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Friends (100 unread)

Planet Matt

Bookmarks: Toddler Lock: The Android Baby Toy

Posted: November 17th, 2008, 9:19am MST

"Toddler Lock turns your precious Android Phone into a baby toy."

Josh

habes @ 2008-11-16T09:34:00

Posted: November 16th, 2008, 10:45am MST by Josh

I went to an anti-prop-8 rally and parade today, and it was so awesome. It was just full of love and positive energy. For a bunch of people who just got a royal "fuck you" from the state of California, it was a surprisingly upbeat event.

The weather was beautiful, and from what I hear was even more stunning in San Francisco, which also had a rally. God clearly voted today, but unfortunately s/he is not a citizen of the state of California.

I climbed many trees and other city habitat to get good photos (feeling a bit like Zaccheus in the process), temporarily putting myself in more danger of falling than I normally would. But it all turned out ok.

From Marriage Equality March

From Marriage Equality March

From Marriage Equality March

From Marriage Equality March

My favorite sign:

From Marriage Equality March

The only people I could find who weren't having a good time:

From Marriage Equality March

Planet Matt

Bookmarks: LEGOs, Play-Doh, and Programming

Posted: November 10th, 2008, 10:32am MST

"You can build with Play-Doh using LEGO construction techniques. Just build bricks out of Play-Doh. It’s unwiedly and impractical, but it can be done. The real question is: why would you want to?"
Bookmarks: Flickr Developer Blog » Lessons Learned while Building an iPhone Site

Posted: November 7th, 2008, 4:52pm MST

Good tips for any mobile web development.
Bookmarks: Flash/Flex versus the Open Web (AJAX)

Posted: November 5th, 2008, 9:44pm MST

"Through good construction of your data payloads, you can get even large [JSON] payload size close to that of a binary protocol such as AMF. And if you’re doing paging style access, well … smaller payloads are more size efficient in JSON than they are in the AMF binary format."
Journal: Obama

Posted: November 4th, 2008, 9:35pm MST

Eleanor heard the fireworks from her room this evening, so I let her out of her crib to see them out the window. I told her there was a new president.
Bookmarks: Daring Fireball: iPhone-Likeness

Posted: November 3rd, 2008, 4:58pm MST

"Like the Mac, the iPhone has established UI conventions that aren’t just different, but contrary to the conventions of what has preceded it. Apple has sketched out a remarkably clear picture of what it means for an app to be 'iPhone-like'."
Bookmarks: Mjt: an In-browser Web Framework

Posted: November 3rd, 2008, 2:14pm MST

"Mjt is a Javascript application framework that runs entirely in a web browser, based on a HTML templating engine."
Bookmarks: Seth Godin: Be careful of who you work for

Posted: November 1st, 2008, 9:52pm MDT

"Your boss and your job determine not only what you do all day, but what you learn and who you interact with."
Bookmarks: Writing Self-Confident Code

Posted: October 31st, 2008, 4:51pm MDT

"Pervasive null tests are a code smell."
Bookmarks: The Seattle Public Library: Upcoming Featured Events

Posted: October 27th, 2008, 10:03am MDT

"Join us from 12:05 p.m. to 12:50 p.m. every first and third Monday of the month for 'Thrilling Tales: The Story Time for Adults,' at the Central Library."

Josh

habes @ 2008-10-23T09:32:00

Posted: October 23rd, 2008, 10:37am MDT by Josh

Check out my pictures from Phil and Mary's wedding. They turned out awesome, thanks in no small part to this snazzy $1500 lens that I rented for $30. I never could have gotten those low-light portrait shots without it.

Planet Matt

Bookmarks: Ledger: Command-line accounting

Posted: October 21st, 2008, 9:11pm MDT

"Ledger is a powerful, double-entry accounting system that is accessed from the UNIX command-line."
Bookmarks: Housebuilding for Children: Step-By-Step Guides For Houses Children Can Build Themselves

Posted: October 19th, 2008, 4:20pm MDT

"A favorite of kids and parents since the 1970s, Housebuilding for Children offers step-by-step illustrated instructions for building six different houses with a description of the necessary tools and equipment."

John Carrino

Headed to Seattle

Posted: October 18th, 2008, 9:38pm MDT by John Carrino

Heads up to anyone who reads this; I’ll be in Seattle next Wednesday night, Oct 22. I’ll be around until Saturday morning. Doing some recruiting at UW on Thursday and Friday.

Planet Matt

Bookmarks: A CouchDB primer for an ActiveRecord mindset

Posted: October 10th, 2008, 11:49am MDT

"The essential problem here is to get rid of our relational mindset. That applies for designing databases as well as for designing tools and libraries for working with CouchDB."
Asides: Startup, or Google? Time to decide.

Posted: October 9th, 2008, 11:25pm MDT

Startup, or Google? Time to decide.
Bookmarks: Damien Katz: More CouchDB internals

Posted: October 9th, 2008, 10:35pm MDT

A newcomer to CouchDB explores the source code.

Josh

habes @ 2008-10-09T10:54:00

Posted: October 9th, 2008, 12:25pm MDT by Josh

Whoa this is getting ugly from the Republican side:
At rallies this week in Florida, crowds jeered and taunted members of the news media. One man hurled a racial epithet at a black television crewman, telling him, "Sit down, boy".

Yesterday, for the second time in three days, a speaker at a McCain rally in Pennsylvania referred to Obama's middle name, Hussein, in an effort to cast doubt in his religion and background. Obama is a Christian.

At the same rally, shouts of "terrorist" and "liar" could be heard following references to the Democratic candidate. On Saturday, McCain running mate Sarah Palin sought to link Obama to Ayers. "Kill him!" one man in the crowd shouted, not specifying who.

--The Guardian
Holy crap, it's the two minutes hate! It is sad and truly frightening that this is what the Republican party has come to. They have turned themselves into the party of xenophobia and hate.

They are spreading insinuation about Obama's link to a 1960s "domestic terrorist" without recognizing that they are breeding a new brand of extremism themselves! If guys at their rallies are shouting "terrorist," "liar," and "kill him," how far are they from actually doing something violent? The McCain campaign is taking a scorched earth strategy here, which is dishonorable and wrong.

