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div.posts! do div.entry do p.date Time.now.to_s p.content "Test entry 1" end div.entry do p.date Time.now.to_s p.content "Test entry 2" end end <div id="posts"><div class="entry"><p class="date">Mon Oct 16 02:48:06 +0100 2006</ p><p class="content">Test entry 1</p></div><div class="entry"><p class="date">Mon Oct 16 02:48:06 +0100 2006</p><p class="content">Test entry 2</p></div></div> In this case, a parent div element is created with the ID of "posts". Child divs with the class name "entry" are created, containing paragraphs with the class names "date" and "content". It s important to note that the HTML generated by Markaby is not necessarily strictly valid HTML. Using tags and structure correctly is your responsibility as a developer.
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Note To learn more about Markaby, refer to the official Markaby homepage and documentation at
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http://markaby.rubyforge.org/.
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RedCloth is a library that provides a Ruby implementation of the Textile markup language. The Textile markup language is a special way of formatting plain text to be converted into HTML. Here s a demonstration of Textile, followed by the HTML that a Textile interpreter would generate from it: h1. This is a heading. This is the first paragraph. This is the second paragraph. h1. Another heading h2. A second level heading Another paragraph
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<h1>This is a heading.</h1> <p>This is the first paragraph.</p> <p>This is the second paragraph.</p> <h1>Another heading</h1> <h2>A second level heading</h2> <p>Another paragraph</p> Textile provides a more human-friendly language that can be converted easily to HTML. RedCloth makes this functionality available in Ruby. RedCloth is available as a RubyGem and can be installed in the usual way (such as with gem install RedCloth); see 7 for more information on installing gems. To use RedCloth, create an instance of the RedCloth class and pass in the Textile code you want to use: require 'rubygems' require 'redcloth' text = %q{h1. This is a heading. This is the first paragraph. This is the second paragraph. h1. Another heading h2. A second level heading Another paragraph} document = RedCloth.new(text) puts document.to_html The RedCloth class is a basic extension of the String class, so you can use regular string methods with RedCloth objects, or you can use the to_html method to convert the RedCloth/Textile document to HTML. The Textile language is a powerful markup language, but its syntax is beyond the scope of this chapter. It supports easy ways to convert plain text to complex HTML containing tables, HTML entities, images, and structural elements. To learn more about RedCloth and Textile, refer to the official RedCloth web site, at http://redcloth.rubyforge.org/.
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Note BlueCloth is another markup library for Ruby that exists as a gem. You can learn more about its
operation in 17, or at the official BlueCloth web site, at http://www.deveiate.org/projects/
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Processing Web Content
As you saw earlier, retrieving data from the Web is a snap with Ruby. Once you ve retrieved the data, it s likely you ll want to do something with it. Parsing data from the Web using regular expressions and the usual Ruby string methods is an option, but several libraries exist that make it easier to deal with different forms of web content specifically. In this section, we ll look at some of the best ways to process HTML and XML (including feed formats such as RSS and Atom).
parsing htML with hpricot
In previous sections, we used Markaby and RedCloth to generate HTML from Ruby code and data. In this section, we ll look at doing the reverse by taking HTML code and extracting data from it in a structured fashion. Hpricot is a Ruby library by why the lucky stiff designed to make HTML parsing fast, easy, and fun. It s available as a RubyGem via gem install hpricot. Though it relies on a compiled extension written in C for its speed, a special Windows build is available via RubyGems with a precompiled extension. Once installed, Hpricot is easy to use. The following example loads the Hpricot library, places some basic HTML in a string, creates the Hpricot object, and then searches for H1 tags (using search). It then retrieves the first (using first, as search returns an array) and looks at the HTML within it (using inner_html): require 'rubygems' require 'hpricot' html = <<END_OF_HTML <html> <head> <title>This is the page title</title> </head> <body> <h1>Big heading!</h1> <p>A paragraph of text.</p> <ul><li>Item 1 in a list</li><li>Item 2</li><li class="highlighted">Item 3</li></ul> </body> </html> END_OF_HTML doc = Hpricot(html) puts doc.search("h1").first.inner_html
Big heading!
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