Typing Chinese like English

I’ve long wished that typing Chinese could be as intuitive as typing English. By that, I mean that you should be able to approach a Chinese keyboard for the first time in your life and type any character you know, regardless of what dialect you speak. You shouldn’t need prior study of an input method like 倉頡. You shouldn’t need to know Mandarin. You shouldn’t even need to know Chinese beyond a cursory study of the writing system. I wanted there to be a Chinese equivalent of hunt-and-peck typing. 看見打字.

For about 15 years now, I’ve attempted a solution to this problem. I’ve had a few periods where I’ve worked on it intensely, but it’s mostly been a background hobby. To be honest, if I had known how long it was going to take, I might never have started.

I’m making it available for use today. Is it perfect? No. But I think it’s good enough to show other people. Also, I’m kinda sick of working on it.

So introducing: http://wuhou.im

I named it after Empress Wu, the only female ruler of imperial China, and somewhat relevant to the issue of Chinese input for the fact that she invented her own new Chinese characters.

For a long time I was stuck on the fact that HTML didn’t provide a way to know exactly which physical key the user is pressing when typing on a website, but thanks to Firefox’s support of DOM Level 3 key events, that is now possible. (If you’re using a different browser, the website might not work properly if you have a non-QWERTY keyboard layout.)

My current employer doesn’t let me work on Open Source projects or personal projects without prior permission, so let me be clear that this is something I developed prior to my current employment. And if I made any minor tweaks recently, you have no proof of that.

I myself do not know Chinese well (my interest in Chinese is mostly as a historical language of Vietnam and a liturgical language of Buddhism), so if you want to leave any comments, I’m gonna need them in English (or French).

Edit: You gotta press SHIFT to see more radicals. I’m sorry that’s not obvious. I’ll try to make that more intuitive.


In case any of my colleagues haven’t heard, I no longer work at Mozilla. I apologize for not sending out a company-wide farewell email. I wasn’t expecting my email access to be cut off so promptly.

Hence, this is no longer my work blog, but I still hope to contribute to the Mozilla Project (I am working on some patches as we speak), and I will continue to blog here about tech-related topics (and especially Firefox-related topics) on the occasion that I have something to say.

Python-style ‘with’ in C++

One of the most important idioms in C++ is “Resource Acquisition Is Initialization” (RAII), where the constructor of a class acquires a resource (like locking a mutex, or opening a file) and the corresponding destructor releases the resource.

Such classes are almost always used as local variables. The lifetime of the variable lasts from its point of declaration to the end of its innermost containing block.

A classic example is something like:

extern int n;
extern Mutex m;

void f() {
    Lock l(&m); // This is an RAII class.

The problem is, code written with these classes can easily be misunderstood.

1) Sometimes the variable is used solely for the side-effects of its constructor and destructor. To a naive coder, this can look like an unused variable, and they might be tempted to remove it.

2) In order to control where the object is destroyed, the coder sometimes needs to add another pair of braces (curly brackets) to create a new block scope. Something like:

void f() {

        Lock l(&m);


The problem is, it’s not always obvious why that extra block scope is there. (For trivial code, like the above, it’s obvious. But in real code, ‘l’ might not be the only variable defined in the block.) To a naive coder, it might even look like an unnecessary scope, and they might be tempted to remove it.

The usual solutions to this situation are: (a) Write a comment, or (b) trust people to understand what you meant. Those are both bad options.

That’s why I’m fond of the following MACRO.

#define with(decl) \
for (bool __f = true; __f; ) \
for (decl; __f; __f = false)

This allows you to write:

void f() {

    with (Lock l(&m)) {


This creates a clear association between the RAII object and the statements which depend on its existence. The code is less likely to be misunderstood.

If you’re familiar with Python, you’ll recognize this as analogous to Python’s with-statement.

Any kind of variable declaration can go in the head of the with-statement (as long as it can appear in the head of a for-statement). The body of the with-statement executes once. The variable declared in the head of the statement is destroyed after the body executes.

I didn’t invent this kind of MACRO. (I think I first read about something similar in a Dr Dobb’s article.) I just find it really useful, and I hope you do too.

The Canadian, Day 5

Today I woke up on the outskirts of Greater Vancouver, judging by the signs in this industrial area. The steward has just announced we’ll be arriving in Vancouver in one hour.

Thus concludes my journey. Though the journey spanned five calendar days, I left late on Thursday night and I’m arriving early Monday morning, so it’s more like four nights and three days. (A total travelling time of 3 days and 14.5 hours.) Because I travelled over a weekend, I only lost one day of office time and gained a scenic weekend.

The trip roughly breaks down to one day in the forests of Ontario, one day across the plains of Manitoba and Saskatchewan, and one day across the mountains of Alberta and British Columbia.

In retrospect, I should have done my work on the second day, when my mobile internet connection was good and the scenery was less interesting. (Sorry, Manitoba. Sorry, Saskatchewan.)

From here I take a bus to Whistler to attend what Mozilla calls a “work week” — a collection of presentations, team meetings, and planning sessions. It ends with a party on Friday night, the theme of which is “lumberjack”. (Between the bears and the hipsters, don’t I already get enough of people dressing like lumberjacks back in Toronto?)

