If we hit 100 before my talk tomorrow, I will add a mention of that Gem to the presentation (how about that for motivation).

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For example, if I wish to link to http://onestepback.org on a wiki page, then I must spell the link as HTTP://onestepback.org. Otherwise the updated page will be rejected.

Since the wiki spammers currently use lower case for "http", their page updates are rejected. Now this will only work until the spammer catch on and start uppercasing the HTTP. As long as the number of sites that enforce this rule is small, it should be a while before they catch on (one hopes).

Since I have implemented this patch a week ago, I have had only one instance of spamming. Yes, the spammer used an upper case HTTP. I don’t know if that particular spammer always uses upper case, or just responded intelligently to my error message. But that hasn’t been repeated. Like I say, I’m cautiosly optimistic.

You can find the patch here:

• http://onestepback.org/packages/usemod_antispam.patch

The patch was created against version 1.0 of UseMod wiki.

By posting this, I’ve (probably) increased the number of sites using this anti-spam technique and have brought the day closer to when the spammers figure it out. Oh, well. We will worry about that when it happens.

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One of the most important lessons I have ever learned as a software developer is to keep things simple. It’s also one of the hardest lessons to remember, because as programmers, we revel in the complex. Sometimes I am forced to reconsider designs where I let my love of complexity override my good sense for simplicity.

Revisiting Builder

However, as I was using, I discovered a rather annoying feature. If you recall, builders depended on the method_missing feature of Ruby to implement arbitrary XML tags on the fly. But, in order for code like this …

   builder.p { em("Hello World") }

to work, the em message must be sent to the builder object. Normally unadorned messages are sent to self. However, the builder object evaluated its block in a special way to hijack the value of self to point to itself.

It is really cool that we just need to mention the tag name and it automatically gets generated. But there is a downside. Suppose we replace the literal "Hello World" with a method called greet that dynamically determines the proper form of greeting. Now the code looks like this…

  builder.p { em(greet) }   # greet is a method

Now, not only em, but also greet gets sent to the builder. This is wrong, greet is a method defined on the current object, not the builder. To get around this, we must save the value of self outside the block and make it available under a different name. Perhaps like this…

  s = self
  builder.p { em(s.greet) }

As I was using builder I notice I was doing the s = self step on almost everytime I used a builder. And when I forget to use the s, I would get weird bugs in my HTML output.

Clearly I was being too clever (in my defense, I just copied the Groovy design for their builders). So I fixed the builder to use normal blocks with normal evaluation and the number of accidental bugs went way down. The greet example now reads like this under the new version of builder:

  builder.p { builder.em(greet) }

Now, since is it awkward to keep mentioning the builder name over and over, it would be nice to have a shortcut. Hence builders pass themselves as a parameter to the blocks. This gives us the opportunity to use a shorter name, but only with in the block. Again, the greet example is

  builder.p { |xml|  xml.em(greet) }

(The shorter name isn’t a big advantage here, but is a big convenience when many tags are created.)

So, it gets back to that old adage: KISS — Keep It Simple Stupid!

Postscript …

Builder is availble as a gem. Version 1.0.0 has the new, simpler interface. Because Builder is a gem, you can install both versions and use either, as long as you don’t mix their usage in a single application. To use the new version (after installing), just say

  require_gem 'builder', '~> 1.0'

This allows you to use any version greater than 1.0 but less that 2.0. To use the old interface, say …

  require_gem 'builder', '~> 0.1'

This allows any version 0.1 or later, but rejects version 1.0 and up. The ~> operator is called the Pessimistic version constraint is is helpful when versions of software have incompatible interfaces. The RubyGems wiki has more information about pessimistic version constraint and about versioning policies.

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Builder Objects

Sometimes you get good ideas from other languages.

The basic idea is that you create a builder object and then send it messages. It responds to the messages by building up a data structure based on those messages.

Ack, it’s easy to see it in action than to describe it. For example, the following code …

  builder = Builder::XmlMarkup.new("", 2)
  puts builder.person {
    name("jim")
    phone("555-1234", "local"=>"yes")
    address("Cincinnati")
  }

will print …

  <person>
    <name>jim</name>
    <phone local="yes">555-1234</phone>
    <address>Cincinnati</address>
  </person>

So, an XML Markup object produces XML markup. Not very surprising until you think about the methods send to the builder. Where is the person method defined? Or the name method?

Actually, they are not defined anywhere. Instead we have defined a generic method_missing method and handles any undefined method and adds the name of the method to the XML markup we are building. In addition we use code blocks to capture the nested nature of the XML. The result is a very natural way to programmatically generate XML markup.

And it goes beyond just markup. If you use Bulder::XmlEvents instead of Builder::XmlMarkup, the same syntax will generate SAX-like events instead of markup. Or you can use a DOM builder to generate a DOM object tree (I haven’t implemented the DOM version, but it should be straightforward).

There are a couple of "gotchas" with this approach that you should be aware of …

• Within the builder code blocks, any method call with an implicit object target needs to be sent to our builder. To achieve this, the code blocks are evaluated with instance_eval which changes the value of self to be the builder. This is OK until you want to call a method in the calling object. Since self is no longer the calling object, you have to explicitly provide the caller. Builders make this easy by setting the +@self+ instance variable to the caller.
• What happens when you need an XML tag that has the same name as an existing method name (e.g. id )? The builder objects handle this by inheriting from BlankSlate. In addition, all the implementation methods in a builder begin with an underscore, which makes them unlikely candidates for XML tags.

