It is a non-trivial problem to parse such a document into a structured format like XML , since XML parsers can work with well-formed documents only. After preprocessing the page content with HTree, we have to unleash the full power of XPath, which is a very powerful XML document querying language, highly suitable for web extraction. The powerful web scrapping tools in Ruby are mainly Mechanize and Hpricot. Mechanize has the ability to automatically navigate through Web pages as a result of interaction filling forms etc.
Ruby Leave a Comment. It was designed to address concerns users of that library had and it has three primary goals:. Ruby , Ruby on Rails 5 Comments. I do not know, use, or have an opinion on the Ruby language yet. But since this language climbed up to the 13th place in the Tiobe index, it deserves to be taken seriously. Bruce Tate is a well know proponent of Ruby. If we want Java keep evolving, we need to look around.
Why this year old language was not known in the programming community until the Ruby on Rails came about? This does not always coincide with the emergence of the catalyst.
At some point, we decide that we know all there is to know about a language, and then nothing can really help it. Ruby is a little strange for two reasons: Right now, the whole Ruby community—book sales, education, components—everything is wrapped up in Ruby on Rails. Other languages have better web development experiences—Seaside on Smalltalk, for example.
But Rails has traction, and the combination of productivity in a clean language with good market share is tough to beat. Specifically, Ruby is a great language for metaprogramming. Think domain specific languages, open classes, templates, etc. A few things that I notice about Ruby are:. Dependency injection happens, but not through a framework. You can redefine an object or class to do method injection trivially.
The concept is called open classes in Ruby. This capability makes testing much easier than it is in Java.
For example, you can have a template with variable substitution, and append that text as code to a class. This capability makes application generators almost trivial. But you can extend this scaffolding to build a surprisingly complete application, given a powerful enough metamodel.
The streamlined project does exactly this. Ruby uses the language itself to handle crosscutting concerns. Just open up the class and add interceptors in the places you need them with a handful of code. So Ruby is a fantastic applications language. The latency, as always, is in the database. But all of this flexibility comes at a cost. Enterprise programming distributed 2pc, hard core orm will take some time, and more investment than you see at this point.
Right now, Ruby is a great applications language. Imagine, that you have the right to add five Ruby language elements to the next version of Java. What would they be?
Can you include quick code samples as well? Closures give you the ability to pass a code block as a parameter. I can use a closure to print something 10 times:. Other times, I want to customize the inside of a block of code. For example, when you deal with a file, you must make sure you handle exceptions, and clean up resources, leading to a repetitive ugly block of code.
But with closures, you can do something like this:. The open method can take care of all of the repetitive details for you. Closures help whenever you want to deal with blocks of something. Closures are a huge win for Ruby, and the design pattern is actually used frequently in Java within frameworks like Spring.
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