One lesson I take from this is that no matter how decent a guy is when he's nominated to the Republican ticket, he'll never survive the experience with his decency intact. Because winning on the Republican side requires "mobilizing the base," and the base demands red meat. The base thrives on culture wars. The base has this need to find an "other" and demonize them.

It's a dark moment on the Republican side of the aisle.

Comments for Josh the Outspoken

Comment on Gazelle is (at least briefly) the most powerful top-down parser generator there is by Sylvain

Posted: October 7th, 2008, 10:32am MDT by Sylvain

It is unsolvable whether or not a context-free grammar is LL(k) for some k>=0: see Rosenkrantz and Stearns, Properties of deterministic top-down grammars, Information and Control 17:226–256, 1970 [www.dx.doi.org](70)90446-8

Josh

habes @ 2008-10-05T12:56:00

Posted: October 5th, 2008, 2:10pm MDT by Josh

Dear Sarah Palin,

You want to talk about questionable associations? How about addressing a political party whose founder openly hates America, and who died buying plastic explosives on the black market?
video candy

Posted: October 3rd, 2008, 1:07am MDT by Josh

Stop winking at me Sarah!!

Yep, you really said all those things:

Why does Senator Obama believe that McCain and Bush agree on almost everything?

Finally, FOXNews attacks Obama with the same attacks they used on Kerry:

Comments for Josh the Outspoken

Comment on A syntactic dilemma (and an intro to Gazelle’s ambiguity resolution) by Andrew

Posted: October 2nd, 2008, 10:35pm MDT by Andrew

I’d like to second the // option. Given that an empty regex is not at all useful (at least, I can’t think of any use for one), the syntax can remain unambiguous. Looking at the rules:

s -> a // b;
s -> a / / b;

and

s -> a /x / b;
s -> a / x / b;

it would be a good idea disallow whitespace in the // operator, just to make things even more clear.

Planet Matt

Bookmarks: Google 2001

Posted: October 1st, 2008, 1:00pm MDT

"In honor of our 10th birthday, we've brought back our oldest available index. Take a look back at Google in January 2001."

Josh

habes @ 2008-10-01T10:26:00

Posted: October 1st, 2008, 11:36am MDT by Josh

Check out this really interesting video from the New York Times about the debating styles of Sarah Palin and Joe Biden. It shows some highlights of their previous debates (Palin for Governor of Alaska, Biden in the primaries).

One thing to take away from this is that despite her embarrassing performance over the last week or so, Sarah Palin has in the past been a formidable opponent who has a maddening way of being being cutting and aggressive in a way that viewers love. The LA Times article Underestimate Palin at your own risk, former rivals say comes to the same conclusion. That article ends with:
"When you try to prove she doesn't know anything, you lose, because audiences are enraptured by her," Halcro said. "And her biting comments give you a sense of how competitive she is. Anybody who doesn't take her seriously does so at their peril."
So playing the expectations game that the campaigns love to play, I'd say that we should expect to see an aggressive and in-control Sarah Palin, judging by her previous performances.

Planet Matt

Journal: The case of the missing iPhone

Posted: September 29th, 2008, 5:26pm MDT

One more thing about the new house—
After we moved in, I was doing some work in the crawl space and dropped a nail. Fumbling for it in the dark, I felt something that didn't seem like one of the normal rocks or bricks used to weigh down the black plastic sheeting. I grabbed it and brought it out into the light. It was an 8GB iPhone.
The iPhone was dead, so I took it to work the next morning and borrowed a colleague's charger. When I powered it on and opened the mail program, I could see it belonged to the previous owner of the house. I contacted him at the phone numbers and email address I found in the iPhone. He was very surprised when he responded, wondering where on earth I had found his phone.
Based on some investigation the phone company had done after the phone was lost, he knew that the phone had last been accessed on the day he moved out—after it had turned up missing. With my account, he was able to piece together a possible scenario: One of the movers, or someone else with access to the house, had picked up the phone, checked that it worked, and pocketed it, hoping to steal it. But later the thief became afraid of detection, and ditched the phone in the dark corner where I eventually found it.
I returned the iPhone to its grateful owner. I admit I was a little disappointed that I didn't get to keep it.
Journal: End of days

Posted: September 29th, 2008, 3:16pm MDT

I'm sitting at home, unemployed, sick, taking care of a sick child, with no heat and no stove. And feeling pretty good.
My job at blist did not last very long. My peers were great, I feel I contributed a lot, and it was definitely a good change for me. But I was demotivated by the management style there, and the CEO/founder was never satisfied with my effort. So last week, as the company blew past its planned launch date with no shippable product and no achievable end in sight, I was let go. Our two contract engineers also left in the same week. I wish the best to the remaining five engineers. Personally I feel no regret - I knew it wasn't the right place for me, and was already planning on quitting soon.
If you know of a great job opening in Seattle (not including the Eastside, sorry), please see my resume and send me a note. I'm already talking to Google, and I'm on the fence about interviewing at Amazon again.
In other news, we're all moved in to our new house (photos here) and we're having a party this weekend. If you want to come and haven't gotten an invitation yet, just let me know!
I did finally come down with the cold that Sarah and Eleanor have had for over a week now. So my first few days of unemployment have been spent sleeping and reading Anathem. Our heater and other gas appliances are out while we wait for our new natural gas furnace to be approved by the city inspector. We haven't had a working dryer or dishwasher since we moved, or a working stove since our old electric one was hauled away weeks ago. Fortunately it's sunny and warm for once in Seattle, so we have the clothesline and grill set up in the back yard. Here's hoping everything's back to normal soon!

Josh

habes @ 2008-09-24T09:32:00

Posted: September 24th, 2008, 1:04pm MDT by Josh

Not quite two weeks ago I stepped on an airplane that would eventually (after two layovers) take me to Montpellier, France, a town on France's Mediterranean coast halfway between Spain and Italy. The occasion was the Renaissance Consort Workshop, a week-long course of singing Renaissance Polyphony one on a part. The course is hosted in a small town in the south of France called Roujan, which is not particularly close to anything, but is full of charm and is not at all catered to tourists. This part of France is solidly wine country, which is abundantly clear not only from the rows of grapes you see everywhere, but also the tractors that are frequently driving through the streets pulling carts full of harvested grapes behind them.

