, so I won't keep you waiting: yes, you can use your home-grown string-concatenation operators in Scheme! You can breathe a sigh of relief now:

<xp:text><xp:this.value><![CDATA[#{scheme: (set! + (let ((original+ +)) (lambda args (if (and (not (null? args)) (string? (car args))) (apply string-append args) (apply original+ args))))) (+ "Hello " "from " "Scheme") }]]></xp:this.value></xp:text>

Yes, that works, and no, there's no reason to do it. If you really like Lisp, though, Scheme and Clojure can now be in your XPages toolbox.

Once I'm able to post to OpenNTF, I'll include this in my first Ruby-in-XPages release, though I may leave the applicable code commented out by default. Who knows what horrors this could unleash?



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http://frostillic.us/f.nsf/posts/F660516EC59A25FC852579E5007D5F9C
Apr 19, 2012
100 hits



Recent Blog Posts
86


Quick Tip: Use Dojo Content Panes for Speedier Initial Page Loads
Mon, Aug 18th 2014 5:13p   Jesse Gallagher
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Mon, Aug 18th 2014 1:13p   Jesse Gallagher
As I mentioned at the end of this morning's post about SSL and reverse proxies, I'm going to be giving a session on using a reverse proxy in front of Domino at this year's MWLUG next week. Specifically, it will be one of two sessions, both on Friday: OS101: Load Balancing, Failover, and More With nginx I'll be discussing the general reasons why you would use a reverse proxy - not just the aforementioned SSL benefit, but also load balancing, failover, multi-app integration, new feature [read] Keywords: domino xpages integration server
204


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Mon, Aug 18th 2014 7:12a   Jesse Gallagher
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139


Quicker Tip: Lowering XPage Build Overhead When Using Jars
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Be a Better Programmer, Part 4
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138


Quick Tip: facetName-less Callbacks in XPages
Wed, Aug 13th 2014 5:12p   Jesse Gallagher
When you're setting up a Custom Control, you likely know by now that you can set up callback areas to add content to a specified place inside your CC content when it's rendered. They typically look something like this: Content Above Content Below You then drop content in there like so in your XPage: That works fine. However, you can benefit greatly by learning that both properties of the callback are optional. Leaving off the id isn't particularly interesting, [read] Keywords: ibm xpages properties xml
152


How I Learned to Stop Worrying and Love C Structs
Mon, Aug 4th 2014 8:12p   Jesse Gallagher
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247


Delving Into NSF Raw Item Data
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146


Building an App with the frostillic.us Framework, Part 6
Wed, Jul 23rd 2014 12:12p   Jesse Gallagher
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The Industry's Vileness
Tue, Jul 22nd 2014 9:13p   Jesse Gallagher
Fair warning: this post isn't technical. It's also full of sweeping generalities. When I attended middle and high school, it was as part of the last group of geeks and nerds that should face systemic ostracization. Naturally, high school will still be terrible for most people, just because it's full of high schoolers, but the world at large has seen a near-complete triumph for geeks and nerds generally. And this has had some very positive side effects: because we had to deal with exclu [read] Keywords: community development




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