Because I’m a giant hypocrite, I’ll be flying back to Toronto. But I heartily recommend travel by Via Rail. Their rail passes (good for visiting multiple destinations, or doing a round trip) are an especially good deal.

I wonder what Kylie Minogue has to say about rail travel.

The Canadian, Day 4

The great thing about travelling by train is that there is almost zero environmental impact.

Before you say “but what about those giant diesel engines burning diesel”, let me explain that I’m talking about marginal impact. That is, this train was going to be running regardless of whether I was on it or not. By choosing to be on it, I’m not contributing any additional environmental impact.

That’s not true for a bus or plane. If 100 people suddenly decided to travel from Toronto to Vancouver by bus, the bus company would have to schedule another couple busses. If 100 extra people decided to travel by plane, the airline would have to schedule another plane. But if 100 people decided to all take the train, Via Rail can simply add another couple of cars to their existing scheduled train, with negligible environmental impact.

(Caveat: There are reports that Via Rail no longer does this, and Elizabeth May is not happy about it. See Point 1 in her letter.)

There are downsides too. It’s more expensive than travelling by plane, though still within my company’s travel policy. (Note that I’m travelling in Economy. Note also that if you’re a member of CAA or Hostelling International, you get 10% off Via Rail tickets.) It also takes more time, but it’s not unproductive time. You can get quite a lot done on the train.

The main downside is sleeping in a seat. I was fine for the first couple nights, but after that third night (last night), I’m starting to feel a bit rough. And I have one more night to go.

The cost of the Via Rail ticket includes one stopover in any city for as long as you want. If I had more time, I might have scheduled a stopover in Winnipeg or Jasper for a couple nights to recharge.

Update: Jasper
Apparently I slept past Saskatoon and Edmonton.

Jasper is beautiful, but you already knew that.

Update: Approaching Kamloops
I can’t help wishing I was seeing this scenery in winter instead of summer. Green mountains just look like big hills.

We’re back on tracks laid by the Canadian Northern Railway. It still boggles my mind that we’re following a path chosen by someone 100 years ago. I spend so much of my life surrounded by new technology, it’s strange to be using something created even just 3 or 4 generations ago.

The 1950s and 1960s saw the decline of passenger rail in Canada. It couldn’t compete with the rise of air travel and new highways like the Trans-Canada and the 401. The federal government created Via Rail in the 1970s to take over passenger operations from CN and CP, since those services were no longer profitable.

I’m not exactly sure why the government keeps Via Rail running, but I’m glad they do. Last time I travelled by air, security confiscated my penknife.

Musical Interlude IV
[This one would have made more sense last night. I might swap them in a later edit.]

The Canadian, Day 3

I expected to wake up in Winnipeg, but instead we’re stopped in the middle of nowhere. I can tell we’re in Manitoba, because the landscape has become flat and grassy instead of Ontario’s rocky forests and lakes, but I don’t see Winnipeg anywhere. Still no internet connection.

The train is moving again. We just passed a farm that seems to be raising cows and abandoned trucks.

Update: Winnipeg

Our train has a layover of about 3 hours in Winnipeg. The Via Rail station is located beside The Forks, a historic part of Winnipeg of significance to First Nations people. This site has been used as a meeting place for at least 6000 years. It’s especially active today because today is Aboriginal Day.

The site also hosts the Canadian Museum of Human Rights (which was still under construction last time I was here), a farmer’s market that is open today, and a couple historic rail cars. A pedestrian bridge (the Esplanade Riel) links it to Winnipeg’s French quarter, St Boniface, across the river. (Until 1971, St Boniface was its own predominantly-francophone city, a rarity in Western Canada.)

I didn’t spend much time looking about, however. I went straight to the Assiniboine Athletic Club, just two short blocks from the Via Rail station’s main entrance, to take a shower. This is the only opportunity to shower between Toronto and Vancouver. It’s $11 for a day pass to the gym. I would have had a workout too, but I didn’t pack any shorts.

Former rail car of the Temiskaming and Northern Ontario Railway

The rail car in the above picture used to belong to the Temiskaming and Northern Ontario Railway, later known as the Ontario Northland Railway. Owned by the Ontario government, it’s one of the few railways in Canada which isn’t privately owned. Unfortunately, the Ontario government shut down ONR’s passenger services last year. It now only provides freight service and occasional tourist service.

Update: Somewhere in Manitoba

Manitoba is more scenic than you’d think. We’re currently in a rather pleasant-looking valley.

We’re now on tracks that were built by Grand Trunk Pacific. These tracks go from Winnipeg to Prince Rupert in northern BC. Together, Grand Trunk Pacific (which operated west of Winnipeg) and National Transcontinental Railway (which operated east of Winnipeg) were the third and final transcontinental rail route across Canada.

Like most Canadian railways, they eventually went bankrupt and were nationalized by the Canadian government, becoming part of the government-owned Canadian National Railway. The only major railway to escape this fate was Canadian Pacific Railway, leading to today’s situation where CNR and CPR (usually now called CN and CP) dominate Canada’s rail industry as a duopoly. CN was privatized in 1995. Apparently the largest shareholder is now Bill Gates.

The GTP tracks are still well used. Prince Rupert is a popular port for shipments from China. Due to the shape of the Earth, Prince Rupert is closer to China than Vancouver is. It’s easier to see on a globe.

Musical Interlude III