Though the picture doesn't show it, the building where this tractor is depositing its grapes is the same building where the finished wine is being sold. This single building quite literally takes grapes out of a tractor's cart on one end and sells them as bottles of wine on the other!

The house in Roujan where the course is hosted is called La Maison Verte, and it is owned by Anne and Fran who use it to host courses like the one I attended. La Maison Verte doesn't particularly stand out from the rest of Roujan when viewed from the street, but once you get inside you're transported into a sort of fairy tale.

So the course is essentially a chance to spend a week singing some of the world's most beautiful music in a fairy tale setting with world-class musicians as your tutors.

The tutors this year were Robert Hollingworth, Erik Van Nevel, and Francis Steele. Robert Hollingworth looked terribly serious to me in his publicity photo that I saw before I arrived, but within two seconds of meeting him I realized he was a quite charismatic and personable chap with a boyish charm that instantly puts people at ease. In every situation he had something amusing or insightful to say (and often both). I didn't get to work with him in sessions as much as the other tutors, but I did sing a Monteverdi madrigal in one of his sessions, which inspired me to give them another look -- they had never resonated with me before. Robert also led warm-ups, and really focused on getting rid of tension in our tongue and throat.

Erik Van Nevel was full of passion; I'll never forget his coaching on "Christe, adoramus te" by Monteverdi. It is a relatively short piece that on the page doesn't look particularly dramatic, but Erik's interpretation of the piece had an extreme amount of emotion: one moment humble, the next desperate, the next pained. I am quite confident that even in the end we gave him only a fraction of the emotion he was asking for. Erik also offered insight about how to make sure our interpretations were stylistically appropriate to the music. Erik pointed out times when we were doing things that were musical, but using "tools" that were Baroque rather than Renaissance.

And finally Francis Steele, who brings a deep reverence to the music and never-ceasing attention to the text. I have to admit that I've never given the text the care or attention it deserves in this music. I shame myself to say so, but in the past I've put forth the opinion that Latin serves primarily as a way to put a variety of vowels to polyphony. But Fran shows us all first-hand how much the music can improve when when you are sensitive to the text. He also demonstrated that resisting the urge to let the music "take off" volume-wise can make the music clearer and ultimately more enjoyable to sing.

We all arrived on Saturday afternoon, a beautiful sunny day as nearly every day was. Anne directed us to our rooms so we could deposit our luggage, and I spent a while just wandering around with my jaw on the floor. My room was quite dark when I walked in, giving me the opportunity to bring it to life by opening the doors onto my own private balcony that looked out over the town of Roujan.

We had our first singing session that night. We started with introductions, and I was somewhat surprised that the vast majority of the 17 attendees had attended the course before. I could already see that this was going to be a great experience, but it was still surprising that so many people were motivated enough to make the time and financial investment year after year. Nearly everyone was English, though some had been living in France for extended amounts of time. I was one of three Americans, and the only one currently living in America -- my trip from Seattle was by far the longest anyone had come for the course. However, to my surprise, the cooks (the exquisite, AMAZING cooks -- I'll get to that later) were originally from Seattle also.

In our first session Fran led us all in Diliges Dominum by Byrd, an eight part piece of tall chords that move in a slow but steady half-note (or "minim" as I would concede to the Brits) pulse. I almost immediately acted in an instinct to add intensity to the piece by really leaning into rising lines, but Fran stopped us and said "don't try to come out of the texture." He pointed us to the text for the piece, which is "Thou shalt love the Lord thy God from thy whole heart, and with thy whole soul, and with thy whole mind. Thou shalt love thy neighbour as thyself." He argued that it is a corporal, corporate text that demands total togetherness. I should mention that my recounting of Fran's remarks cannot do justice to the way that he delivers them. He speaks of the music and the texts to which they are set with such sensitivity and humility that it inspires us to sing with an entirely different attitude toward the music than we might have walked through the door with.

For me that opening session set a tone for the week: this was not going to be a week of powering through big pieces, it was going to be about sensitivity and awareness. These were lessons that were probably overdue for me as a musician: I've always been primarily motivated by melody, harmony, sonority, and musical brilliance, and haven't given text or meaning the attention it deserves. So this week was going to expand my horizons.

After that session we had our first supper, made by our resident cooks who were a couple originally from Seattle but now living in France. I have to say that I was totally unprepared for what an effect the food would have on me. I eat out a lot and I definitely enjoy food, but food has never been a motivating factor in my life. At La Maison Verte I found myself eagerly awaiting every course, reveling in every new flavor. The sorts of things that foodies always say suddenly started making sense. I ate things that on paper I never would have imagined liking, like tomato and peach soup. The food was exquisite.

The next several days followed a predictable format. There were three sessions of singing per day: two hours in the morning, one and a half hours in the early afternoon, and another hour and a half in the early evening. In each session we were divided into three groups among three rooms and three tutors. Everything was one on a part. Fran would lay out the schedule for these group sessions every morning, attempting to mix us up among all the singers, all the tutors, and all the rooms.

The rehearsal spaces were a sitting room (the room where we ate breakfast), a small art gallery, and La Maison Verte's main rehearsal room. I had gone with some worry that I would find the rehearsal spaces frustratingly dry in their acoustic. What I found is that though they were certainly not reverberant like a church is, I never found myself frustrated about them. They didn't force one to work disproportionately hard. And they made our opportunity to sing in the church at the end of the week a great reward.

Each evening at 6pm we would have a brief "sharing" of three or so of the nine pieces that had been sung that day. This was a chance to see what everyone else had been up to. I also much appreciated the repeated opportunities to "perform," since I have performance-related tension problems that manifest themselves even in the most informal sort of "performance." All in all I found that the course's itinerary worked very well. I even conceded once our day off came that it was good and necessary to let our voices rest for a day, even though I recoiled in horror when I first learned that we would have a whole day in the middle of the week without any scheduled singing!