Because Builder objects lack the normal methods that most objects have makes working with them rather interesting. Consider the following irb session where we create a builder object and let irb try to display it (by sending it an inspect message):

    >> x = Builder::XmlMarkup.new
    => <inspect/>
    >> x
    => <inspect/><inspect/>
    >> x.to_s
    => "<inspect/><inspect/><to_s/>"
    >> x.methods
    => "<inspect/><inspect/><to_s/><methods/>"
    >> x + 5
    => "<inspect/><inspect/><to_s/><methods/><+>5</+>"
    >> x
    => <inspect/><inspect/><to_s/><methods/><+>5</+><inspect/>

Every time we send a message to the builder it records the name of the message. In a way, the builder has become a trace object, recording all the messages send to it. Weird.

Finally, consider this last example. Suppose we have a method that uses a builder to generate an RSS feed. Here is the method in part ..

  def generate_rss(builder, a_title, a_link, items)
    builder.rss("version" => "0.91") {
      channel {
        title a_title
        link  a_link
        # ... code missing ...
        items.each do |it|
          item {
           title it.title
           link  it.link
           description it.description
          }
        end
      }
    }
  end

Now a single method (generate_rss) can generate XML markup text, a DOM tree or a series of SAX events, all depending on what kind of builder object you pass to the function. That’s slightly cool.

As I mentioned, I got this idea from the Groovy language. Groovy has some other builders as well. For example there is an Ant task builder that integrates with ant. It is a very flexible technique that really shows off the power of a dynamic language.

Note: You can find the Builder object code in the RubyGem builder-0.1.1.gem available on the RubyGem server on RubyForge.

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This is the first hand-built RSS feed I’ve put together, so let me know if I’ve screwed something up.

By the way, the idea from the feed came from the Dave's Article at the Pragmatic Automation web site

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A couple of themes emerged from the conference. Aspect Oriented Programming may finally be coming of age. I first heard of AOP about 4 years ago. This year, there seemed to be more substance behind the buzz. We shall see.

Another theme was the the strong belief among the speakers that although Groovy is still very much in its infancy, it has a strong possibility become very significant in the next few years. If you haven’t heard of Groovy, it is a dynamic scripting language built on top of the JVM. Unlike other JVM languages such as Jython and JRuby, Groovy is designed to work closely with Java and especially the Java libraries. A brief look at Groovy reveals a lot of similarities with Ruby. I’ll be looking at Groovy in more detail.

I’ve got a couple ideas for blog entries inspired by the conference and I’ll post them here in time.

The program agenda is looking pretty good. I’m talking about RubyGems this year (what else!). I’m especially excited to see that David Heinemeier Hansson will be there and he will be talking about Ruby on Rails which has been getting a lot of air time recently.

The Conference is relatively inexpensive (only $200 for the conference fees) and it’s a great time to meet a lot of Rubyists all at once. The conference is in the Washington DC area (Chantilly, VA), so it is accessible to a large portion of the east coast.

If you are at all interested in Ruby, I urge to to come and meet with us! You can register here.

Update!

It has just been announced that Brad Cox, the inventor of Objective-C will be giving the Keynote speech at the conference.

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It turns out that she is featured on the local school district's web site where she is a library aide. The picture was taken during one of the school’s book promotions. (Helen is the one dressed up as the Cat-in-the-Hat.)

Here’s the picture …

Blocks in Ruby may be written with brace delimeters or do/end delimiters. There is a subtle difference in precedence between the two versions, but for most work the two are identical.

So which way do you go?

Some folk use { } for one-liners and do/end for multi-liners. Others stick exclusively to either { } or do/end. I tried all of the above, but was never really satisified with any of the guidelines.

Here is the guideline I use now:

• Use { } for blocks that return values
• Use do / end for blocks that are executed for side effects

This has the advantage of using the choice of block delimiter to convey a little extra information. Here’s some examples.

  # block used only for side effect
  list.each do |item| puts item end

  # Block used to return test value
  list.find { |item| item > 10 }

  # Block value used to build new value
  list.collect { |item| "-r" + item  }

Of course, if precedenence makes a difference, use the type of block that makes sense. This is just a guideline after all.

But I have found the distinction to be useful.

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I really like the book. I’m a big believer in automating all that I can, that is part of the motivation behind the creation of Rake. Mike provides a lot of great ideas and I can’t wait to try them out. (BTW, Rake gets a footnote mention on page 40, Woo Hoo!).

The book is targeted at the mainstream Java audience, so it talks a lot about ant and Cruise Control. Ruby and non-Java scripting languages are mentioned only in passing, but this is reasonable given the size and scope of the book. Mike says that he wants to encourage non-Java scripting and that the www.pragmaticautomation.com website will feature Ruby whenever he can.

And true to his word, today he posted a stakeout script that runs his unit tests whenever a file changes. Check it out.

Oh, and check out the book too.

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