There is one part of the course's format that doesn't make it onto the itinerary but is nevertheless an absolutely essential part of the experience. You see, the last thing on the itinerary every day is supper at 8pm. What is not captured are the hours of talking, drunken singing, and general silliness that extend well into the morning, for as long as anyone will stay up. And one thing you can be sure of is that Fran will be the last one to retire, and until the very end will share with you a mix of silly banter and profound moments that it's hard to describe unless you know the guy. One night when there were only four of us remaining he whipped out a set of part books written in old notation, and we attempted to read through them despite the strange notes and unfamiliar clefs that can change from line to line! The next morning Fran tacked an extra event on the day's schedule: "12am: Josh lectures on singing from sixteenth century part books (with full illustrations by Josh)," which was especially devious given that I was clearly the most clueless about anything having to do with part book singing. But naturally by 12am that night I was suitably drunk that I heartily delivered a pseudo-intellectual treatise on the subject.

Wednesday was our day off, and I was lucky enough to be able to tag along with a fellow participant who was taking a drive through the French countryside. She had an interest in Geology, and had marked on her map several places that had some geological significance. We stopped in several beautiful villages (again, none of which had any tourist bent whatsoever) and walked a ways up the Gorges d'Héric. On one of the more rural roads our way was blocked at one point by a cow and later by an entire herd of sheep that were being moved from one field to another. As I mentioned, I was initially disappointed that we had a day off, but in the end I was quite happy for the opportunity to see some of the surrounding area.

The week culminated in a concert on Friday night at the town church, which was only a short walk from La Maison Verte. Despite the fact that we had been sharing every day, the concert was a great opportunity to have a bit more formal and prepared presentation of our music, and to sing for other people. The acoustic also felt very rewarding after the week of singing in smaller spaces.

My week at La Maison Verte was fantastic, and I hope I get a chance to go back. The people were lovely, the tutors fabulous, the food exquisite, and the music deeply satisfying.

Planet Matt

Photos: Roxbury house exterior

Posted: September 20th, 2008, 4:32pm MDT
Photos: Roxbury house library

Posted: September 20th, 2008, 4:32pm MDT
Photos: Roxbury house dining room

Posted: September 20th, 2008, 4:32pm MDT
Photos: Roxbury house stairway

Posted: September 20th, 2008, 4:32pm MDT
Photos: Roxbury house kitchen window and back yard

Posted: September 20th, 2008, 4:32pm MDT

Comments for Josh the Outspoken

Comment on SVG support in Firefox 3 by Niels Grundtvig Nielsen

Posted: September 18th, 2008, 10:59am MDT by Niels Grundtvig Nielsen

Hm. I’m writing a music catalogue page, with the first line of each score as embedded svg. Works like a charm in Firefox 3.0 on a W*ws box, but strange results on ubuntu: only text elements scale correctly with browser controls

Any hints or tips for resolving this? gratefully received!

Planet Matt

Asides: Eleanor calls me on the phone at work and says, "Go home!"

Posted: September 17th, 2008, 3:45pm MDT

Eleanor calls me on the phone at work and says, "Go home!"
Bookmarks: Has the Large Hadron Collider destroyed the earth yet?

Posted: September 10th, 2008, 3:31pm MDT

NO
Bookmarks: Amazon to sell laptops from foundation - The Boston Globe

Posted: September 5th, 2008, 11:42am MDT

Low-cost laptops from the One Laptop Per Child Foundation of Cambridge will go on sale at Amazon.com this holiday season, making the $200 computers available for the first time through a retail store.
Bookmarks: Kenyon Hall-Vaudeville, Theater and Music

Posted: September 4th, 2008, 10:07am MDT

Home of the Mighty WurliTzer! "Seattle Artists/Kenyon Hall, a 501(C)(3) non-profit organization, presents live musical and theatrical performance traditions and early childhood musical education in an historic West Seattle setting."

Josh

habes @ 2008-09-02T02:37:00

Posted: September 2nd, 2008, 4:25am MDT by Josh

Any fans of The Usual Suspects? I love this movie, but I'm always confounded by trying to piece together the plot given the ending.

Ok, so Verbal Kint is Keyzer Soze. But there are stil so many questions I have about what really happened.

1. Why did Keyzer/Verbal even get caught after the ship blew? He's such a bad-ass that he killed everyone on the ship and then blew it up, but he couldn't figure out a way to escape before the authorities arrived? Seems implausible.

2. So Arturro Marquez ("The one guy who can identify Keyzer Soze") was the target of the whole operation on the ship. The story is that he was a smuggler who knew all about Keyzer Soze. He was arrested for drug trafficking in New York, but escaped to California where he was captured again. In California they were setting up extradition. He didn't want to go to jail so he named 50 names (including Keyzer Soze), but then escaped and fell into the hands of his own people, who decided to sell him into the hands of some Hungarians who wanted to stick it to Keyzer Soze.

But his story doesn't really make sense. If he was going to be extradited (presumably to Argentina) then why is he doing a deal with the American authorities? Doesn't seem like that deal would do him much good once the extradition went through.

3. Who killed Edie and why? Kujan thinks it was Keaton, but Keaton pretty clearly died on the boat. Verbal/Keyzer doesn't seem to have any reason to do away with her -- everything she knows about Arturro would be public record.

4. How did the Hungarian who survived with burns know that the person he saw was Keyzer Soze?

5. Who brought Edie onto the extradition case? It must have been someone related to Keyzer Soze (even if "Kobayashi" was not his real name) -- it couldn't have just been a coincidence. Whoever it was, can't Kujan use that connection to go straight to Soze?

I'm sure the real reason is "relax, it's a movie." But I want everything to make sense in the end!

Comments for Josh the Outspoken

Comment on SVG support in Firefox 3 by Edd

Posted: August 27th, 2008, 6:13am MDT by Edd

Here’s a demo of some the cool things you could do :http://clockamatics.googlepages.com/live.html

Those clocks were written for Linux desktop in svg, all they needed to work in Firefox was javascript.

Planet Matt

Bookmarks: West Seattle Blog… » Another playground proposal: Arbor Heights site

Posted: August 25th, 2008, 10:29pm MDT

"For families in Arbor Heights, AH Elementary is the major playground option, but the folks at Arbor Heights Community Church are hoping to change that, with a proposal for this undeveloped lot"

John Carrino

Last Day in China

Posted: August 25th, 2008, 10:17am MDT by John Carrino

I fly out tomorrow and it was a great trip but I am ready to be back in the good ol’ USofA. We kept pretty busy for most of the trip except for the last day or so; which was a good for winding down.

It was pretty hot and humid every day I was here so it will be nice to be back in Cali where there is no humidity and nights are cool and refreshing. If you have had the luxury of living or camping in Illinois without AC, you know why night in Cali are awesome.

The play-by-play of the trip is below the fold.

I attended five Olympic events. Basketball, Volleyball, Wrestling, Table Tennis, and Baseball.

We started the trip in Shanghai and planned to spend more time there, but had to get to Beijing to see Yisong’s mom and sister before they flew home. We spent a few days in Beijing and then we flew to Huangshan to do a 3 day trip there hiking the mountains.

After touring Huangshan with Yisong’s cousins we took a night train and another train to their hometown, which is Yisong’s Dad’s hometown. We visited with them and had several good meals and did some shopping and took a night train back to Beijing.

As soon as we got back to Beijing at 8am on the night train, we headed to the Great Wall to do some sightseeing. That night we went to see women’s volleyball and it was an awesome quarter-final match with USA playing Italia.

I woke up the next day early went to the Wrestling venue and tried to see some freestyle wrestling. I figured that I really should watch some wrestling if I came all this way to see the olympics. It turned out that I accidentally went to see the weight classes that I am interested in, 66kg and 74kg (They have a 55kg and a 60kg, which would have also been cool). Even better, it was the 1/8 1/4 and semi-finals. So I basically got to watch the whole bracket for 2 weight classes in 3 hours. Some of these guys wrestled 3 times in under 3 hours, which is pretty tough.

After that success, we went to the 798 art district, which was pretty awesome. If you know me, you know that I’m not that into art, but I could have hung out there all day. There are like 400 galleries with all kinds of crazy art. We then went to see Ari’s friends’ Terra Cotta warrior marionette show, but they changed the times around, so we were late to the last show and they didn’t let us in. We then came back the next day, and it was rained out, so sad times on boats with respect to the show Ari suggested we see.

But all was well because that night we hit up the Peking duck and then did some serious clubbing. Yisong did not join us because he had a talk to give at Microsoft Research Asia in the morning. I however rolled in from partying at like 3:30am and had to wake up at like 7:30 to get ready to go to MSRA. After the talk we went out to a really nice lunch with the Microsoft people and then Yisong had meetings all day. I didn’t want to hang out in his research meetings for the rest of the day, so I met up with Lisa and we tried to go to the Terra Cotta thing (which was rained out), and after that didn’t pan out, we went to the Beijing Zoo and saw some Pandas.

I caught up on sleep that night and we went to see Table Tennis the next afternoon. We decided that partying was in order this Friday night so we started at karaoke and at about 1:30 moved to the clubs. We didn’t get home until like 4:30 and Yisong’s grandparents were just getting up. I thought we were busted for sure because it seemed like they had been waiting for us all night, but they had just gotten up and Yisong smoothed it over like a champ.

We got like 3 hours of sleep and were up for the 10:30am USA bronze metal baseball game. Baseball will not be an Olympic sport next year, so it is pretty awesome that we saw the last USA game of this era. It was a slug-fest with homers and was high scoring and back and forth and was a great game against Japan. We took the bronze and much sun (and beer) was had by all.

That pretty much wraps things up. We walked around the main Olympic area Saturday night; caught up on sleep. Sunday we watched Basketball and the closing ceremony on TV. Monday we went out shopping and hit up the local bars at night. And right now it is Monday night and Yisong and I are working through the last of the 24 pack of beer we bought 2 weeks ago and are being nerds writing our blog posts. yay!

It was a most excellent trip but I miss my life back home and am ready to be back! Now I just have that pesky 16 hours of travel tomorrow.

Comments for Josh the Outspoken

Comment on A syntactic dilemma (and an intro to Gazelle’s ambiguity resolution) by Dennis

Posted: August 23rd, 2008, 12:54pm MDT by Dennis

This might be a lame idea, but could you use // for the prioritized choice? I can not think of a reason why you would want to use // when defining a regular expression. Everybody knows that two is better then one.

Also, | is OR sometimes and || is OR other times, so why not / sometimes and // other times….

Planet Matt

Bookmarks: Google Spreadsheets APIs and Tools - Google Code

Posted: August 19th, 2008, 10:11pm MDT

blist should implement this API.
Bookmarks: EveryBlock Seattle: Seattle local news and public records

Posted: August 18th, 2008, 10:14pm MDT

Now in Seattle! "Enter any Seattle address for fresh updates of nearby restaurant inspections, fire department dispatches, media coverage and more."
Bookmarks: Crosscut Seattle - Gentrifying White Center

Posted: August 18th, 2008, 10:13pm MDT

Good overview of changes just south of Seattle.

Comments for Josh the Outspoken

Comment on A syntactic dilemma (and an intro to Gazelle’s ambiguity resolution) by Anonymouse

Posted: August 18th, 2008, 11:11am MDT by Anonymouse

re. prioritised choice: How about |>

Josh

habes @ 2008-08-15T16:17:00

Posted: August 15th, 2008, 5:18pm MDT by Josh

To add to the thoughts about the Georgia/Russia thing, here's a video on YouTube where FoxNews interviews South Ossetians who take over the time slot by condemning Georgia and thanking the Russians.

12-year-old girl: "but before I say anything else I just want to say that I was running from Georgian troops bombing our city, not Russian troops. I want to say "thank you" to the Russian troops that were helping us out."

Not saying this thing is simple or one-sided, but there definitely is another side to this.

Sarah, did you get in touch with your Georgian friend?

John Carrino

First Olympic Event

Posted: August 14th, 2008, 10:02pm MDT by John Carrino

Wednesday we got into Beijing and went shopping for some cheap stuff. We followed that up with a big family dinner. Later that night we hit up the bar scene and partied late.

On Thursday, we woke up and went to the Forbidden city. Check out pictures here. Yisong and I followed that up with some awesome basketball games. I will send those pictures later, because there are over 400 of them to sort through. China won it’s match with Angola, which was fun to watch. The game of Russia against Lithuania was really close the whole way and was very exciting.

Planet Matt

Bookmarks: List of combinatorial computational geometry topics - Wikipedia, the free encyclopedia

Posted: August 14th, 2008, 12:19am MDT

Bookmarks: List of combinatorial computational geometry topics - Wikipedia, the free encyclopedia

Josh

habes @ 2008-08-13T13:02:00

Posted: August 13th, 2008, 2:24pm MDT by Josh

What the heck is going on with our American response to this Russia/Georgia thing? Now maybe I'm just getting bad/biased information from the Wikipedia article on the South Ossetia war, but to me the situation is:

* South Ossetia is a part of Georgia that is ethnically different from the rest of Georgia.
* South Ossetia has been de facto independent from Georgia since the early 90s (though not internationally recognized)
* South Ossetia overwhelmingly favors independence from Georgia, as evidenced by a 2006 referendum in which 99% of registered voters voted for independence with voter turnout at 95.2%.
* after escalating tensions and small-scale fighting, Georgia launches a full-scale attack against the South Ossetia capital in the middle of the night.
* Russia retaliates by pushing back the Georgian invasion and attacking Georgia.

This is a complicated situation, but all we as Americans are offering in our media and from our leadership is a simplistic "evil Russia invades democratic Georgia" story. Our leaders and our presidential candidates give tough talk against Russia, without acknowledging the fact that Russia was retaliating against a Georgian invasion and attack against a city.

At first I thought I was just crazy and missing something major, but apparently apparently I'm not the only one who feels this way.

Geez, the last thing we need is to introduce more tension in our relationship with Russia. How would we react if Cuba or Venezuela invaded the Bahamas? You'd better believe that we'd not only drive them out, we'd launch strikes against military targets in their home countries. And how cynical would we be at that point if Russia spun it as "US aggression"?

John Carrino

China Day 1

Posted: August 12th, 2008, 8:12pm MDT by John Carrino

Shanghai is an awesome city. It’s too bad we didn’t get much time to enjoy it or the nightlife. I got in around 9pm and after a bus ride and cab ride, we were at the hotel just after 10. We had some food and got some sleep.

I had tried to fight the jet lag, but I was up at 6am the next morning and went around looking for a coffee shop, but nothing was open yet. We took a cab down to the Bund but the river trips didn’t start till 10am. We got some breakfast and hung out in the restaurant for a while because they had air conditioning and it was hot and really humid out. After the boat trip we hung out at the Jade Garden area and bought some souvenirs and a lot of food. We caught the night train to Beijing at 7pm and that was a 12 hour ride that got us into Beijing at 7:15am.

We took the subway then a taxi to Yisong’s grandparents’ house. We had breakfast, showered up and found an open wireless connection. Now we are about to head out and buy more cheap stuff and hang out in Beijing.

Check out the pictures of Shanghai here

Comments for Josh the Outspoken

Comment on SVG support in Firefox 3 by Jeff Schiller

Posted: August 11th, 2008, 12:27pm MDT by Jeff Schiller

FYI - Opera 9 and Safari 3 have similiar level of support for SVG. Firefox 3.1 should have some level of support for declarative animations (SMIL) as should the next version of Safari (after 3.1). Opera has had SMIL and SVG support for years.

The only browser really not playing the SVG game at the moment is Internet Explorer.
Comment on SVG support in Firefox 3 by Matt Brubeck

Posted: August 11th, 2008, 12:03pm MDT by Matt Brubeck

P.S. I was worried that DojoX GFX would have dependencies on a lot of the other (huge) Dojo libraries, but it looks like the dependencies are very minimal. So, that’s another point in Dojo’s favor.
Comment on SVG support in Firefox 3 by Matt Brubeck

Posted: August 11th, 2008, 12:00pm MDT by Matt Brubeck

I haven’t tried out dojox.gfx yet - still working down my list of libraries to try. It looks pretty usable and mature. (Raphael on the other hand was first released last week, so it’s hard to say yet.)

My use case is pretty simple (just some black-and-white line drawing), so it probably won’t make that much difference which library I use. At that level, they all have the same features. If I chose Raphael it would probably be because it would be less intimidating to customize or debug the library myself. On the other hand with a more mature library I might not need to.
Comment on SVG support in Firefox 3 by josh

Posted: August 11th, 2008, 11:32am MDT by josh

@Matt: how is Raphaël different than DojoX GFX? Just that it’s more minimalistic?

2 Star

A syntactic dilemma (and an intro to Gazelle’s ambiguity resolution)

Posted: August 11th, 2008, 1:55am MDT by josh
As I’m adding more capabilities to the Gazelle grammar description language, I’ve come up against a problem for which I can’t find any solution I like. So I’m putting it to you, my esteemed readers, to suggest a solution I will like more than the ones I’ve already brainstormed.

Here’s the problem. I’m at a point where I want to support prioritized choice in Gazelle grammars. Prioritized choice is a way of letting grammar writers explicitly resolve ambiguities that have crept into their grammar. Take the following grammar rule:

s -> "X" | "Y";

The two alternatives in this rule (X and Y) have equal priority. That doesn’t actually matter in this case, since no text can match them both, but now consider changing the rule a bit:

s -> "X" | "X";

Now there is a problem, because an X matches both alternatives. There are two legal parse trees that are both correct according to the grammar. As a result this grammar is ambiguous. A parser doesn’t have any reason to choose one over the other, because they are of equal priority.

The solution to the problem is to let the user specify which alternative should be taken when both match. If we allow users to do this by introducing prioritized choice, our solution looks very much like how Parsing Expression Grammars (also known as PEG’s) work. And the syntax that has become very standard in the PEG literature is to use “/” as the operator for prioritized choice. So our ambiguous grammar would be made unambiguous by using prioritized choice:

s -> "X" / "X";

Now the parser will always choose the first alternative, and the grammar is no longer ambiguous. You might wonder “what’s the point?”, since the second alternative will never be taken, but in many other cases of ambiguity, the choice of lesser priority will be taken. The classic example of ambiguity (which can be resolved in this way) is if-then-else:

stmt -> "if" expr "then" stmt | "if" expr "then" stmt "else" stmt | expr; expr -> "true" | "false" | /[0-9]+/;

This grammar is ambiguous, because the fragment:

if true then if true then 1 else 2

…can be parsed in two different ways. The “else” could be assigned to either “if” — both are valid according to the grammar.

So I definitely know I will be introducing prioritized choice. The question is what syntax to use. Like I mentioned before, I would really really like to use “/” since there is a strong convention from the PEG world for it. But unfortunately this introduces a major ambiguity in Gazelle’s own grammar, because it conflicts with the syntax for regex literals. What does this mean?

s -> a / b; a -> c / d;

Is that two rules that both use prioritized choice, or is it one rule that has a giant regular expression in it?

s -> a / b; a -> c / d;

I really don’t want to give up using slashes to introduce regular expression literals, because that is a really strong convention that a lot of programmers are familiar with. But I also really don’t want to give up using the really strongly established convention of using slash for prioritized choice.

Anyone have an idea for a compromise I might like? The only one I can think of is adding a prefix to the regex literals sort of like Perl’s m{} form for regular expressions. It could be something like m/regex/. But I hate to add that uglification to the grammar, especially since regular expressions are going to be SO much more common than prioritized choice.

Any ideas, anyone?
Bonus: the other form of ambiguity resolution
Choice/alternation isn’t the only possible source of grammar ambiguity. Gazelle’s constructs for optional and/or repeating grammar fragments can also be ambiguous. The if-the-else example is perhaps more idiomatically written in Gazelle like so:

s -> "if" expr "then" stmt ("else" stmt)? | expr;

It’s written differently, but it’s just as ambiguous as before. So we need the same sort of tool to resolve this ambiguity — a way to say “prefer to match the optional part” or “prefer to NOT match the optional part.” This is equivalent to defining a “greedyness” to these operators like Perl lets you do in regexes. The syntax I am planning for these is:

s -> a b?; // no preference to match the b or not s -> a b+; // no preference to keep matching b or not s -> a b*; // no preference to keep matching b or not

non-greedy variants
s -> a b?-; // prefer to NOT match b (non-greedy) s -> a b+-; // prefer to STOP matching b (non-greedy) s -> a b*-; // prefer to STOP matching b (non-greedy)

greedy variants
s -> a b?+; // prefer to KEEP matching b (greedy) s -> a b++; // prefer to KEEP matching b (greedy) s -> a b*+; // prefer to KEEP matching b (greedy)

I’m not following the Perl convention here (Perl uses “?” instead of “-” to make the match non-greedy). But on the other hand:
1. Perl doesn’t have a way to explicitly make the match greedy — matches are greedy by default. So it has no convention for a “make greedier” operator.
2. not very many people know/use Perl’s greediness operator anyway
So to write the if-then-else example with explicit ambiguity resolution, you would write:

"if" expr "then" stmt ("else" stmt)?+ | expr;

…because when there is an ambiguity, we want to bind the else to the most recent if.
An aside: “great, so I can just start slapping greedy and non-greedy modifiers on everything, just to be safe, right?”
Not so fast there. Ambiguity resolution isn’t something you should take lightly, because a grammar with an ambiguity in it presents a user-facing irregularity in your language. For example, the if-then-else example is a user-facing issue: either “else” pairing makes logical sense, and it’s totally arbitrary how you decide to resolve the ambiguity. You have to tell your users about it. You should strive to absolutely minimize the numbers of such ambiguities in your language whenever you can!

The danger of using ambiguity resolution operators willy-nilly is that you don’t necessarily know if they’re actually resolving ambiguities. For example, if you wrote:

s -> "X" / "Y";

…the prioritized choice here is completely extraneous, since this grammar is unambiguous already. Because ambiguities are so important to keep track of and educate your users about, you don’t want to have to wonder whether a prioritized choice is resolving an ambiguity or not. You want to know that it is.

To this end, Gazelle will keep track of all ambiguity-resolution operators and error if any of them are never actually used to resolve an ambiguity. So you can’t just sprinkle them around “just to be safe,” you must only use them where they are effective. And this will make Gazelle grammars much more useful, because you will know exactly where all your ambiguities are.

By the way, Gazelle can’t detect any ambiguity in your grammar; calculating whether an arbitrary context-free grammar is ambiguous or not is undecidable. Basically, all grammars fall into one of several categories:
1. Gazelle can handle the grammar (ie. the grammar is in the green region of the diagram in my previous entry).
2. Gazelle can handle the grammar except for the fact that it’s ambiguous.
3. Gazelle cannot handle the grammar, and would still not be able to even if you resolved the ambiguities.
If your grammar falls into category 3, Gazelle doesn’t know whether the grammar is ambiguous or not. But for grammars in categories 1 or 2, Gazelle knows exactly where the ambiguities are.
Bonus #2: a word about Parsing Expression Grammars
Something you might say (especially if you’re a PEG fan) is “gosh Josh, if you’re going to all this work to introduce ambiguity resolution, why not just use PEG’s flat-out and abandon all this LL(*) nonsense?” Because essentially what I’m doing is supporting both PEG-based constructs (like ordered choice) and context-free grammar constructs like non-ordered choice. And PEG’s support a larger set of grammars than Gazelle ever will (I believe they support any non-left-recursive PEG, though I don’t have a reference for this).

There are two really major reasons why I don’t think PEG’s are the way to go. The first one is related to the point I was making before. With PEG’s all choice is prioritized choice. However, with PEG-based tools you have no idea if there are real ambiguities in your grammar or not. PEG’s are defined such that ambiguity does not exist, but this does not make if-then-else style issues go away, it just sweeps them under the rug. Even if you don’t call it “ambiguity,” it is still a user-facing issue that you as a language designer definitely want to know about! If you have the following in a PEG:

s -> a / b;

…you have no way of knowing if this represents an ambiguity, which means that you don’t know if changing the grammar to:

s -> b / a;

…will make a substantive difference or not! You’re flying blind.

The second reason is that Gazelle’s parsing algorithm will be far, far faster than packrat parsing (which is the algorithm used to parse PEG’s). Both algorithms will have linear asymptotic complexity (though as I briefly mentioned before, I believe that LL(*) grammars can degrade to n^2 in degenerate cases; though I will argue that this will never happen in any sane language). But though both are linear, packrat parsing’s constant factor is far higher, and packrat parsing uses O(n) space where n is the size of input.

This might all sound like hot air, but check out these real, hard numbers. On the homepage of the Aurochs parser generator, which uses PEG’s and packrat parsing to parse JavaScript, they say:

How much memory does it use?

An awful lot.

Grammar Input size Memory consumption CPU time Memory overhead

Javascript 140kb 380Mb 1s 2700

Javascript 71kb 180Mb 0.45s 2500

Javascript 1717 5.6Mb 0.01s 3200

I can’t vouch for whether this is a great implementation of packrat parsing, but the authors sure seem to know what they’re doing. I hope you’ll agree that 380Mb of memory just to parse 140kb of text is horrendous, and 1s is quite slow too. Gazelle can’t parse JavaScript yet, but here is a rough ballpark estimate of what the performance will be like to parse 140kb of text once it can:
- memory: Gazelle uses 24 bytes per entry on its stack, plus 12 bytes for every token of lookahead. These are the only non-fixed costs. If we assume a parse tree that goes 100 deep, and an input that requires 100 tokens of lookahead (both ridiculously large assumptions), Gazelle’s memory footprint is 3.6kb. This is 0.0009% of the packrat parser’s memory requirement.
- CPU: Gazelle currently parses JSON at 18.8Mb/s. JavaScript will be more complicated than JSON to parse, but Gazelle will also undergo a lot of optimization that hasn’t been done yet, so I’ll go with the 18.8Mb/s figure. That’s 134x faster than the 140kb/s Aurochs is quoting.
Like I said, the Aurochs authors seem to be very smart — I’m not saying they’ve done a bad job. I’m just saying that if Aurochs is any indication of what we can expect from packrat parsing, it is orders of magnitude slower, and takes enormous amounts of memory even for modest amounts of input text. If anyone has better numbers to show for packrat parsing, I’m all ears.

So even though it’s more work, I’m 110% convinced that using this combination of LL(*) with explicit ambiguity resolution is the way to go, and is the best way to achieve the goals that I have set out for this project.

Grammar	Input size	Memory consumption	CPU time	Memory overhead
Javascript	140kb	380Mb	1s	2700
Javascript	71kb	180Mb	0.45s	2500
Javascript	1717	5.6Mb	0.01s	3200

Planet Matt

Journal: Baby's first camp out

Posted: August 10th, 2008, 7:46am MDT

Every year my family goes camping at Penrose Point with a group of other families that we've known since I was in daycare with them. We reserve the group camp site for two nights, drive in with our tents and coolers and Coleman stoves, and spend most of our time relaxing at the beach or around the campfire. On the second evening we have a party—usually with a theme and costumes. This has been going on for something like 26 years now. Sarah and I skipped last year's trip because we weren't ready to take the baby with us, so this year was our first time camping with Eleanor.
Eleanor was thrilled beyond words with the entire trip. She'd love to spend every hour of every day playing outside, but we normally have to bring her back inside after a couple hours for pesky things like food or sleeping. So camping was like paradise for her. She spent hours playing in the dirt and wading in the lagoon, and thought that eating and sleeping outside were highly amusing. It also helped that we had grandparents and other friends around to keep her entertained when Sarah and I got tired.
Oh, and our Dr Horrible costumes were a hit at the "Musicals" theme party.
Asides: In Seattle, July showers bring August showers.

Posted: August 10th, 2008, 7:16am MDT

In Seattle, July showers bring August showers.

Comments for Josh the Outspoken

Comment on SVG support in Firefox 3 by Matt Brubeck

Posted: August 9th, 2008, 10:34pm MDT by Matt Brubeck

I just found Raphaël, which is just the SVG-based, jQuery-like JavaScript library I’ve been searching for! Vector graphics, here I come…

Planet Matt

Bookmarks: Review Board

Posted: August 9th, 2008, 10:16pm MDT

"Review Board is a powerful web-based code review tool that offers developers an easy way to handle code reviews."
Bookmarks: Raphaël—JavaScript Library

Posted: August 9th, 2008, 3:08pm MDT

"Raphaël is a small JavaScript library that should simplify your work with vector graphics on the web."

2 Star

Clarification and apology

Posted: August 7th, 2008, 3:53am MDT by josh

Terence Parr (author of ANTLR) pointed out a mistake I made when I was describing how ANTLR deals with non-LL(*) grammars. I said that ANTLR’s option for dealing with non-LL(*) grammars is to do a depth-first search which runs in exponential time. While I believe this is true if you enable “backtrack=true” alone, ANTLR also has a “memoize=true” option that you can use together with backtrack=true to reduce the time complexity to linear, at the expense of more space.

I also claimed that ANTLR can handle all grammars when backtrack=true is on. Terence corrected me and said that even with backtrack=true, ANTLR does not handle all grammars — for example left-recursive ones. I mistakenly thought that depth-first search parsing would be capable of handling left-recursion, but after some more thought and some time with my trusty Grune and Jacobs I understood why this is not the case. There are other top-down algorithms that can handle this, but backtracking depth-first search (with or without memoization) is not one of them.

Apologies to Terence for my misstatements about ANTLR!
The grammars Gazelle can handle

Posted: August 6th, 2008, 1:57pm MDT by josh

I wanted to follow-up a bit more on my recent posts about the grammars Gazelle and competing parsing frameworks can handle. Here is an Euler diagram showing my current understanding of what grammars Gazelle can handle compared with the well-known Strong-LL language classes as well as competing parsing frameworks.

Gazelle can currently generate lookahead for any LL(k) grammar, all LL(*) grammars that ANTLR can handle, and a few LL(*) grammars (namely tail-recursive ones) that ANTLR cannot. ANTLR can handle all LL(k) grammars and many LL(*) ones. SLK can handle

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